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[thirdparty/openssl.git] / ssl / s3_srvr.c
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 #include <openssl/krb5_asn.h>
125 #include <openssl/md5.h>
126
127 static SSL_METHOD *ssl3_get_server_method(int ver);
128 static int ssl3_get_client_hello(SSL *s);
129 static int ssl3_check_client_hello(SSL *s);
130 static int ssl3_send_server_hello(SSL *s);
131 static int ssl3_send_server_key_exchange(SSL *s);
132 static int ssl3_send_certificate_request(SSL *s);
133 static int ssl3_send_server_done(SSL *s);
134 static int ssl3_get_client_key_exchange(SSL *s);
135 static int ssl3_get_client_certificate(SSL *s);
136 static int ssl3_get_cert_verify(SSL *s);
137 static int ssl3_send_hello_request(SSL *s);
138
139 static 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
147 SSL_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
163 int ssl3_accept(SSL *s)
164 {
165 BUF_MEM *buf;
166 unsigned long l,Time=time(NULL);
167 void (*cb)(const SSL *ssl,int type,int val)=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, ERR_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 #ifndef OPENSSL_NO_KRB5
322 && !(l & SSL_KRB5)
323 #endif /* OPENSSL_NO_KRB5 */
324 )
325 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
326 * even when forbidden by protocol specs
327 * (handshake may fail as clients are not required to
328 * be able to handle this) */
329 s->s3->tmp.use_rsa_tmp=1;
330 else
331 s->s3->tmp.use_rsa_tmp=0;
332
333 /* only send if a DH key exchange, fortezza or
334 * RSA but we have a sign only certificate */
335 if (s->s3->tmp.use_rsa_tmp
336 || (l & (SSL_DH|SSL_kFZA))
337 || ((l & SSL_kRSA)
338 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
339 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
340 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
341 )
342 )
343 )
344 )
345 {
346 ret=ssl3_send_server_key_exchange(s);
347 if (ret <= 0) goto end;
348 }
349 else
350 skip=1;
351
352 s->state=SSL3_ST_SW_CERT_REQ_A;
353 s->init_num=0;
354 break;
355
356 case SSL3_ST_SW_CERT_REQ_A:
357 case SSL3_ST_SW_CERT_REQ_B:
358 if (/* don't request cert unless asked for it: */
359 !(s->verify_mode & SSL_VERIFY_PEER) ||
360 /* if SSL_VERIFY_CLIENT_ONCE is set,
361 * don't request cert during re-negotiation: */
362 ((s->session->peer != NULL) &&
363 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
364 /* never request cert in anonymous ciphersuites
365 * (see section "Certificate request" in SSL 3 drafts
366 * and in RFC 2246): */
367 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
368 /* ... except when the application insists on verification
369 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
370 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
371 /* never request cert in Kerberos ciphersuites */
372 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
373 {
374 /* no cert request */
375 skip=1;
376 s->s3->tmp.cert_request=0;
377 s->state=SSL3_ST_SW_SRVR_DONE_A;
378 }
379 else
380 {
381 s->s3->tmp.cert_request=1;
382 ret=ssl3_send_certificate_request(s);
383 if (ret <= 0) goto end;
384 #ifndef NETSCAPE_HANG_BUG
385 s->state=SSL3_ST_SW_SRVR_DONE_A;
386 #else
387 s->state=SSL3_ST_SW_FLUSH;
388 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
389 #endif
390 s->init_num=0;
391 }
392 break;
393
394 case SSL3_ST_SW_SRVR_DONE_A:
395 case SSL3_ST_SW_SRVR_DONE_B:
396 ret=ssl3_send_server_done(s);
397 if (ret <= 0) goto end;
398 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
399 s->state=SSL3_ST_SW_FLUSH;
400 s->init_num=0;
401 break;
402
403 case SSL3_ST_SW_FLUSH:
404 /* number of bytes to be flushed */
405 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
406 if (num1 > 0)
407 {
408 s->rwstate=SSL_WRITING;
409 num1=BIO_flush(s->wbio);
410 if (num1 <= 0) { ret= -1; goto end; }
411 s->rwstate=SSL_NOTHING;
412 }
413
414 s->state=s->s3->tmp.next_state;
415 break;
416
417 case SSL3_ST_SR_CERT_A:
418 case SSL3_ST_SR_CERT_B:
419 /* Check for second client hello (MS SGC) */
420 ret = ssl3_check_client_hello(s);
421 if (ret <= 0)
422 goto end;
423 if (ret == 2)
424 s->state = SSL3_ST_SR_CLNT_HELLO_C;
425 else {
426 /* could be sent for a DH cert, even if we
427 * have not asked for it :-) */
428 ret=ssl3_get_client_certificate(s);
429 if (ret <= 0) goto end;
430 s->init_num=0;
431 s->state=SSL3_ST_SR_KEY_EXCH_A;
432 }
433 break;
434
435 case SSL3_ST_SR_KEY_EXCH_A:
436 case SSL3_ST_SR_KEY_EXCH_B:
437 ret=ssl3_get_client_key_exchange(s);
438 if (ret <= 0) goto end;
439 s->state=SSL3_ST_SR_CERT_VRFY_A;
440 s->init_num=0;
441
442 /* We need to get hashes here so if there is
443 * a client cert, it can be verified */
444 s->method->ssl3_enc->cert_verify_mac(s,
445 &(s->s3->finish_dgst1),
446 &(s->s3->tmp.cert_verify_md[0]));
447 s->method->ssl3_enc->cert_verify_mac(s,
448 &(s->s3->finish_dgst2),
449 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
450
451 break;
452
453 case SSL3_ST_SR_CERT_VRFY_A:
454 case SSL3_ST_SR_CERT_VRFY_B:
455
456 /* we should decide if we expected this one */
457 ret=ssl3_get_cert_verify(s);
458 if (ret <= 0) goto end;
459
460 s->state=SSL3_ST_SR_FINISHED_A;
461 s->init_num=0;
462 break;
463
464 case SSL3_ST_SR_FINISHED_A:
465 case SSL3_ST_SR_FINISHED_B:
466 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
467 SSL3_ST_SR_FINISHED_B);
468 if (ret <= 0) goto end;
469 if (s->hit)
470 s->state=SSL_ST_OK;
471 else
472 s->state=SSL3_ST_SW_CHANGE_A;
473 s->init_num=0;
474 break;
475
476 case SSL3_ST_SW_CHANGE_A:
477 case SSL3_ST_SW_CHANGE_B:
478
479 s->session->cipher=s->s3->tmp.new_cipher;
480 if (!s->method->ssl3_enc->setup_key_block(s))
481 { ret= -1; goto end; }
482
483 ret=ssl3_send_change_cipher_spec(s,
484 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
485
486 if (ret <= 0) goto end;
487 s->state=SSL3_ST_SW_FINISHED_A;
488 s->init_num=0;
489
490 if (!s->method->ssl3_enc->change_cipher_state(s,
491 SSL3_CHANGE_CIPHER_SERVER_WRITE))
492 {
493 ret= -1;
494 goto end;
495 }
496
497 break;
498
499 case SSL3_ST_SW_FINISHED_A:
500 case SSL3_ST_SW_FINISHED_B:
501 ret=ssl3_send_finished(s,
502 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
503 s->method->ssl3_enc->server_finished_label,
504 s->method->ssl3_enc->server_finished_label_len);
505 if (ret <= 0) goto end;
506 s->state=SSL3_ST_SW_FLUSH;
507 if (s->hit)
508 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
509 else
510 s->s3->tmp.next_state=SSL_ST_OK;
511 s->init_num=0;
512 break;
513
514 case SSL_ST_OK:
515 /* clean a few things up */
516 ssl3_cleanup_key_block(s);
517
518 BUF_MEM_free(s->init_buf);
519 s->init_buf=NULL;
520
521 /* remove buffering on output */
522 ssl_free_wbio_buffer(s);
523
524 s->init_num=0;
525
526 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
527 {
528 /* actually not necessarily a 'new' session unless
529 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
530
531 s->new_session=0;
532
533 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
534
535 s->ctx->stats.sess_accept_good++;
536 /* s->server=1; */
537 s->handshake_func=ssl3_accept;
538
539 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
540 }
541
542 ret = 1;
543 goto end;
544 /* break; */
545
546 default:
547 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
548 ret= -1;
549 goto end;
550 /* break; */
551 }
552
553 if (!s->s3->tmp.reuse_message && !skip)
554 {
555 if (s->debug)
556 {
557 if ((ret=BIO_flush(s->wbio)) <= 0)
558 goto end;
559 }
560
561
562 if ((cb != NULL) && (s->state != state))
563 {
564 new_state=s->state;
565 s->state=state;
566 cb(s,SSL_CB_ACCEPT_LOOP,1);
567 s->state=new_state;
568 }
569 }
570 skip=0;
571 }
572 end:
573 /* BIO_flush(s->wbio); */
574
575 s->in_handshake--;
576 if (cb != NULL)
577 cb(s,SSL_CB_ACCEPT_EXIT,ret);
578 return(ret);
579 }
580
581 static int ssl3_send_hello_request(SSL *s)
582 {
583 unsigned char *p;
584
585 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
586 {
587 p=(unsigned char *)s->init_buf->data;
588 *(p++)=SSL3_MT_HELLO_REQUEST;
589 *(p++)=0;
590 *(p++)=0;
591 *(p++)=0;
592
593 s->state=SSL3_ST_SW_HELLO_REQ_B;
594 /* number of bytes to write */
595 s->init_num=4;
596 s->init_off=0;
597 }
598
599 /* SSL3_ST_SW_HELLO_REQ_B */
600 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
601 }
602
603 static int ssl3_check_client_hello(SSL *s)
604 {
605 int ok;
606 long n;
607
608 /* this function is called when we really expect a Certificate message,
609 * so permit appropriate message length */
610 n=ssl3_get_message(s,
611 SSL3_ST_SR_CERT_A,
612 SSL3_ST_SR_CERT_B,
613 -1,
614 s->max_cert_list,
615 &ok);
616 if (!ok) return((int)n);
617 s->s3->tmp.reuse_message = 1;
618 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
619 {
620 /* Throw away what we have done so far in the current handshake,
621 * which will now be aborted. (A full SSL_clear would be too much.)
622 * I hope that tmp.dh is the only thing that may need to be cleared
623 * when a handshake is not completed ... */
624 #ifndef OPENSSL_NO_DH
625 if (s->s3->tmp.dh != NULL)
626 {
627 DH_free(s->s3->tmp.dh);
628 s->s3->tmp.dh = NULL;
629 }
630 #endif
631 return 2;
632 }
633 return 1;
634 }
635
636 static int ssl3_get_client_hello(SSL *s)
637 {
638 int i,j,ok,al,ret= -1;
639 long n;
640 unsigned long id;
641 unsigned char *p,*d,*q;
642 SSL_CIPHER *c;
643 SSL_COMP *comp=NULL;
644 STACK_OF(SSL_CIPHER) *ciphers=NULL;
645
646 /* We do this so that we will respond with our native type.
647 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
648 * This down switching should be handled by a different method.
649 * If we are SSLv3, we will respond with SSLv3, even if prompted with
650 * TLSv1.
651 */
652 if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
653 {
654 s->first_packet=1;
655 s->state=SSL3_ST_SR_CLNT_HELLO_B;
656 }
657 n=ssl3_get_message(s,
658 SSL3_ST_SR_CLNT_HELLO_B,
659 SSL3_ST_SR_CLNT_HELLO_C,
660 SSL3_MT_CLIENT_HELLO,
661 SSL3_RT_MAX_PLAIN_LENGTH,
662 &ok);
663
664 if (!ok) return((int)n);
665 d=p=(unsigned char *)s->init_msg;
666
667 /* use version from inside client hello, not from record header
668 * (may differ: see RFC 2246, Appendix E, second paragraph) */
669 s->client_version=(((int)p[0])<<8)|(int)p[1];
670 p+=2;
671
672 if (s->client_version < s->version)
673 {
674 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
675 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
676 {
677 /* similar to ssl3_get_record, send alert using remote version number */
678 s->version = s->client_version;
679 }
680 al = SSL_AD_PROTOCOL_VERSION;
681 goto f_err;
682 }
683
684 /* load the client random */
685 memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
686 p+=SSL3_RANDOM_SIZE;
687
688 /* get the session-id */
689 j= *(p++);
690
691 s->hit=0;
692 /* Versions before 0.9.7 always allow session reuse during renegotiation
693 * (i.e. when s->new_session is true), option
694 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
695 * Maybe this optional behaviour should always have been the default,
696 * but we cannot safely change the default behaviour (or new applications
697 * might be written that become totally unsecure when compiled with
698 * an earlier library version)
699 */
700 if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
701 {
702 if (!ssl_get_new_session(s,1))
703 goto err;
704 }
705 else
706 {
707 i=ssl_get_prev_session(s,p,j);
708 if (i == 1)
709 { /* previous session */
710 s->hit=1;
711 }
712 else if (i == -1)
713 goto err;
714 else /* i == 0 */
715 {
716 if (!ssl_get_new_session(s,1))
717 goto err;
718 }
719 }
720
721 p+=j;
722 n2s(p,i);
723 if ((i == 0) && (j != 0))
724 {
725 /* we need a cipher if we are not resuming a session */
726 al=SSL_AD_ILLEGAL_PARAMETER;
727 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
728 goto f_err;
729 }
730 if ((p+i) >= (d+n))
731 {
732 /* not enough data */
733 al=SSL_AD_DECODE_ERROR;
734 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
735 goto f_err;
736 }
737 if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
738 == NULL))
739 {
740 goto err;
741 }
742 p+=i;
743
744 /* If it is a hit, check that the cipher is in the list */
745 if ((s->hit) && (i > 0))
746 {
747 j=0;
748 id=s->session->cipher->id;
749
750 #ifdef CIPHER_DEBUG
751 printf("client sent %d ciphers\n",sk_num(ciphers));
752 #endif
753 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
754 {
755 c=sk_SSL_CIPHER_value(ciphers,i);
756 #ifdef CIPHER_DEBUG
757 printf("client [%2d of %2d]:%s\n",
758 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
759 #endif
760 if (c->id == id)
761 {
762 j=1;
763 break;
764 }
765 }
766 if (j == 0)
767 {
768 if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
769 {
770 /* Very bad for multi-threading.... */
771 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
772 0);
773 }
774 else
775 {
776 /* we need to have the cipher in the cipher
777 * list if we are asked to reuse it */
778 al=SSL_AD_ILLEGAL_PARAMETER;
779 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
780 goto f_err;
781 }
782 }
783 }
784
785 /* compression */
786 i= *(p++);
787 if ((p+i) > (d+n))
788 {
789 /* not enough data */
790 al=SSL_AD_DECODE_ERROR;
791 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
792 goto f_err;
793 }
794 q=p;
795 for (j=0; j<i; j++)
796 {
797 if (p[j] == 0) break;
798 }
799
800 p+=i;
801 if (j >= i)
802 {
803 /* no compress */
804 al=SSL_AD_DECODE_ERROR;
805 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
806 goto f_err;
807 }
808
809 /* Worst case, we will use the NULL compression, but if we have other
810 * options, we will now look for them. We have i-1 compression
811 * algorithms from the client, starting at q. */
812 s->s3->tmp.new_compression=NULL;
813 if (s->ctx->comp_methods != NULL)
814 { /* See if we have a match */
815 int m,nn,o,v,done=0;
816
817 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
818 for (m=0; m<nn; m++)
819 {
820 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
821 v=comp->id;
822 for (o=0; o<i; o++)
823 {
824 if (v == q[o])
825 {
826 done=1;
827 break;
828 }
829 }
830 if (done) break;
831 }
832 if (done)
833 s->s3->tmp.new_compression=comp;
834 else
835 comp=NULL;
836 }
837
838 /* TLS does not mind if there is extra stuff */
839 if (s->version == SSL3_VERSION)
840 {
841 if (p < (d+n))
842 {
843 /* wrong number of bytes,
844 * there could be more to follow */
845 al=SSL_AD_DECODE_ERROR;
846 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
847 goto f_err;
848 }
849 }
850
851 /* Given s->session->ciphers and SSL_get_ciphers, we must
852 * pick a cipher */
853
854 if (!s->hit)
855 {
856 s->session->compress_meth=(comp == NULL)?0:comp->id;
857 if (s->session->ciphers != NULL)
858 sk_SSL_CIPHER_free(s->session->ciphers);
859 s->session->ciphers=ciphers;
860 if (ciphers == NULL)
861 {
862 al=SSL_AD_ILLEGAL_PARAMETER;
863 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
864 goto f_err;
865 }
866 ciphers=NULL;
867 c=ssl3_choose_cipher(s,s->session->ciphers,
868 SSL_get_ciphers(s));
869
870 if (c == NULL)
871 {
872 al=SSL_AD_HANDSHAKE_FAILURE;
873 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
874 goto f_err;
875 }
876 s->s3->tmp.new_cipher=c;
877 }
878 else
879 {
880 /* Session-id reuse */
881 #ifdef REUSE_CIPHER_BUG
882 STACK_OF(SSL_CIPHER) *sk;
883 SSL_CIPHER *nc=NULL;
884 SSL_CIPHER *ec=NULL;
885
886 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
887 {
888 sk=s->session->ciphers;
889 for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
890 {
891 c=sk_SSL_CIPHER_value(sk,i);
892 if (c->algorithms & SSL_eNULL)
893 nc=c;
894 if (SSL_C_IS_EXPORT(c))
895 ec=c;
896 }
897 if (nc != NULL)
898 s->s3->tmp.new_cipher=nc;
899 else if (ec != NULL)
900 s->s3->tmp.new_cipher=ec;
901 else
902 s->s3->tmp.new_cipher=s->session->cipher;
903 }
904 else
905 #endif
906 s->s3->tmp.new_cipher=s->session->cipher;
907 }
908
909 /* we now have the following setup.
910 * client_random
911 * cipher_list - our prefered list of ciphers
912 * ciphers - the clients prefered list of ciphers
913 * compression - basically ignored right now
914 * ssl version is set - sslv3
915 * s->session - The ssl session has been setup.
916 * s->hit - session reuse flag
917 * s->tmp.new_cipher - the new cipher to use.
918 */
919
920 ret=1;
921 if (0)
922 {
923 f_err:
924 ssl3_send_alert(s,SSL3_AL_FATAL,al);
925 }
926 err:
927 if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
928 return(ret);
929 }
930
931 static int ssl3_send_server_hello(SSL *s)
932 {
933 unsigned char *buf;
934 unsigned char *p,*d;
935 int i,sl;
936 unsigned long l,Time;
937
938 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
939 {
940 buf=(unsigned char *)s->init_buf->data;
941 p=s->s3->server_random;
942 Time=time(NULL); /* Time */
943 l2n(Time,p);
944 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
945 /* Do the message type and length last */
946 d=p= &(buf[4]);
947
948 *(p++)=s->version>>8;
949 *(p++)=s->version&0xff;
950
951 /* Random stuff */
952 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
953 p+=SSL3_RANDOM_SIZE;
954
955 /* now in theory we have 3 options to sending back the
956 * session id. If it is a re-use, we send back the
957 * old session-id, if it is a new session, we send
958 * back the new session-id or we send back a 0 length
959 * session-id if we want it to be single use.
960 * Currently I will not implement the '0' length session-id
961 * 12-Jan-98 - I'll now support the '0' length stuff.
962 */
963 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
964 s->session->session_id_length=0;
965
966 sl=s->session->session_id_length;
967 *(p++)=sl;
968 memcpy(p,s->session->session_id,sl);
969 p+=sl;
970
971 /* put the cipher */
972 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
973 p+=i;
974
975 /* put the compression method */
976 if (s->s3->tmp.new_compression == NULL)
977 *(p++)=0;
978 else
979 *(p++)=s->s3->tmp.new_compression->id;
980
981 /* do the header */
982 l=(p-d);
983 d=buf;
984 *(d++)=SSL3_MT_SERVER_HELLO;
985 l2n3(l,d);
986
987 s->state=SSL3_ST_CW_CLNT_HELLO_B;
988 /* number of bytes to write */
989 s->init_num=p-buf;
990 s->init_off=0;
991 }
992
993 /* SSL3_ST_CW_CLNT_HELLO_B */
994 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
995 }
996
997 static int ssl3_send_server_done(SSL *s)
998 {
999 unsigned char *p;
1000
1001 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1002 {
1003 p=(unsigned char *)s->init_buf->data;
1004
1005 /* do the header */
1006 *(p++)=SSL3_MT_SERVER_DONE;
1007 *(p++)=0;
1008 *(p++)=0;
1009 *(p++)=0;
1010
1011 s->state=SSL3_ST_SW_SRVR_DONE_B;
1012 /* number of bytes to write */
1013 s->init_num=4;
1014 s->init_off=0;
1015 }
1016
1017 /* SSL3_ST_CW_CLNT_HELLO_B */
1018 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1019 }
1020
1021 static int ssl3_send_server_key_exchange(SSL *s)
1022 {
1023 #ifndef OPENSSL_NO_RSA
1024 unsigned char *q;
1025 int j,num;
1026 RSA *rsa;
1027 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1028 unsigned int u;
1029 #endif
1030 #ifndef OPENSSL_NO_DH
1031 DH *dh=NULL,*dhp;
1032 #endif
1033 EVP_PKEY *pkey;
1034 unsigned char *p,*d;
1035 int al,i;
1036 unsigned long type;
1037 int n;
1038 CERT *cert;
1039 BIGNUM *r[4];
1040 int nr[4],kn;
1041 BUF_MEM *buf;
1042 EVP_MD_CTX md_ctx;
1043
1044 EVP_MD_CTX_init(&md_ctx);
1045 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1046 {
1047 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1048 cert=s->cert;
1049
1050 buf=s->init_buf;
1051
1052 r[0]=r[1]=r[2]=r[3]=NULL;
1053 n=0;
1054 #ifndef OPENSSL_NO_RSA
1055 if (type & SSL_kRSA)
1056 {
1057 rsa=cert->rsa_tmp;
1058 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1059 {
1060 rsa=s->cert->rsa_tmp_cb(s,
1061 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1062 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1063 if(rsa == NULL)
1064 {
1065 al=SSL_AD_HANDSHAKE_FAILURE;
1066 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1067 goto f_err;
1068 }
1069 RSA_up_ref(rsa);
1070 cert->rsa_tmp=rsa;
1071 }
1072 if (rsa == NULL)
1073 {
1074 al=SSL_AD_HANDSHAKE_FAILURE;
1075 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1076 goto f_err;
1077 }
1078 r[0]=rsa->n;
1079 r[1]=rsa->e;
1080 s->s3->tmp.use_rsa_tmp=1;
1081 }
1082 else
1083 #endif
1084 #ifndef OPENSSL_NO_DH
1085 if (type & SSL_kEDH)
1086 {
1087 dhp=cert->dh_tmp;
1088 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1089 dhp=s->cert->dh_tmp_cb(s,
1090 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1091 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1092 if (dhp == NULL)
1093 {
1094 al=SSL_AD_HANDSHAKE_FAILURE;
1095 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1096 goto f_err;
1097 }
1098
1099 if (s->s3->tmp.dh != NULL)
1100 {
1101 DH_free(dh);
1102 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1103 goto err;
1104 }
1105
1106 if ((dh=DHparams_dup(dhp)) == NULL)
1107 {
1108 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1109 goto err;
1110 }
1111
1112 s->s3->tmp.dh=dh;
1113 if ((dhp->pub_key == NULL ||
1114 dhp->priv_key == NULL ||
1115 (s->options & SSL_OP_SINGLE_DH_USE)))
1116 {
1117 if(!DH_generate_key(dh))
1118 {
1119 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1120 ERR_R_DH_LIB);
1121 goto err;
1122 }
1123 }
1124 else
1125 {
1126 dh->pub_key=BN_dup(dhp->pub_key);
1127 dh->priv_key=BN_dup(dhp->priv_key);
1128 if ((dh->pub_key == NULL) ||
1129 (dh->priv_key == NULL))
1130 {
1131 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1132 goto err;
1133 }
1134 }
1135 r[0]=dh->p;
1136 r[1]=dh->g;
1137 r[2]=dh->pub_key;
1138 }
1139 else
1140 #endif
1141 {
1142 al=SSL_AD_HANDSHAKE_FAILURE;
1143 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1144 goto f_err;
1145 }
1146 for (i=0; r[i] != NULL; i++)
1147 {
1148 nr[i]=BN_num_bytes(r[i]);
1149 n+=2+nr[i];
1150 }
1151
1152 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1153 {
1154 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1155 == NULL)
1156 {
1157 al=SSL_AD_DECODE_ERROR;
1158 goto f_err;
1159 }
1160 kn=EVP_PKEY_size(pkey);
1161 }
1162 else
1163 {
1164 pkey=NULL;
1165 kn=0;
1166 }
1167
1168 if (!BUF_MEM_grow(buf,n+4+kn))
1169 {
1170 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1171 goto err;
1172 }
1173 d=(unsigned char *)s->init_buf->data;
1174 p= &(d[4]);
1175
1176 for (i=0; r[i] != NULL; i++)
1177 {
1178 s2n(nr[i],p);
1179 BN_bn2bin(r[i],p);
1180 p+=nr[i];
1181 }
1182
1183 /* not anonymous */
1184 if (pkey != NULL)
1185 {
1186 /* n is the length of the params, they start at &(d[4])
1187 * and p points to the space at the end. */
1188 #ifndef OPENSSL_NO_RSA
1189 if (pkey->type == EVP_PKEY_RSA)
1190 {
1191 q=md_buf;
1192 j=0;
1193 for (num=2; num > 0; num--)
1194 {
1195 EVP_DigestInit_ex(&md_ctx,(num == 2)
1196 ?s->ctx->md5:s->ctx->sha1, NULL);
1197 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1198 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1199 EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1200 EVP_DigestFinal_ex(&md_ctx,q,
1201 (unsigned int *)&i);
1202 q+=i;
1203 j+=i;
1204 }
1205 if (RSA_sign(NID_md5_sha1, md_buf, j,
1206 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1207 {
1208 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1209 goto err;
1210 }
1211 s2n(u,p);
1212 n+=u+2;
1213 }
1214 else
1215 #endif
1216 #if !defined(OPENSSL_NO_DSA)
1217 if (pkey->type == EVP_PKEY_DSA)
1218 {
1219 /* lets do DSS */
1220 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1221 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1222 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1223 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1224 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1225 (unsigned int *)&i,pkey))
1226 {
1227 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1228 goto err;
1229 }
1230 s2n(i,p);
1231 n+=i+2;
1232 }
1233 else
1234 #endif
1235 {
1236 /* Is this error check actually needed? */
1237 al=SSL_AD_HANDSHAKE_FAILURE;
1238 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1239 goto f_err;
1240 }
1241 }
1242
1243 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1244 l2n3(n,d);
1245
1246 /* we should now have things packed up, so lets send
1247 * it off */
1248 s->init_num=n+4;
1249 s->init_off=0;
1250 }
1251
1252 s->state = SSL3_ST_SW_KEY_EXCH_B;
1253 EVP_MD_CTX_cleanup(&md_ctx);
1254 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1255 f_err:
1256 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1257 err:
1258 EVP_MD_CTX_cleanup(&md_ctx);
1259 return(-1);
1260 }
1261
1262 static int ssl3_send_certificate_request(SSL *s)
1263 {
1264 unsigned char *p,*d;
1265 int i,j,nl,off,n;
1266 STACK_OF(X509_NAME) *sk=NULL;
1267 X509_NAME *name;
1268 BUF_MEM *buf;
1269
1270 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1271 {
1272 buf=s->init_buf;
1273
1274 d=p=(unsigned char *)&(buf->data[4]);
1275
1276 /* get the list of acceptable cert types */
1277 p++;
1278 n=ssl3_get_req_cert_type(s,p);
1279 d[0]=n;
1280 p+=n;
1281 n++;
1282
1283 off=n;
1284 p+=2;
1285 n+=2;
1286
1287 sk=SSL_get_client_CA_list(s);
1288 nl=0;
1289 if (sk != NULL)
1290 {
1291 for (i=0; i<sk_X509_NAME_num(sk); i++)
1292 {
1293 name=sk_X509_NAME_value(sk,i);
1294 j=i2d_X509_NAME(name,NULL);
1295 if (!BUF_MEM_grow(buf,4+n+j+2))
1296 {
1297 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1298 goto err;
1299 }
1300 p=(unsigned char *)&(buf->data[4+n]);
1301 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1302 {
1303 s2n(j,p);
1304 i2d_X509_NAME(name,&p);
1305 n+=2+j;
1306 nl+=2+j;
1307 }
1308 else
1309 {
1310 d=p;
1311 i2d_X509_NAME(name,&p);
1312 j-=2; s2n(j,d); j+=2;
1313 n+=j;
1314 nl+=j;
1315 }
1316 }
1317 }
1318 /* else no CA names */
1319 p=(unsigned char *)&(buf->data[4+off]);
1320 s2n(nl,p);
1321
1322 d=(unsigned char *)buf->data;
1323 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1324 l2n3(n,d);
1325
1326 /* we should now have things packed up, so lets send
1327 * it off */
1328
1329 s->init_num=n+4;
1330 s->init_off=0;
1331 #ifdef NETSCAPE_HANG_BUG
1332 p=(unsigned char *)s->init_buf->data + s->init_num;
1333
1334 /* do the header */
1335 *(p++)=SSL3_MT_SERVER_DONE;
1336 *(p++)=0;
1337 *(p++)=0;
1338 *(p++)=0;
1339 s->init_num += 4;
1340 #endif
1341
1342 }
1343
1344 /* SSL3_ST_SW_CERT_REQ_B */
1345 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1346 err:
1347 return(-1);
1348 }
1349
1350 static int ssl3_get_client_key_exchange(SSL *s)
1351 {
1352 int i,al,ok;
1353 long n;
1354 unsigned long l;
1355 unsigned char *p;
1356 #ifndef OPENSSL_NO_RSA
1357 RSA *rsa=NULL;
1358 EVP_PKEY *pkey=NULL;
1359 #endif
1360 #ifndef OPENSSL_NO_DH
1361 BIGNUM *pub=NULL;
1362 DH *dh_srvr;
1363 #endif
1364 #ifndef OPENSSL_NO_KRB5
1365 KSSL_ERR kssl_err;
1366 #endif /* OPENSSL_NO_KRB5 */
1367
1368 n=ssl3_get_message(s,
1369 SSL3_ST_SR_KEY_EXCH_A,
1370 SSL3_ST_SR_KEY_EXCH_B,
1371 SSL3_MT_CLIENT_KEY_EXCHANGE,
1372 2048, /* ??? */
1373 &ok);
1374
1375 if (!ok) return((int)n);
1376 p=(unsigned char *)s->init_msg;
1377
1378 l=s->s3->tmp.new_cipher->algorithms;
1379
1380 #ifndef OPENSSL_NO_RSA
1381 if (l & SSL_kRSA)
1382 {
1383 /* FIX THIS UP EAY EAY EAY EAY */
1384 if (s->s3->tmp.use_rsa_tmp)
1385 {
1386 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1387 rsa=s->cert->rsa_tmp;
1388 /* Don't do a callback because rsa_tmp should
1389 * be sent already */
1390 if (rsa == NULL)
1391 {
1392 al=SSL_AD_HANDSHAKE_FAILURE;
1393 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1394 goto f_err;
1395
1396 }
1397 }
1398 else
1399 {
1400 pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1401 if ( (pkey == NULL) ||
1402 (pkey->type != EVP_PKEY_RSA) ||
1403 (pkey->pkey.rsa == NULL))
1404 {
1405 al=SSL_AD_HANDSHAKE_FAILURE;
1406 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1407 goto f_err;
1408 }
1409 rsa=pkey->pkey.rsa;
1410 }
1411
1412 /* TLS */
1413 if (s->version > SSL3_VERSION)
1414 {
1415 n2s(p,i);
1416 if (n != i+2)
1417 {
1418 if (!(s->options & SSL_OP_TLS_D5_BUG))
1419 {
1420 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1421 goto err;
1422 }
1423 else
1424 p-=2;
1425 }
1426 else
1427 n=i;
1428 }
1429
1430 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1431
1432 al = -1;
1433
1434 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1435 {
1436 al=SSL_AD_DECODE_ERROR;
1437 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1438 }
1439
1440 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1441 {
1442 /* The premaster secret must contain the same version number as the
1443 * ClientHello to detect version rollback attacks (strangely, the
1444 * protocol does not offer such protection for DH ciphersuites).
1445 * However, buggy clients exist that send the negotiated protocol
1446 * version instead if the server does not support the requested
1447 * protocol version.
1448 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1449 if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1450 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1451 {
1452 al=SSL_AD_DECODE_ERROR;
1453 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1454 goto f_err;
1455 }
1456 }
1457
1458 if (al != -1)
1459 {
1460 #if 0
1461 goto f_err;
1462 #else
1463 /* Some decryption failure -- use random value instead as countermeasure
1464 * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1465 * (see RFC 2246, section 7.4.7.1).
1466 * But note that due to length and protocol version checking, the
1467 * attack is impractical anyway (see section 5 in D. Bleichenbacher:
1468 * "Chosen Ciphertext Attacks Against Protocols Based on the RSA
1469 * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12).
1470 */
1471 ERR_clear_error();
1472 i = SSL_MAX_MASTER_KEY_LENGTH;
1473 p[0] = s->client_version >> 8;
1474 p[1] = s->client_version & 0xff;
1475 RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1476 #endif
1477 }
1478
1479 s->session->master_key_length=
1480 s->method->ssl3_enc->generate_master_secret(s,
1481 s->session->master_key,
1482 p,i);
1483 memset(p,0,i);
1484 }
1485 else
1486 #endif
1487 #ifndef OPENSSL_NO_DH
1488 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1489 {
1490 n2s(p,i);
1491 if (n != i+2)
1492 {
1493 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1494 {
1495 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1496 goto err;
1497 }
1498 else
1499 {
1500 p-=2;
1501 i=(int)n;
1502 }
1503 }
1504
1505 if (n == 0L) /* the parameters are in the cert */
1506 {
1507 al=SSL_AD_HANDSHAKE_FAILURE;
1508 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1509 goto f_err;
1510 }
1511 else
1512 {
1513 if (s->s3->tmp.dh == NULL)
1514 {
1515 al=SSL_AD_HANDSHAKE_FAILURE;
1516 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1517 goto f_err;
1518 }
1519 else
1520 dh_srvr=s->s3->tmp.dh;
1521 }
1522
1523 pub=BN_bin2bn(p,i,NULL);
1524 if (pub == NULL)
1525 {
1526 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1527 goto err;
1528 }
1529
1530 i=DH_compute_key(p,pub,dh_srvr);
1531
1532 if (i <= 0)
1533 {
1534 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1535 goto err;
1536 }
1537
1538 DH_free(s->s3->tmp.dh);
1539 s->s3->tmp.dh=NULL;
1540
1541 BN_clear_free(pub);
1542 pub=NULL;
1543 s->session->master_key_length=
1544 s->method->ssl3_enc->generate_master_secret(s,
1545 s->session->master_key,p,i);
1546 memset(p,0,i);
1547 }
1548 else
1549 #endif
1550 #ifndef OPENSSL_NO_KRB5
1551 if (l & SSL_kKRB5)
1552 {
1553 krb5_error_code krb5rc;
1554 krb5_data enc_ticket;
1555 krb5_data authenticator;
1556 krb5_data enc_pms;
1557 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1558 EVP_CIPHER_CTX ciph_ctx;
1559 EVP_CIPHER *enc = NULL;
1560 unsigned char iv[EVP_MAX_IV_LENGTH];
1561 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH
1562 + EVP_MAX_IV_LENGTH + 1];
1563 int padl, outl = sizeof(pms);
1564 krb5_timestamp authtime = 0;
1565 krb5_ticket_times ttimes;
1566
1567 EVP_CIPHER_CTX_init(&ciph_ctx);
1568
1569 if (!kssl_ctx) kssl_ctx = kssl_ctx_new();
1570
1571 n2s(p,i);
1572 enc_ticket.length = i;
1573 enc_ticket.data = (char *)p;
1574 p+=enc_ticket.length;
1575
1576 n2s(p,i);
1577 authenticator.length = i;
1578 authenticator.data = (char *)p;
1579 p+=authenticator.length;
1580
1581 n2s(p,i);
1582 enc_pms.length = i;
1583 enc_pms.data = (char *)p;
1584 p+=enc_pms.length;
1585
1586 if (n != enc_ticket.length + authenticator.length +
1587 enc_pms.length + 6)
1588 {
1589 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1590 SSL_R_DATA_LENGTH_TOO_LONG);
1591 goto err;
1592 }
1593
1594 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1595 &kssl_err)) != 0)
1596 {
1597 #ifdef KSSL_DEBUG
1598 printf("kssl_sget_tkt rtn %d [%d]\n",
1599 krb5rc, kssl_err.reason);
1600 if (kssl_err.text)
1601 printf("kssl_err text= %s\n", kssl_err.text);
1602 #endif /* KSSL_DEBUG */
1603 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1604 kssl_err.reason);
1605 goto err;
1606 }
1607
1608 /* Note: no authenticator is not considered an error,
1609 ** but will return authtime == 0.
1610 */
1611 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1612 &authtime, &kssl_err)) != 0)
1613 {
1614 #ifdef KSSL_DEBUG
1615 printf("kssl_check_authent rtn %d [%d]\n",
1616 krb5rc, kssl_err.reason);
1617 if (kssl_err.text)
1618 printf("kssl_err text= %s\n", kssl_err.text);
1619 #endif /* KSSL_DEBUG */
1620 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1621 kssl_err.reason);
1622 goto err;
1623 }
1624
1625 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1626 {
1627 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc);
1628 goto err;
1629 }
1630
1631 #ifdef KSSL_DEBUG
1632 kssl_ctx_show(kssl_ctx);
1633 #endif /* KSSL_DEBUG */
1634
1635 enc = kssl_map_enc(kssl_ctx->enctype);
1636 if (enc == NULL)
1637 goto err;
1638
1639 memset(iv, 0, EVP_MAX_IV_LENGTH); /* per RFC 1510 */
1640
1641 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1642 {
1643 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1644 SSL_R_DECRYPTION_FAILED);
1645 goto err;
1646 }
1647 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1648 (unsigned char *)enc_pms.data, enc_pms.length))
1649 {
1650 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1651 SSL_R_DECRYPTION_FAILED);
1652 goto err;
1653 }
1654 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1655 {
1656 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1657 SSL_R_DATA_LENGTH_TOO_LONG);
1658 goto err;
1659 }
1660 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1661 {
1662 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1663 SSL_R_DECRYPTION_FAILED);
1664 goto err;
1665 }
1666 outl += padl;
1667 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1668 {
1669 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1670 SSL_R_DATA_LENGTH_TOO_LONG);
1671 goto err;
1672 }
1673 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1674
1675 s->session->master_key_length=
1676 s->method->ssl3_enc->generate_master_secret(s,
1677 s->session->master_key, pms, outl);
1678
1679 if (kssl_ctx->client_princ)
1680 {
1681 int len = strlen(kssl_ctx->client_princ);
1682 if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
1683 {
1684 s->session->krb5_client_princ_len = len;
1685 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
1686 }
1687 }
1688
1689
1690 /* Was doing kssl_ctx_free() here,
1691 ** but it caused problems for apache.
1692 ** kssl_ctx = kssl_ctx_free(kssl_ctx);
1693 ** if (s->kssl_ctx) s->kssl_ctx = NULL;
1694 */
1695 }
1696 else
1697 #endif /* OPENSSL_NO_KRB5 */
1698 {
1699 al=SSL_AD_HANDSHAKE_FAILURE;
1700 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1701 SSL_R_UNKNOWN_CIPHER_TYPE);
1702 goto f_err;
1703 }
1704
1705 return(1);
1706 f_err:
1707 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1708 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA)
1709 err:
1710 #endif
1711 return(-1);
1712 }
1713
1714 static int ssl3_get_cert_verify(SSL *s)
1715 {
1716 EVP_PKEY *pkey=NULL;
1717 unsigned char *p;
1718 int al,ok,ret=0;
1719 long n;
1720 int type=0,i,j;
1721 X509 *peer;
1722
1723 n=ssl3_get_message(s,
1724 SSL3_ST_SR_CERT_VRFY_A,
1725 SSL3_ST_SR_CERT_VRFY_B,
1726 -1,
1727 512, /* 512? */
1728 &ok);
1729
1730 if (!ok) return((int)n);
1731
1732 if (s->session->peer != NULL)
1733 {
1734 peer=s->session->peer;
1735 pkey=X509_get_pubkey(peer);
1736 type=X509_certificate_type(peer,pkey);
1737 }
1738 else
1739 {
1740 peer=NULL;
1741 pkey=NULL;
1742 }
1743
1744 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1745 {
1746 s->s3->tmp.reuse_message=1;
1747 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1748 {
1749 al=SSL_AD_UNEXPECTED_MESSAGE;
1750 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1751 goto f_err;
1752 }
1753 ret=1;
1754 goto end;
1755 }
1756
1757 if (peer == NULL)
1758 {
1759 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1760 al=SSL_AD_UNEXPECTED_MESSAGE;
1761 goto f_err;
1762 }
1763
1764 if (!(type & EVP_PKT_SIGN))
1765 {
1766 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1767 al=SSL_AD_ILLEGAL_PARAMETER;
1768 goto f_err;
1769 }
1770
1771 if (s->s3->change_cipher_spec)
1772 {
1773 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1774 al=SSL_AD_UNEXPECTED_MESSAGE;
1775 goto f_err;
1776 }
1777
1778 /* we now have a signature that we need to verify */
1779 p=(unsigned char *)s->init_msg;
1780 n2s(p,i);
1781 n-=2;
1782 if (i > n)
1783 {
1784 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1785 al=SSL_AD_DECODE_ERROR;
1786 goto f_err;
1787 }
1788
1789 j=EVP_PKEY_size(pkey);
1790 if ((i > j) || (n > j) || (n <= 0))
1791 {
1792 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1793 al=SSL_AD_DECODE_ERROR;
1794 goto f_err;
1795 }
1796
1797 #ifndef OPENSSL_NO_RSA
1798 if (pkey->type == EVP_PKEY_RSA)
1799 {
1800 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1801 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1802 pkey->pkey.rsa);
1803 if (i < 0)
1804 {
1805 al=SSL_AD_DECRYPT_ERROR;
1806 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1807 goto f_err;
1808 }
1809 if (i == 0)
1810 {
1811 al=SSL_AD_DECRYPT_ERROR;
1812 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1813 goto f_err;
1814 }
1815 }
1816 else
1817 #endif
1818 #ifndef OPENSSL_NO_DSA
1819 if (pkey->type == EVP_PKEY_DSA)
1820 {
1821 j=DSA_verify(pkey->save_type,
1822 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1823 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1824 if (j <= 0)
1825 {
1826 /* bad signature */
1827 al=SSL_AD_DECRYPT_ERROR;
1828 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1829 goto f_err;
1830 }
1831 }
1832 else
1833 #endif
1834 {
1835 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
1836 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1837 goto f_err;
1838 }
1839
1840
1841 ret=1;
1842 if (0)
1843 {
1844 f_err:
1845 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1846 }
1847 end:
1848 EVP_PKEY_free(pkey);
1849 return(ret);
1850 }
1851
1852 static int ssl3_get_client_certificate(SSL *s)
1853 {
1854 int i,ok,al,ret= -1;
1855 X509 *x=NULL;
1856 unsigned long l,nc,llen,n;
1857 unsigned char *p,*d,*q;
1858 STACK_OF(X509) *sk=NULL;
1859
1860 n=ssl3_get_message(s,
1861 SSL3_ST_SR_CERT_A,
1862 SSL3_ST_SR_CERT_B,
1863 -1,
1864 s->max_cert_list,
1865 &ok);
1866
1867 if (!ok) return((int)n);
1868
1869 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1870 {
1871 if ( (s->verify_mode & SSL_VERIFY_PEER) &&
1872 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1873 {
1874 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1875 al=SSL_AD_HANDSHAKE_FAILURE;
1876 goto f_err;
1877 }
1878 /* If tls asked for a client cert, the client must return a 0 list */
1879 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1880 {
1881 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1882 al=SSL_AD_UNEXPECTED_MESSAGE;
1883 goto f_err;
1884 }
1885 s->s3->tmp.reuse_message=1;
1886 return(1);
1887 }
1888
1889 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1890 {
1891 al=SSL_AD_UNEXPECTED_MESSAGE;
1892 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1893 goto f_err;
1894 }
1895 d=p=(unsigned char *)s->init_msg;
1896
1897 if ((sk=sk_X509_new_null()) == NULL)
1898 {
1899 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1900 goto err;
1901 }
1902
1903 n2l3(p,llen);
1904 if (llen+3 != n)
1905 {
1906 al=SSL_AD_DECODE_ERROR;
1907 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1908 goto f_err;
1909 }
1910 for (nc=0; nc<llen; )
1911 {
1912 n2l3(p,l);
1913 if ((l+nc+3) > llen)
1914 {
1915 al=SSL_AD_DECODE_ERROR;
1916 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1917 goto f_err;
1918 }
1919
1920 q=p;
1921 x=d2i_X509(NULL,&p,l);
1922 if (x == NULL)
1923 {
1924 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1925 goto err;
1926 }
1927 if (p != (q+l))
1928 {
1929 al=SSL_AD_DECODE_ERROR;
1930 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1931 goto f_err;
1932 }
1933 if (!sk_X509_push(sk,x))
1934 {
1935 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1936 goto err;
1937 }
1938 x=NULL;
1939 nc+=l+3;
1940 }
1941
1942 if (sk_X509_num(sk) <= 0)
1943 {
1944 /* TLS does not mind 0 certs returned */
1945 if (s->version == SSL3_VERSION)
1946 {
1947 al=SSL_AD_HANDSHAKE_FAILURE;
1948 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1949 goto f_err;
1950 }
1951 /* Fail for TLS only if we required a certificate */
1952 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1953 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1954 {
1955 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1956 al=SSL_AD_HANDSHAKE_FAILURE;
1957 goto f_err;
1958 }
1959 }
1960 else
1961 {
1962 i=ssl_verify_cert_chain(s,sk);
1963 if (!i)
1964 {
1965 al=ssl_verify_alarm_type(s->verify_result);
1966 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1967 goto f_err;
1968 }
1969 }
1970
1971 if (s->session->peer != NULL) /* This should not be needed */
1972 X509_free(s->session->peer);
1973 s->session->peer=sk_X509_shift(sk);
1974 s->session->verify_result = s->verify_result;
1975
1976 /* With the current implementation, sess_cert will always be NULL
1977 * when we arrive here. */
1978 if (s->session->sess_cert == NULL)
1979 {
1980 s->session->sess_cert = ssl_sess_cert_new();
1981 if (s->session->sess_cert == NULL)
1982 {
1983 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1984 goto err;
1985 }
1986 }
1987 if (s->session->sess_cert->cert_chain != NULL)
1988 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1989 s->session->sess_cert->cert_chain=sk;
1990 /* Inconsistency alert: cert_chain does *not* include the
1991 * peer's own certificate, while we do include it in s3_clnt.c */
1992
1993 sk=NULL;
1994
1995 ret=1;
1996 if (0)
1997 {
1998 f_err:
1999 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2000 }
2001 err:
2002 if (x != NULL) X509_free(x);
2003 if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2004 return(ret);
2005 }
2006
2007 int ssl3_send_server_certificate(SSL *s)
2008 {
2009 unsigned long l;
2010 X509 *x;
2011
2012 if (s->state == SSL3_ST_SW_CERT_A)
2013 {
2014 x=ssl_get_server_send_cert(s);
2015 if (x == NULL &&
2016 /* VRS: allow null cert if auth == KRB5 */
2017 (s->s3->tmp.new_cipher->algorithms
2018 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2019 != (SSL_aKRB5|SSL_kKRB5))
2020 {
2021 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2022 return(0);
2023 }
2024
2025 l=ssl3_output_cert_chain(s,x);
2026 s->state=SSL3_ST_SW_CERT_B;
2027 s->init_num=(int)l;
2028 s->init_off=0;
2029 }
2030
2031 /* SSL3_ST_SW_CERT_B */
2032 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2033 }
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