Line data Source code
1 : /* ssl/d1_srvr.c */
2 : /*
3 : * DTLS implementation written by Nagendra Modadugu
4 : * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5 : */
6 : /* ====================================================================
7 : * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
8 : *
9 : * Redistribution and use in source and binary forms, with or without
10 : * modification, are permitted provided that the following conditions
11 : * are met:
12 : *
13 : * 1. Redistributions of source code must retain the above copyright
14 : * notice, this list of conditions and the following disclaimer.
15 : *
16 : * 2. Redistributions in binary form must reproduce the above copyright
17 : * notice, this list of conditions and the following disclaimer in
18 : * the documentation and/or other materials provided with the
19 : * distribution.
20 : *
21 : * 3. All advertising materials mentioning features or use of this
22 : * software must display the following acknowledgment:
23 : * "This product includes software developed by the OpenSSL Project
24 : * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 : *
26 : * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 : * endorse or promote products derived from this software without
28 : * prior written permission. For written permission, please contact
29 : * openssl-core@OpenSSL.org.
30 : *
31 : * 5. Products derived from this software may not be called "OpenSSL"
32 : * nor may "OpenSSL" appear in their names without prior written
33 : * permission of the OpenSSL Project.
34 : *
35 : * 6. Redistributions of any form whatsoever must retain the following
36 : * acknowledgment:
37 : * "This product includes software developed by the OpenSSL Project
38 : * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 : *
40 : * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 : * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 : * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 : * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 : * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 : * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 : * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 : * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 : * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 : * OF THE POSSIBILITY OF SUCH DAMAGE.
52 : * ====================================================================
53 : *
54 : * This product includes cryptographic software written by Eric Young
55 : * (eay@cryptsoft.com). This product includes software written by Tim
56 : * Hudson (tjh@cryptsoft.com).
57 : *
58 : */
59 : /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 : * All rights reserved.
61 : *
62 : * This package is an SSL implementation written
63 : * by Eric Young (eay@cryptsoft.com).
64 : * The implementation was written so as to conform with Netscapes SSL.
65 : *
66 : * This library is free for commercial and non-commercial use as long as
67 : * the following conditions are aheared to. The following conditions
68 : * apply to all code found in this distribution, be it the RC4, RSA,
69 : * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70 : * included with this distribution is covered by the same copyright terms
71 : * except that the holder is Tim Hudson (tjh@cryptsoft.com).
72 : *
73 : * Copyright remains Eric Young's, and as such any Copyright notices in
74 : * the code are not to be removed.
75 : * If this package is used in a product, Eric Young should be given attribution
76 : * as the author of the parts of the library used.
77 : * This can be in the form of a textual message at program startup or
78 : * in documentation (online or textual) provided with the package.
79 : *
80 : * Redistribution and use in source and binary forms, with or without
81 : * modification, are permitted provided that the following conditions
82 : * are met:
83 : * 1. Redistributions of source code must retain the copyright
84 : * notice, this list of conditions and the following disclaimer.
85 : * 2. Redistributions in binary form must reproduce the above copyright
86 : * notice, this list of conditions and the following disclaimer in the
87 : * documentation and/or other materials provided with the distribution.
88 : * 3. All advertising materials mentioning features or use of this software
89 : * must display the following acknowledgement:
90 : * "This product includes cryptographic software written by
91 : * Eric Young (eay@cryptsoft.com)"
92 : * The word 'cryptographic' can be left out if the rouines from the library
93 : * being used are not cryptographic related :-).
94 : * 4. If you include any Windows specific code (or a derivative thereof) from
95 : * the apps directory (application code) you must include an acknowledgement:
96 : * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
97 : *
98 : * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101 : * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
108 : * SUCH DAMAGE.
109 : *
110 : * The licence and distribution terms for any publically available version or
111 : * derivative of this code cannot be changed. i.e. this code cannot simply be
112 : * copied and put under another distribution licence
113 : * [including the GNU Public Licence.]
114 : */
115 :
116 : #include <stdio.h>
117 : #include "ssl_locl.h"
118 : #include <openssl/buffer.h>
119 : #include <openssl/rand.h>
120 : #include <openssl/objects.h>
121 : #include <openssl/evp.h>
122 : #include <openssl/x509.h>
123 : #include <openssl/md5.h>
124 : #include <openssl/bn.h>
125 : #ifndef OPENSSL_NO_DH
126 : # include <openssl/dh.h>
127 : #endif
128 :
129 : static const SSL_METHOD *dtls1_get_server_method(int ver);
130 : static int dtls1_send_hello_verify_request(SSL *s);
131 :
132 0 : static const SSL_METHOD *dtls1_get_server_method(int ver)
133 : {
134 0 : if (ver == DTLS1_VERSION)
135 : return (DTLSv1_server_method());
136 0 : else if (ver == DTLS1_2_VERSION)
137 : return (DTLSv1_2_server_method());
138 : else
139 0 : return (NULL);
140 : }
141 :
142 0 : IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
143 : DTLSv1_server_method,
144 : dtls1_accept,
145 : ssl_undefined_function,
146 : dtls1_get_server_method, DTLSv1_enc_data)
147 :
148 0 : IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
149 : DTLSv1_2_server_method,
150 : dtls1_accept,
151 : ssl_undefined_function,
152 : dtls1_get_server_method, DTLSv1_2_enc_data)
153 :
154 0 : IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
155 : DTLS_server_method,
156 : dtls1_accept,
157 : ssl_undefined_function,
158 : dtls1_get_server_method, DTLSv1_2_enc_data)
159 :
160 0 : int dtls1_accept(SSL *s)
161 : {
162 : BUF_MEM *buf;
163 0 : unsigned long Time = (unsigned long)time(NULL);
164 : void (*cb) (const SSL *ssl, int type, int val) = NULL;
165 : unsigned long alg_k;
166 : int ret = -1;
167 : int new_state, state, skip = 0;
168 : int listen;
169 : #ifndef OPENSSL_NO_SCTP
170 : unsigned char sctpauthkey[64];
171 : char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
172 : #endif
173 :
174 0 : RAND_add(&Time, sizeof(Time), 0);
175 0 : ERR_clear_error();
176 0 : clear_sys_error();
177 :
178 0 : if (s->info_callback != NULL)
179 : cb = s->info_callback;
180 0 : else if (s->ctx->info_callback != NULL)
181 : cb = s->ctx->info_callback;
182 :
183 0 : listen = s->d1->listen;
184 :
185 : /* init things to blank */
186 0 : s->in_handshake++;
187 0 : if (!SSL_in_init(s) || SSL_in_before(s))
188 0 : SSL_clear(s);
189 :
190 0 : s->d1->listen = listen;
191 : #ifndef OPENSSL_NO_SCTP
192 : /*
193 : * Notify SCTP BIO socket to enter handshake mode and prevent stream
194 : * identifier other than 0. Will be ignored if no SCTP is used.
195 : */
196 : BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
197 : s->in_handshake, NULL);
198 : #endif
199 :
200 0 : if (s->cert == NULL) {
201 0 : SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
202 0 : return (-1);
203 : }
204 : #ifndef OPENSSL_NO_HEARTBEATS
205 : /*
206 : * If we're awaiting a HeartbeatResponse, pretend we already got and
207 : * don't await it anymore, because Heartbeats don't make sense during
208 : * handshakes anyway.
209 : */
210 0 : if (s->tlsext_hb_pending) {
211 0 : dtls1_stop_timer(s);
212 0 : s->tlsext_hb_pending = 0;
213 0 : s->tlsext_hb_seq++;
214 : }
215 : #endif
216 :
217 : for (;;) {
218 0 : state = s->state;
219 :
220 0 : switch (s->state) {
221 : case SSL_ST_RENEGOTIATE:
222 0 : s->renegotiate = 1;
223 : /* s->state=SSL_ST_ACCEPT; */
224 :
225 : case SSL_ST_BEFORE:
226 : case SSL_ST_ACCEPT:
227 : case SSL_ST_BEFORE | SSL_ST_ACCEPT:
228 : case SSL_ST_OK | SSL_ST_ACCEPT:
229 :
230 0 : s->server = 1;
231 0 : if (cb != NULL)
232 0 : cb(s, SSL_CB_HANDSHAKE_START, 1);
233 :
234 0 : if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
235 0 : SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
236 0 : return -1;
237 : }
238 0 : s->type = SSL_ST_ACCEPT;
239 :
240 0 : if (s->init_buf == NULL) {
241 0 : if ((buf = BUF_MEM_new()) == NULL) {
242 : ret = -1;
243 0 : s->state = SSL_ST_ERR;
244 0 : goto end;
245 : }
246 0 : if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
247 0 : BUF_MEM_free(buf);
248 : ret = -1;
249 0 : s->state = SSL_ST_ERR;
250 0 : goto end;
251 : }
252 0 : s->init_buf = buf;
253 : }
254 :
255 0 : if (!ssl3_setup_buffers(s)) {
256 : ret = -1;
257 0 : s->state = SSL_ST_ERR;
258 0 : goto end;
259 : }
260 :
261 0 : s->init_num = 0;
262 0 : s->d1->change_cipher_spec_ok = 0;
263 : /*
264 : * Should have been reset by ssl3_get_finished, too.
265 : */
266 0 : s->s3->change_cipher_spec = 0;
267 :
268 0 : if (s->state != SSL_ST_RENEGOTIATE) {
269 : /*
270 : * Ok, we now need to push on a buffering BIO so that the
271 : * output is sent in a way that TCP likes :-) ...but not with
272 : * SCTP :-)
273 : */
274 : #ifndef OPENSSL_NO_SCTP
275 : if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
276 : #endif
277 0 : if (!ssl_init_wbio_buffer(s, 1)) {
278 : ret = -1;
279 0 : s->state = SSL_ST_ERR;
280 0 : goto end;
281 : }
282 :
283 0 : ssl3_init_finished_mac(s);
284 0 : s->state = SSL3_ST_SR_CLNT_HELLO_A;
285 0 : s->ctx->stats.sess_accept++;
286 : } else {
287 : /*
288 : * s->state == SSL_ST_RENEGOTIATE, we will just send a
289 : * HelloRequest
290 : */
291 0 : s->ctx->stats.sess_accept_renegotiate++;
292 0 : s->state = SSL3_ST_SW_HELLO_REQ_A;
293 : }
294 :
295 : break;
296 :
297 : case SSL3_ST_SW_HELLO_REQ_A:
298 : case SSL3_ST_SW_HELLO_REQ_B:
299 :
300 0 : s->shutdown = 0;
301 0 : dtls1_clear_record_buffer(s);
302 0 : dtls1_start_timer(s);
303 0 : ret = ssl3_send_hello_request(s);
304 0 : if (ret <= 0)
305 : goto end;
306 0 : s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
307 0 : s->state = SSL3_ST_SW_FLUSH;
308 0 : s->init_num = 0;
309 :
310 0 : ssl3_init_finished_mac(s);
311 0 : break;
312 :
313 : case SSL3_ST_SW_HELLO_REQ_C:
314 0 : s->state = SSL_ST_OK;
315 0 : break;
316 :
317 : case SSL3_ST_SR_CLNT_HELLO_A:
318 : case SSL3_ST_SR_CLNT_HELLO_B:
319 : case SSL3_ST_SR_CLNT_HELLO_C:
320 :
321 0 : s->shutdown = 0;
322 0 : ret = ssl3_get_client_hello(s);
323 0 : if (ret <= 0)
324 : goto end;
325 0 : dtls1_stop_timer(s);
326 :
327 0 : if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
328 0 : s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
329 : else
330 0 : s->state = SSL3_ST_SW_SRVR_HELLO_A;
331 :
332 0 : s->init_num = 0;
333 :
334 : /*
335 : * Reflect ClientHello sequence to remain stateless while
336 : * listening
337 : */
338 0 : if (listen) {
339 0 : memcpy(s->s3->write_sequence, s->s3->read_sequence,
340 : sizeof(s->s3->write_sequence));
341 : }
342 :
343 : /* If we're just listening, stop here */
344 0 : if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
345 : ret = 2;
346 0 : s->d1->listen = 0;
347 : /*
348 : * Set expected sequence numbers to continue the handshake.
349 : */
350 0 : s->d1->handshake_read_seq = 2;
351 0 : s->d1->handshake_write_seq = 1;
352 0 : s->d1->next_handshake_write_seq = 1;
353 0 : goto end;
354 : }
355 :
356 : break;
357 :
358 : case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
359 : case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
360 :
361 0 : ret = dtls1_send_hello_verify_request(s);
362 0 : if (ret <= 0)
363 : goto end;
364 0 : s->state = SSL3_ST_SW_FLUSH;
365 0 : s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
366 :
367 : /* HelloVerifyRequest resets Finished MAC */
368 0 : if (s->version != DTLS1_BAD_VER)
369 0 : ssl3_init_finished_mac(s);
370 : break;
371 :
372 : #ifndef OPENSSL_NO_SCTP
373 : case DTLS1_SCTP_ST_SR_READ_SOCK:
374 :
375 : if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
376 : s->s3->in_read_app_data = 2;
377 : s->rwstate = SSL_READING;
378 : BIO_clear_retry_flags(SSL_get_rbio(s));
379 : BIO_set_retry_read(SSL_get_rbio(s));
380 : ret = -1;
381 : goto end;
382 : }
383 :
384 : s->state = SSL3_ST_SR_FINISHED_A;
385 : break;
386 :
387 : case DTLS1_SCTP_ST_SW_WRITE_SOCK:
388 : ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
389 : if (ret < 0)
390 : goto end;
391 :
392 : if (ret == 0) {
393 : if (s->d1->next_state != SSL_ST_OK) {
394 : s->s3->in_read_app_data = 2;
395 : s->rwstate = SSL_READING;
396 : BIO_clear_retry_flags(SSL_get_rbio(s));
397 : BIO_set_retry_read(SSL_get_rbio(s));
398 : ret = -1;
399 : goto end;
400 : }
401 : }
402 :
403 : s->state = s->d1->next_state;
404 : break;
405 : #endif
406 :
407 : case SSL3_ST_SW_SRVR_HELLO_A:
408 : case SSL3_ST_SW_SRVR_HELLO_B:
409 0 : s->renegotiate = 2;
410 0 : dtls1_start_timer(s);
411 0 : ret = ssl3_send_server_hello(s);
412 0 : if (ret <= 0)
413 : goto end;
414 :
415 0 : if (s->hit) {
416 : #ifndef OPENSSL_NO_SCTP
417 : /*
418 : * Add new shared key for SCTP-Auth, will be ignored if no
419 : * SCTP used.
420 : */
421 : snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
422 : DTLS1_SCTP_AUTH_LABEL);
423 :
424 : SSL_export_keying_material(s, sctpauthkey,
425 : sizeof(sctpauthkey), labelbuffer,
426 : sizeof(labelbuffer), NULL, 0, 0);
427 :
428 : BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
429 : sizeof(sctpauthkey), sctpauthkey);
430 : #endif
431 : #ifndef OPENSSL_NO_TLSEXT
432 0 : if (s->tlsext_ticket_expected)
433 0 : s->state = SSL3_ST_SW_SESSION_TICKET_A;
434 : else
435 0 : s->state = SSL3_ST_SW_CHANGE_A;
436 : #else
437 : s->state = SSL3_ST_SW_CHANGE_A;
438 : #endif
439 : } else
440 0 : s->state = SSL3_ST_SW_CERT_A;
441 0 : s->init_num = 0;
442 0 : break;
443 :
444 : case SSL3_ST_SW_CERT_A:
445 : case SSL3_ST_SW_CERT_B:
446 : /* Check if it is anon DH or normal PSK */
447 0 : if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
448 0 : && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
449 0 : dtls1_start_timer(s);
450 0 : ret = ssl3_send_server_certificate(s);
451 0 : if (ret <= 0)
452 : goto end;
453 : #ifndef OPENSSL_NO_TLSEXT
454 0 : if (s->tlsext_status_expected)
455 0 : s->state = SSL3_ST_SW_CERT_STATUS_A;
456 : else
457 0 : s->state = SSL3_ST_SW_KEY_EXCH_A;
458 : } else {
459 : skip = 1;
460 0 : s->state = SSL3_ST_SW_KEY_EXCH_A;
461 : }
462 : #else
463 : } else
464 : skip = 1;
465 :
466 : s->state = SSL3_ST_SW_KEY_EXCH_A;
467 : #endif
468 0 : s->init_num = 0;
469 0 : break;
470 :
471 : case SSL3_ST_SW_KEY_EXCH_A:
472 : case SSL3_ST_SW_KEY_EXCH_B:
473 0 : alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
474 :
475 : /*
476 : * clear this, it may get reset by
477 : * send_server_key_exchange
478 : */
479 0 : s->s3->tmp.use_rsa_tmp = 0;
480 :
481 : /*
482 : * only send if a DH key exchange or RSA but we have a sign only
483 : * certificate
484 : */
485 0 : if (0
486 : /*
487 : * PSK: send ServerKeyExchange if PSK identity hint if
488 : * provided
489 : */
490 : #ifndef OPENSSL_NO_PSK
491 0 : || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
492 : #endif
493 : || (alg_k & SSL_kDHE)
494 0 : || (alg_k & SSL_kEECDH)
495 0 : || ((alg_k & SSL_kRSA)
496 0 : && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
497 0 : || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
498 0 : && EVP_PKEY_size(s->cert->pkeys
499 0 : [SSL_PKEY_RSA_ENC].privatekey) *
500 0 : 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
501 : )
502 : )
503 : )
504 : ) {
505 0 : dtls1_start_timer(s);
506 0 : ret = ssl3_send_server_key_exchange(s);
507 0 : if (ret <= 0)
508 : goto end;
509 : } else
510 : skip = 1;
511 :
512 0 : s->state = SSL3_ST_SW_CERT_REQ_A;
513 0 : s->init_num = 0;
514 0 : break;
515 :
516 : case SSL3_ST_SW_CERT_REQ_A:
517 : case SSL3_ST_SW_CERT_REQ_B:
518 0 : if ( /* don't request cert unless asked for it: */
519 0 : !(s->verify_mode & SSL_VERIFY_PEER) ||
520 : /*
521 : * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
522 : * during re-negotiation:
523 : */
524 0 : ((s->session->peer != NULL) &&
525 0 : (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
526 : /*
527 : * never request cert in anonymous ciphersuites (see
528 : * section "Certificate request" in SSL 3 drafts and in
529 : * RFC 2246):
530 : */
531 0 : ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
532 : /*
533 : * ... except when the application insists on
534 : * verification (against the specs, but s3_clnt.c accepts
535 : * this for SSL 3)
536 : */
537 0 : !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
538 : /*
539 : * never request cert in Kerberos ciphersuites
540 : */
541 0 : (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
542 : /*
543 : * With normal PSK Certificates and Certificate Requests
544 : * are omitted
545 : */
546 0 : || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
547 : /* no cert request */
548 : skip = 1;
549 0 : s->s3->tmp.cert_request = 0;
550 0 : s->state = SSL3_ST_SW_SRVR_DONE_A;
551 : #ifndef OPENSSL_NO_SCTP
552 : if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
553 : s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
554 : s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
555 : }
556 : #endif
557 : } else {
558 0 : s->s3->tmp.cert_request = 1;
559 0 : dtls1_start_timer(s);
560 0 : ret = ssl3_send_certificate_request(s);
561 0 : if (ret <= 0)
562 : goto end;
563 : #ifndef NETSCAPE_HANG_BUG
564 0 : s->state = SSL3_ST_SW_SRVR_DONE_A;
565 : # ifndef OPENSSL_NO_SCTP
566 : if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
567 : s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
568 : s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
569 : }
570 : # endif
571 : #else
572 : s->state = SSL3_ST_SW_FLUSH;
573 : s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
574 : # ifndef OPENSSL_NO_SCTP
575 : if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
576 : s->d1->next_state = s->s3->tmp.next_state;
577 : s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
578 : }
579 : # endif
580 : #endif
581 0 : s->init_num = 0;
582 : }
583 : break;
584 :
585 : case SSL3_ST_SW_SRVR_DONE_A:
586 : case SSL3_ST_SW_SRVR_DONE_B:
587 0 : dtls1_start_timer(s);
588 0 : ret = ssl3_send_server_done(s);
589 0 : if (ret <= 0)
590 : goto end;
591 0 : s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
592 0 : s->state = SSL3_ST_SW_FLUSH;
593 0 : s->init_num = 0;
594 0 : break;
595 :
596 : case SSL3_ST_SW_FLUSH:
597 0 : s->rwstate = SSL_WRITING;
598 0 : if (BIO_flush(s->wbio) <= 0) {
599 : /*
600 : * If the write error was fatal, stop trying
601 : */
602 0 : if (!BIO_should_retry(s->wbio)) {
603 0 : s->rwstate = SSL_NOTHING;
604 0 : s->state = s->s3->tmp.next_state;
605 : }
606 :
607 : ret = -1;
608 : goto end;
609 : }
610 0 : s->rwstate = SSL_NOTHING;
611 0 : s->state = s->s3->tmp.next_state;
612 0 : break;
613 :
614 : case SSL3_ST_SR_CERT_A:
615 : case SSL3_ST_SR_CERT_B:
616 0 : if (s->s3->tmp.cert_request) {
617 0 : ret = ssl3_get_client_certificate(s);
618 0 : if (ret <= 0)
619 : goto end;
620 : }
621 0 : s->init_num = 0;
622 0 : s->state = SSL3_ST_SR_KEY_EXCH_A;
623 0 : break;
624 :
625 : case SSL3_ST_SR_KEY_EXCH_A:
626 : case SSL3_ST_SR_KEY_EXCH_B:
627 0 : ret = ssl3_get_client_key_exchange(s);
628 0 : if (ret <= 0)
629 : goto end;
630 : #ifndef OPENSSL_NO_SCTP
631 : /*
632 : * Add new shared key for SCTP-Auth, will be ignored if no SCTP
633 : * used.
634 : */
635 : snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
636 : DTLS1_SCTP_AUTH_LABEL);
637 :
638 : SSL_export_keying_material(s, sctpauthkey,
639 : sizeof(sctpauthkey), labelbuffer,
640 : sizeof(labelbuffer), NULL, 0, 0);
641 :
642 : BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
643 : sizeof(sctpauthkey), sctpauthkey);
644 : #endif
645 :
646 0 : s->state = SSL3_ST_SR_CERT_VRFY_A;
647 0 : s->init_num = 0;
648 :
649 0 : if (ret == 2) {
650 : /*
651 : * For the ECDH ciphersuites when the client sends its ECDH
652 : * pub key in a certificate, the CertificateVerify message is
653 : * not sent.
654 : */
655 0 : s->state = SSL3_ST_SR_FINISHED_A;
656 : s->init_num = 0;
657 0 : } else if (SSL_USE_SIGALGS(s)) {
658 : s->state = SSL3_ST_SR_CERT_VRFY_A;
659 : s->init_num = 0;
660 0 : if (!s->session->peer)
661 : break;
662 : /*
663 : * For sigalgs freeze the handshake buffer at this point and
664 : * digest cached records.
665 : */
666 0 : if (!s->s3->handshake_buffer) {
667 0 : SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
668 0 : s->state = SSL_ST_ERR;
669 0 : return -1;
670 : }
671 0 : s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
672 0 : if (!ssl3_digest_cached_records(s)) {
673 0 : s->state = SSL_ST_ERR;
674 0 : return -1;
675 : }
676 : } else {
677 : s->state = SSL3_ST_SR_CERT_VRFY_A;
678 : s->init_num = 0;
679 :
680 : /*
681 : * We need to get hashes here so if there is a client cert,
682 : * it can be verified
683 : */
684 0 : s->method->ssl3_enc->cert_verify_mac(s,
685 : NID_md5,
686 0 : &(s->s3->
687 : tmp.cert_verify_md
688 : [0]));
689 0 : s->method->ssl3_enc->cert_verify_mac(s, NID_sha1,
690 0 : &(s->s3->
691 : tmp.cert_verify_md
692 : [MD5_DIGEST_LENGTH]));
693 : }
694 : break;
695 :
696 : case SSL3_ST_SR_CERT_VRFY_A:
697 : case SSL3_ST_SR_CERT_VRFY_B:
698 0 : ret = ssl3_get_cert_verify(s);
699 0 : if (ret <= 0)
700 : goto end;
701 : #ifndef OPENSSL_NO_SCTP
702 : if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
703 : state == SSL_ST_RENEGOTIATE)
704 : s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
705 : else
706 : #endif
707 0 : s->state = SSL3_ST_SR_FINISHED_A;
708 0 : s->init_num = 0;
709 0 : break;
710 :
711 : case SSL3_ST_SR_FINISHED_A:
712 : case SSL3_ST_SR_FINISHED_B:
713 : /*
714 : * Enable CCS. Receiving a CCS clears the flag, so make
715 : * sure not to re-enable it to ban duplicates. This *should* be the
716 : * first time we have received one - but we check anyway to be
717 : * cautious.
718 : * s->s3->change_cipher_spec is set when a CCS is
719 : * processed in d1_pkt.c, and remains set until
720 : * the client's Finished message is read.
721 : */
722 0 : if (!s->s3->change_cipher_spec)
723 0 : s->d1->change_cipher_spec_ok = 1;
724 0 : ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
725 : SSL3_ST_SR_FINISHED_B);
726 0 : if (ret <= 0)
727 : goto end;
728 0 : dtls1_stop_timer(s);
729 0 : if (s->hit)
730 0 : s->state = SSL_ST_OK;
731 : #ifndef OPENSSL_NO_TLSEXT
732 0 : else if (s->tlsext_ticket_expected)
733 0 : s->state = SSL3_ST_SW_SESSION_TICKET_A;
734 : #endif
735 : else
736 0 : s->state = SSL3_ST_SW_CHANGE_A;
737 0 : s->init_num = 0;
738 0 : break;
739 :
740 : #ifndef OPENSSL_NO_TLSEXT
741 : case SSL3_ST_SW_SESSION_TICKET_A:
742 : case SSL3_ST_SW_SESSION_TICKET_B:
743 0 : ret = ssl3_send_newsession_ticket(s);
744 0 : if (ret <= 0)
745 : goto end;
746 0 : s->state = SSL3_ST_SW_CHANGE_A;
747 0 : s->init_num = 0;
748 0 : break;
749 :
750 : case SSL3_ST_SW_CERT_STATUS_A:
751 : case SSL3_ST_SW_CERT_STATUS_B:
752 0 : ret = ssl3_send_cert_status(s);
753 0 : if (ret <= 0)
754 : goto end;
755 0 : s->state = SSL3_ST_SW_KEY_EXCH_A;
756 0 : s->init_num = 0;
757 0 : break;
758 :
759 : #endif
760 :
761 : case SSL3_ST_SW_CHANGE_A:
762 : case SSL3_ST_SW_CHANGE_B:
763 :
764 0 : s->session->cipher = s->s3->tmp.new_cipher;
765 0 : if (!s->method->ssl3_enc->setup_key_block(s)) {
766 : ret = -1;
767 0 : s->state = SSL_ST_ERR;
768 0 : goto end;
769 : }
770 :
771 0 : ret = dtls1_send_change_cipher_spec(s,
772 : SSL3_ST_SW_CHANGE_A,
773 : SSL3_ST_SW_CHANGE_B);
774 :
775 0 : if (ret <= 0)
776 : goto end;
777 :
778 : #ifndef OPENSSL_NO_SCTP
779 : if (!s->hit) {
780 : /*
781 : * Change to new shared key of SCTP-Auth, will be ignored if
782 : * no SCTP used.
783 : */
784 : BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
785 : 0, NULL);
786 : }
787 : #endif
788 :
789 0 : s->state = SSL3_ST_SW_FINISHED_A;
790 0 : s->init_num = 0;
791 :
792 0 : if (!s->method->ssl3_enc->change_cipher_state(s,
793 : SSL3_CHANGE_CIPHER_SERVER_WRITE))
794 : {
795 : ret = -1;
796 0 : s->state = SSL_ST_ERR;
797 0 : goto end;
798 : }
799 :
800 0 : dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
801 0 : break;
802 :
803 : case SSL3_ST_SW_FINISHED_A:
804 : case SSL3_ST_SW_FINISHED_B:
805 0 : ret = ssl3_send_finished(s,
806 : SSL3_ST_SW_FINISHED_A,
807 : SSL3_ST_SW_FINISHED_B,
808 : s->method->
809 : ssl3_enc->server_finished_label,
810 0 : s->method->
811 : ssl3_enc->server_finished_label_len);
812 0 : if (ret <= 0)
813 : goto end;
814 0 : s->state = SSL3_ST_SW_FLUSH;
815 0 : if (s->hit) {
816 0 : s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
817 :
818 : #ifndef OPENSSL_NO_SCTP
819 : /*
820 : * Change to new shared key of SCTP-Auth, will be ignored if
821 : * no SCTP used.
822 : */
823 : BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
824 : 0, NULL);
825 : #endif
826 : } else {
827 0 : s->s3->tmp.next_state = SSL_ST_OK;
828 : #ifndef OPENSSL_NO_SCTP
829 : if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
830 : s->d1->next_state = s->s3->tmp.next_state;
831 : s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
832 : }
833 : #endif
834 : }
835 0 : s->init_num = 0;
836 0 : break;
837 :
838 : case SSL_ST_OK:
839 : /* clean a few things up */
840 0 : ssl3_cleanup_key_block(s);
841 :
842 : #if 0
843 : BUF_MEM_free(s->init_buf);
844 : s->init_buf = NULL;
845 : #endif
846 :
847 : /* remove buffering on output */
848 0 : ssl_free_wbio_buffer(s);
849 :
850 0 : s->init_num = 0;
851 :
852 0 : if (s->renegotiate == 2) { /* skipped if we just sent a
853 : * HelloRequest */
854 0 : s->renegotiate = 0;
855 0 : s->new_session = 0;
856 :
857 0 : ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
858 :
859 0 : s->ctx->stats.sess_accept_good++;
860 : /* s->server=1; */
861 0 : s->handshake_func = dtls1_accept;
862 :
863 0 : if (cb != NULL)
864 0 : cb(s, SSL_CB_HANDSHAKE_DONE, 1);
865 : }
866 :
867 : ret = 1;
868 :
869 : /* done handshaking, next message is client hello */
870 0 : s->d1->handshake_read_seq = 0;
871 : /* next message is server hello */
872 0 : s->d1->handshake_write_seq = 0;
873 0 : s->d1->next_handshake_write_seq = 0;
874 0 : goto end;
875 : /* break; */
876 :
877 : case SSL_ST_ERR:
878 : default:
879 0 : SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
880 : ret = -1;
881 0 : goto end;
882 : /* break; */
883 : }
884 :
885 0 : if (!s->s3->tmp.reuse_message && !skip) {
886 0 : if (s->debug) {
887 0 : if ((ret = BIO_flush(s->wbio)) <= 0)
888 : goto end;
889 : }
890 :
891 0 : if ((cb != NULL) && (s->state != state)) {
892 : new_state = s->state;
893 0 : s->state = state;
894 0 : cb(s, SSL_CB_ACCEPT_LOOP, 1);
895 0 : s->state = new_state;
896 : }
897 : }
898 : skip = 0;
899 : }
900 : end:
901 : /* BIO_flush(s->wbio); */
902 :
903 0 : s->in_handshake--;
904 : #ifndef OPENSSL_NO_SCTP
905 : /*
906 : * Notify SCTP BIO socket to leave handshake mode and prevent stream
907 : * identifier other than 0. Will be ignored if no SCTP is used.
908 : */
909 : BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
910 : s->in_handshake, NULL);
911 : #endif
912 :
913 0 : if (cb != NULL)
914 0 : cb(s, SSL_CB_ACCEPT_EXIT, ret);
915 0 : return (ret);
916 : }
917 :
918 0 : int dtls1_send_hello_verify_request(SSL *s)
919 : {
920 : unsigned int msg_len;
921 : unsigned char *msg, *buf, *p;
922 :
923 0 : if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
924 0 : buf = (unsigned char *)s->init_buf->data;
925 :
926 0 : msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
927 : /* Always use DTLS 1.0 version: see RFC 6347 */
928 0 : *(p++) = DTLS1_VERSION >> 8;
929 0 : *(p++) = DTLS1_VERSION & 0xFF;
930 :
931 0 : if (s->ctx->app_gen_cookie_cb == NULL ||
932 0 : s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
933 0 : &(s->d1->cookie_len)) == 0) {
934 0 : SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
935 : ERR_R_INTERNAL_ERROR);
936 0 : s->state = SSL_ST_ERR;
937 0 : return 0;
938 : }
939 :
940 0 : *(p++) = (unsigned char)s->d1->cookie_len;
941 0 : memcpy(p, s->d1->cookie, s->d1->cookie_len);
942 0 : p += s->d1->cookie_len;
943 0 : msg_len = p - msg;
944 :
945 0 : dtls1_set_message_header(s, buf,
946 : DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0,
947 : msg_len);
948 :
949 0 : s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
950 : /* number of bytes to write */
951 0 : s->init_num = p - buf;
952 0 : s->init_off = 0;
953 : }
954 :
955 : /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
956 0 : return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
957 : }
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