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there is no minimum length for session IDs
[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) 1998-2002 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111 /* ====================================================================
112 * 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 * In addition, Sun covenants to all licensees who provide a reciprocal
121 * covenant with respect to their own patents if any, not to sue under
122 * current and future patent claims necessarily infringed by the making,
123 * using, practicing, selling, offering for sale and/or otherwise
124 * disposing of the Contribution as delivered hereunder
125 * (or portions thereof), provided that such covenant shall not apply:
126 * 1) for code that a licensee deletes from the Contribution;
127 * 2) separates from the Contribution; or
128 * 3) for infringements caused by:
129 * i) the modification of the Contribution or
130 * ii) the combination of the Contribution with other software or
131 * devices where such combination causes the infringement.
132 *
133 * ECC cipher suite support in OpenSSL originally written by
134 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
135 *
136 */
137
138 #include <stdio.h>
139 #include "ssl_locl.h"
140 #include "kssl_lcl.h"
141 #include <openssl/buffer.h>
142 #include <openssl/rand.h>
143 #include <openssl/objects.h>
144 #include <openssl/evp.h>
145 #include <openssl/md5.h>
146 #include "cryptlib.h"
147
148 static SSL_METHOD *ssl3_get_client_method(int ver);
149 static int ssl3_client_hello(SSL *s);
150 static int ssl3_get_server_hello(SSL *s);
151 static int ssl3_get_certificate_request(SSL *s);
152 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
153 static int ssl3_get_server_done(SSL *s);
154 static int ssl3_send_client_verify(SSL *s);
155 static int ssl3_send_client_certificate(SSL *s);
156 static int ssl3_send_client_key_exchange(SSL *s);
157 static int ssl3_get_key_exchange(SSL *s);
158 static int ssl3_get_server_certificate(SSL *s);
159 static int ssl3_check_cert_and_algorithm(SSL *s);
160
161 #ifndef OPENSSL_NO_ECDH
162 static int curve_id2nid(int curve_id);
163 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
164 #endif
165
166 static SSL_METHOD *ssl3_get_client_method(int ver)
167 {
168 if (ver == SSL3_VERSION)
169 return(SSLv3_client_method());
170 else
171 return(NULL);
172 }
173
174 SSL_METHOD *SSLv3_client_method(void)
175 {
176 static int init=1;
177 static SSL_METHOD SSLv3_client_data;
178
179 if (init)
180 {
181 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
182 sizeof(SSL_METHOD));
183 SSLv3_client_data.ssl_connect=ssl3_connect;
184 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
185 init=0;
186 }
187 return(&SSLv3_client_data);
188 }
189
190 int ssl3_connect(SSL *s)
191 {
192 BUF_MEM *buf;
193 unsigned long Time=time(NULL),l;
194 long num1;
195 void (*cb)(const SSL *ssl,int type,int val)=NULL;
196 int ret= -1;
197 int new_state,state,skip=0;;
198
199 RAND_add(&Time,sizeof(Time),0);
200 ERR_clear_error();
201 clear_sys_error();
202
203 if (s->info_callback != NULL)
204 cb=s->info_callback;
205 else if (s->ctx->info_callback != NULL)
206 cb=s->ctx->info_callback;
207
208 s->in_handshake++;
209 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
210
211 for (;;)
212 {
213 state=s->state;
214
215 switch(s->state)
216 {
217 case SSL_ST_RENEGOTIATE:
218 s->new_session=1;
219 s->state=SSL_ST_CONNECT;
220 s->ctx->stats.sess_connect_renegotiate++;
221 /* break */
222 case SSL_ST_BEFORE:
223 case SSL_ST_CONNECT:
224 case SSL_ST_BEFORE|SSL_ST_CONNECT:
225 case SSL_ST_OK|SSL_ST_CONNECT:
226
227 s->server=0;
228 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
229
230 if ((s->version & 0xff00 ) != 0x0300)
231 {
232 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
233 ret = -1;
234 goto end;
235 }
236
237 /* s->version=SSL3_VERSION; */
238 s->type=SSL_ST_CONNECT;
239
240 if (s->init_buf == NULL)
241 {
242 if ((buf=BUF_MEM_new()) == NULL)
243 {
244 ret= -1;
245 goto end;
246 }
247 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
248 {
249 ret= -1;
250 goto end;
251 }
252 s->init_buf=buf;
253 }
254
255 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
256
257 /* setup buffing BIO */
258 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
259
260 /* don't push the buffering BIO quite yet */
261
262 ssl3_init_finished_mac(s);
263
264 s->state=SSL3_ST_CW_CLNT_HELLO_A;
265 s->ctx->stats.sess_connect++;
266 s->init_num=0;
267 break;
268
269 case SSL3_ST_CW_CLNT_HELLO_A:
270 case SSL3_ST_CW_CLNT_HELLO_B:
271
272 s->shutdown=0;
273 ret=ssl3_client_hello(s);
274 if (ret <= 0) goto end;
275 s->state=SSL3_ST_CR_SRVR_HELLO_A;
276 s->init_num=0;
277
278 /* turn on buffering for the next lot of output */
279 if (s->bbio != s->wbio)
280 s->wbio=BIO_push(s->bbio,s->wbio);
281
282 break;
283
284 case SSL3_ST_CR_SRVR_HELLO_A:
285 case SSL3_ST_CR_SRVR_HELLO_B:
286 ret=ssl3_get_server_hello(s);
287 if (ret <= 0) goto end;
288 if (s->hit)
289 s->state=SSL3_ST_CR_FINISHED_A;
290 else
291 s->state=SSL3_ST_CR_CERT_A;
292 s->init_num=0;
293 break;
294
295 case SSL3_ST_CR_CERT_A:
296 case SSL3_ST_CR_CERT_B:
297 /* Check if it is anon DH/ECDH */
298 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
299 {
300 ret=ssl3_get_server_certificate(s);
301 if (ret <= 0) goto end;
302 }
303 else
304 skip=1;
305 s->state=SSL3_ST_CR_KEY_EXCH_A;
306 s->init_num=0;
307 break;
308
309 case SSL3_ST_CR_KEY_EXCH_A:
310 case SSL3_ST_CR_KEY_EXCH_B:
311 ret=ssl3_get_key_exchange(s);
312 if (ret <= 0) goto end;
313 s->state=SSL3_ST_CR_CERT_REQ_A;
314 s->init_num=0;
315
316 /* at this point we check that we have the
317 * required stuff from the server */
318 if (!ssl3_check_cert_and_algorithm(s))
319 {
320 ret= -1;
321 goto end;
322 }
323 break;
324
325 case SSL3_ST_CR_CERT_REQ_A:
326 case SSL3_ST_CR_CERT_REQ_B:
327 ret=ssl3_get_certificate_request(s);
328 if (ret <= 0) goto end;
329 s->state=SSL3_ST_CR_SRVR_DONE_A;
330 s->init_num=0;
331 break;
332
333 case SSL3_ST_CR_SRVR_DONE_A:
334 case SSL3_ST_CR_SRVR_DONE_B:
335 ret=ssl3_get_server_done(s);
336 if (ret <= 0) goto end;
337 if (s->s3->tmp.cert_req)
338 s->state=SSL3_ST_CW_CERT_A;
339 else
340 s->state=SSL3_ST_CW_KEY_EXCH_A;
341 s->init_num=0;
342
343 break;
344
345 case SSL3_ST_CW_CERT_A:
346 case SSL3_ST_CW_CERT_B:
347 case SSL3_ST_CW_CERT_C:
348 case SSL3_ST_CW_CERT_D:
349 ret=ssl3_send_client_certificate(s);
350 if (ret <= 0) goto end;
351 s->state=SSL3_ST_CW_KEY_EXCH_A;
352 s->init_num=0;
353 break;
354
355 case SSL3_ST_CW_KEY_EXCH_A:
356 case SSL3_ST_CW_KEY_EXCH_B:
357 ret=ssl3_send_client_key_exchange(s);
358 if (ret <= 0) goto end;
359 l=s->s3->tmp.new_cipher->algorithms;
360 /* EAY EAY EAY need to check for DH fix cert
361 * sent back */
362 /* For TLS, cert_req is set to 2, so a cert chain
363 * of nothing is sent, but no verify packet is sent */
364 /* XXX: For now, we do not support client
365 * authentication in ECDH cipher suites with
366 * ECDH (rather than ECDSA) certificates.
367 * We need to skip the certificate verify
368 * message when client's ECDH public key is sent
369 * inside the client certificate.
370 */
371 if (s->s3->tmp.cert_req == 1)
372 {
373 s->state=SSL3_ST_CW_CERT_VRFY_A;
374 }
375 else
376 {
377 s->state=SSL3_ST_CW_CHANGE_A;
378 s->s3->change_cipher_spec=0;
379 }
380
381 s->init_num=0;
382 break;
383
384 case SSL3_ST_CW_CERT_VRFY_A:
385 case SSL3_ST_CW_CERT_VRFY_B:
386 ret=ssl3_send_client_verify(s);
387 if (ret <= 0) goto end;
388 s->state=SSL3_ST_CW_CHANGE_A;
389 s->init_num=0;
390 s->s3->change_cipher_spec=0;
391 break;
392
393 case SSL3_ST_CW_CHANGE_A:
394 case SSL3_ST_CW_CHANGE_B:
395 ret=ssl3_send_change_cipher_spec(s,
396 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
397 if (ret <= 0) goto end;
398 s->state=SSL3_ST_CW_FINISHED_A;
399 s->init_num=0;
400
401 s->session->cipher=s->s3->tmp.new_cipher;
402 if (s->s3->tmp.new_compression == NULL)
403 s->session->compress_meth=0;
404 else
405 s->session->compress_meth=
406 s->s3->tmp.new_compression->id;
407 if (!s->method->ssl3_enc->setup_key_block(s))
408 {
409 ret= -1;
410 goto end;
411 }
412
413 if (!s->method->ssl3_enc->change_cipher_state(s,
414 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
415 {
416 ret= -1;
417 goto end;
418 }
419
420 break;
421
422 case SSL3_ST_CW_FINISHED_A:
423 case SSL3_ST_CW_FINISHED_B:
424 ret=ssl3_send_finished(s,
425 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
426 s->method->ssl3_enc->client_finished_label,
427 s->method->ssl3_enc->client_finished_label_len);
428 if (ret <= 0) goto end;
429 s->state=SSL3_ST_CW_FLUSH;
430
431 /* clear flags */
432 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
433 if (s->hit)
434 {
435 s->s3->tmp.next_state=SSL_ST_OK;
436 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
437 {
438 s->state=SSL_ST_OK;
439 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
440 s->s3->delay_buf_pop_ret=0;
441 }
442 }
443 else
444 {
445 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
446 }
447 s->init_num=0;
448 break;
449
450 case SSL3_ST_CR_FINISHED_A:
451 case SSL3_ST_CR_FINISHED_B:
452
453 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
454 SSL3_ST_CR_FINISHED_B);
455 if (ret <= 0) goto end;
456
457 if (s->hit)
458 s->state=SSL3_ST_CW_CHANGE_A;
459 else
460 s->state=SSL_ST_OK;
461 s->init_num=0;
462 break;
463
464 case SSL3_ST_CW_FLUSH:
465 /* number of bytes to be flushed */
466 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
467 if (num1 > 0)
468 {
469 s->rwstate=SSL_WRITING;
470 num1=BIO_flush(s->wbio);
471 if (num1 <= 0) { ret= -1; goto end; }
472 s->rwstate=SSL_NOTHING;
473 }
474
475 s->state=s->s3->tmp.next_state;
476 break;
477
478 case SSL_ST_OK:
479 /* clean a few things up */
480 ssl3_cleanup_key_block(s);
481
482 if (s->init_buf != NULL)
483 {
484 BUF_MEM_free(s->init_buf);
485 s->init_buf=NULL;
486 }
487
488 /* If we are not 'joining' the last two packets,
489 * remove the buffering now */
490 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
491 ssl_free_wbio_buffer(s);
492 /* else do it later in ssl3_write */
493
494 s->init_num=0;
495 s->new_session=0;
496
497 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
498 if (s->hit) s->ctx->stats.sess_hit++;
499
500 ret=1;
501 /* s->server=0; */
502 s->handshake_func=ssl3_connect;
503 s->ctx->stats.sess_connect_good++;
504
505 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
506
507 goto end;
508 /* break; */
509
510 default:
511 SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
512 ret= -1;
513 goto end;
514 /* break; */
515 }
516
517 /* did we do anything */
518 if (!s->s3->tmp.reuse_message && !skip)
519 {
520 if (s->debug)
521 {
522 if ((ret=BIO_flush(s->wbio)) <= 0)
523 goto end;
524 }
525
526 if ((cb != NULL) && (s->state != state))
527 {
528 new_state=s->state;
529 s->state=state;
530 cb(s,SSL_CB_CONNECT_LOOP,1);
531 s->state=new_state;
532 }
533 }
534 skip=0;
535 }
536 end:
537 s->in_handshake--;
538 if (cb != NULL)
539 cb(s,SSL_CB_CONNECT_EXIT,ret);
540 return(ret);
541 }
542
543
544 static int ssl3_client_hello(SSL *s)
545 {
546 unsigned char *buf;
547 unsigned char *p,*d;
548 int i,j;
549 unsigned long Time,l;
550 SSL_COMP *comp;
551
552 buf=(unsigned char *)s->init_buf->data;
553 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
554 {
555 if ((s->session == NULL) ||
556 (s->session->ssl_version != s->version) ||
557 (s->session->not_resumable))
558 {
559 if (!ssl_get_new_session(s,0))
560 goto err;
561 }
562 /* else use the pre-loaded session */
563
564 p=s->s3->client_random;
565 Time=time(NULL); /* Time */
566 l2n(Time,p);
567 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
568
569 /* Do the message type and length last */
570 d=p= &(buf[4]);
571
572 *(p++)=s->version>>8;
573 *(p++)=s->version&0xff;
574 s->client_version=s->version;
575
576 /* Random stuff */
577 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
578 p+=SSL3_RANDOM_SIZE;
579
580 /* Session ID */
581 if (s->new_session)
582 i=0;
583 else
584 i=s->session->session_id_length;
585 *(p++)=i;
586 if (i != 0)
587 {
588 if (i > sizeof s->session->session_id)
589 {
590 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
591 goto err;
592 }
593 memcpy(p,s->session->session_id,i);
594 p+=i;
595 }
596
597 /* Ciphers supported */
598 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
599 if (i == 0)
600 {
601 SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
602 goto err;
603 }
604 s2n(i,p);
605 p+=i;
606
607 /* COMPRESSION */
608 if (s->ctx->comp_methods == NULL)
609 j=0;
610 else
611 j=sk_SSL_COMP_num(s->ctx->comp_methods);
612 *(p++)=1+j;
613 for (i=0; i<j; i++)
614 {
615 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
616 *(p++)=comp->id;
617 }
618 *(p++)=0; /* Add the NULL method */
619
620 l=(p-d);
621 d=buf;
622 *(d++)=SSL3_MT_CLIENT_HELLO;
623 l2n3(l,d);
624
625 s->state=SSL3_ST_CW_CLNT_HELLO_B;
626 /* number of bytes to write */
627 s->init_num=p-buf;
628 s->init_off=0;
629 }
630
631 /* SSL3_ST_CW_CLNT_HELLO_B */
632 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
633 err:
634 return(-1);
635 }
636
637 static int ssl3_get_server_hello(SSL *s)
638 {
639 STACK_OF(SSL_CIPHER) *sk;
640 SSL_CIPHER *c;
641 unsigned char *p,*d;
642 int i,al,ok;
643 unsigned int j;
644 long n;
645 SSL_COMP *comp;
646
647 n=ssl3_get_message(s,
648 SSL3_ST_CR_SRVR_HELLO_A,
649 SSL3_ST_CR_SRVR_HELLO_B,
650 SSL3_MT_SERVER_HELLO,
651 300, /* ?? */
652 &ok);
653
654 if (!ok) return((int)n);
655 d=p=(unsigned char *)s->init_msg;
656
657 if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
658 {
659 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
660 s->version=(s->version&0xff00)|p[1];
661 al=SSL_AD_PROTOCOL_VERSION;
662 goto f_err;
663 }
664 p+=2;
665
666 /* load the server hello data */
667 /* load the server random */
668 memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
669 p+=SSL3_RANDOM_SIZE;
670
671 /* get the session-id */
672 j= *(p++);
673
674 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
675 {
676 al=SSL_AD_ILLEGAL_PARAMETER;
677 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
678 goto f_err;
679 }
680 if (j != 0 && j == s->session->session_id_length
681 && memcmp(p,s->session->session_id,j) == 0)
682 {
683 if(s->sid_ctx_length != s->session->sid_ctx_length
684 || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
685 {
686 /* actually a client application bug */
687 al=SSL_AD_ILLEGAL_PARAMETER;
688 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
689 goto f_err;
690 }
691 s->hit=1;
692 }
693 else /* a miss or crap from the other end */
694 {
695 /* If we were trying for session-id reuse, make a new
696 * SSL_SESSION so we don't stuff up other people */
697 s->hit=0;
698 if (s->session->session_id_length > 0)
699 {
700 if (!ssl_get_new_session(s,0))
701 {
702 al=SSL_AD_INTERNAL_ERROR;
703 goto f_err;
704 }
705 }
706 s->session->session_id_length=j;
707 memcpy(s->session->session_id,p,j); /* j could be 0 */
708 }
709 p+=j;
710 c=ssl_get_cipher_by_char(s,p);
711 if (c == NULL)
712 {
713 /* unknown cipher */
714 al=SSL_AD_ILLEGAL_PARAMETER;
715 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
716 goto f_err;
717 }
718 p+=ssl_put_cipher_by_char(s,NULL,NULL);
719
720 sk=ssl_get_ciphers_by_id(s);
721 i=sk_SSL_CIPHER_find(sk,c);
722 if (i < 0)
723 {
724 /* we did not say we would use this cipher */
725 al=SSL_AD_ILLEGAL_PARAMETER;
726 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
727 goto f_err;
728 }
729
730 if (s->hit && (s->session->cipher != c))
731 {
732 if (!(s->options &
733 SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
734 {
735 al=SSL_AD_ILLEGAL_PARAMETER;
736 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
737 goto f_err;
738 }
739 }
740 s->s3->tmp.new_cipher=c;
741
742 /* lets get the compression algorithm */
743 /* COMPRESSION */
744 j= *(p++);
745 if (j == 0)
746 comp=NULL;
747 else
748 comp=ssl3_comp_find(s->ctx->comp_methods,j);
749
750 if ((j != 0) && (comp == NULL))
751 {
752 al=SSL_AD_ILLEGAL_PARAMETER;
753 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
754 goto f_err;
755 }
756 else
757 {
758 s->s3->tmp.new_compression=comp;
759 }
760
761 if (p != (d+n))
762 {
763 /* wrong packet length */
764 al=SSL_AD_DECODE_ERROR;
765 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
766 goto err;
767 }
768
769 return(1);
770 f_err:
771 ssl3_send_alert(s,SSL3_AL_FATAL,al);
772 err:
773 return(-1);
774 }
775
776 static int ssl3_get_server_certificate(SSL *s)
777 {
778 int al,i,ok,ret= -1;
779 unsigned long n,nc,llen,l;
780 X509 *x=NULL;
781 unsigned char *p,*d,*q;
782 STACK_OF(X509) *sk=NULL;
783 SESS_CERT *sc;
784 EVP_PKEY *pkey=NULL;
785 int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
786
787 n=ssl3_get_message(s,
788 SSL3_ST_CR_CERT_A,
789 SSL3_ST_CR_CERT_B,
790 -1,
791 s->max_cert_list,
792 &ok);
793
794 if (!ok) return((int)n);
795
796 if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
797 {
798 s->s3->tmp.reuse_message=1;
799 return(1);
800 }
801
802 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
803 {
804 al=SSL_AD_UNEXPECTED_MESSAGE;
805 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
806 goto f_err;
807 }
808 d=p=(unsigned char *)s->init_msg;
809
810 if ((sk=sk_X509_new_null()) == NULL)
811 {
812 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
813 goto err;
814 }
815
816 n2l3(p,llen);
817 if (llen+3 != n)
818 {
819 al=SSL_AD_DECODE_ERROR;
820 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
821 goto f_err;
822 }
823 for (nc=0; nc<llen; )
824 {
825 n2l3(p,l);
826 if ((l+nc+3) > llen)
827 {
828 al=SSL_AD_DECODE_ERROR;
829 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
830 goto f_err;
831 }
832
833 q=p;
834 x=d2i_X509(NULL,&q,l);
835 if (x == NULL)
836 {
837 al=SSL_AD_BAD_CERTIFICATE;
838 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
839 goto f_err;
840 }
841 if (q != (p+l))
842 {
843 al=SSL_AD_DECODE_ERROR;
844 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
845 goto f_err;
846 }
847 if (!sk_X509_push(sk,x))
848 {
849 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
850 goto err;
851 }
852 x=NULL;
853 nc+=l+3;
854 p=q;
855 }
856
857 i=ssl_verify_cert_chain(s,sk);
858 if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
859 #ifndef OPENSSL_NO_KRB5
860 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
861 != (SSL_aKRB5|SSL_kKRB5)
862 #endif /* OPENSSL_NO_KRB5 */
863 )
864 {
865 al=ssl_verify_alarm_type(s->verify_result);
866 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
867 goto f_err;
868 }
869 ERR_clear_error(); /* but we keep s->verify_result */
870
871 sc=ssl_sess_cert_new();
872 if (sc == NULL) goto err;
873
874 if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
875 s->session->sess_cert=sc;
876
877 sc->cert_chain=sk;
878 /* Inconsistency alert: cert_chain does include the peer's
879 * certificate, which we don't include in s3_srvr.c */
880 x=sk_X509_value(sk,0);
881 sk=NULL;
882 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
883
884 pkey=X509_get_pubkey(x);
885
886 /* VRS: allow null cert if auth == KRB5 */
887 need_cert = ((s->s3->tmp.new_cipher->algorithms
888 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
889 == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
890
891 #ifdef KSSL_DEBUG
892 printf("pkey,x = %p, %p\n", pkey,x);
893 printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
894 printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
895 s->s3->tmp.new_cipher->algorithms, need_cert);
896 #endif /* KSSL_DEBUG */
897
898 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
899 {
900 x=NULL;
901 al=SSL3_AL_FATAL;
902 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
903 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
904 goto f_err;
905 }
906
907 i=ssl_cert_type(x,pkey);
908 if (need_cert && i < 0)
909 {
910 x=NULL;
911 al=SSL3_AL_FATAL;
912 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
913 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
914 goto f_err;
915 }
916
917 if (need_cert)
918 {
919 sc->peer_cert_type=i;
920 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
921 /* Why would the following ever happen?
922 * We just created sc a couple of lines ago. */
923 if (sc->peer_pkeys[i].x509 != NULL)
924 X509_free(sc->peer_pkeys[i].x509);
925 sc->peer_pkeys[i].x509=x;
926 sc->peer_key= &(sc->peer_pkeys[i]);
927
928 if (s->session->peer != NULL)
929 X509_free(s->session->peer);
930 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
931 s->session->peer=x;
932 }
933 else
934 {
935 sc->peer_cert_type=i;
936 sc->peer_key= NULL;
937
938 if (s->session->peer != NULL)
939 X509_free(s->session->peer);
940 s->session->peer=NULL;
941 }
942 s->session->verify_result = s->verify_result;
943
944 x=NULL;
945 ret=1;
946
947 if (0)
948 {
949 f_err:
950 ssl3_send_alert(s,SSL3_AL_FATAL,al);
951 }
952 err:
953 EVP_PKEY_free(pkey);
954 X509_free(x);
955 sk_X509_pop_free(sk,X509_free);
956 return(ret);
957 }
958
959 static int ssl3_get_key_exchange(SSL *s)
960 {
961 #ifndef OPENSSL_NO_RSA
962 unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
963 #endif
964 EVP_MD_CTX md_ctx;
965 unsigned char *param,*p;
966 int al,i,j,param_len,ok;
967 long n,alg;
968 EVP_PKEY *pkey=NULL;
969 #ifndef OPENSSL_NO_RSA
970 RSA *rsa=NULL;
971 #endif
972 #ifndef OPENSSL_NO_DH
973 DH *dh=NULL;
974 #endif
975 #ifndef OPENSSL_NO_ECDH
976 EC_KEY *ecdh = NULL;
977 BN_CTX *bn_ctx = NULL;
978 EC_POINT *srvr_ecpoint = NULL;
979 int curve_nid = 0;
980 int encoded_pt_len = 0;
981 #endif
982
983 /* use same message size as in ssl3_get_certificate_request()
984 * as ServerKeyExchange message may be skipped */
985 n=ssl3_get_message(s,
986 SSL3_ST_CR_KEY_EXCH_A,
987 SSL3_ST_CR_KEY_EXCH_B,
988 -1,
989 s->max_cert_list,
990 &ok);
991
992 if (!ok) return((int)n);
993
994 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
995 {
996 s->s3->tmp.reuse_message=1;
997 return(1);
998 }
999
1000 param=p=(unsigned char *)s->init_msg;
1001
1002 if (s->session->sess_cert != NULL)
1003 {
1004 #ifndef OPENSSL_NO_RSA
1005 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1006 {
1007 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1008 s->session->sess_cert->peer_rsa_tmp=NULL;
1009 }
1010 #endif
1011 #ifndef OPENSSL_NO_DH
1012 if (s->session->sess_cert->peer_dh_tmp)
1013 {
1014 DH_free(s->session->sess_cert->peer_dh_tmp);
1015 s->session->sess_cert->peer_dh_tmp=NULL;
1016 }
1017 #endif
1018 #ifndef OPENSSL_NO_ECDH
1019 if (s->session->sess_cert->peer_ecdh_tmp)
1020 {
1021 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1022 s->session->sess_cert->peer_ecdh_tmp=NULL;
1023 }
1024 #endif
1025 }
1026 else
1027 {
1028 s->session->sess_cert=ssl_sess_cert_new();
1029 }
1030
1031 param_len=0;
1032 alg=s->s3->tmp.new_cipher->algorithms;
1033 EVP_MD_CTX_init(&md_ctx);
1034
1035 #ifndef OPENSSL_NO_RSA
1036 if (alg & SSL_kRSA)
1037 {
1038 if ((rsa=RSA_new()) == NULL)
1039 {
1040 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1041 goto err;
1042 }
1043 n2s(p,i);
1044 param_len=i+2;
1045 if (param_len > n)
1046 {
1047 al=SSL_AD_DECODE_ERROR;
1048 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1049 goto f_err;
1050 }
1051 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1052 {
1053 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1054 goto err;
1055 }
1056 p+=i;
1057
1058 n2s(p,i);
1059 param_len+=i+2;
1060 if (param_len > n)
1061 {
1062 al=SSL_AD_DECODE_ERROR;
1063 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1064 goto f_err;
1065 }
1066 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1067 {
1068 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1069 goto err;
1070 }
1071 p+=i;
1072 n-=param_len;
1073
1074 /* this should be because we are using an export cipher */
1075 if (alg & SSL_aRSA)
1076 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1077 else
1078 {
1079 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1080 goto err;
1081 }
1082 s->session->sess_cert->peer_rsa_tmp=rsa;
1083 rsa=NULL;
1084 }
1085 #else /* OPENSSL_NO_RSA */
1086 if (0)
1087 ;
1088 #endif
1089 #ifndef OPENSSL_NO_DH
1090 else if (alg & SSL_kEDH)
1091 {
1092 if ((dh=DH_new()) == NULL)
1093 {
1094 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1095 goto err;
1096 }
1097 n2s(p,i);
1098 param_len=i+2;
1099 if (param_len > n)
1100 {
1101 al=SSL_AD_DECODE_ERROR;
1102 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1103 goto f_err;
1104 }
1105 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1106 {
1107 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1108 goto err;
1109 }
1110 p+=i;
1111
1112 n2s(p,i);
1113 param_len+=i+2;
1114 if (param_len > n)
1115 {
1116 al=SSL_AD_DECODE_ERROR;
1117 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1118 goto f_err;
1119 }
1120 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1121 {
1122 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1123 goto err;
1124 }
1125 p+=i;
1126
1127 n2s(p,i);
1128 param_len+=i+2;
1129 if (param_len > n)
1130 {
1131 al=SSL_AD_DECODE_ERROR;
1132 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1133 goto f_err;
1134 }
1135 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1136 {
1137 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1138 goto err;
1139 }
1140 p+=i;
1141 n-=param_len;
1142
1143 #ifndef OPENSSL_NO_RSA
1144 if (alg & SSL_aRSA)
1145 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1146 #else
1147 if (0)
1148 ;
1149 #endif
1150 #ifndef OPENSSL_NO_DSA
1151 else if (alg & SSL_aDSS)
1152 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1153 #endif
1154 /* else anonymous DH, so no certificate or pkey. */
1155
1156 s->session->sess_cert->peer_dh_tmp=dh;
1157 dh=NULL;
1158 }
1159 else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1160 {
1161 al=SSL_AD_ILLEGAL_PARAMETER;
1162 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1163 goto f_err;
1164 }
1165 #endif /* !OPENSSL_NO_DH */
1166
1167 #ifndef OPENSSL_NO_ECDH
1168 else if (alg & SSL_kECDHE)
1169 {
1170 if ((ecdh=EC_KEY_new()) == NULL)
1171 {
1172 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1173 goto err;
1174 }
1175
1176 /* Extract elliptic curve parameters and the
1177 * server's ephemeral ECDH public key.
1178 * Keep accumulating lengths of various components in
1179 * param_len and make sure it never exceeds n.
1180 */
1181
1182 /* XXX: For now we only support named (not generic) curves
1183 * and the ECParameters in this case is just two bytes.
1184 */
1185 param_len=2;
1186 if ((param_len > n) ||
1187 (*p != NAMED_CURVE_TYPE) ||
1188 ((curve_nid = curve_id2nid(*(p + 1))) == 0))
1189 {
1190 al=SSL_AD_INTERNAL_ERROR;
1191 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1192 goto f_err;
1193 }
1194
1195 if (!(ecdh->group=EC_GROUP_new_by_nid(curve_nid)))
1196 {
1197 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1198 goto err;
1199 }
1200
1201 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1202 (EC_GROUP_get_degree(ecdh->group) > 163))
1203 {
1204 al=SSL_AD_EXPORT_RESTRICTION;
1205 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1206 goto f_err;
1207 }
1208
1209 p+=2;
1210
1211 /* Next, get the encoded ECPoint */
1212 if (((srvr_ecpoint = EC_POINT_new(ecdh->group)) == NULL) ||
1213 ((bn_ctx = BN_CTX_new()) == NULL))
1214 {
1215 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1216 goto err;
1217 }
1218
1219 encoded_pt_len = *p; /* length of encoded point */
1220 p+=1;
1221 param_len += (1 + encoded_pt_len);
1222 if ((param_len > n) ||
1223 (EC_POINT_oct2point(ecdh->group, srvr_ecpoint,
1224 p, encoded_pt_len, bn_ctx) == 0))
1225 {
1226 al=SSL_AD_DECODE_ERROR;
1227 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1228 goto f_err;
1229 }
1230
1231 n-=param_len;
1232 p+=encoded_pt_len;
1233
1234 /* The ECC/TLS specification does not mention
1235 * the use of DSA to sign ECParameters in the server
1236 * key exchange message. We do support RSA and ECDSA.
1237 */
1238 if (0) ;
1239 #ifndef OPENSSL_NO_RSA
1240 else if (alg & SSL_aRSA)
1241 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1242 #endif
1243 #ifndef OPENSSL_NO_ECDSA
1244 else if (alg & SSL_aECDSA)
1245 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1246 #endif
1247 /* else anonymous ECDH, so no certificate or pkey. */
1248 ecdh->pub_key = srvr_ecpoint;
1249 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1250 ecdh=NULL;
1251 BN_CTX_free(bn_ctx);
1252 srvr_ecpoint = NULL;
1253 }
1254 else if (alg & SSL_kECDH)
1255 {
1256 al=SSL_AD_UNEXPECTED_MESSAGE;
1257 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1258 goto f_err;
1259 }
1260 #endif /* !OPENSSL_NO_ECDH */
1261 if (alg & SSL_aFZA)
1262 {
1263 al=SSL_AD_HANDSHAKE_FAILURE;
1264 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1265 goto f_err;
1266 }
1267
1268
1269 /* p points to the next byte, there are 'n' bytes left */
1270
1271 /* if it was signed, check the signature */
1272 if (pkey != NULL)
1273 {
1274 n2s(p,i);
1275 n-=2;
1276 j=EVP_PKEY_size(pkey);
1277
1278 if ((i != n) || (n > j) || (n <= 0))
1279 {
1280 /* wrong packet length */
1281 al=SSL_AD_DECODE_ERROR;
1282 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1283 goto f_err;
1284 }
1285
1286 #ifndef OPENSSL_NO_RSA
1287 if (pkey->type == EVP_PKEY_RSA)
1288 {
1289 int num;
1290
1291 j=0;
1292 q=md_buf;
1293 for (num=2; num > 0; num--)
1294 {
1295 EVP_DigestInit_ex(&md_ctx,(num == 2)
1296 ?s->ctx->md5:s->ctx->sha1, NULL);
1297 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1298 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1299 EVP_DigestUpdate(&md_ctx,param,param_len);
1300 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1301 q+=i;
1302 j+=i;
1303 }
1304 i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1305 pkey->pkey.rsa);
1306 if (i < 0)
1307 {
1308 al=SSL_AD_DECRYPT_ERROR;
1309 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1310 goto f_err;
1311 }
1312 if (i == 0)
1313 {
1314 /* bad signature */
1315 al=SSL_AD_DECRYPT_ERROR;
1316 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1317 goto f_err;
1318 }
1319 }
1320 else
1321 #endif
1322 #ifndef OPENSSL_NO_DSA
1323 if (pkey->type == EVP_PKEY_DSA)
1324 {
1325 /* lets do DSS */
1326 EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1327 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1328 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1329 EVP_VerifyUpdate(&md_ctx,param,param_len);
1330 if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1331 {
1332 /* bad signature */
1333 al=SSL_AD_DECRYPT_ERROR;
1334 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1335 goto f_err;
1336 }
1337 }
1338 else
1339 #endif
1340 #ifndef OPENSSL_NO_ECDSA
1341 if (pkey->type == EVP_PKEY_EC)
1342 {
1343 /* let's do ECDSA */
1344 EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1345 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1346 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1347 EVP_VerifyUpdate(&md_ctx,param,param_len);
1348 if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1349 {
1350 /* bad signature */
1351 al=SSL_AD_DECRYPT_ERROR;
1352 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1353 goto f_err;
1354 }
1355 }
1356 else
1357 #endif
1358 {
1359 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1360 goto err;
1361 }
1362 }
1363 else
1364 {
1365 /* still data left over */
1366 if (!(alg & SSL_aNULL))
1367 {
1368 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1369 goto err;
1370 }
1371 if (n != 0)
1372 {
1373 al=SSL_AD_DECODE_ERROR;
1374 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1375 goto f_err;
1376 }
1377 }
1378 EVP_PKEY_free(pkey);
1379 EVP_MD_CTX_cleanup(&md_ctx);
1380 return(1);
1381 f_err:
1382 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1383 err:
1384 EVP_PKEY_free(pkey);
1385 #ifndef OPENSSL_NO_RSA
1386 if (rsa != NULL)
1387 RSA_free(rsa);
1388 #endif
1389 #ifndef OPENSSL_NO_DH
1390 if (dh != NULL)
1391 DH_free(dh);
1392 #endif
1393 #ifndef OPENSSL_NO_ECDH
1394 BN_CTX_free(bn_ctx);
1395 EC_POINT_free(srvr_ecpoint);
1396 if (ecdh != NULL)
1397 EC_KEY_free(ecdh);
1398 #endif
1399 EVP_MD_CTX_cleanup(&md_ctx);
1400 return(-1);
1401 }
1402
1403 static int ssl3_get_certificate_request(SSL *s)
1404 {
1405 int ok,ret=0;
1406 unsigned long n,nc,l;
1407 unsigned int llen,ctype_num,i;
1408 X509_NAME *xn=NULL;
1409 unsigned char *p,*d,*q;
1410 STACK_OF(X509_NAME) *ca_sk=NULL;
1411
1412 n=ssl3_get_message(s,
1413 SSL3_ST_CR_CERT_REQ_A,
1414 SSL3_ST_CR_CERT_REQ_B,
1415 -1,
1416 s->max_cert_list,
1417 &ok);
1418
1419 if (!ok) return((int)n);
1420
1421 s->s3->tmp.cert_req=0;
1422
1423 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1424 {
1425 s->s3->tmp.reuse_message=1;
1426 return(1);
1427 }
1428
1429 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1430 {
1431 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1432 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1433 goto err;
1434 }
1435
1436 /* TLS does not like anon-DH with client cert */
1437 if (s->version > SSL3_VERSION)
1438 {
1439 l=s->s3->tmp.new_cipher->algorithms;
1440 if (l & SSL_aNULL)
1441 {
1442 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1443 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1444 goto err;
1445 }
1446 }
1447
1448 d=p=(unsigned char *)s->init_msg;
1449
1450 if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1451 {
1452 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1453 goto err;
1454 }
1455
1456 /* get the certificate types */
1457 ctype_num= *(p++);
1458 if (ctype_num > SSL3_CT_NUMBER)
1459 ctype_num=SSL3_CT_NUMBER;
1460 for (i=0; i<ctype_num; i++)
1461 s->s3->tmp.ctype[i]= p[i];
1462 p+=ctype_num;
1463
1464 /* get the CA RDNs */
1465 n2s(p,llen);
1466 #if 0
1467 {
1468 FILE *out;
1469 out=fopen("/tmp/vsign.der","w");
1470 fwrite(p,1,llen,out);
1471 fclose(out);
1472 }
1473 #endif
1474
1475 if ((llen+ctype_num+2+1) != n)
1476 {
1477 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1478 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1479 goto err;
1480 }
1481
1482 for (nc=0; nc<llen; )
1483 {
1484 n2s(p,l);
1485 if ((l+nc+2) > llen)
1486 {
1487 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1488 goto cont; /* netscape bugs */
1489 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1490 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1491 goto err;
1492 }
1493
1494 q=p;
1495
1496 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1497 {
1498 /* If netscape tolerance is on, ignore errors */
1499 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1500 goto cont;
1501 else
1502 {
1503 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1504 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1505 goto err;
1506 }
1507 }
1508
1509 if (q != (p+l))
1510 {
1511 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1512 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1513 goto err;
1514 }
1515 if (!sk_X509_NAME_push(ca_sk,xn))
1516 {
1517 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1518 goto err;
1519 }
1520
1521 p+=l;
1522 nc+=l+2;
1523 }
1524
1525 if (0)
1526 {
1527 cont:
1528 ERR_clear_error();
1529 }
1530
1531 /* we should setup a certificate to return.... */
1532 s->s3->tmp.cert_req=1;
1533 s->s3->tmp.ctype_num=ctype_num;
1534 if (s->s3->tmp.ca_names != NULL)
1535 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1536 s->s3->tmp.ca_names=ca_sk;
1537 ca_sk=NULL;
1538
1539 ret=1;
1540 err:
1541 if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1542 return(ret);
1543 }
1544
1545 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1546 {
1547 return(X509_NAME_cmp(*a,*b));
1548 }
1549
1550 static int ssl3_get_server_done(SSL *s)
1551 {
1552 int ok,ret=0;
1553 long n;
1554
1555 n=ssl3_get_message(s,
1556 SSL3_ST_CR_SRVR_DONE_A,
1557 SSL3_ST_CR_SRVR_DONE_B,
1558 SSL3_MT_SERVER_DONE,
1559 30, /* should be very small, like 0 :-) */
1560 &ok);
1561
1562 if (!ok) return((int)n);
1563 if (n > 0)
1564 {
1565 /* should contain no data */
1566 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1567 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1568 return -1;
1569 }
1570 ret=1;
1571 return(ret);
1572 }
1573
1574 static int ssl3_send_client_key_exchange(SSL *s)
1575 {
1576 unsigned char *p,*d;
1577 int n;
1578 unsigned long l;
1579 #ifndef OPENSSL_NO_RSA
1580 unsigned char *q;
1581 EVP_PKEY *pkey=NULL;
1582 #endif
1583 #ifndef OPENSSL_NO_KRB5
1584 KSSL_ERR kssl_err;
1585 #endif /* OPENSSL_NO_KRB5 */
1586 #ifndef OPENSSL_NO_ECDH
1587 EC_KEY *clnt_ecdh = NULL;
1588 EC_POINT *srvr_ecpoint = NULL;
1589 EVP_PKEY *srvr_pub_pkey = NULL;
1590 unsigned char *encodedPoint = NULL;
1591 int encoded_pt_len = 0;
1592 BN_CTX * bn_ctx = NULL;
1593 #endif
1594
1595 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1596 {
1597 d=(unsigned char *)s->init_buf->data;
1598 p= &(d[4]);
1599
1600 l=s->s3->tmp.new_cipher->algorithms;
1601
1602 /* Fool emacs indentation */
1603 if (0) {}
1604 #ifndef OPENSSL_NO_RSA
1605 else if (l & SSL_kRSA)
1606 {
1607 RSA *rsa;
1608 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1609
1610 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1611 rsa=s->session->sess_cert->peer_rsa_tmp;
1612 else
1613 {
1614 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1615 if ((pkey == NULL) ||
1616 (pkey->type != EVP_PKEY_RSA) ||
1617 (pkey->pkey.rsa == NULL))
1618 {
1619 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1620 goto err;
1621 }
1622 rsa=pkey->pkey.rsa;
1623 EVP_PKEY_free(pkey);
1624 }
1625
1626 tmp_buf[0]=s->client_version>>8;
1627 tmp_buf[1]=s->client_version&0xff;
1628 if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1629 goto err;
1630
1631 s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1632
1633 q=p;
1634 /* Fix buf for TLS and beyond */
1635 if (s->version > SSL3_VERSION)
1636 p+=2;
1637 n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1638 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1639 #ifdef PKCS1_CHECK
1640 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1641 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1642 #endif
1643 if (n <= 0)
1644 {
1645 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1646 goto err;
1647 }
1648
1649 /* Fix buf for TLS and beyond */
1650 if (s->version > SSL3_VERSION)
1651 {
1652 s2n(n,q);
1653 n+=2;
1654 }
1655
1656 s->session->master_key_length=
1657 s->method->ssl3_enc->generate_master_secret(s,
1658 s->session->master_key,
1659 tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1660 memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1661 }
1662 #endif
1663 #ifndef OPENSSL_NO_KRB5
1664 else if (l & SSL_kKRB5)
1665 {
1666 krb5_error_code krb5rc;
1667 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1668 /* krb5_data krb5_ap_req; */
1669 krb5_data *enc_ticket;
1670 krb5_data authenticator, *authp = NULL;
1671 EVP_CIPHER_CTX ciph_ctx;
1672 EVP_CIPHER *enc = NULL;
1673 unsigned char iv[EVP_MAX_IV_LENGTH];
1674 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1675 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
1676 + EVP_MAX_IV_LENGTH];
1677 int padl, outl = sizeof(epms);
1678
1679 EVP_CIPHER_CTX_init(&ciph_ctx);
1680
1681 #ifdef KSSL_DEBUG
1682 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1683 l, SSL_kKRB5);
1684 #endif /* KSSL_DEBUG */
1685
1686 authp = NULL;
1687 #ifdef KRB5SENDAUTH
1688 if (KRB5SENDAUTH) authp = &authenticator;
1689 #endif /* KRB5SENDAUTH */
1690
1691 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1692 &kssl_err);
1693 enc = kssl_map_enc(kssl_ctx->enctype);
1694 if (enc == NULL)
1695 goto err;
1696 #ifdef KSSL_DEBUG
1697 {
1698 printf("kssl_cget_tkt rtn %d\n", krb5rc);
1699 if (krb5rc && kssl_err.text)
1700 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1701 }
1702 #endif /* KSSL_DEBUG */
1703
1704 if (krb5rc)
1705 {
1706 ssl3_send_alert(s,SSL3_AL_FATAL,
1707 SSL_AD_HANDSHAKE_FAILURE);
1708 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1709 kssl_err.reason);
1710 goto err;
1711 }
1712
1713 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
1714 ** in place of RFC 2712 KerberosWrapper, as in:
1715 **
1716 ** Send ticket (copy to *p, set n = length)
1717 ** n = krb5_ap_req.length;
1718 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1719 ** if (krb5_ap_req.data)
1720 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1721 **
1722 ** Now using real RFC 2712 KerberosWrapper
1723 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1724 ** Note: 2712 "opaque" types are here replaced
1725 ** with a 2-byte length followed by the value.
1726 ** Example:
1727 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1728 ** Where "xx xx" = length bytes. Shown here with
1729 ** optional authenticator omitted.
1730 */
1731
1732 /* KerberosWrapper.Ticket */
1733 s2n(enc_ticket->length,p);
1734 memcpy(p, enc_ticket->data, enc_ticket->length);
1735 p+= enc_ticket->length;
1736 n = enc_ticket->length + 2;
1737
1738 /* KerberosWrapper.Authenticator */
1739 if (authp && authp->length)
1740 {
1741 s2n(authp->length,p);
1742 memcpy(p, authp->data, authp->length);
1743 p+= authp->length;
1744 n+= authp->length + 2;
1745
1746 free(authp->data);
1747 authp->data = NULL;
1748 authp->length = 0;
1749 }
1750 else
1751 {
1752 s2n(0,p);/* null authenticator length */
1753 n+=2;
1754 }
1755
1756 if (RAND_bytes(tmp_buf,SSL_MAX_MASTER_KEY_LENGTH) <= 0)
1757 goto err;
1758
1759 /* 20010420 VRS. Tried it this way; failed.
1760 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1761 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1762 ** kssl_ctx->length);
1763 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1764 */
1765
1766 memset(iv, 0, EVP_MAX_IV_LENGTH); /* per RFC 1510 */
1767 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1768 kssl_ctx->key,iv);
1769 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1770 SSL_MAX_MASTER_KEY_LENGTH);
1771 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1772 outl += padl;
1773 if (outl > sizeof epms)
1774 {
1775 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1776 goto err;
1777 }
1778 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1779
1780 /* KerberosWrapper.EncryptedPreMasterSecret */
1781 s2n(outl,p);
1782 memcpy(p, epms, outl);
1783 p+=outl;
1784 n+=outl + 2;
1785
1786 s->session->master_key_length=
1787 s->method->ssl3_enc->generate_master_secret(s,
1788 s->session->master_key,
1789 tmp_buf, SSL_MAX_MASTER_KEY_LENGTH);
1790
1791 memset(tmp_buf, 0, SSL_MAX_MASTER_KEY_LENGTH);
1792 memset(epms, 0, outl);
1793 }
1794 #endif
1795 #ifndef OPENSSL_NO_DH
1796 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1797 {
1798 DH *dh_srvr,*dh_clnt;
1799
1800 if (s->session->sess_cert->peer_dh_tmp != NULL)
1801 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1802 else
1803 {
1804 /* we get them from the cert */
1805 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1806 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1807 goto err;
1808 }
1809
1810 /* generate a new random key */
1811 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1812 {
1813 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1814 goto err;
1815 }
1816 if (!DH_generate_key(dh_clnt))
1817 {
1818 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1819 goto err;
1820 }
1821
1822 /* use the 'p' output buffer for the DH key, but
1823 * make sure to clear it out afterwards */
1824
1825 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1826
1827 if (n <= 0)
1828 {
1829 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1830 goto err;
1831 }
1832
1833 /* generate master key from the result */
1834 s->session->master_key_length=
1835 s->method->ssl3_enc->generate_master_secret(s,
1836 s->session->master_key,p,n);
1837 /* clean up */
1838 memset(p,0,n);
1839
1840 /* send off the data */
1841 n=BN_num_bytes(dh_clnt->pub_key);
1842 s2n(n,p);
1843 BN_bn2bin(dh_clnt->pub_key,p);
1844 n+=2;
1845
1846 DH_free(dh_clnt);
1847
1848 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1849 }
1850 #endif
1851
1852 #ifndef OPENSSL_NO_ECDH
1853 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1854 {
1855 EC_GROUP *srvr_group = NULL;
1856 int ecdh_clnt_cert = 0;
1857
1858 /* Did we send out the client's
1859 * ECDH share for use in premaster
1860 * computation as part of client certificate?
1861 * If so, set ecdh_clnt_cert to 1.
1862 */
1863 if ((l & SSL_kECDH) && (s->cert != NULL))
1864 {
1865 /* XXX: For now, we do not support client
1866 * authentication using ECDH certificates.
1867 * To add such support, one needs to add
1868 * code that checks for appropriate
1869 * conditions and sets ecdh_clnt_cert to 1.
1870 * For example, the cert have an ECC
1871 * key on the same curve as the server's
1872 * and the key should be authorized for
1873 * key agreement.
1874 *
1875 * One also needs to add code in ssl3_connect
1876 * to skip sending the certificate verify
1877 * message.
1878 *
1879 * if ((s->cert->key->privatekey != NULL) &&
1880 * (s->cert->key->privatekey->type ==
1881 * EVP_PKEY_EC) && ...)
1882 * ecdh_clnt_cert = 1;
1883 */
1884 }
1885
1886 if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1887 {
1888 srvr_group = s->session->sess_cert-> \
1889 peer_ecdh_tmp->group;
1890 srvr_ecpoint = s->session->sess_cert-> \
1891 peer_ecdh_tmp->pub_key;
1892 }
1893 else
1894 {
1895 /* Get the Server Public Key from Cert */
1896 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1897 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1898 if ((srvr_pub_pkey == NULL) ||
1899 (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1900 (srvr_pub_pkey->pkey.eckey == NULL))
1901 {
1902 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1903 ERR_R_INTERNAL_ERROR);
1904 goto err;
1905 }
1906
1907 srvr_group = srvr_pub_pkey->pkey.eckey->group;
1908 srvr_ecpoint =
1909 srvr_pub_pkey->pkey.eckey->pub_key;
1910 }
1911
1912 if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1913 {
1914 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1915 ERR_R_INTERNAL_ERROR);
1916 goto err;
1917 }
1918
1919 if ((clnt_ecdh=EC_KEY_new()) == NULL)
1920 {
1921 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1922 goto err;
1923 }
1924
1925 clnt_ecdh->group = srvr_group;
1926 if (ecdh_clnt_cert)
1927 {
1928 /* Reuse key info from our certificate
1929 * We only need our private key to perform
1930 * the ECDH computation.
1931 */
1932 clnt_ecdh->priv_key = BN_dup(s->cert->key-> \
1933 privatekey->pkey.eckey->priv_key);
1934 }
1935 else
1936 {
1937 /* Generate a new ECDH key pair */
1938 if (!(EC_KEY_generate_key(clnt_ecdh)))
1939 {
1940 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1941 goto err;
1942 }
1943 }
1944
1945 /* use the 'p' output buffer for the ECDH key, but
1946 * make sure to clear it out afterwards
1947 */
1948
1949 n=ECDH_compute_key(p, srvr_ecpoint, clnt_ecdh);
1950 if (n <= 0)
1951 {
1952 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1953 ERR_R_ECDH_LIB);
1954 goto err;
1955 }
1956
1957 /* generate master key from the result */
1958 s->session->master_key_length = s->method->ssl3_enc \
1959 -> generate_master_secret(s,
1960 s->session->master_key,
1961 p, n);
1962
1963 memset(p, 0, n); /* clean up */
1964
1965 if (ecdh_clnt_cert)
1966 {
1967 /* Send empty client key exch message */
1968 n = 0;
1969 }
1970 else
1971 {
1972 /* First check the size of encoding and
1973 * allocate memory accordingly.
1974 */
1975 encoded_pt_len =
1976 EC_POINT_point2oct(clnt_ecdh->group,
1977 clnt_ecdh->pub_key,
1978 POINT_CONVERSION_UNCOMPRESSED,
1979 NULL, 0, NULL);
1980
1981 encodedPoint = (unsigned char *)
1982 OPENSSL_malloc(encoded_pt_len *
1983 sizeof(unsigned char));
1984 bn_ctx = BN_CTX_new();
1985 if ((encodedPoint == NULL) ||
1986 (bn_ctx == NULL))
1987 {
1988 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1989 goto err;
1990 }
1991
1992 /* Encode the public key */
1993 n = EC_POINT_point2oct(clnt_ecdh->group,
1994 clnt_ecdh->pub_key,
1995 POINT_CONVERSION_UNCOMPRESSED,
1996 encodedPoint, encoded_pt_len, bn_ctx);
1997
1998 *p = n; /* length of encoded point */
1999 /* Encoded point will be copied here */
2000 p += 1;
2001 /* copy the point */
2002 memcpy((unsigned char *)p, encodedPoint, n);
2003 /* increment n to account for length field */
2004 n += 1;
2005 }
2006
2007 /* Free allocated memory */
2008 BN_CTX_free(bn_ctx);
2009 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2010 if (clnt_ecdh != NULL)
2011 {
2012 /* group is shared */
2013 clnt_ecdh->group = NULL;
2014 EC_KEY_free(clnt_ecdh);
2015 }
2016 EVP_PKEY_free(srvr_pub_pkey);
2017 }
2018 #endif /* !OPENSSL_NO_ECDH */
2019 else
2020 {
2021 ssl3_send_alert(s, SSL3_AL_FATAL,
2022 SSL_AD_HANDSHAKE_FAILURE);
2023 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2024 ERR_R_INTERNAL_ERROR);
2025 goto err;
2026 }
2027
2028 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2029 l2n3(n,d);
2030
2031 s->state=SSL3_ST_CW_KEY_EXCH_B;
2032 /* number of bytes to write */
2033 s->init_num=n+4;
2034 s->init_off=0;
2035 }
2036
2037 /* SSL3_ST_CW_KEY_EXCH_B */
2038 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2039 err:
2040 #ifndef OPENSSL_NO_ECDH
2041 BN_CTX_free(bn_ctx);
2042 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2043 if (clnt_ecdh != NULL)
2044 {
2045 /* group is shared */
2046 clnt_ecdh->group = NULL;
2047 EC_KEY_free(clnt_ecdh);
2048 }
2049 EVP_PKEY_free(srvr_pub_pkey);
2050 #endif
2051 return(-1);
2052 }
2053
2054 static int ssl3_send_client_verify(SSL *s)
2055 {
2056 unsigned char *p,*d;
2057 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2058 EVP_PKEY *pkey;
2059 #ifndef OPENSSL_NO_RSA
2060 unsigned u=0;
2061 #endif
2062 unsigned long n;
2063 #ifndef OPENSSL_NO_DSA
2064 int j;
2065 #endif
2066
2067 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2068 {
2069 d=(unsigned char *)s->init_buf->data;
2070 p= &(d[4]);
2071 pkey=s->cert->key->privatekey;
2072
2073 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2074 &(data[MD5_DIGEST_LENGTH]));
2075
2076 #ifndef OPENSSL_NO_RSA
2077 if (pkey->type == EVP_PKEY_RSA)
2078 {
2079 s->method->ssl3_enc->cert_verify_mac(s,
2080 &(s->s3->finish_dgst1),&(data[0]));
2081 if (RSA_sign(NID_md5_sha1, data,
2082 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2083 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2084 {
2085 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2086 goto err;
2087 }
2088 s2n(u,p);
2089 n=u+2;
2090 }
2091 else
2092 #endif
2093 #ifndef OPENSSL_NO_DSA
2094 if (pkey->type == EVP_PKEY_DSA)
2095 {
2096 if (!DSA_sign(pkey->save_type,
2097 &(data[MD5_DIGEST_LENGTH]),
2098 SHA_DIGEST_LENGTH,&(p[2]),
2099 (unsigned int *)&j,pkey->pkey.dsa))
2100 {
2101 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2102 goto err;
2103 }
2104 s2n(j,p);
2105 n=j+2;
2106 }
2107 else
2108 #endif
2109 #ifndef OPENSSL_NO_ECDSA
2110 if (pkey->type == EVP_PKEY_EC)
2111 {
2112 if (!ECDSA_sign(pkey->save_type,
2113 &(data[MD5_DIGEST_LENGTH]),
2114 SHA_DIGEST_LENGTH,&(p[2]),
2115 (unsigned int *)&j,pkey->pkey.eckey))
2116 {
2117 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2118 ERR_R_ECDSA_LIB);
2119 goto err;
2120 }
2121 s2n(j,p);
2122 n=j+2;
2123 }
2124 else
2125 #endif
2126 {
2127 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2128 goto err;
2129 }
2130 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2131 l2n3(n,d);
2132
2133 s->init_num=(int)n+4;
2134 s->init_off=0;
2135 }
2136 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2137 err:
2138 return(-1);
2139 }
2140
2141 static int ssl3_send_client_certificate(SSL *s)
2142 {
2143 X509 *x509=NULL;
2144 EVP_PKEY *pkey=NULL;
2145 int i;
2146 unsigned long l;
2147
2148 if (s->state == SSL3_ST_CW_CERT_A)
2149 {
2150 if ((s->cert == NULL) ||
2151 (s->cert->key->x509 == NULL) ||
2152 (s->cert->key->privatekey == NULL))
2153 s->state=SSL3_ST_CW_CERT_B;
2154 else
2155 s->state=SSL3_ST_CW_CERT_C;
2156 }
2157
2158 /* We need to get a client cert */
2159 if (s->state == SSL3_ST_CW_CERT_B)
2160 {
2161 /* If we get an error, we need to
2162 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2163 * We then get retied later */
2164 i=0;
2165 if (s->ctx->client_cert_cb != NULL)
2166 i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2167 if (i < 0)
2168 {
2169 s->rwstate=SSL_X509_LOOKUP;
2170 return(-1);
2171 }
2172 s->rwstate=SSL_NOTHING;
2173 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2174 {
2175 s->state=SSL3_ST_CW_CERT_B;
2176 if ( !SSL_use_certificate(s,x509) ||
2177 !SSL_use_PrivateKey(s,pkey))
2178 i=0;
2179 }
2180 else if (i == 1)
2181 {
2182 i=0;
2183 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2184 }
2185
2186 if (x509 != NULL) X509_free(x509);
2187 if (pkey != NULL) EVP_PKEY_free(pkey);
2188 if (i == 0)
2189 {
2190 if (s->version == SSL3_VERSION)
2191 {
2192 s->s3->tmp.cert_req=0;
2193 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2194 return(1);
2195 }
2196 else
2197 {
2198 s->s3->tmp.cert_req=2;
2199 }
2200 }
2201
2202 /* Ok, we have a cert */
2203 s->state=SSL3_ST_CW_CERT_C;
2204 }
2205
2206 if (s->state == SSL3_ST_CW_CERT_C)
2207 {
2208 s->state=SSL3_ST_CW_CERT_D;
2209 l=ssl3_output_cert_chain(s,
2210 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2211 s->init_num=(int)l;
2212 s->init_off=0;
2213 }
2214 /* SSL3_ST_CW_CERT_D */
2215 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2216 }
2217
2218 #define has_bits(i,m) (((i)&(m)) == (m))
2219
2220 static int ssl3_check_cert_and_algorithm(SSL *s)
2221 {
2222 int i,idx;
2223 long algs;
2224 EVP_PKEY *pkey=NULL;
2225 SESS_CERT *sc;
2226 #ifndef OPENSSL_NO_RSA
2227 RSA *rsa;
2228 #endif
2229 #ifndef OPENSSL_NO_DH
2230 DH *dh;
2231 #endif
2232
2233 sc=s->session->sess_cert;
2234
2235 if (sc == NULL)
2236 {
2237 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2238 goto err;
2239 }
2240
2241 algs=s->s3->tmp.new_cipher->algorithms;
2242
2243 /* we don't have a certificate */
2244 if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2245 return(1);
2246
2247 #ifndef OPENSSL_NO_RSA
2248 rsa=s->session->sess_cert->peer_rsa_tmp;
2249 #endif
2250 #ifndef OPENSSL_NO_DH
2251 dh=s->session->sess_cert->peer_dh_tmp;
2252 #endif
2253
2254 /* This is the passed certificate */
2255
2256 idx=sc->peer_cert_type;
2257 #ifndef OPENSSL_NO_ECDH
2258 if (idx == SSL_PKEY_ECC)
2259 {
2260 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2261 s->s3->tmp.new_cipher) == 0)
2262 { /* check failed */
2263 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2264 goto f_err;
2265 }
2266 else
2267 {
2268 return 1;
2269 }
2270 }
2271 #endif
2272 pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2273 i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2274 EVP_PKEY_free(pkey);
2275
2276
2277 /* Check that we have a certificate if we require one */
2278 if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2279 {
2280 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2281 goto f_err;
2282 }
2283 #ifndef OPENSSL_NO_DSA
2284 else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2285 {
2286 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2287 goto f_err;
2288 }
2289 #endif
2290 #ifndef OPENSSL_NO_RSA
2291 if ((algs & SSL_kRSA) &&
2292 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2293 {
2294 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2295 goto f_err;
2296 }
2297 #endif
2298 #ifndef OPENSSL_NO_DH
2299 if ((algs & SSL_kEDH) &&
2300 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2301 {
2302 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2303 goto f_err;
2304 }
2305 else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2306 {
2307 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2308 goto f_err;
2309 }
2310 #ifndef OPENSSL_NO_DSA
2311 else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2312 {
2313 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2314 goto f_err;
2315 }
2316 #endif
2317 #endif
2318
2319 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2320 {
2321 #ifndef OPENSSL_NO_RSA
2322 if (algs & SSL_kRSA)
2323 {
2324 if (rsa == NULL
2325 || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2326 {
2327 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2328 goto f_err;
2329 }
2330 }
2331 else
2332 #endif
2333 #ifndef OPENSSL_NO_DH
2334 if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2335 {
2336 if (dh == NULL
2337 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2338 {
2339 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2340 goto f_err;
2341 }
2342 }
2343 else
2344 #endif
2345 {
2346 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2347 goto f_err;
2348 }
2349 }
2350 return(1);
2351 f_err:
2352 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2353 err:
2354 return(0);
2355 }
2356
2357
2358 #ifndef OPENSSL_NO_ECDH
2359 /* This is the complement of nid2curve_id in s3_srvr.c. */
2360 static int curve_id2nid(int curve_id)
2361 {
2362 /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001) */
2363 static int nid_list[26] =
2364 {
2365 0,
2366 NID_sect163k1, /* sect163k1 (1) */
2367 NID_sect163r1, /* sect163r1 (2) */
2368 NID_sect163r2, /* sect163r2 (3) */
2369 NID_sect193r1, /* sect193r1 (4) */
2370 NID_sect193r2, /* sect193r2 (5) */
2371 NID_sect233k1, /* sect233k1 (6) */
2372 NID_sect233r1, /* sect233r1 (7) */
2373 NID_sect239k1, /* sect239k1 (8) */
2374 NID_sect283k1, /* sect283k1 (9) */
2375 NID_sect283r1, /* sect283r1 (10) */
2376 NID_sect409k1, /* sect409k1 (11) */
2377 NID_sect409r1, /* sect409r1 (12) */
2378 NID_sect571k1, /* sect571k1 (13) */
2379 NID_sect571r1, /* sect571r1 (14) */
2380 NID_secp160k1, /* secp160k1 (15) */
2381 NID_secp160r1, /* secp160r1 (16) */
2382 NID_secp160r2, /* secp160r2 (17) */
2383 NID_secp192k1, /* secp192k1 (18) */
2384 NID_X9_62_prime192v1, /* secp192r1 (19) */
2385 NID_secp224k1, /* secp224k1 (20) */
2386 NID_secp224r1, /* secp224r1 (21) */
2387 NID_secp256k1, /* secp256k1 (22) */
2388 NID_X9_62_prime256v1, /* secp256r1 (23) */
2389 NID_secp384r1, /* secp384r1 (24) */
2390 NID_secp521r1 /* secp521r1 (25) */
2391 };
2392
2393 if ((curve_id < 1) || (curve_id > 25)) return 0;
2394
2395 return nid_list[curve_id];
2396 }
2397 #endif
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