1/* ssl/s3_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) 1998-2002 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#define REUSE_CIPHER_BUG
113#define NETSCAPE_HANG_BUG
114
115
116#include <stdio.h>
117#include <openssl/buffer.h>
118#include <openssl/rand.h>
119#include <openssl/objects.h>
120#include <openssl/md5.h>
121#include <openssl/sha.h>
122#include <openssl/evp.h>
123#include <openssl/x509.h>
124#include "ssl_locl.h"
125#include "cryptlib.h"
126
127static SSL_METHOD *ssl3_get_server_method(int ver);
128static int ssl3_get_client_hello(SSL *s);
129static int ssl3_check_client_hello(SSL *s);
130static int ssl3_send_server_hello(SSL *s);
131static int ssl3_send_server_key_exchange(SSL *s);
132static int ssl3_send_certificate_request(SSL *s);
133static int ssl3_send_server_done(SSL *s);
134static int ssl3_get_client_key_exchange(SSL *s);
135static int ssl3_get_client_certificate(SSL *s);
136static int ssl3_get_cert_verify(SSL *s);
137static int ssl3_send_hello_request(SSL *s);
138
139static SSL_METHOD *ssl3_get_server_method(int ver)
140 {
141 if (ver == SSL3_VERSION)
142 return(SSLv3_server_method());
143 else
144 return(NULL);
145 }
146
147SSL_METHOD *SSLv3_server_method(void)
148 {
149 static int init=1;
150 static SSL_METHOD SSLv3_server_data;
151
152 if (init)
153 {
154 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
155 sizeof(SSL_METHOD));
156 SSLv3_server_data.ssl_accept=ssl3_accept;
157 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
158 init=0;
159 }
160 return(&SSLv3_server_data);
161 }
162
163int ssl3_accept(SSL *s)
164 {
165 BUF_MEM *buf;
166 unsigned long l,Time=time(NULL);
167 void (*cb)()=NULL;
168 long num1;
169 int ret= -1;
170 int new_state,state,skip=0;
171
172 RAND_add(&Time,sizeof(Time),0);
173 ERR_clear_error();
174 clear_sys_error();
175
176 if (s->info_callback != NULL)
177 cb=s->info_callback;
178 else if (s->ctx->info_callback != NULL)
179 cb=s->ctx->info_callback;
180
181 /* init things to blank */
182 s->in_handshake++;
183 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
184
185 if (s->cert == NULL)
186 {
187 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
188 return(-1);
189 }
190
191 for (;;)
192 {
193 state=s->state;
194
195 switch (s->state)
196 {
197 case SSL_ST_RENEGOTIATE:
198 s->new_session=1;
199 /* s->state=SSL_ST_ACCEPT; */
200
201 case SSL_ST_BEFORE:
202 case SSL_ST_ACCEPT:
203 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
204 case SSL_ST_OK|SSL_ST_ACCEPT:
205
206 s->server=1;
207 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
208
209 if ((s->version>>8) != 3)
210 {
211 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_INTERNAL_ERROR);
212 return -1;
213 }
214 s->type=SSL_ST_ACCEPT;
215
216 if (s->init_buf == NULL)
217 {
218 if ((buf=BUF_MEM_new()) == NULL)
219 {
220 ret= -1;
221 goto end;
222 }
223 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
224 {
225 ret= -1;
226 goto end;
227 }
228 s->init_buf=buf;
229 }
230
231 if (!ssl3_setup_buffers(s))
232 {
233 ret= -1;
234 goto end;
235 }
236
237 s->init_num=0;
238
239 if (s->state != SSL_ST_RENEGOTIATE)
240 {
241 /* Ok, we now need to push on a buffering BIO so that
242 * the output is sent in a way that TCP likes :-)
243 */
244 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
245
246 ssl3_init_finished_mac(s);
247 s->state=SSL3_ST_SR_CLNT_HELLO_A;
248 s->ctx->stats.sess_accept++;
249 }
250 else
251 {
252 /* s->state == SSL_ST_RENEGOTIATE,
253 * we will just send a HelloRequest */
254 s->ctx->stats.sess_accept_renegotiate++;
255 s->state=SSL3_ST_SW_HELLO_REQ_A;
256 }
257 break;
258
259 case SSL3_ST_SW_HELLO_REQ_A:
260 case SSL3_ST_SW_HELLO_REQ_B:
261
262 s->shutdown=0;
263 ret=ssl3_send_hello_request(s);
264 if (ret <= 0) goto end;
265 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
266 s->state=SSL3_ST_SW_FLUSH;
267 s->init_num=0;
268
269 ssl3_init_finished_mac(s);
270 break;
271
272 case SSL3_ST_SW_HELLO_REQ_C:
273 s->state=SSL_ST_OK;
274 break;
275
276 case SSL3_ST_SR_CLNT_HELLO_A:
277 case SSL3_ST_SR_CLNT_HELLO_B:
278 case SSL3_ST_SR_CLNT_HELLO_C:
279
280 s->shutdown=0;
281 ret=ssl3_get_client_hello(s);
282 if (ret <= 0) goto end;
283 s->new_session = 2;
284 s->state=SSL3_ST_SW_SRVR_HELLO_A;
285 s->init_num=0;
286 break;
287
288 case SSL3_ST_SW_SRVR_HELLO_A:
289 case SSL3_ST_SW_SRVR_HELLO_B:
290 ret=ssl3_send_server_hello(s);
291 if (ret <= 0) goto end;
292
293 if (s->hit)
294 s->state=SSL3_ST_SW_CHANGE_A;
295 else
296 s->state=SSL3_ST_SW_CERT_A;
297 s->init_num=0;
298 break;
299
300 case SSL3_ST_SW_CERT_A:
301 case SSL3_ST_SW_CERT_B:
302 /* Check if it is anon DH */
303 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
304 {
305 ret=ssl3_send_server_certificate(s);
306 if (ret <= 0) goto end;
307 }
308 else
309 skip=1;
310 s->state=SSL3_ST_SW_KEY_EXCH_A;
311 s->init_num=0;
312 break;
313
314 case SSL3_ST_SW_KEY_EXCH_A:
315 case SSL3_ST_SW_KEY_EXCH_B:
316 l=s->s3->tmp.new_cipher->algorithms;
317
318 /* clear this, it may get reset by
319 * send_server_key_exchange */
320 if (s->options & SSL_OP_EPHEMERAL_RSA)
321 s->s3->tmp.use_rsa_tmp=1;
322 else
323 s->s3->tmp.use_rsa_tmp=0;
324
325 /* only send if a DH key exchange, fortezza or
326 * RSA but we have a sign only certificate */
327 if (s->s3->tmp.use_rsa_tmp
328 || (l & (SSL_DH|SSL_kFZA))
329 || ((l & SSL_kRSA)
330 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
331 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
332 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
333 )
334 )
335 )
336 )
337 {
338 ret=ssl3_send_server_key_exchange(s);
339 if (ret <= 0) goto end;
340 }
341 else
342 skip=1;
343
344 s->state=SSL3_ST_SW_CERT_REQ_A;
345 s->init_num=0;
346 break;
347
348 case SSL3_ST_SW_CERT_REQ_A:
349 case SSL3_ST_SW_CERT_REQ_B:
350 if (/* don't request cert unless asked for it: */
351 !(s->verify_mode & SSL_VERIFY_PEER) ||
352 /* if SSL_VERIFY_CLIENT_ONCE is set,
353 * don't request cert during re-negotiation: */
354 ((s->session->peer != NULL) &&
355 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
356 /* never request cert in anonymous ciphersuites
357 * (see section "Certificate request" in SSL 3 drafts
358 * and in RFC 2246): */
359 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
360 /* ... except when the application insists on verification
361 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
362 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
363 {
364 /* no cert request */
365 skip=1;
366 s->s3->tmp.cert_request=0;
367 s->state=SSL3_ST_SW_SRVR_DONE_A;
368 }
369 else
370 {
371 s->s3->tmp.cert_request=1;
372 ret=ssl3_send_certificate_request(s);
373 if (ret <= 0) goto end;
374#ifndef NETSCAPE_HANG_BUG
375 s->state=SSL3_ST_SW_SRVR_DONE_A;
376#else
377 s->state=SSL3_ST_SW_FLUSH;
378 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
379#endif
380 s->init_num=0;
381 }
382 break;
383
384 case SSL3_ST_SW_SRVR_DONE_A:
385 case SSL3_ST_SW_SRVR_DONE_B:
386 ret=ssl3_send_server_done(s);
387 if (ret <= 0) goto end;
388 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
389 s->state=SSL3_ST_SW_FLUSH;
390 s->init_num=0;
391 break;
392
393 case SSL3_ST_SW_FLUSH:
394 /* number of bytes to be flushed */
395 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
396 if (num1 > 0)
397 {
398 s->rwstate=SSL_WRITING;
399 num1=BIO_flush(s->wbio);
400 if (num1 <= 0) { ret= -1; goto end; }
401 s->rwstate=SSL_NOTHING;
402 }
403
404 s->state=s->s3->tmp.next_state;
405 break;
406
407 case SSL3_ST_SR_CERT_A:
408 case SSL3_ST_SR_CERT_B:
409 /* Check for second client hello (MS SGC) */
410 ret = ssl3_check_client_hello(s);
411 if (ret <= 0)
412 goto end;
413 if (ret == 2)
414 s->state = SSL3_ST_SR_CLNT_HELLO_C;
415 else {
416 /* could be sent for a DH cert, even if we
417 * have not asked for it :-) */
418 ret=ssl3_get_client_certificate(s);
419 if (ret <= 0) goto end;
420 s->init_num=0;
421 s->state=SSL3_ST_SR_KEY_EXCH_A;
422 }
423 break;
424
425 case SSL3_ST_SR_KEY_EXCH_A:
426 case SSL3_ST_SR_KEY_EXCH_B:
427 ret=ssl3_get_client_key_exchange(s);
428 if (ret <= 0) goto end;
429 s->state=SSL3_ST_SR_CERT_VRFY_A;
430 s->init_num=0;
431
432 /* We need to get hashes here so if there is
433 * a client cert, it can be verified */
434 s->method->ssl3_enc->cert_verify_mac(s,
435 &(s->s3->finish_dgst1),
436 &(s->s3->tmp.cert_verify_md[0]));
437 s->method->ssl3_enc->cert_verify_mac(s,
438 &(s->s3->finish_dgst2),
439 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
440
441 break;
442
443 case SSL3_ST_SR_CERT_VRFY_A:
444 case SSL3_ST_SR_CERT_VRFY_B:
445
446 /* we should decide if we expected this one */
447 ret=ssl3_get_cert_verify(s);
448 if (ret <= 0) goto end;
449
450 s->state=SSL3_ST_SR_FINISHED_A;
451 s->init_num=0;
452 break;
453
454 case SSL3_ST_SR_FINISHED_A:
455 case SSL3_ST_SR_FINISHED_B:
456 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
457 SSL3_ST_SR_FINISHED_B);
458 if (ret <= 0) goto end;
459 if (s->hit)
460 s->state=SSL_ST_OK;
461 else
462 s->state=SSL3_ST_SW_CHANGE_A;
463 s->init_num=0;
464 break;
465
466 case SSL3_ST_SW_CHANGE_A:
467 case SSL3_ST_SW_CHANGE_B:
468
469 s->session->cipher=s->s3->tmp.new_cipher;
470 if (!s->method->ssl3_enc->setup_key_block(s))
471 { ret= -1; goto end; }
472
473 ret=ssl3_send_change_cipher_spec(s,
474 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
475
476 if (ret <= 0) goto end;
477 s->state=SSL3_ST_SW_FINISHED_A;
478 s->init_num=0;
479
480 if (!s->method->ssl3_enc->change_cipher_state(s,
481 SSL3_CHANGE_CIPHER_SERVER_WRITE))
482 {
483 ret= -1;
484 goto end;
485 }
486
487 break;
488
489 case SSL3_ST_SW_FINISHED_A:
490 case SSL3_ST_SW_FINISHED_B:
491 ret=ssl3_send_finished(s,
492 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
493 s->method->ssl3_enc->server_finished_label,
494 s->method->ssl3_enc->server_finished_label_len);
495 if (ret <= 0) goto end;
496 s->state=SSL3_ST_SW_FLUSH;
497 if (s->hit)
498 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
499 else
500 s->s3->tmp.next_state=SSL_ST_OK;
501 s->init_num=0;
502 break;
503
504 case SSL_ST_OK:
505 /* clean a few things up */
506 ssl3_cleanup_key_block(s);
507
508 BUF_MEM_free(s->init_buf);
509 s->init_buf=NULL;
510
511 /* remove buffering on output */
512 ssl_free_wbio_buffer(s);
513
514 s->init_num=0;
515
516 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
517 {
518 /* actually not necessarily a 'new' session */
519
520 s->new_session=0;
521
522 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
523
524 s->ctx->stats.sess_accept_good++;
525 /* s->server=1; */
526 s->handshake_func=ssl3_accept;
527
528 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
529 }
530
531 ret = 1;
532 goto end;
533 /* break; */
534
535 default:
536 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
537 ret= -1;
538 goto end;
539 /* break; */
540 }
541
542 if (!s->s3->tmp.reuse_message && !skip)
543 {
544 if (s->debug)
545 {
546 if ((ret=BIO_flush(s->wbio)) <= 0)
547 goto end;
548 }
549
550
551 if ((cb != NULL) && (s->state != state))
552 {
553 new_state=s->state;
554 s->state=state;
555 cb(s,SSL_CB_ACCEPT_LOOP,1);
556 s->state=new_state;
557 }
558 }
559 skip=0;
560 }
561end:
562 /* BIO_flush(s->wbio); */
563
564 s->in_handshake--;
565 if (cb != NULL)
566 cb(s,SSL_CB_ACCEPT_EXIT,ret);
567 return(ret);
568 }
569
570static int ssl3_send_hello_request(SSL *s)
571 {
572 unsigned char *p;
573
574 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
575 {
576 p=(unsigned char *)s->init_buf->data;
577 *(p++)=SSL3_MT_HELLO_REQUEST;
578 *(p++)=0;
579 *(p++)=0;
580 *(p++)=0;
581
582 s->state=SSL3_ST_SW_HELLO_REQ_B;
583 /* number of bytes to write */
584 s->init_num=4;
585 s->init_off=0;
586 }
587
588 /* SSL3_ST_SW_HELLO_REQ_B */
589 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
590 }
591
592static int ssl3_check_client_hello(SSL *s)
593 {
594 int ok;
595 long n;
596
597 /* this function is called when we really expect a Certificate message,
598 * so permit appropriate message length */
599 n=ssl3_get_message(s,
600 SSL3_ST_SR_CERT_A,
601 SSL3_ST_SR_CERT_B,
602 -1,
603#if defined(MSDOS) && !defined(WIN32)
604 1024*30, /* 30k max cert list :-) */
605#else
606 1024*100, /* 100k max cert list :-) */
607#endif
608 &ok);
609 if (!ok) return((int)n);
610 s->s3->tmp.reuse_message = 1;
611 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
612 {
613 /* Throw away what we have done so far in the current handshake,
614 * which will now be aborted. (A full SSL_clear would be too much.)
615 * I hope that tmp.dh is the only thing that may need to be cleared
616 * when a handshake is not completed ... */
617#ifndef NO_DH
618 if (s->s3->tmp.dh != NULL)
619 {
620 DH_free(s->s3->tmp.dh);
621 s->s3->tmp.dh = NULL;
622 }
623#endif
624 return 2;
625 }
626 return 1;
627}
628
629static int ssl3_get_client_hello(SSL *s)
630 {
631 int i,j,ok,al,ret= -1;
632 long n;
633 unsigned long id;
634 unsigned char *p,*d,*q;
635 SSL_CIPHER *c;
636 SSL_COMP *comp=NULL;
637 STACK_OF(SSL_CIPHER) *ciphers=NULL;
638
639 /* We do this so that we will respond with our native type.
640 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
641 * This down switching should be handled by a different method.
642 * If we are SSLv3, we will respond with SSLv3, even if prompted with
643 * TLSv1.
644 */
645 if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
646 {
647 s->first_packet=1;
648 s->state=SSL3_ST_SR_CLNT_HELLO_B;
649 }
650 n=ssl3_get_message(s,
651 SSL3_ST_SR_CLNT_HELLO_B,
652 SSL3_ST_SR_CLNT_HELLO_C,
653 SSL3_MT_CLIENT_HELLO,
654 SSL3_RT_MAX_PLAIN_LENGTH,
655 &ok);
656
657 if (!ok) return((int)n);
658 d=p=(unsigned char *)s->init_buf->data;
659
660 /* use version from inside client hello, not from record header
661 * (may differ: see RFC 2246, Appendix E, second paragraph) */
662 s->client_version=(((int)p[0])<<8)|(int)p[1];
663 p+=2;
664
665 if (s->client_version < s->version)
666 {
667 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
668 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
669 {
670 /* similar to ssl3_get_record, send alert using remote version number */
671 s->version = s->client_version;
672 }
673 al = SSL_AD_PROTOCOL_VERSION;
674 goto f_err;
675 }
676
677 /* load the client random */
678 memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
679 p+=SSL3_RANDOM_SIZE;
680
681 /* get the session-id */
682 j= *(p++);
683
684 s->hit=0;
685 if (j == 0)
686 {
687 if (!ssl_get_new_session(s,1))
688 goto err;
689 }
690 else
691 {
692 i=ssl_get_prev_session(s,p,j);
693 if (i == 1)
694 { /* previous session */
695 s->hit=1;
696 }
697 else if (i == -1)
698 goto err;
699 else /* i == 0 */
700 {
701 if (!ssl_get_new_session(s,1))
702 goto err;
703 }
704 }
705
706 p+=j;
707 n2s(p,i);
708 if ((i == 0) && (j != 0))
709 {
710 /* we need a cipher if we are not resuming a session */
711 al=SSL_AD_ILLEGAL_PARAMETER;
712 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
713 goto f_err;
714 }
715 if ((p+i) >= (d+n))
716 {
717 /* not enough data */
718 al=SSL_AD_DECODE_ERROR;
719 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
720 goto f_err;
721 }
722 if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
723 == NULL))
724 {
725 goto err;
726 }
727 p+=i;
728
729 /* If it is a hit, check that the cipher is in the list */
730 if ((s->hit) && (i > 0))
731 {
732 j=0;
733 id=s->session->cipher->id;
734
735#ifdef CIPHER_DEBUG
736 printf("client sent %d ciphers\n",sk_num(ciphers));
737#endif
738 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
739 {
740 c=sk_SSL_CIPHER_value(ciphers,i);
741#ifdef CIPHER_DEBUG
742 printf("client [%2d of %2d]:%s\n",
743 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
744#endif
745 if (c->id == id)
746 {
747 j=1;
748 break;
749 }
750 }
751 if (j == 0)
752 {
753 if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
754 {
755 /* Very bad for multi-threading.... */
756 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
757 0);
758 }
759 else
760 {
761 /* we need to have the cipher in the cipher
762 * list if we are asked to reuse it */
763 al=SSL_AD_ILLEGAL_PARAMETER;
764 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
765 goto f_err;
766 }
767 }
768 }
769
770 /* compression */
771 i= *(p++);
772 if ((p+i) > (d+n))
773 {
774 /* not enough data */
775 al=SSL_AD_DECODE_ERROR;
776 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
777 goto f_err;
778 }
779 q=p;
780 for (j=0; j<i; j++)
781 {
782 if (p[j] == 0) break;
783 }
784
785 p+=i;
786 if (j >= i)
787 {
788 /* no compress */
789 al=SSL_AD_DECODE_ERROR;
790 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
791 goto f_err;
792 }
793
794 /* Worst case, we will use the NULL compression, but if we have other
795 * options, we will now look for them. We have i-1 compression
796 * algorithms from the client, starting at q. */
797 s->s3->tmp.new_compression=NULL;
798 if (s->ctx->comp_methods != NULL)
799 { /* See if we have a match */
800 int m,nn,o,v,done=0;
801
802 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
803 for (m=0; m<nn; m++)
804 {
805 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
806 v=comp->id;
807 for (o=0; o<i; o++)
808 {
809 if (v == q[o])
810 {
811 done=1;
812 break;
813 }
814 }
815 if (done) break;
816 }
817 if (done)
818 s->s3->tmp.new_compression=comp;
819 else
820 comp=NULL;
821 }
822
823 /* TLS does not mind if there is extra stuff */
824 if (s->version == SSL3_VERSION)
825 {
826 if (p < (d+n))
827 {
828 /* wrong number of bytes,
829 * there could be more to follow */
830 al=SSL_AD_DECODE_ERROR;
831 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
832 goto f_err;
833 }
834 }
835
836 /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
837 * pick a cipher */
838
839 if (!s->hit)
840 {
841 s->session->compress_meth=(comp == NULL)?0:comp->id;
842 if (s->session->ciphers != NULL)
843 sk_SSL_CIPHER_free(s->session->ciphers);
844 s->session->ciphers=ciphers;
845 if (ciphers == NULL)
846 {
847 al=SSL_AD_ILLEGAL_PARAMETER;
848 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
849 goto f_err;
850 }
851 ciphers=NULL;
852 c=ssl3_choose_cipher(s,s->session->ciphers,
853 ssl_get_ciphers_by_id(s));
854
855 if (c == NULL)
856 {
857 al=SSL_AD_HANDSHAKE_FAILURE;
858 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
859 goto f_err;
860 }
861 s->s3->tmp.new_cipher=c;
862 }
863 else
864 {
865 /* Session-id reuse */
866#ifdef REUSE_CIPHER_BUG
867 STACK_OF(SSL_CIPHER) *sk;
868 SSL_CIPHER *nc=NULL;
869 SSL_CIPHER *ec=NULL;
870
871 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
872 {
873 sk=s->session->ciphers;
874 for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
875 {
876 c=sk_SSL_CIPHER_value(sk,i);
877 if (c->algorithms & SSL_eNULL)
878 nc=c;
879 if (SSL_C_IS_EXPORT(c))
880 ec=c;
881 }
882 if (nc != NULL)
883 s->s3->tmp.new_cipher=nc;
884 else if (ec != NULL)
885 s->s3->tmp.new_cipher=ec;
886 else
887 s->s3->tmp.new_cipher=s->session->cipher;
888 }
889 else
890#endif
891 s->s3->tmp.new_cipher=s->session->cipher;
892 }
893
894 /* we now have the following setup.
895 * client_random
896 * cipher_list - our prefered list of ciphers
897 * ciphers - the clients prefered list of ciphers
898 * compression - basically ignored right now
899 * ssl version is set - sslv3
900 * s->session - The ssl session has been setup.
901 * s->hit - session reuse flag
902 * s->tmp.new_cipher - the new cipher to use.
903 */
904
905 ret=1;
906 if (0)
907 {
908f_err:
909 ssl3_send_alert(s,SSL3_AL_FATAL,al);
910 }
911err:
912 if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
913 return(ret);
914 }
915
916static int ssl3_send_server_hello(SSL *s)
917 {
918 unsigned char *buf;
919 unsigned char *p,*d;
920 int i,sl;
921 unsigned long l,Time;
922
923 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
924 {
925 buf=(unsigned char *)s->init_buf->data;
926 p=s->s3->server_random;
927 Time=time(NULL); /* Time */
928 l2n(Time,p);
929 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
930 /* Do the message type and length last */
931 d=p= &(buf[4]);
932
933 *(p++)=s->version>>8;
934 *(p++)=s->version&0xff;
935
936 /* Random stuff */
937 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
938 p+=SSL3_RANDOM_SIZE;
939
940 /* now in theory we have 3 options to sending back the
941 * session id. If it is a re-use, we send back the
942 * old session-id, if it is a new session, we send
943 * back the new session-id or we send back a 0 length
944 * session-id if we want it to be single use.
945 * Currently I will not implement the '0' length session-id
946 * 12-Jan-98 - I'll now support the '0' length stuff.
947 */
948 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
949 s->session->session_id_length=0;
950
951 sl=s->session->session_id_length;
| 1/* ssl/s3_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) 1998-2002 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#define REUSE_CIPHER_BUG
113#define NETSCAPE_HANG_BUG
114
115
116#include <stdio.h>
117#include <openssl/buffer.h>
118#include <openssl/rand.h>
119#include <openssl/objects.h>
120#include <openssl/md5.h>
121#include <openssl/sha.h>
122#include <openssl/evp.h>
123#include <openssl/x509.h>
124#include "ssl_locl.h"
125#include "cryptlib.h"
126
127static SSL_METHOD *ssl3_get_server_method(int ver);
128static int ssl3_get_client_hello(SSL *s);
129static int ssl3_check_client_hello(SSL *s);
130static int ssl3_send_server_hello(SSL *s);
131static int ssl3_send_server_key_exchange(SSL *s);
132static int ssl3_send_certificate_request(SSL *s);
133static int ssl3_send_server_done(SSL *s);
134static int ssl3_get_client_key_exchange(SSL *s);
135static int ssl3_get_client_certificate(SSL *s);
136static int ssl3_get_cert_verify(SSL *s);
137static int ssl3_send_hello_request(SSL *s);
138
139static SSL_METHOD *ssl3_get_server_method(int ver)
140 {
141 if (ver == SSL3_VERSION)
142 return(SSLv3_server_method());
143 else
144 return(NULL);
145 }
146
147SSL_METHOD *SSLv3_server_method(void)
148 {
149 static int init=1;
150 static SSL_METHOD SSLv3_server_data;
151
152 if (init)
153 {
154 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
155 sizeof(SSL_METHOD));
156 SSLv3_server_data.ssl_accept=ssl3_accept;
157 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
158 init=0;
159 }
160 return(&SSLv3_server_data);
161 }
162
163int ssl3_accept(SSL *s)
164 {
165 BUF_MEM *buf;
166 unsigned long l,Time=time(NULL);
167 void (*cb)()=NULL;
168 long num1;
169 int ret= -1;
170 int new_state,state,skip=0;
171
172 RAND_add(&Time,sizeof(Time),0);
173 ERR_clear_error();
174 clear_sys_error();
175
176 if (s->info_callback != NULL)
177 cb=s->info_callback;
178 else if (s->ctx->info_callback != NULL)
179 cb=s->ctx->info_callback;
180
181 /* init things to blank */
182 s->in_handshake++;
183 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
184
185 if (s->cert == NULL)
186 {
187 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
188 return(-1);
189 }
190
191 for (;;)
192 {
193 state=s->state;
194
195 switch (s->state)
196 {
197 case SSL_ST_RENEGOTIATE:
198 s->new_session=1;
199 /* s->state=SSL_ST_ACCEPT; */
200
201 case SSL_ST_BEFORE:
202 case SSL_ST_ACCEPT:
203 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
204 case SSL_ST_OK|SSL_ST_ACCEPT:
205
206 s->server=1;
207 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
208
209 if ((s->version>>8) != 3)
210 {
211 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_INTERNAL_ERROR);
212 return -1;
213 }
214 s->type=SSL_ST_ACCEPT;
215
216 if (s->init_buf == NULL)
217 {
218 if ((buf=BUF_MEM_new()) == NULL)
219 {
220 ret= -1;
221 goto end;
222 }
223 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
224 {
225 ret= -1;
226 goto end;
227 }
228 s->init_buf=buf;
229 }
230
231 if (!ssl3_setup_buffers(s))
232 {
233 ret= -1;
234 goto end;
235 }
236
237 s->init_num=0;
238
239 if (s->state != SSL_ST_RENEGOTIATE)
240 {
241 /* Ok, we now need to push on a buffering BIO so that
242 * the output is sent in a way that TCP likes :-)
243 */
244 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
245
246 ssl3_init_finished_mac(s);
247 s->state=SSL3_ST_SR_CLNT_HELLO_A;
248 s->ctx->stats.sess_accept++;
249 }
250 else
251 {
252 /* s->state == SSL_ST_RENEGOTIATE,
253 * we will just send a HelloRequest */
254 s->ctx->stats.sess_accept_renegotiate++;
255 s->state=SSL3_ST_SW_HELLO_REQ_A;
256 }
257 break;
258
259 case SSL3_ST_SW_HELLO_REQ_A:
260 case SSL3_ST_SW_HELLO_REQ_B:
261
262 s->shutdown=0;
263 ret=ssl3_send_hello_request(s);
264 if (ret <= 0) goto end;
265 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
266 s->state=SSL3_ST_SW_FLUSH;
267 s->init_num=0;
268
269 ssl3_init_finished_mac(s);
270 break;
271
272 case SSL3_ST_SW_HELLO_REQ_C:
273 s->state=SSL_ST_OK;
274 break;
275
276 case SSL3_ST_SR_CLNT_HELLO_A:
277 case SSL3_ST_SR_CLNT_HELLO_B:
278 case SSL3_ST_SR_CLNT_HELLO_C:
279
280 s->shutdown=0;
281 ret=ssl3_get_client_hello(s);
282 if (ret <= 0) goto end;
283 s->new_session = 2;
284 s->state=SSL3_ST_SW_SRVR_HELLO_A;
285 s->init_num=0;
286 break;
287
288 case SSL3_ST_SW_SRVR_HELLO_A:
289 case SSL3_ST_SW_SRVR_HELLO_B:
290 ret=ssl3_send_server_hello(s);
291 if (ret <= 0) goto end;
292
293 if (s->hit)
294 s->state=SSL3_ST_SW_CHANGE_A;
295 else
296 s->state=SSL3_ST_SW_CERT_A;
297 s->init_num=0;
298 break;
299
300 case SSL3_ST_SW_CERT_A:
301 case SSL3_ST_SW_CERT_B:
302 /* Check if it is anon DH */
303 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
304 {
305 ret=ssl3_send_server_certificate(s);
306 if (ret <= 0) goto end;
307 }
308 else
309 skip=1;
310 s->state=SSL3_ST_SW_KEY_EXCH_A;
311 s->init_num=0;
312 break;
313
314 case SSL3_ST_SW_KEY_EXCH_A:
315 case SSL3_ST_SW_KEY_EXCH_B:
316 l=s->s3->tmp.new_cipher->algorithms;
317
318 /* clear this, it may get reset by
319 * send_server_key_exchange */
320 if (s->options & SSL_OP_EPHEMERAL_RSA)
321 s->s3->tmp.use_rsa_tmp=1;
322 else
323 s->s3->tmp.use_rsa_tmp=0;
324
325 /* only send if a DH key exchange, fortezza or
326 * RSA but we have a sign only certificate */
327 if (s->s3->tmp.use_rsa_tmp
328 || (l & (SSL_DH|SSL_kFZA))
329 || ((l & SSL_kRSA)
330 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
331 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
332 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
333 )
334 )
335 )
336 )
337 {
338 ret=ssl3_send_server_key_exchange(s);
339 if (ret <= 0) goto end;
340 }
341 else
342 skip=1;
343
344 s->state=SSL3_ST_SW_CERT_REQ_A;
345 s->init_num=0;
346 break;
347
348 case SSL3_ST_SW_CERT_REQ_A:
349 case SSL3_ST_SW_CERT_REQ_B:
350 if (/* don't request cert unless asked for it: */
351 !(s->verify_mode & SSL_VERIFY_PEER) ||
352 /* if SSL_VERIFY_CLIENT_ONCE is set,
353 * don't request cert during re-negotiation: */
354 ((s->session->peer != NULL) &&
355 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
356 /* never request cert in anonymous ciphersuites
357 * (see section "Certificate request" in SSL 3 drafts
358 * and in RFC 2246): */
359 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
360 /* ... except when the application insists on verification
361 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
362 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
363 {
364 /* no cert request */
365 skip=1;
366 s->s3->tmp.cert_request=0;
367 s->state=SSL3_ST_SW_SRVR_DONE_A;
368 }
369 else
370 {
371 s->s3->tmp.cert_request=1;
372 ret=ssl3_send_certificate_request(s);
373 if (ret <= 0) goto end;
374#ifndef NETSCAPE_HANG_BUG
375 s->state=SSL3_ST_SW_SRVR_DONE_A;
376#else
377 s->state=SSL3_ST_SW_FLUSH;
378 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
379#endif
380 s->init_num=0;
381 }
382 break;
383
384 case SSL3_ST_SW_SRVR_DONE_A:
385 case SSL3_ST_SW_SRVR_DONE_B:
386 ret=ssl3_send_server_done(s);
387 if (ret <= 0) goto end;
388 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
389 s->state=SSL3_ST_SW_FLUSH;
390 s->init_num=0;
391 break;
392
393 case SSL3_ST_SW_FLUSH:
394 /* number of bytes to be flushed */
395 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
396 if (num1 > 0)
397 {
398 s->rwstate=SSL_WRITING;
399 num1=BIO_flush(s->wbio);
400 if (num1 <= 0) { ret= -1; goto end; }
401 s->rwstate=SSL_NOTHING;
402 }
403
404 s->state=s->s3->tmp.next_state;
405 break;
406
407 case SSL3_ST_SR_CERT_A:
408 case SSL3_ST_SR_CERT_B:
409 /* Check for second client hello (MS SGC) */
410 ret = ssl3_check_client_hello(s);
411 if (ret <= 0)
412 goto end;
413 if (ret == 2)
414 s->state = SSL3_ST_SR_CLNT_HELLO_C;
415 else {
416 /* could be sent for a DH cert, even if we
417 * have not asked for it :-) */
418 ret=ssl3_get_client_certificate(s);
419 if (ret <= 0) goto end;
420 s->init_num=0;
421 s->state=SSL3_ST_SR_KEY_EXCH_A;
422 }
423 break;
424
425 case SSL3_ST_SR_KEY_EXCH_A:
426 case SSL3_ST_SR_KEY_EXCH_B:
427 ret=ssl3_get_client_key_exchange(s);
428 if (ret <= 0) goto end;
429 s->state=SSL3_ST_SR_CERT_VRFY_A;
430 s->init_num=0;
431
432 /* We need to get hashes here so if there is
433 * a client cert, it can be verified */
434 s->method->ssl3_enc->cert_verify_mac(s,
435 &(s->s3->finish_dgst1),
436 &(s->s3->tmp.cert_verify_md[0]));
437 s->method->ssl3_enc->cert_verify_mac(s,
438 &(s->s3->finish_dgst2),
439 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
440
441 break;
442
443 case SSL3_ST_SR_CERT_VRFY_A:
444 case SSL3_ST_SR_CERT_VRFY_B:
445
446 /* we should decide if we expected this one */
447 ret=ssl3_get_cert_verify(s);
448 if (ret <= 0) goto end;
449
450 s->state=SSL3_ST_SR_FINISHED_A;
451 s->init_num=0;
452 break;
453
454 case SSL3_ST_SR_FINISHED_A:
455 case SSL3_ST_SR_FINISHED_B:
456 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
457 SSL3_ST_SR_FINISHED_B);
458 if (ret <= 0) goto end;
459 if (s->hit)
460 s->state=SSL_ST_OK;
461 else
462 s->state=SSL3_ST_SW_CHANGE_A;
463 s->init_num=0;
464 break;
465
466 case SSL3_ST_SW_CHANGE_A:
467 case SSL3_ST_SW_CHANGE_B:
468
469 s->session->cipher=s->s3->tmp.new_cipher;
470 if (!s->method->ssl3_enc->setup_key_block(s))
471 { ret= -1; goto end; }
472
473 ret=ssl3_send_change_cipher_spec(s,
474 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
475
476 if (ret <= 0) goto end;
477 s->state=SSL3_ST_SW_FINISHED_A;
478 s->init_num=0;
479
480 if (!s->method->ssl3_enc->change_cipher_state(s,
481 SSL3_CHANGE_CIPHER_SERVER_WRITE))
482 {
483 ret= -1;
484 goto end;
485 }
486
487 break;
488
489 case SSL3_ST_SW_FINISHED_A:
490 case SSL3_ST_SW_FINISHED_B:
491 ret=ssl3_send_finished(s,
492 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
493 s->method->ssl3_enc->server_finished_label,
494 s->method->ssl3_enc->server_finished_label_len);
495 if (ret <= 0) goto end;
496 s->state=SSL3_ST_SW_FLUSH;
497 if (s->hit)
498 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
499 else
500 s->s3->tmp.next_state=SSL_ST_OK;
501 s->init_num=0;
502 break;
503
504 case SSL_ST_OK:
505 /* clean a few things up */
506 ssl3_cleanup_key_block(s);
507
508 BUF_MEM_free(s->init_buf);
509 s->init_buf=NULL;
510
511 /* remove buffering on output */
512 ssl_free_wbio_buffer(s);
513
514 s->init_num=0;
515
516 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
517 {
518 /* actually not necessarily a 'new' session */
519
520 s->new_session=0;
521
522 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
523
524 s->ctx->stats.sess_accept_good++;
525 /* s->server=1; */
526 s->handshake_func=ssl3_accept;
527
528 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
529 }
530
531 ret = 1;
532 goto end;
533 /* break; */
534
535 default:
536 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
537 ret= -1;
538 goto end;
539 /* break; */
540 }
541
542 if (!s->s3->tmp.reuse_message && !skip)
543 {
544 if (s->debug)
545 {
546 if ((ret=BIO_flush(s->wbio)) <= 0)
547 goto end;
548 }
549
550
551 if ((cb != NULL) && (s->state != state))
552 {
553 new_state=s->state;
554 s->state=state;
555 cb(s,SSL_CB_ACCEPT_LOOP,1);
556 s->state=new_state;
557 }
558 }
559 skip=0;
560 }
561end:
562 /* BIO_flush(s->wbio); */
563
564 s->in_handshake--;
565 if (cb != NULL)
566 cb(s,SSL_CB_ACCEPT_EXIT,ret);
567 return(ret);
568 }
569
570static int ssl3_send_hello_request(SSL *s)
571 {
572 unsigned char *p;
573
574 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
575 {
576 p=(unsigned char *)s->init_buf->data;
577 *(p++)=SSL3_MT_HELLO_REQUEST;
578 *(p++)=0;
579 *(p++)=0;
580 *(p++)=0;
581
582 s->state=SSL3_ST_SW_HELLO_REQ_B;
583 /* number of bytes to write */
584 s->init_num=4;
585 s->init_off=0;
586 }
587
588 /* SSL3_ST_SW_HELLO_REQ_B */
589 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
590 }
591
592static int ssl3_check_client_hello(SSL *s)
593 {
594 int ok;
595 long n;
596
597 /* this function is called when we really expect a Certificate message,
598 * so permit appropriate message length */
599 n=ssl3_get_message(s,
600 SSL3_ST_SR_CERT_A,
601 SSL3_ST_SR_CERT_B,
602 -1,
603#if defined(MSDOS) && !defined(WIN32)
604 1024*30, /* 30k max cert list :-) */
605#else
606 1024*100, /* 100k max cert list :-) */
607#endif
608 &ok);
609 if (!ok) return((int)n);
610 s->s3->tmp.reuse_message = 1;
611 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
612 {
613 /* Throw away what we have done so far in the current handshake,
614 * which will now be aborted. (A full SSL_clear would be too much.)
615 * I hope that tmp.dh is the only thing that may need to be cleared
616 * when a handshake is not completed ... */
617#ifndef NO_DH
618 if (s->s3->tmp.dh != NULL)
619 {
620 DH_free(s->s3->tmp.dh);
621 s->s3->tmp.dh = NULL;
622 }
623#endif
624 return 2;
625 }
626 return 1;
627}
628
629static int ssl3_get_client_hello(SSL *s)
630 {
631 int i,j,ok,al,ret= -1;
632 long n;
633 unsigned long id;
634 unsigned char *p,*d,*q;
635 SSL_CIPHER *c;
636 SSL_COMP *comp=NULL;
637 STACK_OF(SSL_CIPHER) *ciphers=NULL;
638
639 /* We do this so that we will respond with our native type.
640 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
641 * This down switching should be handled by a different method.
642 * If we are SSLv3, we will respond with SSLv3, even if prompted with
643 * TLSv1.
644 */
645 if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
646 {
647 s->first_packet=1;
648 s->state=SSL3_ST_SR_CLNT_HELLO_B;
649 }
650 n=ssl3_get_message(s,
651 SSL3_ST_SR_CLNT_HELLO_B,
652 SSL3_ST_SR_CLNT_HELLO_C,
653 SSL3_MT_CLIENT_HELLO,
654 SSL3_RT_MAX_PLAIN_LENGTH,
655 &ok);
656
657 if (!ok) return((int)n);
658 d=p=(unsigned char *)s->init_buf->data;
659
660 /* use version from inside client hello, not from record header
661 * (may differ: see RFC 2246, Appendix E, second paragraph) */
662 s->client_version=(((int)p[0])<<8)|(int)p[1];
663 p+=2;
664
665 if (s->client_version < s->version)
666 {
667 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
668 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
669 {
670 /* similar to ssl3_get_record, send alert using remote version number */
671 s->version = s->client_version;
672 }
673 al = SSL_AD_PROTOCOL_VERSION;
674 goto f_err;
675 }
676
677 /* load the client random */
678 memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
679 p+=SSL3_RANDOM_SIZE;
680
681 /* get the session-id */
682 j= *(p++);
683
684 s->hit=0;
685 if (j == 0)
686 {
687 if (!ssl_get_new_session(s,1))
688 goto err;
689 }
690 else
691 {
692 i=ssl_get_prev_session(s,p,j);
693 if (i == 1)
694 { /* previous session */
695 s->hit=1;
696 }
697 else if (i == -1)
698 goto err;
699 else /* i == 0 */
700 {
701 if (!ssl_get_new_session(s,1))
702 goto err;
703 }
704 }
705
706 p+=j;
707 n2s(p,i);
708 if ((i == 0) && (j != 0))
709 {
710 /* we need a cipher if we are not resuming a session */
711 al=SSL_AD_ILLEGAL_PARAMETER;
712 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
713 goto f_err;
714 }
715 if ((p+i) >= (d+n))
716 {
717 /* not enough data */
718 al=SSL_AD_DECODE_ERROR;
719 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
720 goto f_err;
721 }
722 if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
723 == NULL))
724 {
725 goto err;
726 }
727 p+=i;
728
729 /* If it is a hit, check that the cipher is in the list */
730 if ((s->hit) && (i > 0))
731 {
732 j=0;
733 id=s->session->cipher->id;
734
735#ifdef CIPHER_DEBUG
736 printf("client sent %d ciphers\n",sk_num(ciphers));
737#endif
738 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
739 {
740 c=sk_SSL_CIPHER_value(ciphers,i);
741#ifdef CIPHER_DEBUG
742 printf("client [%2d of %2d]:%s\n",
743 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
744#endif
745 if (c->id == id)
746 {
747 j=1;
748 break;
749 }
750 }
751 if (j == 0)
752 {
753 if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
754 {
755 /* Very bad for multi-threading.... */
756 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
757 0);
758 }
759 else
760 {
761 /* we need to have the cipher in the cipher
762 * list if we are asked to reuse it */
763 al=SSL_AD_ILLEGAL_PARAMETER;
764 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
765 goto f_err;
766 }
767 }
768 }
769
770 /* compression */
771 i= *(p++);
772 if ((p+i) > (d+n))
773 {
774 /* not enough data */
775 al=SSL_AD_DECODE_ERROR;
776 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
777 goto f_err;
778 }
779 q=p;
780 for (j=0; j<i; j++)
781 {
782 if (p[j] == 0) break;
783 }
784
785 p+=i;
786 if (j >= i)
787 {
788 /* no compress */
789 al=SSL_AD_DECODE_ERROR;
790 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
791 goto f_err;
792 }
793
794 /* Worst case, we will use the NULL compression, but if we have other
795 * options, we will now look for them. We have i-1 compression
796 * algorithms from the client, starting at q. */
797 s->s3->tmp.new_compression=NULL;
798 if (s->ctx->comp_methods != NULL)
799 { /* See if we have a match */
800 int m,nn,o,v,done=0;
801
802 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
803 for (m=0; m<nn; m++)
804 {
805 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
806 v=comp->id;
807 for (o=0; o<i; o++)
808 {
809 if (v == q[o])
810 {
811 done=1;
812 break;
813 }
814 }
815 if (done) break;
816 }
817 if (done)
818 s->s3->tmp.new_compression=comp;
819 else
820 comp=NULL;
821 }
822
823 /* TLS does not mind if there is extra stuff */
824 if (s->version == SSL3_VERSION)
825 {
826 if (p < (d+n))
827 {
828 /* wrong number of bytes,
829 * there could be more to follow */
830 al=SSL_AD_DECODE_ERROR;
831 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
832 goto f_err;
833 }
834 }
835
836 /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
837 * pick a cipher */
838
839 if (!s->hit)
840 {
841 s->session->compress_meth=(comp == NULL)?0:comp->id;
842 if (s->session->ciphers != NULL)
843 sk_SSL_CIPHER_free(s->session->ciphers);
844 s->session->ciphers=ciphers;
845 if (ciphers == NULL)
846 {
847 al=SSL_AD_ILLEGAL_PARAMETER;
848 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
849 goto f_err;
850 }
851 ciphers=NULL;
852 c=ssl3_choose_cipher(s,s->session->ciphers,
853 ssl_get_ciphers_by_id(s));
854
855 if (c == NULL)
856 {
857 al=SSL_AD_HANDSHAKE_FAILURE;
858 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
859 goto f_err;
860 }
861 s->s3->tmp.new_cipher=c;
862 }
863 else
864 {
865 /* Session-id reuse */
866#ifdef REUSE_CIPHER_BUG
867 STACK_OF(SSL_CIPHER) *sk;
868 SSL_CIPHER *nc=NULL;
869 SSL_CIPHER *ec=NULL;
870
871 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
872 {
873 sk=s->session->ciphers;
874 for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
875 {
876 c=sk_SSL_CIPHER_value(sk,i);
877 if (c->algorithms & SSL_eNULL)
878 nc=c;
879 if (SSL_C_IS_EXPORT(c))
880 ec=c;
881 }
882 if (nc != NULL)
883 s->s3->tmp.new_cipher=nc;
884 else if (ec != NULL)
885 s->s3->tmp.new_cipher=ec;
886 else
887 s->s3->tmp.new_cipher=s->session->cipher;
888 }
889 else
890#endif
891 s->s3->tmp.new_cipher=s->session->cipher;
892 }
893
894 /* we now have the following setup.
895 * client_random
896 * cipher_list - our prefered list of ciphers
897 * ciphers - the clients prefered list of ciphers
898 * compression - basically ignored right now
899 * ssl version is set - sslv3
900 * s->session - The ssl session has been setup.
901 * s->hit - session reuse flag
902 * s->tmp.new_cipher - the new cipher to use.
903 */
904
905 ret=1;
906 if (0)
907 {
908f_err:
909 ssl3_send_alert(s,SSL3_AL_FATAL,al);
910 }
911err:
912 if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
913 return(ret);
914 }
915
916static int ssl3_send_server_hello(SSL *s)
917 {
918 unsigned char *buf;
919 unsigned char *p,*d;
920 int i,sl;
921 unsigned long l,Time;
922
923 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
924 {
925 buf=(unsigned char *)s->init_buf->data;
926 p=s->s3->server_random;
927 Time=time(NULL); /* Time */
928 l2n(Time,p);
929 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
930 /* Do the message type and length last */
931 d=p= &(buf[4]);
932
933 *(p++)=s->version>>8;
934 *(p++)=s->version&0xff;
935
936 /* Random stuff */
937 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
938 p+=SSL3_RANDOM_SIZE;
939
940 /* now in theory we have 3 options to sending back the
941 * session id. If it is a re-use, we send back the
942 * old session-id, if it is a new session, we send
943 * back the new session-id or we send back a 0 length
944 * session-id if we want it to be single use.
945 * Currently I will not implement the '0' length session-id
946 * 12-Jan-98 - I'll now support the '0' length stuff.
947 */
948 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
949 s->session->session_id_length=0;
950
951 sl=s->session->session_id_length;
|
953 *(p++)=sl;
954 memcpy(p,s->session->session_id,sl);
955 p+=sl;
956
957 /* put the cipher */
958 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
959 p+=i;
960
961 /* put the compression method */
962 if (s->s3->tmp.new_compression == NULL)
963 *(p++)=0;
964 else
965 *(p++)=s->s3->tmp.new_compression->id;
966
967 /* do the header */
968 l=(p-d);
969 d=buf;
970 *(d++)=SSL3_MT_SERVER_HELLO;
971 l2n3(l,d);
972
973 s->state=SSL3_ST_CW_CLNT_HELLO_B;
974 /* number of bytes to write */
975 s->init_num=p-buf;
976 s->init_off=0;
977 }
978
979 /* SSL3_ST_CW_CLNT_HELLO_B */
980 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
981 }
982
983static int ssl3_send_server_done(SSL *s)
984 {
985 unsigned char *p;
986
987 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
988 {
989 p=(unsigned char *)s->init_buf->data;
990
991 /* do the header */
992 *(p++)=SSL3_MT_SERVER_DONE;
993 *(p++)=0;
994 *(p++)=0;
995 *(p++)=0;
996
997 s->state=SSL3_ST_SW_SRVR_DONE_B;
998 /* number of bytes to write */
999 s->init_num=4;
1000 s->init_off=0;
1001 }
1002
1003 /* SSL3_ST_CW_CLNT_HELLO_B */
1004 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1005 }
1006
1007static int ssl3_send_server_key_exchange(SSL *s)
1008 {
1009#ifndef NO_RSA
1010 unsigned char *q;
1011 int j,num;
1012 RSA *rsa;
1013 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1014 unsigned int u;
1015#endif
1016#ifndef NO_DH
1017 DH *dh=NULL,*dhp;
1018#endif
1019 EVP_PKEY *pkey;
1020 unsigned char *p,*d;
1021 int al,i;
1022 unsigned long type;
1023 int n;
1024 CERT *cert;
1025 BIGNUM *r[4];
1026 int nr[4],kn;
1027 BUF_MEM *buf;
1028 EVP_MD_CTX md_ctx;
1029
1030 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1031 {
1032 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1033 cert=s->cert;
1034
1035 buf=s->init_buf;
1036
1037 r[0]=r[1]=r[2]=r[3]=NULL;
1038 n=0;
1039#ifndef NO_RSA
1040 if (type & SSL_kRSA)
1041 {
1042 rsa=cert->rsa_tmp;
1043 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1044 {
1045 rsa=s->cert->rsa_tmp_cb(s,
1046 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1047 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1048 if(rsa == NULL)
1049 {
1050 al=SSL_AD_HANDSHAKE_FAILURE;
1051 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1052 goto f_err;
1053 }
1054 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
1055 cert->rsa_tmp=rsa;
1056 }
1057 if (rsa == NULL)
1058 {
1059 al=SSL_AD_HANDSHAKE_FAILURE;
1060 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1061 goto f_err;
1062 }
1063 r[0]=rsa->n;
1064 r[1]=rsa->e;
1065 s->s3->tmp.use_rsa_tmp=1;
1066 }
1067 else
1068#endif
1069#ifndef NO_DH
1070 if (type & SSL_kEDH)
1071 {
1072 dhp=cert->dh_tmp;
1073 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1074 dhp=s->cert->dh_tmp_cb(s,
1075 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1076 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1077 if (dhp == NULL)
1078 {
1079 al=SSL_AD_HANDSHAKE_FAILURE;
1080 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1081 goto f_err;
1082 }
1083
1084 if (s->s3->tmp.dh != NULL)
1085 {
1086 DH_free(dh);
1087 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
1088 goto err;
1089 }
1090
1091 if ((dh=DHparams_dup(dhp)) == NULL)
1092 {
1093 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1094 goto err;
1095 }
1096
1097 s->s3->tmp.dh=dh;
1098 if ((dhp->pub_key == NULL ||
1099 dhp->priv_key == NULL ||
1100 (s->options & SSL_OP_SINGLE_DH_USE)))
1101 {
1102 if(!DH_generate_key(dh))
1103 {
1104 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1105 ERR_R_DH_LIB);
1106 goto err;
1107 }
1108 }
1109 else
1110 {
1111 dh->pub_key=BN_dup(dhp->pub_key);
1112 dh->priv_key=BN_dup(dhp->priv_key);
1113 if ((dh->pub_key == NULL) ||
1114 (dh->priv_key == NULL))
1115 {
1116 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1117 goto err;
1118 }
1119 }
1120 r[0]=dh->p;
1121 r[1]=dh->g;
1122 r[2]=dh->pub_key;
1123 }
1124 else
1125#endif
1126 {
1127 al=SSL_AD_HANDSHAKE_FAILURE;
1128 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1129 goto f_err;
1130 }
1131 for (i=0; r[i] != NULL; i++)
1132 {
1133 nr[i]=BN_num_bytes(r[i]);
1134 n+=2+nr[i];
1135 }
1136
1137 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1138 {
1139 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1140 == NULL)
1141 {
1142 al=SSL_AD_DECODE_ERROR;
1143 goto f_err;
1144 }
1145 kn=EVP_PKEY_size(pkey);
1146 }
1147 else
1148 {
1149 pkey=NULL;
1150 kn=0;
1151 }
1152
1153 if (!BUF_MEM_grow(buf,n+4+kn))
1154 {
1155 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1156 goto err;
1157 }
1158 d=(unsigned char *)s->init_buf->data;
1159 p= &(d[4]);
1160
1161 for (i=0; r[i] != NULL; i++)
1162 {
1163 s2n(nr[i],p);
1164 BN_bn2bin(r[i],p);
1165 p+=nr[i];
1166 }
1167
1168 /* not anonymous */
1169 if (pkey != NULL)
1170 {
1171 /* n is the length of the params, they start at &(d[4])
1172 * and p points to the space at the end. */
1173#ifndef NO_RSA
1174 if (pkey->type == EVP_PKEY_RSA)
1175 {
1176 q=md_buf;
1177 j=0;
1178 for (num=2; num > 0; num--)
1179 {
1180 EVP_DigestInit(&md_ctx,(num == 2)
1181 ?s->ctx->md5:s->ctx->sha1);
1182 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1183 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1184 EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1185 EVP_DigestFinal(&md_ctx,q,
1186 (unsigned int *)&i);
1187 q+=i;
1188 j+=i;
1189 }
1190 if (RSA_sign(NID_md5_sha1, md_buf, j,
1191 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1192 {
1193 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1194 goto err;
1195 }
1196 s2n(u,p);
1197 n+=u+2;
1198 }
1199 else
1200#endif
1201#if !defined(NO_DSA)
1202 if (pkey->type == EVP_PKEY_DSA)
1203 {
1204 /* lets do DSS */
1205 EVP_SignInit(&md_ctx,EVP_dss1());
1206 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1207 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1208 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1209 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1210 (unsigned int *)&i,pkey))
1211 {
1212 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1213 goto err;
1214 }
1215 s2n(i,p);
1216 n+=i+2;
1217 }
1218 else
1219#endif
1220 {
1221 /* Is this error check actually needed? */
1222 al=SSL_AD_HANDSHAKE_FAILURE;
1223 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1224 goto f_err;
1225 }
1226 }
1227
1228 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1229 l2n3(n,d);
1230
1231 /* we should now have things packed up, so lets send
1232 * it off */
1233 s->init_num=n+4;
1234 s->init_off=0;
1235 }
1236
1237 s->state = SSL3_ST_SW_KEY_EXCH_B;
1238 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1239f_err:
1240 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1241err:
1242 return(-1);
1243 }
1244
1245static int ssl3_send_certificate_request(SSL *s)
1246 {
1247 unsigned char *p,*d;
1248 int i,j,nl,off,n;
1249 STACK_OF(X509_NAME) *sk=NULL;
1250 X509_NAME *name;
1251 BUF_MEM *buf;
1252
1253 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1254 {
1255 buf=s->init_buf;
1256
1257 d=p=(unsigned char *)&(buf->data[4]);
1258
1259 /* get the list of acceptable cert types */
1260 p++;
1261 n=ssl3_get_req_cert_type(s,p);
1262 d[0]=n;
1263 p+=n;
1264 n++;
1265
1266 off=n;
1267 p+=2;
1268 n+=2;
1269
1270 sk=SSL_get_client_CA_list(s);
1271 nl=0;
1272 if (sk != NULL)
1273 {
1274 for (i=0; i<sk_X509_NAME_num(sk); i++)
1275 {
1276 name=sk_X509_NAME_value(sk,i);
1277 j=i2d_X509_NAME(name,NULL);
1278 if (!BUF_MEM_grow(buf,4+n+j+2))
1279 {
1280 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1281 goto err;
1282 }
1283 p=(unsigned char *)&(buf->data[4+n]);
1284 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1285 {
1286 s2n(j,p);
1287 i2d_X509_NAME(name,&p);
1288 n+=2+j;
1289 nl+=2+j;
1290 }
1291 else
1292 {
1293 d=p;
1294 i2d_X509_NAME(name,&p);
1295 j-=2; s2n(j,d); j+=2;
1296 n+=j;
1297 nl+=j;
1298 }
1299 }
1300 }
1301 /* else no CA names */
1302 p=(unsigned char *)&(buf->data[4+off]);
1303 s2n(nl,p);
1304
1305 d=(unsigned char *)buf->data;
1306 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1307 l2n3(n,d);
1308
1309 /* we should now have things packed up, so lets send
1310 * it off */
1311
1312 s->init_num=n+4;
1313 s->init_off=0;
1314#ifdef NETSCAPE_HANG_BUG
1315 p=(unsigned char *)s->init_buf->data + s->init_num;
1316
1317 /* do the header */
1318 *(p++)=SSL3_MT_SERVER_DONE;
1319 *(p++)=0;
1320 *(p++)=0;
1321 *(p++)=0;
1322 s->init_num += 4;
1323#endif
1324
1325 }
1326
1327 /* SSL3_ST_SW_CERT_REQ_B */
1328 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1329err:
1330 return(-1);
1331 }
1332
1333static int ssl3_get_client_key_exchange(SSL *s)
1334 {
1335 int i,al,ok;
1336 long n;
1337 unsigned long l;
1338 unsigned char *p;
1339#ifndef NO_RSA
1340 RSA *rsa=NULL;
1341 EVP_PKEY *pkey=NULL;
1342#endif
1343#ifndef NO_DH
1344 BIGNUM *pub=NULL;
1345 DH *dh_srvr;
1346#endif
1347
1348 n=ssl3_get_message(s,
1349 SSL3_ST_SR_KEY_EXCH_A,
1350 SSL3_ST_SR_KEY_EXCH_B,
1351 SSL3_MT_CLIENT_KEY_EXCHANGE,
1352 2048, /* ???? */
1353 &ok);
1354
1355 if (!ok) return((int)n);
1356 p=(unsigned char *)s->init_buf->data;
1357
1358 l=s->s3->tmp.new_cipher->algorithms;
1359
1360#ifndef NO_RSA
1361 if (l & SSL_kRSA)
1362 {
1363 /* FIX THIS UP EAY EAY EAY EAY */
1364 if (s->s3->tmp.use_rsa_tmp)
1365 {
1366 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1367 rsa=s->cert->rsa_tmp;
1368 /* Don't do a callback because rsa_tmp should
1369 * be sent already */
1370 if (rsa == NULL)
1371 {
1372 al=SSL_AD_HANDSHAKE_FAILURE;
1373 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1374 goto f_err;
1375
1376 }
1377 }
1378 else
1379 {
1380 pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1381 if ( (pkey == NULL) ||
1382 (pkey->type != EVP_PKEY_RSA) ||
1383 (pkey->pkey.rsa == NULL))
1384 {
1385 al=SSL_AD_HANDSHAKE_FAILURE;
1386 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1387 goto f_err;
1388 }
1389 rsa=pkey->pkey.rsa;
1390 }
1391
1392 /* TLS */
1393 if (s->version > SSL3_VERSION)
1394 {
1395 n2s(p,i);
1396 if (n != i+2)
1397 {
1398 if (!(s->options & SSL_OP_TLS_D5_BUG))
1399 {
1400 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1401 goto err;
1402 }
1403 else
1404 p-=2;
1405 }
1406 else
1407 n=i;
1408 }
1409
1410 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1411
1412 al = -1;
1413
1414 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1415 {
1416 al=SSL_AD_DECODE_ERROR;
1417 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1418 }
1419
1420 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1421 {
1422 /* The premaster secret must contain the same version number as the
1423 * ClientHello to detect version rollback attacks (strangely, the
1424 * protocol does not offer such protection for DH ciphersuites).
1425 * However, buggy clients exist that send the negotiated protocol
1426 * version instead if the server does not support the requested
1427 * protocol version.
1428 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1429 if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1430 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1431 {
1432 al=SSL_AD_DECODE_ERROR;
1433 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1434 goto f_err;
1435 }
1436 }
1437
1438 if (al != -1)
1439 {
1440#if 0
1441 goto f_err;
1442#else
1443 /* Some decryption failure -- use random value instead as countermeasure
1444 * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1445 * (see RFC 2246, section 7.4.7.1).
1446 * But note that due to length and protocol version checking, the
1447 * attack is impractical anyway (see section 5 in D. Bleichenbacher:
1448 * "Chosen Ciphertext Attacks Against Protocols Based on the RSA
1449 * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12).
1450 */
1451 ERR_clear_error();
1452 i = SSL_MAX_MASTER_KEY_LENGTH;
1453 p[0] = s->client_version >> 8;
1454 p[1] = s->client_version & 0xff;
1455 RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1456#endif
1457 }
1458
1459 s->session->master_key_length=
1460 s->method->ssl3_enc->generate_master_secret(s,
1461 s->session->master_key,
1462 p,i);
1463 memset(p,0,i);
1464 }
1465 else
1466#endif
1467#ifndef NO_DH
1468 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1469 {
1470 n2s(p,i);
1471 if (n != i+2)
1472 {
1473 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1474 {
1475 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1476 goto err;
1477 }
1478 else
1479 {
1480 p-=2;
1481 i=(int)n;
1482 }
1483 }
1484
1485 if (n == 0L) /* the parameters are in the cert */
1486 {
1487 al=SSL_AD_HANDSHAKE_FAILURE;
1488 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1489 goto f_err;
1490 }
1491 else
1492 {
1493 if (s->s3->tmp.dh == NULL)
1494 {
1495 al=SSL_AD_HANDSHAKE_FAILURE;
1496 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1497 goto f_err;
1498 }
1499 else
1500 dh_srvr=s->s3->tmp.dh;
1501 }
1502
1503 pub=BN_bin2bn(p,i,NULL);
1504 if (pub == NULL)
1505 {
1506 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1507 goto err;
1508 }
1509
1510 i=DH_compute_key(p,pub,dh_srvr);
1511
1512 if (i <= 0)
1513 {
1514 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1515 goto err;
1516 }
1517
1518 DH_free(s->s3->tmp.dh);
1519 s->s3->tmp.dh=NULL;
1520
1521 BN_clear_free(pub);
1522 pub=NULL;
1523 s->session->master_key_length=
1524 s->method->ssl3_enc->generate_master_secret(s,
1525 s->session->master_key,p,i);
1526 memset(p,0,i);
1527 }
1528 else
1529#endif
1530 {
1531 al=SSL_AD_HANDSHAKE_FAILURE;
1532 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1533 goto f_err;
1534 }
1535
1536 return(1);
1537f_err:
1538 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1539#if !defined(NO_DH) || !defined(NO_RSA)
1540err:
1541#endif
1542 return(-1);
1543 }
1544
1545static int ssl3_get_cert_verify(SSL *s)
1546 {
1547 EVP_PKEY *pkey=NULL;
1548 unsigned char *p;
1549 int al,ok,ret=0;
1550 long n;
1551 int type=0,i,j;
1552 X509 *peer;
1553
1554 n=ssl3_get_message(s,
1555 SSL3_ST_SR_CERT_VRFY_A,
1556 SSL3_ST_SR_CERT_VRFY_B,
1557 -1,
1558 512, /* 512? */
1559 &ok);
1560
1561 if (!ok) return((int)n);
1562
1563 if (s->session->peer != NULL)
1564 {
1565 peer=s->session->peer;
1566 pkey=X509_get_pubkey(peer);
1567 type=X509_certificate_type(peer,pkey);
1568 }
1569 else
1570 {
1571 peer=NULL;
1572 pkey=NULL;
1573 }
1574
1575 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1576 {
1577 s->s3->tmp.reuse_message=1;
1578 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1579 {
1580 al=SSL_AD_UNEXPECTED_MESSAGE;
1581 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1582 goto f_err;
1583 }
1584 ret=1;
1585 goto end;
1586 }
1587
1588 if (peer == NULL)
1589 {
1590 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1591 al=SSL_AD_UNEXPECTED_MESSAGE;
1592 goto f_err;
1593 }
1594
1595 if (!(type & EVP_PKT_SIGN))
1596 {
1597 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1598 al=SSL_AD_ILLEGAL_PARAMETER;
1599 goto f_err;
1600 }
1601
1602 if (s->s3->change_cipher_spec)
1603 {
1604 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1605 al=SSL_AD_UNEXPECTED_MESSAGE;
1606 goto f_err;
1607 }
1608
1609 /* we now have a signature that we need to verify */
1610 p=(unsigned char *)s->init_buf->data;
1611 n2s(p,i);
1612 n-=2;
1613 if (i > n)
1614 {
1615 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1616 al=SSL_AD_DECODE_ERROR;
1617 goto f_err;
1618 }
1619
1620 j=EVP_PKEY_size(pkey);
1621 if ((i > j) || (n > j) || (n <= 0))
1622 {
1623 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1624 al=SSL_AD_DECODE_ERROR;
1625 goto f_err;
1626 }
1627
1628#ifndef NO_RSA
1629 if (pkey->type == EVP_PKEY_RSA)
1630 {
1631 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1632 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1633 pkey->pkey.rsa);
1634 if (i < 0)
1635 {
1636 al=SSL_AD_DECRYPT_ERROR;
1637 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1638 goto f_err;
1639 }
1640 if (i == 0)
1641 {
1642 al=SSL_AD_DECRYPT_ERROR;
1643 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1644 goto f_err;
1645 }
1646 }
1647 else
1648#endif
1649#ifndef NO_DSA
1650 if (pkey->type == EVP_PKEY_DSA)
1651 {
1652 j=DSA_verify(pkey->save_type,
1653 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1654 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1655 if (j <= 0)
1656 {
1657 /* bad signature */
1658 al=SSL_AD_DECRYPT_ERROR;
1659 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1660 goto f_err;
1661 }
1662 }
1663 else
1664#endif
1665 {
1666 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1667 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1668 goto f_err;
1669 }
1670
1671
1672 ret=1;
1673 if (0)
1674 {
1675f_err:
1676 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1677 }
1678end:
1679 EVP_PKEY_free(pkey);
1680 return(ret);
1681 }
1682
1683static int ssl3_get_client_certificate(SSL *s)
1684 {
1685 int i,ok,al,ret= -1;
1686 X509 *x=NULL;
1687 unsigned long l,nc,llen,n;
1688 unsigned char *p,*d,*q;
1689 STACK_OF(X509) *sk=NULL;
1690
1691 n=ssl3_get_message(s,
1692 SSL3_ST_SR_CERT_A,
1693 SSL3_ST_SR_CERT_B,
1694 -1,
1695#if defined(MSDOS) && !defined(WIN32)
1696 1024*30, /* 30k max cert list :-) */
1697#else
1698 1024*100, /* 100k max cert list :-) */
1699#endif
1700 &ok);
1701
1702 if (!ok) return((int)n);
1703
1704 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1705 {
1706 if ( (s->verify_mode & SSL_VERIFY_PEER) &&
1707 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1708 {
1709 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1710 al=SSL_AD_HANDSHAKE_FAILURE;
1711 goto f_err;
1712 }
1713 /* If tls asked for a client cert, the client must return a 0 list */
1714 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1715 {
1716 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1717 al=SSL_AD_UNEXPECTED_MESSAGE;
1718 goto f_err;
1719 }
1720 s->s3->tmp.reuse_message=1;
1721 return(1);
1722 }
1723
1724 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1725 {
1726 al=SSL_AD_UNEXPECTED_MESSAGE;
1727 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1728 goto f_err;
1729 }
1730 d=p=(unsigned char *)s->init_buf->data;
1731
1732 if ((sk=sk_X509_new_null()) == NULL)
1733 {
1734 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1735 goto err;
1736 }
1737
1738 n2l3(p,llen);
1739 if (llen+3 != n)
1740 {
1741 al=SSL_AD_DECODE_ERROR;
1742 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1743 goto f_err;
1744 }
1745 for (nc=0; nc<llen; )
1746 {
1747 n2l3(p,l);
1748 if ((l+nc+3) > llen)
1749 {
1750 al=SSL_AD_DECODE_ERROR;
1751 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1752 goto f_err;
1753 }
1754
1755 q=p;
1756 x=d2i_X509(NULL,&p,l);
1757 if (x == NULL)
1758 {
1759 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1760 goto err;
1761 }
1762 if (p != (q+l))
1763 {
1764 al=SSL_AD_DECODE_ERROR;
1765 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1766 goto f_err;
1767 }
1768 if (!sk_X509_push(sk,x))
1769 {
1770 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1771 goto err;
1772 }
1773 x=NULL;
1774 nc+=l+3;
1775 }
1776
1777 if (sk_X509_num(sk) <= 0)
1778 {
1779 /* TLS does not mind 0 certs returned */
1780 if (s->version == SSL3_VERSION)
1781 {
1782 al=SSL_AD_HANDSHAKE_FAILURE;
1783 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1784 goto f_err;
1785 }
1786 /* Fail for TLS only if we required a certificate */
1787 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1788 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1789 {
1790 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1791 al=SSL_AD_HANDSHAKE_FAILURE;
1792 goto f_err;
1793 }
1794 }
1795 else
1796 {
1797 i=ssl_verify_cert_chain(s,sk);
1798 if (!i)
1799 {
1800 al=ssl_verify_alarm_type(s->verify_result);
1801 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1802 goto f_err;
1803 }
1804 }
1805
1806 if (s->session->peer != NULL) /* This should not be needed */
1807 X509_free(s->session->peer);
1808 s->session->peer=sk_X509_shift(sk);
1809 s->session->verify_result = s->verify_result;
1810
1811 /* With the current implementation, sess_cert will always be NULL
1812 * when we arrive here. */
1813 if (s->session->sess_cert == NULL)
1814 {
1815 s->session->sess_cert = ssl_sess_cert_new();
1816 if (s->session->sess_cert == NULL)
1817 {
1818 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1819 goto err;
1820 }
1821 }
1822 if (s->session->sess_cert->cert_chain != NULL)
1823 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1824 s->session->sess_cert->cert_chain=sk;
1825 /* Inconsistency alert: cert_chain does *not* include the
1826 * peer's own certificate, while we do include it in s3_clnt.c */
1827
1828 sk=NULL;
1829
1830 ret=1;
1831 if (0)
1832 {
1833f_err:
1834 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1835 }
1836err:
1837 if (x != NULL) X509_free(x);
1838 if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1839 return(ret);
1840 }
1841
1842int ssl3_send_server_certificate(SSL *s)
1843 {
1844 unsigned long l;
1845 X509 *x;
1846
1847 if (s->state == SSL3_ST_SW_CERT_A)
1848 {
1849 x=ssl_get_server_send_cert(s);
1850 if (x == NULL)
1851 {
1852 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1853 return(0);
1854 }
1855
1856 l=ssl3_output_cert_chain(s,x);
1857 s->state=SSL3_ST_SW_CERT_B;
1858 s->init_num=(int)l;
1859 s->init_off=0;
1860 }
1861
1862 /* SSL3_ST_SW_CERT_B */
1863 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1864 }
| 957 *(p++)=sl;
958 memcpy(p,s->session->session_id,sl);
959 p+=sl;
960
961 /* put the cipher */
962 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
963 p+=i;
964
965 /* put the compression method */
966 if (s->s3->tmp.new_compression == NULL)
967 *(p++)=0;
968 else
969 *(p++)=s->s3->tmp.new_compression->id;
970
971 /* do the header */
972 l=(p-d);
973 d=buf;
974 *(d++)=SSL3_MT_SERVER_HELLO;
975 l2n3(l,d);
976
977 s->state=SSL3_ST_CW_CLNT_HELLO_B;
978 /* number of bytes to write */
979 s->init_num=p-buf;
980 s->init_off=0;
981 }
982
983 /* SSL3_ST_CW_CLNT_HELLO_B */
984 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
985 }
986
987static int ssl3_send_server_done(SSL *s)
988 {
989 unsigned char *p;
990
991 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
992 {
993 p=(unsigned char *)s->init_buf->data;
994
995 /* do the header */
996 *(p++)=SSL3_MT_SERVER_DONE;
997 *(p++)=0;
998 *(p++)=0;
999 *(p++)=0;
1000
1001 s->state=SSL3_ST_SW_SRVR_DONE_B;
1002 /* number of bytes to write */
1003 s->init_num=4;
1004 s->init_off=0;
1005 }
1006
1007 /* SSL3_ST_CW_CLNT_HELLO_B */
1008 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1009 }
1010
1011static int ssl3_send_server_key_exchange(SSL *s)
1012 {
1013#ifndef NO_RSA
1014 unsigned char *q;
1015 int j,num;
1016 RSA *rsa;
1017 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1018 unsigned int u;
1019#endif
1020#ifndef NO_DH
1021 DH *dh=NULL,*dhp;
1022#endif
1023 EVP_PKEY *pkey;
1024 unsigned char *p,*d;
1025 int al,i;
1026 unsigned long type;
1027 int n;
1028 CERT *cert;
1029 BIGNUM *r[4];
1030 int nr[4],kn;
1031 BUF_MEM *buf;
1032 EVP_MD_CTX md_ctx;
1033
1034 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1035 {
1036 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1037 cert=s->cert;
1038
1039 buf=s->init_buf;
1040
1041 r[0]=r[1]=r[2]=r[3]=NULL;
1042 n=0;
1043#ifndef NO_RSA
1044 if (type & SSL_kRSA)
1045 {
1046 rsa=cert->rsa_tmp;
1047 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1048 {
1049 rsa=s->cert->rsa_tmp_cb(s,
1050 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1051 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1052 if(rsa == NULL)
1053 {
1054 al=SSL_AD_HANDSHAKE_FAILURE;
1055 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1056 goto f_err;
1057 }
1058 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
1059 cert->rsa_tmp=rsa;
1060 }
1061 if (rsa == NULL)
1062 {
1063 al=SSL_AD_HANDSHAKE_FAILURE;
1064 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1065 goto f_err;
1066 }
1067 r[0]=rsa->n;
1068 r[1]=rsa->e;
1069 s->s3->tmp.use_rsa_tmp=1;
1070 }
1071 else
1072#endif
1073#ifndef NO_DH
1074 if (type & SSL_kEDH)
1075 {
1076 dhp=cert->dh_tmp;
1077 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1078 dhp=s->cert->dh_tmp_cb(s,
1079 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1080 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1081 if (dhp == NULL)
1082 {
1083 al=SSL_AD_HANDSHAKE_FAILURE;
1084 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1085 goto f_err;
1086 }
1087
1088 if (s->s3->tmp.dh != NULL)
1089 {
1090 DH_free(dh);
1091 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
1092 goto err;
1093 }
1094
1095 if ((dh=DHparams_dup(dhp)) == NULL)
1096 {
1097 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1098 goto err;
1099 }
1100
1101 s->s3->tmp.dh=dh;
1102 if ((dhp->pub_key == NULL ||
1103 dhp->priv_key == NULL ||
1104 (s->options & SSL_OP_SINGLE_DH_USE)))
1105 {
1106 if(!DH_generate_key(dh))
1107 {
1108 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1109 ERR_R_DH_LIB);
1110 goto err;
1111 }
1112 }
1113 else
1114 {
1115 dh->pub_key=BN_dup(dhp->pub_key);
1116 dh->priv_key=BN_dup(dhp->priv_key);
1117 if ((dh->pub_key == NULL) ||
1118 (dh->priv_key == NULL))
1119 {
1120 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1121 goto err;
1122 }
1123 }
1124 r[0]=dh->p;
1125 r[1]=dh->g;
1126 r[2]=dh->pub_key;
1127 }
1128 else
1129#endif
1130 {
1131 al=SSL_AD_HANDSHAKE_FAILURE;
1132 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1133 goto f_err;
1134 }
1135 for (i=0; r[i] != NULL; i++)
1136 {
1137 nr[i]=BN_num_bytes(r[i]);
1138 n+=2+nr[i];
1139 }
1140
1141 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1142 {
1143 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1144 == NULL)
1145 {
1146 al=SSL_AD_DECODE_ERROR;
1147 goto f_err;
1148 }
1149 kn=EVP_PKEY_size(pkey);
1150 }
1151 else
1152 {
1153 pkey=NULL;
1154 kn=0;
1155 }
1156
1157 if (!BUF_MEM_grow(buf,n+4+kn))
1158 {
1159 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1160 goto err;
1161 }
1162 d=(unsigned char *)s->init_buf->data;
1163 p= &(d[4]);
1164
1165 for (i=0; r[i] != NULL; i++)
1166 {
1167 s2n(nr[i],p);
1168 BN_bn2bin(r[i],p);
1169 p+=nr[i];
1170 }
1171
1172 /* not anonymous */
1173 if (pkey != NULL)
1174 {
1175 /* n is the length of the params, they start at &(d[4])
1176 * and p points to the space at the end. */
1177#ifndef NO_RSA
1178 if (pkey->type == EVP_PKEY_RSA)
1179 {
1180 q=md_buf;
1181 j=0;
1182 for (num=2; num > 0; num--)
1183 {
1184 EVP_DigestInit(&md_ctx,(num == 2)
1185 ?s->ctx->md5:s->ctx->sha1);
1186 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1187 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1188 EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1189 EVP_DigestFinal(&md_ctx,q,
1190 (unsigned int *)&i);
1191 q+=i;
1192 j+=i;
1193 }
1194 if (RSA_sign(NID_md5_sha1, md_buf, j,
1195 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1196 {
1197 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1198 goto err;
1199 }
1200 s2n(u,p);
1201 n+=u+2;
1202 }
1203 else
1204#endif
1205#if !defined(NO_DSA)
1206 if (pkey->type == EVP_PKEY_DSA)
1207 {
1208 /* lets do DSS */
1209 EVP_SignInit(&md_ctx,EVP_dss1());
1210 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1211 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1212 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1213 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1214 (unsigned int *)&i,pkey))
1215 {
1216 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1217 goto err;
1218 }
1219 s2n(i,p);
1220 n+=i+2;
1221 }
1222 else
1223#endif
1224 {
1225 /* Is this error check actually needed? */
1226 al=SSL_AD_HANDSHAKE_FAILURE;
1227 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1228 goto f_err;
1229 }
1230 }
1231
1232 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1233 l2n3(n,d);
1234
1235 /* we should now have things packed up, so lets send
1236 * it off */
1237 s->init_num=n+4;
1238 s->init_off=0;
1239 }
1240
1241 s->state = SSL3_ST_SW_KEY_EXCH_B;
1242 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1243f_err:
1244 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1245err:
1246 return(-1);
1247 }
1248
1249static int ssl3_send_certificate_request(SSL *s)
1250 {
1251 unsigned char *p,*d;
1252 int i,j,nl,off,n;
1253 STACK_OF(X509_NAME) *sk=NULL;
1254 X509_NAME *name;
1255 BUF_MEM *buf;
1256
1257 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1258 {
1259 buf=s->init_buf;
1260
1261 d=p=(unsigned char *)&(buf->data[4]);
1262
1263 /* get the list of acceptable cert types */
1264 p++;
1265 n=ssl3_get_req_cert_type(s,p);
1266 d[0]=n;
1267 p+=n;
1268 n++;
1269
1270 off=n;
1271 p+=2;
1272 n+=2;
1273
1274 sk=SSL_get_client_CA_list(s);
1275 nl=0;
1276 if (sk != NULL)
1277 {
1278 for (i=0; i<sk_X509_NAME_num(sk); i++)
1279 {
1280 name=sk_X509_NAME_value(sk,i);
1281 j=i2d_X509_NAME(name,NULL);
1282 if (!BUF_MEM_grow(buf,4+n+j+2))
1283 {
1284 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1285 goto err;
1286 }
1287 p=(unsigned char *)&(buf->data[4+n]);
1288 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1289 {
1290 s2n(j,p);
1291 i2d_X509_NAME(name,&p);
1292 n+=2+j;
1293 nl+=2+j;
1294 }
1295 else
1296 {
1297 d=p;
1298 i2d_X509_NAME(name,&p);
1299 j-=2; s2n(j,d); j+=2;
1300 n+=j;
1301 nl+=j;
1302 }
1303 }
1304 }
1305 /* else no CA names */
1306 p=(unsigned char *)&(buf->data[4+off]);
1307 s2n(nl,p);
1308
1309 d=(unsigned char *)buf->data;
1310 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1311 l2n3(n,d);
1312
1313 /* we should now have things packed up, so lets send
1314 * it off */
1315
1316 s->init_num=n+4;
1317 s->init_off=0;
1318#ifdef NETSCAPE_HANG_BUG
1319 p=(unsigned char *)s->init_buf->data + s->init_num;
1320
1321 /* do the header */
1322 *(p++)=SSL3_MT_SERVER_DONE;
1323 *(p++)=0;
1324 *(p++)=0;
1325 *(p++)=0;
1326 s->init_num += 4;
1327#endif
1328
1329 }
1330
1331 /* SSL3_ST_SW_CERT_REQ_B */
1332 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1333err:
1334 return(-1);
1335 }
1336
1337static int ssl3_get_client_key_exchange(SSL *s)
1338 {
1339 int i,al,ok;
1340 long n;
1341 unsigned long l;
1342 unsigned char *p;
1343#ifndef NO_RSA
1344 RSA *rsa=NULL;
1345 EVP_PKEY *pkey=NULL;
1346#endif
1347#ifndef NO_DH
1348 BIGNUM *pub=NULL;
1349 DH *dh_srvr;
1350#endif
1351
1352 n=ssl3_get_message(s,
1353 SSL3_ST_SR_KEY_EXCH_A,
1354 SSL3_ST_SR_KEY_EXCH_B,
1355 SSL3_MT_CLIENT_KEY_EXCHANGE,
1356 2048, /* ???? */
1357 &ok);
1358
1359 if (!ok) return((int)n);
1360 p=(unsigned char *)s->init_buf->data;
1361
1362 l=s->s3->tmp.new_cipher->algorithms;
1363
1364#ifndef NO_RSA
1365 if (l & SSL_kRSA)
1366 {
1367 /* FIX THIS UP EAY EAY EAY EAY */
1368 if (s->s3->tmp.use_rsa_tmp)
1369 {
1370 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1371 rsa=s->cert->rsa_tmp;
1372 /* Don't do a callback because rsa_tmp should
1373 * be sent already */
1374 if (rsa == NULL)
1375 {
1376 al=SSL_AD_HANDSHAKE_FAILURE;
1377 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1378 goto f_err;
1379
1380 }
1381 }
1382 else
1383 {
1384 pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1385 if ( (pkey == NULL) ||
1386 (pkey->type != EVP_PKEY_RSA) ||
1387 (pkey->pkey.rsa == NULL))
1388 {
1389 al=SSL_AD_HANDSHAKE_FAILURE;
1390 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1391 goto f_err;
1392 }
1393 rsa=pkey->pkey.rsa;
1394 }
1395
1396 /* TLS */
1397 if (s->version > SSL3_VERSION)
1398 {
1399 n2s(p,i);
1400 if (n != i+2)
1401 {
1402 if (!(s->options & SSL_OP_TLS_D5_BUG))
1403 {
1404 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1405 goto err;
1406 }
1407 else
1408 p-=2;
1409 }
1410 else
1411 n=i;
1412 }
1413
1414 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1415
1416 al = -1;
1417
1418 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1419 {
1420 al=SSL_AD_DECODE_ERROR;
1421 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1422 }
1423
1424 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1425 {
1426 /* The premaster secret must contain the same version number as the
1427 * ClientHello to detect version rollback attacks (strangely, the
1428 * protocol does not offer such protection for DH ciphersuites).
1429 * However, buggy clients exist that send the negotiated protocol
1430 * version instead if the server does not support the requested
1431 * protocol version.
1432 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1433 if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1434 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1435 {
1436 al=SSL_AD_DECODE_ERROR;
1437 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1438 goto f_err;
1439 }
1440 }
1441
1442 if (al != -1)
1443 {
1444#if 0
1445 goto f_err;
1446#else
1447 /* Some decryption failure -- use random value instead as countermeasure
1448 * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1449 * (see RFC 2246, section 7.4.7.1).
1450 * But note that due to length and protocol version checking, the
1451 * attack is impractical anyway (see section 5 in D. Bleichenbacher:
1452 * "Chosen Ciphertext Attacks Against Protocols Based on the RSA
1453 * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12).
1454 */
1455 ERR_clear_error();
1456 i = SSL_MAX_MASTER_KEY_LENGTH;
1457 p[0] = s->client_version >> 8;
1458 p[1] = s->client_version & 0xff;
1459 RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1460#endif
1461 }
1462
1463 s->session->master_key_length=
1464 s->method->ssl3_enc->generate_master_secret(s,
1465 s->session->master_key,
1466 p,i);
1467 memset(p,0,i);
1468 }
1469 else
1470#endif
1471#ifndef NO_DH
1472 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1473 {
1474 n2s(p,i);
1475 if (n != i+2)
1476 {
1477 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1478 {
1479 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1480 goto err;
1481 }
1482 else
1483 {
1484 p-=2;
1485 i=(int)n;
1486 }
1487 }
1488
1489 if (n == 0L) /* the parameters are in the cert */
1490 {
1491 al=SSL_AD_HANDSHAKE_FAILURE;
1492 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1493 goto f_err;
1494 }
1495 else
1496 {
1497 if (s->s3->tmp.dh == NULL)
1498 {
1499 al=SSL_AD_HANDSHAKE_FAILURE;
1500 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1501 goto f_err;
1502 }
1503 else
1504 dh_srvr=s->s3->tmp.dh;
1505 }
1506
1507 pub=BN_bin2bn(p,i,NULL);
1508 if (pub == NULL)
1509 {
1510 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1511 goto err;
1512 }
1513
1514 i=DH_compute_key(p,pub,dh_srvr);
1515
1516 if (i <= 0)
1517 {
1518 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1519 goto err;
1520 }
1521
1522 DH_free(s->s3->tmp.dh);
1523 s->s3->tmp.dh=NULL;
1524
1525 BN_clear_free(pub);
1526 pub=NULL;
1527 s->session->master_key_length=
1528 s->method->ssl3_enc->generate_master_secret(s,
1529 s->session->master_key,p,i);
1530 memset(p,0,i);
1531 }
1532 else
1533#endif
1534 {
1535 al=SSL_AD_HANDSHAKE_FAILURE;
1536 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1537 goto f_err;
1538 }
1539
1540 return(1);
1541f_err:
1542 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1543#if !defined(NO_DH) || !defined(NO_RSA)
1544err:
1545#endif
1546 return(-1);
1547 }
1548
1549static int ssl3_get_cert_verify(SSL *s)
1550 {
1551 EVP_PKEY *pkey=NULL;
1552 unsigned char *p;
1553 int al,ok,ret=0;
1554 long n;
1555 int type=0,i,j;
1556 X509 *peer;
1557
1558 n=ssl3_get_message(s,
1559 SSL3_ST_SR_CERT_VRFY_A,
1560 SSL3_ST_SR_CERT_VRFY_B,
1561 -1,
1562 512, /* 512? */
1563 &ok);
1564
1565 if (!ok) return((int)n);
1566
1567 if (s->session->peer != NULL)
1568 {
1569 peer=s->session->peer;
1570 pkey=X509_get_pubkey(peer);
1571 type=X509_certificate_type(peer,pkey);
1572 }
1573 else
1574 {
1575 peer=NULL;
1576 pkey=NULL;
1577 }
1578
1579 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1580 {
1581 s->s3->tmp.reuse_message=1;
1582 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1583 {
1584 al=SSL_AD_UNEXPECTED_MESSAGE;
1585 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1586 goto f_err;
1587 }
1588 ret=1;
1589 goto end;
1590 }
1591
1592 if (peer == NULL)
1593 {
1594 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1595 al=SSL_AD_UNEXPECTED_MESSAGE;
1596 goto f_err;
1597 }
1598
1599 if (!(type & EVP_PKT_SIGN))
1600 {
1601 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1602 al=SSL_AD_ILLEGAL_PARAMETER;
1603 goto f_err;
1604 }
1605
1606 if (s->s3->change_cipher_spec)
1607 {
1608 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1609 al=SSL_AD_UNEXPECTED_MESSAGE;
1610 goto f_err;
1611 }
1612
1613 /* we now have a signature that we need to verify */
1614 p=(unsigned char *)s->init_buf->data;
1615 n2s(p,i);
1616 n-=2;
1617 if (i > n)
1618 {
1619 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1620 al=SSL_AD_DECODE_ERROR;
1621 goto f_err;
1622 }
1623
1624 j=EVP_PKEY_size(pkey);
1625 if ((i > j) || (n > j) || (n <= 0))
1626 {
1627 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1628 al=SSL_AD_DECODE_ERROR;
1629 goto f_err;
1630 }
1631
1632#ifndef NO_RSA
1633 if (pkey->type == EVP_PKEY_RSA)
1634 {
1635 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1636 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1637 pkey->pkey.rsa);
1638 if (i < 0)
1639 {
1640 al=SSL_AD_DECRYPT_ERROR;
1641 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1642 goto f_err;
1643 }
1644 if (i == 0)
1645 {
1646 al=SSL_AD_DECRYPT_ERROR;
1647 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1648 goto f_err;
1649 }
1650 }
1651 else
1652#endif
1653#ifndef NO_DSA
1654 if (pkey->type == EVP_PKEY_DSA)
1655 {
1656 j=DSA_verify(pkey->save_type,
1657 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1658 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1659 if (j <= 0)
1660 {
1661 /* bad signature */
1662 al=SSL_AD_DECRYPT_ERROR;
1663 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1664 goto f_err;
1665 }
1666 }
1667 else
1668#endif
1669 {
1670 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1671 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1672 goto f_err;
1673 }
1674
1675
1676 ret=1;
1677 if (0)
1678 {
1679f_err:
1680 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1681 }
1682end:
1683 EVP_PKEY_free(pkey);
1684 return(ret);
1685 }
1686
1687static int ssl3_get_client_certificate(SSL *s)
1688 {
1689 int i,ok,al,ret= -1;
1690 X509 *x=NULL;
1691 unsigned long l,nc,llen,n;
1692 unsigned char *p,*d,*q;
1693 STACK_OF(X509) *sk=NULL;
1694
1695 n=ssl3_get_message(s,
1696 SSL3_ST_SR_CERT_A,
1697 SSL3_ST_SR_CERT_B,
1698 -1,
1699#if defined(MSDOS) && !defined(WIN32)
1700 1024*30, /* 30k max cert list :-) */
1701#else
1702 1024*100, /* 100k max cert list :-) */
1703#endif
1704 &ok);
1705
1706 if (!ok) return((int)n);
1707
1708 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1709 {
1710 if ( (s->verify_mode & SSL_VERIFY_PEER) &&
1711 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1712 {
1713 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1714 al=SSL_AD_HANDSHAKE_FAILURE;
1715 goto f_err;
1716 }
1717 /* If tls asked for a client cert, the client must return a 0 list */
1718 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1719 {
1720 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1721 al=SSL_AD_UNEXPECTED_MESSAGE;
1722 goto f_err;
1723 }
1724 s->s3->tmp.reuse_message=1;
1725 return(1);
1726 }
1727
1728 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1729 {
1730 al=SSL_AD_UNEXPECTED_MESSAGE;
1731 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1732 goto f_err;
1733 }
1734 d=p=(unsigned char *)s->init_buf->data;
1735
1736 if ((sk=sk_X509_new_null()) == NULL)
1737 {
1738 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1739 goto err;
1740 }
1741
1742 n2l3(p,llen);
1743 if (llen+3 != n)
1744 {
1745 al=SSL_AD_DECODE_ERROR;
1746 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1747 goto f_err;
1748 }
1749 for (nc=0; nc<llen; )
1750 {
1751 n2l3(p,l);
1752 if ((l+nc+3) > llen)
1753 {
1754 al=SSL_AD_DECODE_ERROR;
1755 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1756 goto f_err;
1757 }
1758
1759 q=p;
1760 x=d2i_X509(NULL,&p,l);
1761 if (x == NULL)
1762 {
1763 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1764 goto err;
1765 }
1766 if (p != (q+l))
1767 {
1768 al=SSL_AD_DECODE_ERROR;
1769 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1770 goto f_err;
1771 }
1772 if (!sk_X509_push(sk,x))
1773 {
1774 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1775 goto err;
1776 }
1777 x=NULL;
1778 nc+=l+3;
1779 }
1780
1781 if (sk_X509_num(sk) <= 0)
1782 {
1783 /* TLS does not mind 0 certs returned */
1784 if (s->version == SSL3_VERSION)
1785 {
1786 al=SSL_AD_HANDSHAKE_FAILURE;
1787 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1788 goto f_err;
1789 }
1790 /* Fail for TLS only if we required a certificate */
1791 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1792 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1793 {
1794 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1795 al=SSL_AD_HANDSHAKE_FAILURE;
1796 goto f_err;
1797 }
1798 }
1799 else
1800 {
1801 i=ssl_verify_cert_chain(s,sk);
1802 if (!i)
1803 {
1804 al=ssl_verify_alarm_type(s->verify_result);
1805 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1806 goto f_err;
1807 }
1808 }
1809
1810 if (s->session->peer != NULL) /* This should not be needed */
1811 X509_free(s->session->peer);
1812 s->session->peer=sk_X509_shift(sk);
1813 s->session->verify_result = s->verify_result;
1814
1815 /* With the current implementation, sess_cert will always be NULL
1816 * when we arrive here. */
1817 if (s->session->sess_cert == NULL)
1818 {
1819 s->session->sess_cert = ssl_sess_cert_new();
1820 if (s->session->sess_cert == NULL)
1821 {
1822 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1823 goto err;
1824 }
1825 }
1826 if (s->session->sess_cert->cert_chain != NULL)
1827 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1828 s->session->sess_cert->cert_chain=sk;
1829 /* Inconsistency alert: cert_chain does *not* include the
1830 * peer's own certificate, while we do include it in s3_clnt.c */
1831
1832 sk=NULL;
1833
1834 ret=1;
1835 if (0)
1836 {
1837f_err:
1838 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1839 }
1840err:
1841 if (x != NULL) X509_free(x);
1842 if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1843 return(ret);
1844 }
1845
1846int ssl3_send_server_certificate(SSL *s)
1847 {
1848 unsigned long l;
1849 X509 *x;
1850
1851 if (s->state == SSL3_ST_SW_CERT_A)
1852 {
1853 x=ssl_get_server_send_cert(s);
1854 if (x == NULL)
1855 {
1856 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1857 return(0);
1858 }
1859
1860 l=ssl3_output_cert_chain(s,x);
1861 s->state=SSL3_ST_SW_CERT_B;
1862 s->init_num=(int)l;
1863 s->init_off=0;
1864 }
1865
1866 /* SSL3_ST_SW_CERT_B */
1867 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1868 }
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