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Modify EVP cipher behaviour in a similar way
[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) 1998-2001 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112 #define REUSE_CIPHER_BUG
113 #define NETSCAPE_HANG_BUG
114
115
116 #include <stdio.h>
117 #include <openssl/buffer.h>
118 #include <openssl/rand.h>
119 #include <openssl/objects.h>
120 #include <openssl/evp.h>
121 #include <openssl/x509.h>
122 #include <openssl/krb5_asn.h>
123 #include "ssl_locl.h"
124 #include "kssl_lcl.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)()=NULL;
168 long num1;
169 int ret= -1;
170 int new_state,state,skip=0;
171 int got_new_session=0;
172
173 RAND_add(&Time,sizeof(Time),0);
174 ERR_clear_error();
175 clear_sys_error();
176
177 if (s->info_callback != NULL)
178 cb=s->info_callback;
179 else if (s->ctx->info_callback != NULL)
180 cb=s->ctx->info_callback;
181
182 /* init things to blank */
183 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
184 s->in_handshake++;
185
186 if (s->cert == NULL)
187 {
188 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
189 return(-1);
190 }
191
192 for (;;)
193 {
194 state=s->state;
195
196 switch (s->state)
197 {
198 case SSL_ST_RENEGOTIATE:
199 s->new_session=1;
200 /* s->state=SSL_ST_ACCEPT; */
201
202 case SSL_ST_BEFORE:
203 case SSL_ST_ACCEPT:
204 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
205 case SSL_ST_OK|SSL_ST_ACCEPT:
206
207 s->server=1;
208 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
209
210 if ((s->version>>8) != 3)
211 {
212 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
213 return -1;
214 }
215 s->type=SSL_ST_ACCEPT;
216
217 if (s->init_buf == NULL)
218 {
219 if ((buf=BUF_MEM_new()) == NULL)
220 {
221 ret= -1;
222 goto end;
223 }
224 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
225 {
226 ret= -1;
227 goto end;
228 }
229 s->init_buf=buf;
230 }
231
232 if (!ssl3_setup_buffers(s))
233 {
234 ret= -1;
235 goto end;
236 }
237
238 s->init_num=0;
239
240 if (s->state != SSL_ST_RENEGOTIATE)
241 {
242 /* Ok, we now need to push on a buffering BIO so that
243 * the output is sent in a way that TCP likes :-)
244 */
245 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
246
247 ssl3_init_finished_mac(s);
248 s->state=SSL3_ST_SR_CLNT_HELLO_A;
249 s->ctx->stats.sess_accept++;
250 }
251 else
252 {
253 /* s->state == SSL_ST_RENEGOTIATE,
254 * we will just send a HelloRequest */
255 s->ctx->stats.sess_accept_renegotiate++;
256 s->state=SSL3_ST_SW_HELLO_REQ_A;
257 }
258 break;
259
260 case SSL3_ST_SW_HELLO_REQ_A:
261 case SSL3_ST_SW_HELLO_REQ_B:
262
263 s->shutdown=0;
264 ret=ssl3_send_hello_request(s);
265 if (ret <= 0) goto end;
266 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
267 s->state=SSL3_ST_SW_FLUSH;
268 s->init_num=0;
269
270 ssl3_init_finished_mac(s);
271 break;
272
273 case SSL3_ST_SW_HELLO_REQ_C:
274 s->state=SSL_ST_OK;
275 break;
276
277 case SSL3_ST_SR_CLNT_HELLO_A:
278 case SSL3_ST_SR_CLNT_HELLO_B:
279 case SSL3_ST_SR_CLNT_HELLO_C:
280
281 s->shutdown=0;
282 ret=ssl3_get_client_hello(s);
283 if (ret <= 0) goto end;
284 got_new_session=1;
285 s->state=SSL3_ST_SW_SRVR_HELLO_A;
286 s->init_num=0;
287 break;
288
289 case SSL3_ST_SW_SRVR_HELLO_A:
290 case SSL3_ST_SW_SRVR_HELLO_B:
291 ret=ssl3_send_server_hello(s);
292 if (ret <= 0) goto end;
293
294 if (s->hit)
295 s->state=SSL3_ST_SW_CHANGE_A;
296 else
297 s->state=SSL3_ST_SW_CERT_A;
298 s->init_num=0;
299 break;
300
301 case SSL3_ST_SW_CERT_A:
302 case SSL3_ST_SW_CERT_B:
303 /* Check if it is anon DH */
304 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
305 {
306 ret=ssl3_send_server_certificate(s);
307 if (ret <= 0) goto end;
308 }
309 else
310 skip=1;
311 s->state=SSL3_ST_SW_KEY_EXCH_A;
312 s->init_num=0;
313 break;
314
315 case SSL3_ST_SW_KEY_EXCH_A:
316 case SSL3_ST_SW_KEY_EXCH_B:
317 l=s->s3->tmp.new_cipher->algorithms;
318
319 /* clear this, it may get reset by
320 * send_server_key_exchange */
321 if ((s->options & SSL_OP_EPHEMERAL_RSA)
322 #ifndef OPENSSL_NO_KRB5
323 && !(l & SSL_KRB5)
324 #endif /* OPENSSL_NO_KRB5 */
325 )
326 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
327 * even when forbidden by protocol specs
328 * (handshake may fail as clients are not required to
329 * be able to handle this) */
330 s->s3->tmp.use_rsa_tmp=1;
331 else
332 s->s3->tmp.use_rsa_tmp=0;
333
334 /* only send if a DH key exchange, fortezza or
335 * RSA but we have a sign only certificate */
336 if (s->s3->tmp.use_rsa_tmp
337 || (l & (SSL_DH|SSL_kFZA))
338 || ((l & SSL_kRSA)
339 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
340 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
341 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
342 )
343 )
344 )
345 )
346 {
347 ret=ssl3_send_server_key_exchange(s);
348 if (ret <= 0) goto end;
349 }
350 else
351 skip=1;
352
353 s->state=SSL3_ST_SW_CERT_REQ_A;
354 s->init_num=0;
355 break;
356
357 case SSL3_ST_SW_CERT_REQ_A:
358 case SSL3_ST_SW_CERT_REQ_B:
359 if (/* don't request cert unless asked for it: */
360 !(s->verify_mode & SSL_VERIFY_PEER) ||
361 /* if SSL_VERIFY_CLIENT_ONCE is set,
362 * don't request cert during re-negotiation: */
363 ((s->session->peer != NULL) &&
364 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
365 /* never request cert in anonymous ciphersuites
366 * (see section "Certificate request" in SSL 3 drafts
367 * and in RFC 2246): */
368 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
369 /* ... except when the application insists on verification
370 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
371 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
372 /* never request cert in Kerberos ciphersuites */
373 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
374 {
375 /* no cert request */
376 skip=1;
377 s->s3->tmp.cert_request=0;
378 s->state=SSL3_ST_SW_SRVR_DONE_A;
379 }
380 else
381 {
382 s->s3->tmp.cert_request=1;
383 ret=ssl3_send_certificate_request(s);
384 if (ret <= 0) goto end;
385 #ifndef NETSCAPE_HANG_BUG
386 s->state=SSL3_ST_SW_SRVR_DONE_A;
387 #else
388 s->state=SSL3_ST_SW_FLUSH;
389 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
390 #endif
391 s->init_num=0;
392 }
393 break;
394
395 case SSL3_ST_SW_SRVR_DONE_A:
396 case SSL3_ST_SW_SRVR_DONE_B:
397 ret=ssl3_send_server_done(s);
398 if (ret <= 0) goto end;
399 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
400 s->state=SSL3_ST_SW_FLUSH;
401 s->init_num=0;
402 break;
403
404 case SSL3_ST_SW_FLUSH:
405 /* number of bytes to be flushed */
406 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
407 if (num1 > 0)
408 {
409 s->rwstate=SSL_WRITING;
410 num1=BIO_flush(s->wbio);
411 if (num1 <= 0) { ret= -1; goto end; }
412 s->rwstate=SSL_NOTHING;
413 }
414
415 s->state=s->s3->tmp.next_state;
416 break;
417
418 case SSL3_ST_SR_CERT_A:
419 case SSL3_ST_SR_CERT_B:
420 /* Check for second client hello (MS SGC) */
421 ret = ssl3_check_client_hello(s);
422 if (ret <= 0)
423 goto end;
424 if (ret == 2)
425 s->state = SSL3_ST_SR_CLNT_HELLO_C;
426 else {
427 /* could be sent for a DH cert, even if we
428 * have not asked for it :-) */
429 ret=ssl3_get_client_certificate(s);
430 if (ret <= 0) goto end;
431 s->init_num=0;
432 s->state=SSL3_ST_SR_KEY_EXCH_A;
433 }
434 break;
435
436 case SSL3_ST_SR_KEY_EXCH_A:
437 case SSL3_ST_SR_KEY_EXCH_B:
438 ret=ssl3_get_client_key_exchange(s);
439 if (ret <= 0) goto end;
440 s->state=SSL3_ST_SR_CERT_VRFY_A;
441 s->init_num=0;
442
443 /* We need to get hashes here so if there is
444 * a client cert, it can be verified */
445 s->method->ssl3_enc->cert_verify_mac(s,
446 &(s->s3->finish_dgst1),
447 &(s->s3->tmp.cert_verify_md[0]));
448 s->method->ssl3_enc->cert_verify_mac(s,
449 &(s->s3->finish_dgst2),
450 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
451
452 break;
453
454 case SSL3_ST_SR_CERT_VRFY_A:
455 case SSL3_ST_SR_CERT_VRFY_B:
456
457 /* we should decide if we expected this one */
458 ret=ssl3_get_cert_verify(s);
459 if (ret <= 0) goto end;
460
461 s->state=SSL3_ST_SR_FINISHED_A;
462 s->init_num=0;
463 break;
464
465 case SSL3_ST_SR_FINISHED_A:
466 case SSL3_ST_SR_FINISHED_B:
467 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
468 SSL3_ST_SR_FINISHED_B);
469 if (ret <= 0) goto end;
470 if (s->hit)
471 s->state=SSL_ST_OK;
472 else
473 s->state=SSL3_ST_SW_CHANGE_A;
474 s->init_num=0;
475 break;
476
477 case SSL3_ST_SW_CHANGE_A:
478 case SSL3_ST_SW_CHANGE_B:
479
480 s->session->cipher=s->s3->tmp.new_cipher;
481 if (!s->method->ssl3_enc->setup_key_block(s))
482 { ret= -1; goto end; }
483
484 ret=ssl3_send_change_cipher_spec(s,
485 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
486
487 if (ret <= 0) goto end;
488 s->state=SSL3_ST_SW_FINISHED_A;
489 s->init_num=0;
490
491 if (!s->method->ssl3_enc->change_cipher_state(s,
492 SSL3_CHANGE_CIPHER_SERVER_WRITE))
493 {
494 ret= -1;
495 goto end;
496 }
497
498 break;
499
500 case SSL3_ST_SW_FINISHED_A:
501 case SSL3_ST_SW_FINISHED_B:
502 ret=ssl3_send_finished(s,
503 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
504 s->method->ssl3_enc->server_finished_label,
505 s->method->ssl3_enc->server_finished_label_len);
506 if (ret <= 0) goto end;
507 s->state=SSL3_ST_SW_FLUSH;
508 if (s->hit)
509 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
510 else
511 s->s3->tmp.next_state=SSL_ST_OK;
512 s->init_num=0;
513 break;
514
515 case SSL_ST_OK:
516 /* clean a few things up */
517 ssl3_cleanup_key_block(s);
518
519 BUF_MEM_free(s->init_buf);
520 s->init_buf=NULL;
521
522 /* remove buffering on output */
523 ssl_free_wbio_buffer(s);
524
525 s->init_num=0;
526
527 if (got_new_session) /* skipped if we just sent a HelloRequest */
528 {
529 /* actually not necessarily a 'new' session unless
530 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
531
532 s->new_session=0;
533
534 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
535
536 s->ctx->stats.sess_accept_good++;
537 /* s->server=1; */
538 s->handshake_func=ssl3_accept;
539
540 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
541 }
542
543 ret = 1;
544 goto end;
545 /* break; */
546
547 default:
548 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
549 ret= -1;
550 goto end;
551 /* break; */
552 }
553
554 if (!s->s3->tmp.reuse_message && !skip)
555 {
556 if (s->debug)
557 {
558 if ((ret=BIO_flush(s->wbio)) <= 0)
559 goto end;
560 }
561
562
563 if ((cb != NULL) && (s->state != state))
564 {
565 new_state=s->state;
566 s->state=state;
567 cb(s,SSL_CB_ACCEPT_LOOP,1);
568 s->state=new_state;
569 }
570 }
571 skip=0;
572 }
573 end:
574 /* BIO_flush(s->wbio); */
575
576 if (cb != NULL)
577 cb(s,SSL_CB_ACCEPT_EXIT,ret);
578 s->in_handshake--;
579 return(ret);
580 }
581
582 static int ssl3_send_hello_request(SSL *s)
583 {
584 unsigned char *p;
585
586 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
587 {
588 p=(unsigned char *)s->init_buf->data;
589 *(p++)=SSL3_MT_HELLO_REQUEST;
590 *(p++)=0;
591 *(p++)=0;
592 *(p++)=0;
593
594 s->state=SSL3_ST_SW_HELLO_REQ_B;
595 /* number of bytes to write */
596 s->init_num=4;
597 s->init_off=0;
598 }
599
600 /* SSL3_ST_SW_HELLO_REQ_B */
601 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
602 }
603
604 static int ssl3_check_client_hello(SSL *s)
605 {
606 int ok;
607 long n;
608
609 /* this function is called when we really expect a Certificate message,
610 * so permit appropriate message length */
611 n=ssl3_get_message(s,
612 SSL3_ST_SR_CERT_A,
613 SSL3_ST_SR_CERT_B,
614 -1,
615 s->max_cert_list,
616 &ok);
617 if (!ok) return((int)n);
618 s->s3->tmp.reuse_message = 1;
619 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
620 {
621 /* Throw away what we have done so far in the current handshake,
622 * which will now be aborted. (A full SSL_clear would be too much.)
623 * I hope that tmp.dh is the only thing that may need to be cleared
624 * when a handshake is not completed ... */
625 #ifndef OPENSSL_NO_DH
626 if (s->s3->tmp.dh != NULL)
627 {
628 DH_free(s->s3->tmp.dh);
629 s->s3->tmp.dh = NULL;
630 }
631 #endif
632 return 2;
633 }
634 return 1;
635 }
636
637 static int ssl3_get_client_hello(SSL *s)
638 {
639 int i,j,ok,al,ret= -1;
640 long n;
641 unsigned long id;
642 unsigned char *p,*d,*q;
643 SSL_CIPHER *c;
644 SSL_COMP *comp=NULL;
645 STACK_OF(SSL_CIPHER) *ciphers=NULL;
646
647 /* We do this so that we will respond with our native type.
648 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
649 * This down switching should be handled by a different method.
650 * If we are SSLv3, we will respond with SSLv3, even if prompted with
651 * TLSv1.
652 */
653 if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
654 {
655 s->first_packet=1;
656 s->state=SSL3_ST_SR_CLNT_HELLO_B;
657 }
658 n=ssl3_get_message(s,
659 SSL3_ST_SR_CLNT_HELLO_B,
660 SSL3_ST_SR_CLNT_HELLO_C,
661 SSL3_MT_CLIENT_HELLO,
662 SSL3_RT_MAX_PLAIN_LENGTH,
663 &ok);
664
665 if (!ok) return((int)n);
666 d=p=(unsigned char *)s->init_msg;
667
668 /* use version from inside client hello, not from record header
669 * (may differ: see RFC 2246, Appendix E, second paragraph) */
670 s->client_version=(((int)p[0])<<8)|(int)p[1];
671 p+=2;
672
673 /* load the client random */
674 memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
675 p+=SSL3_RANDOM_SIZE;
676
677 /* get the session-id */
678 j= *(p++);
679
680 s->hit=0;
681 /* Versions before 0.9.7 always allow session reuse during renegotiation
682 * (i.e. when s->new_session is true), option
683 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
684 * Maybe this optional behaviour should always have been the default,
685 * but we cannot safely change the default behaviour (or new applications
686 * might be written that become totally unsecure when compiled with
687 * an earlier library version)
688 */
689 if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
690 {
691 if (!ssl_get_new_session(s,1))
692 goto err;
693 }
694 else
695 {
696 i=ssl_get_prev_session(s,p,j);
697 if (i == 1)
698 { /* previous session */
699 s->hit=1;
700 }
701 else if (i == -1)
702 goto err;
703 else /* i == 0 */
704 {
705 if (!ssl_get_new_session(s,1))
706 goto err;
707 }
708 }
709
710 p+=j;
711 n2s(p,i);
712 if ((i == 0) && (j != 0))
713 {
714 /* we need a cipher if we are not resuming a session */
715 al=SSL_AD_ILLEGAL_PARAMETER;
716 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
717 goto f_err;
718 }
719 if ((i+p) > (d+n))
720 {
721 /* not enough data */
722 al=SSL_AD_DECODE_ERROR;
723 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
724 goto f_err;
725 }
726 if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
727 == NULL))
728 {
729 goto err;
730 }
731 p+=i;
732
733 /* If it is a hit, check that the cipher is in the list */
734 if ((s->hit) && (i > 0))
735 {
736 j=0;
737 id=s->session->cipher->id;
738
739 #ifdef CIPHER_DEBUG
740 printf("client sent %d ciphers\n",sk_num(ciphers));
741 #endif
742 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
743 {
744 c=sk_SSL_CIPHER_value(ciphers,i);
745 #ifdef CIPHER_DEBUG
746 printf("client [%2d of %2d]:%s\n",
747 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
748 #endif
749 if (c->id == id)
750 {
751 j=1;
752 break;
753 }
754 }
755 if (j == 0)
756 {
757 if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
758 {
759 /* Very bad for multi-threading.... */
760 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
761 0);
762 }
763 else
764 {
765 /* we need to have the cipher in the cipher
766 * list if we are asked to reuse it */
767 al=SSL_AD_ILLEGAL_PARAMETER;
768 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
769 goto f_err;
770 }
771 }
772 }
773
774 /* compression */
775 i= *(p++);
776 q=p;
777 for (j=0; j<i; j++)
778 {
779 if (p[j] == 0) break;
780 }
781
782 p+=i;
783 if (j >= i)
784 {
785 /* no compress */
786 al=SSL_AD_DECODE_ERROR;
787 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
788 goto f_err;
789 }
790
791 /* Worst case, we will use the NULL compression, but if we have other
792 * options, we will now look for them. We have i-1 compression
793 * algorithms from the client, starting at q. */
794 s->s3->tmp.new_compression=NULL;
795 if (s->ctx->comp_methods != NULL)
796 { /* See if we have a match */
797 int m,nn,o,v,done=0;
798
799 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
800 for (m=0; m<nn; m++)
801 {
802 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
803 v=comp->id;
804 for (o=0; o<i; o++)
805 {
806 if (v == q[o])
807 {
808 done=1;
809 break;
810 }
811 }
812 if (done) break;
813 }
814 if (done)
815 s->s3->tmp.new_compression=comp;
816 else
817 comp=NULL;
818 }
819
820 /* TLS does not mind if there is extra stuff */
821 if (s->version == SSL3_VERSION)
822 {
823 if (p > (d+n))
824 {
825 /* wrong number of bytes,
826 * there could be more to follow */
827 al=SSL_AD_DECODE_ERROR;
828 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
829 goto f_err;
830 }
831 }
832
833 /* Given s->session->ciphers and SSL_get_ciphers, we must
834 * pick a cipher */
835
836 if (!s->hit)
837 {
838 s->session->compress_meth=(comp == NULL)?0:comp->id;
839 if (s->session->ciphers != NULL)
840 sk_SSL_CIPHER_free(s->session->ciphers);
841 s->session->ciphers=ciphers;
842 if (ciphers == NULL)
843 {
844 al=SSL_AD_ILLEGAL_PARAMETER;
845 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
846 goto f_err;
847 }
848 ciphers=NULL;
849 c=ssl3_choose_cipher(s,s->session->ciphers,
850 SSL_get_ciphers(s));
851
852 if (c == NULL)
853 {
854 al=SSL_AD_HANDSHAKE_FAILURE;
855 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
856 goto f_err;
857 }
858 s->s3->tmp.new_cipher=c;
859 }
860 else
861 {
862 /* Session-id reuse */
863 #ifdef REUSE_CIPHER_BUG
864 STACK_OF(SSL_CIPHER) *sk;
865 SSL_CIPHER *nc=NULL;
866 SSL_CIPHER *ec=NULL;
867
868 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
869 {
870 sk=s->session->ciphers;
871 for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
872 {
873 c=sk_SSL_CIPHER_value(sk,i);
874 if (c->algorithms & SSL_eNULL)
875 nc=c;
876 if (SSL_C_IS_EXPORT(c))
877 ec=c;
878 }
879 if (nc != NULL)
880 s->s3->tmp.new_cipher=nc;
881 else if (ec != NULL)
882 s->s3->tmp.new_cipher=ec;
883 else
884 s->s3->tmp.new_cipher=s->session->cipher;
885 }
886 else
887 #endif
888 s->s3->tmp.new_cipher=s->session->cipher;
889 }
890
891 /* we now have the following setup.
892 * client_random
893 * cipher_list - our prefered list of ciphers
894 * ciphers - the clients prefered list of ciphers
895 * compression - basically ignored right now
896 * ssl version is set - sslv3
897 * s->session - The ssl session has been setup.
898 * s->hit - session reuse flag
899 * s->tmp.new_cipher - the new cipher to use.
900 */
901
902 ret=1;
903 if (0)
904 {
905 f_err:
906 ssl3_send_alert(s,SSL3_AL_FATAL,al);
907 }
908 err:
909 if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
910 return(ret);
911 }
912
913 static int ssl3_send_server_hello(SSL *s)
914 {
915 unsigned char *buf;
916 unsigned char *p,*d;
917 int i,sl;
918 unsigned long l,Time;
919
920 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
921 {
922 buf=(unsigned char *)s->init_buf->data;
923 p=s->s3->server_random;
924 Time=time(NULL); /* Time */
925 l2n(Time,p);
926 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
927 /* Do the message type and length last */
928 d=p= &(buf[4]);
929
930 *(p++)=s->version>>8;
931 *(p++)=s->version&0xff;
932
933 /* Random stuff */
934 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
935 p+=SSL3_RANDOM_SIZE;
936
937 /* now in theory we have 3 options to sending back the
938 * session id. If it is a re-use, we send back the
939 * old session-id, if it is a new session, we send
940 * back the new session-id or we send back a 0 length
941 * session-id if we want it to be single use.
942 * Currently I will not implement the '0' length session-id
943 * 12-Jan-98 - I'll now support the '0' length stuff.
944 */
945 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
946 s->session->session_id_length=0;
947
948 sl=s->session->session_id_length;
949 *(p++)=sl;
950 memcpy(p,s->session->session_id,sl);
951 p+=sl;
952
953 /* put the cipher */
954 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
955 p+=i;
956
957 /* put the compression method */
958 if (s->s3->tmp.new_compression == NULL)
959 *(p++)=0;
960 else
961 *(p++)=s->s3->tmp.new_compression->id;
962
963 /* do the header */
964 l=(p-d);
965 d=buf;
966 *(d++)=SSL3_MT_SERVER_HELLO;
967 l2n3(l,d);
968
969 s->state=SSL3_ST_CW_CLNT_HELLO_B;
970 /* number of bytes to write */
971 s->init_num=p-buf;
972 s->init_off=0;
973 }
974
975 /* SSL3_ST_CW_CLNT_HELLO_B */
976 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
977 }
978
979 static int ssl3_send_server_done(SSL *s)
980 {
981 unsigned char *p;
982
983 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
984 {
985 p=(unsigned char *)s->init_buf->data;
986
987 /* do the header */
988 *(p++)=SSL3_MT_SERVER_DONE;
989 *(p++)=0;
990 *(p++)=0;
991 *(p++)=0;
992
993 s->state=SSL3_ST_SW_SRVR_DONE_B;
994 /* number of bytes to write */
995 s->init_num=4;
996 s->init_off=0;
997 }
998
999 /* SSL3_ST_CW_CLNT_HELLO_B */
1000 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1001 }
1002
1003 static int ssl3_send_server_key_exchange(SSL *s)
1004 {
1005 #ifndef OPENSSL_NO_RSA
1006 unsigned char *q;
1007 int j,num;
1008 RSA *rsa;
1009 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1010 unsigned int u;
1011 #endif
1012 #ifndef OPENSSL_NO_DH
1013 DH *dh=NULL,*dhp;
1014 #endif
1015 EVP_PKEY *pkey;
1016 unsigned char *p,*d;
1017 int al,i;
1018 unsigned long type;
1019 int n;
1020 CERT *cert;
1021 BIGNUM *r[4];
1022 int nr[4],kn;
1023 BUF_MEM *buf;
1024 EVP_MD_CTX md_ctx;
1025
1026 EVP_MD_CTX_init(&md_ctx);
1027 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1028 {
1029 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1030 cert=s->cert;
1031
1032 buf=s->init_buf;
1033
1034 r[0]=r[1]=r[2]=r[3]=NULL;
1035 n=0;
1036 #ifndef OPENSSL_NO_RSA
1037 if (type & SSL_kRSA)
1038 {
1039 rsa=cert->rsa_tmp;
1040 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1041 {
1042 rsa=s->cert->rsa_tmp_cb(s,
1043 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1044 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1045 if(rsa == NULL)
1046 {
1047 al=SSL_AD_HANDSHAKE_FAILURE;
1048 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1049 goto f_err;
1050 }
1051 RSA_up_ref(rsa);
1052 cert->rsa_tmp=rsa;
1053 }
1054 if (rsa == NULL)
1055 {
1056 al=SSL_AD_HANDSHAKE_FAILURE;
1057 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1058 goto f_err;
1059 }
1060 r[0]=rsa->n;
1061 r[1]=rsa->e;
1062 s->s3->tmp.use_rsa_tmp=1;
1063 }
1064 else
1065 #endif
1066 #ifndef OPENSSL_NO_DH
1067 if (type & SSL_kEDH)
1068 {
1069 dhp=cert->dh_tmp;
1070 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1071 dhp=s->cert->dh_tmp_cb(s,
1072 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1073 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1074 if (dhp == NULL)
1075 {
1076 al=SSL_AD_HANDSHAKE_FAILURE;
1077 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1078 goto f_err;
1079 }
1080
1081 if (s->s3->tmp.dh != NULL)
1082 {
1083 DH_free(dh);
1084 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1085 goto err;
1086 }
1087
1088 if ((dh=DHparams_dup(dhp)) == NULL)
1089 {
1090 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1091 goto err;
1092 }
1093
1094 s->s3->tmp.dh=dh;
1095 if ((dhp->pub_key == NULL ||
1096 dhp->priv_key == NULL ||
1097 (s->options & SSL_OP_SINGLE_DH_USE)))
1098 {
1099 if(!DH_generate_key(dh))
1100 {
1101 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1102 ERR_R_DH_LIB);
1103 goto err;
1104 }
1105 }
1106 else
1107 {
1108 dh->pub_key=BN_dup(dhp->pub_key);
1109 dh->priv_key=BN_dup(dhp->priv_key);
1110 if ((dh->pub_key == NULL) ||
1111 (dh->priv_key == NULL))
1112 {
1113 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1114 goto err;
1115 }
1116 }
1117 r[0]=dh->p;
1118 r[1]=dh->g;
1119 r[2]=dh->pub_key;
1120 }
1121 else
1122 #endif
1123 {
1124 al=SSL_AD_HANDSHAKE_FAILURE;
1125 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1126 goto f_err;
1127 }
1128 for (i=0; r[i] != NULL; i++)
1129 {
1130 nr[i]=BN_num_bytes(r[i]);
1131 n+=2+nr[i];
1132 }
1133
1134 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1135 {
1136 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1137 == NULL)
1138 {
1139 al=SSL_AD_DECODE_ERROR;
1140 goto f_err;
1141 }
1142 kn=EVP_PKEY_size(pkey);
1143 }
1144 else
1145 {
1146 pkey=NULL;
1147 kn=0;
1148 }
1149
1150 if (!BUF_MEM_grow(buf,n+4+kn))
1151 {
1152 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1153 goto err;
1154 }
1155 d=(unsigned char *)s->init_buf->data;
1156 p= &(d[4]);
1157
1158 for (i=0; r[i] != NULL; i++)
1159 {
1160 s2n(nr[i],p);
1161 BN_bn2bin(r[i],p);
1162 p+=nr[i];
1163 }
1164
1165 /* not anonymous */
1166 if (pkey != NULL)
1167 {
1168 /* n is the length of the params, they start at &(d[4])
1169 * and p points to the space at the end. */
1170 #ifndef OPENSSL_NO_RSA
1171 if (pkey->type == EVP_PKEY_RSA)
1172 {
1173 q=md_buf;
1174 j=0;
1175 for (num=2; num > 0; num--)
1176 {
1177 EVP_DigestInit_ex(&md_ctx,(num == 2)
1178 ?s->ctx->md5:s->ctx->sha1, NULL);
1179 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1180 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1181 EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1182 EVP_DigestFinal_ex(&md_ctx,q,
1183 (unsigned int *)&i);
1184 q+=i;
1185 j+=i;
1186 }
1187 if (RSA_sign(NID_md5_sha1, md_buf, j,
1188 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1189 {
1190 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1191 goto err;
1192 }
1193 s2n(u,p);
1194 n+=u+2;
1195 }
1196 else
1197 #endif
1198 #if !defined(OPENSSL_NO_DSA)
1199 if (pkey->type == EVP_PKEY_DSA)
1200 {
1201 /* lets do DSS */
1202 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1203 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1204 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1205 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1206 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1207 (unsigned int *)&i,pkey))
1208 {
1209 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1210 goto err;
1211 }
1212 s2n(i,p);
1213 n+=i+2;
1214 }
1215 else
1216 #endif
1217 {
1218 /* Is this error check actually needed? */
1219 al=SSL_AD_HANDSHAKE_FAILURE;
1220 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1221 goto f_err;
1222 }
1223 }
1224
1225 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1226 l2n3(n,d);
1227
1228 /* we should now have things packed up, so lets send
1229 * it off */
1230 s->init_num=n+4;
1231 s->init_off=0;
1232 }
1233
1234 s->state = SSL3_ST_SW_KEY_EXCH_B;
1235 EVP_MD_CTX_cleanup(&md_ctx);
1236 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1237 f_err:
1238 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1239 err:
1240 EVP_MD_CTX_cleanup(&md_ctx);
1241 return(-1);
1242 }
1243
1244 static int ssl3_send_certificate_request(SSL *s)
1245 {
1246 unsigned char *p,*d;
1247 int i,j,nl,off,n;
1248 STACK_OF(X509_NAME) *sk=NULL;
1249 X509_NAME *name;
1250 BUF_MEM *buf;
1251
1252 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1253 {
1254 buf=s->init_buf;
1255
1256 d=p=(unsigned char *)&(buf->data[4]);
1257
1258 /* get the list of acceptable cert types */
1259 p++;
1260 n=ssl3_get_req_cert_type(s,p);
1261 d[0]=n;
1262 p+=n;
1263 n++;
1264
1265 off=n;
1266 p+=2;
1267 n+=2;
1268
1269 sk=SSL_get_client_CA_list(s);
1270 nl=0;
1271 if (sk != NULL)
1272 {
1273 for (i=0; i<sk_X509_NAME_num(sk); i++)
1274 {
1275 name=sk_X509_NAME_value(sk,i);
1276 j=i2d_X509_NAME(name,NULL);
1277 if (!BUF_MEM_grow(buf,4+n+j+2))
1278 {
1279 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1280 goto err;
1281 }
1282 p=(unsigned char *)&(buf->data[4+n]);
1283 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1284 {
1285 s2n(j,p);
1286 i2d_X509_NAME(name,&p);
1287 n+=2+j;
1288 nl+=2+j;
1289 }
1290 else
1291 {
1292 d=p;
1293 i2d_X509_NAME(name,&p);
1294 j-=2; s2n(j,d); j+=2;
1295 n+=j;
1296 nl+=j;
1297 }
1298 }
1299 }
1300 /* else no CA names */
1301 p=(unsigned char *)&(buf->data[4+off]);
1302 s2n(nl,p);
1303
1304 d=(unsigned char *)buf->data;
1305 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1306 l2n3(n,d);
1307
1308 /* we should now have things packed up, so lets send
1309 * it off */
1310
1311 s->init_num=n+4;
1312 s->init_off=0;
1313 #ifdef NETSCAPE_HANG_BUG
1314 p=(unsigned char *)s->init_buf->data + s->init_num;
1315
1316 /* do the header */
1317 *(p++)=SSL3_MT_SERVER_DONE;
1318 *(p++)=0;
1319 *(p++)=0;
1320 *(p++)=0;
1321 s->init_num += 4;
1322 #endif
1323
1324 }
1325
1326 /* SSL3_ST_SW_CERT_REQ_B */
1327 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1328 err:
1329 return(-1);
1330 }
1331
1332 static int ssl3_get_client_key_exchange(SSL *s)
1333 {
1334 int i,al,ok;
1335 long n;
1336 unsigned long l;
1337 unsigned char *p;
1338 #ifndef OPENSSL_NO_RSA
1339 RSA *rsa=NULL;
1340 EVP_PKEY *pkey=NULL;
1341 #endif
1342 #ifndef OPENSSL_NO_DH
1343 BIGNUM *pub=NULL;
1344 DH *dh_srvr;
1345 #endif
1346 #ifndef OPENSSL_NO_KRB5
1347 KSSL_ERR kssl_err;
1348 #endif /* OPENSSL_NO_KRB5 */
1349
1350 n=ssl3_get_message(s,
1351 SSL3_ST_SR_KEY_EXCH_A,
1352 SSL3_ST_SR_KEY_EXCH_B,
1353 SSL3_MT_CLIENT_KEY_EXCHANGE,
1354 2048, /* ??? */
1355 &ok);
1356
1357 if (!ok) return((int)n);
1358 p=(unsigned char *)s->init_msg;
1359
1360 l=s->s3->tmp.new_cipher->algorithms;
1361
1362 #ifndef OPENSSL_NO_RSA
1363 if (l & SSL_kRSA)
1364 {
1365 /* FIX THIS UP EAY EAY EAY EAY */
1366 if (s->s3->tmp.use_rsa_tmp)
1367 {
1368 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1369 rsa=s->cert->rsa_tmp;
1370 /* Don't do a callback because rsa_tmp should
1371 * be sent already */
1372 if (rsa == NULL)
1373 {
1374 al=SSL_AD_HANDSHAKE_FAILURE;
1375 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1376 goto f_err;
1377
1378 }
1379 }
1380 else
1381 {
1382 pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1383 if ( (pkey == NULL) ||
1384 (pkey->type != EVP_PKEY_RSA) ||
1385 (pkey->pkey.rsa == NULL))
1386 {
1387 al=SSL_AD_HANDSHAKE_FAILURE;
1388 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1389 goto f_err;
1390 }
1391 rsa=pkey->pkey.rsa;
1392 }
1393
1394 /* TLS */
1395 if (s->version > SSL3_VERSION)
1396 {
1397 n2s(p,i);
1398 if (n != i+2)
1399 {
1400 if (!(s->options & SSL_OP_TLS_D5_BUG))
1401 {
1402 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1403 goto err;
1404 }
1405 else
1406 p-=2;
1407 }
1408 else
1409 n=i;
1410 }
1411
1412 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1413
1414 al = -1;
1415
1416 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1417 {
1418 al=SSL_AD_DECODE_ERROR;
1419 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1420 }
1421
1422 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1423 {
1424 /* The premaster secret must contain the same version number as the
1425 * ClientHello to detect version rollback attacks (strangely, the
1426 * protocol does not offer such protection for DH ciphersuites).
1427 * However, buggy clients exist that send the negotiated protocol
1428 * version instead if the server does not support the requested
1429 * protocol version.
1430 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1431 if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1432 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1433 {
1434 al=SSL_AD_DECODE_ERROR;
1435 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1436 goto f_err;
1437 }
1438 }
1439
1440 if (al != -1)
1441 {
1442 #if 0
1443 goto f_err;
1444 #else
1445 /* Some decryption failure -- use random value instead as countermeasure
1446 * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1447 * (see RFC 2246, section 7.4.7.1).
1448 * But note that due to length and protocol version checking, the
1449 * attack is impractical anyway (see section 5 in D. Bleichenbacher:
1450 * "Chosen Ciphertext Attacks Against Protocols Based on the RSA
1451 * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12).
1452 */
1453 ERR_clear_error();
1454 i = SSL_MAX_MASTER_KEY_LENGTH;
1455 p[0] = s->client_version >> 8;
1456 p[1] = s->client_version & 0xff;
1457 RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1458 #endif
1459 }
1460
1461 s->session->master_key_length=
1462 s->method->ssl3_enc->generate_master_secret(s,
1463 s->session->master_key,
1464 p,i);
1465 memset(p,0,i);
1466 }
1467 else
1468 #endif
1469 #ifndef OPENSSL_NO_DH
1470 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1471 {
1472 n2s(p,i);
1473 if (n != i+2)
1474 {
1475 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1476 {
1477 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1478 goto err;
1479 }
1480 else
1481 {
1482 p-=2;
1483 i=(int)n;
1484 }
1485 }
1486
1487 if (n == 0L) /* the parameters are in the cert */
1488 {
1489 al=SSL_AD_HANDSHAKE_FAILURE;
1490 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1491 goto f_err;
1492 }
1493 else
1494 {
1495 if (s->s3->tmp.dh == NULL)
1496 {
1497 al=SSL_AD_HANDSHAKE_FAILURE;
1498 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1499 goto f_err;
1500 }
1501 else
1502 dh_srvr=s->s3->tmp.dh;
1503 }
1504
1505 pub=BN_bin2bn(p,i,NULL);
1506 if (pub == NULL)
1507 {
1508 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1509 goto err;
1510 }
1511
1512 i=DH_compute_key(p,pub,dh_srvr);
1513
1514 if (i <= 0)
1515 {
1516 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1517 goto err;
1518 }
1519
1520 DH_free(s->s3->tmp.dh);
1521 s->s3->tmp.dh=NULL;
1522
1523 BN_clear_free(pub);
1524 pub=NULL;
1525 s->session->master_key_length=
1526 s->method->ssl3_enc->generate_master_secret(s,
1527 s->session->master_key,p,i);
1528 memset(p,0,i);
1529 }
1530 else
1531 #endif
1532 #ifndef OPENSSL_NO_KRB5
1533 if (l & SSL_kKRB5)
1534 {
1535 krb5_error_code krb5rc;
1536 krb5_data enc_ticket;
1537 krb5_data authenticator;
1538 krb5_data enc_pms;
1539 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1540 EVP_CIPHER_CTX ciph_ctx;
1541 EVP_CIPHER *enc = NULL;
1542 unsigned char iv[EVP_MAX_IV_LENGTH];
1543 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH
1544 + EVP_MAX_IV_LENGTH + 1];
1545 int padl, outl = sizeof(pms);
1546 krb5_timestamp authtime = 0;
1547 krb5_ticket_times ttimes;
1548
1549 if (!kssl_ctx) kssl_ctx = kssl_ctx_new();
1550
1551 n2s(p,i);
1552 enc_ticket.length = i;
1553 enc_ticket.data = p;
1554 p+=enc_ticket.length;
1555
1556 n2s(p,i);
1557 authenticator.length = i;
1558 authenticator.data = p;
1559 p+=authenticator.length;
1560
1561 n2s(p,i);
1562 enc_pms.length = i;
1563 enc_pms.data = p;
1564 p+=enc_pms.length;
1565
1566 if ((unsigned long)n != enc_ticket.length + authenticator.length +
1567 enc_pms.length + 6)
1568 {
1569 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1570 SSL_R_DATA_LENGTH_TOO_LONG);
1571 goto err;
1572 }
1573
1574 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1575 &kssl_err)) != 0)
1576 {
1577 #ifdef KSSL_DEBUG
1578 printf("kssl_sget_tkt rtn %d [%d]\n",
1579 krb5rc, kssl_err.reason);
1580 if (kssl_err.text)
1581 printf("kssl_err text= %s\n", kssl_err.text);
1582 #endif /* KSSL_DEBUG */
1583 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1584 kssl_err.reason);
1585 goto err;
1586 }
1587
1588 /* Note: no authenticator is not considered an error,
1589 ** but will return authtime == 0.
1590 */
1591 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1592 &authtime, &kssl_err)) != 0)
1593 {
1594 #ifdef KSSL_DEBUG
1595 printf("kssl_check_authent rtn %d [%d]\n",
1596 krb5rc, kssl_err.reason);
1597 if (kssl_err.text)
1598 printf("kssl_err text= %s\n", kssl_err.text);
1599 #endif /* KSSL_DEBUG */
1600 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1601 kssl_err.reason);
1602 goto err;
1603 }
1604
1605 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1606 {
1607 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc);
1608 goto err;
1609 }
1610
1611 #ifdef KSSL_DEBUG
1612 kssl_ctx_show(kssl_ctx);
1613 #endif /* KSSL_DEBUG */
1614
1615 enc = kssl_map_enc(kssl_ctx->enctype);
1616 if (enc == NULL)
1617 goto err;
1618
1619 memset(iv, 0, EVP_MAX_IV_LENGTH); /* per RFC 1510 */
1620
1621 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,kssl_ctx->key,iv))
1622 {
1623 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1624 SSL_R_DECRYPTION_FAILED);
1625 goto err;
1626 }
1627 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1628 enc_pms.data, enc_pms.length))
1629 {
1630 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1631 SSL_R_DECRYPTION_FAILED);
1632 goto err;
1633 }
1634 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1635 {
1636 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1637 SSL_R_DATA_LENGTH_TOO_LONG);
1638 goto err;
1639 }
1640 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1641 {
1642 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1643 SSL_R_DECRYPTION_FAILED);
1644 goto err;
1645 }
1646 outl += padl;
1647 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1648 {
1649 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1650 SSL_R_DATA_LENGTH_TOO_LONG);
1651 goto err;
1652 }
1653 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1654
1655 s->session->master_key_length=
1656 s->method->ssl3_enc->generate_master_secret(s,
1657 s->session->master_key, pms, outl);
1658
1659 if (kssl_ctx->client_princ)
1660 {
1661 int len = strlen(kssl_ctx->client_princ);
1662 if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
1663 {
1664 s->session->krb5_client_princ_len = len;
1665 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
1666 }
1667 }
1668
1669
1670 /* Was doing kssl_ctx_free() here,
1671 ** but it caused problems for apache.
1672 ** kssl_ctx = kssl_ctx_free(kssl_ctx);
1673 ** if (s->kssl_ctx) s->kssl_ctx = NULL;
1674 */
1675 }
1676 else
1677 #endif /* OPENSSL_NO_KRB5 */
1678 {
1679 al=SSL_AD_HANDSHAKE_FAILURE;
1680 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1681 SSL_R_UNKNOWN_CIPHER_TYPE);
1682 goto f_err;
1683 }
1684
1685 return(1);
1686 f_err:
1687 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1688 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA)
1689 err:
1690 #endif
1691 return(-1);
1692 }
1693
1694 static int ssl3_get_cert_verify(SSL *s)
1695 {
1696 EVP_PKEY *pkey=NULL;
1697 unsigned char *p;
1698 int al,ok,ret=0;
1699 long n;
1700 int type=0,i,j;
1701 X509 *peer;
1702
1703 n=ssl3_get_message(s,
1704 SSL3_ST_SR_CERT_VRFY_A,
1705 SSL3_ST_SR_CERT_VRFY_B,
1706 -1,
1707 512, /* 512? */
1708 &ok);
1709
1710 if (!ok) return((int)n);
1711
1712 if (s->session->peer != NULL)
1713 {
1714 peer=s->session->peer;
1715 pkey=X509_get_pubkey(peer);
1716 type=X509_certificate_type(peer,pkey);
1717 }
1718 else
1719 {
1720 peer=NULL;
1721 pkey=NULL;
1722 }
1723
1724 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1725 {
1726 s->s3->tmp.reuse_message=1;
1727 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1728 {
1729 al=SSL_AD_UNEXPECTED_MESSAGE;
1730 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1731 goto f_err;
1732 }
1733 ret=1;
1734 goto end;
1735 }
1736
1737 if (peer == NULL)
1738 {
1739 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1740 al=SSL_AD_UNEXPECTED_MESSAGE;
1741 goto f_err;
1742 }
1743
1744 if (!(type & EVP_PKT_SIGN))
1745 {
1746 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1747 al=SSL_AD_ILLEGAL_PARAMETER;
1748 goto f_err;
1749 }
1750
1751 if (s->s3->change_cipher_spec)
1752 {
1753 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1754 al=SSL_AD_UNEXPECTED_MESSAGE;
1755 goto f_err;
1756 }
1757
1758 /* we now have a signature that we need to verify */
1759 p=(unsigned char *)s->init_msg;
1760 n2s(p,i);
1761 n-=2;
1762 if (i > n)
1763 {
1764 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1765 al=SSL_AD_DECODE_ERROR;
1766 goto f_err;
1767 }
1768
1769 j=EVP_PKEY_size(pkey);
1770 if ((i > j) || (n > j) || (n <= 0))
1771 {
1772 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1773 al=SSL_AD_DECODE_ERROR;
1774 goto f_err;
1775 }
1776
1777 #ifndef OPENSSL_NO_RSA
1778 if (pkey->type == EVP_PKEY_RSA)
1779 {
1780 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1781 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1782 pkey->pkey.rsa);
1783 if (i < 0)
1784 {
1785 al=SSL_AD_DECRYPT_ERROR;
1786 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1787 goto f_err;
1788 }
1789 if (i == 0)
1790 {
1791 al=SSL_AD_DECRYPT_ERROR;
1792 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1793 goto f_err;
1794 }
1795 }
1796 else
1797 #endif
1798 #ifndef OPENSSL_NO_DSA
1799 if (pkey->type == EVP_PKEY_DSA)
1800 {
1801 j=DSA_verify(pkey->save_type,
1802 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1803 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1804 if (j <= 0)
1805 {
1806 /* bad signature */
1807 al=SSL_AD_DECRYPT_ERROR;
1808 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1809 goto f_err;
1810 }
1811 }
1812 else
1813 #endif
1814 {
1815 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
1816 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1817 goto f_err;
1818 }
1819
1820
1821 ret=1;
1822 if (0)
1823 {
1824 f_err:
1825 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1826 }
1827 end:
1828 EVP_PKEY_free(pkey);
1829 return(ret);
1830 }
1831
1832 static int ssl3_get_client_certificate(SSL *s)
1833 {
1834 int i,ok,al,ret= -1;
1835 X509 *x=NULL;
1836 unsigned long l,nc,llen,n;
1837 unsigned char *p,*d,*q;
1838 STACK_OF(X509) *sk=NULL;
1839
1840 n=ssl3_get_message(s,
1841 SSL3_ST_SR_CERT_A,
1842 SSL3_ST_SR_CERT_B,
1843 -1,
1844 s->max_cert_list,
1845 &ok);
1846
1847 if (!ok) return((int)n);
1848
1849 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1850 {
1851 if ( (s->verify_mode & SSL_VERIFY_PEER) &&
1852 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1853 {
1854 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1855 al=SSL_AD_HANDSHAKE_FAILURE;
1856 goto f_err;
1857 }
1858 /* If tls asked for a client cert, the client must return a 0 list */
1859 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1860 {
1861 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1862 al=SSL_AD_UNEXPECTED_MESSAGE;
1863 goto f_err;
1864 }
1865 s->s3->tmp.reuse_message=1;
1866 return(1);
1867 }
1868
1869 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1870 {
1871 al=SSL_AD_UNEXPECTED_MESSAGE;
1872 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1873 goto f_err;
1874 }
1875 d=p=(unsigned char *)s->init_msg;
1876
1877 if ((sk=sk_X509_new_null()) == NULL)
1878 {
1879 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1880 goto err;
1881 }
1882
1883 n2l3(p,llen);
1884 if (llen+3 != n)
1885 {
1886 al=SSL_AD_DECODE_ERROR;
1887 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1888 goto f_err;
1889 }
1890 for (nc=0; nc<llen; )
1891 {
1892 n2l3(p,l);
1893 if ((l+nc+3) > llen)
1894 {
1895 al=SSL_AD_DECODE_ERROR;
1896 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1897 goto f_err;
1898 }
1899
1900 q=p;
1901 x=d2i_X509(NULL,&p,l);
1902 if (x == NULL)
1903 {
1904 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1905 goto err;
1906 }
1907 if (p != (q+l))
1908 {
1909 al=SSL_AD_DECODE_ERROR;
1910 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1911 goto f_err;
1912 }
1913 if (!sk_X509_push(sk,x))
1914 {
1915 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1916 goto err;
1917 }
1918 x=NULL;
1919 nc+=l+3;
1920 }
1921
1922 if (sk_X509_num(sk) <= 0)
1923 {
1924 /* TLS does not mind 0 certs returned */
1925 if (s->version == SSL3_VERSION)
1926 {
1927 al=SSL_AD_HANDSHAKE_FAILURE;
1928 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1929 goto f_err;
1930 }
1931 /* Fail for TLS only if we required a certificate */
1932 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1933 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1934 {
1935 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1936 al=SSL_AD_HANDSHAKE_FAILURE;
1937 goto f_err;
1938 }
1939 }
1940 else
1941 {
1942 i=ssl_verify_cert_chain(s,sk);
1943 if (!i)
1944 {
1945 al=ssl_verify_alarm_type(s->verify_result);
1946 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1947 goto f_err;
1948 }
1949 }
1950
1951 if (s->session->peer != NULL) /* This should not be needed */
1952 X509_free(s->session->peer);
1953 s->session->peer=sk_X509_shift(sk);
1954 s->session->verify_result = s->verify_result;
1955
1956 /* With the current implementation, sess_cert will always be NULL
1957 * when we arrive here. */
1958 if (s->session->sess_cert == NULL)
1959 {
1960 s->session->sess_cert = ssl_sess_cert_new();
1961 if (s->session->sess_cert == NULL)
1962 {
1963 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1964 goto err;
1965 }
1966 }
1967 if (s->session->sess_cert->cert_chain != NULL)
1968 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1969 s->session->sess_cert->cert_chain=sk;
1970 /* Inconsistency alert: cert_chain does *not* include the
1971 * peer's own certificate, while we do include it in s3_clnt.c */
1972
1973 sk=NULL;
1974
1975 ret=1;
1976 if (0)
1977 {
1978 f_err:
1979 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1980 }
1981 err:
1982 if (x != NULL) X509_free(x);
1983 if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1984 return(ret);
1985 }
1986
1987 int ssl3_send_server_certificate(SSL *s)
1988 {
1989 unsigned long l;
1990 X509 *x;
1991
1992 if (s->state == SSL3_ST_SW_CERT_A)
1993 {
1994 x=ssl_get_server_send_cert(s);
1995 if (x == NULL &&
1996 /* VRS: allow null cert if auth == KRB5 */
1997 (s->s3->tmp.new_cipher->algorithms
1998 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1999 != (SSL_aKRB5|SSL_kKRB5))
2000 {
2001 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2002 return(0);
2003 }
2004
2005 l=ssl3_output_cert_chain(s,x);
2006 s->state=SSL3_ST_SW_CERT_B;
2007 s->init_num=(int)l;
2008 s->init_off=0;
2009 }
2010
2011 /* SSL3_ST_SW_CERT_B */
2012 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2013 }
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