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First tentative impementation of Kerberos 5 cryptos and keys for SSL/TLS. Implemente...
[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 #include <stdio.h>
60 #include <openssl/buffer.h>
61 #include <openssl/rand.h>
62 #include <openssl/objects.h>
63 #include <openssl/md5.h>
64 #include <openssl/sha.h>
65 #include <openssl/evp.h>
66 #include "ssl_locl.h"
67
68 #ifndef NO_KRB5
69 #include "kssl.h"
70 #endif
71
72 static SSL_METHOD *ssl3_get_client_method(int ver);
73 static int ssl3_client_hello(SSL *s);
74 static int ssl3_get_server_hello(SSL *s);
75 static int ssl3_get_certificate_request(SSL *s);
76 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
77 static int ssl3_get_server_done(SSL *s);
78 static int ssl3_send_client_verify(SSL *s);
79 static int ssl3_send_client_certificate(SSL *s);
80 static int ssl3_send_client_key_exchange(SSL *s);
81 static int ssl3_get_key_exchange(SSL *s);
82 static int ssl3_get_server_certificate(SSL *s);
83 static int ssl3_check_cert_and_algorithm(SSL *s);
84 static SSL_METHOD *ssl3_get_client_method(int ver)
85 {
86 if (ver == SSL3_VERSION)
87 return(SSLv3_client_method());
88 else
89 return(NULL);
90 }
91
92 SSL_METHOD *SSLv3_client_method(void)
93 {
94 static int init=1;
95 static SSL_METHOD SSLv3_client_data;
96
97 if (init)
98 {
99 init=0;
100 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
101 sizeof(SSL_METHOD));
102 SSLv3_client_data.ssl_connect=ssl3_connect;
103 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
104 }
105 return(&SSLv3_client_data);
106 }
107
108 int ssl3_connect(SSL *s)
109 {
110 BUF_MEM *buf;
111 unsigned long Time=time(NULL),l;
112 long num1;
113 void (*cb)()=NULL;
114 int ret= -1;
115 int new_state,state,skip=0;;
116
117 RAND_add(&Time,sizeof(Time),0);
118 ERR_clear_error();
119 clear_sys_error();
120
121 if (s->info_callback != NULL)
122 cb=s->info_callback;
123 else if (s->ctx->info_callback != NULL)
124 cb=s->ctx->info_callback;
125
126 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
127 s->in_handshake++;
128
129 for (;;)
130 {
131 state=s->state;
132
133 switch(s->state)
134 {
135 case SSL_ST_RENEGOTIATE:
136 s->new_session=1;
137 s->state=SSL_ST_CONNECT;
138 s->ctx->stats.sess_connect_renegotiate++;
139 /* break */
140 case SSL_ST_BEFORE:
141 case SSL_ST_CONNECT:
142 case SSL_ST_BEFORE|SSL_ST_CONNECT:
143 case SSL_ST_OK|SSL_ST_CONNECT:
144
145 s->server=0;
146 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
147
148 if ((s->version & 0xff00 ) != 0x0300)
149 {
150 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_INTERNAL_ERROR);
151 ret = -1;
152 goto end;
153 }
154
155 /* s->version=SSL3_VERSION; */
156 s->type=SSL_ST_CONNECT;
157
158 if (s->init_buf == NULL)
159 {
160 if ((buf=BUF_MEM_new()) == NULL)
161 {
162 ret= -1;
163 goto end;
164 }
165 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
166 {
167 ret= -1;
168 goto end;
169 }
170 s->init_buf=buf;
171 }
172
173 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
174
175 /* setup buffing BIO */
176 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
177
178 /* don't push the buffering BIO quite yet */
179
180 ssl3_init_finished_mac(s);
181
182 s->state=SSL3_ST_CW_CLNT_HELLO_A;
183 s->ctx->stats.sess_connect++;
184 s->init_num=0;
185 break;
186
187 case SSL3_ST_CW_CLNT_HELLO_A:
188 case SSL3_ST_CW_CLNT_HELLO_B:
189
190 s->shutdown=0;
191 ret=ssl3_client_hello(s);
192 if (ret <= 0) goto end;
193 s->state=SSL3_ST_CR_SRVR_HELLO_A;
194 s->init_num=0;
195
196 /* turn on buffering for the next lot of output */
197 if (s->bbio != s->wbio)
198 s->wbio=BIO_push(s->bbio,s->wbio);
199
200 break;
201
202 case SSL3_ST_CR_SRVR_HELLO_A:
203 case SSL3_ST_CR_SRVR_HELLO_B:
204 ret=ssl3_get_server_hello(s);
205 if (ret <= 0) goto end;
206 if (s->hit)
207 s->state=SSL3_ST_CR_FINISHED_A;
208 else
209 s->state=SSL3_ST_CR_CERT_A;
210 s->init_num=0;
211 break;
212
213 case SSL3_ST_CR_CERT_A:
214 case SSL3_ST_CR_CERT_B:
215 /* Check if it is anon DH */
216 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
217 {
218 ret=ssl3_get_server_certificate(s);
219 if (ret <= 0) goto end;
220 }
221 else
222 skip=1;
223 s->state=SSL3_ST_CR_KEY_EXCH_A;
224 s->init_num=0;
225 break;
226
227 case SSL3_ST_CR_KEY_EXCH_A:
228 case SSL3_ST_CR_KEY_EXCH_B:
229 ret=ssl3_get_key_exchange(s);
230 if (ret <= 0) goto end;
231 s->state=SSL3_ST_CR_CERT_REQ_A;
232 s->init_num=0;
233
234 /* at this point we check that we have the
235 * required stuff from the server */
236 if (!ssl3_check_cert_and_algorithm(s))
237 {
238 ret= -1;
239 goto end;
240 }
241 break;
242
243 case SSL3_ST_CR_CERT_REQ_A:
244 case SSL3_ST_CR_CERT_REQ_B:
245 ret=ssl3_get_certificate_request(s);
246 if (ret <= 0) goto end;
247 s->state=SSL3_ST_CR_SRVR_DONE_A;
248 s->init_num=0;
249 break;
250
251 case SSL3_ST_CR_SRVR_DONE_A:
252 case SSL3_ST_CR_SRVR_DONE_B:
253 ret=ssl3_get_server_done(s);
254 if (ret <= 0) goto end;
255 if (s->s3->tmp.cert_req)
256 s->state=SSL3_ST_CW_CERT_A;
257 else
258 s->state=SSL3_ST_CW_KEY_EXCH_A;
259 s->init_num=0;
260
261 break;
262
263 case SSL3_ST_CW_CERT_A:
264 case SSL3_ST_CW_CERT_B:
265 case SSL3_ST_CW_CERT_C:
266 case SSL3_ST_CW_CERT_D:
267 ret=ssl3_send_client_certificate(s);
268 if (ret <= 0) goto end;
269 s->state=SSL3_ST_CW_KEY_EXCH_A;
270 s->init_num=0;
271 break;
272
273 case SSL3_ST_CW_KEY_EXCH_A:
274 case SSL3_ST_CW_KEY_EXCH_B:
275 ret=ssl3_send_client_key_exchange(s);
276 if (ret <= 0) goto end;
277 l=s->s3->tmp.new_cipher->algorithms;
278 /* EAY EAY EAY need to check for DH fix cert
279 * sent back */
280 /* For TLS, cert_req is set to 2, so a cert chain
281 * of nothing is sent, but no verify packet is sent */
282 if (s->s3->tmp.cert_req == 1)
283 {
284 s->state=SSL3_ST_CW_CERT_VRFY_A;
285 }
286 else
287 {
288 s->state=SSL3_ST_CW_CHANGE_A;
289 s->s3->change_cipher_spec=0;
290 }
291
292 s->init_num=0;
293 break;
294
295 case SSL3_ST_CW_CERT_VRFY_A:
296 case SSL3_ST_CW_CERT_VRFY_B:
297 ret=ssl3_send_client_verify(s);
298 if (ret <= 0) goto end;
299 s->state=SSL3_ST_CW_CHANGE_A;
300 s->init_num=0;
301 s->s3->change_cipher_spec=0;
302 break;
303
304 case SSL3_ST_CW_CHANGE_A:
305 case SSL3_ST_CW_CHANGE_B:
306 ret=ssl3_send_change_cipher_spec(s,
307 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
308 if (ret <= 0) goto end;
309 s->state=SSL3_ST_CW_FINISHED_A;
310 s->init_num=0;
311
312 s->session->cipher=s->s3->tmp.new_cipher;
313 if (s->s3->tmp.new_compression == NULL)
314 s->session->compress_meth=0;
315 else
316 s->session->compress_meth=
317 s->s3->tmp.new_compression->id;
318 if (!s->method->ssl3_enc->setup_key_block(s))
319 {
320 ret= -1;
321 goto end;
322 }
323
324 if (!s->method->ssl3_enc->change_cipher_state(s,
325 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
326 {
327 ret= -1;
328 goto end;
329 }
330
331 break;
332
333 case SSL3_ST_CW_FINISHED_A:
334 case SSL3_ST_CW_FINISHED_B:
335 ret=ssl3_send_finished(s,
336 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
337 s->method->ssl3_enc->client_finished_label,
338 s->method->ssl3_enc->client_finished_label_len);
339 if (ret <= 0) goto end;
340 s->state=SSL3_ST_CW_FLUSH;
341
342 /* clear flags */
343 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
344 if (s->hit)
345 {
346 s->s3->tmp.next_state=SSL_ST_OK;
347 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
348 {
349 s->state=SSL_ST_OK;
350 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
351 s->s3->delay_buf_pop_ret=0;
352 }
353 }
354 else
355 {
356 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
357 }
358 s->init_num=0;
359 break;
360
361 case SSL3_ST_CR_FINISHED_A:
362 case SSL3_ST_CR_FINISHED_B:
363
364 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
365 SSL3_ST_CR_FINISHED_B);
366 if (ret <= 0) goto end;
367
368 if (s->hit)
369 s->state=SSL3_ST_CW_CHANGE_A;
370 else
371 s->state=SSL_ST_OK;
372 s->init_num=0;
373 break;
374
375 case SSL3_ST_CW_FLUSH:
376 /* number of bytes to be flushed */
377 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
378 if (num1 > 0)
379 {
380 s->rwstate=SSL_WRITING;
381 num1=BIO_flush(s->wbio);
382 if (num1 <= 0) { ret= -1; goto end; }
383 s->rwstate=SSL_NOTHING;
384 }
385
386 s->state=s->s3->tmp.next_state;
387 break;
388
389 case SSL_ST_OK:
390 /* clean a few things up */
391 ssl3_cleanup_key_block(s);
392
393 if (s->init_buf != NULL)
394 {
395 BUF_MEM_free(s->init_buf);
396 s->init_buf=NULL;
397 }
398
399 /* If we are not 'joining' the last two packets,
400 * remove the buffering now */
401 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
402 ssl_free_wbio_buffer(s);
403 /* else do it later in ssl3_write */
404
405 s->init_num=0;
406 s->new_session=0;
407
408 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
409 if (s->hit) s->ctx->stats.sess_hit++;
410
411 ret=1;
412 /* s->server=0; */
413 s->handshake_func=ssl3_connect;
414 s->ctx->stats.sess_connect_good++;
415
416 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
417
418 goto end;
419 /* break; */
420
421 default:
422 SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
423 ret= -1;
424 goto end;
425 /* break; */
426 }
427
428 /* did we do anything */
429 if (!s->s3->tmp.reuse_message && !skip)
430 {
431 if (s->debug)
432 {
433 if ((ret=BIO_flush(s->wbio)) <= 0)
434 goto end;
435 }
436
437 if ((cb != NULL) && (s->state != state))
438 {
439 new_state=s->state;
440 s->state=state;
441 cb(s,SSL_CB_CONNECT_LOOP,1);
442 s->state=new_state;
443 }
444 }
445 skip=0;
446 }
447 end:
448 if (cb != NULL)
449 cb(s,SSL_CB_CONNECT_EXIT,ret);
450 s->in_handshake--;
451 return(ret);
452 }
453
454
455 static int ssl3_client_hello(SSL *s)
456 {
457 unsigned char *buf;
458 unsigned char *p,*d;
459 int i,j;
460 unsigned long Time,l;
461 SSL_COMP *comp;
462
463 buf=(unsigned char *)s->init_buf->data;
464 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
465 {
466 if ((s->session == NULL) ||
467 (s->session->ssl_version != s->version) ||
468 (s->session->not_resumable))
469 {
470 if (!ssl_get_new_session(s,0))
471 goto err;
472 }
473 /* else use the pre-loaded session */
474
475 p=s->s3->client_random;
476 Time=time(NULL); /* Time */
477 l2n(Time,p);
478 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
479
480 /* Do the message type and length last */
481 d=p= &(buf[4]);
482
483 *(p++)=s->version>>8;
484 *(p++)=s->version&0xff;
485 s->client_version=s->version;
486
487 /* Random stuff */
488 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
489 p+=SSL3_RANDOM_SIZE;
490
491 /* Session ID */
492 if (s->new_session)
493 i=0;
494 else
495 i=s->session->session_id_length;
496 *(p++)=i;
497 if (i != 0)
498 {
499 memcpy(p,s->session->session_id,i);
500 p+=i;
501 }
502
503 /* Ciphers supported */
504 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
505 if (i == 0)
506 {
507 SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
508 goto err;
509 }
510 s2n(i,p);
511 p+=i;
512
513 /* COMPRESSION */
514 if (s->ctx->comp_methods == NULL)
515 j=0;
516 else
517 j=sk_SSL_COMP_num(s->ctx->comp_methods);
518 *(p++)=1+j;
519 for (i=0; i<j; i++)
520 {
521 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
522 *(p++)=comp->id;
523 }
524 *(p++)=0; /* Add the NULL method */
525
526 l=(p-d);
527 d=buf;
528 *(d++)=SSL3_MT_CLIENT_HELLO;
529 l2n3(l,d);
530
531 s->state=SSL3_ST_CW_CLNT_HELLO_B;
532 /* number of bytes to write */
533 s->init_num=p-buf;
534 s->init_off=0;
535 }
536
537 /* SSL3_ST_CW_CLNT_HELLO_B */
538 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
539 err:
540 return(-1);
541 }
542
543 static int ssl3_get_server_hello(SSL *s)
544 {
545 STACK_OF(SSL_CIPHER) *sk;
546 SSL_CIPHER *c;
547 unsigned char *p,*d;
548 int i,al,ok;
549 unsigned int j;
550 long n;
551 SSL_COMP *comp;
552
553 n=ssl3_get_message(s,
554 SSL3_ST_CR_SRVR_HELLO_A,
555 SSL3_ST_CR_SRVR_HELLO_B,
556 SSL3_MT_SERVER_HELLO,
557 300, /* ?? */
558 &ok);
559
560 if (!ok) return((int)n);
561 d=p=(unsigned char *)s->init_buf->data;
562
563 if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
564 {
565 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
566 s->version=(s->version&0xff00)|p[1];
567 al=SSL_AD_PROTOCOL_VERSION;
568 goto f_err;
569 }
570 p+=2;
571
572 /* load the server hello data */
573 /* load the server random */
574 memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
575 p+=SSL3_RANDOM_SIZE;
576
577 /* get the session-id */
578 j= *(p++);
579
580 if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
581 {
582 /* SSLref returns 16 :-( */
583 if (j < SSL2_SSL_SESSION_ID_LENGTH)
584 {
585 al=SSL_AD_ILLEGAL_PARAMETER;
586 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
587 goto f_err;
588 }
589 }
590 if (j != 0 && j == s->session->session_id_length
591 && memcmp(p,s->session->session_id,j) == 0)
592 {
593 if(s->sid_ctx_length != s->session->sid_ctx_length
594 || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
595 {
596 al=SSL_AD_ILLEGAL_PARAMETER;
597 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
598 goto f_err;
599 }
600 s->hit=1;
601 }
602 else /* a miss or crap from the other end */
603 {
604 /* If we were trying for session-id reuse, make a new
605 * SSL_SESSION so we don't stuff up other people */
606 s->hit=0;
607 if (s->session->session_id_length > 0)
608 {
609 if (!ssl_get_new_session(s,0))
610 {
611 al=SSL_AD_INTERNAL_ERROR;
612 goto f_err;
613 }
614 }
615 s->session->session_id_length=j;
616 memcpy(s->session->session_id,p,j); /* j could be 0 */
617 }
618 p+=j;
619 c=ssl_get_cipher_by_char(s,p);
620 if (c == NULL)
621 {
622 /* unknown cipher */
623 al=SSL_AD_ILLEGAL_PARAMETER;
624 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
625 goto f_err;
626 }
627 p+=ssl_put_cipher_by_char(s,NULL,NULL);
628
629 sk=ssl_get_ciphers_by_id(s);
630 i=sk_SSL_CIPHER_find(sk,c);
631 if (i < 0)
632 {
633 /* we did not say we would use this cipher */
634 al=SSL_AD_ILLEGAL_PARAMETER;
635 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
636 goto f_err;
637 }
638
639 if (s->hit && (s->session->cipher != c))
640 {
641 if (!(s->options &
642 SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
643 {
644 al=SSL_AD_ILLEGAL_PARAMETER;
645 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
646 goto f_err;
647 }
648 }
649 s->s3->tmp.new_cipher=c;
650
651 /* lets get the compression algorithm */
652 /* COMPRESSION */
653 j= *(p++);
654 if (j == 0)
655 comp=NULL;
656 else
657 comp=ssl3_comp_find(s->ctx->comp_methods,j);
658
659 if ((j != 0) && (comp == NULL))
660 {
661 al=SSL_AD_ILLEGAL_PARAMETER;
662 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
663 goto f_err;
664 }
665 else
666 {
667 s->s3->tmp.new_compression=comp;
668 }
669
670 if (p != (d+n))
671 {
672 /* wrong packet length */
673 al=SSL_AD_DECODE_ERROR;
674 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
675 goto err;
676 }
677
678 return(1);
679 f_err:
680 ssl3_send_alert(s,SSL3_AL_FATAL,al);
681 err:
682 return(-1);
683 }
684
685 static int ssl3_get_server_certificate(SSL *s)
686 {
687 int al,i,ok,ret= -1;
688 unsigned long n,nc,llen,l;
689 X509 *x=NULL;
690 unsigned char *p,*d,*q;
691 STACK_OF(X509) *sk=NULL;
692 SESS_CERT *sc;
693 EVP_PKEY *pkey=NULL;
694 int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
695
696 n=ssl3_get_message(s,
697 SSL3_ST_CR_CERT_A,
698 SSL3_ST_CR_CERT_B,
699 -1,
700 #if defined(MSDOS) && !defined(WIN32)
701 1024*30, /* 30k max cert list :-) */
702 #else
703 1024*100, /* 100k max cert list :-) */
704 #endif
705 &ok);
706
707 if (!ok) return((int)n);
708
709 if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
710 {
711 s->s3->tmp.reuse_message=1;
712 return(1);
713 }
714
715 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
716 {
717 al=SSL_AD_UNEXPECTED_MESSAGE;
718 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
719 goto f_err;
720 }
721 d=p=(unsigned char *)s->init_buf->data;
722
723 if ((sk=sk_X509_new_null()) == NULL)
724 {
725 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
726 goto err;
727 }
728
729 n2l3(p,llen);
730 if (llen+3 != n)
731 {
732 al=SSL_AD_DECODE_ERROR;
733 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
734 goto f_err;
735 }
736 for (nc=0; nc<llen; )
737 {
738 n2l3(p,l);
739 if ((l+nc+3) > llen)
740 {
741 al=SSL_AD_DECODE_ERROR;
742 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
743 goto f_err;
744 }
745
746 q=p;
747 x=d2i_X509(NULL,&q,l);
748 if (x == NULL)
749 {
750 al=SSL_AD_BAD_CERTIFICATE;
751 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
752 goto f_err;
753 }
754 if (q != (p+l))
755 {
756 al=SSL_AD_DECODE_ERROR;
757 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
758 goto f_err;
759 }
760 if (!sk_X509_push(sk,x))
761 {
762 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
763 goto err;
764 }
765 x=NULL;
766 nc+=l+3;
767 p=q;
768 }
769
770 i=ssl_verify_cert_chain(s,sk);
771 if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
772 {
773 al=ssl_verify_alarm_type(s->verify_result);
774 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
775 goto f_err;
776 }
777 ERR_clear_error(); /* but we keep s->verify_result */
778
779 sc=ssl_sess_cert_new();
780 if (sc == NULL) goto err;
781
782 if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
783 s->session->sess_cert=sc;
784
785 sc->cert_chain=sk;
786 /* Inconsistency alert: cert_chain does include the peer's
787 * certificate, which we don't include in s3_srvr.c */
788 x=sk_X509_value(sk,0);
789 sk=NULL;
790 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end */
791
792 pkey=X509_get_pubkey(x);
793
794 /* VRS: allow null cert if auth == KRB5 */
795 need_cert =
796 ((s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
797 == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
798
799 #ifdef KSSL_DEBUG
800 printf("pkey,x = %p, %p\n", pkey,x);
801 printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
802 printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
803 s->s3->tmp.new_cipher->algorithms, need_cert);
804 #endif /* KSSL_DEBUG */
805
806 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
807 {
808 x=NULL;
809 al=SSL3_AL_FATAL;
810 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
811 goto f_err;
812 }
813
814 i=ssl_cert_type(x,pkey);
815 if (need_cert && i < 0)
816 {
817 x=NULL;
818 al=SSL3_AL_FATAL;
819 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
820 goto f_err;
821 }
822
823 if (need_cert)
824 {
825 sc->peer_cert_type=i;
826 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
827 /* Why would the following ever happen?
828 * We just created sc a couple of lines ago. */
829 if (sc->peer_pkeys[i].x509 != NULL)
830 X509_free(sc->peer_pkeys[i].x509);
831 sc->peer_pkeys[i].x509=x;
832 sc->peer_key= &(sc->peer_pkeys[i]);
833
834 if (s->session->peer != NULL)
835 X509_free(s->session->peer);
836 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
837 s->session->peer=x;
838 }
839 else
840 {
841 sc->peer_cert_type=i;
842 sc->peer_key= NULL;
843
844 if (s->session->peer != NULL)
845 X509_free(s->session->peer);
846 s->session->peer=NULL;
847 }
848 s->session->verify_result = s->verify_result;
849
850 x=NULL;
851 ret=1;
852
853 if (0)
854 {
855 f_err:
856 ssl3_send_alert(s,SSL3_AL_FATAL,al);
857 }
858 err:
859 EVP_PKEY_free(pkey);
860 X509_free(x);
861 sk_X509_pop_free(sk,X509_free);
862 return(ret);
863 }
864
865 static int ssl3_get_key_exchange(SSL *s)
866 {
867 #ifndef NO_RSA
868 unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
869 #endif
870 EVP_MD_CTX md_ctx;
871 unsigned char *param,*p;
872 int al,i,j,param_len,ok;
873 long n,alg;
874 EVP_PKEY *pkey=NULL;
875 #ifndef NO_RSA
876 RSA *rsa=NULL;
877 #endif
878 #ifndef NO_DH
879 DH *dh=NULL;
880 #endif
881
882 n=ssl3_get_message(s,
883 SSL3_ST_CR_KEY_EXCH_A,
884 SSL3_ST_CR_KEY_EXCH_B,
885 -1,
886 1024*8, /* ?? */
887 &ok);
888
889 if (!ok) return((int)n);
890
891 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
892 {
893 s->s3->tmp.reuse_message=1;
894 return(1);
895 }
896
897 param=p=(unsigned char *)s->init_buf->data;
898
899 if (s->session->sess_cert != NULL)
900 {
901 #ifndef NO_RSA
902 if (s->session->sess_cert->peer_rsa_tmp != NULL)
903 {
904 RSA_free(s->session->sess_cert->peer_rsa_tmp);
905 s->session->sess_cert->peer_rsa_tmp=NULL;
906 }
907 #endif
908 #ifndef NO_DH
909 if (s->session->sess_cert->peer_dh_tmp)
910 {
911 DH_free(s->session->sess_cert->peer_dh_tmp);
912 s->session->sess_cert->peer_dh_tmp=NULL;
913 }
914 #endif
915 }
916 else
917 {
918 s->session->sess_cert=ssl_sess_cert_new();
919 }
920
921 param_len=0;
922 alg=s->s3->tmp.new_cipher->algorithms;
923
924 #ifndef NO_RSA
925 if (alg & SSL_kRSA)
926 {
927 if ((rsa=RSA_new()) == NULL)
928 {
929 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
930 goto err;
931 }
932 n2s(p,i);
933 param_len=i+2;
934 if (param_len > n)
935 {
936 al=SSL_AD_DECODE_ERROR;
937 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
938 goto f_err;
939 }
940 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
941 {
942 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
943 goto err;
944 }
945 p+=i;
946
947 n2s(p,i);
948 param_len+=i+2;
949 if (param_len > n)
950 {
951 al=SSL_AD_DECODE_ERROR;
952 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
953 goto f_err;
954 }
955 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
956 {
957 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
958 goto err;
959 }
960 p+=i;
961 n-=param_len;
962
963 /* this should be because we are using an export cipher */
964 if (alg & SSL_aRSA)
965 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
966 else
967 {
968 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
969 goto err;
970 }
971 s->session->sess_cert->peer_rsa_tmp=rsa;
972 rsa=NULL;
973 }
974 #else /* NO_RSA */
975 if (0)
976 ;
977 #endif
978 #ifndef NO_DH
979 else if (alg & SSL_kEDH)
980 {
981 if ((dh=DH_new()) == NULL)
982 {
983 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
984 goto err;
985 }
986 n2s(p,i);
987 param_len=i+2;
988 if (param_len > n)
989 {
990 al=SSL_AD_DECODE_ERROR;
991 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
992 goto f_err;
993 }
994 if (!(dh->p=BN_bin2bn(p,i,NULL)))
995 {
996 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
997 goto err;
998 }
999 p+=i;
1000
1001 n2s(p,i);
1002 param_len+=i+2;
1003 if (param_len > n)
1004 {
1005 al=SSL_AD_DECODE_ERROR;
1006 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1007 goto f_err;
1008 }
1009 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1010 {
1011 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1012 goto err;
1013 }
1014 p+=i;
1015
1016 n2s(p,i);
1017 param_len+=i+2;
1018 if (param_len > n)
1019 {
1020 al=SSL_AD_DECODE_ERROR;
1021 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1022 goto f_err;
1023 }
1024 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1025 {
1026 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1027 goto err;
1028 }
1029 p+=i;
1030 n-=param_len;
1031
1032 #ifndef NO_RSA
1033 if (alg & SSL_aRSA)
1034 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1035 #else
1036 if (0)
1037 ;
1038 #endif
1039 #ifndef NO_DSA
1040 else if (alg & SSL_aDSS)
1041 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1042 #endif
1043 /* else anonymous DH, so no certificate or pkey. */
1044
1045 s->session->sess_cert->peer_dh_tmp=dh;
1046 dh=NULL;
1047 }
1048 else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1049 {
1050 al=SSL_AD_ILLEGAL_PARAMETER;
1051 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1052 goto f_err;
1053 }
1054 #endif /* !NO_DH */
1055 if (alg & SSL_aFZA)
1056 {
1057 al=SSL_AD_HANDSHAKE_FAILURE;
1058 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1059 goto f_err;
1060 }
1061
1062
1063 /* p points to the next byte, there are 'n' bytes left */
1064
1065
1066 /* if it was signed, check the signature */
1067 if (pkey != NULL)
1068 {
1069 n2s(p,i);
1070 n-=2;
1071 j=EVP_PKEY_size(pkey);
1072
1073 if ((i != n) || (n > j) || (n <= 0))
1074 {
1075 /* wrong packet length */
1076 al=SSL_AD_DECODE_ERROR;
1077 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1078 goto f_err;
1079 }
1080
1081 #ifndef NO_RSA
1082 if (pkey->type == EVP_PKEY_RSA)
1083 {
1084 int num;
1085
1086 j=0;
1087 q=md_buf;
1088 for (num=2; num > 0; num--)
1089 {
1090 EVP_DigestInit(&md_ctx,(num == 2)
1091 ?s->ctx->md5:s->ctx->sha1);
1092 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1093 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1094 EVP_DigestUpdate(&md_ctx,param,param_len);
1095 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1096 q+=i;
1097 j+=i;
1098 }
1099 i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1100 pkey->pkey.rsa);
1101 if (i < 0)
1102 {
1103 al=SSL_AD_DECRYPT_ERROR;
1104 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1105 goto f_err;
1106 }
1107 if (i == 0)
1108 {
1109 /* bad signature */
1110 al=SSL_AD_DECRYPT_ERROR;
1111 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1112 goto f_err;
1113 }
1114 }
1115 else
1116 #endif
1117 #ifndef NO_DSA
1118 if (pkey->type == EVP_PKEY_DSA)
1119 {
1120 /* lets do DSS */
1121 EVP_VerifyInit(&md_ctx,EVP_dss1());
1122 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1123 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1124 EVP_VerifyUpdate(&md_ctx,param,param_len);
1125 if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1126 {
1127 /* bad signature */
1128 al=SSL_AD_DECRYPT_ERROR;
1129 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1130 goto f_err;
1131 }
1132 }
1133 else
1134 #endif
1135 {
1136 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1137 goto err;
1138 }
1139 }
1140 else
1141 {
1142 /* still data left over */
1143 if (!(alg & SSL_aNULL))
1144 {
1145 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1146 goto err;
1147 }
1148 if (n != 0)
1149 {
1150 al=SSL_AD_DECODE_ERROR;
1151 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1152 goto f_err;
1153 }
1154 }
1155 EVP_PKEY_free(pkey);
1156 return(1);
1157 f_err:
1158 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1159 err:
1160 EVP_PKEY_free(pkey);
1161 #ifndef NO_RSA
1162 if (rsa != NULL)
1163 RSA_free(rsa);
1164 #endif
1165 #ifndef NO_DH
1166 if (dh != NULL)
1167 DH_free(dh);
1168 #endif
1169 return(-1);
1170 }
1171
1172 static int ssl3_get_certificate_request(SSL *s)
1173 {
1174 int ok,ret=0;
1175 unsigned long n,nc,l;
1176 unsigned int llen,ctype_num,i;
1177 X509_NAME *xn=NULL;
1178 unsigned char *p,*d,*q;
1179 STACK_OF(X509_NAME) *ca_sk=NULL;
1180
1181 n=ssl3_get_message(s,
1182 SSL3_ST_CR_CERT_REQ_A,
1183 SSL3_ST_CR_CERT_REQ_B,
1184 -1,
1185 #if defined(MSDOS) && !defined(WIN32)
1186 1024*30, /* 30k max cert list :-) */
1187 #else
1188 1024*100, /* 100k max cert list :-) */
1189 #endif
1190 &ok);
1191
1192 if (!ok) return((int)n);
1193
1194 s->s3->tmp.cert_req=0;
1195
1196 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1197 {
1198 s->s3->tmp.reuse_message=1;
1199 return(1);
1200 }
1201
1202 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1203 {
1204 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1205 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1206 goto err;
1207 }
1208
1209 /* TLS does not like anon-DH with client cert */
1210 if (s->version > SSL3_VERSION)
1211 {
1212 l=s->s3->tmp.new_cipher->algorithms;
1213 if (l & SSL_aNULL)
1214 {
1215 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1216 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1217 goto err;
1218 }
1219 }
1220
1221 d=p=(unsigned char *)s->init_buf->data;
1222
1223 if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1224 {
1225 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1226 goto err;
1227 }
1228
1229 /* get the certificate types */
1230 ctype_num= *(p++);
1231 if (ctype_num > SSL3_CT_NUMBER)
1232 ctype_num=SSL3_CT_NUMBER;
1233 for (i=0; i<ctype_num; i++)
1234 s->s3->tmp.ctype[i]= p[i];
1235 p+=ctype_num;
1236
1237 /* get the CA RDNs */
1238 n2s(p,llen);
1239 #if 0
1240 {
1241 FILE *out;
1242 out=fopen("/tmp/vsign.der","w");
1243 fwrite(p,1,llen,out);
1244 fclose(out);
1245 }
1246 #endif
1247
1248 if ((llen+ctype_num+2+1) != n)
1249 {
1250 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1251 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1252 goto err;
1253 }
1254
1255 for (nc=0; nc<llen; )
1256 {
1257 n2s(p,l);
1258 if ((l+nc+2) > llen)
1259 {
1260 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1261 goto cont; /* netscape bugs */
1262 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1263 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1264 goto err;
1265 }
1266
1267 q=p;
1268
1269 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1270 {
1271 /* If netscape tolerance is on, ignore errors */
1272 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1273 goto cont;
1274 else
1275 {
1276 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1277 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1278 goto err;
1279 }
1280 }
1281
1282 if (q != (p+l))
1283 {
1284 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1285 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1286 goto err;
1287 }
1288 if (!sk_X509_NAME_push(ca_sk,xn))
1289 {
1290 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1291 goto err;
1292 }
1293
1294 p+=l;
1295 nc+=l+2;
1296 }
1297
1298 if (0)
1299 {
1300 cont:
1301 ERR_clear_error();
1302 }
1303
1304 /* we should setup a certificate to return.... */
1305 s->s3->tmp.cert_req=1;
1306 s->s3->tmp.ctype_num=ctype_num;
1307 if (s->s3->tmp.ca_names != NULL)
1308 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1309 s->s3->tmp.ca_names=ca_sk;
1310 ca_sk=NULL;
1311
1312 ret=1;
1313 err:
1314 if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1315 return(ret);
1316 }
1317
1318 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1319 {
1320 return(X509_NAME_cmp(*a,*b));
1321 }
1322
1323 static int ssl3_get_server_done(SSL *s)
1324 {
1325 int ok,ret=0;
1326 long n;
1327
1328 n=ssl3_get_message(s,
1329 SSL3_ST_CR_SRVR_DONE_A,
1330 SSL3_ST_CR_SRVR_DONE_B,
1331 SSL3_MT_SERVER_DONE,
1332 30, /* should be very small, like 0 :-) */
1333 &ok);
1334
1335 if (!ok) return((int)n);
1336 if (n > 0)
1337 {
1338 /* should contain no data */
1339 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1340 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1341 }
1342 ret=1;
1343 return(ret);
1344 }
1345
1346 static int ssl3_send_client_key_exchange(SSL *s)
1347 {
1348 unsigned char *p,*d;
1349 int n;
1350 unsigned long l;
1351 #ifndef NO_RSA
1352 unsigned char *q;
1353 EVP_PKEY *pkey=NULL;
1354 #endif
1355 #ifndef NO_KRB5
1356 KSSL_ERR kssl_err;
1357 #endif /* NO_KRB5 */
1358
1359 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1360 {
1361 d=(unsigned char *)s->init_buf->data;
1362 p= &(d[4]);
1363
1364 l=s->s3->tmp.new_cipher->algorithms;
1365
1366 /* Fool emacs indentation */
1367 if (0) {}
1368 #ifndef NO_RSA
1369 else if (l & SSL_kRSA)
1370 {
1371 RSA *rsa;
1372 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1373
1374 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1375 rsa=s->session->sess_cert->peer_rsa_tmp;
1376 else
1377 {
1378 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1379 if ((pkey == NULL) ||
1380 (pkey->type != EVP_PKEY_RSA) ||
1381 (pkey->pkey.rsa == NULL))
1382 {
1383 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1384 goto err;
1385 }
1386 rsa=pkey->pkey.rsa;
1387 EVP_PKEY_free(pkey);
1388 }
1389
1390 tmp_buf[0]=s->client_version>>8;
1391 tmp_buf[1]=s->client_version&0xff;
1392 if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1393 goto err;
1394
1395 s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1396
1397 q=p;
1398 /* Fix buf for TLS and beyond */
1399 if (s->version > SSL3_VERSION)
1400 p+=2;
1401 n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1402 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1403 #ifdef PKCS1_CHECK
1404 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1405 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1406 #endif
1407 if (n <= 0)
1408 {
1409 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1410 goto err;
1411 }
1412
1413 /* Fix buf for TLS and beyond */
1414 if (s->version > SSL3_VERSION)
1415 {
1416 s2n(n,q);
1417 n+=2;
1418 }
1419
1420 s->session->master_key_length=
1421 s->method->ssl3_enc->generate_master_secret(s,
1422 s->session->master_key,
1423 tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1424 memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1425 }
1426 #endif
1427 #ifndef NO_KRB5
1428 else if (l & SSL_kKRB5)
1429 {
1430 krb5_error_code krb5rc;
1431 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1432 krb5_data krb5_ap_req;
1433
1434 #ifdef KSSL_DEBUG
1435 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1436 l, SSL_kKRB5);
1437 #endif /* KSSL_DEBUG */
1438
1439 /*
1440 ** Tried to send random tmp_buf[] as PMS in Kerberos ticket
1441 ** by passing krb5_mk_req_extended(ctx,authctx,opts, tmp_buf, ...)
1442 ** but: I can't retrieve the PMS on the other side! There is
1443 ** some indication in the krb5 source that this is only used
1444 ** to generate a checksum. OTOH, the Tung book shows data
1445 ** ("GET widget01.txt") being passed in krb5_mk_req_extended()
1446 ** by way of krb5_sendauth(). I don't get it.
1447 ** Until Kerberos goes 3DES, the big PMS secret would only be
1448 ** encrypted in 1-DES anyway. So losing the PMS shouldn't be
1449 ** a big deal.
1450 */
1451 krb5rc = kssl_cget_tkt(kssl_ctx, &krb5_ap_req,
1452 &kssl_err);
1453 #ifdef KSSL_DEBUG
1454 {
1455 printf("kssl_cget_tkt rtn %d\n", krb5rc);
1456 kssl_ctx_show(kssl_ctx);
1457 if (krb5rc && kssl_err.text)
1458 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1459 }
1460 #endif /* KSSL_DEBUG */
1461
1462 if (krb5rc)
1463 {
1464 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1465 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
1466 goto err;
1467 }
1468
1469 /* Send ticket (copy to *p, set n = length)
1470 */
1471 n = krb5_ap_req.length;
1472 memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1473 if (krb5_ap_req.data)
1474 kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1475
1476 /* 19991013 VRS - 3DES is kind of bogus here,
1477 ** at least until Kerberos supports 3DES. The only
1478 ** real secret is the 8-byte Kerberos session key;
1479 ** the other key material ((s->) client_random, server_random)
1480 ** could be sniffed. Mixing in these nonces should help
1481 ** protect against replay attacks, however.
1482 **
1483 ** Alternate code for Kerberos Purists:
1484 **
1485 ** memcpy(s->session->master_key, kssl_ctx->key, kssl_ctx->length);
1486 ** s->session->master_key_length = kssl_ctx->length;
1487 */
1488 s->session->master_key_length=
1489 s->method->ssl3_enc->generate_master_secret(s,
1490 s->session->master_key, kssl_ctx->key,kssl_ctx->length);
1491 }
1492 #endif
1493 #ifndef NO_DH
1494 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1495 {
1496 DH *dh_srvr,*dh_clnt;
1497
1498 if (s->session->sess_cert->peer_dh_tmp != NULL)
1499 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1500 else
1501 {
1502 /* we get them from the cert */
1503 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1504 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1505 goto err;
1506 }
1507
1508 /* generate a new random key */
1509 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1510 {
1511 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1512 goto err;
1513 }
1514 if (!DH_generate_key(dh_clnt))
1515 {
1516 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1517 goto err;
1518 }
1519
1520 /* use the 'p' output buffer for the DH key, but
1521 * make sure to clear it out afterwards */
1522
1523 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1524
1525 if (n <= 0)
1526 {
1527 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1528 goto err;
1529 }
1530
1531 /* generate master key from the result */
1532 s->session->master_key_length=
1533 s->method->ssl3_enc->generate_master_secret(s,
1534 s->session->master_key,p,n);
1535 /* clean up */
1536 memset(p,0,n);
1537
1538 /* send off the data */
1539 n=BN_num_bytes(dh_clnt->pub_key);
1540 s2n(n,p);
1541 BN_bn2bin(dh_clnt->pub_key,p);
1542 n+=2;
1543
1544 DH_free(dh_clnt);
1545
1546 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1547 }
1548 #endif
1549 else
1550 {
1551 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1552 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1553 goto err;
1554 }
1555
1556 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1557 l2n3(n,d);
1558
1559 s->state=SSL3_ST_CW_KEY_EXCH_B;
1560 /* number of bytes to write */
1561 s->init_num=n+4;
1562 s->init_off=0;
1563 }
1564
1565 /* SSL3_ST_CW_KEY_EXCH_B */
1566 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1567 err:
1568 return(-1);
1569 }
1570
1571 static int ssl3_send_client_verify(SSL *s)
1572 {
1573 unsigned char *p,*d;
1574 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1575 EVP_PKEY *pkey;
1576 #ifndef NO_RSA
1577 unsigned u=0;
1578 #endif
1579 unsigned long n;
1580 #ifndef NO_DSA
1581 int j;
1582 #endif
1583
1584 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1585 {
1586 d=(unsigned char *)s->init_buf->data;
1587 p= &(d[4]);
1588 pkey=s->cert->key->privatekey;
1589
1590 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1591 &(data[MD5_DIGEST_LENGTH]));
1592
1593 #ifndef NO_RSA
1594 if (pkey->type == EVP_PKEY_RSA)
1595 {
1596 s->method->ssl3_enc->cert_verify_mac(s,
1597 &(s->s3->finish_dgst1),&(data[0]));
1598 if (RSA_sign(NID_md5_sha1, data,
1599 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1600 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1601 {
1602 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1603 goto err;
1604 }
1605 s2n(u,p);
1606 n=u+2;
1607 }
1608 else
1609 #endif
1610 #ifndef NO_DSA
1611 if (pkey->type == EVP_PKEY_DSA)
1612 {
1613 if (!DSA_sign(pkey->save_type,
1614 &(data[MD5_DIGEST_LENGTH]),
1615 SHA_DIGEST_LENGTH,&(p[2]),
1616 (unsigned int *)&j,pkey->pkey.dsa))
1617 {
1618 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1619 goto err;
1620 }
1621 s2n(j,p);
1622 n=j+2;
1623 }
1624 else
1625 #endif
1626 {
1627 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,SSL_R_INTERNAL_ERROR);
1628 goto err;
1629 }
1630 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1631 l2n3(n,d);
1632
1633 s->init_num=(int)n+4;
1634 s->init_off=0;
1635 }
1636 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1637 err:
1638 return(-1);
1639 }
1640
1641 static int ssl3_send_client_certificate(SSL *s)
1642 {
1643 X509 *x509=NULL;
1644 EVP_PKEY *pkey=NULL;
1645 int i;
1646 unsigned long l;
1647
1648 if (s->state == SSL3_ST_CW_CERT_A)
1649 {
1650 if ((s->cert == NULL) ||
1651 (s->cert->key->x509 == NULL) ||
1652 (s->cert->key->privatekey == NULL))
1653 s->state=SSL3_ST_CW_CERT_B;
1654 else
1655 s->state=SSL3_ST_CW_CERT_C;
1656 }
1657
1658 /* We need to get a client cert */
1659 if (s->state == SSL3_ST_CW_CERT_B)
1660 {
1661 /* If we get an error, we need to
1662 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1663 * We then get retied later */
1664 i=0;
1665 if (s->ctx->client_cert_cb != NULL)
1666 i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1667 if (i < 0)
1668 {
1669 s->rwstate=SSL_X509_LOOKUP;
1670 return(-1);
1671 }
1672 s->rwstate=SSL_NOTHING;
1673 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1674 {
1675 s->state=SSL3_ST_CW_CERT_B;
1676 if ( !SSL_use_certificate(s,x509) ||
1677 !SSL_use_PrivateKey(s,pkey))
1678 i=0;
1679 }
1680 else if (i == 1)
1681 {
1682 i=0;
1683 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1684 }
1685
1686 if (x509 != NULL) X509_free(x509);
1687 if (pkey != NULL) EVP_PKEY_free(pkey);
1688 if (i == 0)
1689 {
1690 if (s->version == SSL3_VERSION)
1691 {
1692 s->s3->tmp.cert_req=0;
1693 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1694 return(1);
1695 }
1696 else
1697 {
1698 s->s3->tmp.cert_req=2;
1699 }
1700 }
1701
1702 /* Ok, we have a cert */
1703 s->state=SSL3_ST_CW_CERT_C;
1704 }
1705
1706 if (s->state == SSL3_ST_CW_CERT_C)
1707 {
1708 s->state=SSL3_ST_CW_CERT_D;
1709 l=ssl3_output_cert_chain(s,
1710 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1711 s->init_num=(int)l;
1712 s->init_off=0;
1713 }
1714 /* SSL3_ST_CW_CERT_D */
1715 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1716 }
1717
1718 #define has_bits(i,m) (((i)&(m)) == (m))
1719
1720 static int ssl3_check_cert_and_algorithm(SSL *s)
1721 {
1722 int i,idx;
1723 long algs;
1724 EVP_PKEY *pkey=NULL;
1725 SESS_CERT *sc;
1726 #ifndef NO_RSA
1727 RSA *rsa;
1728 #endif
1729 #ifndef NO_DH
1730 DH *dh;
1731 #endif
1732
1733 sc=s->session->sess_cert;
1734
1735 if (sc == NULL)
1736 {
1737 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_INTERNAL_ERROR);
1738 goto err;
1739 }
1740
1741 algs=s->s3->tmp.new_cipher->algorithms;
1742
1743 /* we don't have a certificate */
1744 if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
1745 return(1);
1746
1747 #ifndef NO_RSA
1748 rsa=s->session->sess_cert->peer_rsa_tmp;
1749 #endif
1750 #ifndef NO_DH
1751 dh=s->session->sess_cert->peer_dh_tmp;
1752 #endif
1753
1754 /* This is the passed certificate */
1755
1756 idx=sc->peer_cert_type;
1757 pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1758 i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1759 EVP_PKEY_free(pkey);
1760
1761
1762 /* Check that we have a certificate if we require one */
1763 if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1764 {
1765 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1766 goto f_err;
1767 }
1768 #ifndef NO_DSA
1769 else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1770 {
1771 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1772 goto f_err;
1773 }
1774 #endif
1775 #ifndef NO_RSA
1776 if ((algs & SSL_kRSA) &&
1777 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1778 {
1779 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1780 goto f_err;
1781 }
1782 #endif
1783 #ifndef NO_DH
1784 if ((algs & SSL_kEDH) &&
1785 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1786 {
1787 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1788 goto f_err;
1789 }
1790 else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1791 {
1792 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1793 goto f_err;
1794 }
1795 #ifndef NO_DSA
1796 else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1797 {
1798 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1799 goto f_err;
1800 }
1801 #endif
1802 #endif
1803
1804 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1805 {
1806 #ifndef NO_RSA
1807 if (algs & SSL_kRSA)
1808 {
1809 if (rsa == NULL
1810 || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1811 {
1812 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1813 goto f_err;
1814 }
1815 }
1816 else
1817 #endif
1818 #ifndef NO_DH
1819 if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1820 {
1821 if (dh == NULL
1822 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1823 {
1824 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1825 goto f_err;
1826 }
1827 }
1828 else
1829 #endif
1830 {
1831 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1832 goto f_err;
1833 }
1834 }
1835 return(1);
1836 f_err:
1837 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1838 err:
1839 return(0);
1840 }
1841
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