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[thirdparty/openssl.git] / ssl / s3_srvr.c
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
61 #include <stdio.h>
62 #include <openssl/buffer.h>
63 #include <openssl/rand.h>
64 #include <openssl/objects.h>
65 #include <openssl/md5.h>
66 #include <openssl/sha.h>
67 #include <openssl/evp.h>
68 #include <openssl/x509.h>
69 #include "ssl_locl.h"
70
71 static SSL_METHOD *ssl3_get_server_method(int ver);
72 static int ssl3_get_client_hello(SSL *s);
73 static int ssl3_check_client_hello(SSL *s);
74 static int ssl3_send_server_hello(SSL *s);
75 static int ssl3_send_server_key_exchange(SSL *s);
76 static int ssl3_send_certificate_request(SSL *s);
77 static int ssl3_send_server_done(SSL *s);
78 static int ssl3_get_cert_verify(SSL *s);
79 static int ssl3_get_client_key_exchange(SSL *s);
80 static int ssl3_get_client_certificate(SSL *s);
81 static int ssl3_send_hello_request(SSL *s);
82
83 static SSL_METHOD *ssl3_get_server_method(int ver)
84 {
85 if (ver == SSL3_VERSION)
86 return(SSLv3_server_method());
87 else
88 return(NULL);
89 }
90
91 SSL_METHOD *SSLv3_server_method(void)
92 {
93 static int init=1;
94 static SSL_METHOD SSLv3_server_data;
95
96 if (init)
97 {
98 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
99 sizeof(SSL_METHOD));
100 SSLv3_server_data.ssl_accept=ssl3_accept;
101 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
102 init=0;
103 }
104 return(&SSLv3_server_data);
105 }
106
107 int ssl3_accept(SSL *s)
108 {
109 BUF_MEM *buf;
110 unsigned long l,Time=time(NULL);
111 void (*cb)()=NULL;
112 long num1;
113 int ret= -1;
114 int new_state,state,skip=0;
115
116 RAND_add(&Time,sizeof(Time),0);
117 ERR_clear_error();
118 clear_sys_error();
119
120 if (s->info_callback != NULL)
121 cb=s->info_callback;
122 else if (s->ctx->info_callback != NULL)
123 cb=s->ctx->info_callback;
124
125 /* init things to blank */
126 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
127 s->in_handshake++;
128
129 if (s->cert == NULL)
130 {
131 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
132 return(-1);
133 }
134
135 for (;;)
136 {
137 state=s->state;
138
139 switch (s->state)
140 {
141 case SSL_ST_RENEGOTIATE:
142 s->new_session=1;
143 /* s->state=SSL_ST_ACCEPT; */
144
145 case SSL3_ST_SR_MS_SGC:
146 case SSL_ST_BEFORE:
147 case SSL_ST_ACCEPT:
148 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
149 case SSL_ST_OK|SSL_ST_ACCEPT:
150
151 s->server=1;
152 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
153
154 if ((s->version>>8) != 3)
155 abort();
156 /* s->version=SSL3_VERSION; */
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 if(s->state != SSL3_ST_SR_MS_SGC) 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 s->state=SSL3_ST_SW_SRVR_DONE_A;
317 s->init_num=0;
318 }
319 break;
320
321 case SSL3_ST_SW_SRVR_DONE_A:
322 case SSL3_ST_SW_SRVR_DONE_B:
323 ret=ssl3_send_server_done(s);
324 if (ret <= 0) goto end;
325 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
326 s->state=SSL3_ST_SW_FLUSH;
327 s->init_num=0;
328 break;
329
330 case SSL3_ST_SW_FLUSH:
331 /* number of bytes to be flushed */
332 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
333 if (num1 > 0)
334 {
335 s->rwstate=SSL_WRITING;
336 num1=BIO_flush(s->wbio);
337 if (num1 <= 0) { ret= -1; goto end; }
338 s->rwstate=SSL_NOTHING;
339 }
340
341 s->state=s->s3->tmp.next_state;
342 break;
343
344 case SSL3_ST_SR_CERT_A:
345 case SSL3_ST_SR_CERT_B:
346 /* Check for second client hello if MS SGC */
347 ret = ssl3_check_client_hello(s);
348 if(ret <= 0) goto end;
349 if(ret == 2) s->state = SSL3_ST_SR_MS_SGC;
350 else {
351 /* could be sent for a DH cert, even if we
352 * have not asked for it :-) */
353 ret=ssl3_get_client_certificate(s);
354 if (ret <= 0) goto end;
355 s->init_num=0;
356 s->state=SSL3_ST_SR_KEY_EXCH_A;
357 }
358 break;
359
360 case SSL3_ST_SR_KEY_EXCH_A:
361 case SSL3_ST_SR_KEY_EXCH_B:
362 ret=ssl3_get_client_key_exchange(s);
363 if (ret <= 0) goto end;
364 s->state=SSL3_ST_SR_CERT_VRFY_A;
365 s->init_num=0;
366
367 /* We need to get hashes here so if there is
368 * a client cert, it can be verified */
369 s->method->ssl3_enc->cert_verify_mac(s,
370 &(s->s3->finish_dgst1),
371 &(s->s3->tmp.cert_verify_md[0]));
372 s->method->ssl3_enc->cert_verify_mac(s,
373 &(s->s3->finish_dgst2),
374 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
375
376 break;
377
378 case SSL3_ST_SR_CERT_VRFY_A:
379 case SSL3_ST_SR_CERT_VRFY_B:
380
381 /* we should decide if we expected this one */
382 ret=ssl3_get_cert_verify(s);
383 if (ret <= 0) goto end;
384
385 s->state=SSL3_ST_SR_FINISHED_A;
386 s->init_num=0;
387 break;
388
389 case SSL3_ST_SR_FINISHED_A:
390 case SSL3_ST_SR_FINISHED_B:
391 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
392 SSL3_ST_SR_FINISHED_B);
393 if (ret <= 0) goto end;
394 if (s->hit)
395 s->state=SSL_ST_OK;
396 else
397 s->state=SSL3_ST_SW_CHANGE_A;
398 s->init_num=0;
399 break;
400
401 case SSL3_ST_SW_CHANGE_A:
402 case SSL3_ST_SW_CHANGE_B:
403
404 s->session->cipher=s->s3->tmp.new_cipher;
405 if (!s->method->ssl3_enc->setup_key_block(s))
406 { ret= -1; goto end; }
407
408 ret=ssl3_send_change_cipher_spec(s,
409 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
410
411 if (ret <= 0) goto end;
412 s->state=SSL3_ST_SW_FINISHED_A;
413 s->init_num=0;
414
415 if (!s->method->ssl3_enc->change_cipher_state(s,
416 SSL3_CHANGE_CIPHER_SERVER_WRITE))
417 {
418 ret= -1;
419 goto end;
420 }
421
422 break;
423
424 case SSL3_ST_SW_FINISHED_A:
425 case SSL3_ST_SW_FINISHED_B:
426 ret=ssl3_send_finished(s,
427 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
428 s->method->ssl3_enc->server_finished_label,
429 s->method->ssl3_enc->server_finished_label_len);
430 if (ret <= 0) goto end;
431 s->state=SSL3_ST_SW_FLUSH;
432 if (s->hit)
433 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
434 else
435 s->s3->tmp.next_state=SSL_ST_OK;
436 s->init_num=0;
437 break;
438
439 case SSL_ST_OK:
440 /* clean a few things up */
441 ssl3_cleanup_key_block(s);
442
443 BUF_MEM_free(s->init_buf);
444 s->init_buf=NULL;
445
446 /* remove buffering on output */
447 ssl_free_wbio_buffer(s);
448
449 s->new_session=0;
450 s->init_num=0;
451
452 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
453
454 s->ctx->stats.sess_accept_good++;
455 /* s->server=1; */
456 s->handshake_func=ssl3_accept;
457 ret=1;
458
459 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
460
461 goto end;
462 /* break; */
463
464 default:
465 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
466 ret= -1;
467 goto end;
468 /* break; */
469 }
470
471 if (!s->s3->tmp.reuse_message && !skip)
472 {
473 if (s->debug)
474 {
475 if ((ret=BIO_flush(s->wbio)) <= 0)
476 goto end;
477 }
478
479
480 if ((cb != NULL) && (s->state != state))
481 {
482 new_state=s->state;
483 s->state=state;
484 cb(s,SSL_CB_ACCEPT_LOOP,1);
485 s->state=new_state;
486 }
487 }
488 skip=0;
489 }
490 end:
491 /* BIO_flush(s->wbio); */
492
493 if (cb != NULL)
494 cb(s,SSL_CB_ACCEPT_EXIT,ret);
495 s->in_handshake--;
496 return(ret);
497 }
498
499 static int ssl3_send_hello_request(SSL *s)
500 {
501 unsigned char *p;
502
503 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
504 {
505 p=(unsigned char *)s->init_buf->data;
506 *(p++)=SSL3_MT_HELLO_REQUEST;
507 *(p++)=0;
508 *(p++)=0;
509 *(p++)=0;
510
511 s->state=SSL3_ST_SW_HELLO_REQ_B;
512 /* number of bytes to write */
513 s->init_num=4;
514 s->init_off=0;
515 }
516
517 /* SSL3_ST_SW_HELLO_REQ_B */
518 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
519 }
520
521 static int ssl3_check_client_hello(SSL *s)
522 {
523 int ok;
524 long n;
525
526 n=ssl3_get_message(s,
527 SSL3_ST_SR_CERT_A,
528 SSL3_ST_SR_CERT_B,
529 -1,
530 SSL3_RT_MAX_PLAIN_LENGTH,
531 &ok);
532 if (!ok) return((int)n);
533 s->s3->tmp.reuse_message = 1;
534 if(s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO) return 2;
535 return 1;
536 }
537
538 static int ssl3_get_client_hello(SSL *s)
539 {
540 int i,j,ok,al,ret= -1;
541 long n;
542 unsigned long id;
543 unsigned char *p,*d,*q;
544 SSL_CIPHER *c;
545 SSL_COMP *comp=NULL;
546 STACK_OF(SSL_CIPHER) *ciphers=NULL;
547
548 /* We do this so that we will respond with our native type.
549 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
550 * This down switching should be handled by a different method.
551 * If we are SSLv3, we will respond with SSLv3, even if prompted with
552 * TLSv1.
553 */
554 if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
555 {
556 s->first_packet=1;
557 s->state=SSL3_ST_SR_CLNT_HELLO_B;
558 }
559 n=ssl3_get_message(s,
560 SSL3_ST_SR_CLNT_HELLO_B,
561 SSL3_ST_SR_CLNT_HELLO_C,
562 SSL3_MT_CLIENT_HELLO,
563 SSL3_RT_MAX_PLAIN_LENGTH,
564 &ok);
565
566 if (!ok) return((int)n);
567 d=p=(unsigned char *)s->init_buf->data;
568
569 /* use version from inside client hello, not from record header
570 * (may differ: see RFC 2246, Appendix E, second paragraph) */
571 s->client_version=(((int)p[0])<<8)|(int)p[1];
572 p+=2;
573
574 /* load the client random */
575 memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
576 p+=SSL3_RANDOM_SIZE;
577
578 /* get the session-id */
579 j= *(p++);
580
581 s->hit=0;
582 if (j == 0)
583 {
584 if (!ssl_get_new_session(s,1))
585 goto err;
586 }
587 else
588 {
589 i=ssl_get_prev_session(s,p,j);
590 if (i == 1)
591 { /* previous session */
592 s->hit=1;
593 }
594 else if (i == -1)
595 goto err;
596 else /* i == 0 */
597 {
598 if (!ssl_get_new_session(s,1))
599 goto err;
600 }
601 }
602
603 p+=j;
604 n2s(p,i);
605 if ((i == 0) && (j != 0))
606 {
607 /* we need a cipher if we are not resuming a session */
608 al=SSL_AD_ILLEGAL_PARAMETER;
609 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
610 goto f_err;
611 }
612 if ((i+p) > (d+n))
613 {
614 /* not enough data */
615 al=SSL_AD_DECODE_ERROR;
616 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
617 goto f_err;
618 }
619 if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
620 == NULL))
621 {
622 goto err;
623 }
624 p+=i;
625
626 /* If it is a hit, check that the cipher is in the list */
627 if ((s->hit) && (i > 0))
628 {
629 j=0;
630 id=s->session->cipher->id;
631
632 #ifdef CIPHER_DEBUG
633 printf("client sent %d ciphers\n",sk_num(ciphers));
634 #endif
635 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
636 {
637 c=sk_SSL_CIPHER_value(ciphers,i);
638 #ifdef CIPHER_DEBUG
639 printf("client [%2d of %2d]:%s\n",
640 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
641 #endif
642 if (c->id == id)
643 {
644 j=1;
645 break;
646 }
647 }
648 if (j == 0)
649 {
650 if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
651 {
652 /* Very bad for multi-threading.... */
653 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
654 0);
655 }
656 else
657 {
658 /* we need to have the cipher in the cipher
659 * list if we are asked to reuse it */
660 al=SSL_AD_ILLEGAL_PARAMETER;
661 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
662 goto f_err;
663 }
664 }
665 }
666
667 /* compression */
668 i= *(p++);
669 q=p;
670 for (j=0; j<i; j++)
671 {
672 if (p[j] == 0) break;
673 }
674
675 p+=i;
676 if (j >= i)
677 {
678 /* no compress */
679 al=SSL_AD_DECODE_ERROR;
680 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
681 goto f_err;
682 }
683
684 /* Worst case, we will use the NULL compression, but if we have other
685 * options, we will now look for them. We have i-1 compression
686 * algorithms from the client, starting at q. */
687 s->s3->tmp.new_compression=NULL;
688 if (s->ctx->comp_methods != NULL)
689 { /* See if we have a match */
690 int m,nn,o,v,done=0;
691
692 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
693 for (m=0; m<nn; m++)
694 {
695 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
696 v=comp->id;
697 for (o=0; o<i; o++)
698 {
699 if (v == q[o])
700 {
701 done=1;
702 break;
703 }
704 }
705 if (done) break;
706 }
707 if (done)
708 s->s3->tmp.new_compression=comp;
709 else
710 comp=NULL;
711 }
712
713 /* TLS does not mind if there is extra stuff */
714 if (s->version == SSL3_VERSION)
715 {
716 if (p > (d+n))
717 {
718 /* wrong number of bytes,
719 * there could be more to follow */
720 al=SSL_AD_DECODE_ERROR;
721 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
722 goto f_err;
723 }
724 }
725
726 /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
727 * pick a cipher */
728
729 if (!s->hit)
730 {
731 s->session->compress_meth=(comp == NULL)?0:comp->id;
732 if (s->session->ciphers != NULL)
733 sk_SSL_CIPHER_free(s->session->ciphers);
734 s->session->ciphers=ciphers;
735 if (ciphers == NULL)
736 {
737 al=SSL_AD_ILLEGAL_PARAMETER;
738 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
739 goto f_err;
740 }
741 ciphers=NULL;
742 c=ssl3_choose_cipher(s,s->session->ciphers,
743 ssl_get_ciphers_by_id(s));
744
745 if (c == NULL)
746 {
747 al=SSL_AD_HANDSHAKE_FAILURE;
748 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
749 goto f_err;
750 }
751 s->s3->tmp.new_cipher=c;
752 }
753 else
754 {
755 /* Session-id reuse */
756 #ifdef REUSE_CIPHER_BUG
757 STACK_OF(SSL_CIPHER) *sk;
758 SSL_CIPHER *nc=NULL;
759 SSL_CIPHER *ec=NULL;
760
761 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
762 {
763 sk=s->session->ciphers;
764 for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
765 {
766 c=sk_SSL_CIPHER_value(sk,i);
767 if (c->algorithms & SSL_eNULL)
768 nc=c;
769 if (SSL_C_IS_EXPORT(c))
770 ec=c;
771 }
772 if (nc != NULL)
773 s->s3->tmp.new_cipher=nc;
774 else if (ec != NULL)
775 s->s3->tmp.new_cipher=ec;
776 else
777 s->s3->tmp.new_cipher=s->session->cipher;
778 }
779 else
780 #endif
781 s->s3->tmp.new_cipher=s->session->cipher;
782 }
783
784 /* we now have the following setup.
785 * client_random
786 * cipher_list - our prefered list of ciphers
787 * ciphers - the clients prefered list of ciphers
788 * compression - basically ignored right now
789 * ssl version is set - sslv3
790 * s->session - The ssl session has been setup.
791 * s->hit - session reuse flag
792 * s->tmp.new_cipher - the new cipher to use.
793 */
794
795 ret=1;
796 if (0)
797 {
798 f_err:
799 ssl3_send_alert(s,SSL3_AL_FATAL,al);
800 }
801 err:
802 if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
803 return(ret);
804 }
805
806 static int ssl3_send_server_hello(SSL *s)
807 {
808 unsigned char *buf;
809 unsigned char *p,*d;
810 int i,sl;
811 unsigned long l,Time;
812
813 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
814 {
815 buf=(unsigned char *)s->init_buf->data;
816 p=s->s3->server_random;
817 Time=time(NULL); /* Time */
818 l2n(Time,p);
819 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
820 /* Do the message type and length last */
821 d=p= &(buf[4]);
822
823 *(p++)=s->version>>8;
824 *(p++)=s->version&0xff;
825
826 /* Random stuff */
827 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
828 p+=SSL3_RANDOM_SIZE;
829
830 /* now in theory we have 3 options to sending back the
831 * session id. If it is a re-use, we send back the
832 * old session-id, if it is a new session, we send
833 * back the new session-id or we send back a 0 length
834 * session-id if we want it to be single use.
835 * Currently I will not implement the '0' length session-id
836 * 12-Jan-98 - I'll now support the '0' length stuff.
837 */
838 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
839 s->session->session_id_length=0;
840
841 sl=s->session->session_id_length;
842 *(p++)=sl;
843 memcpy(p,s->session->session_id,sl);
844 p+=sl;
845
846 /* put the cipher */
847 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
848 p+=i;
849
850 /* put the compression method */
851 if (s->s3->tmp.new_compression == NULL)
852 *(p++)=0;
853 else
854 *(p++)=s->s3->tmp.new_compression->id;
855
856 /* do the header */
857 l=(p-d);
858 d=buf;
859 *(d++)=SSL3_MT_SERVER_HELLO;
860 l2n3(l,d);
861
862 s->state=SSL3_ST_CW_CLNT_HELLO_B;
863 /* number of bytes to write */
864 s->init_num=p-buf;
865 s->init_off=0;
866 }
867
868 /* SSL3_ST_CW_CLNT_HELLO_B */
869 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
870 }
871
872 static int ssl3_send_server_done(SSL *s)
873 {
874 unsigned char *p;
875
876 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
877 {
878 p=(unsigned char *)s->init_buf->data;
879
880 /* do the header */
881 *(p++)=SSL3_MT_SERVER_DONE;
882 *(p++)=0;
883 *(p++)=0;
884 *(p++)=0;
885
886 s->state=SSL3_ST_SW_SRVR_DONE_B;
887 /* number of bytes to write */
888 s->init_num=4;
889 s->init_off=0;
890 }
891
892 /* SSL3_ST_CW_CLNT_HELLO_B */
893 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
894 }
895
896 static int ssl3_send_server_key_exchange(SSL *s)
897 {
898 #ifndef NO_RSA
899 unsigned char *q;
900 int j,num;
901 RSA *rsa;
902 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
903 unsigned int u;
904 #endif
905 #ifndef NO_DH
906 DH *dh=NULL,*dhp;
907 #endif
908 EVP_PKEY *pkey;
909 unsigned char *p,*d;
910 int al,i;
911 unsigned long type;
912 int n;
913 CERT *cert;
914 BIGNUM *r[4];
915 int nr[4],kn;
916 BUF_MEM *buf;
917 EVP_MD_CTX md_ctx;
918
919 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
920 {
921 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
922 cert=s->cert;
923
924 buf=s->init_buf;
925
926 r[0]=r[1]=r[2]=r[3]=NULL;
927 n=0;
928 #ifndef NO_RSA
929 if (type & SSL_kRSA)
930 {
931 rsa=cert->rsa_tmp;
932 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
933 {
934 rsa=s->cert->rsa_tmp_cb(s,
935 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
936 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
937 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
938 cert->rsa_tmp=rsa;
939 }
940 if (rsa == NULL)
941 {
942 al=SSL_AD_HANDSHAKE_FAILURE;
943 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
944 goto f_err;
945 }
946 r[0]=rsa->n;
947 r[1]=rsa->e;
948 s->s3->tmp.use_rsa_tmp=1;
949 }
950 else
951 #endif
952 #ifndef NO_DH
953 if (type & SSL_kEDH)
954 {
955 dhp=cert->dh_tmp;
956 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
957 dhp=s->cert->dh_tmp_cb(s,
958 !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
959 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
960 if (dhp == NULL)
961 {
962 al=SSL_AD_HANDSHAKE_FAILURE;
963 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
964 goto f_err;
965 }
966
967 if (s->s3->tmp.dh != NULL)
968 {
969 DH_free(dh);
970 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
971 goto err;
972 }
973
974 if ((dh=DHparams_dup(dhp)) == NULL)
975 {
976 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
977 goto err;
978 }
979
980 s->s3->tmp.dh=dh;
981 if ((dhp->pub_key == NULL ||
982 dhp->priv_key == NULL ||
983 (s->options & SSL_OP_SINGLE_DH_USE)))
984 {
985 if(!DH_generate_key(dh))
986 {
987 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
988 ERR_R_DH_LIB);
989 goto err;
990 }
991 }
992 else
993 {
994 dh->pub_key=BN_dup(dhp->pub_key);
995 dh->priv_key=BN_dup(dhp->priv_key);
996 if ((dh->pub_key == NULL) ||
997 (dh->priv_key == NULL))
998 {
999 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1000 goto err;
1001 }
1002 }
1003 r[0]=dh->p;
1004 r[1]=dh->g;
1005 r[2]=dh->pub_key;
1006 }
1007 else
1008 #endif
1009 {
1010 al=SSL_AD_HANDSHAKE_FAILURE;
1011 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1012 goto f_err;
1013 }
1014 for (i=0; r[i] != NULL; i++)
1015 {
1016 nr[i]=BN_num_bytes(r[i]);
1017 n+=2+nr[i];
1018 }
1019
1020 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1021 {
1022 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1023 == NULL)
1024 {
1025 al=SSL_AD_DECODE_ERROR;
1026 goto f_err;
1027 }
1028 kn=EVP_PKEY_size(pkey);
1029 }
1030 else
1031 {
1032 pkey=NULL;
1033 kn=0;
1034 }
1035
1036 if (!BUF_MEM_grow(buf,n+4+kn))
1037 {
1038 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1039 goto err;
1040 }
1041 d=(unsigned char *)s->init_buf->data;
1042 p= &(d[4]);
1043
1044 for (i=0; r[i] != NULL; i++)
1045 {
1046 s2n(nr[i],p);
1047 BN_bn2bin(r[i],p);
1048 p+=nr[i];
1049 }
1050
1051 /* not anonymous */
1052 if (pkey != NULL)
1053 {
1054 /* n is the length of the params, they start at &(d[4])
1055 * and p points to the space at the end. */
1056 #ifndef NO_RSA
1057 if (pkey->type == EVP_PKEY_RSA)
1058 {
1059 q=md_buf;
1060 j=0;
1061 for (num=2; num > 0; num--)
1062 {
1063 EVP_DigestInit(&md_ctx,(num == 2)
1064 ?s->ctx->md5:s->ctx->sha1);
1065 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1066 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1067 EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1068 EVP_DigestFinal(&md_ctx,q,
1069 (unsigned int *)&i);
1070 q+=i;
1071 j+=i;
1072 }
1073 if (RSA_sign(NID_md5_sha1, md_buf, j,
1074 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1075 {
1076 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1077 goto err;
1078 }
1079 s2n(u,p);
1080 n+=u+2;
1081 }
1082 else
1083 #endif
1084 #if !defined(NO_DSA)
1085 if (pkey->type == EVP_PKEY_DSA)
1086 {
1087 /* lets do DSS */
1088 EVP_SignInit(&md_ctx,EVP_dss1());
1089 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1090 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1091 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1092 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1093 (unsigned int *)&i,pkey))
1094 {
1095 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1096 goto err;
1097 }
1098 s2n(i,p);
1099 n+=i+2;
1100 }
1101 else
1102 #endif
1103 {
1104 /* Is this error check actually needed? */
1105 al=SSL_AD_HANDSHAKE_FAILURE;
1106 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1107 goto f_err;
1108 }
1109 }
1110
1111 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1112 l2n3(n,d);
1113
1114 /* we should now have things packed up, so lets send
1115 * it off */
1116 s->init_num=n+4;
1117 s->init_off=0;
1118 }
1119
1120 s->state = SSL3_ST_SW_KEY_EXCH_B;
1121 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1122 f_err:
1123 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1124 err:
1125 return(-1);
1126 }
1127
1128 static int ssl3_send_certificate_request(SSL *s)
1129 {
1130 unsigned char *p,*d;
1131 int i,j,nl,off,n;
1132 STACK_OF(X509_NAME) *sk=NULL;
1133 X509_NAME *name;
1134 BUF_MEM *buf;
1135
1136 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1137 {
1138 buf=s->init_buf;
1139
1140 d=p=(unsigned char *)&(buf->data[4]);
1141
1142 /* get the list of acceptable cert types */
1143 p++;
1144 n=ssl3_get_req_cert_type(s,p);
1145 d[0]=n;
1146 p+=n;
1147 n++;
1148
1149 off=n;
1150 p+=2;
1151 n+=2;
1152
1153 sk=SSL_get_client_CA_list(s);
1154 nl=0;
1155 if (sk != NULL)
1156 {
1157 for (i=0; i<sk_X509_NAME_num(sk); i++)
1158 {
1159 name=sk_X509_NAME_value(sk,i);
1160 j=i2d_X509_NAME(name,NULL);
1161 if (!BUF_MEM_grow(buf,4+n+j+2))
1162 {
1163 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1164 goto err;
1165 }
1166 p=(unsigned char *)&(buf->data[4+n]);
1167 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1168 {
1169 s2n(j,p);
1170 i2d_X509_NAME(name,&p);
1171 n+=2+j;
1172 nl+=2+j;
1173 }
1174 else
1175 {
1176 d=p;
1177 i2d_X509_NAME(name,&p);
1178 j-=2; s2n(j,d); j+=2;
1179 n+=j;
1180 nl+=j;
1181 }
1182 }
1183 }
1184 /* else no CA names */
1185 p=(unsigned char *)&(buf->data[4+off]);
1186 s2n(nl,p);
1187
1188 d=(unsigned char *)buf->data;
1189 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1190 l2n3(n,d);
1191
1192 /* we should now have things packed up, so lets send
1193 * it off */
1194
1195 s->init_num=n+4;
1196 s->init_off=0;
1197 }
1198
1199 /* SSL3_ST_SW_CERT_REQ_B */
1200 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1201 err:
1202 return(-1);
1203 }
1204
1205 static int ssl3_get_client_key_exchange(SSL *s)
1206 {
1207 int i,al,ok;
1208 long n;
1209 unsigned long l;
1210 unsigned char *p;
1211 #ifndef NO_RSA
1212 RSA *rsa=NULL;
1213 EVP_PKEY *pkey=NULL;
1214 #endif
1215 #ifndef NO_DH
1216 BIGNUM *pub=NULL;
1217 DH *dh_srvr;
1218 #endif
1219
1220 n=ssl3_get_message(s,
1221 SSL3_ST_SR_KEY_EXCH_A,
1222 SSL3_ST_SR_KEY_EXCH_B,
1223 SSL3_MT_CLIENT_KEY_EXCHANGE,
1224 400, /* ???? */
1225 &ok);
1226
1227 if (!ok) return((int)n);
1228 p=(unsigned char *)s->init_buf->data;
1229
1230 l=s->s3->tmp.new_cipher->algorithms;
1231
1232 #ifndef NO_RSA
1233 if (l & SSL_kRSA)
1234 {
1235 /* FIX THIS UP EAY EAY EAY EAY */
1236 if (s->s3->tmp.use_rsa_tmp)
1237 {
1238 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1239 rsa=s->cert->rsa_tmp;
1240 /* Don't do a callback because rsa_tmp should
1241 * be sent already */
1242 if (rsa == NULL)
1243 {
1244 al=SSL_AD_HANDSHAKE_FAILURE;
1245 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1246 goto f_err;
1247
1248 }
1249 }
1250 else
1251 {
1252 pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1253 if ( (pkey == NULL) ||
1254 (pkey->type != EVP_PKEY_RSA) ||
1255 (pkey->pkey.rsa == NULL))
1256 {
1257 al=SSL_AD_HANDSHAKE_FAILURE;
1258 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1259 goto f_err;
1260 }
1261 rsa=pkey->pkey.rsa;
1262 }
1263
1264 /* TLS */
1265 if (s->version > SSL3_VERSION)
1266 {
1267 n2s(p,i);
1268 if (n != i+2)
1269 {
1270 if (!(s->options & SSL_OP_TLS_D5_BUG))
1271 {
1272 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1273 goto err;
1274 }
1275 else
1276 p-=2;
1277 }
1278 else
1279 n=i;
1280 }
1281
1282 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1283
1284 #if 0
1285 /* If a bad decrypt, use a random master key */
1286 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1287 ((p[0] != (s->client_version>>8)) ||
1288 (p[1] != (s->client_version & 0xff))))
1289 {
1290 int bad=1;
1291
1292 if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
1293 (p[0] == (s->version>>8)) &&
1294 (p[1] == 0))
1295 {
1296 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1297 bad=0;
1298 }
1299 if (bad)
1300 {
1301 p[0]=(s->version>>8);
1302 p[1]=(s->version & 0xff);
1303 RAND_pseudo_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1304 i=SSL_MAX_MASTER_KEY_LENGTH;
1305 }
1306 /* else, an SSLeay bug, ssl only server, tls client */
1307 }
1308 #else
1309 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1310 {
1311 al=SSL_AD_DECODE_ERROR;
1312 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1313 goto f_err;
1314 }
1315
1316 if ((p[0] != (s->client_version>>8)) || (p[1] != (s->client_version & 0xff)))
1317 {
1318 al=SSL_AD_DECODE_ERROR;
1319 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1320 goto f_err;
1321 }
1322 #endif
1323
1324 s->session->master_key_length=
1325 s->method->ssl3_enc->generate_master_secret(s,
1326 s->session->master_key,
1327 p,i);
1328 memset(p,0,i);
1329 }
1330 else
1331 #endif
1332 #ifndef NO_DH
1333 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1334 {
1335 n2s(p,i);
1336 if (n != i+2)
1337 {
1338 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1339 {
1340 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1341 goto err;
1342 }
1343 else
1344 {
1345 p-=2;
1346 i=(int)n;
1347 }
1348 }
1349
1350 if (n == 0L) /* the parameters are in the cert */
1351 {
1352 al=SSL_AD_HANDSHAKE_FAILURE;
1353 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1354 goto f_err;
1355 }
1356 else
1357 {
1358 if (s->s3->tmp.dh == NULL)
1359 {
1360 al=SSL_AD_HANDSHAKE_FAILURE;
1361 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1362 goto f_err;
1363 }
1364 else
1365 dh_srvr=s->s3->tmp.dh;
1366 }
1367
1368 pub=BN_bin2bn(p,i,NULL);
1369 if (pub == NULL)
1370 {
1371 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1372 goto err;
1373 }
1374
1375 i=DH_compute_key(p,pub,dh_srvr);
1376
1377 if (i <= 0)
1378 {
1379 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1380 goto err;
1381 }
1382
1383 DH_free(s->s3->tmp.dh);
1384 s->s3->tmp.dh=NULL;
1385
1386 BN_clear_free(pub);
1387 pub=NULL;
1388 s->session->master_key_length=
1389 s->method->ssl3_enc->generate_master_secret(s,
1390 s->session->master_key,p,i);
1391 }
1392 else
1393 #endif
1394 {
1395 al=SSL_AD_HANDSHAKE_FAILURE;
1396 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1397 goto f_err;
1398 }
1399
1400 return(1);
1401 f_err:
1402 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1403 #if !defined(NO_DH) || !defined(NO_RSA)
1404 err:
1405 #endif
1406 return(-1);
1407 }
1408
1409 static int ssl3_get_cert_verify(SSL *s)
1410 {
1411 EVP_PKEY *pkey=NULL;
1412 unsigned char *p;
1413 int al,ok,ret=0;
1414 long n;
1415 int type=0,i,j;
1416 X509 *peer;
1417
1418 n=ssl3_get_message(s,
1419 SSL3_ST_SR_CERT_VRFY_A,
1420 SSL3_ST_SR_CERT_VRFY_B,
1421 -1,
1422 512, /* 512? */
1423 &ok);
1424
1425 if (!ok) return((int)n);
1426
1427 if (s->session->peer != NULL)
1428 {
1429 peer=s->session->peer;
1430 pkey=X509_get_pubkey(peer);
1431 type=X509_certificate_type(peer,pkey);
1432 }
1433 else
1434 {
1435 peer=NULL;
1436 pkey=NULL;
1437 }
1438
1439 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1440 {
1441 s->s3->tmp.reuse_message=1;
1442 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1443 {
1444 al=SSL_AD_UNEXPECTED_MESSAGE;
1445 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1446 goto f_err;
1447 }
1448 ret=1;
1449 goto end;
1450 }
1451
1452 if (peer == NULL)
1453 {
1454 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1455 al=SSL_AD_UNEXPECTED_MESSAGE;
1456 goto f_err;
1457 }
1458
1459 if (!(type & EVP_PKT_SIGN))
1460 {
1461 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1462 al=SSL_AD_ILLEGAL_PARAMETER;
1463 goto f_err;
1464 }
1465
1466 if (s->s3->change_cipher_spec)
1467 {
1468 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1469 al=SSL_AD_UNEXPECTED_MESSAGE;
1470 goto f_err;
1471 }
1472
1473 /* we now have a signature that we need to verify */
1474 p=(unsigned char *)s->init_buf->data;
1475 n2s(p,i);
1476 n-=2;
1477 if (i > n)
1478 {
1479 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1480 al=SSL_AD_DECODE_ERROR;
1481 goto f_err;
1482 }
1483
1484 j=EVP_PKEY_size(pkey);
1485 if ((i > j) || (n > j) || (n <= 0))
1486 {
1487 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1488 al=SSL_AD_DECODE_ERROR;
1489 goto f_err;
1490 }
1491
1492 #ifndef NO_RSA
1493 if (pkey->type == EVP_PKEY_RSA)
1494 {
1495 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1496 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1497 pkey->pkey.rsa);
1498 if (i < 0)
1499 {
1500 al=SSL_AD_DECRYPT_ERROR;
1501 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1502 goto f_err;
1503 }
1504 if (i == 0)
1505 {
1506 al=SSL_AD_DECRYPT_ERROR;
1507 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1508 goto f_err;
1509 }
1510 }
1511 else
1512 #endif
1513 #ifndef NO_DSA
1514 if (pkey->type == EVP_PKEY_DSA)
1515 {
1516 j=DSA_verify(pkey->save_type,
1517 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1518 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1519 if (j <= 0)
1520 {
1521 /* bad signature */
1522 al=SSL_AD_DECRYPT_ERROR;
1523 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1524 goto f_err;
1525 }
1526 }
1527 else
1528 #endif
1529 {
1530 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1531 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1532 goto f_err;
1533 }
1534
1535
1536 ret=1;
1537 if (0)
1538 {
1539 f_err:
1540 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1541 }
1542 end:
1543 EVP_PKEY_free(pkey);
1544 return(ret);
1545 }
1546
1547 static int ssl3_get_client_certificate(SSL *s)
1548 {
1549 int i,ok,al,ret= -1;
1550 X509 *x=NULL;
1551 unsigned long l,nc,llen,n;
1552 unsigned char *p,*d,*q;
1553 STACK_OF(X509) *sk=NULL;
1554
1555 n=ssl3_get_message(s,
1556 SSL3_ST_SR_CERT_A,
1557 SSL3_ST_SR_CERT_B,
1558 -1,
1559 #if defined(MSDOS) && !defined(WIN32)
1560 1024*30, /* 30k max cert list :-) */
1561 #else
1562 1024*100, /* 100k max cert list :-) */
1563 #endif
1564 &ok);
1565
1566 if (!ok) return((int)n);
1567
1568 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1569 {
1570 if ( (s->verify_mode & SSL_VERIFY_PEER) &&
1571 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1572 {
1573 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1574 al=SSL_AD_HANDSHAKE_FAILURE;
1575 goto f_err;
1576 }
1577 /* If tls asked for a client cert, the client must return a 0 list */
1578 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1579 {
1580 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1581 al=SSL_AD_UNEXPECTED_MESSAGE;
1582 goto f_err;
1583 }
1584 s->s3->tmp.reuse_message=1;
1585 return(1);
1586 }
1587
1588 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1589 {
1590 al=SSL_AD_UNEXPECTED_MESSAGE;
1591 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1592 goto f_err;
1593 }
1594 d=p=(unsigned char *)s->init_buf->data;
1595
1596 if ((sk=sk_X509_new_null()) == NULL)
1597 {
1598 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1599 goto err;
1600 }
1601
1602 n2l3(p,llen);
1603 if (llen+3 != n)
1604 {
1605 al=SSL_AD_DECODE_ERROR;
1606 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1607 goto f_err;
1608 }
1609 for (nc=0; nc<llen; )
1610 {
1611 n2l3(p,l);
1612 if ((l+nc+3) > llen)
1613 {
1614 al=SSL_AD_DECODE_ERROR;
1615 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1616 goto f_err;
1617 }
1618
1619 q=p;
1620 x=d2i_X509(NULL,&p,l);
1621 if (x == NULL)
1622 {
1623 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1624 goto err;
1625 }
1626 if (p != (q+l))
1627 {
1628 al=SSL_AD_DECODE_ERROR;
1629 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1630 goto f_err;
1631 }
1632 if (!sk_X509_push(sk,x))
1633 {
1634 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1635 goto err;
1636 }
1637 x=NULL;
1638 nc+=l+3;
1639 }
1640
1641 if (sk_X509_num(sk) <= 0)
1642 {
1643 /* TLS does not mind 0 certs returned */
1644 if (s->version == SSL3_VERSION)
1645 {
1646 al=SSL_AD_HANDSHAKE_FAILURE;
1647 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1648 goto f_err;
1649 }
1650 /* Fail for TLS only if we required a certificate */
1651 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1652 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1653 {
1654 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1655 al=SSL_AD_HANDSHAKE_FAILURE;
1656 goto f_err;
1657 }
1658 }
1659 else
1660 {
1661 i=ssl_verify_cert_chain(s,sk);
1662 if (!i)
1663 {
1664 al=ssl_verify_alarm_type(s->verify_result);
1665 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1666 goto f_err;
1667 }
1668 }
1669
1670 if (s->session->peer != NULL) /* This should not be needed */
1671 X509_free(s->session->peer);
1672 s->session->peer=sk_X509_shift(sk);
1673 s->session->verify_result = s->verify_result;
1674
1675 /* With the current implementation, sess_cert will always be NULL
1676 * when we arrive here. */
1677 if (s->session->sess_cert == NULL)
1678 {
1679 s->session->sess_cert = ssl_sess_cert_new();
1680 if (s->session->sess_cert == NULL)
1681 {
1682 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1683 goto err;
1684 }
1685 }
1686 if (s->session->sess_cert->cert_chain != NULL)
1687 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1688 s->session->sess_cert->cert_chain=sk;
1689
1690 sk=NULL;
1691
1692 ret=1;
1693 if (0)
1694 {
1695 f_err:
1696 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1697 }
1698 err:
1699 if (x != NULL) X509_free(x);
1700 if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1701 return(ret);
1702 }
1703
1704 int ssl3_send_server_certificate(SSL *s)
1705 {
1706 unsigned long l;
1707 X509 *x;
1708
1709 if (s->state == SSL3_ST_SW_CERT_A)
1710 {
1711 x=ssl_get_server_send_cert(s);
1712 if (x == NULL)
1713 {
1714 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1715 return(0);
1716 }
1717
1718 l=ssl3_output_cert_chain(s,x);
1719 s->state=SSL3_ST_SW_CERT_B;
1720 s->init_num=(int)l;
1721 s->init_off=0;
1722 }
1723
1724 /* SSL3_ST_SW_CERT_B */
1725 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1726 }
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