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check return value of RAND_pseudo_bytes; backport from the stable branch
[thirdparty/openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_clnt.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) 1998-2003 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 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
114 * Portions of the attached software ("Contribution") are developed by
115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116 *
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
119 *
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
124
125 #include <stdio.h>
126 #include "ssl_locl.h"
127 #include "kssl_lcl.h"
128 #include <openssl/buffer.h>
129 #include <openssl/rand.h>
130 #include <openssl/objects.h>
131 #include <openssl/evp.h>
132 #include <openssl/md5.h>
133 #include <openssl/dh.h>
134 #include <openssl/bn.h>
135
136 static SSL_METHOD *ssl3_get_client_method(int ver);
137 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
138
139 #ifndef OPENSSL_NO_ECDH
140 static int curve_id2nid(int curve_id);
141 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
142 #endif
143
144 static SSL_METHOD *ssl3_get_client_method(int ver)
145 {
146 if (ver == SSL3_VERSION)
147 return(SSLv3_client_method());
148 else
149 return(NULL);
150 }
151
152 SSL_METHOD *SSLv3_client_method(void)
153 {
154 static int init=1;
155 static SSL_METHOD SSLv3_client_data;
156
157 if (init)
158 {
159 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
160
161 if (init)
162 {
163 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
164 sizeof(SSL_METHOD));
165 SSLv3_client_data.ssl_connect=ssl3_connect;
166 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
167 init=0;
168 }
169
170 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
171 }
172 return(&SSLv3_client_data);
173 }
174
175 int ssl3_connect(SSL *s)
176 {
177 BUF_MEM *buf=NULL;
178 unsigned long Time=time(NULL),l;
179 long num1;
180 void (*cb)(const SSL *ssl,int type,int val)=NULL;
181 int ret= -1;
182 int new_state,state,skip=0;;
183
184 RAND_add(&Time,sizeof(Time),0);
185 ERR_clear_error();
186 clear_sys_error();
187
188 if (s->info_callback != NULL)
189 cb=s->info_callback;
190 else if (s->ctx->info_callback != NULL)
191 cb=s->ctx->info_callback;
192
193 s->in_handshake++;
194 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
195
196 for (;;)
197 {
198 state=s->state;
199
200 switch(s->state)
201 {
202 case SSL_ST_RENEGOTIATE:
203 s->new_session=1;
204 s->state=SSL_ST_CONNECT;
205 s->ctx->stats.sess_connect_renegotiate++;
206 /* break */
207 case SSL_ST_BEFORE:
208 case SSL_ST_CONNECT:
209 case SSL_ST_BEFORE|SSL_ST_CONNECT:
210 case SSL_ST_OK|SSL_ST_CONNECT:
211
212 s->server=0;
213 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
214
215 if ((s->version & 0xff00 ) != 0x0300)
216 {
217 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
218 ret = -1;
219 goto end;
220 }
221
222 /* s->version=SSL3_VERSION; */
223 s->type=SSL_ST_CONNECT;
224
225 if (s->init_buf == NULL)
226 {
227 if ((buf=BUF_MEM_new()) == NULL)
228 {
229 ret= -1;
230 goto end;
231 }
232 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
233 {
234 ret= -1;
235 goto end;
236 }
237 s->init_buf=buf;
238 buf=NULL;
239 }
240
241 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
242
243 /* setup buffing BIO */
244 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
245
246 /* don't push the buffering BIO quite yet */
247
248 ssl3_init_finished_mac(s);
249
250 s->state=SSL3_ST_CW_CLNT_HELLO_A;
251 s->ctx->stats.sess_connect++;
252 s->init_num=0;
253 break;
254
255 case SSL3_ST_CW_CLNT_HELLO_A:
256 case SSL3_ST_CW_CLNT_HELLO_B:
257
258 s->shutdown=0;
259 ret=ssl3_client_hello(s);
260 if (ret <= 0) goto end;
261 s->state=SSL3_ST_CR_SRVR_HELLO_A;
262 s->init_num=0;
263
264 /* turn on buffering for the next lot of output */
265 if (s->bbio != s->wbio)
266 s->wbio=BIO_push(s->bbio,s->wbio);
267
268 break;
269
270 case SSL3_ST_CR_SRVR_HELLO_A:
271 case SSL3_ST_CR_SRVR_HELLO_B:
272 ret=ssl3_get_server_hello(s);
273 if (ret <= 0) goto end;
274 if (s->hit)
275 s->state=SSL3_ST_CR_FINISHED_A;
276 else
277 s->state=SSL3_ST_CR_CERT_A;
278 s->init_num=0;
279 break;
280
281 case SSL3_ST_CR_CERT_A:
282 case SSL3_ST_CR_CERT_B:
283 /* Check if it is anon DH/ECDH */
284 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
285 {
286 ret=ssl3_get_server_certificate(s);
287 if (ret <= 0) goto end;
288 }
289 else
290 skip=1;
291 s->state=SSL3_ST_CR_KEY_EXCH_A;
292 s->init_num=0;
293 break;
294
295 case SSL3_ST_CR_KEY_EXCH_A:
296 case SSL3_ST_CR_KEY_EXCH_B:
297 ret=ssl3_get_key_exchange(s);
298 if (ret <= 0) goto end;
299 s->state=SSL3_ST_CR_CERT_REQ_A;
300 s->init_num=0;
301
302 /* at this point we check that we have the
303 * required stuff from the server */
304 if (!ssl3_check_cert_and_algorithm(s))
305 {
306 ret= -1;
307 goto end;
308 }
309 break;
310
311 case SSL3_ST_CR_CERT_REQ_A:
312 case SSL3_ST_CR_CERT_REQ_B:
313 ret=ssl3_get_certificate_request(s);
314 if (ret <= 0) goto end;
315 s->state=SSL3_ST_CR_SRVR_DONE_A;
316 s->init_num=0;
317 break;
318
319 case SSL3_ST_CR_SRVR_DONE_A:
320 case SSL3_ST_CR_SRVR_DONE_B:
321 ret=ssl3_get_server_done(s);
322 if (ret <= 0) goto end;
323 if (s->s3->tmp.cert_req)
324 s->state=SSL3_ST_CW_CERT_A;
325 else
326 s->state=SSL3_ST_CW_KEY_EXCH_A;
327 s->init_num=0;
328
329 break;
330
331 case SSL3_ST_CW_CERT_A:
332 case SSL3_ST_CW_CERT_B:
333 case SSL3_ST_CW_CERT_C:
334 case SSL3_ST_CW_CERT_D:
335 ret=ssl3_send_client_certificate(s);
336 if (ret <= 0) goto end;
337 s->state=SSL3_ST_CW_KEY_EXCH_A;
338 s->init_num=0;
339 break;
340
341 case SSL3_ST_CW_KEY_EXCH_A:
342 case SSL3_ST_CW_KEY_EXCH_B:
343 ret=ssl3_send_client_key_exchange(s);
344 if (ret <= 0) goto end;
345 l=s->s3->tmp.new_cipher->algorithms;
346 /* EAY EAY EAY need to check for DH fix cert
347 * sent back */
348 /* For TLS, cert_req is set to 2, so a cert chain
349 * of nothing is sent, but no verify packet is sent */
350 /* XXX: For now, we do not support client
351 * authentication in ECDH cipher suites with
352 * ECDH (rather than ECDSA) certificates.
353 * We need to skip the certificate verify
354 * message when client's ECDH public key is sent
355 * inside the client certificate.
356 */
357 if (s->s3->tmp.cert_req == 1)
358 {
359 s->state=SSL3_ST_CW_CERT_VRFY_A;
360 }
361 else
362 {
363 s->state=SSL3_ST_CW_CHANGE_A;
364 s->s3->change_cipher_spec=0;
365 }
366
367 s->init_num=0;
368 break;
369
370 case SSL3_ST_CW_CERT_VRFY_A:
371 case SSL3_ST_CW_CERT_VRFY_B:
372 ret=ssl3_send_client_verify(s);
373 if (ret <= 0) goto end;
374 s->state=SSL3_ST_CW_CHANGE_A;
375 s->init_num=0;
376 s->s3->change_cipher_spec=0;
377 break;
378
379 case SSL3_ST_CW_CHANGE_A:
380 case SSL3_ST_CW_CHANGE_B:
381 ret=ssl3_send_change_cipher_spec(s,
382 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
383 if (ret <= 0) goto end;
384 s->state=SSL3_ST_CW_FINISHED_A;
385 s->init_num=0;
386
387 s->session->cipher=s->s3->tmp.new_cipher;
388 if (s->s3->tmp.new_compression == NULL)
389 s->session->compress_meth=0;
390 else
391 s->session->compress_meth=
392 s->s3->tmp.new_compression->id;
393 if (!s->method->ssl3_enc->setup_key_block(s))
394 {
395 ret= -1;
396 goto end;
397 }
398
399 if (!s->method->ssl3_enc->change_cipher_state(s,
400 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
401 {
402 ret= -1;
403 goto end;
404 }
405
406 break;
407
408 case SSL3_ST_CW_FINISHED_A:
409 case SSL3_ST_CW_FINISHED_B:
410 ret=ssl3_send_finished(s,
411 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
412 s->method->ssl3_enc->client_finished_label,
413 s->method->ssl3_enc->client_finished_label_len);
414 if (ret <= 0) goto end;
415 s->state=SSL3_ST_CW_FLUSH;
416
417 /* clear flags */
418 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
419 if (s->hit)
420 {
421 s->s3->tmp.next_state=SSL_ST_OK;
422 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
423 {
424 s->state=SSL_ST_OK;
425 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
426 s->s3->delay_buf_pop_ret=0;
427 }
428 }
429 else
430 {
431 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
432 }
433 s->init_num=0;
434 break;
435
436 case SSL3_ST_CR_FINISHED_A:
437 case SSL3_ST_CR_FINISHED_B:
438
439 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
440 SSL3_ST_CR_FINISHED_B);
441 if (ret <= 0) goto end;
442
443 if (s->hit)
444 s->state=SSL3_ST_CW_CHANGE_A;
445 else
446 s->state=SSL_ST_OK;
447 s->init_num=0;
448 break;
449
450 case SSL3_ST_CW_FLUSH:
451 /* number of bytes to be flushed */
452 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
453 if (num1 > 0)
454 {
455 s->rwstate=SSL_WRITING;
456 num1=BIO_flush(s->wbio);
457 if (num1 <= 0) { ret= -1; goto end; }
458 s->rwstate=SSL_NOTHING;
459 }
460
461 s->state=s->s3->tmp.next_state;
462 break;
463
464 case SSL_ST_OK:
465 /* clean a few things up */
466 ssl3_cleanup_key_block(s);
467
468 if (s->init_buf != NULL)
469 {
470 BUF_MEM_free(s->init_buf);
471 s->init_buf=NULL;
472 }
473
474 /* If we are not 'joining' the last two packets,
475 * remove the buffering now */
476 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
477 ssl_free_wbio_buffer(s);
478 /* else do it later in ssl3_write */
479
480 s->init_num=0;
481 s->new_session=0;
482
483 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
484 if (s->hit) s->ctx->stats.sess_hit++;
485
486 ret=1;
487 /* s->server=0; */
488 s->handshake_func=ssl3_connect;
489 s->ctx->stats.sess_connect_good++;
490
491 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
492
493 goto end;
494 /* break; */
495
496 default:
497 SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
498 ret= -1;
499 goto end;
500 /* break; */
501 }
502
503 /* did we do anything */
504 if (!s->s3->tmp.reuse_message && !skip)
505 {
506 if (s->debug)
507 {
508 if ((ret=BIO_flush(s->wbio)) <= 0)
509 goto end;
510 }
511
512 if ((cb != NULL) && (s->state != state))
513 {
514 new_state=s->state;
515 s->state=state;
516 cb(s,SSL_CB_CONNECT_LOOP,1);
517 s->state=new_state;
518 }
519 }
520 skip=0;
521 }
522 end:
523 s->in_handshake--;
524 if (buf != NULL)
525 BUF_MEM_free(buf);
526 if (cb != NULL)
527 cb(s,SSL_CB_CONNECT_EXIT,ret);
528 return(ret);
529 }
530
531
532 int ssl3_client_hello(SSL *s)
533 {
534 unsigned char *buf;
535 unsigned char *p,*d;
536 int i,j;
537 unsigned long Time,l;
538 SSL_COMP *comp;
539
540 buf=(unsigned char *)s->init_buf->data;
541 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
542 {
543 if ((s->session == NULL) ||
544 (s->session->ssl_version != s->version) ||
545 (s->session->not_resumable))
546 {
547 if (!ssl_get_new_session(s,0))
548 goto err;
549 }
550 /* else use the pre-loaded session */
551
552 p=s->s3->client_random;
553 Time=time(NULL); /* Time */
554 l2n(Time,p);
555 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
556 goto err;
557
558 /* Do the message type and length last */
559 d=p= &(buf[4]);
560
561 *(p++)=s->version>>8;
562 *(p++)=s->version&0xff;
563 s->client_version=s->version;
564
565 /* Random stuff */
566 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
567 p+=SSL3_RANDOM_SIZE;
568
569 /* Session ID */
570 if (s->new_session)
571 i=0;
572 else
573 i=s->session->session_id_length;
574 *(p++)=i;
575 if (i != 0)
576 {
577 if (i > (int)sizeof(s->session->session_id))
578 {
579 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
580 goto err;
581 }
582 memcpy(p,s->session->session_id,i);
583 p+=i;
584 }
585
586 /* Ciphers supported */
587 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
588 if (i == 0)
589 {
590 SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
591 goto err;
592 }
593 s2n(i,p);
594 p+=i;
595
596 /* COMPRESSION */
597 if (s->ctx->comp_methods == NULL)
598 j=0;
599 else
600 j=sk_SSL_COMP_num(s->ctx->comp_methods);
601 *(p++)=1+j;
602 for (i=0; i<j; i++)
603 {
604 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
605 *(p++)=comp->id;
606 }
607 *(p++)=0; /* Add the NULL method */
608
609 l=(p-d);
610 d=buf;
611 *(d++)=SSL3_MT_CLIENT_HELLO;
612 l2n3(l,d);
613
614 s->state=SSL3_ST_CW_CLNT_HELLO_B;
615 /* number of bytes to write */
616 s->init_num=p-buf;
617 s->init_off=0;
618 }
619
620 /* SSL3_ST_CW_CLNT_HELLO_B */
621 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
622 err:
623 return(-1);
624 }
625
626 int ssl3_get_server_hello(SSL *s)
627 {
628 STACK_OF(SSL_CIPHER) *sk;
629 SSL_CIPHER *c;
630 unsigned char *p,*d;
631 int i,al,ok;
632 unsigned int j;
633 long n;
634 SSL_COMP *comp;
635
636 n=s->method->ssl_get_message(s,
637 SSL3_ST_CR_SRVR_HELLO_A,
638 SSL3_ST_CR_SRVR_HELLO_B,
639 -1,
640 300, /* ?? */
641 &ok);
642
643 if (!ok) return((int)n);
644
645 if ( SSL_version(s) == DTLS1_VERSION)
646 {
647 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
648 {
649 if ( s->d1->send_cookie == 0)
650 {
651 s->s3->tmp.reuse_message = 1;
652 return 1;
653 }
654 else /* already sent a cookie */
655 {
656 al=SSL_AD_UNEXPECTED_MESSAGE;
657 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
658 goto f_err;
659 }
660 }
661 }
662
663 if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
664 {
665 al=SSL_AD_UNEXPECTED_MESSAGE;
666 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
667 goto f_err;
668 }
669
670 d=p=(unsigned char *)s->init_msg;
671
672 if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
673 {
674 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
675 s->version=(s->version&0xff00)|p[1];
676 al=SSL_AD_PROTOCOL_VERSION;
677 goto f_err;
678 }
679 p+=2;
680
681 /* load the server hello data */
682 /* load the server random */
683 memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
684 p+=SSL3_RANDOM_SIZE;
685
686 /* get the session-id */
687 j= *(p++);
688
689 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
690 {
691 al=SSL_AD_ILLEGAL_PARAMETER;
692 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
693 goto f_err;
694 }
695
696 if (j != 0 && j == s->session->session_id_length
697 && memcmp(p,s->session->session_id,j) == 0)
698 {
699 if(s->sid_ctx_length != s->session->sid_ctx_length
700 || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
701 {
702 /* actually a client application bug */
703 al=SSL_AD_ILLEGAL_PARAMETER;
704 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
705 goto f_err;
706 }
707 s->hit=1;
708 }
709 else /* a miss or crap from the other end */
710 {
711 /* If we were trying for session-id reuse, make a new
712 * SSL_SESSION so we don't stuff up other people */
713 s->hit=0;
714 if (s->session->session_id_length > 0)
715 {
716 if (!ssl_get_new_session(s,0))
717 {
718 al=SSL_AD_INTERNAL_ERROR;
719 goto f_err;
720 }
721 }
722 s->session->session_id_length=j;
723 memcpy(s->session->session_id,p,j); /* j could be 0 */
724 }
725 p+=j;
726 c=ssl_get_cipher_by_char(s,p);
727 if (c == NULL)
728 {
729 /* unknown cipher */
730 al=SSL_AD_ILLEGAL_PARAMETER;
731 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
732 goto f_err;
733 }
734 p+=ssl_put_cipher_by_char(s,NULL,NULL);
735
736 sk=ssl_get_ciphers_by_id(s);
737 i=sk_SSL_CIPHER_find(sk,c);
738 if (i < 0)
739 {
740 /* we did not say we would use this cipher */
741 al=SSL_AD_ILLEGAL_PARAMETER;
742 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
743 goto f_err;
744 }
745
746 /* Depending on the session caching (internal/external), the cipher
747 and/or cipher_id values may not be set. Make sure that
748 cipher_id is set and use it for comparison. */
749 if (s->session->cipher)
750 s->session->cipher_id = s->session->cipher->id;
751 if (s->hit && (s->session->cipher_id != c->id))
752 {
753 if (!(s->options &
754 SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
755 {
756 al=SSL_AD_ILLEGAL_PARAMETER;
757 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
758 goto f_err;
759 }
760 }
761 s->s3->tmp.new_cipher=c;
762
763 /* lets get the compression algorithm */
764 /* COMPRESSION */
765 j= *(p++);
766 if (j == 0)
767 comp=NULL;
768 else
769 comp=ssl3_comp_find(s->ctx->comp_methods,j);
770
771 if ((j != 0) && (comp == NULL))
772 {
773 al=SSL_AD_ILLEGAL_PARAMETER;
774 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
775 goto f_err;
776 }
777 else
778 {
779 s->s3->tmp.new_compression=comp;
780 }
781
782 if (p != (d+n))
783 {
784 /* wrong packet length */
785 al=SSL_AD_DECODE_ERROR;
786 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
787 goto err;
788 }
789
790 return(1);
791 f_err:
792 ssl3_send_alert(s,SSL3_AL_FATAL,al);
793 err:
794 return(-1);
795 }
796
797 int ssl3_get_server_certificate(SSL *s)
798 {
799 int al,i,ok,ret= -1;
800 unsigned long n,nc,llen,l;
801 X509 *x=NULL;
802 const unsigned char *q,*p;
803 unsigned char *d;
804 STACK_OF(X509) *sk=NULL;
805 SESS_CERT *sc;
806 EVP_PKEY *pkey=NULL;
807 int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
808
809 n=s->method->ssl_get_message(s,
810 SSL3_ST_CR_CERT_A,
811 SSL3_ST_CR_CERT_B,
812 -1,
813 s->max_cert_list,
814 &ok);
815
816 if (!ok) return((int)n);
817
818 if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
819 {
820 s->s3->tmp.reuse_message=1;
821 return(1);
822 }
823
824 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
825 {
826 al=SSL_AD_UNEXPECTED_MESSAGE;
827 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
828 goto f_err;
829 }
830 p=d=(unsigned char *)s->init_msg;
831
832 if ((sk=sk_X509_new_null()) == NULL)
833 {
834 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
835 goto err;
836 }
837
838 n2l3(p,llen);
839 if (llen+3 != n)
840 {
841 al=SSL_AD_DECODE_ERROR;
842 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
843 goto f_err;
844 }
845 for (nc=0; nc<llen; )
846 {
847 n2l3(p,l);
848 if ((l+nc+3) > llen)
849 {
850 al=SSL_AD_DECODE_ERROR;
851 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
852 goto f_err;
853 }
854
855 q=p;
856 x=d2i_X509(NULL,&q,l);
857 if (x == NULL)
858 {
859 al=SSL_AD_BAD_CERTIFICATE;
860 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
861 goto f_err;
862 }
863 if (q != (p+l))
864 {
865 al=SSL_AD_DECODE_ERROR;
866 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
867 goto f_err;
868 }
869 if (!sk_X509_push(sk,x))
870 {
871 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
872 goto err;
873 }
874 x=NULL;
875 nc+=l+3;
876 p=q;
877 }
878
879 i=ssl_verify_cert_chain(s,sk);
880 if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
881 #ifndef OPENSSL_NO_KRB5
882 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
883 != (SSL_aKRB5|SSL_kKRB5)
884 #endif /* OPENSSL_NO_KRB5 */
885 )
886 {
887 al=ssl_verify_alarm_type(s->verify_result);
888 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
889 goto f_err;
890 }
891 ERR_clear_error(); /* but we keep s->verify_result */
892
893 sc=ssl_sess_cert_new();
894 if (sc == NULL) goto err;
895
896 if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
897 s->session->sess_cert=sc;
898
899 sc->cert_chain=sk;
900 /* Inconsistency alert: cert_chain does include the peer's
901 * certificate, which we don't include in s3_srvr.c */
902 x=sk_X509_value(sk,0);
903 sk=NULL;
904 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
905
906 pkey=X509_get_pubkey(x);
907
908 /* VRS: allow null cert if auth == KRB5 */
909 need_cert = ((s->s3->tmp.new_cipher->algorithms
910 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
911 == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
912
913 #ifdef KSSL_DEBUG
914 printf("pkey,x = %p, %p\n", pkey,x);
915 printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
916 printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
917 s->s3->tmp.new_cipher->algorithms, need_cert);
918 #endif /* KSSL_DEBUG */
919
920 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
921 {
922 x=NULL;
923 al=SSL3_AL_FATAL;
924 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
925 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
926 goto f_err;
927 }
928
929 i=ssl_cert_type(x,pkey);
930 if (need_cert && i < 0)
931 {
932 x=NULL;
933 al=SSL3_AL_FATAL;
934 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
935 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
936 goto f_err;
937 }
938
939 if (need_cert)
940 {
941 sc->peer_cert_type=i;
942 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
943 /* Why would the following ever happen?
944 * We just created sc a couple of lines ago. */
945 if (sc->peer_pkeys[i].x509 != NULL)
946 X509_free(sc->peer_pkeys[i].x509);
947 sc->peer_pkeys[i].x509=x;
948 sc->peer_key= &(sc->peer_pkeys[i]);
949
950 if (s->session->peer != NULL)
951 X509_free(s->session->peer);
952 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
953 s->session->peer=x;
954 }
955 else
956 {
957 sc->peer_cert_type=i;
958 sc->peer_key= NULL;
959
960 if (s->session->peer != NULL)
961 X509_free(s->session->peer);
962 s->session->peer=NULL;
963 }
964 s->session->verify_result = s->verify_result;
965
966 x=NULL;
967 ret=1;
968
969 if (0)
970 {
971 f_err:
972 ssl3_send_alert(s,SSL3_AL_FATAL,al);
973 }
974 err:
975 EVP_PKEY_free(pkey);
976 X509_free(x);
977 sk_X509_pop_free(sk,X509_free);
978 return(ret);
979 }
980
981 int ssl3_get_key_exchange(SSL *s)
982 {
983 #ifndef OPENSSL_NO_RSA
984 unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
985 #endif
986 EVP_MD_CTX md_ctx;
987 unsigned char *param,*p;
988 int al,i,j,param_len,ok;
989 long n,alg;
990 EVP_PKEY *pkey=NULL;
991 #ifndef OPENSSL_NO_RSA
992 RSA *rsa=NULL;
993 #endif
994 #ifndef OPENSSL_NO_DH
995 DH *dh=NULL;
996 #endif
997 #ifndef OPENSSL_NO_ECDH
998 EC_KEY *ecdh = NULL;
999 BN_CTX *bn_ctx = NULL;
1000 EC_POINT *srvr_ecpoint = NULL;
1001 int curve_nid = 0;
1002 int encoded_pt_len = 0;
1003 #endif
1004
1005 /* use same message size as in ssl3_get_certificate_request()
1006 * as ServerKeyExchange message may be skipped */
1007 n=s->method->ssl_get_message(s,
1008 SSL3_ST_CR_KEY_EXCH_A,
1009 SSL3_ST_CR_KEY_EXCH_B,
1010 -1,
1011 s->max_cert_list,
1012 &ok);
1013
1014 if (!ok) return((int)n);
1015
1016 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1017 {
1018 s->s3->tmp.reuse_message=1;
1019 return(1);
1020 }
1021
1022 param=p=(unsigned char *)s->init_msg;
1023
1024 if (s->session->sess_cert != NULL)
1025 {
1026 #ifndef OPENSSL_NO_RSA
1027 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1028 {
1029 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1030 s->session->sess_cert->peer_rsa_tmp=NULL;
1031 }
1032 #endif
1033 #ifndef OPENSSL_NO_DH
1034 if (s->session->sess_cert->peer_dh_tmp)
1035 {
1036 DH_free(s->session->sess_cert->peer_dh_tmp);
1037 s->session->sess_cert->peer_dh_tmp=NULL;
1038 }
1039 #endif
1040 #ifndef OPENSSL_NO_ECDH
1041 if (s->session->sess_cert->peer_ecdh_tmp)
1042 {
1043 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1044 s->session->sess_cert->peer_ecdh_tmp=NULL;
1045 }
1046 #endif
1047 }
1048 else
1049 {
1050 s->session->sess_cert=ssl_sess_cert_new();
1051 }
1052
1053 param_len=0;
1054 alg=s->s3->tmp.new_cipher->algorithms;
1055 EVP_MD_CTX_init(&md_ctx);
1056
1057 #ifndef OPENSSL_NO_RSA
1058 if (alg & SSL_kRSA)
1059 {
1060 if ((rsa=RSA_new()) == NULL)
1061 {
1062 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1063 goto err;
1064 }
1065 n2s(p,i);
1066 param_len=i+2;
1067 if (param_len > n)
1068 {
1069 al=SSL_AD_DECODE_ERROR;
1070 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1071 goto f_err;
1072 }
1073 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1074 {
1075 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1076 goto err;
1077 }
1078 p+=i;
1079
1080 n2s(p,i);
1081 param_len+=i+2;
1082 if (param_len > n)
1083 {
1084 al=SSL_AD_DECODE_ERROR;
1085 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1086 goto f_err;
1087 }
1088 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1089 {
1090 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1091 goto err;
1092 }
1093 p+=i;
1094 n-=param_len;
1095
1096 /* this should be because we are using an export cipher */
1097 if (alg & SSL_aRSA)
1098 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1099 else
1100 {
1101 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1102 goto err;
1103 }
1104 s->session->sess_cert->peer_rsa_tmp=rsa;
1105 rsa=NULL;
1106 }
1107 #else /* OPENSSL_NO_RSA */
1108 if (0)
1109 ;
1110 #endif
1111 #ifndef OPENSSL_NO_DH
1112 else if (alg & SSL_kEDH)
1113 {
1114 if ((dh=DH_new()) == NULL)
1115 {
1116 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1117 goto err;
1118 }
1119 n2s(p,i);
1120 param_len=i+2;
1121 if (param_len > n)
1122 {
1123 al=SSL_AD_DECODE_ERROR;
1124 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1125 goto f_err;
1126 }
1127 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1128 {
1129 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1130 goto err;
1131 }
1132 p+=i;
1133
1134 n2s(p,i);
1135 param_len+=i+2;
1136 if (param_len > n)
1137 {
1138 al=SSL_AD_DECODE_ERROR;
1139 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1140 goto f_err;
1141 }
1142 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1143 {
1144 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1145 goto err;
1146 }
1147 p+=i;
1148
1149 n2s(p,i);
1150 param_len+=i+2;
1151 if (param_len > n)
1152 {
1153 al=SSL_AD_DECODE_ERROR;
1154 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1155 goto f_err;
1156 }
1157 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1158 {
1159 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1160 goto err;
1161 }
1162 p+=i;
1163 n-=param_len;
1164
1165 #ifndef OPENSSL_NO_RSA
1166 if (alg & SSL_aRSA)
1167 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1168 #else
1169 if (0)
1170 ;
1171 #endif
1172 #ifndef OPENSSL_NO_DSA
1173 else if (alg & SSL_aDSS)
1174 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1175 #endif
1176 /* else anonymous DH, so no certificate or pkey. */
1177
1178 s->session->sess_cert->peer_dh_tmp=dh;
1179 dh=NULL;
1180 }
1181 else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1182 {
1183 al=SSL_AD_ILLEGAL_PARAMETER;
1184 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1185 goto f_err;
1186 }
1187 #endif /* !OPENSSL_NO_DH */
1188
1189 #ifndef OPENSSL_NO_ECDH
1190 else if (alg & SSL_kECDHE)
1191 {
1192 if ((ecdh=EC_KEY_new()) == NULL)
1193 {
1194 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1195 goto err;
1196 }
1197
1198 /* Extract elliptic curve parameters and the
1199 * server's ephemeral ECDH public key.
1200 * Keep accumulating lengths of various components in
1201 * param_len and make sure it never exceeds n.
1202 */
1203
1204 /* XXX: For now we only support named (not generic) curves
1205 * and the ECParameters in this case is just two bytes.
1206 */
1207 param_len=2;
1208 if ((param_len > n) ||
1209 (*p != NAMED_CURVE_TYPE) ||
1210 ((curve_nid = curve_id2nid(*(p + 1))) == 0))
1211 {
1212 al=SSL_AD_INTERNAL_ERROR;
1213 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1214 goto f_err;
1215 }
1216
1217 if (!(ecdh->group=EC_GROUP_new_by_nid(curve_nid)))
1218 {
1219 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1220 goto err;
1221 }
1222
1223 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1224 (EC_GROUP_get_degree(ecdh->group) > 163))
1225 {
1226 al=SSL_AD_EXPORT_RESTRICTION;
1227 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1228 goto f_err;
1229 }
1230
1231 p+=2;
1232
1233 /* Next, get the encoded ECPoint */
1234 if (((srvr_ecpoint = EC_POINT_new(ecdh->group)) == NULL) ||
1235 ((bn_ctx = BN_CTX_new()) == NULL))
1236 {
1237 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1238 goto err;
1239 }
1240
1241 encoded_pt_len = *p; /* length of encoded point */
1242 p+=1;
1243 param_len += (1 + encoded_pt_len);
1244 if ((param_len > n) ||
1245 (EC_POINT_oct2point(ecdh->group, srvr_ecpoint,
1246 p, encoded_pt_len, bn_ctx) == 0))
1247 {
1248 al=SSL_AD_DECODE_ERROR;
1249 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1250 goto f_err;
1251 }
1252
1253 n-=param_len;
1254 p+=encoded_pt_len;
1255
1256 /* The ECC/TLS specification does not mention
1257 * the use of DSA to sign ECParameters in the server
1258 * key exchange message. We do support RSA and ECDSA.
1259 */
1260 if (0) ;
1261 #ifndef OPENSSL_NO_RSA
1262 else if (alg & SSL_aRSA)
1263 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1264 #endif
1265 #ifndef OPENSSL_NO_ECDSA
1266 else if (alg & SSL_aECDSA)
1267 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1268 #endif
1269 /* else anonymous ECDH, so no certificate or pkey. */
1270 ecdh->pub_key = srvr_ecpoint;
1271 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1272 ecdh=NULL;
1273 BN_CTX_free(bn_ctx);
1274 srvr_ecpoint = NULL;
1275 }
1276 else if (alg & SSL_kECDH)
1277 {
1278 al=SSL_AD_UNEXPECTED_MESSAGE;
1279 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1280 goto f_err;
1281 }
1282 #endif /* !OPENSSL_NO_ECDH */
1283 if (alg & SSL_aFZA)
1284 {
1285 al=SSL_AD_HANDSHAKE_FAILURE;
1286 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1287 goto f_err;
1288 }
1289
1290
1291 /* p points to the next byte, there are 'n' bytes left */
1292
1293 /* if it was signed, check the signature */
1294 if (pkey != NULL)
1295 {
1296 n2s(p,i);
1297 n-=2;
1298 j=EVP_PKEY_size(pkey);
1299
1300 if ((i != n) || (n > j) || (n <= 0))
1301 {
1302 /* wrong packet length */
1303 al=SSL_AD_DECODE_ERROR;
1304 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1305 goto f_err;
1306 }
1307
1308 #ifndef OPENSSL_NO_RSA
1309 if (pkey->type == EVP_PKEY_RSA)
1310 {
1311 int num;
1312
1313 j=0;
1314 q=md_buf;
1315 for (num=2; num > 0; num--)
1316 {
1317 EVP_DigestInit_ex(&md_ctx,(num == 2)
1318 ?s->ctx->md5:s->ctx->sha1, NULL);
1319 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1320 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1321 EVP_DigestUpdate(&md_ctx,param,param_len);
1322 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1323 q+=i;
1324 j+=i;
1325 }
1326 i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1327 pkey->pkey.rsa);
1328 if (i < 0)
1329 {
1330 al=SSL_AD_DECRYPT_ERROR;
1331 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1332 goto f_err;
1333 }
1334 if (i == 0)
1335 {
1336 /* bad signature */
1337 al=SSL_AD_DECRYPT_ERROR;
1338 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1339 goto f_err;
1340 }
1341 }
1342 else
1343 #endif
1344 #ifndef OPENSSL_NO_DSA
1345 if (pkey->type == EVP_PKEY_DSA)
1346 {
1347 /* lets do DSS */
1348 EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1349 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1350 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1351 EVP_VerifyUpdate(&md_ctx,param,param_len);
1352 if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1353 {
1354 /* bad signature */
1355 al=SSL_AD_DECRYPT_ERROR;
1356 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1357 goto f_err;
1358 }
1359 }
1360 else
1361 #endif
1362 #ifndef OPENSSL_NO_ECDSA
1363 if (pkey->type == EVP_PKEY_EC)
1364 {
1365 /* let's do ECDSA */
1366 EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1367 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1368 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1369 EVP_VerifyUpdate(&md_ctx,param,param_len);
1370 if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1371 {
1372 /* bad signature */
1373 al=SSL_AD_DECRYPT_ERROR;
1374 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1375 goto f_err;
1376 }
1377 }
1378 else
1379 #endif
1380 {
1381 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1382 goto err;
1383 }
1384 }
1385 else
1386 {
1387 /* still data left over */
1388 if (!(alg & SSL_aNULL))
1389 {
1390 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1391 goto err;
1392 }
1393 if (n != 0)
1394 {
1395 al=SSL_AD_DECODE_ERROR;
1396 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1397 goto f_err;
1398 }
1399 }
1400 EVP_PKEY_free(pkey);
1401 EVP_MD_CTX_cleanup(&md_ctx);
1402 return(1);
1403 f_err:
1404 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1405 err:
1406 EVP_PKEY_free(pkey);
1407 #ifndef OPENSSL_NO_RSA
1408 if (rsa != NULL)
1409 RSA_free(rsa);
1410 #endif
1411 #ifndef OPENSSL_NO_DH
1412 if (dh != NULL)
1413 DH_free(dh);
1414 #endif
1415 #ifndef OPENSSL_NO_ECDH
1416 BN_CTX_free(bn_ctx);
1417 EC_POINT_free(srvr_ecpoint);
1418 if (ecdh != NULL)
1419 EC_KEY_free(ecdh);
1420 #endif
1421 EVP_MD_CTX_cleanup(&md_ctx);
1422 return(-1);
1423 }
1424
1425 int ssl3_get_certificate_request(SSL *s)
1426 {
1427 int ok,ret=0;
1428 unsigned long n,nc,l;
1429 unsigned int llen,ctype_num,i;
1430 X509_NAME *xn=NULL;
1431 const unsigned char *p,*q;
1432 unsigned char *d;
1433 STACK_OF(X509_NAME) *ca_sk=NULL;
1434
1435 n=s->method->ssl_get_message(s,
1436 SSL3_ST_CR_CERT_REQ_A,
1437 SSL3_ST_CR_CERT_REQ_B,
1438 -1,
1439 s->max_cert_list,
1440 &ok);
1441
1442 if (!ok) return((int)n);
1443
1444 s->s3->tmp.cert_req=0;
1445
1446 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1447 {
1448 s->s3->tmp.reuse_message=1;
1449 return(1);
1450 }
1451
1452 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1453 {
1454 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1455 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1456 goto err;
1457 }
1458
1459 /* TLS does not like anon-DH with client cert */
1460 if (s->version > SSL3_VERSION)
1461 {
1462 l=s->s3->tmp.new_cipher->algorithms;
1463 if (l & SSL_aNULL)
1464 {
1465 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1466 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1467 goto err;
1468 }
1469 }
1470
1471 p=d=(unsigned char *)s->init_msg;
1472
1473 if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1474 {
1475 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1476 goto err;
1477 }
1478
1479 /* get the certificate types */
1480 ctype_num= *(p++);
1481 if (ctype_num > SSL3_CT_NUMBER)
1482 ctype_num=SSL3_CT_NUMBER;
1483 for (i=0; i<ctype_num; i++)
1484 s->s3->tmp.ctype[i]= p[i];
1485 p+=ctype_num;
1486
1487 /* get the CA RDNs */
1488 n2s(p,llen);
1489 #if 0
1490 {
1491 FILE *out;
1492 out=fopen("/tmp/vsign.der","w");
1493 fwrite(p,1,llen,out);
1494 fclose(out);
1495 }
1496 #endif
1497
1498 if ((llen+ctype_num+2+1) != n)
1499 {
1500 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1501 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1502 goto err;
1503 }
1504
1505 for (nc=0; nc<llen; )
1506 {
1507 n2s(p,l);
1508 if ((l+nc+2) > llen)
1509 {
1510 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1511 goto cont; /* netscape bugs */
1512 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1513 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1514 goto err;
1515 }
1516
1517 q=p;
1518
1519 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1520 {
1521 /* If netscape tolerance is on, ignore errors */
1522 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1523 goto cont;
1524 else
1525 {
1526 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1527 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1528 goto err;
1529 }
1530 }
1531
1532 if (q != (p+l))
1533 {
1534 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1535 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1536 goto err;
1537 }
1538 if (!sk_X509_NAME_push(ca_sk,xn))
1539 {
1540 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1541 goto err;
1542 }
1543
1544 p+=l;
1545 nc+=l+2;
1546 }
1547
1548 if (0)
1549 {
1550 cont:
1551 ERR_clear_error();
1552 }
1553
1554 /* we should setup a certificate to return.... */
1555 s->s3->tmp.cert_req=1;
1556 s->s3->tmp.ctype_num=ctype_num;
1557 if (s->s3->tmp.ca_names != NULL)
1558 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1559 s->s3->tmp.ca_names=ca_sk;
1560 ca_sk=NULL;
1561
1562 ret=1;
1563 err:
1564 if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1565 return(ret);
1566 }
1567
1568 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1569 {
1570 return(X509_NAME_cmp(*a,*b));
1571 }
1572
1573 int ssl3_get_server_done(SSL *s)
1574 {
1575 int ok,ret=0;
1576 long n;
1577
1578 n=s->method->ssl_get_message(s,
1579 SSL3_ST_CR_SRVR_DONE_A,
1580 SSL3_ST_CR_SRVR_DONE_B,
1581 SSL3_MT_SERVER_DONE,
1582 30, /* should be very small, like 0 :-) */
1583 &ok);
1584
1585 if (!ok) return((int)n);
1586 if (n > 0)
1587 {
1588 /* should contain no data */
1589 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1590 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1591 return -1;
1592 }
1593 ret=1;
1594 return(ret);
1595 }
1596
1597
1598 static const int KDF1_SHA1_len = 20;
1599 static void *KDF1_SHA1(const void *in, size_t inlen, void *out, size_t *outlen)
1600 {
1601 #ifndef OPENSSL_NO_SHA
1602 if (*outlen < SHA_DIGEST_LENGTH)
1603 return NULL;
1604 else
1605 *outlen = SHA_DIGEST_LENGTH;
1606 return SHA1(in, inlen, out);
1607 #else
1608 return NULL;
1609 #endif
1610 }
1611
1612 int ssl3_send_client_key_exchange(SSL *s)
1613 {
1614 unsigned char *p,*d;
1615 int n;
1616 unsigned long l;
1617 #ifndef OPENSSL_NO_RSA
1618 unsigned char *q;
1619 EVP_PKEY *pkey=NULL;
1620 #endif
1621 #ifndef OPENSSL_NO_KRB5
1622 KSSL_ERR kssl_err;
1623 #endif /* OPENSSL_NO_KRB5 */
1624 #ifndef OPENSSL_NO_ECDH
1625 EC_KEY *clnt_ecdh = NULL;
1626 EC_POINT *srvr_ecpoint = NULL;
1627 EVP_PKEY *srvr_pub_pkey = NULL;
1628 unsigned char *encodedPoint = NULL;
1629 int encoded_pt_len = 0;
1630 BN_CTX * bn_ctx = NULL;
1631 #endif
1632
1633 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1634 {
1635 d=(unsigned char *)s->init_buf->data;
1636 p= &(d[4]);
1637
1638 l=s->s3->tmp.new_cipher->algorithms;
1639
1640 /* Fool emacs indentation */
1641 if (0) {}
1642 #ifndef OPENSSL_NO_RSA
1643 else if (l & SSL_kRSA)
1644 {
1645 RSA *rsa;
1646 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1647
1648 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1649 rsa=s->session->sess_cert->peer_rsa_tmp;
1650 else
1651 {
1652 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1653 if ((pkey == NULL) ||
1654 (pkey->type != EVP_PKEY_RSA) ||
1655 (pkey->pkey.rsa == NULL))
1656 {
1657 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1658 goto err;
1659 }
1660 rsa=pkey->pkey.rsa;
1661 EVP_PKEY_free(pkey);
1662 }
1663
1664 tmp_buf[0]=s->client_version>>8;
1665 tmp_buf[1]=s->client_version&0xff;
1666 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1667 goto err;
1668
1669 s->session->master_key_length=sizeof tmp_buf;
1670
1671 q=p;
1672 /* Fix buf for TLS and beyond */
1673 if (s->version > SSL3_VERSION)
1674 p+=2;
1675 n=RSA_public_encrypt(sizeof tmp_buf,
1676 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1677 #ifdef PKCS1_CHECK
1678 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1679 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1680 #endif
1681 if (n <= 0)
1682 {
1683 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1684 goto err;
1685 }
1686
1687 /* Fix buf for TLS and beyond */
1688 if (s->version > SSL3_VERSION)
1689 {
1690 s2n(n,q);
1691 n+=2;
1692 }
1693
1694 s->session->master_key_length=
1695 s->method->ssl3_enc->generate_master_secret(s,
1696 s->session->master_key,
1697 tmp_buf,sizeof tmp_buf);
1698 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1699 }
1700 #endif
1701 #ifndef OPENSSL_NO_KRB5
1702 else if (l & SSL_kKRB5)
1703 {
1704 krb5_error_code krb5rc;
1705 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1706 /* krb5_data krb5_ap_req; */
1707 krb5_data *enc_ticket;
1708 krb5_data authenticator, *authp = NULL;
1709 EVP_CIPHER_CTX ciph_ctx;
1710 EVP_CIPHER *enc = NULL;
1711 unsigned char iv[EVP_MAX_IV_LENGTH];
1712 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1713 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
1714 + EVP_MAX_IV_LENGTH];
1715 int padl, outl = sizeof(epms);
1716
1717 EVP_CIPHER_CTX_init(&ciph_ctx);
1718
1719 #ifdef KSSL_DEBUG
1720 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1721 l, SSL_kKRB5);
1722 #endif /* KSSL_DEBUG */
1723
1724 authp = NULL;
1725 #ifdef KRB5SENDAUTH
1726 if (KRB5SENDAUTH) authp = &authenticator;
1727 #endif /* KRB5SENDAUTH */
1728
1729 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1730 &kssl_err);
1731 enc = kssl_map_enc(kssl_ctx->enctype);
1732 if (enc == NULL)
1733 goto err;
1734 #ifdef KSSL_DEBUG
1735 {
1736 printf("kssl_cget_tkt rtn %d\n", krb5rc);
1737 if (krb5rc && kssl_err.text)
1738 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1739 }
1740 #endif /* KSSL_DEBUG */
1741
1742 if (krb5rc)
1743 {
1744 ssl3_send_alert(s,SSL3_AL_FATAL,
1745 SSL_AD_HANDSHAKE_FAILURE);
1746 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1747 kssl_err.reason);
1748 goto err;
1749 }
1750
1751 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
1752 ** in place of RFC 2712 KerberosWrapper, as in:
1753 **
1754 ** Send ticket (copy to *p, set n = length)
1755 ** n = krb5_ap_req.length;
1756 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1757 ** if (krb5_ap_req.data)
1758 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1759 **
1760 ** Now using real RFC 2712 KerberosWrapper
1761 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1762 ** Note: 2712 "opaque" types are here replaced
1763 ** with a 2-byte length followed by the value.
1764 ** Example:
1765 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1766 ** Where "xx xx" = length bytes. Shown here with
1767 ** optional authenticator omitted.
1768 */
1769
1770 /* KerberosWrapper.Ticket */
1771 s2n(enc_ticket->length,p);
1772 memcpy(p, enc_ticket->data, enc_ticket->length);
1773 p+= enc_ticket->length;
1774 n = enc_ticket->length + 2;
1775
1776 /* KerberosWrapper.Authenticator */
1777 if (authp && authp->length)
1778 {
1779 s2n(authp->length,p);
1780 memcpy(p, authp->data, authp->length);
1781 p+= authp->length;
1782 n+= authp->length + 2;
1783
1784 free(authp->data);
1785 authp->data = NULL;
1786 authp->length = 0;
1787 }
1788 else
1789 {
1790 s2n(0,p);/* null authenticator length */
1791 n+=2;
1792 }
1793
1794 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1795 goto err;
1796
1797 /* 20010420 VRS. Tried it this way; failed.
1798 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1799 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1800 ** kssl_ctx->length);
1801 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1802 */
1803
1804 memset(iv, 0, sizeof iv); /* per RFC 1510 */
1805 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1806 kssl_ctx->key,iv);
1807 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1808 sizeof tmp_buf);
1809 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1810 outl += padl;
1811 if (outl > sizeof epms)
1812 {
1813 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1814 goto err;
1815 }
1816 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1817
1818 /* KerberosWrapper.EncryptedPreMasterSecret */
1819 s2n(outl,p);
1820 memcpy(p, epms, outl);
1821 p+=outl;
1822 n+=outl + 2;
1823
1824 s->session->master_key_length=
1825 s->method->ssl3_enc->generate_master_secret(s,
1826 s->session->master_key,
1827 tmp_buf, sizeof tmp_buf);
1828
1829 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1830 OPENSSL_cleanse(epms, outl);
1831 }
1832 #endif
1833 #ifndef OPENSSL_NO_DH
1834 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1835 {
1836 DH *dh_srvr,*dh_clnt;
1837
1838 if (s->session->sess_cert->peer_dh_tmp != NULL)
1839 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1840 else
1841 {
1842 /* we get them from the cert */
1843 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1844 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1845 goto err;
1846 }
1847
1848 /* generate a new random key */
1849 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1850 {
1851 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1852 goto err;
1853 }
1854 if (!DH_generate_key(dh_clnt))
1855 {
1856 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1857 goto err;
1858 }
1859
1860 /* use the 'p' output buffer for the DH key, but
1861 * make sure to clear it out afterwards */
1862
1863 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1864
1865 if (n <= 0)
1866 {
1867 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1868 goto err;
1869 }
1870
1871 /* generate master key from the result */
1872 s->session->master_key_length=
1873 s->method->ssl3_enc->generate_master_secret(s,
1874 s->session->master_key,p,n);
1875 /* clean up */
1876 memset(p,0,n);
1877
1878 /* send off the data */
1879 n=BN_num_bytes(dh_clnt->pub_key);
1880 s2n(n,p);
1881 BN_bn2bin(dh_clnt->pub_key,p);
1882 n+=2;
1883
1884 DH_free(dh_clnt);
1885
1886 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1887 }
1888 #endif
1889
1890 #ifndef OPENSSL_NO_ECDH
1891 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1892 {
1893 EC_GROUP *srvr_group = NULL;
1894 int ecdh_clnt_cert = 0;
1895 int field_size = 0;
1896
1897 /* Did we send out the client's
1898 * ECDH share for use in premaster
1899 * computation as part of client certificate?
1900 * If so, set ecdh_clnt_cert to 1.
1901 */
1902 if ((l & SSL_kECDH) && (s->cert != NULL))
1903 {
1904 /* XXX: For now, we do not support client
1905 * authentication using ECDH certificates.
1906 * To add such support, one needs to add
1907 * code that checks for appropriate
1908 * conditions and sets ecdh_clnt_cert to 1.
1909 * For example, the cert have an ECC
1910 * key on the same curve as the server's
1911 * and the key should be authorized for
1912 * key agreement.
1913 *
1914 * One also needs to add code in ssl3_connect
1915 * to skip sending the certificate verify
1916 * message.
1917 *
1918 * if ((s->cert->key->privatekey != NULL) &&
1919 * (s->cert->key->privatekey->type ==
1920 * EVP_PKEY_EC) && ...)
1921 * ecdh_clnt_cert = 1;
1922 */
1923 }
1924
1925 if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1926 {
1927 srvr_group = s->session->sess_cert-> \
1928 peer_ecdh_tmp->group;
1929 srvr_ecpoint = s->session->sess_cert-> \
1930 peer_ecdh_tmp->pub_key;
1931 }
1932 else
1933 {
1934 /* Get the Server Public Key from Cert */
1935 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1936 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1937 if ((srvr_pub_pkey == NULL) ||
1938 (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1939 (srvr_pub_pkey->pkey.eckey == NULL))
1940 {
1941 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1942 ERR_R_INTERNAL_ERROR);
1943 goto err;
1944 }
1945
1946 srvr_group = srvr_pub_pkey->pkey.eckey->group;
1947 srvr_ecpoint =
1948 srvr_pub_pkey->pkey.eckey->pub_key;
1949 }
1950
1951 if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1952 {
1953 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1954 ERR_R_INTERNAL_ERROR);
1955 goto err;
1956 }
1957
1958 if ((clnt_ecdh=EC_KEY_new()) == NULL)
1959 {
1960 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1961 goto err;
1962 }
1963
1964 clnt_ecdh->group = srvr_group;
1965 if (ecdh_clnt_cert)
1966 {
1967 /* Reuse key info from our certificate
1968 * We only need our private key to perform
1969 * the ECDH computation.
1970 */
1971 clnt_ecdh->priv_key = BN_dup(s->cert->key-> \
1972 privatekey->pkey.eckey->priv_key);
1973 }
1974 else
1975 {
1976 /* Generate a new ECDH key pair */
1977 if (!(EC_KEY_generate_key(clnt_ecdh)))
1978 {
1979 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1980 goto err;
1981 }
1982 }
1983
1984 /* use the 'p' output buffer for the ECDH key, but
1985 * make sure to clear it out afterwards
1986 */
1987
1988 field_size = EC_GROUP_get_degree(clnt_ecdh->group);
1989 if (field_size <= 0)
1990 {
1991 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1992 ERR_R_ECDH_LIB);
1993 goto err;
1994 }
1995 /* If field size is not more than 24 octets, then use SHA-1 hash of result;
1996 * otherwise, use result (see section 4.8 of draft-ietf-tls-ecc-03.txt;
1997 * this is new with this version of the Internet Draft).
1998 */
1999 if (field_size <= 24 * 8)
2000 n=ECDH_compute_key(p, KDF1_SHA1_len, srvr_ecpoint, clnt_ecdh, KDF1_SHA1);
2001 else
2002 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2003 if (n <= 0)
2004 {
2005 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2006 ERR_R_ECDH_LIB);
2007 goto err;
2008 }
2009
2010 /* generate master key from the result */
2011 s->session->master_key_length = s->method->ssl3_enc \
2012 -> generate_master_secret(s,
2013 s->session->master_key,
2014 p, n);
2015
2016 memset(p, 0, n); /* clean up */
2017
2018 if (ecdh_clnt_cert)
2019 {
2020 /* Send empty client key exch message */
2021 n = 0;
2022 }
2023 else
2024 {
2025 /* First check the size of encoding and
2026 * allocate memory accordingly.
2027 */
2028 encoded_pt_len =
2029 EC_POINT_point2oct(clnt_ecdh->group,
2030 clnt_ecdh->pub_key,
2031 POINT_CONVERSION_UNCOMPRESSED,
2032 NULL, 0, NULL);
2033
2034 encodedPoint = (unsigned char *)
2035 OPENSSL_malloc(encoded_pt_len *
2036 sizeof(unsigned char));
2037 bn_ctx = BN_CTX_new();
2038 if ((encodedPoint == NULL) ||
2039 (bn_ctx == NULL))
2040 {
2041 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2042 goto err;
2043 }
2044
2045 /* Encode the public key */
2046 n = EC_POINT_point2oct(clnt_ecdh->group,
2047 clnt_ecdh->pub_key,
2048 POINT_CONVERSION_UNCOMPRESSED,
2049 encodedPoint, encoded_pt_len, bn_ctx);
2050
2051 *p = n; /* length of encoded point */
2052 /* Encoded point will be copied here */
2053 p += 1;
2054 /* copy the point */
2055 memcpy((unsigned char *)p, encodedPoint, n);
2056 /* increment n to account for length field */
2057 n += 1;
2058 }
2059
2060 /* Free allocated memory */
2061 BN_CTX_free(bn_ctx);
2062 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2063 if (clnt_ecdh != NULL)
2064 {
2065 /* group is shared */
2066 clnt_ecdh->group = NULL;
2067 EC_KEY_free(clnt_ecdh);
2068 }
2069 EVP_PKEY_free(srvr_pub_pkey);
2070 }
2071 #endif /* !OPENSSL_NO_ECDH */
2072 else
2073 {
2074 ssl3_send_alert(s, SSL3_AL_FATAL,
2075 SSL_AD_HANDSHAKE_FAILURE);
2076 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2077 ERR_R_INTERNAL_ERROR);
2078 goto err;
2079 }
2080
2081 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2082 l2n3(n,d);
2083
2084 s->state=SSL3_ST_CW_KEY_EXCH_B;
2085 /* number of bytes to write */
2086 s->init_num=n+4;
2087 s->init_off=0;
2088 }
2089
2090 /* SSL3_ST_CW_KEY_EXCH_B */
2091 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2092 err:
2093 #ifndef OPENSSL_NO_ECDH
2094 BN_CTX_free(bn_ctx);
2095 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2096 if (clnt_ecdh != NULL)
2097 {
2098 /* group is shared */
2099 clnt_ecdh->group = NULL;
2100 EC_KEY_free(clnt_ecdh);
2101 }
2102 EVP_PKEY_free(srvr_pub_pkey);
2103 #endif
2104 return(-1);
2105 }
2106
2107 int ssl3_send_client_verify(SSL *s)
2108 {
2109 unsigned char *p,*d;
2110 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2111 EVP_PKEY *pkey;
2112 #ifndef OPENSSL_NO_RSA
2113 unsigned u=0;
2114 #endif
2115 unsigned long n;
2116 #ifndef OPENSSL_NO_DSA
2117 int j;
2118 #endif
2119
2120 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2121 {
2122 d=(unsigned char *)s->init_buf->data;
2123 p= &(d[4]);
2124 pkey=s->cert->key->privatekey;
2125
2126 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2127 &(data[MD5_DIGEST_LENGTH]));
2128
2129 #ifndef OPENSSL_NO_RSA
2130 if (pkey->type == EVP_PKEY_RSA)
2131 {
2132 s->method->ssl3_enc->cert_verify_mac(s,
2133 &(s->s3->finish_dgst1),&(data[0]));
2134 if (RSA_sign(NID_md5_sha1, data,
2135 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2136 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2137 {
2138 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2139 goto err;
2140 }
2141 s2n(u,p);
2142 n=u+2;
2143 }
2144 else
2145 #endif
2146 #ifndef OPENSSL_NO_DSA
2147 if (pkey->type == EVP_PKEY_DSA)
2148 {
2149 if (!DSA_sign(pkey->save_type,
2150 &(data[MD5_DIGEST_LENGTH]),
2151 SHA_DIGEST_LENGTH,&(p[2]),
2152 (unsigned int *)&j,pkey->pkey.dsa))
2153 {
2154 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2155 goto err;
2156 }
2157 s2n(j,p);
2158 n=j+2;
2159 }
2160 else
2161 #endif
2162 #ifndef OPENSSL_NO_ECDSA
2163 if (pkey->type == EVP_PKEY_EC)
2164 {
2165 if (!ECDSA_sign(pkey->save_type,
2166 &(data[MD5_DIGEST_LENGTH]),
2167 SHA_DIGEST_LENGTH,&(p[2]),
2168 (unsigned int *)&j,pkey->pkey.eckey))
2169 {
2170 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2171 ERR_R_ECDSA_LIB);
2172 goto err;
2173 }
2174 s2n(j,p);
2175 n=j+2;
2176 }
2177 else
2178 #endif
2179 {
2180 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2181 goto err;
2182 }
2183 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2184 l2n3(n,d);
2185
2186 s->state=SSL3_ST_CW_CERT_VRFY_B;
2187 s->init_num=(int)n+4;
2188 s->init_off=0;
2189 }
2190 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2191 err:
2192 return(-1);
2193 }
2194
2195 int ssl3_send_client_certificate(SSL *s)
2196 {
2197 X509 *x509=NULL;
2198 EVP_PKEY *pkey=NULL;
2199 int i;
2200 unsigned long l;
2201
2202 if (s->state == SSL3_ST_CW_CERT_A)
2203 {
2204 if ((s->cert == NULL) ||
2205 (s->cert->key->x509 == NULL) ||
2206 (s->cert->key->privatekey == NULL))
2207 s->state=SSL3_ST_CW_CERT_B;
2208 else
2209 s->state=SSL3_ST_CW_CERT_C;
2210 }
2211
2212 /* We need to get a client cert */
2213 if (s->state == SSL3_ST_CW_CERT_B)
2214 {
2215 /* If we get an error, we need to
2216 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2217 * We then get retied later */
2218 i=0;
2219 if (s->ctx->client_cert_cb != NULL)
2220 i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2221 if (i < 0)
2222 {
2223 s->rwstate=SSL_X509_LOOKUP;
2224 return(-1);
2225 }
2226 s->rwstate=SSL_NOTHING;
2227 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2228 {
2229 s->state=SSL3_ST_CW_CERT_B;
2230 if ( !SSL_use_certificate(s,x509) ||
2231 !SSL_use_PrivateKey(s,pkey))
2232 i=0;
2233 }
2234 else if (i == 1)
2235 {
2236 i=0;
2237 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2238 }
2239
2240 if (x509 != NULL) X509_free(x509);
2241 if (pkey != NULL) EVP_PKEY_free(pkey);
2242 if (i == 0)
2243 {
2244 if (s->version == SSL3_VERSION)
2245 {
2246 s->s3->tmp.cert_req=0;
2247 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2248 return(1);
2249 }
2250 else
2251 {
2252 s->s3->tmp.cert_req=2;
2253 }
2254 }
2255
2256 /* Ok, we have a cert */
2257 s->state=SSL3_ST_CW_CERT_C;
2258 }
2259
2260 if (s->state == SSL3_ST_CW_CERT_C)
2261 {
2262 s->state=SSL3_ST_CW_CERT_D;
2263 l=ssl3_output_cert_chain(s,
2264 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2265 s->init_num=(int)l;
2266 s->init_off=0;
2267 }
2268 /* SSL3_ST_CW_CERT_D */
2269 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2270 }
2271
2272 #define has_bits(i,m) (((i)&(m)) == (m))
2273
2274 int ssl3_check_cert_and_algorithm(SSL *s)
2275 {
2276 int i,idx;
2277 long algs;
2278 EVP_PKEY *pkey=NULL;
2279 SESS_CERT *sc;
2280 #ifndef OPENSSL_NO_RSA
2281 RSA *rsa;
2282 #endif
2283 #ifndef OPENSSL_NO_DH
2284 DH *dh;
2285 #endif
2286
2287 sc=s->session->sess_cert;
2288
2289 if (sc == NULL)
2290 {
2291 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2292 goto err;
2293 }
2294
2295 algs=s->s3->tmp.new_cipher->algorithms;
2296
2297 /* we don't have a certificate */
2298 if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2299 return(1);
2300
2301 #ifndef OPENSSL_NO_RSA
2302 rsa=s->session->sess_cert->peer_rsa_tmp;
2303 #endif
2304 #ifndef OPENSSL_NO_DH
2305 dh=s->session->sess_cert->peer_dh_tmp;
2306 #endif
2307
2308 /* This is the passed certificate */
2309
2310 idx=sc->peer_cert_type;
2311 #ifndef OPENSSL_NO_ECDH
2312 if (idx == SSL_PKEY_ECC)
2313 {
2314 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2315 s->s3->tmp.new_cipher) == 0)
2316 { /* check failed */
2317 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2318 goto f_err;
2319 }
2320 else
2321 {
2322 return 1;
2323 }
2324 }
2325 #endif
2326 pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2327 i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2328 EVP_PKEY_free(pkey);
2329
2330
2331 /* Check that we have a certificate if we require one */
2332 if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2333 {
2334 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2335 goto f_err;
2336 }
2337 #ifndef OPENSSL_NO_DSA
2338 else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2339 {
2340 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2341 goto f_err;
2342 }
2343 #endif
2344 #ifndef OPENSSL_NO_RSA
2345 if ((algs & SSL_kRSA) &&
2346 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2347 {
2348 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2349 goto f_err;
2350 }
2351 #endif
2352 #ifndef OPENSSL_NO_DH
2353 if ((algs & SSL_kEDH) &&
2354 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2355 {
2356 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2357 goto f_err;
2358 }
2359 else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2360 {
2361 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2362 goto f_err;
2363 }
2364 #ifndef OPENSSL_NO_DSA
2365 else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2366 {
2367 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2368 goto f_err;
2369 }
2370 #endif
2371 #endif
2372
2373 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2374 {
2375 #ifndef OPENSSL_NO_RSA
2376 if (algs & SSL_kRSA)
2377 {
2378 if (rsa == NULL
2379 || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2380 {
2381 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2382 goto f_err;
2383 }
2384 }
2385 else
2386 #endif
2387 #ifndef OPENSSL_NO_DH
2388 if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2389 {
2390 if (dh == NULL
2391 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2392 {
2393 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2394 goto f_err;
2395 }
2396 }
2397 else
2398 #endif
2399 {
2400 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2401 goto f_err;
2402 }
2403 }
2404 return(1);
2405 f_err:
2406 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2407 err:
2408 return(0);
2409 }
2410
2411
2412 #ifndef OPENSSL_NO_ECDH
2413 /* This is the complement of nid2curve_id in s3_srvr.c. */
2414 static int curve_id2nid(int curve_id)
2415 {
2416 /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2417 * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2418 static int nid_list[26] =
2419 {
2420 0,
2421 NID_sect163k1, /* sect163k1 (1) */
2422 NID_sect163r1, /* sect163r1 (2) */
2423 NID_sect163r2, /* sect163r2 (3) */
2424 NID_sect193r1, /* sect193r1 (4) */
2425 NID_sect193r2, /* sect193r2 (5) */
2426 NID_sect233k1, /* sect233k1 (6) */
2427 NID_sect233r1, /* sect233r1 (7) */
2428 NID_sect239k1, /* sect239k1 (8) */
2429 NID_sect283k1, /* sect283k1 (9) */
2430 NID_sect283r1, /* sect283r1 (10) */
2431 NID_sect409k1, /* sect409k1 (11) */
2432 NID_sect409r1, /* sect409r1 (12) */
2433 NID_sect571k1, /* sect571k1 (13) */
2434 NID_sect571r1, /* sect571r1 (14) */
2435 NID_secp160k1, /* secp160k1 (15) */
2436 NID_secp160r1, /* secp160r1 (16) */
2437 NID_secp160r2, /* secp160r2 (17) */
2438 NID_secp192k1, /* secp192k1 (18) */
2439 NID_X9_62_prime192v1, /* secp192r1 (19) */
2440 NID_secp224k1, /* secp224k1 (20) */
2441 NID_secp224r1, /* secp224r1 (21) */
2442 NID_secp256k1, /* secp256k1 (22) */
2443 NID_X9_62_prime256v1, /* secp256r1 (23) */
2444 NID_secp384r1, /* secp384r1 (24) */
2445 NID_secp521r1 /* secp521r1 (25) */
2446 };
2447
2448 if ((curve_id < 1) || (curve_id > 25)) return 0;
2449
2450 return nid_list[curve_id];
2451 }
2452 #endif
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