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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 "ssl_locl.h"
118#include "kssl_lcl.h"
119#include <openssl/buffer.h>
120#include <openssl/rand.h>
121#include <openssl/objects.h>
122#include <openssl/evp.h>
123#include <openssl/x509.h>
124#ifndef OPENSSL_NO_KRB5
125#include <openssl/krb5_asn.h>
126#endif
127#include <openssl/md5.h>
128#include <openssl/fips.h>
129
130static SSL_METHOD *ssl3_get_server_method(int ver);
131static int ssl3_get_client_hello(SSL *s);
132static int ssl3_check_client_hello(SSL *s);
133static int ssl3_send_server_hello(SSL *s);
134static int ssl3_send_server_key_exchange(SSL *s);
135static int ssl3_send_certificate_request(SSL *s);
136static int ssl3_send_server_done(SSL *s);
137static int ssl3_get_client_key_exchange(SSL *s);
138static int ssl3_get_client_certificate(SSL *s);
139static int ssl3_get_cert_verify(SSL *s);
140static int ssl3_send_hello_request(SSL *s);
141
142static SSL_METHOD *ssl3_get_server_method(int ver)
143 {
144 if (ver == SSL3_VERSION)
145 return(SSLv3_server_method());
146 else
147 return(NULL);
148 }
149
150SSL_METHOD *SSLv3_server_method(void)
151 {
152 static int init=1;
153 static SSL_METHOD SSLv3_server_data;
154
155 if (init)
156 {
157 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
158
159 if (init)
160 {
161 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
162 sizeof(SSL_METHOD));
163 SSLv3_server_data.ssl_accept=ssl3_accept;
164 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
165 init=0;
166 }
167
168 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
169 }
170 return(&SSLv3_server_data);
171 }
172
173int ssl3_accept(SSL *s)
174 {
175 BUF_MEM *buf;
176 unsigned long l,Time=(unsigned long)time(NULL);
177 void (*cb)(const SSL *ssl,int type,int val)=NULL;
178 long num1;
179 int ret= -1;
180 int new_state,state,skip=0;
181
182 RAND_add(&Time,sizeof(Time),0);
183 ERR_clear_error();
184 clear_sys_error();
185
186 if (s->info_callback != NULL)
187 cb=s->info_callback;
188 else if (s->ctx->info_callback != NULL)
189 cb=s->ctx->info_callback;
190
191 /* init things to blank */
192 s->in_handshake++;
193 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
194
195 if (s->cert == NULL)
196 {
197 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
198 return(-1);
199 }
200
201 for (;;)
202 {
203 state=s->state;
204
205 switch (s->state)
206 {
207 case SSL_ST_RENEGOTIATE:
208 s->new_session=1;
209 /* s->state=SSL_ST_ACCEPT; */
210
211 case SSL_ST_BEFORE:
212 case SSL_ST_ACCEPT:
213 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
214 case SSL_ST_OK|SSL_ST_ACCEPT:
215
216 s->server=1;
217 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
218
219 if ((s->version>>8) != 3)
220 {
221 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
222 return -1;
223 }
224 s->type=SSL_ST_ACCEPT;
225
226 if (s->init_buf == NULL)
227 {
228 if ((buf=BUF_MEM_new()) == NULL)
229 {
230 ret= -1;
231 goto end;
232 }
233 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
234 {
235 ret= -1;
236 goto end;
237 }
238 s->init_buf=buf;
239 }
240
241 if (!ssl3_setup_buffers(s))
242 {
243 ret= -1;
244 goto end;
245 }
246
247 s->init_num=0;
248
249 if (s->state != SSL_ST_RENEGOTIATE)
250 {
251 /* Ok, we now need to push on a buffering BIO so that
252 * the output is sent in a way that TCP likes :-)
253 */
254 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
255
256 ssl3_init_finished_mac(s);
257 s->state=SSL3_ST_SR_CLNT_HELLO_A;
258 s->ctx->stats.sess_accept++;
259 }
260 else
261 {
262 /* s->state == SSL_ST_RENEGOTIATE,
263 * we will just send a HelloRequest */
264 s->ctx->stats.sess_accept_renegotiate++;
265 s->state=SSL3_ST_SW_HELLO_REQ_A;
266 }
267 break;
268
269 case SSL3_ST_SW_HELLO_REQ_A:
270 case SSL3_ST_SW_HELLO_REQ_B:
271
272 s->shutdown=0;
273 ret=ssl3_send_hello_request(s);
274 if (ret <= 0) goto end;
275 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
276 s->state=SSL3_ST_SW_FLUSH;
277 s->init_num=0;
278
279 ssl3_init_finished_mac(s);
280 break;
281
282 case SSL3_ST_SW_HELLO_REQ_C:
283 s->state=SSL_ST_OK;
284 break;
285
286 case SSL3_ST_SR_CLNT_HELLO_A:
287 case SSL3_ST_SR_CLNT_HELLO_B:
288 case SSL3_ST_SR_CLNT_HELLO_C:
289
290 s->shutdown=0;
291 ret=ssl3_get_client_hello(s);
292 if (ret <= 0) goto end;
293 s->new_session = 2;
294 s->state=SSL3_ST_SW_SRVR_HELLO_A;
295 s->init_num=0;
296 break;
297
298 case SSL3_ST_SW_SRVR_HELLO_A:
299 case SSL3_ST_SW_SRVR_HELLO_B:
300 ret=ssl3_send_server_hello(s);
301 if (ret <= 0) goto end;
302
303 if (s->hit)
304 s->state=SSL3_ST_SW_CHANGE_A;
305 else
306 s->state=SSL3_ST_SW_CERT_A;
307 s->init_num=0;
308 break;
309
310 case SSL3_ST_SW_CERT_A:
311 case SSL3_ST_SW_CERT_B:
312 /* Check if it is anon DH */
313 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
314 {
315 ret=ssl3_send_server_certificate(s);
316 if (ret <= 0) goto end;
317 }
318 else
319 skip=1;
320 s->state=SSL3_ST_SW_KEY_EXCH_A;
321 s->init_num=0;
322 break;
323
324 case SSL3_ST_SW_KEY_EXCH_A:
325 case SSL3_ST_SW_KEY_EXCH_B:
326 l=s->s3->tmp.new_cipher->algorithms;
327
328 /* clear this, it may get reset by
329 * send_server_key_exchange */
330 if ((s->options & SSL_OP_EPHEMERAL_RSA)
331#ifndef OPENSSL_NO_KRB5
332 && !(l & SSL_KRB5)
333#endif /* OPENSSL_NO_KRB5 */
334 )
335 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
336 * even when forbidden by protocol specs
337 * (handshake may fail as clients are not required to
338 * be able to handle this) */
339 s->s3->tmp.use_rsa_tmp=1;
340 else
341 s->s3->tmp.use_rsa_tmp=0;
342
343 /* only send if a DH key exchange, fortezza or
344 * RSA but we have a sign only certificate */
345 if (s->s3->tmp.use_rsa_tmp
346 || (l & (SSL_DH|SSL_kFZA))
347 || ((l & SSL_kRSA)
348 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
349 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
350 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
351 )
352 )
353 )
354 )
355 {
356 ret=ssl3_send_server_key_exchange(s);
357 if (ret <= 0) goto end;
358 }
359 else
360 skip=1;
361
362 s->state=SSL3_ST_SW_CERT_REQ_A;
363 s->init_num=0;
364 break;
365
366 case SSL3_ST_SW_CERT_REQ_A:
367 case SSL3_ST_SW_CERT_REQ_B:
368 if (/* don't request cert unless asked for it: */
369 !(s->verify_mode & SSL_VERIFY_PEER) ||
370 /* if SSL_VERIFY_CLIENT_ONCE is set,
371 * don't request cert during re-negotiation: */
372 ((s->session->peer != NULL) &&
373 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
374 /* never request cert in anonymous ciphersuites
375 * (see section "Certificate request" in SSL 3 drafts
376 * and in RFC 2246): */
377 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
378 /* ... except when the application insists on verification
379 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
380 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
381 /* never request cert in Kerberos ciphersuites */
382 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
383 {
384 /* no cert request */
385 skip=1;
386 s->s3->tmp.cert_request=0;
387 s->state=SSL3_ST_SW_SRVR_DONE_A;
388 }
389 else
390 {
391 s->s3->tmp.cert_request=1;
392 ret=ssl3_send_certificate_request(s);
393 if (ret <= 0) goto end;
394#ifndef NETSCAPE_HANG_BUG
395 s->state=SSL3_ST_SW_SRVR_DONE_A;
396#else
397 s->state=SSL3_ST_SW_FLUSH;
398 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
399#endif
400 s->init_num=0;
401 }
402 break;
403
404 case SSL3_ST_SW_SRVR_DONE_A:
405 case SSL3_ST_SW_SRVR_DONE_B:
406 ret=ssl3_send_server_done(s);
407 if (ret <= 0) goto end;
408 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
409 s->state=SSL3_ST_SW_FLUSH;
410 s->init_num=0;
411 break;
412
413 case SSL3_ST_SW_FLUSH:
414 /* number of bytes to be flushed */
415 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
416 if (num1 > 0)
417 {
418 s->rwstate=SSL_WRITING;
419 num1=BIO_flush(s->wbio);
420 if (num1 <= 0) { ret= -1; goto end; }
421 s->rwstate=SSL_NOTHING;
422 }
423
424 s->state=s->s3->tmp.next_state;
425 break;
426
427 case SSL3_ST_SR_CERT_A:
428 case SSL3_ST_SR_CERT_B:
429 /* Check for second client hello (MS SGC) */
430 ret = ssl3_check_client_hello(s);
431 if (ret <= 0)
432 goto end;
433 if (ret == 2)
434 s->state = SSL3_ST_SR_CLNT_HELLO_C;
435 else {
436 if (s->s3->tmp.cert_request)
437 {
438 ret=ssl3_get_client_certificate(s);
439 if (ret <= 0) goto end;
440 }
441 s->init_num=0;
442 s->state=SSL3_ST_SR_KEY_EXCH_A;
443 }
444 break;
445
446 case SSL3_ST_SR_KEY_EXCH_A:
447 case SSL3_ST_SR_KEY_EXCH_B:
448 ret=ssl3_get_client_key_exchange(s);
449 if (ret <= 0) goto end;
450 s->state=SSL3_ST_SR_CERT_VRFY_A;
451 s->init_num=0;
452
453 /* We need to get hashes here so if there is
454 * a client cert, it can be verified */
455 s->method->ssl3_enc->cert_verify_mac(s,
456 &(s->s3->finish_dgst1),
457 &(s->s3->tmp.cert_verify_md[0]));
458 s->method->ssl3_enc->cert_verify_mac(s,
459 &(s->s3->finish_dgst2),
460 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
461
462 break;
463
464 case SSL3_ST_SR_CERT_VRFY_A:
465 case SSL3_ST_SR_CERT_VRFY_B:
466
467 /* we should decide if we expected this one */
468 ret=ssl3_get_cert_verify(s);
469 if (ret <= 0) goto end;
470
471 s->state=SSL3_ST_SR_FINISHED_A;
472 s->init_num=0;
473 break;
474
475 case SSL3_ST_SR_FINISHED_A:
476 case SSL3_ST_SR_FINISHED_B:
477 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
478 SSL3_ST_SR_FINISHED_B);
479 if (ret <= 0) goto end;
480 if (s->hit)
481 s->state=SSL_ST_OK;
482 else
483 s->state=SSL3_ST_SW_CHANGE_A;
484 s->init_num=0;
485 break;
486
487 case SSL3_ST_SW_CHANGE_A:
488 case SSL3_ST_SW_CHANGE_B:
489
490 s->session->cipher=s->s3->tmp.new_cipher;
491 if (!s->method->ssl3_enc->setup_key_block(s))
492 { ret= -1; goto end; }
493
494 ret=ssl3_send_change_cipher_spec(s,
495 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
496
497 if (ret <= 0) goto end;
498 s->state=SSL3_ST_SW_FINISHED_A;
499 s->init_num=0;
500
501 if (!s->method->ssl3_enc->change_cipher_state(s,
502 SSL3_CHANGE_CIPHER_SERVER_WRITE))
503 {
504 ret= -1;
505 goto end;
506 }
507
508 break;
509
510 case SSL3_ST_SW_FINISHED_A:
511 case SSL3_ST_SW_FINISHED_B:
512 ret=ssl3_send_finished(s,
513 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
514 s->method->ssl3_enc->server_finished_label,
515 s->method->ssl3_enc->server_finished_label_len);
516 if (ret <= 0) goto end;
517 s->state=SSL3_ST_SW_FLUSH;
518 if (s->hit)
519 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
520 else
521 s->s3->tmp.next_state=SSL_ST_OK;
522 s->init_num=0;
523 break;
524
525 case SSL_ST_OK:
526 /* clean a few things up */
527 ssl3_cleanup_key_block(s);
528
529 BUF_MEM_free(s->init_buf);
530 s->init_buf=NULL;
531
532 /* remove buffering on output */
533 ssl_free_wbio_buffer(s);
534
535 s->init_num=0;
536
537 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
538 {
539 /* actually not necessarily a 'new' session unless
540 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
541
542 s->new_session=0;
543
544 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
545
546 s->ctx->stats.sess_accept_good++;
547 /* s->server=1; */
548 s->handshake_func=ssl3_accept;
549
550 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
551 }
552
553 ret = 1;
554 goto end;
555 /* break; */
556
557 default:
558 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
559 ret= -1;
560 goto end;
561 /* break; */
562 }
563
564 if (!s->s3->tmp.reuse_message && !skip)
565 {
566 if (s->debug)
567 {
568 if ((ret=BIO_flush(s->wbio)) <= 0)
569 goto end;
570 }
571
572
573 if ((cb != NULL) && (s->state != state))
574 {
575 new_state=s->state;
576 s->state=state;
577 cb(s,SSL_CB_ACCEPT_LOOP,1);
578 s->state=new_state;
579 }
580 }
581 skip=0;
582 }
583end:
584 /* BIO_flush(s->wbio); */
585
586 s->in_handshake--;
587 if (cb != NULL)
588 cb(s,SSL_CB_ACCEPT_EXIT,ret);
589 return(ret);
590 }
591
592static int ssl3_send_hello_request(SSL *s)
593 {
594 unsigned char *p;
595
596 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
597 {
598 p=(unsigned char *)s->init_buf->data;
599 *(p++)=SSL3_MT_HELLO_REQUEST;
600 *(p++)=0;
601 *(p++)=0;
602 *(p++)=0;
603
604 s->state=SSL3_ST_SW_HELLO_REQ_B;
605 /* number of bytes to write */
606 s->init_num=4;
607 s->init_off=0;
608 }
609
610 /* SSL3_ST_SW_HELLO_REQ_B */
611 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
612 }
613
614static int ssl3_check_client_hello(SSL *s)
615 {
616 int ok;
617 long n;
618
619 /* this function is called when we really expect a Certificate message,
620 * so permit appropriate message length */
621 n=ssl3_get_message(s,
622 SSL3_ST_SR_CERT_A,
623 SSL3_ST_SR_CERT_B,
624 -1,
625 s->max_cert_list,
626 &ok);
627 if (!ok) return((int)n);
628 s->s3->tmp.reuse_message = 1;
629 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
630 {
631 /* Throw away what we have done so far in the current handshake,
632 * which will now be aborted. (A full SSL_clear would be too much.)
633 * I hope that tmp.dh is the only thing that may need to be cleared
634 * when a handshake is not completed ... */
635#ifndef OPENSSL_NO_DH
636 if (s->s3->tmp.dh != NULL)
637 {
638 DH_free(s->s3->tmp.dh);
639 s->s3->tmp.dh = NULL;
640 }
641#endif
642 return 2;
643 }
644 return 1;
645}
646
647static int ssl3_get_client_hello(SSL *s)
648 {
649 int i,j,ok,al,ret= -1;
650 long n;
651 unsigned long id;
652 unsigned char *p,*d,*q;
653 SSL_CIPHER *c;
654 SSL_COMP *comp=NULL;
655 STACK_OF(SSL_CIPHER) *ciphers=NULL;
656
657 /* We do this so that we will respond with our native type.
658 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
659 * This down switching should be handled by a different method.
660 * If we are SSLv3, we will respond with SSLv3, even if prompted with
661 * TLSv1.
662 */
663 if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
664 {
665 s->first_packet=1;
666 s->state=SSL3_ST_SR_CLNT_HELLO_B;
667 }
668 n=ssl3_get_message(s,
669 SSL3_ST_SR_CLNT_HELLO_B,
670 SSL3_ST_SR_CLNT_HELLO_C,
671 SSL3_MT_CLIENT_HELLO,
672 SSL3_RT_MAX_PLAIN_LENGTH,
673 &ok);
674
675 if (!ok) return((int)n);
676 d=p=(unsigned char *)s->init_msg;
677
678 /* use version from inside client hello, not from record header
679 * (may differ: see RFC 2246, Appendix E, second paragraph) */
680 s->client_version=(((int)p[0])<<8)|(int)p[1];
681 p+=2;
682
683 if (s->client_version < s->version)
684 {
685 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
686 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
687 {
688 /* similar to ssl3_get_record, send alert using remote version number */
689 s->version = s->client_version;
690 }
691 al = SSL_AD_PROTOCOL_VERSION;
692 goto f_err;
693 }
694
695 /* load the client random */
696 memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
697 p+=SSL3_RANDOM_SIZE;
698
699 /* get the session-id */
700 j= *(p++);
701
702 s->hit=0;
703 /* Versions before 0.9.7 always allow session reuse during renegotiation
704 * (i.e. when s->new_session is true), option
705 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
706 * Maybe this optional behaviour should always have been the default,
707 * but we cannot safely change the default behaviour (or new applications
708 * might be written that become totally unsecure when compiled with
709 * an earlier library version)
710 */
711 if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
712 {
713 if (!ssl_get_new_session(s,1))
714 goto err;
715 }
716 else
717 {
718 i=ssl_get_prev_session(s,p,j);
719 if (i == 1)
720 { /* previous session */
721 s->hit=1;
722 }
723 else if (i == -1)
724 goto err;
725 else /* i == 0 */
726 {
727 if (!ssl_get_new_session(s,1))
728 goto err;
729 }
730 }
731
732 p+=j;
733 n2s(p,i);
734 if ((i == 0) && (j != 0))
735 {
736 /* we need a cipher if we are not resuming a session */
737 al=SSL_AD_ILLEGAL_PARAMETER;
738 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
739 goto f_err;
740 }
741 if ((p+i) >= (d+n))
742 {
743 /* not enough data */
744 al=SSL_AD_DECODE_ERROR;
745 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
746 goto f_err;
747 }
748 if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
749 == NULL))
750 {
751 goto err;
752 }
753 p+=i;
754
755 /* If it is a hit, check that the cipher is in the list */
756 if ((s->hit) && (i > 0))
757 {
758 j=0;
759 id=s->session->cipher->id;
760
761#ifdef CIPHER_DEBUG
762 printf("client sent %d ciphers\n",sk_num(ciphers));
763#endif
764 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
765 {
766 c=sk_SSL_CIPHER_value(ciphers,i);
767#ifdef CIPHER_DEBUG
768 printf("client [%2d of %2d]:%s\n",
769 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
770#endif
771 if (c->id == id)
772 {
773 j=1;
774 break;
775 }
776 }
777 if (j == 0)
778 {
779 if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
780 {
781 /* Very bad for multi-threading.... */
782 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
783 0);
784 }
785 else
786 {
787 /* we need to have the cipher in the cipher
788 * list if we are asked to reuse it */
789 al=SSL_AD_ILLEGAL_PARAMETER;
790 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
791 goto f_err;
792 }
793 }
794 }
795
796 /* compression */
797 i= *(p++);
798 if ((p+i) > (d+n))
799 {
800 /* not enough data */
801 al=SSL_AD_DECODE_ERROR;
802 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
803 goto f_err;
804 }
805 q=p;
806 for (j=0; j<i; j++)
807 {
808 if (p[j] == 0) break;
809 }
810
811 p+=i;
812 if (j >= i)
813 {
814 /* no compress */
815 al=SSL_AD_DECODE_ERROR;
816 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
817 goto f_err;
818 }
819
820 /* Worst case, we will use the NULL compression, but if we have other
821 * options, we will now look for them. We have i-1 compression
822 * algorithms from the client, starting at q. */
823 s->s3->tmp.new_compression=NULL;
824 if (s->ctx->comp_methods != NULL)
825 { /* See if we have a match */
826 int m,nn,o,v,done=0;
827
828 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
829 for (m=0; m<nn; m++)
830 {
831 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
832 v=comp->id;
833 for (o=0; o<i; o++)
834 {
835 if (v == q[o])
836 {
837 done=1;
838 break;
839 }
840 }
841 if (done) break;
842 }
843 if (done)
844 s->s3->tmp.new_compression=comp;
845 else
846 comp=NULL;
847 }
848
849 /* TLS does not mind if there is extra stuff */
850#if 0 /* SSL 3.0 does not mind either, so we should disable this test
851 * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
852 * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
853 if (s->version == SSL3_VERSION)
854 {
855 if (p < (d+n))
856 {
857 /* wrong number of bytes,
858 * there could be more to follow */
859 al=SSL_AD_DECODE_ERROR;
860 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
861 goto f_err;
862 }
863 }
864#endif
865
866 /* Given s->session->ciphers and SSL_get_ciphers, we must
867 * pick a cipher */
868
869 if (!s->hit)
870 {
871 s->session->compress_meth=(comp == NULL)?0:comp->id;
872 if (s->session->ciphers != NULL)
873 sk_SSL_CIPHER_free(s->session->ciphers);
874 s->session->ciphers=ciphers;
875 if (ciphers == NULL)
876 {
877 al=SSL_AD_ILLEGAL_PARAMETER;
878 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
879 goto f_err;
880 }
881 ciphers=NULL;
882 c=ssl3_choose_cipher(s,s->session->ciphers,
883 SSL_get_ciphers(s));
884
885 if (c == NULL)
886 {
887 al=SSL_AD_HANDSHAKE_FAILURE;
888 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
889 goto f_err;
890 }
891 s->s3->tmp.new_cipher=c;
892 }
893 else
894 {
895 /* Session-id reuse */
896#ifdef REUSE_CIPHER_BUG
897 STACK_OF(SSL_CIPHER) *sk;
898 SSL_CIPHER *nc=NULL;
899 SSL_CIPHER *ec=NULL;
900
901 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
902 {
903 sk=s->session->ciphers;
904 for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
905 {
906 c=sk_SSL_CIPHER_value(sk,i);
907 if (c->algorithms & SSL_eNULL)
908 nc=c;
909 if (SSL_C_IS_EXPORT(c))
910 ec=c;
911 }
912 if (nc != NULL)
913 s->s3->tmp.new_cipher=nc;
914 else if (ec != NULL)
915 s->s3->tmp.new_cipher=ec;
916 else
917 s->s3->tmp.new_cipher=s->session->cipher;
918 }
919 else
920#endif
921 s->s3->tmp.new_cipher=s->session->cipher;
922 }
923
924 /* we now have the following setup.
925 * client_random
926 * cipher_list - our prefered list of ciphers
927 * ciphers - the clients prefered list of ciphers
928 * compression - basically ignored right now
929 * ssl version is set - sslv3
930 * s->session - The ssl session has been setup.
931 * s->hit - session reuse flag
932 * s->tmp.new_cipher - the new cipher to use.
933 */
934
935 ret=1;
936 if (0)
937 {
938f_err:
939 ssl3_send_alert(s,SSL3_AL_FATAL,al);
940 }
941err:
942 if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
943 return(ret);
944 }
945
946static int ssl3_send_server_hello(SSL *s)
947 {
948 unsigned char *buf;
949 unsigned char *p,*d;
950 int i,sl;
951 unsigned long l,Time;
952
953 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
954 {
955 buf=(unsigned char *)s->init_buf->data;
956 p=s->s3->server_random;
957 Time=(unsigned long)time(NULL); /* Time */
958 l2n(Time,p);
959 if(RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
960 return -1;
961 /* Do the message type and length last */
962 d=p= &(buf[4]);
963
964 *(p++)=s->version>>8;
965 *(p++)=s->version&0xff;
966
967 /* Random stuff */
968 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
969 p+=SSL3_RANDOM_SIZE;
970
971 /* now in theory we have 3 options to sending back the
972 * session id. If it is a re-use, we send back the
973 * old session-id, if it is a new session, we send
974 * back the new session-id or we send back a 0 length
975 * session-id if we want it to be single use.
976 * Currently I will not implement the '0' length session-id
977 * 12-Jan-98 - I'll now support the '0' length stuff.
978 */
979 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
980 s->session->session_id_length=0;
981
982 sl=s->session->session_id_length;
983 if (sl > sizeof s->session->session_id)
984 {
985 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
986 return -1;
987 }
988 *(p++)=sl;
989 memcpy(p,s->session->session_id,sl);
990 p+=sl;
991
992 /* put the cipher */
993 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
994 p+=i;
995
996 /* put the compression method */
997 if (s->s3->tmp.new_compression == NULL)
998 *(p++)=0;
999 else
1000 *(p++)=s->s3->tmp.new_compression->id;
1001
1002 /* do the header */
1003 l=(p-d);
1004 d=buf;
1005 *(d++)=SSL3_MT_SERVER_HELLO;
1006 l2n3(l,d);
1007
1008 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1009 /* number of bytes to write */
1010 s->init_num=p-buf;
1011 s->init_off=0;
1012 }
1013
1014 /* SSL3_ST_CW_CLNT_HELLO_B */
1015 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1016 }
1017
1018static int ssl3_send_server_done(SSL *s)
1019 {
1020 unsigned char *p;
1021
1022 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1023 {
1024 p=(unsigned char *)s->init_buf->data;
1025
1026 /* do the header */
1027 *(p++)=SSL3_MT_SERVER_DONE;
1028 *(p++)=0;
1029 *(p++)=0;
1030 *(p++)=0;
1031
1032 s->state=SSL3_ST_SW_SRVR_DONE_B;
1033 /* number of bytes to write */
1034 s->init_num=4;
1035 s->init_off=0;
1036 }
1037
1038 /* SSL3_ST_CW_CLNT_HELLO_B */
1039 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1040 }
1041
1042static int ssl3_send_server_key_exchange(SSL *s)
1043 {
1044#ifndef OPENSSL_NO_RSA
1045 unsigned char *q;
1046 int j,num;
1047 RSA *rsa;
1048 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1049 unsigned int u;
1050#endif
1051#ifndef OPENSSL_NO_DH
1052 DH *dh=NULL,*dhp;
1053#endif
1054 EVP_PKEY *pkey;
1055 unsigned char *p,*d;
1056 int al,i;
1057 unsigned long type;
1058 int n;
1059 CERT *cert;
1060 BIGNUM *r[4];
1061 int nr[4],kn;
1062 BUF_MEM *buf;
1063 EVP_MD_CTX md_ctx;
1064
1065 EVP_MD_CTX_init(&md_ctx);
1066 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1067 {
1068 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1069 cert=s->cert;
1070
1071 buf=s->init_buf;
1072
1073 r[0]=r[1]=r[2]=r[3]=NULL;
1074 n=0;
1075#ifndef OPENSSL_NO_RSA
1076 if (type & SSL_kRSA)
1077 {
1078 rsa=cert->rsa_tmp;
1079 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1080 {
1081 rsa=s->cert->rsa_tmp_cb(s,
1082 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1083 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1084 if(rsa == NULL)
1085 {
1086 al=SSL_AD_HANDSHAKE_FAILURE;
1087 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1088 goto f_err;
1089 }
1090 RSA_up_ref(rsa);
1091 cert->rsa_tmp=rsa;
1092 }
1093 if (rsa == NULL)
1094 {
1095 al=SSL_AD_HANDSHAKE_FAILURE;
1096 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1097 goto f_err;
1098 }
1099 r[0]=rsa->n;
1100 r[1]=rsa->e;
1101 s->s3->tmp.use_rsa_tmp=1;
1102 }
1103 else
1104#endif
1105#ifndef OPENSSL_NO_DH
1106 if (type & SSL_kEDH)
1107 {
1108 dhp=cert->dh_tmp;
1109 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1110 dhp=s->cert->dh_tmp_cb(s,
1111 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1112 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1113 if (dhp == NULL)
1114 {
1115 al=SSL_AD_HANDSHAKE_FAILURE;
1116 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1117 goto f_err;
1118 }
1119
1120 if (s->s3->tmp.dh != NULL)
1121 {
1122 DH_free(dh);
1123 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1124 goto err;
1125 }
1126
1127 if ((dh=DHparams_dup(dhp)) == NULL)
1128 {
1129 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1130 goto err;
1131 }
1132
1133 s->s3->tmp.dh=dh;
1134 if ((dhp->pub_key == NULL ||
1135 dhp->priv_key == NULL ||
1136 (s->options & SSL_OP_SINGLE_DH_USE)))
1137 {
1138 if(!DH_generate_key(dh))
1139 {
1140 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1141 ERR_R_DH_LIB);
1142 goto err;
1143 }
1144 }
1145 else
1146 {
1147 dh->pub_key=BN_dup(dhp->pub_key);
1148 dh->priv_key=BN_dup(dhp->priv_key);
1149 if ((dh->pub_key == NULL) ||
1150 (dh->priv_key == NULL))
1151 {
1152 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1153 goto err;
1154 }
1155 }
1156 r[0]=dh->p;
1157 r[1]=dh->g;
1158 r[2]=dh->pub_key;
1159 }
1160 else
1161#endif
1162 {
1163 al=SSL_AD_HANDSHAKE_FAILURE;
1164 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1165 goto f_err;
1166 }
1167 for (i=0; r[i] != NULL; i++)
1168 {
1169 nr[i]=BN_num_bytes(r[i]);
1170 n+=2+nr[i];
1171 }
1172
1173 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1174 {
1175 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1176 == NULL)
1177 {
1178 al=SSL_AD_DECODE_ERROR;
1179 goto f_err;
1180 }
1181 kn=EVP_PKEY_size(pkey);
1182 }
1183 else
1184 {
1185 pkey=NULL;
1186 kn=0;
1187 }
1188
1189 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1190 {
1191 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1192 goto err;
1193 }
1194 d=(unsigned char *)s->init_buf->data;
1195 p= &(d[4]);
1196
1197 for (i=0; r[i] != NULL; i++)
1198 {
1199 s2n(nr[i],p);
1200 BN_bn2bin(r[i],p);
1201 p+=nr[i];
1202 }
1203
1204 /* not anonymous */
1205 if (pkey != NULL)
1206 {
1207 /* n is the length of the params, they start at &(d[4])
1208 * and p points to the space at the end. */
1209#ifndef OPENSSL_NO_RSA
1210 if (pkey->type == EVP_PKEY_RSA)
1211 {
1212 q=md_buf;
1213 j=0;
1214 for (num=2; num > 0; num--)
1215 {
1216 EVP_MD_CTX_set_flags(&md_ctx,
1217 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1218 EVP_DigestInit_ex(&md_ctx,(num == 2)
1219 ?s->ctx->md5:s->ctx->sha1, NULL);
1220 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1221 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1222 EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1223 EVP_DigestFinal_ex(&md_ctx,q,
1224 (unsigned int *)&i);
1225 q+=i;
1226 j+=i;
1227 }
1228 if (RSA_sign(NID_md5_sha1, md_buf, j,
1229 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1230 {
1231 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1232 goto err;
1233 }
1234 s2n(u,p);
1235 n+=u+2;
1236 }
1237 else
1238#endif
1239#if !defined(OPENSSL_NO_DSA)
1240 if (pkey->type == EVP_PKEY_DSA)
1241 {
1242 /* lets do DSS */
1243 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1244 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1245 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1246 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1247 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1248 (unsigned int *)&i,pkey))
1249 {
1250 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1251 goto err;
1252 }
1253 s2n(i,p);
1254 n+=i+2;
1255 }
1256 else
1257#endif
1258 {
1259 /* Is this error check actually needed? */
1260 al=SSL_AD_HANDSHAKE_FAILURE;
1261 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1262 goto f_err;
1263 }
1264 }
1265
1266 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1267 l2n3(n,d);
1268
1269 /* we should now have things packed up, so lets send
1270 * it off */
1271 s->init_num=n+4;
1272 s->init_off=0;
1273 }
1274
1275 s->state = SSL3_ST_SW_KEY_EXCH_B;
1276 EVP_MD_CTX_cleanup(&md_ctx);
1277 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1278f_err:
1279 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1280err:
1281 EVP_MD_CTX_cleanup(&md_ctx);
1282 return(-1);
1283 }
1284
1285static int ssl3_send_certificate_request(SSL *s)
1286 {
1287 unsigned char *p,*d;
1288 int i,j,nl,off,n;
1289 STACK_OF(X509_NAME) *sk=NULL;
1290 X509_NAME *name;
1291 BUF_MEM *buf;
1292
1293 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1294 {
1295 buf=s->init_buf;
1296
1297 d=p=(unsigned char *)&(buf->data[4]);
1298
1299 /* get the list of acceptable cert types */
1300 p++;
1301 n=ssl3_get_req_cert_type(s,p);
1302 d[0]=n;
1303 p+=n;
1304 n++;
1305
1306 off=n;
1307 p+=2;
1308 n+=2;
1309
1310 sk=SSL_get_client_CA_list(s);
1311 nl=0;
1312 if (sk != NULL)
1313 {
1314 for (i=0; i<sk_X509_NAME_num(sk); i++)
1315 {
1316 name=sk_X509_NAME_value(sk,i);
1317 j=i2d_X509_NAME(name,NULL);
1318 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1319 {
1320 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1321 goto err;
1322 }
1323 p=(unsigned char *)&(buf->data[4+n]);
1324 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1325 {
1326 s2n(j,p);
1327 i2d_X509_NAME(name,&p);
1328 n+=2+j;
1329 nl+=2+j;
1330 }
1331 else
1332 {
1333 d=p;
1334 i2d_X509_NAME(name,&p);
1335 j-=2; s2n(j,d); j+=2;
1336 n+=j;
1337 nl+=j;
1338 }
1339 }
1340 }
1341 /* else no CA names */
1342 p=(unsigned char *)&(buf->data[4+off]);
1343 s2n(nl,p);
1344
1345 d=(unsigned char *)buf->data;
1346 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1347 l2n3(n,d);
1348
1349 /* we should now have things packed up, so lets send
1350 * it off */
1351
1352 s->init_num=n+4;
1353 s->init_off=0;
1354#ifdef NETSCAPE_HANG_BUG
1355 p=(unsigned char *)s->init_buf->data + s->init_num;
1356
1357 /* do the header */
1358 *(p++)=SSL3_MT_SERVER_DONE;
1359 *(p++)=0;
1360 *(p++)=0;
1361 *(p++)=0;
1362 s->init_num += 4;
1363#endif
1364
1365 s->state = SSL3_ST_SW_CERT_REQ_B;
1366 }
1367
1368 /* SSL3_ST_SW_CERT_REQ_B */
1369 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1370err:
1371 return(-1);
1372 }
1373
1374static int ssl3_get_client_key_exchange(SSL *s)
1375 {
1376 int i,al,ok;
1377 long n;
1378 unsigned long l;
1379 unsigned char *p;
1380#ifndef OPENSSL_NO_RSA
1381 RSA *rsa=NULL;
1382 EVP_PKEY *pkey=NULL;
1383#endif
1384#ifndef OPENSSL_NO_DH
1385 BIGNUM *pub=NULL;
1386 DH *dh_srvr;
1387#endif
1388#ifndef OPENSSL_NO_KRB5
1389 KSSL_ERR kssl_err;
1390#endif /* OPENSSL_NO_KRB5 */
1391
1392 n=ssl3_get_message(s,
1393 SSL3_ST_SR_KEY_EXCH_A,
1394 SSL3_ST_SR_KEY_EXCH_B,
1395 SSL3_MT_CLIENT_KEY_EXCHANGE,
1396 2048, /* ??? */
1397 &ok);
1398
1399 if (!ok) return((int)n);
1400 p=(unsigned char *)s->init_msg;
1401
1402 l=s->s3->tmp.new_cipher->algorithms;
1403
1404#ifndef OPENSSL_NO_RSA
1405 if (l & SSL_kRSA)
1406 {
1407 /* FIX THIS UP EAY EAY EAY EAY */
1408 if (s->s3->tmp.use_rsa_tmp)
1409 {
1410 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1411 rsa=s->cert->rsa_tmp;
1412 /* Don't do a callback because rsa_tmp should
1413 * be sent already */
1414 if (rsa == NULL)
1415 {
1416 al=SSL_AD_HANDSHAKE_FAILURE;
1417 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1418 goto f_err;
1419
1420 }
1421 }
1422 else
1423 {
1424 pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1425 if ( (pkey == NULL) ||
1426 (pkey->type != EVP_PKEY_RSA) ||
1427 (pkey->pkey.rsa == NULL))
1428 {
1429 al=SSL_AD_HANDSHAKE_FAILURE;
1430 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1431 goto f_err;
1432 }
1433 rsa=pkey->pkey.rsa;
1434 }
1435
1436 /* TLS */
1437 if (s->version > SSL3_VERSION)
1438 {
1439 n2s(p,i);
1440 if (n != i+2)
1441 {
1442 if (!(s->options & SSL_OP_TLS_D5_BUG))
1443 {
1444 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1445 goto err;
1446 }
1447 else
1448 p-=2;
1449 }
1450 else
1451 n=i;
1452 }
1453
1454 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1455
1456 al = -1;
1457
1458 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1459 {
1460 al=SSL_AD_DECODE_ERROR;
1461 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1462 }
1463
1464 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1465 {
1466 /* The premaster secret must contain the same version number as the
1467 * ClientHello to detect version rollback attacks (strangely, the
1468 * protocol does not offer such protection for DH ciphersuites).
1469 * However, buggy clients exist that send the negotiated protocol
1470 * version instead if the server does not support the requested
1471 * protocol version.
1472 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1473 if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1474 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1475 {
1476 al=SSL_AD_DECODE_ERROR;
1477 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1478
1479 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1480 * (http://eprint.iacr.org/2003/052/) exploits the version
1481 * number check as a "bad version oracle" -- an alert would
1482 * reveal that the plaintext corresponding to some ciphertext
1483 * made up by the adversary is properly formatted except
1484 * that the version number is wrong. To avoid such attacks,
1485 * we should treat this just like any other decryption error. */
1486 }
1487 }
1488
1489 if (al != -1)
1490 {
1491 /* Some decryption failure -- use random value instead as countermeasure
1492 * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1493 * (see RFC 2246, section 7.4.7.1). */
1494 ERR_clear_error();
1495 i = SSL_MAX_MASTER_KEY_LENGTH;
1496 p[0] = s->client_version >> 8;
1497 p[1] = s->client_version & 0xff;
1498 if(RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1499 goto err;
1500 }
1501
1502 s->session->master_key_length=
1503 s->method->ssl3_enc->generate_master_secret(s,
1504 s->session->master_key,
1505 p,i);
1506 OPENSSL_cleanse(p,i);
1507 }
1508 else
1509#endif
1510#ifndef OPENSSL_NO_DH
1511 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1512 {
1513 n2s(p,i);
1514 if (n != i+2)
1515 {
1516 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1517 {
1518 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1519 goto err;
1520 }
1521 else
1522 {
1523 p-=2;
1524 i=(int)n;
1525 }
1526 }
1527
1528 if (n == 0L) /* the parameters are in the cert */
1529 {
1530 al=SSL_AD_HANDSHAKE_FAILURE;
1531 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1532 goto f_err;
1533 }
1534 else
1535 {
1536 if (s->s3->tmp.dh == NULL)
1537 {
1538 al=SSL_AD_HANDSHAKE_FAILURE;
1539 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1540 goto f_err;
1541 }
1542 else
1543 dh_srvr=s->s3->tmp.dh;
1544 }
1545
1546 pub=BN_bin2bn(p,i,NULL);
1547 if (pub == NULL)
1548 {
1549 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1550 goto err;
1551 }
1552
1553 i=DH_compute_key(p,pub,dh_srvr);
1554
1555 if (i <= 0)
1556 {
1557 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1558 goto err;
1559 }
1560
1561 DH_free(s->s3->tmp.dh);
1562 s->s3->tmp.dh=NULL;
1563
1564 BN_clear_free(pub);
1565 pub=NULL;
1566 s->session->master_key_length=
1567 s->method->ssl3_enc->generate_master_secret(s,
1568 s->session->master_key,p,i);
1569 OPENSSL_cleanse(p,i);
1570 }
1571 else
1572#endif
1573#ifndef OPENSSL_NO_KRB5
1574 if (l & SSL_kKRB5)
1575 {
1576 krb5_error_code krb5rc;
1577 krb5_data enc_ticket;
1578 krb5_data authenticator;
1579 krb5_data enc_pms;
1580 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1581 EVP_CIPHER_CTX ciph_ctx;
1582 EVP_CIPHER *enc = NULL;
1583 unsigned char iv[EVP_MAX_IV_LENGTH];
1584 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH
1585 + EVP_MAX_BLOCK_LENGTH];
1586 int padl, outl;
1587 krb5_timestamp authtime = 0;
1588 krb5_ticket_times ttimes;
1589
1590 EVP_CIPHER_CTX_init(&ciph_ctx);
1591
1592 if (!kssl_ctx) kssl_ctx = kssl_ctx_new();
1593
1594 n2s(p,i);
1595 enc_ticket.length = i;
1596
1597 if (n < (long)enc_ticket.length + 6)
1598 {
1599 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1600 SSL_R_DATA_LENGTH_TOO_LONG);
1601 goto err;
1602 }
1603
1604 enc_ticket.data = (char *)p;
1605 p+=enc_ticket.length;
1606
1607 n2s(p,i);
1608 authenticator.length = i;
1609
1610 if (n < (long)(enc_ticket.length + authenticator.length + 6))
1611 {
1612 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1613 SSL_R_DATA_LENGTH_TOO_LONG);
1614 goto err;
1615 }
1616
1617 authenticator.data = (char *)p;
1618 p+=authenticator.length;
1619
1620 n2s(p,i);
1621 enc_pms.length = i;
1622 enc_pms.data = (char *)p;
1623 p+=enc_pms.length;
1624
1625 /* Note that the length is checked again below,
1626 ** after decryption
1627 */
1628 if(enc_pms.length > sizeof pms)
1629 {
1630 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1631 SSL_R_DATA_LENGTH_TOO_LONG);
1632 goto err;
1633 }
1634
1635 if (n != (long)(enc_ticket.length + authenticator.length +
1636 enc_pms.length + 6))
1637 {
1638 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1639 SSL_R_DATA_LENGTH_TOO_LONG);
1640 goto err;
1641 }
1642
1643 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1644 &kssl_err)) != 0)
1645 {
1646#ifdef KSSL_DEBUG
1647 printf("kssl_sget_tkt rtn %d [%d]\n",
1648 krb5rc, kssl_err.reason);
1649 if (kssl_err.text)
1650 printf("kssl_err text= %s\n", kssl_err.text);
1651#endif /* KSSL_DEBUG */
1652 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1653 kssl_err.reason);
1654 goto err;
1655 }
1656
1657 /* Note: no authenticator is not considered an error,
1658 ** but will return authtime == 0.
1659 */
1660 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1661 &authtime, &kssl_err)) != 0)
1662 {
1663#ifdef KSSL_DEBUG
1664 printf("kssl_check_authent rtn %d [%d]\n",
1665 krb5rc, kssl_err.reason);
1666 if (kssl_err.text)
1667 printf("kssl_err text= %s\n", kssl_err.text);
1668#endif /* KSSL_DEBUG */
1669 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1670 kssl_err.reason);
1671 goto err;
1672 }
1673
1674 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1675 {
1676 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc);
1677 goto err;
1678 }
1679
1680#ifdef KSSL_DEBUG
1681 kssl_ctx_show(kssl_ctx);
1682#endif /* KSSL_DEBUG */
1683
1684 enc = kssl_map_enc(kssl_ctx->enctype);
1685 if (enc == NULL)
1686 goto err;
1687
1688 memset(iv, 0, sizeof iv); /* per RFC 1510 */
1689
1690 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1691 {
1692 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1693 SSL_R_DECRYPTION_FAILED);
1694 goto err;
1695 }
1696 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1697 (unsigned char *)enc_pms.data, enc_pms.length))
1698 {
1699 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1700 SSL_R_DECRYPTION_FAILED);
1701 goto err;
1702 }
1703 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1704 {
1705 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1706 SSL_R_DATA_LENGTH_TOO_LONG);
1707 goto err;
1708 }
1709 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1710 {
1711 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1712 SSL_R_DECRYPTION_FAILED);
1713 goto err;
1714 }
1715 outl += padl;
1716 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1717 {
1718 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1719 SSL_R_DATA_LENGTH_TOO_LONG);
1720 goto err;
1721 }
1722 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1723
1724 s->session->master_key_length=
1725 s->method->ssl3_enc->generate_master_secret(s,
1726 s->session->master_key, pms, outl);
1727
1728 if (kssl_ctx->client_princ)
1729 {
1730 int len = strlen(kssl_ctx->client_princ);
1731 if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
1732 {
1733 s->session->krb5_client_princ_len = len;
1734 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
1735 }
1736 }
1737
1738
1739 /* Was doing kssl_ctx_free() here,
1740 ** but it caused problems for apache.
1741 ** kssl_ctx = kssl_ctx_free(kssl_ctx);
1742 ** if (s->kssl_ctx) s->kssl_ctx = NULL;
1743 */
1744 }
1745 else
1746#endif /* OPENSSL_NO_KRB5 */
1747 {
1748 al=SSL_AD_HANDSHAKE_FAILURE;
1749 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1750 SSL_R_UNKNOWN_CIPHER_TYPE);
1751 goto f_err;
1752 }
1753
1754 return(1);
1755f_err:
1756 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1757#if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA)
1758err:
1759#endif
1760 return(-1);
1761 }
1762
1763static int ssl3_get_cert_verify(SSL *s)
1764 {
1765 EVP_PKEY *pkey=NULL;
1766 unsigned char *p;
1767 int al,ok,ret=0;
1768 long n;
1769 int type=0,i,j;
1770 X509 *peer;
1771
1772 n=ssl3_get_message(s,
1773 SSL3_ST_SR_CERT_VRFY_A,
1774 SSL3_ST_SR_CERT_VRFY_B,
1775 -1,
1776 514, /* 514? */
1777 &ok);
1778
1779 if (!ok) return((int)n);
1780
1781 if (s->session->peer != NULL)
1782 {
1783 peer=s->session->peer;
1784 pkey=X509_get_pubkey(peer);
1785 type=X509_certificate_type(peer,pkey);
1786 }
1787 else
1788 {
1789 peer=NULL;
1790 pkey=NULL;
1791 }
1792
1793 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1794 {
1795 s->s3->tmp.reuse_message=1;
1796 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1797 {
1798 al=SSL_AD_UNEXPECTED_MESSAGE;
1799 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1800 goto f_err;
1801 }
1802 ret=1;
1803 goto end;
1804 }
1805
1806 if (peer == NULL)
1807 {
1808 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1809 al=SSL_AD_UNEXPECTED_MESSAGE;
1810 goto f_err;
1811 }
1812
1813 if (!(type & EVP_PKT_SIGN))
1814 {
1815 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1816 al=SSL_AD_ILLEGAL_PARAMETER;
1817 goto f_err;
1818 }
1819
1820 if (s->s3->change_cipher_spec)
1821 {
1822 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1823 al=SSL_AD_UNEXPECTED_MESSAGE;
1824 goto f_err;
1825 }
1826
1827 /* we now have a signature that we need to verify */
1828 p=(unsigned char *)s->init_msg;
1829 n2s(p,i);
1830 n-=2;
1831 if (i > n)
1832 {
1833 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1834 al=SSL_AD_DECODE_ERROR;
1835 goto f_err;
1836 }
1837
1838 j=EVP_PKEY_size(pkey);
1839 if ((i > j) || (n > j) || (n <= 0))
1840 {
1841 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1842 al=SSL_AD_DECODE_ERROR;
1843 goto f_err;
1844 }
1845
1846#ifndef OPENSSL_NO_RSA
1847 if (pkey->type == EVP_PKEY_RSA)
1848 {
1849 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1850 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1851 pkey->pkey.rsa);
1852 if (i < 0)
1853 {
1854 al=SSL_AD_DECRYPT_ERROR;
1855 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1856 goto f_err;
1857 }
1858 if (i == 0)
1859 {
1860 al=SSL_AD_DECRYPT_ERROR;
1861 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1862 goto f_err;
1863 }
1864 }
1865 else
1866#endif
1867#ifndef OPENSSL_NO_DSA
1868 if (pkey->type == EVP_PKEY_DSA)
1869 {
1870 j=DSA_verify(pkey->save_type,
1871 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1872 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1873 if (j <= 0)
1874 {
1875 /* bad signature */
1876 al=SSL_AD_DECRYPT_ERROR;
1877 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1878 goto f_err;
1879 }
1880 }
1881 else
1882#endif
1883 {
1884 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
1885 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1886 goto f_err;
1887 }
1888
1889
1890 ret=1;
1891 if (0)
1892 {
1893f_err:
1894 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1895 }
1896end:
1897 EVP_PKEY_free(pkey);
1898 return(ret);
1899 }
1900
1901static int ssl3_get_client_certificate(SSL *s)
1902 {
1903 int i,ok,al,ret= -1;
1904 X509 *x=NULL;
1905 unsigned long l,nc,llen,n;
1906 unsigned char *p,*d,*q;
1907 STACK_OF(X509) *sk=NULL;
1908
1909 n=ssl3_get_message(s,
1910 SSL3_ST_SR_CERT_A,
1911 SSL3_ST_SR_CERT_B,
1912 -1,
1913 s->max_cert_list,
1914 &ok);
1915
1916 if (!ok) return((int)n);
1917
1918 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1919 {
1920 if ( (s->verify_mode & SSL_VERIFY_PEER) &&
1921 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1922 {
1923 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1924 al=SSL_AD_HANDSHAKE_FAILURE;
1925 goto f_err;
1926 }
1927 /* If tls asked for a client cert, the client must return a 0 list */
1928 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1929 {
1930 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1931 al=SSL_AD_UNEXPECTED_MESSAGE;
1932 goto f_err;
1933 }
1934 s->s3->tmp.reuse_message=1;
1935 return(1);
1936 }
1937
1938 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1939 {
1940 al=SSL_AD_UNEXPECTED_MESSAGE;
1941 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1942 goto f_err;
1943 }
1944 d=p=(unsigned char *)s->init_msg;
1945
1946 if ((sk=sk_X509_new_null()) == NULL)
1947 {
1948 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1949 goto err;
1950 }
1951
1952 n2l3(p,llen);
1953 if (llen+3 != n)
1954 {
1955 al=SSL_AD_DECODE_ERROR;
1956 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1957 goto f_err;
1958 }
1959 for (nc=0; nc<llen; )
1960 {
1961 n2l3(p,l);
1962 if ((l+nc+3) > llen)
1963 {
1964 al=SSL_AD_DECODE_ERROR;
1965 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1966 goto f_err;
1967 }
1968
1969 q=p;
1970 x=d2i_X509(NULL,&p,l);
1971 if (x == NULL)
1972 {
1973 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1974 goto err;
1975 }
1976 if (p != (q+l))
1977 {
1978 al=SSL_AD_DECODE_ERROR;
1979 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1980 goto f_err;
1981 }
1982 if (!sk_X509_push(sk,x))
1983 {
1984 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1985 goto err;
1986 }
1987 x=NULL;
1988 nc+=l+3;
1989 }
1990
1991 if (sk_X509_num(sk) <= 0)
1992 {
1993 /* TLS does not mind 0 certs returned */
1994 if (s->version == SSL3_VERSION)
1995 {
1996 al=SSL_AD_HANDSHAKE_FAILURE;
1997 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1998 goto f_err;
1999 }
2000 /* Fail for TLS only if we required a certificate */
2001 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2002 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2003 {
2004 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2005 al=SSL_AD_HANDSHAKE_FAILURE;
2006 goto f_err;
2007 }
2008 }
2009 else
2010 {
2011 i=ssl_verify_cert_chain(s,sk);
2012 if (!i)
2013 {
2014 al=ssl_verify_alarm_type(s->verify_result);
2015 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2016 goto f_err;
2017 }
2018 }
2019
2020 if (s->session->peer != NULL) /* This should not be needed */
2021 X509_free(s->session->peer);
2022 s->session->peer=sk_X509_shift(sk);
2023 s->session->verify_result = s->verify_result;
2024
2025 /* With the current implementation, sess_cert will always be NULL
2026 * when we arrive here. */
2027 if (s->session->sess_cert == NULL)
2028 {
2029 s->session->sess_cert = ssl_sess_cert_new();
2030 if (s->session->sess_cert == NULL)
2031 {
2032 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2033 goto err;
2034 }
2035 }
2036 if (s->session->sess_cert->cert_chain != NULL)
2037 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2038 s->session->sess_cert->cert_chain=sk;
2039 /* Inconsistency alert: cert_chain does *not* include the
2040 * peer's own certificate, while we do include it in s3_clnt.c */
2041
2042 sk=NULL;
2043
2044 ret=1;
2045 if (0)
2046 {
2047f_err:
2048 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2049 }
2050err:
2051 if (x != NULL) X509_free(x);
2052 if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2053 return(ret);
2054 }
2055
2056int ssl3_send_server_certificate(SSL *s)
2057 {
2058 unsigned long l;
2059 X509 *x;
2060
2061 if (s->state == SSL3_ST_SW_CERT_A)
2062 {
2063 x=ssl_get_server_send_cert(s);
2064 if (x == NULL &&
2065 /* VRS: allow null cert if auth == KRB5 */
2066 (s->s3->tmp.new_cipher->algorithms
2067 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2068 != (SSL_aKRB5|SSL_kKRB5))
2069 {
2070 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2071 return(0);
2072 }
2073
2074 l=ssl3_output_cert_chain(s,x);
2075 s->state=SSL3_ST_SW_CERT_B;
2076 s->init_num=(int)l;
2077 s->init_off=0;
2078 }
2079
2080 /* SSL3_ST_SW_CERT_B */
2081 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2082 }
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-10-27 14:51:36 +0000