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ECC ciphersuite support
[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 init=0;
182 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
183 sizeof(SSL_METHOD));
184 SSLv3_client_data.ssl_connect=ssl3_connect;
185 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
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)
675 {
676 al=SSL_AD_ILLEGAL_PARAMETER;
677 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
678 SSL_R_SSL3_SESSION_ID_TOO_LONG);
679 goto f_err;
680 }
681
682 if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
683 {
684 /* SSLref returns 16 :-( */
685 if (j < SSL2_SSL_SESSION_ID_LENGTH)
686 {
687 al=SSL_AD_ILLEGAL_PARAMETER;
688 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
689 goto f_err;
690 }
691 }
692 if (j != 0 && j == s->session->session_id_length
693 && memcmp(p,s->session->session_id,j) == 0)
694 {
695 if(s->sid_ctx_length != s->session->sid_ctx_length
696 || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
697 {
698 al=SSL_AD_ILLEGAL_PARAMETER;
699 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
700 goto f_err;
701 }
702 s->hit=1;
703 }
704 else /* a miss or crap from the other end */
705 {
706 /* If we were trying for session-id reuse, make a new
707 * SSL_SESSION so we don't stuff up other people */
708 s->hit=0;
709 if (s->session->session_id_length > 0)
710 {
711 if (!ssl_get_new_session(s,0))
712 {
713 al=SSL_AD_INTERNAL_ERROR;
714 goto f_err;
715 }
716 }
717 s->session->session_id_length=j;
718 memcpy(s->session->session_id,p,j); /* j could be 0 */
719 }
720 p+=j;
721 c=ssl_get_cipher_by_char(s,p);
722 if (c == NULL)
723 {
724 /* unknown cipher */
725 al=SSL_AD_ILLEGAL_PARAMETER;
726 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
727 goto f_err;
728 }
729 p+=ssl_put_cipher_by_char(s,NULL,NULL);
730
731 sk=ssl_get_ciphers_by_id(s);
732 i=sk_SSL_CIPHER_find(sk,c);
733 if (i < 0)
734 {
735 /* we did not say we would use this cipher */
736 al=SSL_AD_ILLEGAL_PARAMETER;
737 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
738 goto f_err;
739 }
740
741 if (s->hit && (s->session->cipher != c))
742 {
743 if (!(s->options &
744 SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
745 {
746 al=SSL_AD_ILLEGAL_PARAMETER;
747 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
748 goto f_err;
749 }
750 }
751 s->s3->tmp.new_cipher=c;
752
753 /* lets get the compression algorithm */
754 /* COMPRESSION */
755 j= *(p++);
756 if (j == 0)
757 comp=NULL;
758 else
759 comp=ssl3_comp_find(s->ctx->comp_methods,j);
760
761 if ((j != 0) && (comp == NULL))
762 {
763 al=SSL_AD_ILLEGAL_PARAMETER;
764 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
765 goto f_err;
766 }
767 else
768 {
769 s->s3->tmp.new_compression=comp;
770 }
771
772 if (p != (d+n))
773 {
774 /* wrong packet length */
775 al=SSL_AD_DECODE_ERROR;
776 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
777 goto err;
778 }
779
780 return(1);
781 f_err:
782 ssl3_send_alert(s,SSL3_AL_FATAL,al);
783 err:
784 return(-1);
785 }
786
787 static int ssl3_get_server_certificate(SSL *s)
788 {
789 int al,i,ok,ret= -1;
790 unsigned long n,nc,llen,l;
791 X509 *x=NULL;
792 unsigned char *p,*d,*q;
793 STACK_OF(X509) *sk=NULL;
794 SESS_CERT *sc;
795 EVP_PKEY *pkey=NULL;
796 int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
797
798 n=ssl3_get_message(s,
799 SSL3_ST_CR_CERT_A,
800 SSL3_ST_CR_CERT_B,
801 -1,
802 s->max_cert_list,
803 &ok);
804
805 if (!ok) return((int)n);
806
807 if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
808 {
809 s->s3->tmp.reuse_message=1;
810 return(1);
811 }
812
813 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
814 {
815 al=SSL_AD_UNEXPECTED_MESSAGE;
816 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
817 goto f_err;
818 }
819 d=p=(unsigned char *)s->init_msg;
820
821 if ((sk=sk_X509_new_null()) == NULL)
822 {
823 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
824 goto err;
825 }
826
827 n2l3(p,llen);
828 if (llen+3 != n)
829 {
830 al=SSL_AD_DECODE_ERROR;
831 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
832 goto f_err;
833 }
834 for (nc=0; nc<llen; )
835 {
836 n2l3(p,l);
837 if ((l+nc+3) > llen)
838 {
839 al=SSL_AD_DECODE_ERROR;
840 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
841 goto f_err;
842 }
843
844 q=p;
845 x=d2i_X509(NULL,&q,l);
846 if (x == NULL)
847 {
848 al=SSL_AD_BAD_CERTIFICATE;
849 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
850 goto f_err;
851 }
852 if (q != (p+l))
853 {
854 al=SSL_AD_DECODE_ERROR;
855 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
856 goto f_err;
857 }
858 if (!sk_X509_push(sk,x))
859 {
860 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
861 goto err;
862 }
863 x=NULL;
864 nc+=l+3;
865 p=q;
866 }
867
868 i=ssl_verify_cert_chain(s,sk);
869 if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
870 #ifndef OPENSSL_NO_KRB5
871 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
872 != (SSL_aKRB5|SSL_kKRB5)
873 #endif /* OPENSSL_NO_KRB5 */
874 )
875 {
876 al=ssl_verify_alarm_type(s->verify_result);
877 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
878 goto f_err;
879 }
880 ERR_clear_error(); /* but we keep s->verify_result */
881
882 sc=ssl_sess_cert_new();
883 if (sc == NULL) goto err;
884
885 if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
886 s->session->sess_cert=sc;
887
888 sc->cert_chain=sk;
889 /* Inconsistency alert: cert_chain does include the peer's
890 * certificate, which we don't include in s3_srvr.c */
891 x=sk_X509_value(sk,0);
892 sk=NULL;
893 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
894
895 pkey=X509_get_pubkey(x);
896
897 /* VRS: allow null cert if auth == KRB5 */
898 need_cert = ((s->s3->tmp.new_cipher->algorithms
899 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
900 == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
901
902 #ifdef KSSL_DEBUG
903 printf("pkey,x = %p, %p\n", pkey,x);
904 printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
905 printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
906 s->s3->tmp.new_cipher->algorithms, need_cert);
907 #endif /* KSSL_DEBUG */
908
909 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
910 {
911 x=NULL;
912 al=SSL3_AL_FATAL;
913 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
914 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
915 goto f_err;
916 }
917
918 i=ssl_cert_type(x,pkey);
919 if (need_cert && i < 0)
920 {
921 x=NULL;
922 al=SSL3_AL_FATAL;
923 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
924 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
925 goto f_err;
926 }
927
928 if (need_cert)
929 {
930 sc->peer_cert_type=i;
931 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
932 /* Why would the following ever happen?
933 * We just created sc a couple of lines ago. */
934 if (sc->peer_pkeys[i].x509 != NULL)
935 X509_free(sc->peer_pkeys[i].x509);
936 sc->peer_pkeys[i].x509=x;
937 sc->peer_key= &(sc->peer_pkeys[i]);
938
939 if (s->session->peer != NULL)
940 X509_free(s->session->peer);
941 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
942 s->session->peer=x;
943 }
944 else
945 {
946 sc->peer_cert_type=i;
947 sc->peer_key= NULL;
948
949 if (s->session->peer != NULL)
950 X509_free(s->session->peer);
951 s->session->peer=NULL;
952 }
953 s->session->verify_result = s->verify_result;
954
955 x=NULL;
956 ret=1;
957
958 if (0)
959 {
960 f_err:
961 ssl3_send_alert(s,SSL3_AL_FATAL,al);
962 }
963 err:
964 EVP_PKEY_free(pkey);
965 X509_free(x);
966 sk_X509_pop_free(sk,X509_free);
967 return(ret);
968 }
969
970 static int ssl3_get_key_exchange(SSL *s)
971 {
972 #ifndef OPENSSL_NO_RSA
973 unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
974 #endif
975 EVP_MD_CTX md_ctx;
976 unsigned char *param,*p;
977 int al,i,j,param_len,ok;
978 long n,alg;
979 EVP_PKEY *pkey=NULL;
980 #ifndef OPENSSL_NO_RSA
981 RSA *rsa=NULL;
982 #endif
983 #ifndef OPENSSL_NO_DH
984 DH *dh=NULL;
985 #endif
986 #ifndef OPENSSL_NO_ECDH
987 EC_KEY *ecdh = NULL;
988 BN_CTX *bn_ctx = NULL;
989 EC_POINT *srvr_ecpoint = NULL;
990 int curve_nid = 0;
991 int encoded_pt_len = 0;
992 #endif
993
994 /* use same message size as in ssl3_get_certificate_request()
995 * as ServerKeyExchange message may be skipped */
996 n=ssl3_get_message(s,
997 SSL3_ST_CR_KEY_EXCH_A,
998 SSL3_ST_CR_KEY_EXCH_B,
999 -1,
1000 s->max_cert_list,
1001 &ok);
1002
1003 if (!ok) return((int)n);
1004
1005 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1006 {
1007 s->s3->tmp.reuse_message=1;
1008 return(1);
1009 }
1010
1011 param=p=(unsigned char *)s->init_msg;
1012
1013 if (s->session->sess_cert != NULL)
1014 {
1015 #ifndef OPENSSL_NO_RSA
1016 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1017 {
1018 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1019 s->session->sess_cert->peer_rsa_tmp=NULL;
1020 }
1021 #endif
1022 #ifndef OPENSSL_NO_DH
1023 if (s->session->sess_cert->peer_dh_tmp)
1024 {
1025 DH_free(s->session->sess_cert->peer_dh_tmp);
1026 s->session->sess_cert->peer_dh_tmp=NULL;
1027 }
1028 #endif
1029 #ifndef OPENSSL_NO_ECDH
1030 if (s->session->sess_cert->peer_ecdh_tmp)
1031 {
1032 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1033 s->session->sess_cert->peer_ecdh_tmp=NULL;
1034 }
1035 #endif
1036 }
1037 else
1038 {
1039 s->session->sess_cert=ssl_sess_cert_new();
1040 }
1041
1042 param_len=0;
1043 alg=s->s3->tmp.new_cipher->algorithms;
1044 EVP_MD_CTX_init(&md_ctx);
1045
1046 #ifndef OPENSSL_NO_RSA
1047 if (alg & SSL_kRSA)
1048 {
1049 if ((rsa=RSA_new()) == NULL)
1050 {
1051 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1052 goto err;
1053 }
1054 n2s(p,i);
1055 param_len=i+2;
1056 if (param_len > n)
1057 {
1058 al=SSL_AD_DECODE_ERROR;
1059 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1060 goto f_err;
1061 }
1062 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1063 {
1064 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1065 goto err;
1066 }
1067 p+=i;
1068
1069 n2s(p,i);
1070 param_len+=i+2;
1071 if (param_len > n)
1072 {
1073 al=SSL_AD_DECODE_ERROR;
1074 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1075 goto f_err;
1076 }
1077 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1078 {
1079 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1080 goto err;
1081 }
1082 p+=i;
1083 n-=param_len;
1084
1085 /* this should be because we are using an export cipher */
1086 if (alg & SSL_aRSA)
1087 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1088 else
1089 {
1090 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1091 goto err;
1092 }
1093 s->session->sess_cert->peer_rsa_tmp=rsa;
1094 rsa=NULL;
1095 }
1096 #else /* OPENSSL_NO_RSA */
1097 if (0)
1098 ;
1099 #endif
1100 #ifndef OPENSSL_NO_DH
1101 else if (alg & SSL_kEDH)
1102 {
1103 if ((dh=DH_new()) == NULL)
1104 {
1105 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1106 goto err;
1107 }
1108 n2s(p,i);
1109 param_len=i+2;
1110 if (param_len > n)
1111 {
1112 al=SSL_AD_DECODE_ERROR;
1113 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1114 goto f_err;
1115 }
1116 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1117 {
1118 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1119 goto err;
1120 }
1121 p+=i;
1122
1123 n2s(p,i);
1124 param_len+=i+2;
1125 if (param_len > n)
1126 {
1127 al=SSL_AD_DECODE_ERROR;
1128 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1129 goto f_err;
1130 }
1131 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1132 {
1133 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1134 goto err;
1135 }
1136 p+=i;
1137
1138 n2s(p,i);
1139 param_len+=i+2;
1140 if (param_len > n)
1141 {
1142 al=SSL_AD_DECODE_ERROR;
1143 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1144 goto f_err;
1145 }
1146 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1147 {
1148 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1149 goto err;
1150 }
1151 p+=i;
1152 n-=param_len;
1153
1154 #ifndef OPENSSL_NO_RSA
1155 if (alg & SSL_aRSA)
1156 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1157 #else
1158 if (0)
1159 ;
1160 #endif
1161 #ifndef OPENSSL_NO_DSA
1162 else if (alg & SSL_aDSS)
1163 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1164 #endif
1165 /* else anonymous DH, so no certificate or pkey. */
1166
1167 s->session->sess_cert->peer_dh_tmp=dh;
1168 dh=NULL;
1169 }
1170 else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1171 {
1172 al=SSL_AD_ILLEGAL_PARAMETER;
1173 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1174 goto f_err;
1175 }
1176 #endif /* !OPENSSL_NO_DH */
1177
1178 #ifndef OPENSSL_NO_ECDH
1179 else if (alg & SSL_kECDHE)
1180 {
1181 if ((ecdh=EC_KEY_new()) == NULL)
1182 {
1183 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1184 goto err;
1185 }
1186
1187 /* Extract elliptic curve parameters and the
1188 * server's ephemeral ECDH public key.
1189 * Keep accumulating lengths of various components in
1190 * param_len and make sure it never exceeds n.
1191 */
1192
1193 /* XXX: For now we only support named (not generic) curves
1194 * and the ECParameters in this case is just two bytes.
1195 */
1196 param_len=2;
1197 if ((param_len > n) ||
1198 (*p != NAMED_CURVE_TYPE) ||
1199 ((curve_nid = curve_id2nid(*(p + 1))) == 0))
1200 {
1201 al=SSL_AD_INTERNAL_ERROR;
1202 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1203 goto f_err;
1204 }
1205
1206 if (!(ecdh->group=EC_GROUP_new_by_nid(curve_nid)))
1207 {
1208 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1209 goto err;
1210 }
1211
1212 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1213 (EC_GROUP_get_degree(ecdh->group) > 163))
1214 {
1215 al=SSL_AD_EXPORT_RESTRICTION;
1216 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1217 goto f_err;
1218 }
1219
1220 p+=2;
1221
1222 /* Next, get the encoded ECPoint */
1223 if (((srvr_ecpoint = EC_POINT_new(ecdh->group)) == NULL) ||
1224 ((bn_ctx = BN_CTX_new()) == NULL))
1225 {
1226 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1227 goto err;
1228 }
1229
1230 encoded_pt_len = *p; /* length of encoded point */
1231 p+=1;
1232 param_len += (1 + encoded_pt_len);
1233 if ((param_len > n) ||
1234 (EC_POINT_oct2point(ecdh->group, srvr_ecpoint,
1235 p, encoded_pt_len, bn_ctx) == 0))
1236 {
1237 al=SSL_AD_DECODE_ERROR;
1238 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1239 goto f_err;
1240 }
1241
1242 n-=param_len;
1243 p+=encoded_pt_len;
1244
1245 /* The ECC/TLS specification does not mention
1246 * the use of DSA to sign ECParameters in the server
1247 * key exchange message. We do support RSA and ECDSA.
1248 */
1249 if (0) ;
1250 #ifndef OPENSSL_NO_RSA
1251 else if (alg & SSL_aRSA)
1252 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1253 #endif
1254 #ifndef OPENSSL_NO_ECDSA
1255 else if (alg & SSL_aECDSA)
1256 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1257 #endif
1258 /* else anonymous ECDH, so no certificate or pkey. */
1259 ecdh->pub_key = srvr_ecpoint;
1260 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1261 ecdh=NULL;
1262 BN_CTX_free(bn_ctx);
1263 srvr_ecpoint = NULL;
1264 }
1265 else if (alg & SSL_kECDH)
1266 {
1267 al=SSL_AD_UNEXPECTED_MESSAGE;
1268 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1269 goto f_err;
1270 }
1271 #endif /* !OPENSSL_NO_ECDH */
1272 if (alg & SSL_aFZA)
1273 {
1274 al=SSL_AD_HANDSHAKE_FAILURE;
1275 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1276 goto f_err;
1277 }
1278
1279
1280 /* p points to the next byte, there are 'n' bytes left */
1281
1282 /* if it was signed, check the signature */
1283 if (pkey != NULL)
1284 {
1285 n2s(p,i);
1286 n-=2;
1287 j=EVP_PKEY_size(pkey);
1288
1289 if ((i != n) || (n > j) || (n <= 0))
1290 {
1291 /* wrong packet length */
1292 al=SSL_AD_DECODE_ERROR;
1293 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1294 goto f_err;
1295 }
1296
1297 #ifndef OPENSSL_NO_RSA
1298 if (pkey->type == EVP_PKEY_RSA)
1299 {
1300 int num;
1301
1302 j=0;
1303 q=md_buf;
1304 for (num=2; num > 0; num--)
1305 {
1306 EVP_DigestInit_ex(&md_ctx,(num == 2)
1307 ?s->ctx->md5:s->ctx->sha1, NULL);
1308 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1309 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1310 EVP_DigestUpdate(&md_ctx,param,param_len);
1311 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1312 q+=i;
1313 j+=i;
1314 }
1315 i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1316 pkey->pkey.rsa);
1317 if (i < 0)
1318 {
1319 al=SSL_AD_DECRYPT_ERROR;
1320 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1321 goto f_err;
1322 }
1323 if (i == 0)
1324 {
1325 /* bad signature */
1326 al=SSL_AD_DECRYPT_ERROR;
1327 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1328 goto f_err;
1329 }
1330 }
1331 else
1332 #endif
1333 #ifndef OPENSSL_NO_DSA
1334 if (pkey->type == EVP_PKEY_DSA)
1335 {
1336 /* lets do DSS */
1337 EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1338 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1339 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1340 EVP_VerifyUpdate(&md_ctx,param,param_len);
1341 if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1342 {
1343 /* bad signature */
1344 al=SSL_AD_DECRYPT_ERROR;
1345 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1346 goto f_err;
1347 }
1348 }
1349 else
1350 #endif
1351 #ifndef OPENSSL_NO_ECDSA
1352 if (pkey->type == EVP_PKEY_ECDSA)
1353 {
1354 /* let's do ECDSA */
1355 EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1356 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1357 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1358 EVP_VerifyUpdate(&md_ctx,param,param_len);
1359 if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1360 {
1361 /* bad signature */
1362 al=SSL_AD_DECRYPT_ERROR;
1363 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1364 goto f_err;
1365 }
1366 }
1367 else
1368 #endif
1369 {
1370 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1371 goto err;
1372 }
1373 }
1374 else
1375 {
1376 /* still data left over */
1377 if (!(alg & SSL_aNULL))
1378 {
1379 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1380 goto err;
1381 }
1382 if (n != 0)
1383 {
1384 al=SSL_AD_DECODE_ERROR;
1385 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1386 goto f_err;
1387 }
1388 }
1389 EVP_PKEY_free(pkey);
1390 EVP_MD_CTX_cleanup(&md_ctx);
1391 return(1);
1392 f_err:
1393 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1394 err:
1395 EVP_PKEY_free(pkey);
1396 #ifndef OPENSSL_NO_RSA
1397 if (rsa != NULL)
1398 RSA_free(rsa);
1399 #endif
1400 #ifndef OPENSSL_NO_DH
1401 if (dh != NULL)
1402 DH_free(dh);
1403 #endif
1404 #ifndef OPENSSL_NO_ECDH
1405 BN_CTX_free(bn_ctx);
1406 EC_POINT_free(srvr_ecpoint);
1407 if (ecdh != NULL)
1408 EC_KEY_free(ecdh);
1409 #endif
1410 EVP_MD_CTX_cleanup(&md_ctx);
1411 return(-1);
1412 }
1413
1414 static int ssl3_get_certificate_request(SSL *s)
1415 {
1416 int ok,ret=0;
1417 unsigned long n,nc,l;
1418 unsigned int llen,ctype_num,i;
1419 X509_NAME *xn=NULL;
1420 unsigned char *p,*d,*q;
1421 STACK_OF(X509_NAME) *ca_sk=NULL;
1422
1423 n=ssl3_get_message(s,
1424 SSL3_ST_CR_CERT_REQ_A,
1425 SSL3_ST_CR_CERT_REQ_B,
1426 -1,
1427 s->max_cert_list,
1428 &ok);
1429
1430 if (!ok) return((int)n);
1431
1432 s->s3->tmp.cert_req=0;
1433
1434 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1435 {
1436 s->s3->tmp.reuse_message=1;
1437 return(1);
1438 }
1439
1440 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1441 {
1442 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1443 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1444 goto err;
1445 }
1446
1447 /* TLS does not like anon-DH with client cert */
1448 if (s->version > SSL3_VERSION)
1449 {
1450 l=s->s3->tmp.new_cipher->algorithms;
1451 if (l & SSL_aNULL)
1452 {
1453 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1454 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1455 goto err;
1456 }
1457 }
1458
1459 d=p=(unsigned char *)s->init_msg;
1460
1461 if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1462 {
1463 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1464 goto err;
1465 }
1466
1467 /* get the certificate types */
1468 ctype_num= *(p++);
1469 if (ctype_num > SSL3_CT_NUMBER)
1470 ctype_num=SSL3_CT_NUMBER;
1471 for (i=0; i<ctype_num; i++)
1472 s->s3->tmp.ctype[i]= p[i];
1473 p+=ctype_num;
1474
1475 /* get the CA RDNs */
1476 n2s(p,llen);
1477 #if 0
1478 {
1479 FILE *out;
1480 out=fopen("/tmp/vsign.der","w");
1481 fwrite(p,1,llen,out);
1482 fclose(out);
1483 }
1484 #endif
1485
1486 if ((llen+ctype_num+2+1) != n)
1487 {
1488 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1489 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1490 goto err;
1491 }
1492
1493 for (nc=0; nc<llen; )
1494 {
1495 n2s(p,l);
1496 if ((l+nc+2) > llen)
1497 {
1498 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1499 goto cont; /* netscape bugs */
1500 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1501 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1502 goto err;
1503 }
1504
1505 q=p;
1506
1507 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1508 {
1509 /* If netscape tolerance is on, ignore errors */
1510 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1511 goto cont;
1512 else
1513 {
1514 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1515 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1516 goto err;
1517 }
1518 }
1519
1520 if (q != (p+l))
1521 {
1522 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1523 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1524 goto err;
1525 }
1526 if (!sk_X509_NAME_push(ca_sk,xn))
1527 {
1528 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1529 goto err;
1530 }
1531
1532 p+=l;
1533 nc+=l+2;
1534 }
1535
1536 if (0)
1537 {
1538 cont:
1539 ERR_clear_error();
1540 }
1541
1542 /* we should setup a certificate to return.... */
1543 s->s3->tmp.cert_req=1;
1544 s->s3->tmp.ctype_num=ctype_num;
1545 if (s->s3->tmp.ca_names != NULL)
1546 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1547 s->s3->tmp.ca_names=ca_sk;
1548 ca_sk=NULL;
1549
1550 ret=1;
1551 err:
1552 if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1553 return(ret);
1554 }
1555
1556 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1557 {
1558 return(X509_NAME_cmp(*a,*b));
1559 }
1560
1561 static int ssl3_get_server_done(SSL *s)
1562 {
1563 int ok,ret=0;
1564 long n;
1565
1566 n=ssl3_get_message(s,
1567 SSL3_ST_CR_SRVR_DONE_A,
1568 SSL3_ST_CR_SRVR_DONE_B,
1569 SSL3_MT_SERVER_DONE,
1570 30, /* should be very small, like 0 :-) */
1571 &ok);
1572
1573 if (!ok) return((int)n);
1574 if (n > 0)
1575 {
1576 /* should contain no data */
1577 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1578 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1579 return -1;
1580 }
1581 ret=1;
1582 return(ret);
1583 }
1584
1585 static int ssl3_send_client_key_exchange(SSL *s)
1586 {
1587 unsigned char *p,*d;
1588 int n;
1589 unsigned long l;
1590 #ifndef OPENSSL_NO_RSA
1591 unsigned char *q;
1592 EVP_PKEY *pkey=NULL;
1593 #endif
1594 #ifndef OPENSSL_NO_KRB5
1595 KSSL_ERR kssl_err;
1596 #endif /* OPENSSL_NO_KRB5 */
1597 #ifndef OPENSSL_NO_ECDH
1598 EC_KEY *clnt_ecdh = NULL;
1599 EC_POINT *srvr_ecpoint = NULL;
1600 EVP_PKEY *srvr_pub_pkey = NULL;
1601 unsigned char *encodedPoint = NULL;
1602 int encoded_pt_len = 0;
1603 BN_CTX * bn_ctx = NULL;
1604 #endif
1605
1606 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1607 {
1608 d=(unsigned char *)s->init_buf->data;
1609 p= &(d[4]);
1610
1611 l=s->s3->tmp.new_cipher->algorithms;
1612
1613 /* Fool emacs indentation */
1614 if (0) {}
1615 #ifndef OPENSSL_NO_RSA
1616 else if (l & SSL_kRSA)
1617 {
1618 RSA *rsa;
1619 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1620
1621 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1622 rsa=s->session->sess_cert->peer_rsa_tmp;
1623 else
1624 {
1625 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1626 if ((pkey == NULL) ||
1627 (pkey->type != EVP_PKEY_RSA) ||
1628 (pkey->pkey.rsa == NULL))
1629 {
1630 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1631 goto err;
1632 }
1633 rsa=pkey->pkey.rsa;
1634 EVP_PKEY_free(pkey);
1635 }
1636
1637 tmp_buf[0]=s->client_version>>8;
1638 tmp_buf[1]=s->client_version&0xff;
1639 if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1640 goto err;
1641
1642 s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1643
1644 q=p;
1645 /* Fix buf for TLS and beyond */
1646 if (s->version > SSL3_VERSION)
1647 p+=2;
1648 n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1649 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1650 #ifdef PKCS1_CHECK
1651 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1652 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1653 #endif
1654 if (n <= 0)
1655 {
1656 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1657 goto err;
1658 }
1659
1660 /* Fix buf for TLS and beyond */
1661 if (s->version > SSL3_VERSION)
1662 {
1663 s2n(n,q);
1664 n+=2;
1665 }
1666
1667 s->session->master_key_length=
1668 s->method->ssl3_enc->generate_master_secret(s,
1669 s->session->master_key,
1670 tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1671 memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1672 }
1673 #endif
1674 #ifndef OPENSSL_NO_KRB5
1675 else if (l & SSL_kKRB5)
1676 {
1677 krb5_error_code krb5rc;
1678 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1679 /* krb5_data krb5_ap_req; */
1680 krb5_data *enc_ticket;
1681 krb5_data authenticator, *authp = NULL;
1682 EVP_CIPHER_CTX ciph_ctx;
1683 EVP_CIPHER *enc = NULL;
1684 unsigned char iv[EVP_MAX_IV_LENGTH];
1685 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1686 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
1687 + EVP_MAX_IV_LENGTH];
1688 int padl, outl = sizeof(epms);
1689
1690 EVP_CIPHER_CTX_init(&ciph_ctx);
1691
1692 #ifdef KSSL_DEBUG
1693 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1694 l, SSL_kKRB5);
1695 #endif /* KSSL_DEBUG */
1696
1697 authp = NULL;
1698 #ifdef KRB5SENDAUTH
1699 if (KRB5SENDAUTH) authp = &authenticator;
1700 #endif /* KRB5SENDAUTH */
1701
1702 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1703 &kssl_err);
1704 enc = kssl_map_enc(kssl_ctx->enctype);
1705 if (enc == NULL)
1706 goto err;
1707 #ifdef KSSL_DEBUG
1708 {
1709 printf("kssl_cget_tkt rtn %d\n", krb5rc);
1710 if (krb5rc && kssl_err.text)
1711 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1712 }
1713 #endif /* KSSL_DEBUG */
1714
1715 if (krb5rc)
1716 {
1717 ssl3_send_alert(s,SSL3_AL_FATAL,
1718 SSL_AD_HANDSHAKE_FAILURE);
1719 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1720 kssl_err.reason);
1721 goto err;
1722 }
1723
1724 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
1725 ** in place of RFC 2712 KerberosWrapper, as in:
1726 **
1727 ** Send ticket (copy to *p, set n = length)
1728 ** n = krb5_ap_req.length;
1729 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1730 ** if (krb5_ap_req.data)
1731 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1732 **
1733 ** Now using real RFC 2712 KerberosWrapper
1734 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1735 ** Note: 2712 "opaque" types are here replaced
1736 ** with a 2-byte length followed by the value.
1737 ** Example:
1738 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1739 ** Where "xx xx" = length bytes. Shown here with
1740 ** optional authenticator omitted.
1741 */
1742
1743 /* KerberosWrapper.Ticket */
1744 s2n(enc_ticket->length,p);
1745 memcpy(p, enc_ticket->data, enc_ticket->length);
1746 p+= enc_ticket->length;
1747 n = enc_ticket->length + 2;
1748
1749 /* KerberosWrapper.Authenticator */
1750 if (authp && authp->length)
1751 {
1752 s2n(authp->length,p);
1753 memcpy(p, authp->data, authp->length);
1754 p+= authp->length;
1755 n+= authp->length + 2;
1756
1757 free(authp->data);
1758 authp->data = NULL;
1759 authp->length = 0;
1760 }
1761 else
1762 {
1763 s2n(0,p);/* null authenticator length */
1764 n+=2;
1765 }
1766
1767 if (RAND_bytes(tmp_buf,SSL_MAX_MASTER_KEY_LENGTH) <= 0)
1768 goto err;
1769
1770 /* 20010420 VRS. Tried it this way; failed.
1771 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1772 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1773 ** kssl_ctx->length);
1774 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1775 */
1776
1777 memset(iv, 0, EVP_MAX_IV_LENGTH); /* per RFC 1510 */
1778 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1779 kssl_ctx->key,iv);
1780 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1781 SSL_MAX_MASTER_KEY_LENGTH);
1782 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1783 outl += padl;
1784 if (outl > sizeof epms)
1785 {
1786 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1787 goto err;
1788 }
1789 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1790
1791 /* KerberosWrapper.EncryptedPreMasterSecret */
1792 s2n(outl,p);
1793 memcpy(p, epms, outl);
1794 p+=outl;
1795 n+=outl + 2;
1796
1797 s->session->master_key_length=
1798 s->method->ssl3_enc->generate_master_secret(s,
1799 s->session->master_key,
1800 tmp_buf, SSL_MAX_MASTER_KEY_LENGTH);
1801
1802 memset(tmp_buf, 0, SSL_MAX_MASTER_KEY_LENGTH);
1803 memset(epms, 0, outl);
1804 }
1805 #endif
1806 #ifndef OPENSSL_NO_DH
1807 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1808 {
1809 DH *dh_srvr,*dh_clnt;
1810
1811 if (s->session->sess_cert->peer_dh_tmp != NULL)
1812 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1813 else
1814 {
1815 /* we get them from the cert */
1816 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1817 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1818 goto err;
1819 }
1820
1821 /* generate a new random key */
1822 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1823 {
1824 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1825 goto err;
1826 }
1827 if (!DH_generate_key(dh_clnt))
1828 {
1829 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1830 goto err;
1831 }
1832
1833 /* use the 'p' output buffer for the DH key, but
1834 * make sure to clear it out afterwards */
1835
1836 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1837
1838 if (n <= 0)
1839 {
1840 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1841 goto err;
1842 }
1843
1844 /* generate master key from the result */
1845 s->session->master_key_length=
1846 s->method->ssl3_enc->generate_master_secret(s,
1847 s->session->master_key,p,n);
1848 /* clean up */
1849 memset(p,0,n);
1850
1851 /* send off the data */
1852 n=BN_num_bytes(dh_clnt->pub_key);
1853 s2n(n,p);
1854 BN_bn2bin(dh_clnt->pub_key,p);
1855 n+=2;
1856
1857 DH_free(dh_clnt);
1858
1859 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1860 }
1861 #endif
1862
1863 #ifndef OPENSSL_NO_ECDH
1864 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1865 {
1866 EC_GROUP *srvr_group = NULL;
1867 int ecdh_clnt_cert = 0;
1868
1869 /* Did we send out the client's
1870 * ECDH share for use in premaster
1871 * computation as part of client certificate?
1872 * If so, set ecdh_clnt_cert to 1.
1873 */
1874 if ((l & SSL_kECDH) && (s->cert != NULL))
1875 {
1876 /* XXX: For now, we do not support client
1877 * authentication using ECDH certificates.
1878 * To add such support, one needs to add
1879 * code that checks for appropriate
1880 * conditions and sets ecdh_clnt_cert to 1.
1881 * For example, the cert have an ECC
1882 * key on the same curve as the server's
1883 * and the key should be authorized for
1884 * key agreement.
1885 *
1886 * One also needs to add code in ssl3_connect
1887 * to skip sending the certificate verify
1888 * message.
1889 *
1890 * if ((s->cert->key->privatekey != NULL) &&
1891 * (s->cert->key->privatekey->type ==
1892 * EVP_PKEY_ECC) && ...)
1893 * ecdh_clnt_cert = 1;
1894 */
1895 }
1896
1897 if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1898 {
1899 srvr_group = s->session->sess_cert-> \
1900 peer_ecdh_tmp->group;
1901 srvr_ecpoint = s->session->sess_cert-> \
1902 peer_ecdh_tmp->pub_key;
1903 }
1904 else
1905 {
1906 /* Get the Server Public Key from Cert */
1907 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1908 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1909 if ((srvr_pub_pkey == NULL) ||
1910 (srvr_pub_pkey->type != EVP_PKEY_ECDSA) ||
1911 (srvr_pub_pkey->pkey.eckey == NULL))
1912 {
1913 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1914 ERR_R_INTERNAL_ERROR);
1915 goto err;
1916 }
1917
1918 srvr_group = srvr_pub_pkey->pkey.eckey->group;
1919 srvr_ecpoint =
1920 srvr_pub_pkey->pkey.eckey->pub_key;
1921 }
1922
1923 if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1924 {
1925 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1926 ERR_R_INTERNAL_ERROR);
1927 goto err;
1928 }
1929
1930 if ((clnt_ecdh=EC_KEY_new()) == NULL)
1931 {
1932 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1933 goto err;
1934 }
1935
1936 clnt_ecdh->group = srvr_group;
1937 if (ecdh_clnt_cert)
1938 {
1939 /* Reuse key info from our certificate
1940 * We only need our private key to perform
1941 * the ECDH computation.
1942 */
1943 clnt_ecdh->priv_key = BN_dup(s->cert->key-> \
1944 privatekey->pkey.eckey->priv_key);
1945 }
1946 else
1947 {
1948 /* Generate a new ECDH key pair */
1949 if (!(EC_KEY_generate_key(clnt_ecdh)))
1950 {
1951 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1952 goto err;
1953 }
1954 }
1955
1956 /* use the 'p' output buffer for the ECDH key, but
1957 * make sure to clear it out afterwards
1958 */
1959
1960 n=ECDH_compute_key(p, srvr_ecpoint, clnt_ecdh);
1961 if (n <= 0)
1962 {
1963 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1964 ERR_R_ECDH_LIB);
1965 goto err;
1966 }
1967
1968 /* generate master key from the result */
1969 s->session->master_key_length = s->method->ssl3_enc \
1970 -> generate_master_secret(s,
1971 s->session->master_key,
1972 p, n);
1973
1974 memset(p, 0, n); /* clean up */
1975
1976 if (ecdh_clnt_cert)
1977 {
1978 /* Send empty client key exch message */
1979 n = 0;
1980 }
1981 else
1982 {
1983 /* First check the size of encoding and
1984 * allocate memory accordingly.
1985 */
1986 encoded_pt_len =
1987 EC_POINT_point2oct(clnt_ecdh->group,
1988 clnt_ecdh->pub_key,
1989 POINT_CONVERSION_UNCOMPRESSED,
1990 NULL, 0, NULL);
1991
1992 encodedPoint = (unsigned char *)
1993 OPENSSL_malloc(encoded_pt_len *
1994 sizeof(unsigned char));
1995 bn_ctx = BN_CTX_new();
1996 if ((encodedPoint == NULL) ||
1997 (bn_ctx == NULL))
1998 {
1999 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2000 goto err;
2001 }
2002
2003 /* Encode the public key */
2004 n = EC_POINT_point2oct(clnt_ecdh->group,
2005 clnt_ecdh->pub_key,
2006 POINT_CONVERSION_UNCOMPRESSED,
2007 encodedPoint, encoded_pt_len, bn_ctx);
2008
2009 *p = n; /* length of encoded point */
2010 /* Encoded point will be copied here */
2011 p += 1;
2012 /* copy the point */
2013 memcpy((unsigned char *)p, encodedPoint, n);
2014 /* increment n to account for length field */
2015 n += 1;
2016 }
2017
2018 /* Free allocated memory */
2019 BN_CTX_free(bn_ctx);
2020 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2021 if (clnt_ecdh != NULL)
2022 {
2023 /* group is shared */
2024 clnt_ecdh->group = NULL;
2025 EC_KEY_free(clnt_ecdh);
2026 }
2027 EVP_PKEY_free(srvr_pub_pkey);
2028 }
2029 #endif /* !OPENSSL_NO_ECDH */
2030 else
2031 {
2032 ssl3_send_alert(s, SSL3_AL_FATAL,
2033 SSL_AD_HANDSHAKE_FAILURE);
2034 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2035 ERR_R_INTERNAL_ERROR);
2036 goto err;
2037 }
2038
2039 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2040 l2n3(n,d);
2041
2042 s->state=SSL3_ST_CW_KEY_EXCH_B;
2043 /* number of bytes to write */
2044 s->init_num=n+4;
2045 s->init_off=0;
2046 }
2047
2048 /* SSL3_ST_CW_KEY_EXCH_B */
2049 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2050 err:
2051 #ifndef OPENSSL_NO_ECDH
2052 BN_CTX_free(bn_ctx);
2053 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2054 if (clnt_ecdh != NULL)
2055 {
2056 /* group is shared */
2057 clnt_ecdh->group = NULL;
2058 EC_KEY_free(clnt_ecdh);
2059 }
2060 EVP_PKEY_free(srvr_pub_pkey);
2061 #endif
2062 return(-1);
2063 }
2064
2065 static int ssl3_send_client_verify(SSL *s)
2066 {
2067 unsigned char *p,*d;
2068 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2069 EVP_PKEY *pkey;
2070 #ifndef OPENSSL_NO_RSA
2071 unsigned u=0;
2072 #endif
2073 unsigned long n;
2074 #ifndef OPENSSL_NO_DSA
2075 int j;
2076 #endif
2077
2078 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2079 {
2080 d=(unsigned char *)s->init_buf->data;
2081 p= &(d[4]);
2082 pkey=s->cert->key->privatekey;
2083
2084 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2085 &(data[MD5_DIGEST_LENGTH]));
2086
2087 #ifndef OPENSSL_NO_RSA
2088 if (pkey->type == EVP_PKEY_RSA)
2089 {
2090 s->method->ssl3_enc->cert_verify_mac(s,
2091 &(s->s3->finish_dgst1),&(data[0]));
2092 if (RSA_sign(NID_md5_sha1, data,
2093 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2094 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2095 {
2096 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2097 goto err;
2098 }
2099 s2n(u,p);
2100 n=u+2;
2101 }
2102 else
2103 #endif
2104 #ifndef OPENSSL_NO_DSA
2105 if (pkey->type == EVP_PKEY_DSA)
2106 {
2107 if (!DSA_sign(pkey->save_type,
2108 &(data[MD5_DIGEST_LENGTH]),
2109 SHA_DIGEST_LENGTH,&(p[2]),
2110 (unsigned int *)&j,pkey->pkey.dsa))
2111 {
2112 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2113 goto err;
2114 }
2115 s2n(j,p);
2116 n=j+2;
2117 }
2118 else
2119 #endif
2120 #ifndef OPENSSL_NO_ECDSA
2121 if (pkey->type == EVP_PKEY_ECDSA)
2122 {
2123 if (!ECDSA_sign(pkey->save_type,
2124 &(data[MD5_DIGEST_LENGTH]),
2125 SHA_DIGEST_LENGTH,&(p[2]),
2126 (unsigned int *)&j,pkey->pkey.eckey))
2127 {
2128 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2129 ERR_R_ECDSA_LIB);
2130 goto err;
2131 }
2132 s2n(j,p);
2133 n=j+2;
2134 }
2135 else
2136 #endif
2137 {
2138 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2139 goto err;
2140 }
2141 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2142 l2n3(n,d);
2143
2144 s->init_num=(int)n+4;
2145 s->init_off=0;
2146 }
2147 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2148 err:
2149 return(-1);
2150 }
2151
2152 static int ssl3_send_client_certificate(SSL *s)
2153 {
2154 X509 *x509=NULL;
2155 EVP_PKEY *pkey=NULL;
2156 int i;
2157 unsigned long l;
2158
2159 if (s->state == SSL3_ST_CW_CERT_A)
2160 {
2161 if ((s->cert == NULL) ||
2162 (s->cert->key->x509 == NULL) ||
2163 (s->cert->key->privatekey == NULL))
2164 s->state=SSL3_ST_CW_CERT_B;
2165 else
2166 s->state=SSL3_ST_CW_CERT_C;
2167 }
2168
2169 /* We need to get a client cert */
2170 if (s->state == SSL3_ST_CW_CERT_B)
2171 {
2172 /* If we get an error, we need to
2173 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2174 * We then get retied later */
2175 i=0;
2176 if (s->ctx->client_cert_cb != NULL)
2177 i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2178 if (i < 0)
2179 {
2180 s->rwstate=SSL_X509_LOOKUP;
2181 return(-1);
2182 }
2183 s->rwstate=SSL_NOTHING;
2184 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2185 {
2186 s->state=SSL3_ST_CW_CERT_B;
2187 if ( !SSL_use_certificate(s,x509) ||
2188 !SSL_use_PrivateKey(s,pkey))
2189 i=0;
2190 }
2191 else if (i == 1)
2192 {
2193 i=0;
2194 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2195 }
2196
2197 if (x509 != NULL) X509_free(x509);
2198 if (pkey != NULL) EVP_PKEY_free(pkey);
2199 if (i == 0)
2200 {
2201 if (s->version == SSL3_VERSION)
2202 {
2203 s->s3->tmp.cert_req=0;
2204 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2205 return(1);
2206 }
2207 else
2208 {
2209 s->s3->tmp.cert_req=2;
2210 }
2211 }
2212
2213 /* Ok, we have a cert */
2214 s->state=SSL3_ST_CW_CERT_C;
2215 }
2216
2217 if (s->state == SSL3_ST_CW_CERT_C)
2218 {
2219 s->state=SSL3_ST_CW_CERT_D;
2220 l=ssl3_output_cert_chain(s,
2221 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2222 s->init_num=(int)l;
2223 s->init_off=0;
2224 }
2225 /* SSL3_ST_CW_CERT_D */
2226 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2227 }
2228
2229 #define has_bits(i,m) (((i)&(m)) == (m))
2230
2231 static int ssl3_check_cert_and_algorithm(SSL *s)
2232 {
2233 int i,idx;
2234 long algs;
2235 EVP_PKEY *pkey=NULL;
2236 SESS_CERT *sc;
2237 #ifndef OPENSSL_NO_RSA
2238 RSA *rsa;
2239 #endif
2240 #ifndef OPENSSL_NO_DH
2241 DH *dh;
2242 #endif
2243
2244 sc=s->session->sess_cert;
2245
2246 if (sc == NULL)
2247 {
2248 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2249 goto err;
2250 }
2251
2252 algs=s->s3->tmp.new_cipher->algorithms;
2253
2254 /* we don't have a certificate */
2255 if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2256 return(1);
2257
2258 #ifndef OPENSSL_NO_RSA
2259 rsa=s->session->sess_cert->peer_rsa_tmp;
2260 #endif
2261 #ifndef OPENSSL_NO_DH
2262 dh=s->session->sess_cert->peer_dh_tmp;
2263 #endif
2264
2265 /* This is the passed certificate */
2266
2267 idx=sc->peer_cert_type;
2268 #ifndef OPENSSL_NO_ECDH
2269 if (idx == SSL_PKEY_ECC)
2270 {
2271 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2272 s->s3->tmp.new_cipher) == 0)
2273 { /* check failed */
2274 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2275 goto f_err;
2276 }
2277 else
2278 {
2279 return 1;
2280 }
2281 }
2282 #endif
2283 pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2284 i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2285 EVP_PKEY_free(pkey);
2286
2287
2288 /* Check that we have a certificate if we require one */
2289 if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2290 {
2291 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2292 goto f_err;
2293 }
2294 #ifndef OPENSSL_NO_DSA
2295 else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2296 {
2297 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2298 goto f_err;
2299 }
2300 #endif
2301 #ifndef OPENSSL_NO_RSA
2302 if ((algs & SSL_kRSA) &&
2303 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2304 {
2305 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2306 goto f_err;
2307 }
2308 #endif
2309 #ifndef OPENSSL_NO_DH
2310 if ((algs & SSL_kEDH) &&
2311 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2312 {
2313 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2314 goto f_err;
2315 }
2316 else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2317 {
2318 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2319 goto f_err;
2320 }
2321 #ifndef OPENSSL_NO_DSA
2322 else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2323 {
2324 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2325 goto f_err;
2326 }
2327 #endif
2328 #endif
2329
2330 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2331 {
2332 #ifndef OPENSSL_NO_RSA
2333 if (algs & SSL_kRSA)
2334 {
2335 if (rsa == NULL
2336 || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2337 {
2338 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2339 goto f_err;
2340 }
2341 }
2342 else
2343 #endif
2344 #ifndef OPENSSL_NO_DH
2345 if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2346 {
2347 if (dh == NULL
2348 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2349 {
2350 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2351 goto f_err;
2352 }
2353 }
2354 else
2355 #endif
2356 {
2357 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2358 goto f_err;
2359 }
2360 }
2361 return(1);
2362 f_err:
2363 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2364 err:
2365 return(0);
2366 }
2367
2368
2369 #ifndef OPENSSL_NO_ECDH
2370 /* This is the complement of nid2curve_id in s3_srvr.c. */
2371 static int curve_id2nid(int curve_id)
2372 {
2373 /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001) */
2374 static int nid_list[26] =
2375 {
2376 0,
2377 NID_sect163k1, /* sect163k1 (1) */
2378 NID_sect163r1, /* sect163r1 (2) */
2379 NID_sect163r2, /* sect163r2 (3) */
2380 NID_sect193r1, /* sect193r1 (4) */
2381 NID_sect193r2, /* sect193r2 (5) */
2382 NID_sect233k1, /* sect233k1 (6) */
2383 NID_sect233r1, /* sect233r1 (7) */
2384 NID_sect239k1, /* sect239k1 (8) */
2385 NID_sect283k1, /* sect283k1 (9) */
2386 NID_sect283r1, /* sect283r1 (10) */
2387 NID_sect409k1, /* sect409k1 (11) */
2388 NID_sect409r1, /* sect409r1 (12) */
2389 NID_sect571k1, /* sect571k1 (13) */
2390 NID_sect571r1, /* sect571r1 (14) */
2391 NID_secp160k1, /* secp160k1 (15) */
2392 NID_secp160r1, /* secp160r1 (16) */
2393 NID_secp160r2, /* secp160r2 (17) */
2394 NID_secp192k1, /* secp192k1 (18) */
2395 NID_X9_62_prime192v1, /* secp192r1 (19) */
2396 NID_secp224k1, /* secp224k1 (20) */
2397 NID_secp224r1, /* secp224r1 (21) */
2398 NID_secp256k1, /* secp256k1 (22) */
2399 NID_X9_62_prime256v1, /* secp256r1 (23) */
2400 NID_secp384r1, /* secp384r1 (24) */
2401 NID_secp521r1 /* secp521r1 (25) */
2402 };
2403
2404 if ((curve_id < 1) || (curve_id > 25)) return 0;
2405
2406 return nid_list[curve_id];
2407 }
2408 #endif
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