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-rw-r--r--src/lib/libssl/s3_srvr.c1740
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diff --git a/src/lib/libssl/s3_srvr.c b/src/lib/libssl/s3_srvr.c
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1/* ssl/s3_srvr.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#define REUSE_CIPHER_BUG
60#define NETSCAPE_HANG_BUG
61
62
63#include <stdio.h>
64#include <openssl/buffer.h>
65#include <openssl/rand.h>
66#include <openssl/objects.h>
67#include <openssl/md5.h>
68#include <openssl/sha.h>
69#include <openssl/evp.h>
70#include <openssl/x509.h>
71#include "ssl_locl.h"
72
73static SSL_METHOD *ssl3_get_server_method(int ver);
74static int ssl3_get_client_hello(SSL *s);
75static int ssl3_check_client_hello(SSL *s);
76static int ssl3_send_server_hello(SSL *s);
77static int ssl3_send_server_key_exchange(SSL *s);
78static int ssl3_send_certificate_request(SSL *s);
79static int ssl3_send_server_done(SSL *s);
80static int ssl3_get_client_key_exchange(SSL *s);
81static int ssl3_get_client_certificate(SSL *s);
82static int ssl3_get_cert_verify(SSL *s);
83static int ssl3_send_hello_request(SSL *s);
84
85static SSL_METHOD *ssl3_get_server_method(int ver)
86 {
87 if (ver == SSL3_VERSION)
88 return(SSLv3_server_method());
89 else
90 return(NULL);
91 }
92
93SSL_METHOD *SSLv3_server_method(void)
94 {
95 static int init=1;
96 static SSL_METHOD SSLv3_server_data;
97
98 if (init)
99 {
100 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
101 sizeof(SSL_METHOD));
102 SSLv3_server_data.ssl_accept=ssl3_accept;
103 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
104 init=0;
105 }
106 return(&SSLv3_server_data);
107 }
108
109int ssl3_accept(SSL *s)
110 {
111 BUF_MEM *buf;
112 unsigned long l,Time=time(NULL);
113 void (*cb)()=NULL;
114 long num1;
115 int ret= -1;
116 int new_state,state,skip=0;
117
118 RAND_add(&Time,sizeof(Time),0);
119 ERR_clear_error();
120 clear_sys_error();
121
122 if (s->info_callback != NULL)
123 cb=s->info_callback;
124 else if (s->ctx->info_callback != NULL)
125 cb=s->ctx->info_callback;
126
127 /* init things to blank */
128 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
129 s->in_handshake++;
130
131 if (s->cert == NULL)
132 {
133 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
134 return(-1);
135 }
136
137 for (;;)
138 {
139 state=s->state;
140
141 switch (s->state)
142 {
143 case SSL_ST_RENEGOTIATE:
144 s->new_session=1;
145 /* s->state=SSL_ST_ACCEPT; */
146
147 case SSL_ST_BEFORE:
148 case SSL_ST_ACCEPT:
149 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
150 case SSL_ST_OK|SSL_ST_ACCEPT:
151
152 s->server=1;
153 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
154
155 if ((s->version>>8) != 3)
156 abort();
157 s->type=SSL_ST_ACCEPT;
158
159 if (s->init_buf == NULL)
160 {
161 if ((buf=BUF_MEM_new()) == NULL)
162 {
163 ret= -1;
164 goto end;
165 }
166 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
167 {
168 ret= -1;
169 goto end;
170 }
171 s->init_buf=buf;
172 }
173
174 if (!ssl3_setup_buffers(s))
175 {
176 ret= -1;
177 goto end;
178 }
179
180 /* Ok, we now need to push on a buffering BIO so that
181 * the output is sent in a way that TCP likes :-)
182 */
183 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
184
185 s->init_num=0;
186
187 if (s->state != SSL_ST_RENEGOTIATE)
188 {
189 ssl3_init_finished_mac(s);
190 s->state=SSL3_ST_SR_CLNT_HELLO_A;
191 s->ctx->stats.sess_accept++;
192 }
193 else
194 {
195 s->ctx->stats.sess_accept_renegotiate++;
196 s->state=SSL3_ST_SW_HELLO_REQ_A;
197 }
198 break;
199
200 case SSL3_ST_SW_HELLO_REQ_A:
201 case SSL3_ST_SW_HELLO_REQ_B:
202
203 s->shutdown=0;
204 ret=ssl3_send_hello_request(s);
205 if (ret <= 0) goto end;
206 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
207 s->state=SSL3_ST_SW_FLUSH;
208 s->init_num=0;
209
210 ssl3_init_finished_mac(s);
211 break;
212
213 case SSL3_ST_SW_HELLO_REQ_C:
214 s->state=SSL_ST_OK;
215 ret=1;
216 goto end;
217 /* break; */
218
219 case SSL3_ST_SR_CLNT_HELLO_A:
220 case SSL3_ST_SR_CLNT_HELLO_B:
221 case SSL3_ST_SR_CLNT_HELLO_C:
222
223 s->shutdown=0;
224 ret=ssl3_get_client_hello(s);
225 if (ret <= 0) goto end;
226 s->state=SSL3_ST_SW_SRVR_HELLO_A;
227 s->init_num=0;
228 break;
229
230 case SSL3_ST_SW_SRVR_HELLO_A:
231 case SSL3_ST_SW_SRVR_HELLO_B:
232 ret=ssl3_send_server_hello(s);
233 if (ret <= 0) goto end;
234
235 if (s->hit)
236 s->state=SSL3_ST_SW_CHANGE_A;
237 else
238 s->state=SSL3_ST_SW_CERT_A;
239 s->init_num=0;
240 break;
241
242 case SSL3_ST_SW_CERT_A:
243 case SSL3_ST_SW_CERT_B:
244 /* Check if it is anon DH */
245 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
246 {
247 ret=ssl3_send_server_certificate(s);
248 if (ret <= 0) goto end;
249 }
250 else
251 skip=1;
252 s->state=SSL3_ST_SW_KEY_EXCH_A;
253 s->init_num=0;
254 break;
255
256 case SSL3_ST_SW_KEY_EXCH_A:
257 case SSL3_ST_SW_KEY_EXCH_B:
258 l=s->s3->tmp.new_cipher->algorithms;
259
260 /* clear this, it may get reset by
261 * send_server_key_exchange */
262 if (s->options & SSL_OP_EPHEMERAL_RSA)
263 s->s3->tmp.use_rsa_tmp=1;
264 else
265 s->s3->tmp.use_rsa_tmp=0;
266
267 /* only send if a DH key exchange, fortezza or
268 * RSA but we have a sign only certificate */
269 if (s->s3->tmp.use_rsa_tmp
270 || (l & (SSL_DH|SSL_kFZA))
271 || ((l & SSL_kRSA)
272 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
273 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
274 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
275 )
276 )
277 )
278 )
279 {
280 ret=ssl3_send_server_key_exchange(s);
281 if (ret <= 0) goto end;
282 }
283 else
284 skip=1;
285
286 s->state=SSL3_ST_SW_CERT_REQ_A;
287 s->init_num=0;
288 break;
289
290 case SSL3_ST_SW_CERT_REQ_A:
291 case SSL3_ST_SW_CERT_REQ_B:
292 if (/* don't request cert unless asked for it: */
293 !(s->verify_mode & SSL_VERIFY_PEER) ||
294 /* if SSL_VERIFY_CLIENT_ONCE is set,
295 * don't request cert during re-negotiation: */
296 ((s->session->peer != NULL) &&
297 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
298 /* never request cert in anonymous ciphersuites
299 * (see section "Certificate request" in SSL 3 drafts
300 * and in RFC 2246): */
301 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
302 /* ... except when the application insists on verification
303 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
304 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
305 {
306 /* no cert request */
307 skip=1;
308 s->s3->tmp.cert_request=0;
309 s->state=SSL3_ST_SW_SRVR_DONE_A;
310 }
311 else
312 {
313 s->s3->tmp.cert_request=1;
314 ret=ssl3_send_certificate_request(s);
315 if (ret <= 0) goto end;
316#ifndef NETSCAPE_HANG_BUG
317 s->state=SSL3_ST_SW_SRVR_DONE_A;
318#else
319 s->state=SSL3_ST_SW_FLUSH;
320 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
321#endif
322 s->init_num=0;
323 }
324 break;
325
326 case SSL3_ST_SW_SRVR_DONE_A:
327 case SSL3_ST_SW_SRVR_DONE_B:
328 ret=ssl3_send_server_done(s);
329 if (ret <= 0) goto end;
330 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
331 s->state=SSL3_ST_SW_FLUSH;
332 s->init_num=0;
333 break;
334
335 case SSL3_ST_SW_FLUSH:
336 /* number of bytes to be flushed */
337 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
338 if (num1 > 0)
339 {
340 s->rwstate=SSL_WRITING;
341 num1=BIO_flush(s->wbio);
342 if (num1 <= 0) { ret= -1; goto end; }
343 s->rwstate=SSL_NOTHING;
344 }
345
346 s->state=s->s3->tmp.next_state;
347 break;
348
349 case SSL3_ST_SR_CERT_A:
350 case SSL3_ST_SR_CERT_B:
351 /* Check for second client hello (MS SGC) */
352 ret = ssl3_check_client_hello(s);
353 if (ret <= 0)
354 goto end;
355 if (ret == 2)
356 s->state = SSL3_ST_SR_CLNT_HELLO_C;
357 else {
358 /* could be sent for a DH cert, even if we
359 * have not asked for it :-) */
360 ret=ssl3_get_client_certificate(s);
361 if (ret <= 0) goto end;
362 s->init_num=0;
363 s->state=SSL3_ST_SR_KEY_EXCH_A;
364 }
365 break;
366
367 case SSL3_ST_SR_KEY_EXCH_A:
368 case SSL3_ST_SR_KEY_EXCH_B:
369 ret=ssl3_get_client_key_exchange(s);
370 if (ret <= 0) goto end;
371 s->state=SSL3_ST_SR_CERT_VRFY_A;
372 s->init_num=0;
373
374 /* We need to get hashes here so if there is
375 * a client cert, it can be verified */
376 s->method->ssl3_enc->cert_verify_mac(s,
377 &(s->s3->finish_dgst1),
378 &(s->s3->tmp.cert_verify_md[0]));
379 s->method->ssl3_enc->cert_verify_mac(s,
380 &(s->s3->finish_dgst2),
381 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
382
383 break;
384
385 case SSL3_ST_SR_CERT_VRFY_A:
386 case SSL3_ST_SR_CERT_VRFY_B:
387
388 /* we should decide if we expected this one */
389 ret=ssl3_get_cert_verify(s);
390 if (ret <= 0) goto end;
391
392 s->state=SSL3_ST_SR_FINISHED_A;
393 s->init_num=0;
394 break;
395
396 case SSL3_ST_SR_FINISHED_A:
397 case SSL3_ST_SR_FINISHED_B:
398 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
399 SSL3_ST_SR_FINISHED_B);
400 if (ret <= 0) goto end;
401 if (s->hit)
402 s->state=SSL_ST_OK;
403 else
404 s->state=SSL3_ST_SW_CHANGE_A;
405 s->init_num=0;
406 break;
407
408 case SSL3_ST_SW_CHANGE_A:
409 case SSL3_ST_SW_CHANGE_B:
410
411 s->session->cipher=s->s3->tmp.new_cipher;
412 if (!s->method->ssl3_enc->setup_key_block(s))
413 { ret= -1; goto end; }
414
415 ret=ssl3_send_change_cipher_spec(s,
416 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
417
418 if (ret <= 0) goto end;
419 s->state=SSL3_ST_SW_FINISHED_A;
420 s->init_num=0;
421
422 if (!s->method->ssl3_enc->change_cipher_state(s,
423 SSL3_CHANGE_CIPHER_SERVER_WRITE))
424 {
425 ret= -1;
426 goto end;
427 }
428
429 break;
430
431 case SSL3_ST_SW_FINISHED_A:
432 case SSL3_ST_SW_FINISHED_B:
433 ret=ssl3_send_finished(s,
434 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
435 s->method->ssl3_enc->server_finished_label,
436 s->method->ssl3_enc->server_finished_label_len);
437 if (ret <= 0) goto end;
438 s->state=SSL3_ST_SW_FLUSH;
439 if (s->hit)
440 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
441 else
442 s->s3->tmp.next_state=SSL_ST_OK;
443 s->init_num=0;
444 break;
445
446 case SSL_ST_OK:
447 /* clean a few things up */
448 ssl3_cleanup_key_block(s);
449
450 BUF_MEM_free(s->init_buf);
451 s->init_buf=NULL;
452
453 /* remove buffering on output */
454 ssl_free_wbio_buffer(s);
455
456 s->new_session=0;
457 s->init_num=0;
458
459 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
460
461 s->ctx->stats.sess_accept_good++;
462 /* s->server=1; */
463 s->handshake_func=ssl3_accept;
464 ret=1;
465
466 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
467
468 goto end;
469 /* break; */
470
471 default:
472 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
473 ret= -1;
474 goto end;
475 /* break; */
476 }
477
478 if (!s->s3->tmp.reuse_message && !skip)
479 {
480 if (s->debug)
481 {
482 if ((ret=BIO_flush(s->wbio)) <= 0)
483 goto end;
484 }
485
486
487 if ((cb != NULL) && (s->state != state))
488 {
489 new_state=s->state;
490 s->state=state;
491 cb(s,SSL_CB_ACCEPT_LOOP,1);
492 s->state=new_state;
493 }
494 }
495 skip=0;
496 }
497end:
498 /* BIO_flush(s->wbio); */
499
500 if (cb != NULL)
501 cb(s,SSL_CB_ACCEPT_EXIT,ret);
502 s->in_handshake--;
503 return(ret);
504 }
505
506static int ssl3_send_hello_request(SSL *s)
507 {
508 unsigned char *p;
509
510 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
511 {
512 p=(unsigned char *)s->init_buf->data;
513 *(p++)=SSL3_MT_HELLO_REQUEST;
514 *(p++)=0;
515 *(p++)=0;
516 *(p++)=0;
517
518 s->state=SSL3_ST_SW_HELLO_REQ_B;
519 /* number of bytes to write */
520 s->init_num=4;
521 s->init_off=0;
522 }
523
524 /* SSL3_ST_SW_HELLO_REQ_B */
525 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
526 }
527
528static int ssl3_check_client_hello(SSL *s)
529 {
530 int ok;
531 long n;
532
533 n=ssl3_get_message(s,
534 SSL3_ST_SR_CERT_A,
535 SSL3_ST_SR_CERT_B,
536 -1,
537 SSL3_RT_MAX_PLAIN_LENGTH,
538 &ok);
539 if (!ok) return((int)n);
540 s->s3->tmp.reuse_message = 1;
541 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
542 {
543 /* Throw away what we have done so far in the current handshake,
544 * which will now be aborted. (A full SSL_clear would be too much.)
545 * I hope that tmp.dh is the only thing that may need to be cleared
546 * when a handshake is not completed ... */
547#ifndef NO_DH
548 if (s->s3->tmp.dh != NULL)
549 {
550 DH_free(s->s3->tmp.dh);
551 s->s3->tmp.dh = NULL;
552 }
553#endif
554 return 2;
555 }
556 return 1;
557}
558
559static int ssl3_get_client_hello(SSL *s)
560 {
561 int i,j,ok,al,ret= -1;
562 long n;
563 unsigned long id;
564 unsigned char *p,*d,*q;
565 SSL_CIPHER *c;
566 SSL_COMP *comp=NULL;
567 STACK_OF(SSL_CIPHER) *ciphers=NULL;
568
569 /* We do this so that we will respond with our native type.
570 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
571 * This down switching should be handled by a different method.
572 * If we are SSLv3, we will respond with SSLv3, even if prompted with
573 * TLSv1.
574 */
575 if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
576 {
577 s->first_packet=1;
578 s->state=SSL3_ST_SR_CLNT_HELLO_B;
579 }
580 n=ssl3_get_message(s,
581 SSL3_ST_SR_CLNT_HELLO_B,
582 SSL3_ST_SR_CLNT_HELLO_C,
583 SSL3_MT_CLIENT_HELLO,
584 SSL3_RT_MAX_PLAIN_LENGTH,
585 &ok);
586
587 if (!ok) return((int)n);
588 d=p=(unsigned char *)s->init_buf->data;
589
590 /* use version from inside client hello, not from record header
591 * (may differ: see RFC 2246, Appendix E, second paragraph) */
592 s->client_version=(((int)p[0])<<8)|(int)p[1];
593 p+=2;
594
595 /* load the client random */
596 memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
597 p+=SSL3_RANDOM_SIZE;
598
599 /* get the session-id */
600 j= *(p++);
601
602 s->hit=0;
603 if (j == 0)
604 {
605 if (!ssl_get_new_session(s,1))
606 goto err;
607 }
608 else
609 {
610 i=ssl_get_prev_session(s,p,j);
611 if (i == 1)
612 { /* previous session */
613 s->hit=1;
614 }
615 else if (i == -1)
616 goto err;
617 else /* i == 0 */
618 {
619 if (!ssl_get_new_session(s,1))
620 goto err;
621 }
622 }
623
624 p+=j;
625 n2s(p,i);
626 if ((i == 0) && (j != 0))
627 {
628 /* we need a cipher if we are not resuming a session */
629 al=SSL_AD_ILLEGAL_PARAMETER;
630 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
631 goto f_err;
632 }
633 if ((i+p) > (d+n))
634 {
635 /* not enough data */
636 al=SSL_AD_DECODE_ERROR;
637 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
638 goto f_err;
639 }
640 if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
641 == NULL))
642 {
643 goto err;
644 }
645 p+=i;
646
647 /* If it is a hit, check that the cipher is in the list */
648 if ((s->hit) && (i > 0))
649 {
650 j=0;
651 id=s->session->cipher->id;
652
653#ifdef CIPHER_DEBUG
654 printf("client sent %d ciphers\n",sk_num(ciphers));
655#endif
656 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
657 {
658 c=sk_SSL_CIPHER_value(ciphers,i);
659#ifdef CIPHER_DEBUG
660 printf("client [%2d of %2d]:%s\n",
661 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
662#endif
663 if (c->id == id)
664 {
665 j=1;
666 break;
667 }
668 }
669 if (j == 0)
670 {
671 if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
672 {
673 /* Very bad for multi-threading.... */
674 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
675 0);
676 }
677 else
678 {
679 /* we need to have the cipher in the cipher
680 * list if we are asked to reuse it */
681 al=SSL_AD_ILLEGAL_PARAMETER;
682 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
683 goto f_err;
684 }
685 }
686 }
687
688 /* compression */
689 i= *(p++);
690 q=p;
691 for (j=0; j<i; j++)
692 {
693 if (p[j] == 0) break;
694 }
695
696 p+=i;
697 if (j >= i)
698 {
699 /* no compress */
700 al=SSL_AD_DECODE_ERROR;
701 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
702 goto f_err;
703 }
704
705 /* Worst case, we will use the NULL compression, but if we have other
706 * options, we will now look for them. We have i-1 compression
707 * algorithms from the client, starting at q. */
708 s->s3->tmp.new_compression=NULL;
709 if (s->ctx->comp_methods != NULL)
710 { /* See if we have a match */
711 int m,nn,o,v,done=0;
712
713 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
714 for (m=0; m<nn; m++)
715 {
716 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
717 v=comp->id;
718 for (o=0; o<i; o++)
719 {
720 if (v == q[o])
721 {
722 done=1;
723 break;
724 }
725 }
726 if (done) break;
727 }
728 if (done)
729 s->s3->tmp.new_compression=comp;
730 else
731 comp=NULL;
732 }
733
734 /* TLS does not mind if there is extra stuff */
735 if (s->version == SSL3_VERSION)
736 {
737 if (p > (d+n))
738 {
739 /* wrong number of bytes,
740 * there could be more to follow */
741 al=SSL_AD_DECODE_ERROR;
742 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
743 goto f_err;
744 }
745 }
746
747 /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
748 * pick a cipher */
749
750 if (!s->hit)
751 {
752 s->session->compress_meth=(comp == NULL)?0:comp->id;
753 if (s->session->ciphers != NULL)
754 sk_SSL_CIPHER_free(s->session->ciphers);
755 s->session->ciphers=ciphers;
756 if (ciphers == NULL)
757 {
758 al=SSL_AD_ILLEGAL_PARAMETER;
759 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
760 goto f_err;
761 }
762 ciphers=NULL;
763 c=ssl3_choose_cipher(s,s->session->ciphers,
764 ssl_get_ciphers_by_id(s));
765
766 if (c == NULL)
767 {
768 al=SSL_AD_HANDSHAKE_FAILURE;
769 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
770 goto f_err;
771 }
772 s->s3->tmp.new_cipher=c;
773 }
774 else
775 {
776 /* Session-id reuse */
777#ifdef REUSE_CIPHER_BUG
778 STACK_OF(SSL_CIPHER) *sk;
779 SSL_CIPHER *nc=NULL;
780 SSL_CIPHER *ec=NULL;
781
782 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
783 {
784 sk=s->session->ciphers;
785 for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
786 {
787 c=sk_SSL_CIPHER_value(sk,i);
788 if (c->algorithms & SSL_eNULL)
789 nc=c;
790 if (SSL_C_IS_EXPORT(c))
791 ec=c;
792 }
793 if (nc != NULL)
794 s->s3->tmp.new_cipher=nc;
795 else if (ec != NULL)
796 s->s3->tmp.new_cipher=ec;
797 else
798 s->s3->tmp.new_cipher=s->session->cipher;
799 }
800 else
801#endif
802 s->s3->tmp.new_cipher=s->session->cipher;
803 }
804
805 /* we now have the following setup.
806 * client_random
807 * cipher_list - our prefered list of ciphers
808 * ciphers - the clients prefered list of ciphers
809 * compression - basically ignored right now
810 * ssl version is set - sslv3
811 * s->session - The ssl session has been setup.
812 * s->hit - session reuse flag
813 * s->tmp.new_cipher - the new cipher to use.
814 */
815
816 ret=1;
817 if (0)
818 {
819f_err:
820 ssl3_send_alert(s,SSL3_AL_FATAL,al);
821 }
822err:
823 if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
824 return(ret);
825 }
826
827static int ssl3_send_server_hello(SSL *s)
828 {
829 unsigned char *buf;
830 unsigned char *p,*d;
831 int i,sl;
832 unsigned long l,Time;
833
834 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
835 {
836 buf=(unsigned char *)s->init_buf->data;
837 p=s->s3->server_random;
838 Time=time(NULL); /* Time */
839 l2n(Time,p);
840 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
841 /* Do the message type and length last */
842 d=p= &(buf[4]);
843
844 *(p++)=s->version>>8;
845 *(p++)=s->version&0xff;
846
847 /* Random stuff */
848 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
849 p+=SSL3_RANDOM_SIZE;
850
851 /* now in theory we have 3 options to sending back the
852 * session id. If it is a re-use, we send back the
853 * old session-id, if it is a new session, we send
854 * back the new session-id or we send back a 0 length
855 * session-id if we want it to be single use.
856 * Currently I will not implement the '0' length session-id
857 * 12-Jan-98 - I'll now support the '0' length stuff.
858 */
859 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
860 s->session->session_id_length=0;
861
862 sl=s->session->session_id_length;
863 *(p++)=sl;
864 memcpy(p,s->session->session_id,sl);
865 p+=sl;
866
867 /* put the cipher */
868 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
869 p+=i;
870
871 /* put the compression method */
872 if (s->s3->tmp.new_compression == NULL)
873 *(p++)=0;
874 else
875 *(p++)=s->s3->tmp.new_compression->id;
876
877 /* do the header */
878 l=(p-d);
879 d=buf;
880 *(d++)=SSL3_MT_SERVER_HELLO;
881 l2n3(l,d);
882
883 s->state=SSL3_ST_CW_CLNT_HELLO_B;
884 /* number of bytes to write */
885 s->init_num=p-buf;
886 s->init_off=0;
887 }
888
889 /* SSL3_ST_CW_CLNT_HELLO_B */
890 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
891 }
892
893static int ssl3_send_server_done(SSL *s)
894 {
895 unsigned char *p;
896
897 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
898 {
899 p=(unsigned char *)s->init_buf->data;
900
901 /* do the header */
902 *(p++)=SSL3_MT_SERVER_DONE;
903 *(p++)=0;
904 *(p++)=0;
905 *(p++)=0;
906
907 s->state=SSL3_ST_SW_SRVR_DONE_B;
908 /* number of bytes to write */
909 s->init_num=4;
910 s->init_off=0;
911 }
912
913 /* SSL3_ST_CW_CLNT_HELLO_B */
914 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
915 }
916
917static int ssl3_send_server_key_exchange(SSL *s)
918 {
919#ifndef NO_RSA
920 unsigned char *q;
921 int j,num;
922 RSA *rsa;
923 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
924 unsigned int u;
925#endif
926#ifndef NO_DH
927 DH *dh=NULL,*dhp;
928#endif
929 EVP_PKEY *pkey;
930 unsigned char *p,*d;
931 int al,i;
932 unsigned long type;
933 int n;
934 CERT *cert;
935 BIGNUM *r[4];
936 int nr[4],kn;
937 BUF_MEM *buf;
938 EVP_MD_CTX md_ctx;
939
940 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
941 {
942 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
943 cert=s->cert;
944
945 buf=s->init_buf;
946
947 r[0]=r[1]=r[2]=r[3]=NULL;
948 n=0;
949#ifndef NO_RSA
950 if (type & SSL_kRSA)
951 {
952 rsa=cert->rsa_tmp;
953 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
954 {
955 rsa=s->cert->rsa_tmp_cb(s,
956 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
957 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
958 if(rsa == NULL)
959 {
960 al=SSL_AD_HANDSHAKE_FAILURE;
961 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
962 goto f_err;
963 }
964 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
965 cert->rsa_tmp=rsa;
966 }
967 if (rsa == NULL)
968 {
969 al=SSL_AD_HANDSHAKE_FAILURE;
970 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
971 goto f_err;
972 }
973 r[0]=rsa->n;
974 r[1]=rsa->e;
975 s->s3->tmp.use_rsa_tmp=1;
976 }
977 else
978#endif
979#ifndef NO_DH
980 if (type & SSL_kEDH)
981 {
982 dhp=cert->dh_tmp;
983 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
984 dhp=s->cert->dh_tmp_cb(s,
985 !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
986 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
987 if (dhp == NULL)
988 {
989 al=SSL_AD_HANDSHAKE_FAILURE;
990 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
991 goto f_err;
992 }
993
994 if (s->s3->tmp.dh != NULL)
995 {
996 DH_free(dh);
997 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
998 goto err;
999 }
1000
1001 if ((dh=DHparams_dup(dhp)) == NULL)
1002 {
1003 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1004 goto err;
1005 }
1006
1007 s->s3->tmp.dh=dh;
1008 if ((dhp->pub_key == NULL ||
1009 dhp->priv_key == NULL ||
1010 (s->options & SSL_OP_SINGLE_DH_USE)))
1011 {
1012 if(!DH_generate_key(dh))
1013 {
1014 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1015 ERR_R_DH_LIB);
1016 goto err;
1017 }
1018 }
1019 else
1020 {
1021 dh->pub_key=BN_dup(dhp->pub_key);
1022 dh->priv_key=BN_dup(dhp->priv_key);
1023 if ((dh->pub_key == NULL) ||
1024 (dh->priv_key == NULL))
1025 {
1026 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1027 goto err;
1028 }
1029 }
1030 r[0]=dh->p;
1031 r[1]=dh->g;
1032 r[2]=dh->pub_key;
1033 }
1034 else
1035#endif
1036 {
1037 al=SSL_AD_HANDSHAKE_FAILURE;
1038 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1039 goto f_err;
1040 }
1041 for (i=0; r[i] != NULL; i++)
1042 {
1043 nr[i]=BN_num_bytes(r[i]);
1044 n+=2+nr[i];
1045 }
1046
1047 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1048 {
1049 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1050 == NULL)
1051 {
1052 al=SSL_AD_DECODE_ERROR;
1053 goto f_err;
1054 }
1055 kn=EVP_PKEY_size(pkey);
1056 }
1057 else
1058 {
1059 pkey=NULL;
1060 kn=0;
1061 }
1062
1063 if (!BUF_MEM_grow(buf,n+4+kn))
1064 {
1065 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1066 goto err;
1067 }
1068 d=(unsigned char *)s->init_buf->data;
1069 p= &(d[4]);
1070
1071 for (i=0; r[i] != NULL; i++)
1072 {
1073 s2n(nr[i],p);
1074 BN_bn2bin(r[i],p);
1075 p+=nr[i];
1076 }
1077
1078 /* not anonymous */
1079 if (pkey != NULL)
1080 {
1081 /* n is the length of the params, they start at &(d[4])
1082 * and p points to the space at the end. */
1083#ifndef NO_RSA
1084 if (pkey->type == EVP_PKEY_RSA)
1085 {
1086 q=md_buf;
1087 j=0;
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,&(d[4]),n);
1095 EVP_DigestFinal(&md_ctx,q,
1096 (unsigned int *)&i);
1097 q+=i;
1098 j+=i;
1099 }
1100 if (RSA_sign(NID_md5_sha1, md_buf, j,
1101 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1102 {
1103 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1104 goto err;
1105 }
1106 s2n(u,p);
1107 n+=u+2;
1108 }
1109 else
1110#endif
1111#if !defined(NO_DSA)
1112 if (pkey->type == EVP_PKEY_DSA)
1113 {
1114 /* lets do DSS */
1115 EVP_SignInit(&md_ctx,EVP_dss1());
1116 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1117 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1118 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1119 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1120 (unsigned int *)&i,pkey))
1121 {
1122 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1123 goto err;
1124 }
1125 s2n(i,p);
1126 n+=i+2;
1127 }
1128 else
1129#endif
1130 {
1131 /* Is this error check actually needed? */
1132 al=SSL_AD_HANDSHAKE_FAILURE;
1133 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1134 goto f_err;
1135 }
1136 }
1137
1138 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1139 l2n3(n,d);
1140
1141 /* we should now have things packed up, so lets send
1142 * it off */
1143 s->init_num=n+4;
1144 s->init_off=0;
1145 }
1146
1147 s->state = SSL3_ST_SW_KEY_EXCH_B;
1148 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1149f_err:
1150 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1151err:
1152 return(-1);
1153 }
1154
1155static int ssl3_send_certificate_request(SSL *s)
1156 {
1157 unsigned char *p,*d;
1158 int i,j,nl,off,n;
1159 STACK_OF(X509_NAME) *sk=NULL;
1160 X509_NAME *name;
1161 BUF_MEM *buf;
1162
1163 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1164 {
1165 buf=s->init_buf;
1166
1167 d=p=(unsigned char *)&(buf->data[4]);
1168
1169 /* get the list of acceptable cert types */
1170 p++;
1171 n=ssl3_get_req_cert_type(s,p);
1172 d[0]=n;
1173 p+=n;
1174 n++;
1175
1176 off=n;
1177 p+=2;
1178 n+=2;
1179
1180 sk=SSL_get_client_CA_list(s);
1181 nl=0;
1182 if (sk != NULL)
1183 {
1184 for (i=0; i<sk_X509_NAME_num(sk); i++)
1185 {
1186 name=sk_X509_NAME_value(sk,i);
1187 j=i2d_X509_NAME(name,NULL);
1188 if (!BUF_MEM_grow(buf,4+n+j+2))
1189 {
1190 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1191 goto err;
1192 }
1193 p=(unsigned char *)&(buf->data[4+n]);
1194 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1195 {
1196 s2n(j,p);
1197 i2d_X509_NAME(name,&p);
1198 n+=2+j;
1199 nl+=2+j;
1200 }
1201 else
1202 {
1203 d=p;
1204 i2d_X509_NAME(name,&p);
1205 j-=2; s2n(j,d); j+=2;
1206 n+=j;
1207 nl+=j;
1208 }
1209 }
1210 }
1211 /* else no CA names */
1212 p=(unsigned char *)&(buf->data[4+off]);
1213 s2n(nl,p);
1214
1215 d=(unsigned char *)buf->data;
1216 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1217 l2n3(n,d);
1218
1219 /* we should now have things packed up, so lets send
1220 * it off */
1221
1222 s->init_num=n+4;
1223 s->init_off=0;
1224#ifdef NETSCAPE_HANG_BUG
1225 p=(unsigned char *)s->init_buf->data + s->init_num;
1226
1227 /* do the header */
1228 *(p++)=SSL3_MT_SERVER_DONE;
1229 *(p++)=0;
1230 *(p++)=0;
1231 *(p++)=0;
1232 s->init_num += 4;
1233#endif
1234
1235 }
1236
1237 /* SSL3_ST_SW_CERT_REQ_B */
1238 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1239err:
1240 return(-1);
1241 }
1242
1243static int ssl3_get_client_key_exchange(SSL *s)
1244 {
1245 int i,al,ok;
1246 long n;
1247 unsigned long l;
1248 unsigned char *p;
1249#ifndef NO_RSA
1250 RSA *rsa=NULL;
1251 EVP_PKEY *pkey=NULL;
1252#endif
1253#ifndef NO_DH
1254 BIGNUM *pub=NULL;
1255 DH *dh_srvr;
1256#endif
1257
1258 n=ssl3_get_message(s,
1259 SSL3_ST_SR_KEY_EXCH_A,
1260 SSL3_ST_SR_KEY_EXCH_B,
1261 SSL3_MT_CLIENT_KEY_EXCHANGE,
1262 400, /* ???? */
1263 &ok);
1264
1265 if (!ok) return((int)n);
1266 p=(unsigned char *)s->init_buf->data;
1267
1268 l=s->s3->tmp.new_cipher->algorithms;
1269
1270#ifndef NO_RSA
1271 if (l & SSL_kRSA)
1272 {
1273 /* FIX THIS UP EAY EAY EAY EAY */
1274 if (s->s3->tmp.use_rsa_tmp)
1275 {
1276 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1277 rsa=s->cert->rsa_tmp;
1278 /* Don't do a callback because rsa_tmp should
1279 * be sent already */
1280 if (rsa == NULL)
1281 {
1282 al=SSL_AD_HANDSHAKE_FAILURE;
1283 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1284 goto f_err;
1285
1286 }
1287 }
1288 else
1289 {
1290 pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1291 if ( (pkey == NULL) ||
1292 (pkey->type != EVP_PKEY_RSA) ||
1293 (pkey->pkey.rsa == NULL))
1294 {
1295 al=SSL_AD_HANDSHAKE_FAILURE;
1296 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1297 goto f_err;
1298 }
1299 rsa=pkey->pkey.rsa;
1300 }
1301
1302 /* TLS */
1303 if (s->version > SSL3_VERSION)
1304 {
1305 n2s(p,i);
1306 if (n != i+2)
1307 {
1308 if (!(s->options & SSL_OP_TLS_D5_BUG))
1309 {
1310 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1311 goto err;
1312 }
1313 else
1314 p-=2;
1315 }
1316 else
1317 n=i;
1318 }
1319
1320 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1321
1322 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1323 {
1324 al=SSL_AD_DECODE_ERROR;
1325 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1326 goto f_err;
1327 }
1328
1329 if ((p[0] != (s->client_version>>8)) || (p[1] != (s->client_version & 0xff)))
1330 {
1331 al=SSL_AD_DECODE_ERROR;
1332 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1333 goto f_err;
1334 }
1335
1336 s->session->master_key_length=
1337 s->method->ssl3_enc->generate_master_secret(s,
1338 s->session->master_key,
1339 p,i);
1340 memset(p,0,i);
1341 }
1342 else
1343#endif
1344#ifndef NO_DH
1345 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1346 {
1347 n2s(p,i);
1348 if (n != i+2)
1349 {
1350 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1351 {
1352 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1353 goto err;
1354 }
1355 else
1356 {
1357 p-=2;
1358 i=(int)n;
1359 }
1360 }
1361
1362 if (n == 0L) /* the parameters are in the cert */
1363 {
1364 al=SSL_AD_HANDSHAKE_FAILURE;
1365 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1366 goto f_err;
1367 }
1368 else
1369 {
1370 if (s->s3->tmp.dh == NULL)
1371 {
1372 al=SSL_AD_HANDSHAKE_FAILURE;
1373 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1374 goto f_err;
1375 }
1376 else
1377 dh_srvr=s->s3->tmp.dh;
1378 }
1379
1380 pub=BN_bin2bn(p,i,NULL);
1381 if (pub == NULL)
1382 {
1383 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1384 goto err;
1385 }
1386
1387 i=DH_compute_key(p,pub,dh_srvr);
1388
1389 if (i <= 0)
1390 {
1391 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1392 goto err;
1393 }
1394
1395 DH_free(s->s3->tmp.dh);
1396 s->s3->tmp.dh=NULL;
1397
1398 BN_clear_free(pub);
1399 pub=NULL;
1400 s->session->master_key_length=
1401 s->method->ssl3_enc->generate_master_secret(s,
1402 s->session->master_key,p,i);
1403 }
1404 else
1405#endif
1406 {
1407 al=SSL_AD_HANDSHAKE_FAILURE;
1408 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1409 goto f_err;
1410 }
1411
1412 return(1);
1413f_err:
1414 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1415#if !defined(NO_DH) || !defined(NO_RSA)
1416err:
1417#endif
1418 return(-1);
1419 }
1420
1421static int ssl3_get_cert_verify(SSL *s)
1422 {
1423 EVP_PKEY *pkey=NULL;
1424 unsigned char *p;
1425 int al,ok,ret=0;
1426 long n;
1427 int type=0,i,j;
1428 X509 *peer;
1429
1430 n=ssl3_get_message(s,
1431 SSL3_ST_SR_CERT_VRFY_A,
1432 SSL3_ST_SR_CERT_VRFY_B,
1433 -1,
1434 512, /* 512? */
1435 &ok);
1436
1437 if (!ok) return((int)n);
1438
1439 if (s->session->peer != NULL)
1440 {
1441 peer=s->session->peer;
1442 pkey=X509_get_pubkey(peer);
1443 type=X509_certificate_type(peer,pkey);
1444 }
1445 else
1446 {
1447 peer=NULL;
1448 pkey=NULL;
1449 }
1450
1451 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1452 {
1453 s->s3->tmp.reuse_message=1;
1454 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1455 {
1456 al=SSL_AD_UNEXPECTED_MESSAGE;
1457 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1458 goto f_err;
1459 }
1460 ret=1;
1461 goto end;
1462 }
1463
1464 if (peer == NULL)
1465 {
1466 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1467 al=SSL_AD_UNEXPECTED_MESSAGE;
1468 goto f_err;
1469 }
1470
1471 if (!(type & EVP_PKT_SIGN))
1472 {
1473 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1474 al=SSL_AD_ILLEGAL_PARAMETER;
1475 goto f_err;
1476 }
1477
1478 if (s->s3->change_cipher_spec)
1479 {
1480 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1481 al=SSL_AD_UNEXPECTED_MESSAGE;
1482 goto f_err;
1483 }
1484
1485 /* we now have a signature that we need to verify */
1486 p=(unsigned char *)s->init_buf->data;
1487 n2s(p,i);
1488 n-=2;
1489 if (i > n)
1490 {
1491 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1492 al=SSL_AD_DECODE_ERROR;
1493 goto f_err;
1494 }
1495
1496 j=EVP_PKEY_size(pkey);
1497 if ((i > j) || (n > j) || (n <= 0))
1498 {
1499 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1500 al=SSL_AD_DECODE_ERROR;
1501 goto f_err;
1502 }
1503
1504#ifndef NO_RSA
1505 if (pkey->type == EVP_PKEY_RSA)
1506 {
1507 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1508 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1509 pkey->pkey.rsa);
1510 if (i < 0)
1511 {
1512 al=SSL_AD_DECRYPT_ERROR;
1513 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1514 goto f_err;
1515 }
1516 if (i == 0)
1517 {
1518 al=SSL_AD_DECRYPT_ERROR;
1519 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1520 goto f_err;
1521 }
1522 }
1523 else
1524#endif
1525#ifndef NO_DSA
1526 if (pkey->type == EVP_PKEY_DSA)
1527 {
1528 j=DSA_verify(pkey->save_type,
1529 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1530 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1531 if (j <= 0)
1532 {
1533 /* bad signature */
1534 al=SSL_AD_DECRYPT_ERROR;
1535 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1536 goto f_err;
1537 }
1538 }
1539 else
1540#endif
1541 {
1542 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1543 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1544 goto f_err;
1545 }
1546
1547
1548 ret=1;
1549 if (0)
1550 {
1551f_err:
1552 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1553 }
1554end:
1555 EVP_PKEY_free(pkey);
1556 return(ret);
1557 }
1558
1559static int ssl3_get_client_certificate(SSL *s)
1560 {
1561 int i,ok,al,ret= -1;
1562 X509 *x=NULL;
1563 unsigned long l,nc,llen,n;
1564 unsigned char *p,*d,*q;
1565 STACK_OF(X509) *sk=NULL;
1566
1567 n=ssl3_get_message(s,
1568 SSL3_ST_SR_CERT_A,
1569 SSL3_ST_SR_CERT_B,
1570 -1,
1571#if defined(MSDOS) && !defined(WIN32)
1572 1024*30, /* 30k max cert list :-) */
1573#else
1574 1024*100, /* 100k max cert list :-) */
1575#endif
1576 &ok);
1577
1578 if (!ok) return((int)n);
1579
1580 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1581 {
1582 if ( (s->verify_mode & SSL_VERIFY_PEER) &&
1583 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1584 {
1585 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1586 al=SSL_AD_HANDSHAKE_FAILURE;
1587 goto f_err;
1588 }
1589 /* If tls asked for a client cert, the client must return a 0 list */
1590 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1591 {
1592 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1593 al=SSL_AD_UNEXPECTED_MESSAGE;
1594 goto f_err;
1595 }
1596 s->s3->tmp.reuse_message=1;
1597 return(1);
1598 }
1599
1600 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1601 {
1602 al=SSL_AD_UNEXPECTED_MESSAGE;
1603 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1604 goto f_err;
1605 }
1606 d=p=(unsigned char *)s->init_buf->data;
1607
1608 if ((sk=sk_X509_new_null()) == NULL)
1609 {
1610 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1611 goto err;
1612 }
1613
1614 n2l3(p,llen);
1615 if (llen+3 != n)
1616 {
1617 al=SSL_AD_DECODE_ERROR;
1618 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1619 goto f_err;
1620 }
1621 for (nc=0; nc<llen; )
1622 {
1623 n2l3(p,l);
1624 if ((l+nc+3) > llen)
1625 {
1626 al=SSL_AD_DECODE_ERROR;
1627 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1628 goto f_err;
1629 }
1630
1631 q=p;
1632 x=d2i_X509(NULL,&p,l);
1633 if (x == NULL)
1634 {
1635 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1636 goto err;
1637 }
1638 if (p != (q+l))
1639 {
1640 al=SSL_AD_DECODE_ERROR;
1641 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1642 goto f_err;
1643 }
1644 if (!sk_X509_push(sk,x))
1645 {
1646 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1647 goto err;
1648 }
1649 x=NULL;
1650 nc+=l+3;
1651 }
1652
1653 if (sk_X509_num(sk) <= 0)
1654 {
1655 /* TLS does not mind 0 certs returned */
1656 if (s->version == SSL3_VERSION)
1657 {
1658 al=SSL_AD_HANDSHAKE_FAILURE;
1659 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1660 goto f_err;
1661 }
1662 /* Fail for TLS only if we required a certificate */
1663 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1664 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1665 {
1666 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1667 al=SSL_AD_HANDSHAKE_FAILURE;
1668 goto f_err;
1669 }
1670 }
1671 else
1672 {
1673 i=ssl_verify_cert_chain(s,sk);
1674 if (!i)
1675 {
1676 al=ssl_verify_alarm_type(s->verify_result);
1677 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1678 goto f_err;
1679 }
1680 }
1681
1682 if (s->session->peer != NULL) /* This should not be needed */
1683 X509_free(s->session->peer);
1684 s->session->peer=sk_X509_shift(sk);
1685 s->session->verify_result = s->verify_result;
1686
1687 /* With the current implementation, sess_cert will always be NULL
1688 * when we arrive here. */
1689 if (s->session->sess_cert == NULL)
1690 {
1691 s->session->sess_cert = ssl_sess_cert_new();
1692 if (s->session->sess_cert == NULL)
1693 {
1694 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1695 goto err;
1696 }
1697 }
1698 if (s->session->sess_cert->cert_chain != NULL)
1699 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1700 s->session->sess_cert->cert_chain=sk;
1701 /* Inconsistency alert: cert_chain does *not* include the
1702 * peer's own certificate, while we do include it in s3_clnt.c */
1703
1704 sk=NULL;
1705
1706 ret=1;
1707 if (0)
1708 {
1709f_err:
1710 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1711 }
1712err:
1713 if (x != NULL) X509_free(x);
1714 if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1715 return(ret);
1716 }
1717
1718int ssl3_send_server_certificate(SSL *s)
1719 {
1720 unsigned long l;
1721 X509 *x;
1722
1723 if (s->state == SSL3_ST_SW_CERT_A)
1724 {
1725 x=ssl_get_server_send_cert(s);
1726 if (x == NULL)
1727 {
1728 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1729 return(0);
1730 }
1731
1732 l=ssl3_output_cert_chain(s,x);
1733 s->state=SSL3_ST_SW_CERT_B;
1734 s->init_num=(int)l;
1735 s->init_off=0;
1736 }
1737
1738 /* SSL3_ST_SW_CERT_B */
1739 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1740 }
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-05-03 18:05:15 +0000