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[thirdparty/openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111 /* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
114 * Portions of the attached software ("Contribution") are developed by
115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116 *
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
119 *
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
124
125 #include <stdio.h>
126 #include "ssl_locl.h"
127 #include "kssl_lcl.h"
128 #include <openssl/buffer.h>
129 #include <openssl/rand.h>
130 #include <openssl/objects.h>
131 #include <openssl/evp.h>
132 #include <openssl/md5.h>
133 #include <openssl/dh.h>
134
135 static SSL_METHOD *ssl3_get_client_method(int ver);
136 static int ssl3_client_hello(SSL *s);
137 static int ssl3_get_server_hello(SSL *s);
138 static int ssl3_get_certificate_request(SSL *s);
139 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
140 static int ssl3_get_server_done(SSL *s);
141 static int ssl3_send_client_verify(SSL *s);
142 static int ssl3_send_client_certificate(SSL *s);
143 static int ssl3_send_client_key_exchange(SSL *s);
144 static int ssl3_get_key_exchange(SSL *s);
145 static int ssl3_get_server_certificate(SSL *s);
146 static int ssl3_check_cert_and_algorithm(SSL *s);
147
148 #ifndef OPENSSL_NO_ECDH
149 static int curve_id2nid(int curve_id);
150 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
151 #endif
152
153 static SSL_METHOD *ssl3_get_client_method(int ver)
154 {
155 if (ver == SSL3_VERSION)
156 return(SSLv3_client_method());
157 else
158 return(NULL);
159 }
160
161 SSL_METHOD *SSLv3_client_method(void)
162 {
163 static int init=1;
164 static SSL_METHOD SSLv3_client_data;
165
166 if (init)
167 {
168 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
169
170 if (init)
171 {
172 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
173 sizeof(SSL_METHOD));
174 SSLv3_client_data.ssl_connect=ssl3_connect;
175 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
176 init=0;
177 }
178
179 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
180 }
181 return(&SSLv3_client_data);
182 }
183
184 int ssl3_connect(SSL *s)
185 {
186 BUF_MEM *buf=NULL;
187 unsigned long Time=time(NULL),l;
188 long num1;
189 void (*cb)(const SSL *ssl,int type,int val)=NULL;
190 int ret= -1;
191 int new_state,state,skip=0;;
192
193 RAND_add(&Time,sizeof(Time),0);
194 ERR_clear_error();
195 clear_sys_error();
196
197 if (s->info_callback != NULL)
198 cb=s->info_callback;
199 else if (s->ctx->info_callback != NULL)
200 cb=s->ctx->info_callback;
201
202 s->in_handshake++;
203 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
204
205 for (;;)
206 {
207 state=s->state;
208
209 switch(s->state)
210 {
211 case SSL_ST_RENEGOTIATE:
212 s->new_session=1;
213 s->state=SSL_ST_CONNECT;
214 s->ctx->stats.sess_connect_renegotiate++;
215 /* break */
216 case SSL_ST_BEFORE:
217 case SSL_ST_CONNECT:
218 case SSL_ST_BEFORE|SSL_ST_CONNECT:
219 case SSL_ST_OK|SSL_ST_CONNECT:
220
221 s->server=0;
222 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
223
224 if ((s->version & 0xff00 ) != 0x0300)
225 {
226 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
227 ret = -1;
228 goto end;
229 }
230
231 /* s->version=SSL3_VERSION; */
232 s->type=SSL_ST_CONNECT;
233
234 if (s->init_buf == NULL)
235 {
236 if ((buf=BUF_MEM_new()) == NULL)
237 {
238 ret= -1;
239 goto end;
240 }
241 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
242 {
243 ret= -1;
244 goto end;
245 }
246 s->init_buf=buf;
247 buf=NULL;
248 }
249
250 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
251
252 /* setup buffing BIO */
253 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
254
255 /* don't push the buffering BIO quite yet */
256
257 ssl3_init_finished_mac(s);
258
259 s->state=SSL3_ST_CW_CLNT_HELLO_A;
260 s->ctx->stats.sess_connect++;
261 s->init_num=0;
262 break;
263
264 case SSL3_ST_CW_CLNT_HELLO_A:
265 case SSL3_ST_CW_CLNT_HELLO_B:
266
267 s->shutdown=0;
268 ret=ssl3_client_hello(s);
269 if (ret <= 0) goto end;
270 s->state=SSL3_ST_CR_SRVR_HELLO_A;
271 s->init_num=0;
272
273 /* turn on buffering for the next lot of output */
274 if (s->bbio != s->wbio)
275 s->wbio=BIO_push(s->bbio,s->wbio);
276
277 break;
278
279 case SSL3_ST_CR_SRVR_HELLO_A:
280 case SSL3_ST_CR_SRVR_HELLO_B:
281 ret=ssl3_get_server_hello(s);
282 if (ret <= 0) goto end;
283 if (s->hit)
284 s->state=SSL3_ST_CR_FINISHED_A;
285 else
286 s->state=SSL3_ST_CR_CERT_A;
287 s->init_num=0;
288 break;
289
290 case SSL3_ST_CR_CERT_A:
291 case SSL3_ST_CR_CERT_B:
292 /* Check if it is anon DH/ECDH */
293 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
294 {
295 ret=ssl3_get_server_certificate(s);
296 if (ret <= 0) goto end;
297 }
298 else
299 skip=1;
300 s->state=SSL3_ST_CR_KEY_EXCH_A;
301 s->init_num=0;
302 break;
303
304 case SSL3_ST_CR_KEY_EXCH_A:
305 case SSL3_ST_CR_KEY_EXCH_B:
306 ret=ssl3_get_key_exchange(s);
307 if (ret <= 0) goto end;
308 s->state=SSL3_ST_CR_CERT_REQ_A;
309 s->init_num=0;
310
311 /* at this point we check that we have the
312 * required stuff from the server */
313 if (!ssl3_check_cert_and_algorithm(s))
314 {
315 ret= -1;
316 goto end;
317 }
318 break;
319
320 case SSL3_ST_CR_CERT_REQ_A:
321 case SSL3_ST_CR_CERT_REQ_B:
322 ret=ssl3_get_certificate_request(s);
323 if (ret <= 0) goto end;
324 s->state=SSL3_ST_CR_SRVR_DONE_A;
325 s->init_num=0;
326 break;
327
328 case SSL3_ST_CR_SRVR_DONE_A:
329 case SSL3_ST_CR_SRVR_DONE_B:
330 ret=ssl3_get_server_done(s);
331 if (ret <= 0) goto end;
332 if (s->s3->tmp.cert_req)
333 s->state=SSL3_ST_CW_CERT_A;
334 else
335 s->state=SSL3_ST_CW_KEY_EXCH_A;
336 s->init_num=0;
337
338 break;
339
340 case SSL3_ST_CW_CERT_A:
341 case SSL3_ST_CW_CERT_B:
342 case SSL3_ST_CW_CERT_C:
343 case SSL3_ST_CW_CERT_D:
344 ret=ssl3_send_client_certificate(s);
345 if (ret <= 0) goto end;
346 s->state=SSL3_ST_CW_KEY_EXCH_A;
347 s->init_num=0;
348 break;
349
350 case SSL3_ST_CW_KEY_EXCH_A:
351 case SSL3_ST_CW_KEY_EXCH_B:
352 ret=ssl3_send_client_key_exchange(s);
353 if (ret <= 0) goto end;
354 l=s->s3->tmp.new_cipher->algorithms;
355 /* EAY EAY EAY need to check for DH fix cert
356 * sent back */
357 /* For TLS, cert_req is set to 2, so a cert chain
358 * of nothing is sent, but no verify packet is sent */
359 /* XXX: For now, we do not support client
360 * authentication in ECDH cipher suites with
361 * ECDH (rather than ECDSA) certificates.
362 * We need to skip the certificate verify
363 * message when client's ECDH public key is sent
364 * inside the client certificate.
365 */
366 if (s->s3->tmp.cert_req == 1)
367 {
368 s->state=SSL3_ST_CW_CERT_VRFY_A;
369 }
370 else
371 {
372 s->state=SSL3_ST_CW_CHANGE_A;
373 s->s3->change_cipher_spec=0;
374 }
375
376 s->init_num=0;
377 break;
378
379 case SSL3_ST_CW_CERT_VRFY_A:
380 case SSL3_ST_CW_CERT_VRFY_B:
381 ret=ssl3_send_client_verify(s);
382 if (ret <= 0) goto end;
383 s->state=SSL3_ST_CW_CHANGE_A;
384 s->init_num=0;
385 s->s3->change_cipher_spec=0;
386 break;
387
388 case SSL3_ST_CW_CHANGE_A:
389 case SSL3_ST_CW_CHANGE_B:
390 ret=ssl3_send_change_cipher_spec(s,
391 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
392 if (ret <= 0) goto end;
393 s->state=SSL3_ST_CW_FINISHED_A;
394 s->init_num=0;
395
396 s->session->cipher=s->s3->tmp.new_cipher;
397 if (s->s3->tmp.new_compression == NULL)
398 s->session->compress_meth=0;
399 else
400 s->session->compress_meth=
401 s->s3->tmp.new_compression->id;
402 if (!s->method->ssl3_enc->setup_key_block(s))
403 {
404 ret= -1;
405 goto end;
406 }
407
408 if (!s->method->ssl3_enc->change_cipher_state(s,
409 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
410 {
411 ret= -1;
412 goto end;
413 }
414
415 break;
416
417 case SSL3_ST_CW_FINISHED_A:
418 case SSL3_ST_CW_FINISHED_B:
419 ret=ssl3_send_finished(s,
420 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
421 s->method->ssl3_enc->client_finished_label,
422 s->method->ssl3_enc->client_finished_label_len);
423 if (ret <= 0) goto end;
424 s->state=SSL3_ST_CW_FLUSH;
425
426 /* clear flags */
427 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
428 if (s->hit)
429 {
430 s->s3->tmp.next_state=SSL_ST_OK;
431 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
432 {
433 s->state=SSL_ST_OK;
434 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
435 s->s3->delay_buf_pop_ret=0;
436 }
437 }
438 else
439 {
440 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
441 }
442 s->init_num=0;
443 break;
444
445 case SSL3_ST_CR_FINISHED_A:
446 case SSL3_ST_CR_FINISHED_B:
447
448 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
449 SSL3_ST_CR_FINISHED_B);
450 if (ret <= 0) goto end;
451
452 if (s->hit)
453 s->state=SSL3_ST_CW_CHANGE_A;
454 else
455 s->state=SSL_ST_OK;
456 s->init_num=0;
457 break;
458
459 case SSL3_ST_CW_FLUSH:
460 /* number of bytes to be flushed */
461 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
462 if (num1 > 0)
463 {
464 s->rwstate=SSL_WRITING;
465 num1=BIO_flush(s->wbio);
466 if (num1 <= 0) { ret= -1; goto end; }
467 s->rwstate=SSL_NOTHING;
468 }
469
470 s->state=s->s3->tmp.next_state;
471 break;
472
473 case SSL_ST_OK:
474 /* clean a few things up */
475 ssl3_cleanup_key_block(s);
476
477 if (s->init_buf != NULL)
478 {
479 BUF_MEM_free(s->init_buf);
480 s->init_buf=NULL;
481 }
482
483 /* If we are not 'joining' the last two packets,
484 * remove the buffering now */
485 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
486 ssl_free_wbio_buffer(s);
487 /* else do it later in ssl3_write */
488
489 s->init_num=0;
490 s->new_session=0;
491
492 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
493 if (s->hit) s->ctx->stats.sess_hit++;
494
495 ret=1;
496 /* s->server=0; */
497 s->handshake_func=ssl3_connect;
498 s->ctx->stats.sess_connect_good++;
499
500 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
501
502 goto end;
503 /* break; */
504
505 default:
506 SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
507 ret= -1;
508 goto end;
509 /* break; */
510 }
511
512 /* did we do anything */
513 if (!s->s3->tmp.reuse_message && !skip)
514 {
515 if (s->debug)
516 {
517 if ((ret=BIO_flush(s->wbio)) <= 0)
518 goto end;
519 }
520
521 if ((cb != NULL) && (s->state != state))
522 {
523 new_state=s->state;
524 s->state=state;
525 cb(s,SSL_CB_CONNECT_LOOP,1);
526 s->state=new_state;
527 }
528 }
529 skip=0;
530 }
531 end:
532 s->in_handshake--;
533 if (buf != NULL)
534 BUF_MEM_free(buf);
535 if (cb != NULL)
536 cb(s,SSL_CB_CONNECT_EXIT,ret);
537 return(ret);
538 }
539
540
541 static int ssl3_client_hello(SSL *s)
542 {
543 unsigned char *buf;
544 unsigned char *p,*d;
545 int i,j;
546 unsigned long Time,l;
547 SSL_COMP *comp;
548
549 buf=(unsigned char *)s->init_buf->data;
550 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
551 {
552 if ((s->session == NULL) ||
553 (s->session->ssl_version != s->version) ||
554 (s->session->not_resumable))
555 {
556 if (!ssl_get_new_session(s,0))
557 goto err;
558 }
559 /* else use the pre-loaded session */
560
561 p=s->s3->client_random;
562 Time=time(NULL); /* Time */
563 l2n(Time,p);
564 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
565
566 /* Do the message type and length last */
567 d=p= &(buf[4]);
568
569 *(p++)=s->version>>8;
570 *(p++)=s->version&0xff;
571 s->client_version=s->version;
572
573 /* Random stuff */
574 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
575 p+=SSL3_RANDOM_SIZE;
576
577 /* Session ID */
578 if (s->new_session)
579 i=0;
580 else
581 i=s->session->session_id_length;
582 *(p++)=i;
583 if (i != 0)
584 {
585 if (i > (int)sizeof(s->session->session_id))
586 {
587 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
588 goto err;
589 }
590 memcpy(p,s->session->session_id,i);
591 p+=i;
592 }
593
594 /* Ciphers supported */
595 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
596 if (i == 0)
597 {
598 SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
599 goto err;
600 }
601 s2n(i,p);
602 p+=i;
603
604 /* COMPRESSION */
605 if (s->ctx->comp_methods == NULL)
606 j=0;
607 else
608 j=sk_SSL_COMP_num(s->ctx->comp_methods);
609 *(p++)=1+j;
610 for (i=0; i<j; i++)
611 {
612 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
613 *(p++)=comp->id;
614 }
615 *(p++)=0; /* Add the NULL method */
616
617 l=(p-d);
618 d=buf;
619 *(d++)=SSL3_MT_CLIENT_HELLO;
620 l2n3(l,d);
621
622 s->state=SSL3_ST_CW_CLNT_HELLO_B;
623 /* number of bytes to write */
624 s->init_num=p-buf;
625 s->init_off=0;
626 }
627
628 /* SSL3_ST_CW_CLNT_HELLO_B */
629 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
630 err:
631 return(-1);
632 }
633
634 static int ssl3_get_server_hello(SSL *s)
635 {
636 STACK_OF(SSL_CIPHER) *sk;
637 SSL_CIPHER *c;
638 unsigned char *p,*d;
639 int i,al,ok;
640 unsigned int j;
641 long n;
642 SSL_COMP *comp;
643
644 n=ssl3_get_message(s,
645 SSL3_ST_CR_SRVR_HELLO_A,
646 SSL3_ST_CR_SRVR_HELLO_B,
647 SSL3_MT_SERVER_HELLO,
648 300, /* ?? */
649 &ok);
650
651 if (!ok) return((int)n);
652 d=p=(unsigned char *)s->init_msg;
653
654 if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
655 {
656 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
657 s->version=(s->version&0xff00)|p[1];
658 al=SSL_AD_PROTOCOL_VERSION;
659 goto f_err;
660 }
661 p+=2;
662
663 /* load the server hello data */
664 /* load the server random */
665 memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
666 p+=SSL3_RANDOM_SIZE;
667
668 /* get the session-id */
669 j= *(p++);
670
671 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
672 {
673 al=SSL_AD_ILLEGAL_PARAMETER;
674 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
675 goto f_err;
676 }
677
678 if (j != 0 && j == s->session->session_id_length
679 && memcmp(p,s->session->session_id,j) == 0)
680 {
681 if(s->sid_ctx_length != s->session->sid_ctx_length
682 || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
683 {
684 /* actually a client application bug */
685 al=SSL_AD_ILLEGAL_PARAMETER;
686 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
687 goto f_err;
688 }
689 s->hit=1;
690 }
691 else /* a miss or crap from the other end */
692 {
693 /* If we were trying for session-id reuse, make a new
694 * SSL_SESSION so we don't stuff up other people */
695 s->hit=0;
696 if (s->session->session_id_length > 0)
697 {
698 if (!ssl_get_new_session(s,0))
699 {
700 al=SSL_AD_INTERNAL_ERROR;
701 goto f_err;
702 }
703 }
704 s->session->session_id_length=j;
705 memcpy(s->session->session_id,p,j); /* j could be 0 */
706 }
707 p+=j;
708 c=ssl_get_cipher_by_char(s,p);
709 if (c == NULL)
710 {
711 /* unknown cipher */
712 al=SSL_AD_ILLEGAL_PARAMETER;
713 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
714 goto f_err;
715 }
716 p+=ssl_put_cipher_by_char(s,NULL,NULL);
717
718 sk=ssl_get_ciphers_by_id(s);
719 i=sk_SSL_CIPHER_find(sk,c);
720 if (i < 0)
721 {
722 /* we did not say we would use this cipher */
723 al=SSL_AD_ILLEGAL_PARAMETER;
724 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
725 goto f_err;
726 }
727
728 /* Depending on the session caching (internal/external), the cipher
729 and/or cipher_id values may not be set. Make sure that
730 cipher_id is set and use it for comparison. */
731 if (s->session->cipher)
732 s->session->cipher_id = s->session->cipher->id;
733 if (s->hit && (s->session->cipher_id != c->id))
734 {
735 if (!(s->options &
736 SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
737 {
738 al=SSL_AD_ILLEGAL_PARAMETER;
739 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
740 goto f_err;
741 }
742 }
743 s->s3->tmp.new_cipher=c;
744
745 /* lets get the compression algorithm */
746 /* COMPRESSION */
747 j= *(p++);
748 if (j == 0)
749 comp=NULL;
750 else
751 comp=ssl3_comp_find(s->ctx->comp_methods,j);
752
753 if ((j != 0) && (comp == NULL))
754 {
755 al=SSL_AD_ILLEGAL_PARAMETER;
756 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
757 goto f_err;
758 }
759 else
760 {
761 s->s3->tmp.new_compression=comp;
762 }
763
764 if (p != (d+n))
765 {
766 /* wrong packet length */
767 al=SSL_AD_DECODE_ERROR;
768 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
769 goto err;
770 }
771
772 return(1);
773 f_err:
774 ssl3_send_alert(s,SSL3_AL_FATAL,al);
775 err:
776 return(-1);
777 }
778
779 static int ssl3_get_server_certificate(SSL *s)
780 {
781 int al,i,ok,ret= -1;
782 unsigned long n,nc,llen,l;
783 X509 *x=NULL;
784 const unsigned char *q,*p;
785 unsigned char *d;
786 STACK_OF(X509) *sk=NULL;
787 SESS_CERT *sc;
788 EVP_PKEY *pkey=NULL;
789 int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
790
791 n=ssl3_get_message(s,
792 SSL3_ST_CR_CERT_A,
793 SSL3_ST_CR_CERT_B,
794 -1,
795 s->max_cert_list,
796 &ok);
797
798 if (!ok) return((int)n);
799
800 if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
801 {
802 s->s3->tmp.reuse_message=1;
803 return(1);
804 }
805
806 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
807 {
808 al=SSL_AD_UNEXPECTED_MESSAGE;
809 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
810 goto f_err;
811 }
812 p=d=(unsigned char *)s->init_msg;
813
814 if ((sk=sk_X509_new_null()) == NULL)
815 {
816 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
817 goto err;
818 }
819
820 n2l3(p,llen);
821 if (llen+3 != n)
822 {
823 al=SSL_AD_DECODE_ERROR;
824 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
825 goto f_err;
826 }
827 for (nc=0; nc<llen; )
828 {
829 n2l3(p,l);
830 if ((l+nc+3) > llen)
831 {
832 al=SSL_AD_DECODE_ERROR;
833 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
834 goto f_err;
835 }
836
837 q=p;
838 x=d2i_X509(NULL,&q,l);
839 if (x == NULL)
840 {
841 al=SSL_AD_BAD_CERTIFICATE;
842 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
843 goto f_err;
844 }
845 if (q != (p+l))
846 {
847 al=SSL_AD_DECODE_ERROR;
848 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
849 goto f_err;
850 }
851 if (!sk_X509_push(sk,x))
852 {
853 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
854 goto err;
855 }
856 x=NULL;
857 nc+=l+3;
858 p=q;
859 }
860
861 i=ssl_verify_cert_chain(s,sk);
862 if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
863 #ifndef OPENSSL_NO_KRB5
864 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
865 != (SSL_aKRB5|SSL_kKRB5)
866 #endif /* OPENSSL_NO_KRB5 */
867 )
868 {
869 al=ssl_verify_alarm_type(s->verify_result);
870 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
871 goto f_err;
872 }
873 ERR_clear_error(); /* but we keep s->verify_result */
874
875 sc=ssl_sess_cert_new();
876 if (sc == NULL) goto err;
877
878 if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
879 s->session->sess_cert=sc;
880
881 sc->cert_chain=sk;
882 /* Inconsistency alert: cert_chain does include the peer's
883 * certificate, which we don't include in s3_srvr.c */
884 x=sk_X509_value(sk,0);
885 sk=NULL;
886 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
887
888 pkey=X509_get_pubkey(x);
889
890 /* VRS: allow null cert if auth == KRB5 */
891 need_cert = ((s->s3->tmp.new_cipher->algorithms
892 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
893 == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
894
895 #ifdef KSSL_DEBUG
896 printf("pkey,x = %p, %p\n", pkey,x);
897 printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
898 printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
899 s->s3->tmp.new_cipher->algorithms, need_cert);
900 #endif /* KSSL_DEBUG */
901
902 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
903 {
904 x=NULL;
905 al=SSL3_AL_FATAL;
906 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
907 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
908 goto f_err;
909 }
910
911 i=ssl_cert_type(x,pkey);
912 if (need_cert && i < 0)
913 {
914 x=NULL;
915 al=SSL3_AL_FATAL;
916 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
917 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
918 goto f_err;
919 }
920
921 if (need_cert)
922 {
923 sc->peer_cert_type=i;
924 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
925 /* Why would the following ever happen?
926 * We just created sc a couple of lines ago. */
927 if (sc->peer_pkeys[i].x509 != NULL)
928 X509_free(sc->peer_pkeys[i].x509);
929 sc->peer_pkeys[i].x509=x;
930 sc->peer_key= &(sc->peer_pkeys[i]);
931
932 if (s->session->peer != NULL)
933 X509_free(s->session->peer);
934 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
935 s->session->peer=x;
936 }
937 else
938 {
939 sc->peer_cert_type=i;
940 sc->peer_key= NULL;
941
942 if (s->session->peer != NULL)
943 X509_free(s->session->peer);
944 s->session->peer=NULL;
945 }
946 s->session->verify_result = s->verify_result;
947
948 x=NULL;
949 ret=1;
950
951 if (0)
952 {
953 f_err:
954 ssl3_send_alert(s,SSL3_AL_FATAL,al);
955 }
956 err:
957 EVP_PKEY_free(pkey);
958 X509_free(x);
959 sk_X509_pop_free(sk,X509_free);
960 return(ret);
961 }
962
963 static int ssl3_get_key_exchange(SSL *s)
964 {
965 #ifndef OPENSSL_NO_RSA
966 unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
967 #endif
968 EVP_MD_CTX md_ctx;
969 unsigned char *param,*p;
970 int al,i,j,param_len,ok;
971 long n,alg;
972 EVP_PKEY *pkey=NULL;
973 #ifndef OPENSSL_NO_RSA
974 RSA *rsa=NULL;
975 #endif
976 #ifndef OPENSSL_NO_DH
977 DH *dh=NULL;
978 #endif
979 #ifndef OPENSSL_NO_ECDH
980 EC_KEY *ecdh = NULL;
981 BN_CTX *bn_ctx = NULL;
982 EC_POINT *srvr_ecpoint = NULL;
983 int curve_nid = 0;
984 int encoded_pt_len = 0;
985 #endif
986
987 /* use same message size as in ssl3_get_certificate_request()
988 * as ServerKeyExchange message may be skipped */
989 n=ssl3_get_message(s,
990 SSL3_ST_CR_KEY_EXCH_A,
991 SSL3_ST_CR_KEY_EXCH_B,
992 -1,
993 s->max_cert_list,
994 &ok);
995
996 if (!ok) return((int)n);
997
998 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
999 {
1000 s->s3->tmp.reuse_message=1;
1001 return(1);
1002 }
1003
1004 param=p=(unsigned char *)s->init_msg;
1005
1006 if (s->session->sess_cert != NULL)
1007 {
1008 #ifndef OPENSSL_NO_RSA
1009 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1010 {
1011 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1012 s->session->sess_cert->peer_rsa_tmp=NULL;
1013 }
1014 #endif
1015 #ifndef OPENSSL_NO_DH
1016 if (s->session->sess_cert->peer_dh_tmp)
1017 {
1018 DH_free(s->session->sess_cert->peer_dh_tmp);
1019 s->session->sess_cert->peer_dh_tmp=NULL;
1020 }
1021 #endif
1022 #ifndef OPENSSL_NO_ECDH
1023 if (s->session->sess_cert->peer_ecdh_tmp)
1024 {
1025 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1026 s->session->sess_cert->peer_ecdh_tmp=NULL;
1027 }
1028 #endif
1029 }
1030 else
1031 {
1032 s->session->sess_cert=ssl_sess_cert_new();
1033 }
1034
1035 param_len=0;
1036 alg=s->s3->tmp.new_cipher->algorithms;
1037 EVP_MD_CTX_init(&md_ctx);
1038
1039 #ifndef OPENSSL_NO_RSA
1040 if (alg & SSL_kRSA)
1041 {
1042 if ((rsa=RSA_new()) == NULL)
1043 {
1044 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1045 goto err;
1046 }
1047 n2s(p,i);
1048 param_len=i+2;
1049 if (param_len > n)
1050 {
1051 al=SSL_AD_DECODE_ERROR;
1052 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1053 goto f_err;
1054 }
1055 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1056 {
1057 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1058 goto err;
1059 }
1060 p+=i;
1061
1062 n2s(p,i);
1063 param_len+=i+2;
1064 if (param_len > n)
1065 {
1066 al=SSL_AD_DECODE_ERROR;
1067 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1068 goto f_err;
1069 }
1070 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1071 {
1072 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1073 goto err;
1074 }
1075 p+=i;
1076 n-=param_len;
1077
1078 /* this should be because we are using an export cipher */
1079 if (alg & SSL_aRSA)
1080 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1081 else
1082 {
1083 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1084 goto err;
1085 }
1086 s->session->sess_cert->peer_rsa_tmp=rsa;
1087 rsa=NULL;
1088 }
1089 #else /* OPENSSL_NO_RSA */
1090 if (0)
1091 ;
1092 #endif
1093 #ifndef OPENSSL_NO_DH
1094 else if (alg & SSL_kEDH)
1095 {
1096 if ((dh=DH_new()) == NULL)
1097 {
1098 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1099 goto err;
1100 }
1101 n2s(p,i);
1102 param_len=i+2;
1103 if (param_len > n)
1104 {
1105 al=SSL_AD_DECODE_ERROR;
1106 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1107 goto f_err;
1108 }
1109 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1110 {
1111 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1112 goto err;
1113 }
1114 p+=i;
1115
1116 n2s(p,i);
1117 param_len+=i+2;
1118 if (param_len > n)
1119 {
1120 al=SSL_AD_DECODE_ERROR;
1121 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1122 goto f_err;
1123 }
1124 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1125 {
1126 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1127 goto err;
1128 }
1129 p+=i;
1130
1131 n2s(p,i);
1132 param_len+=i+2;
1133 if (param_len > n)
1134 {
1135 al=SSL_AD_DECODE_ERROR;
1136 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1137 goto f_err;
1138 }
1139 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1140 {
1141 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1142 goto err;
1143 }
1144 p+=i;
1145 n-=param_len;
1146
1147 #ifndef OPENSSL_NO_RSA
1148 if (alg & SSL_aRSA)
1149 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1150 #else
1151 if (0)
1152 ;
1153 #endif
1154 #ifndef OPENSSL_NO_DSA
1155 else if (alg & SSL_aDSS)
1156 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1157 #endif
1158 /* else anonymous DH, so no certificate or pkey. */
1159
1160 s->session->sess_cert->peer_dh_tmp=dh;
1161 dh=NULL;
1162 }
1163 else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1164 {
1165 al=SSL_AD_ILLEGAL_PARAMETER;
1166 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1167 goto f_err;
1168 }
1169 #endif /* !OPENSSL_NO_DH */
1170
1171 #ifndef OPENSSL_NO_ECDH
1172 else if (alg & SSL_kECDHE)
1173 {
1174 if ((ecdh=EC_KEY_new()) == NULL)
1175 {
1176 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1177 goto err;
1178 }
1179
1180 /* Extract elliptic curve parameters and the
1181 * server's ephemeral ECDH public key.
1182 * Keep accumulating lengths of various components in
1183 * param_len and make sure it never exceeds n.
1184 */
1185
1186 /* XXX: For now we only support named (not generic) curves
1187 * and the ECParameters in this case is just two bytes.
1188 */
1189 param_len=2;
1190 if ((param_len > n) ||
1191 (*p != NAMED_CURVE_TYPE) ||
1192 ((curve_nid = curve_id2nid(*(p + 1))) == 0))
1193 {
1194 al=SSL_AD_INTERNAL_ERROR;
1195 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1196 goto f_err;
1197 }
1198
1199 if (!(ecdh->group=EC_GROUP_new_by_nid(curve_nid)))
1200 {
1201 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1202 goto err;
1203 }
1204
1205 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1206 (EC_GROUP_get_degree(ecdh->group) > 163))
1207 {
1208 al=SSL_AD_EXPORT_RESTRICTION;
1209 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1210 goto f_err;
1211 }
1212
1213 p+=2;
1214
1215 /* Next, get the encoded ECPoint */
1216 if (((srvr_ecpoint = EC_POINT_new(ecdh->group)) == NULL) ||
1217 ((bn_ctx = BN_CTX_new()) == NULL))
1218 {
1219 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1220 goto err;
1221 }
1222
1223 encoded_pt_len = *p; /* length of encoded point */
1224 p+=1;
1225 param_len += (1 + encoded_pt_len);
1226 if ((param_len > n) ||
1227 (EC_POINT_oct2point(ecdh->group, srvr_ecpoint,
1228 p, encoded_pt_len, bn_ctx) == 0))
1229 {
1230 al=SSL_AD_DECODE_ERROR;
1231 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1232 goto f_err;
1233 }
1234
1235 n-=param_len;
1236 p+=encoded_pt_len;
1237
1238 /* The ECC/TLS specification does not mention
1239 * the use of DSA to sign ECParameters in the server
1240 * key exchange message. We do support RSA and ECDSA.
1241 */
1242 if (0) ;
1243 #ifndef OPENSSL_NO_RSA
1244 else if (alg & SSL_aRSA)
1245 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1246 #endif
1247 #ifndef OPENSSL_NO_ECDSA
1248 else if (alg & SSL_aECDSA)
1249 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1250 #endif
1251 /* else anonymous ECDH, so no certificate or pkey. */
1252 ecdh->pub_key = srvr_ecpoint;
1253 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1254 ecdh=NULL;
1255 BN_CTX_free(bn_ctx);
1256 srvr_ecpoint = NULL;
1257 }
1258 else if (alg & SSL_kECDH)
1259 {
1260 al=SSL_AD_UNEXPECTED_MESSAGE;
1261 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1262 goto f_err;
1263 }
1264 #endif /* !OPENSSL_NO_ECDH */
1265 if (alg & SSL_aFZA)
1266 {
1267 al=SSL_AD_HANDSHAKE_FAILURE;
1268 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1269 goto f_err;
1270 }
1271
1272
1273 /* p points to the next byte, there are 'n' bytes left */
1274
1275 /* if it was signed, check the signature */
1276 if (pkey != NULL)
1277 {
1278 n2s(p,i);
1279 n-=2;
1280 j=EVP_PKEY_size(pkey);
1281
1282 if ((i != n) || (n > j) || (n <= 0))
1283 {
1284 /* wrong packet length */
1285 al=SSL_AD_DECODE_ERROR;
1286 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1287 goto f_err;
1288 }
1289
1290 #ifndef OPENSSL_NO_RSA
1291 if (pkey->type == EVP_PKEY_RSA)
1292 {
1293 int num;
1294
1295 j=0;
1296 q=md_buf;
1297 for (num=2; num > 0; num--)
1298 {
1299 EVP_DigestInit_ex(&md_ctx,(num == 2)
1300 ?s->ctx->md5:s->ctx->sha1, NULL);
1301 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1302 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1303 EVP_DigestUpdate(&md_ctx,param,param_len);
1304 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1305 q+=i;
1306 j+=i;
1307 }
1308 i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1309 pkey->pkey.rsa);
1310 if (i < 0)
1311 {
1312 al=SSL_AD_DECRYPT_ERROR;
1313 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1314 goto f_err;
1315 }
1316 if (i == 0)
1317 {
1318 /* bad signature */
1319 al=SSL_AD_DECRYPT_ERROR;
1320 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1321 goto f_err;
1322 }
1323 }
1324 else
1325 #endif
1326 #ifndef OPENSSL_NO_DSA
1327 if (pkey->type == EVP_PKEY_DSA)
1328 {
1329 /* lets do DSS */
1330 EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1331 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1332 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1333 EVP_VerifyUpdate(&md_ctx,param,param_len);
1334 if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1335 {
1336 /* bad signature */
1337 al=SSL_AD_DECRYPT_ERROR;
1338 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1339 goto f_err;
1340 }
1341 }
1342 else
1343 #endif
1344 #ifndef OPENSSL_NO_ECDSA
1345 if (pkey->type == EVP_PKEY_EC)
1346 {
1347 /* let's do ECDSA */
1348 EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1349 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1350 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1351 EVP_VerifyUpdate(&md_ctx,param,param_len);
1352 if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1353 {
1354 /* bad signature */
1355 al=SSL_AD_DECRYPT_ERROR;
1356 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1357 goto f_err;
1358 }
1359 }
1360 else
1361 #endif
1362 {
1363 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1364 goto err;
1365 }
1366 }
1367 else
1368 {
1369 /* still data left over */
1370 if (!(alg & SSL_aNULL))
1371 {
1372 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1373 goto err;
1374 }
1375 if (n != 0)
1376 {
1377 al=SSL_AD_DECODE_ERROR;
1378 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1379 goto f_err;
1380 }
1381 }
1382 EVP_PKEY_free(pkey);
1383 EVP_MD_CTX_cleanup(&md_ctx);
1384 return(1);
1385 f_err:
1386 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1387 err:
1388 EVP_PKEY_free(pkey);
1389 #ifndef OPENSSL_NO_RSA
1390 if (rsa != NULL)
1391 RSA_free(rsa);
1392 #endif
1393 #ifndef OPENSSL_NO_DH
1394 if (dh != NULL)
1395 DH_free(dh);
1396 #endif
1397 #ifndef OPENSSL_NO_ECDH
1398 BN_CTX_free(bn_ctx);
1399 EC_POINT_free(srvr_ecpoint);
1400 if (ecdh != NULL)
1401 EC_KEY_free(ecdh);
1402 #endif
1403 EVP_MD_CTX_cleanup(&md_ctx);
1404 return(-1);
1405 }
1406
1407 static int ssl3_get_certificate_request(SSL *s)
1408 {
1409 int ok,ret=0;
1410 unsigned long n,nc,l;
1411 unsigned int llen,ctype_num,i;
1412 X509_NAME *xn=NULL;
1413 const unsigned char *p,*q;
1414 unsigned char *d;
1415 STACK_OF(X509_NAME) *ca_sk=NULL;
1416
1417 n=ssl3_get_message(s,
1418 SSL3_ST_CR_CERT_REQ_A,
1419 SSL3_ST_CR_CERT_REQ_B,
1420 -1,
1421 s->max_cert_list,
1422 &ok);
1423
1424 if (!ok) return((int)n);
1425
1426 s->s3->tmp.cert_req=0;
1427
1428 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1429 {
1430 s->s3->tmp.reuse_message=1;
1431 return(1);
1432 }
1433
1434 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1435 {
1436 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1437 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1438 goto err;
1439 }
1440
1441 /* TLS does not like anon-DH with client cert */
1442 if (s->version > SSL3_VERSION)
1443 {
1444 l=s->s3->tmp.new_cipher->algorithms;
1445 if (l & SSL_aNULL)
1446 {
1447 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1448 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1449 goto err;
1450 }
1451 }
1452
1453 p=d=(unsigned char *)s->init_msg;
1454
1455 if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1456 {
1457 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1458 goto err;
1459 }
1460
1461 /* get the certificate types */
1462 ctype_num= *(p++);
1463 if (ctype_num > SSL3_CT_NUMBER)
1464 ctype_num=SSL3_CT_NUMBER;
1465 for (i=0; i<ctype_num; i++)
1466 s->s3->tmp.ctype[i]= p[i];
1467 p+=ctype_num;
1468
1469 /* get the CA RDNs */
1470 n2s(p,llen);
1471 #if 0
1472 {
1473 FILE *out;
1474 out=fopen("/tmp/vsign.der","w");
1475 fwrite(p,1,llen,out);
1476 fclose(out);
1477 }
1478 #endif
1479
1480 if ((llen+ctype_num+2+1) != n)
1481 {
1482 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1483 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1484 goto err;
1485 }
1486
1487 for (nc=0; nc<llen; )
1488 {
1489 n2s(p,l);
1490 if ((l+nc+2) > llen)
1491 {
1492 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1493 goto cont; /* netscape bugs */
1494 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1495 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1496 goto err;
1497 }
1498
1499 q=p;
1500
1501 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1502 {
1503 /* If netscape tolerance is on, ignore errors */
1504 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1505 goto cont;
1506 else
1507 {
1508 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1509 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1510 goto err;
1511 }
1512 }
1513
1514 if (q != (p+l))
1515 {
1516 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1517 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1518 goto err;
1519 }
1520 if (!sk_X509_NAME_push(ca_sk,xn))
1521 {
1522 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1523 goto err;
1524 }
1525
1526 p+=l;
1527 nc+=l+2;
1528 }
1529
1530 if (0)
1531 {
1532 cont:
1533 ERR_clear_error();
1534 }
1535
1536 /* we should setup a certificate to return.... */
1537 s->s3->tmp.cert_req=1;
1538 s->s3->tmp.ctype_num=ctype_num;
1539 if (s->s3->tmp.ca_names != NULL)
1540 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1541 s->s3->tmp.ca_names=ca_sk;
1542 ca_sk=NULL;
1543
1544 ret=1;
1545 err:
1546 if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1547 return(ret);
1548 }
1549
1550 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1551 {
1552 return(X509_NAME_cmp(*a,*b));
1553 }
1554
1555 static int ssl3_get_server_done(SSL *s)
1556 {
1557 int ok,ret=0;
1558 long n;
1559
1560 n=ssl3_get_message(s,
1561 SSL3_ST_CR_SRVR_DONE_A,
1562 SSL3_ST_CR_SRVR_DONE_B,
1563 SSL3_MT_SERVER_DONE,
1564 30, /* should be very small, like 0 :-) */
1565 &ok);
1566
1567 if (!ok) return((int)n);
1568 if (n > 0)
1569 {
1570 /* should contain no data */
1571 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1572 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1573 return -1;
1574 }
1575 ret=1;
1576 return(ret);
1577 }
1578
1579
1580 static const int KDF1_SHA1_len = 20;
1581 static void *KDF1_SHA1(void *in, size_t inlen, void *out, size_t outlen)
1582 {
1583 #ifndef OPENSSL_NO_SHA
1584 if (outlen != SHA_DIGEST_LENGTH)
1585 return NULL;
1586 return SHA1(in, inlen, out);
1587 #else
1588 return NULL;
1589 #endif
1590 }
1591
1592 static int ssl3_send_client_key_exchange(SSL *s)
1593 {
1594 unsigned char *p,*d;
1595 int n;
1596 unsigned long l;
1597 #ifndef OPENSSL_NO_RSA
1598 unsigned char *q;
1599 EVP_PKEY *pkey=NULL;
1600 #endif
1601 #ifndef OPENSSL_NO_KRB5
1602 KSSL_ERR kssl_err;
1603 #endif /* OPENSSL_NO_KRB5 */
1604 #ifndef OPENSSL_NO_ECDH
1605 EC_KEY *clnt_ecdh = NULL;
1606 EC_POINT *srvr_ecpoint = NULL;
1607 EVP_PKEY *srvr_pub_pkey = NULL;
1608 unsigned char *encodedPoint = NULL;
1609 int encoded_pt_len = 0;
1610 BN_CTX * bn_ctx = NULL;
1611 #endif
1612
1613 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1614 {
1615 d=(unsigned char *)s->init_buf->data;
1616 p= &(d[4]);
1617
1618 l=s->s3->tmp.new_cipher->algorithms;
1619
1620 /* Fool emacs indentation */
1621 if (0) {}
1622 #ifndef OPENSSL_NO_RSA
1623 else if (l & SSL_kRSA)
1624 {
1625 RSA *rsa;
1626 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1627
1628 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1629 rsa=s->session->sess_cert->peer_rsa_tmp;
1630 else
1631 {
1632 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1633 if ((pkey == NULL) ||
1634 (pkey->type != EVP_PKEY_RSA) ||
1635 (pkey->pkey.rsa == NULL))
1636 {
1637 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1638 goto err;
1639 }
1640 rsa=pkey->pkey.rsa;
1641 EVP_PKEY_free(pkey);
1642 }
1643
1644 tmp_buf[0]=s->client_version>>8;
1645 tmp_buf[1]=s->client_version&0xff;
1646 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1647 goto err;
1648
1649 s->session->master_key_length=sizeof tmp_buf;
1650
1651 q=p;
1652 /* Fix buf for TLS and beyond */
1653 if (s->version > SSL3_VERSION)
1654 p+=2;
1655 n=RSA_public_encrypt(sizeof tmp_buf,
1656 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1657 #ifdef PKCS1_CHECK
1658 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1659 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1660 #endif
1661 if (n <= 0)
1662 {
1663 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1664 goto err;
1665 }
1666
1667 /* Fix buf for TLS and beyond */
1668 if (s->version > SSL3_VERSION)
1669 {
1670 s2n(n,q);
1671 n+=2;
1672 }
1673
1674 s->session->master_key_length=
1675 s->method->ssl3_enc->generate_master_secret(s,
1676 s->session->master_key,
1677 tmp_buf,sizeof tmp_buf);
1678 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1679 }
1680 #endif
1681 #ifndef OPENSSL_NO_KRB5
1682 else if (l & SSL_kKRB5)
1683 {
1684 krb5_error_code krb5rc;
1685 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1686 /* krb5_data krb5_ap_req; */
1687 krb5_data *enc_ticket;
1688 krb5_data authenticator, *authp = NULL;
1689 EVP_CIPHER_CTX ciph_ctx;
1690 EVP_CIPHER *enc = NULL;
1691 unsigned char iv[EVP_MAX_IV_LENGTH];
1692 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1693 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
1694 + EVP_MAX_IV_LENGTH];
1695 int padl, outl = sizeof(epms);
1696
1697 EVP_CIPHER_CTX_init(&ciph_ctx);
1698
1699 #ifdef KSSL_DEBUG
1700 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1701 l, SSL_kKRB5);
1702 #endif /* KSSL_DEBUG */
1703
1704 authp = NULL;
1705 #ifdef KRB5SENDAUTH
1706 if (KRB5SENDAUTH) authp = &authenticator;
1707 #endif /* KRB5SENDAUTH */
1708
1709 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1710 &kssl_err);
1711 enc = kssl_map_enc(kssl_ctx->enctype);
1712 if (enc == NULL)
1713 goto err;
1714 #ifdef KSSL_DEBUG
1715 {
1716 printf("kssl_cget_tkt rtn %d\n", krb5rc);
1717 if (krb5rc && kssl_err.text)
1718 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1719 }
1720 #endif /* KSSL_DEBUG */
1721
1722 if (krb5rc)
1723 {
1724 ssl3_send_alert(s,SSL3_AL_FATAL,
1725 SSL_AD_HANDSHAKE_FAILURE);
1726 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1727 kssl_err.reason);
1728 goto err;
1729 }
1730
1731 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
1732 ** in place of RFC 2712 KerberosWrapper, as in:
1733 **
1734 ** Send ticket (copy to *p, set n = length)
1735 ** n = krb5_ap_req.length;
1736 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1737 ** if (krb5_ap_req.data)
1738 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1739 **
1740 ** Now using real RFC 2712 KerberosWrapper
1741 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1742 ** Note: 2712 "opaque" types are here replaced
1743 ** with a 2-byte length followed by the value.
1744 ** Example:
1745 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1746 ** Where "xx xx" = length bytes. Shown here with
1747 ** optional authenticator omitted.
1748 */
1749
1750 /* KerberosWrapper.Ticket */
1751 s2n(enc_ticket->length,p);
1752 memcpy(p, enc_ticket->data, enc_ticket->length);
1753 p+= enc_ticket->length;
1754 n = enc_ticket->length + 2;
1755
1756 /* KerberosWrapper.Authenticator */
1757 if (authp && authp->length)
1758 {
1759 s2n(authp->length,p);
1760 memcpy(p, authp->data, authp->length);
1761 p+= authp->length;
1762 n+= authp->length + 2;
1763
1764 free(authp->data);
1765 authp->data = NULL;
1766 authp->length = 0;
1767 }
1768 else
1769 {
1770 s2n(0,p);/* null authenticator length */
1771 n+=2;
1772 }
1773
1774 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1775 goto err;
1776
1777 /* 20010420 VRS. Tried it this way; failed.
1778 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1779 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1780 ** kssl_ctx->length);
1781 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1782 */
1783
1784 memset(iv, 0, sizeof iv); /* per RFC 1510 */
1785 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1786 kssl_ctx->key,iv);
1787 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1788 sizeof tmp_buf);
1789 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1790 outl += padl;
1791 if (outl > sizeof epms)
1792 {
1793 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1794 goto err;
1795 }
1796 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1797
1798 /* KerberosWrapper.EncryptedPreMasterSecret */
1799 s2n(outl,p);
1800 memcpy(p, epms, outl);
1801 p+=outl;
1802 n+=outl + 2;
1803
1804 s->session->master_key_length=
1805 s->method->ssl3_enc->generate_master_secret(s,
1806 s->session->master_key,
1807 tmp_buf, sizeof tmp_buf);
1808
1809 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1810 OPENSSL_cleanse(epms, outl);
1811 }
1812 #endif
1813 #ifndef OPENSSL_NO_DH
1814 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1815 {
1816 DH *dh_srvr,*dh_clnt;
1817
1818 if (s->session->sess_cert->peer_dh_tmp != NULL)
1819 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1820 else
1821 {
1822 /* we get them from the cert */
1823 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1824 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1825 goto err;
1826 }
1827
1828 /* generate a new random key */
1829 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1830 {
1831 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1832 goto err;
1833 }
1834 if (!DH_generate_key(dh_clnt))
1835 {
1836 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1837 goto err;
1838 }
1839
1840 /* use the 'p' output buffer for the DH key, but
1841 * make sure to clear it out afterwards */
1842
1843 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1844
1845 if (n <= 0)
1846 {
1847 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1848 goto err;
1849 }
1850
1851 /* generate master key from the result */
1852 s->session->master_key_length=
1853 s->method->ssl3_enc->generate_master_secret(s,
1854 s->session->master_key,p,n);
1855 /* clean up */
1856 memset(p,0,n);
1857
1858 /* send off the data */
1859 n=BN_num_bytes(dh_clnt->pub_key);
1860 s2n(n,p);
1861 BN_bn2bin(dh_clnt->pub_key,p);
1862 n+=2;
1863
1864 DH_free(dh_clnt);
1865
1866 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1867 }
1868 #endif
1869
1870 #ifndef OPENSSL_NO_ECDH
1871 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1872 {
1873 EC_GROUP *srvr_group = NULL;
1874 int ecdh_clnt_cert = 0;
1875 int field_size = 0;
1876
1877 /* Did we send out the client's
1878 * ECDH share for use in premaster
1879 * computation as part of client certificate?
1880 * If so, set ecdh_clnt_cert to 1.
1881 */
1882 if ((l & SSL_kECDH) && (s->cert != NULL))
1883 {
1884 /* XXX: For now, we do not support client
1885 * authentication using ECDH certificates.
1886 * To add such support, one needs to add
1887 * code that checks for appropriate
1888 * conditions and sets ecdh_clnt_cert to 1.
1889 * For example, the cert have an ECC
1890 * key on the same curve as the server's
1891 * and the key should be authorized for
1892 * key agreement.
1893 *
1894 * One also needs to add code in ssl3_connect
1895 * to skip sending the certificate verify
1896 * message.
1897 *
1898 * if ((s->cert->key->privatekey != NULL) &&
1899 * (s->cert->key->privatekey->type ==
1900 * EVP_PKEY_EC) && ...)
1901 * ecdh_clnt_cert = 1;
1902 */
1903 }
1904
1905 if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1906 {
1907 srvr_group = s->session->sess_cert-> \
1908 peer_ecdh_tmp->group;
1909 srvr_ecpoint = s->session->sess_cert-> \
1910 peer_ecdh_tmp->pub_key;
1911 }
1912 else
1913 {
1914 /* Get the Server Public Key from Cert */
1915 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1916 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1917 if ((srvr_pub_pkey == NULL) ||
1918 (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1919 (srvr_pub_pkey->pkey.eckey == NULL))
1920 {
1921 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1922 ERR_R_INTERNAL_ERROR);
1923 goto err;
1924 }
1925
1926 srvr_group = srvr_pub_pkey->pkey.eckey->group;
1927 srvr_ecpoint =
1928 srvr_pub_pkey->pkey.eckey->pub_key;
1929 }
1930
1931 if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1932 {
1933 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1934 ERR_R_INTERNAL_ERROR);
1935 goto err;
1936 }
1937
1938 if ((clnt_ecdh=EC_KEY_new()) == NULL)
1939 {
1940 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1941 goto err;
1942 }
1943
1944 clnt_ecdh->group = srvr_group;
1945 if (ecdh_clnt_cert)
1946 {
1947 /* Reuse key info from our certificate
1948 * We only need our private key to perform
1949 * the ECDH computation.
1950 */
1951 clnt_ecdh->priv_key = BN_dup(s->cert->key-> \
1952 privatekey->pkey.eckey->priv_key);
1953 }
1954 else
1955 {
1956 /* Generate a new ECDH key pair */
1957 if (!(EC_KEY_generate_key(clnt_ecdh)))
1958 {
1959 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1960 goto err;
1961 }
1962 }
1963
1964 /* use the 'p' output buffer for the ECDH key, but
1965 * make sure to clear it out afterwards
1966 */
1967
1968 field_size = EC_GROUP_get_degree(clnt_ecdh->group);
1969 if (field_size <= 0)
1970 {
1971 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1972 ERR_R_ECDH_LIB);
1973 goto err;
1974 }
1975 /* If field size is not more than 24 octets, then use SHA-1 hash of result;
1976 * otherwise, use result (see section 4.8 of draft-ietf-tls-ecc-03.txt;
1977 * this is new with this version of the Internet Draft).
1978 */
1979 if (field_size <= 24 * 8)
1980 n=ECDH_compute_key(p, KDF1_SHA1_len, srvr_ecpoint, clnt_ecdh, KDF1_SHA1);
1981 else
1982 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1983 if (n <= 0)
1984 {
1985 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1986 ERR_R_ECDH_LIB);
1987 goto err;
1988 }
1989
1990 /* generate master key from the result */
1991 s->session->master_key_length = s->method->ssl3_enc \
1992 -> generate_master_secret(s,
1993 s->session->master_key,
1994 p, n);
1995
1996 memset(p, 0, n); /* clean up */
1997
1998 if (ecdh_clnt_cert)
1999 {
2000 /* Send empty client key exch message */
2001 n = 0;
2002 }
2003 else
2004 {
2005 /* First check the size of encoding and
2006 * allocate memory accordingly.
2007 */
2008 encoded_pt_len =
2009 EC_POINT_point2oct(clnt_ecdh->group,
2010 clnt_ecdh->pub_key,
2011 POINT_CONVERSION_UNCOMPRESSED,
2012 NULL, 0, NULL);
2013
2014 encodedPoint = (unsigned char *)
2015 OPENSSL_malloc(encoded_pt_len *
2016 sizeof(unsigned char));
2017 bn_ctx = BN_CTX_new();
2018 if ((encodedPoint == NULL) ||
2019 (bn_ctx == NULL))
2020 {
2021 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2022 goto err;
2023 }
2024
2025 /* Encode the public key */
2026 n = EC_POINT_point2oct(clnt_ecdh->group,
2027 clnt_ecdh->pub_key,
2028 POINT_CONVERSION_UNCOMPRESSED,
2029 encodedPoint, encoded_pt_len, bn_ctx);
2030
2031 *p = n; /* length of encoded point */
2032 /* Encoded point will be copied here */
2033 p += 1;
2034 /* copy the point */
2035 memcpy((unsigned char *)p, encodedPoint, n);
2036 /* increment n to account for length field */
2037 n += 1;
2038 }
2039
2040 /* Free allocated memory */
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 }
2051 #endif /* !OPENSSL_NO_ECDH */
2052 else
2053 {
2054 ssl3_send_alert(s, SSL3_AL_FATAL,
2055 SSL_AD_HANDSHAKE_FAILURE);
2056 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2057 ERR_R_INTERNAL_ERROR);
2058 goto err;
2059 }
2060
2061 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2062 l2n3(n,d);
2063
2064 s->state=SSL3_ST_CW_KEY_EXCH_B;
2065 /* number of bytes to write */
2066 s->init_num=n+4;
2067 s->init_off=0;
2068 }
2069
2070 /* SSL3_ST_CW_KEY_EXCH_B */
2071 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2072 err:
2073 #ifndef OPENSSL_NO_ECDH
2074 BN_CTX_free(bn_ctx);
2075 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2076 if (clnt_ecdh != NULL)
2077 {
2078 /* group is shared */
2079 clnt_ecdh->group = NULL;
2080 EC_KEY_free(clnt_ecdh);
2081 }
2082 EVP_PKEY_free(srvr_pub_pkey);
2083 #endif
2084 return(-1);
2085 }
2086
2087 static int ssl3_send_client_verify(SSL *s)
2088 {
2089 unsigned char *p,*d;
2090 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2091 EVP_PKEY *pkey;
2092 #ifndef OPENSSL_NO_RSA
2093 unsigned u=0;
2094 #endif
2095 unsigned long n;
2096 #ifndef OPENSSL_NO_DSA
2097 int j;
2098 #endif
2099
2100 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2101 {
2102 d=(unsigned char *)s->init_buf->data;
2103 p= &(d[4]);
2104 pkey=s->cert->key->privatekey;
2105
2106 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2107 &(data[MD5_DIGEST_LENGTH]));
2108
2109 #ifndef OPENSSL_NO_RSA
2110 if (pkey->type == EVP_PKEY_RSA)
2111 {
2112 s->method->ssl3_enc->cert_verify_mac(s,
2113 &(s->s3->finish_dgst1),&(data[0]));
2114 if (RSA_sign(NID_md5_sha1, data,
2115 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2116 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2117 {
2118 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2119 goto err;
2120 }
2121 s2n(u,p);
2122 n=u+2;
2123 }
2124 else
2125 #endif
2126 #ifndef OPENSSL_NO_DSA
2127 if (pkey->type == EVP_PKEY_DSA)
2128 {
2129 if (!DSA_sign(pkey->save_type,
2130 &(data[MD5_DIGEST_LENGTH]),
2131 SHA_DIGEST_LENGTH,&(p[2]),
2132 (unsigned int *)&j,pkey->pkey.dsa))
2133 {
2134 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2135 goto err;
2136 }
2137 s2n(j,p);
2138 n=j+2;
2139 }
2140 else
2141 #endif
2142 #ifndef OPENSSL_NO_ECDSA
2143 if (pkey->type == EVP_PKEY_EC)
2144 {
2145 if (!ECDSA_sign(pkey->save_type,
2146 &(data[MD5_DIGEST_LENGTH]),
2147 SHA_DIGEST_LENGTH,&(p[2]),
2148 (unsigned int *)&j,pkey->pkey.eckey))
2149 {
2150 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2151 ERR_R_ECDSA_LIB);
2152 goto err;
2153 }
2154 s2n(j,p);
2155 n=j+2;
2156 }
2157 else
2158 #endif
2159 {
2160 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2161 goto err;
2162 }
2163 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2164 l2n3(n,d);
2165
2166 s->state=SSL3_ST_CW_CERT_VRFY_B;
2167 s->init_num=(int)n+4;
2168 s->init_off=0;
2169 }
2170 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2171 err:
2172 return(-1);
2173 }
2174
2175 static int ssl3_send_client_certificate(SSL *s)
2176 {
2177 X509 *x509=NULL;
2178 EVP_PKEY *pkey=NULL;
2179 int i;
2180 unsigned long l;
2181
2182 if (s->state == SSL3_ST_CW_CERT_A)
2183 {
2184 if ((s->cert == NULL) ||
2185 (s->cert->key->x509 == NULL) ||
2186 (s->cert->key->privatekey == NULL))
2187 s->state=SSL3_ST_CW_CERT_B;
2188 else
2189 s->state=SSL3_ST_CW_CERT_C;
2190 }
2191
2192 /* We need to get a client cert */
2193 if (s->state == SSL3_ST_CW_CERT_B)
2194 {
2195 /* If we get an error, we need to
2196 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2197 * We then get retied later */
2198 i=0;
2199 if (s->ctx->client_cert_cb != NULL)
2200 i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2201 if (i < 0)
2202 {
2203 s->rwstate=SSL_X509_LOOKUP;
2204 return(-1);
2205 }
2206 s->rwstate=SSL_NOTHING;
2207 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2208 {
2209 s->state=SSL3_ST_CW_CERT_B;
2210 if ( !SSL_use_certificate(s,x509) ||
2211 !SSL_use_PrivateKey(s,pkey))
2212 i=0;
2213 }
2214 else if (i == 1)
2215 {
2216 i=0;
2217 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2218 }
2219
2220 if (x509 != NULL) X509_free(x509);
2221 if (pkey != NULL) EVP_PKEY_free(pkey);
2222 if (i == 0)
2223 {
2224 if (s->version == SSL3_VERSION)
2225 {
2226 s->s3->tmp.cert_req=0;
2227 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2228 return(1);
2229 }
2230 else
2231 {
2232 s->s3->tmp.cert_req=2;
2233 }
2234 }
2235
2236 /* Ok, we have a cert */
2237 s->state=SSL3_ST_CW_CERT_C;
2238 }
2239
2240 if (s->state == SSL3_ST_CW_CERT_C)
2241 {
2242 s->state=SSL3_ST_CW_CERT_D;
2243 l=ssl3_output_cert_chain(s,
2244 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2245 s->init_num=(int)l;
2246 s->init_off=0;
2247 }
2248 /* SSL3_ST_CW_CERT_D */
2249 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2250 }
2251
2252 #define has_bits(i,m) (((i)&(m)) == (m))
2253
2254 static int ssl3_check_cert_and_algorithm(SSL *s)
2255 {
2256 int i,idx;
2257 long algs;
2258 EVP_PKEY *pkey=NULL;
2259 SESS_CERT *sc;
2260 #ifndef OPENSSL_NO_RSA
2261 RSA *rsa;
2262 #endif
2263 #ifndef OPENSSL_NO_DH
2264 DH *dh;
2265 #endif
2266
2267 sc=s->session->sess_cert;
2268
2269 if (sc == NULL)
2270 {
2271 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2272 goto err;
2273 }
2274
2275 algs=s->s3->tmp.new_cipher->algorithms;
2276
2277 /* we don't have a certificate */
2278 if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2279 return(1);
2280
2281 #ifndef OPENSSL_NO_RSA
2282 rsa=s->session->sess_cert->peer_rsa_tmp;
2283 #endif
2284 #ifndef OPENSSL_NO_DH
2285 dh=s->session->sess_cert->peer_dh_tmp;
2286 #endif
2287
2288 /* This is the passed certificate */
2289
2290 idx=sc->peer_cert_type;
2291 #ifndef OPENSSL_NO_ECDH
2292 if (idx == SSL_PKEY_ECC)
2293 {
2294 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2295 s->s3->tmp.new_cipher) == 0)
2296 { /* check failed */
2297 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2298 goto f_err;
2299 }
2300 else
2301 {
2302 return 1;
2303 }
2304 }
2305 #endif
2306 pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2307 i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2308 EVP_PKEY_free(pkey);
2309
2310
2311 /* Check that we have a certificate if we require one */
2312 if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2313 {
2314 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2315 goto f_err;
2316 }
2317 #ifndef OPENSSL_NO_DSA
2318 else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2319 {
2320 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2321 goto f_err;
2322 }
2323 #endif
2324 #ifndef OPENSSL_NO_RSA
2325 if ((algs & SSL_kRSA) &&
2326 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2327 {
2328 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2329 goto f_err;
2330 }
2331 #endif
2332 #ifndef OPENSSL_NO_DH
2333 if ((algs & SSL_kEDH) &&
2334 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2335 {
2336 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2337 goto f_err;
2338 }
2339 else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2340 {
2341 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2342 goto f_err;
2343 }
2344 #ifndef OPENSSL_NO_DSA
2345 else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2346 {
2347 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2348 goto f_err;
2349 }
2350 #endif
2351 #endif
2352
2353 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2354 {
2355 #ifndef OPENSSL_NO_RSA
2356 if (algs & SSL_kRSA)
2357 {
2358 if (rsa == NULL
2359 || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2360 {
2361 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2362 goto f_err;
2363 }
2364 }
2365 else
2366 #endif
2367 #ifndef OPENSSL_NO_DH
2368 if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2369 {
2370 if (dh == NULL
2371 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2372 {
2373 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2374 goto f_err;
2375 }
2376 }
2377 else
2378 #endif
2379 {
2380 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2381 goto f_err;
2382 }
2383 }
2384 return(1);
2385 f_err:
2386 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2387 err:
2388 return(0);
2389 }
2390
2391
2392 #ifndef OPENSSL_NO_ECDH
2393 /* This is the complement of nid2curve_id in s3_srvr.c. */
2394 static int curve_id2nid(int curve_id)
2395 {
2396 /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2397 * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2398 static int nid_list[26] =
2399 {
2400 0,
2401 NID_sect163k1, /* sect163k1 (1) */
2402 NID_sect163r1, /* sect163r1 (2) */
2403 NID_sect163r2, /* sect163r2 (3) */
2404 NID_sect193r1, /* sect193r1 (4) */
2405 NID_sect193r2, /* sect193r2 (5) */
2406 NID_sect233k1, /* sect233k1 (6) */
2407 NID_sect233r1, /* sect233r1 (7) */
2408 NID_sect239k1, /* sect239k1 (8) */
2409 NID_sect283k1, /* sect283k1 (9) */
2410 NID_sect283r1, /* sect283r1 (10) */
2411 NID_sect409k1, /* sect409k1 (11) */
2412 NID_sect409r1, /* sect409r1 (12) */
2413 NID_sect571k1, /* sect571k1 (13) */
2414 NID_sect571r1, /* sect571r1 (14) */
2415 NID_secp160k1, /* secp160k1 (15) */
2416 NID_secp160r1, /* secp160r1 (16) */
2417 NID_secp160r2, /* secp160r2 (17) */
2418 NID_secp192k1, /* secp192k1 (18) */
2419 NID_X9_62_prime192v1, /* secp192r1 (19) */
2420 NID_secp224k1, /* secp224k1 (20) */
2421 NID_secp224r1, /* secp224r1 (21) */
2422 NID_secp256k1, /* secp256k1 (22) */
2423 NID_X9_62_prime256v1, /* secp256r1 (23) */
2424 NID_secp384r1, /* secp384r1 (24) */
2425 NID_secp521r1 /* secp521r1 (25) */
2426 };
2427
2428 if ((curve_id < 1) || (curve_id > 25)) return 0;
2429
2430 return nid_list[curve_id];
2431 }
2432 #endif
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