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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 static const SSL_METHOD *dtls1_get_server_method(int ver) | |
133 { | |
134 if (ver == DTLS1_VERSION) | |
135 return(DTLSv1_server_method()); | |
136 else | |
137 return(NULL); | |
138 } | |
139 | |
140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method, | |
141 dtls1_accept, | |
142 ssl_undefined_function, | |
143 dtls1_get_server_method) | |
144 | |
145 int dtls1_accept(SSL *s) | |
146 { | |
147 BUF_MEM *buf; | |
148 unsigned long Time=(unsigned long)time(NULL); | |
149 void (*cb)(const SSL *ssl,int type,int val)=NULL; | |
150 unsigned long alg_k; | |
151 int ret= -1; | |
152 int new_state,state,skip=0; | |
153 int listen; | |
154 #ifndef OPENSSL_NO_SCTP | |
155 unsigned char sctpauthkey[64]; | |
156 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
157 #endif | |
158 | |
159 RAND_add(&Time,sizeof(Time),0); | |
160 ERR_clear_error(); | |
161 clear_sys_error(); | |
162 | |
163 if (s->info_callback != NULL) | |
164 cb=s->info_callback; | |
165 else if (s->ctx->info_callback != NULL) | |
166 cb=s->ctx->info_callback; | |
167 | |
168 listen = s->d1->listen; | |
169 | |
170 /* init things to blank */ | |
171 s->in_handshake++; | |
172 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); | |
173 | |
174 s->d1->listen = listen; | |
175 #ifndef OPENSSL_NO_SCTP | |
176 /* Notify SCTP BIO socket to enter handshake | |
177 * mode and prevent stream identifier other | |
178 * than 0. Will be ignored if no SCTP is used. | |
179 */ | |
180 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_ha
ndshake, NULL); | |
181 #endif | |
182 | |
183 if (s->cert == NULL) | |
184 { | |
185 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET); | |
186 return(-1); | |
187 } | |
188 | |
189 #ifndef OPENSSL_NO_HEARTBEATS | |
190 /* If we're awaiting a HeartbeatResponse, pretend we | |
191 * already got and don't await it anymore, because | |
192 * Heartbeats don't make sense during handshakes anyway. | |
193 */ | |
194 if (s->tlsext_hb_pending) | |
195 { | |
196 dtls1_stop_timer(s); | |
197 s->tlsext_hb_pending = 0; | |
198 s->tlsext_hb_seq++; | |
199 } | |
200 #endif | |
201 | |
202 for (;;) | |
203 { | |
204 state=s->state; | |
205 | |
206 switch (s->state) | |
207 { | |
208 case SSL_ST_RENEGOTIATE: | |
209 s->renegotiate=1; | |
210 /* s->state=SSL_ST_ACCEPT; */ | |
211 | |
212 case SSL_ST_BEFORE: | |
213 case SSL_ST_ACCEPT: | |
214 case SSL_ST_BEFORE|SSL_ST_ACCEPT: | |
215 case SSL_ST_OK|SSL_ST_ACCEPT: | |
216 | |
217 s->server=1; | |
218 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); | |
219 | |
220 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) | |
221 { | |
222 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR)
; | |
223 return -1; | |
224 } | |
225 s->type=SSL_ST_ACCEPT; | |
226 | |
227 if (s->init_buf == NULL) | |
228 { | |
229 if ((buf=BUF_MEM_new()) == NULL) | |
230 { | |
231 ret= -1; | |
232 goto end; | |
233 } | |
234 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) | |
235 { | |
236 ret= -1; | |
237 goto end; | |
238 } | |
239 s->init_buf=buf; | |
240 } | |
241 | |
242 if (!ssl3_setup_buffers(s)) | |
243 { | |
244 ret= -1; | |
245 goto end; | |
246 } | |
247 | |
248 s->init_num=0; | |
249 | |
250 if (s->state != SSL_ST_RENEGOTIATE) | |
251 { | |
252 /* Ok, we now need to push on a buffering BIO so
that | |
253 * the output is sent in a way that TCP likes :-
) | |
254 * ...but not with SCTP :-) | |
255 */ | |
256 #ifndef OPENSSL_NO_SCTP | |
257 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
258 #endif | |
259 if (!ssl_init_wbio_buffer(s,1)) { ret= -
1; goto end; } | |
260 | |
261 ssl3_init_finished_mac(s); | |
262 s->state=SSL3_ST_SR_CLNT_HELLO_A; | |
263 s->ctx->stats.sess_accept++; | |
264 } | |
265 else | |
266 { | |
267 /* s->state == SSL_ST_RENEGOTIATE, | |
268 * we will just send a HelloRequest */ | |
269 s->ctx->stats.sess_accept_renegotiate++; | |
270 s->state=SSL3_ST_SW_HELLO_REQ_A; | |
271 } | |
272 | |
273 break; | |
274 | |
275 case SSL3_ST_SW_HELLO_REQ_A: | |
276 case SSL3_ST_SW_HELLO_REQ_B: | |
277 | |
278 s->shutdown=0; | |
279 dtls1_start_timer(s); | |
280 ret=dtls1_send_hello_request(s); | |
281 if (ret <= 0) goto end; | |
282 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C; | |
283 s->state=SSL3_ST_SW_FLUSH; | |
284 s->init_num=0; | |
285 | |
286 ssl3_init_finished_mac(s); | |
287 break; | |
288 | |
289 case SSL3_ST_SW_HELLO_REQ_C: | |
290 s->state=SSL_ST_OK; | |
291 break; | |
292 | |
293 case SSL3_ST_SR_CLNT_HELLO_A: | |
294 case SSL3_ST_SR_CLNT_HELLO_B: | |
295 case SSL3_ST_SR_CLNT_HELLO_C: | |
296 | |
297 s->shutdown=0; | |
298 ret=ssl3_get_client_hello(s); | |
299 if (ret <= 0) goto end; | |
300 dtls1_stop_timer(s); | |
301 | |
302 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCH
ANGE)) | |
303 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; | |
304 else | |
305 s->state = SSL3_ST_SW_SRVR_HELLO_A; | |
306 | |
307 s->init_num=0; | |
308 | |
309 /* Reflect ClientHello sequence to remain stateless whil
e listening */ | |
310 if (listen) | |
311 { | |
312 memcpy(s->s3->write_sequence, s->s3->read_sequen
ce, sizeof(s->s3->write_sequence)); | |
313 } | |
314 | |
315 /* If we're just listening, stop here */ | |
316 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) | |
317 { | |
318 ret = 2; | |
319 s->d1->listen = 0; | |
320 /* Set expected sequence numbers | |
321 * to continue the handshake. | |
322 */ | |
323 s->d1->handshake_read_seq = 2; | |
324 s->d1->handshake_write_seq = 1; | |
325 s->d1->next_handshake_write_seq = 1; | |
326 goto end; | |
327 } | |
328 | |
329 break; | |
330 | |
331 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: | |
332 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: | |
333 | |
334 ret = dtls1_send_hello_verify_request(s); | |
335 if ( ret <= 0) goto end; | |
336 s->state=SSL3_ST_SW_FLUSH; | |
337 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; | |
338 | |
339 /* HelloVerifyRequest resets Finished MAC */ | |
340 if (s->version != DTLS1_BAD_VER) | |
341 ssl3_init_finished_mac(s); | |
342 break; | |
343 | |
344 #ifndef OPENSSL_NO_SCTP | |
345 case DTLS1_SCTP_ST_SR_READ_SOCK: | |
346 | |
347 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
| |
348 { | |
349 s->s3->in_read_app_data=2; | |
350 s->rwstate=SSL_READING; | |
351 BIO_clear_retry_flags(SSL_get_rbio(s)); | |
352 BIO_set_retry_read(SSL_get_rbio(s)); | |
353 ret = -1; | |
354 goto end; | |
355 } | |
356 | |
357 s->state=SSL3_ST_SR_FINISHED_A; | |
358 break; | |
359 | |
360 case DTLS1_SCTP_ST_SW_WRITE_SOCK: | |
361 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); | |
362 if (ret < 0) goto end; | |
363 | |
364 if (ret == 0) | |
365 { | |
366 if (s->d1->next_state != SSL_ST_OK) | |
367 { | |
368 s->s3->in_read_app_data=2; | |
369 s->rwstate=SSL_READING; | |
370 BIO_clear_retry_flags(SSL_get_rbio(s)); | |
371 BIO_set_retry_read(SSL_get_rbio(s)); | |
372 ret = -1; | |
373 goto end; | |
374 } | |
375 } | |
376 | |
377 s->state=s->d1->next_state; | |
378 break; | |
379 #endif | |
380 | |
381 case SSL3_ST_SW_SRVR_HELLO_A: | |
382 case SSL3_ST_SW_SRVR_HELLO_B: | |
383 s->renegotiate = 2; | |
384 dtls1_start_timer(s); | |
385 ret=dtls1_send_server_hello(s); | |
386 if (ret <= 0) goto end; | |
387 | |
388 if (s->hit) | |
389 { | |
390 #ifndef OPENSSL_NO_SCTP | |
391 /* Add new shared key for SCTP-Auth, | |
392 * will be ignored if no SCTP used. | |
393 */ | |
394 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_
AUTH_LABEL), | |
395 DTLS1_SCTP_AUTH_LABEL); | |
396 | |
397 SSL_export_keying_material(s, sctpauthkey, | |
398 sizeof(sctpauthkey),
labelbuffer, | |
399 sizeof(labelbuffer),
NULL, 0, 0); | |
400 | |
401 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AD
D_AUTH_KEY, | |
402 sizeof(sctpauthkey), sctpauthkey); | |
403 #endif | |
404 #ifndef OPENSSL_NO_TLSEXT | |
405 if (s->tlsext_ticket_expected) | |
406 s->state=SSL3_ST_SW_SESSION_TICKET_A; | |
407 else | |
408 s->state=SSL3_ST_SW_CHANGE_A; | |
409 #else | |
410 s->state=SSL3_ST_SW_CHANGE_A; | |
411 #endif | |
412 } | |
413 else | |
414 s->state=SSL3_ST_SW_CERT_A; | |
415 s->init_num=0; | |
416 break; | |
417 | |
418 case SSL3_ST_SW_CERT_A: | |
419 case SSL3_ST_SW_CERT_B: | |
420 /* Check if it is anon DH or normal PSK */ | |
421 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) | |
422 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL
_kPSK)) | |
423 { | |
424 dtls1_start_timer(s); | |
425 ret=dtls1_send_server_certificate(s); | |
426 if (ret <= 0) goto end; | |
427 #ifndef OPENSSL_NO_TLSEXT | |
428 if (s->tlsext_status_expected) | |
429 s->state=SSL3_ST_SW_CERT_STATUS_A; | |
430 else | |
431 s->state=SSL3_ST_SW_KEY_EXCH_A; | |
432 } | |
433 else | |
434 { | |
435 skip = 1; | |
436 s->state=SSL3_ST_SW_KEY_EXCH_A; | |
437 } | |
438 #else | |
439 } | |
440 else | |
441 skip=1; | |
442 | |
443 s->state=SSL3_ST_SW_KEY_EXCH_A; | |
444 #endif | |
445 s->init_num=0; | |
446 break; | |
447 | |
448 case SSL3_ST_SW_KEY_EXCH_A: | |
449 case SSL3_ST_SW_KEY_EXCH_B: | |
450 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
451 | |
452 /* clear this, it may get reset by | |
453 * send_server_key_exchange */ | |
454 if ((s->options & SSL_OP_EPHEMERAL_RSA) | |
455 #ifndef OPENSSL_NO_KRB5 | |
456 && !(alg_k & SSL_kKRB5) | |
457 #endif /* OPENSSL_NO_KRB5 */ | |
458 ) | |
459 /* option SSL_OP_EPHEMERAL_RSA sends temporary R
SA key | |
460 * even when forbidden by protocol specs | |
461 * (handshake may fail as clients are not requir
ed to | |
462 * be able to handle this) */ | |
463 s->s3->tmp.use_rsa_tmp=1; | |
464 else | |
465 s->s3->tmp.use_rsa_tmp=0; | |
466 | |
467 /* only send if a DH key exchange or | |
468 * RSA but we have a sign only certificate */ | |
469 if (s->s3->tmp.use_rsa_tmp | |
470 /* PSK: send ServerKeyExchange if PSK identity | |
471 * hint if provided */ | |
472 #ifndef OPENSSL_NO_PSK | |
473 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) | |
474 #endif | |
475 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) | |
476 || (alg_k & SSL_kEECDH) | |
477 || ((alg_k & SSL_kRSA) | |
478 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey
== NULL | |
479 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) | |
480 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY
_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) | |
481 ) | |
482 ) | |
483 ) | |
484 ) | |
485 { | |
486 dtls1_start_timer(s); | |
487 ret=dtls1_send_server_key_exchange(s); | |
488 if (ret <= 0) goto end; | |
489 } | |
490 else | |
491 skip=1; | |
492 | |
493 s->state=SSL3_ST_SW_CERT_REQ_A; | |
494 s->init_num=0; | |
495 break; | |
496 | |
497 case SSL3_ST_SW_CERT_REQ_A: | |
498 case SSL3_ST_SW_CERT_REQ_B: | |
499 if (/* don't request cert unless asked for it: */ | |
500 !(s->verify_mode & SSL_VERIFY_PEER) || | |
501 /* if SSL_VERIFY_CLIENT_ONCE is set, | |
502 * don't request cert during re-negotiation: */ | |
503 ((s->session->peer != NULL) && | |
504 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || | |
505 /* never request cert in anonymous ciphersuites | |
506 * (see section "Certificate request" in SSL 3 d
rafts | |
507 * and in RFC 2246): */ | |
508 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aN
ULL) && | |
509 /* ... except when the application insists on v
erification | |
510 * (against the specs, but s3_clnt.c accepts th
is for SSL 3) */ | |
511 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_C
ERT)) || | |
512 /* never request cert in Kerberos ciphersuites
*/ | |
513 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKR
B5) | |
514 /* With normal PSK Certificates and | |
515 * Certificate Requests are omitted */ | |
516 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_
kPSK)) | |
517 { | |
518 /* no cert request */ | |
519 skip=1; | |
520 s->s3->tmp.cert_request=0; | |
521 s->state=SSL3_ST_SW_SRVR_DONE_A; | |
522 #ifndef OPENSSL_NO_SCTP | |
523 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
524 { | |
525 s->d1->next_state = SSL3_ST_SW_SRVR_DONE
_A; | |
526 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; | |
527 } | |
528 #endif | |
529 } | |
530 else | |
531 { | |
532 s->s3->tmp.cert_request=1; | |
533 dtls1_start_timer(s); | |
534 ret=dtls1_send_certificate_request(s); | |
535 if (ret <= 0) goto end; | |
536 #ifndef NETSCAPE_HANG_BUG | |
537 s->state=SSL3_ST_SW_SRVR_DONE_A; | |
538 #ifndef OPENSSL_NO_SCTP | |
539 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
540 { | |
541 s->d1->next_state = SSL3_ST_SW_SRVR_DONE
_A; | |
542 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; | |
543 } | |
544 #endif | |
545 #else | |
546 s->state=SSL3_ST_SW_FLUSH; | |
547 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; | |
548 #ifndef OPENSSL_NO_SCTP | |
549 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
550 { | |
551 s->d1->next_state = s->s3->tmp.next_stat
e; | |
552 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_W
RITE_SOCK; | |
553 } | |
554 #endif | |
555 #endif | |
556 s->init_num=0; | |
557 } | |
558 break; | |
559 | |
560 case SSL3_ST_SW_SRVR_DONE_A: | |
561 case SSL3_ST_SW_SRVR_DONE_B: | |
562 dtls1_start_timer(s); | |
563 ret=dtls1_send_server_done(s); | |
564 if (ret <= 0) goto end; | |
565 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; | |
566 s->state=SSL3_ST_SW_FLUSH; | |
567 s->init_num=0; | |
568 break; | |
569 | |
570 case SSL3_ST_SW_FLUSH: | |
571 s->rwstate=SSL_WRITING; | |
572 if (BIO_flush(s->wbio) <= 0) | |
573 { | |
574 /* If the write error was fatal, stop trying */ | |
575 if (!BIO_should_retry(s->wbio)) | |
576 { | |
577 s->rwstate=SSL_NOTHING; | |
578 s->state=s->s3->tmp.next_state; | |
579 } | |
580 | |
581 ret= -1; | |
582 goto end; | |
583 } | |
584 s->rwstate=SSL_NOTHING; | |
585 s->state=s->s3->tmp.next_state; | |
586 break; | |
587 | |
588 case SSL3_ST_SR_CERT_A: | |
589 case SSL3_ST_SR_CERT_B: | |
590 /* Check for second client hello (MS SGC) */ | |
591 ret = ssl3_check_client_hello(s); | |
592 if (ret <= 0) | |
593 goto end; | |
594 if (ret == 2) | |
595 { | |
596 dtls1_stop_timer(s); | |
597 s->state = SSL3_ST_SR_CLNT_HELLO_C; | |
598 } | |
599 else { | |
600 /* could be sent for a DH cert, even if we | |
601 * have not asked for it :-) */ | |
602 ret=ssl3_get_client_certificate(s); | |
603 if (ret <= 0) goto end; | |
604 s->init_num=0; | |
605 s->state=SSL3_ST_SR_KEY_EXCH_A; | |
606 } | |
607 break; | |
608 | |
609 case SSL3_ST_SR_KEY_EXCH_A: | |
610 case SSL3_ST_SR_KEY_EXCH_B: | |
611 ret=ssl3_get_client_key_exchange(s); | |
612 if (ret <= 0) goto end; | |
613 #ifndef OPENSSL_NO_SCTP | |
614 /* Add new shared key for SCTP-Auth, | |
615 * will be ignored if no SCTP used. | |
616 */ | |
617 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LA
BEL), | |
618 DTLS1_SCTP_AUTH_LABEL); | |
619 | |
620 SSL_export_keying_material(s, sctpauthkey, | |
621 sizeof(sctpauthkey), labelbuf
fer, | |
622 sizeof(labelbuffer), NULL, 0,
0); | |
623 | |
624 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_K
EY, | |
625 sizeof(sctpauthkey), sctpauthkey); | |
626 #endif | |
627 | |
628 s->state=SSL3_ST_SR_CERT_VRFY_A; | |
629 s->init_num=0; | |
630 | |
631 if (ret == 2) | |
632 { | |
633 /* For the ECDH ciphersuites when | |
634 * the client sends its ECDH pub key in | |
635 * a certificate, the CertificateVerify | |
636 * message is not sent. | |
637 */ | |
638 s->state=SSL3_ST_SR_FINISHED_A; | |
639 s->init_num = 0; | |
640 } | |
641 else | |
642 { | |
643 s->state=SSL3_ST_SR_CERT_VRFY_A; | |
644 s->init_num=0; | |
645 | |
646 /* We need to get hashes here so if there is | |
647 * a client cert, it can be verified */ | |
648 s->method->ssl3_enc->cert_verify_mac(s, | |
649 NID_md5, | |
650 &(s->s3->tmp.cert_verify_md[0])); | |
651 s->method->ssl3_enc->cert_verify_mac(s, | |
652 NID_sha1, | |
653 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_L
ENGTH])); | |
654 } | |
655 break; | |
656 | |
657 case SSL3_ST_SR_CERT_VRFY_A: | |
658 case SSL3_ST_SR_CERT_VRFY_B: | |
659 | |
660 s->d1->change_cipher_spec_ok = 1; | |
661 /* we should decide if we expected this one */ | |
662 ret=ssl3_get_cert_verify(s); | |
663 if (ret <= 0) goto end; | |
664 #ifndef OPENSSL_NO_SCTP | |
665 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && | |
666 state == SSL_ST_RENEGOTIATE) | |
667 s->state=DTLS1_SCTP_ST_SR_READ_SOCK; | |
668 else | |
669 #endif | |
670 s->state=SSL3_ST_SR_FINISHED_A; | |
671 s->init_num=0; | |
672 break; | |
673 | |
674 case SSL3_ST_SR_FINISHED_A: | |
675 case SSL3_ST_SR_FINISHED_B: | |
676 s->d1->change_cipher_spec_ok = 1; | |
677 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, | |
678 SSL3_ST_SR_FINISHED_B); | |
679 if (ret <= 0) goto end; | |
680 dtls1_stop_timer(s); | |
681 if (s->hit) | |
682 s->state=SSL_ST_OK; | |
683 #ifndef OPENSSL_NO_TLSEXT | |
684 else if (s->tlsext_ticket_expected) | |
685 s->state=SSL3_ST_SW_SESSION_TICKET_A; | |
686 #endif | |
687 else | |
688 s->state=SSL3_ST_SW_CHANGE_A; | |
689 s->init_num=0; | |
690 break; | |
691 | |
692 #ifndef OPENSSL_NO_TLSEXT | |
693 case SSL3_ST_SW_SESSION_TICKET_A: | |
694 case SSL3_ST_SW_SESSION_TICKET_B: | |
695 ret=dtls1_send_newsession_ticket(s); | |
696 if (ret <= 0) goto end; | |
697 s->state=SSL3_ST_SW_CHANGE_A; | |
698 s->init_num=0; | |
699 break; | |
700 | |
701 case SSL3_ST_SW_CERT_STATUS_A: | |
702 case SSL3_ST_SW_CERT_STATUS_B: | |
703 ret=ssl3_send_cert_status(s); | |
704 if (ret <= 0) goto end; | |
705 s->state=SSL3_ST_SW_KEY_EXCH_A; | |
706 s->init_num=0; | |
707 break; | |
708 | |
709 #endif | |
710 | |
711 case SSL3_ST_SW_CHANGE_A: | |
712 case SSL3_ST_SW_CHANGE_B: | |
713 | |
714 s->session->cipher=s->s3->tmp.new_cipher; | |
715 if (!s->method->ssl3_enc->setup_key_block(s)) | |
716 { ret= -1; goto end; } | |
717 | |
718 ret=dtls1_send_change_cipher_spec(s, | |
719 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); | |
720 | |
721 if (ret <= 0) goto end; | |
722 | |
723 #ifndef OPENSSL_NO_SCTP | |
724 /* Change to new shared key of SCTP-Auth, | |
725 * will be ignored if no SCTP used. | |
726 */ | |
727 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_
KEY, 0, NULL); | |
728 #endif | |
729 | |
730 s->state=SSL3_ST_SW_FINISHED_A; | |
731 s->init_num=0; | |
732 | |
733 if (!s->method->ssl3_enc->change_cipher_state(s, | |
734 SSL3_CHANGE_CIPHER_SERVER_WRITE)) | |
735 { | |
736 ret= -1; | |
737 goto end; | |
738 } | |
739 | |
740 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); | |
741 break; | |
742 | |
743 case SSL3_ST_SW_FINISHED_A: | |
744 case SSL3_ST_SW_FINISHED_B: | |
745 ret=dtls1_send_finished(s, | |
746 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, | |
747 s->method->ssl3_enc->server_finished_label, | |
748 s->method->ssl3_enc->server_finished_label_len); | |
749 if (ret <= 0) goto end; | |
750 s->state=SSL3_ST_SW_FLUSH; | |
751 if (s->hit) | |
752 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; | |
753 else | |
754 { | |
755 s->s3->tmp.next_state=SSL_ST_OK; | |
756 #ifndef OPENSSL_NO_SCTP | |
757 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
758 { | |
759 s->d1->next_state = s->s3->tmp.next_stat
e; | |
760 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_W
RITE_SOCK; | |
761 } | |
762 #endif | |
763 } | |
764 s->init_num=0; | |
765 break; | |
766 | |
767 case SSL_ST_OK: | |
768 /* clean a few things up */ | |
769 ssl3_cleanup_key_block(s); | |
770 | |
771 #if 0 | |
772 BUF_MEM_free(s->init_buf); | |
773 s->init_buf=NULL; | |
774 #endif | |
775 | |
776 /* remove buffering on output */ | |
777 ssl_free_wbio_buffer(s); | |
778 | |
779 s->init_num=0; | |
780 | |
781 if (s->renegotiate == 2) /* skipped if we just sent a He
lloRequest */ | |
782 { | |
783 s->renegotiate=0; | |
784 s->new_session=0; | |
785 | |
786 ssl_update_cache(s,SSL_SESS_CACHE_SERVER); | |
787 | |
788 s->ctx->stats.sess_accept_good++; | |
789 /* s->server=1; */ | |
790 s->handshake_func=dtls1_accept; | |
791 | |
792 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); | |
793 } | |
794 | |
795 ret = 1; | |
796 | |
797 /* done handshaking, next message is client hello */ | |
798 s->d1->handshake_read_seq = 0; | |
799 /* next message is server hello */ | |
800 s->d1->handshake_write_seq = 0; | |
801 s->d1->next_handshake_write_seq = 0; | |
802 goto end; | |
803 /* break; */ | |
804 | |
805 default: | |
806 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); | |
807 ret= -1; | |
808 goto end; | |
809 /* break; */ | |
810 } | |
811 | |
812 if (!s->s3->tmp.reuse_message && !skip) | |
813 { | |
814 if (s->debug) | |
815 { | |
816 if ((ret=BIO_flush(s->wbio)) <= 0) | |
817 goto end; | |
818 } | |
819 | |
820 | |
821 if ((cb != NULL) && (s->state != state)) | |
822 { | |
823 new_state=s->state; | |
824 s->state=state; | |
825 cb(s,SSL_CB_ACCEPT_LOOP,1); | |
826 s->state=new_state; | |
827 } | |
828 } | |
829 skip=0; | |
830 } | |
831 end: | |
832 /* BIO_flush(s->wbio); */ | |
833 | |
834 s->in_handshake--; | |
835 #ifndef OPENSSL_NO_SCTP | |
836 /* Notify SCTP BIO socket to leave handshake | |
837 * mode and prevent stream identifier other | |
838 * than 0. Will be ignored if no SCTP is used. | |
839 */ | |
840 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
s->in_handshake, NULL); | |
841 #endif | |
842 | |
843 if (cb != NULL) | |
844 cb(s,SSL_CB_ACCEPT_EXIT,ret); | |
845 return(ret); | |
846 } | |
847 | |
848 int dtls1_send_hello_request(SSL *s) | |
849 { | |
850 unsigned char *p; | |
851 | |
852 if (s->state == SSL3_ST_SW_HELLO_REQ_A) | |
853 { | |
854 p=(unsigned char *)s->init_buf->data; | |
855 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0,
0); | |
856 | |
857 s->state=SSL3_ST_SW_HELLO_REQ_B; | |
858 /* number of bytes to write */ | |
859 s->init_num=DTLS1_HM_HEADER_LENGTH; | |
860 s->init_off=0; | |
861 | |
862 /* no need to buffer this message, since there are no retransmit
| |
863 * requests for it */ | |
864 } | |
865 | |
866 /* SSL3_ST_SW_HELLO_REQ_B */ | |
867 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
868 } | |
869 | |
870 int dtls1_send_hello_verify_request(SSL *s) | |
871 { | |
872 unsigned int msg_len; | |
873 unsigned char *msg, *buf, *p; | |
874 | |
875 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) | |
876 { | |
877 buf = (unsigned char *)s->init_buf->data; | |
878 | |
879 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); | |
880 *(p++) = s->version >> 8; | |
881 *(p++) = s->version & 0xFF; | |
882 | |
883 if (s->ctx->app_gen_cookie_cb == NULL || | |
884 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, | |
885 &(s->d1->cookie_len)) == 0) | |
886 { | |
887 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTER
NAL_ERROR); | |
888 return 0; | |
889 } | |
890 | |
891 *(p++) = (unsigned char) s->d1->cookie_len; | |
892 memcpy(p, s->d1->cookie, s->d1->cookie_len); | |
893 p += s->d1->cookie_len; | |
894 msg_len = p - msg; | |
895 | |
896 dtls1_set_message_header(s, buf, | |
897 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); | |
898 | |
899 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; | |
900 /* number of bytes to write */ | |
901 s->init_num=p-buf; | |
902 s->init_off=0; | |
903 } | |
904 | |
905 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ | |
906 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
907 } | |
908 | |
909 int dtls1_send_server_hello(SSL *s) | |
910 { | |
911 unsigned char *buf; | |
912 unsigned char *p,*d; | |
913 int i; | |
914 unsigned int sl; | |
915 unsigned long l,Time; | |
916 | |
917 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) | |
918 { | |
919 buf=(unsigned char *)s->init_buf->data; | |
920 p=s->s3->server_random; | |
921 Time=(unsigned long)time(NULL); /* Time */ | |
922 l2n(Time,p); | |
923 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4); | |
924 /* Do the message type and length last */ | |
925 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); | |
926 | |
927 *(p++)=s->version>>8; | |
928 *(p++)=s->version&0xff; | |
929 | |
930 /* Random stuff */ | |
931 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); | |
932 p+=SSL3_RANDOM_SIZE; | |
933 | |
934 /* now in theory we have 3 options to sending back the | |
935 * session id. If it is a re-use, we send back the | |
936 * old session-id, if it is a new session, we send | |
937 * back the new session-id or we send back a 0 length | |
938 * session-id if we want it to be single use. | |
939 * Currently I will not implement the '0' length session-id | |
940 * 12-Jan-98 - I'll now support the '0' length stuff. | |
941 */ | |
942 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) | |
943 s->session->session_id_length=0; | |
944 | |
945 sl=s->session->session_id_length; | |
946 if (sl > sizeof s->session->session_id) | |
947 { | |
948 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERR
OR); | |
949 return -1; | |
950 } | |
951 *(p++)=sl; | |
952 memcpy(p,s->session->session_id,sl); | |
953 p+=sl; | |
954 | |
955 /* put the cipher */ | |
956 if (s->s3->tmp.new_cipher == NULL) | |
957 return -1; | |
958 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); | |
959 p+=i; | |
960 | |
961 /* put the compression method */ | |
962 #ifdef OPENSSL_NO_COMP | |
963 *(p++)=0; | |
964 #else | |
965 if (s->s3->tmp.new_compression == NULL) | |
966 *(p++)=0; | |
967 else | |
968 *(p++)=s->s3->tmp.new_compression->id; | |
969 #endif | |
970 | |
971 #ifndef OPENSSL_NO_TLSEXT | |
972 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_
LENGTH)) == NULL) | |
973 { | |
974 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERRO
R); | |
975 return -1; | |
976 } | |
977 #endif | |
978 | |
979 /* do the header */ | |
980 l=(p-d); | |
981 d=buf; | |
982 | |
983 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l
); | |
984 | |
985 s->state=SSL3_ST_SW_SRVR_HELLO_B; | |
986 /* number of bytes to write */ | |
987 s->init_num=p-buf; | |
988 s->init_off=0; | |
989 | |
990 /* buffer the message to handle re-xmits */ | |
991 dtls1_buffer_message(s, 0); | |
992 } | |
993 | |
994 /* SSL3_ST_SW_SRVR_HELLO_B */ | |
995 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
996 } | |
997 | |
998 int dtls1_send_server_done(SSL *s) | |
999 { | |
1000 unsigned char *p; | |
1001 | |
1002 if (s->state == SSL3_ST_SW_SRVR_DONE_A) | |
1003 { | |
1004 p=(unsigned char *)s->init_buf->data; | |
1005 | |
1006 /* do the header */ | |
1007 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0)
; | |
1008 | |
1009 s->state=SSL3_ST_SW_SRVR_DONE_B; | |
1010 /* number of bytes to write */ | |
1011 s->init_num=DTLS1_HM_HEADER_LENGTH; | |
1012 s->init_off=0; | |
1013 | |
1014 /* buffer the message to handle re-xmits */ | |
1015 dtls1_buffer_message(s, 0); | |
1016 } | |
1017 | |
1018 /* SSL3_ST_SW_SRVR_DONE_B */ | |
1019 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
1020 } | |
1021 | |
1022 int dtls1_send_server_key_exchange(SSL *s) | |
1023 { | |
1024 #ifndef OPENSSL_NO_RSA | |
1025 unsigned char *q; | |
1026 int j,num; | |
1027 RSA *rsa; | |
1028 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; | |
1029 unsigned int u; | |
1030 #endif | |
1031 #ifndef OPENSSL_NO_DH | |
1032 DH *dh=NULL,*dhp; | |
1033 #endif | |
1034 #ifndef OPENSSL_NO_ECDH | |
1035 EC_KEY *ecdh=NULL, *ecdhp; | |
1036 unsigned char *encodedPoint = NULL; | |
1037 int encodedlen = 0; | |
1038 int curve_id = 0; | |
1039 BN_CTX *bn_ctx = NULL; | |
1040 #endif | |
1041 EVP_PKEY *pkey; | |
1042 unsigned char *p,*d; | |
1043 int al,i; | |
1044 unsigned long type; | |
1045 int n; | |
1046 CERT *cert; | |
1047 BIGNUM *r[4]; | |
1048 int nr[4],kn; | |
1049 BUF_MEM *buf; | |
1050 EVP_MD_CTX md_ctx; | |
1051 | |
1052 EVP_MD_CTX_init(&md_ctx); | |
1053 if (s->state == SSL3_ST_SW_KEY_EXCH_A) | |
1054 { | |
1055 type=s->s3->tmp.new_cipher->algorithm_mkey; | |
1056 cert=s->cert; | |
1057 | |
1058 buf=s->init_buf; | |
1059 | |
1060 r[0]=r[1]=r[2]=r[3]=NULL; | |
1061 n=0; | |
1062 #ifndef OPENSSL_NO_RSA | |
1063 if (type & SSL_kRSA) | |
1064 { | |
1065 rsa=cert->rsa_tmp; | |
1066 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) | |
1067 { | |
1068 rsa=s->cert->rsa_tmp_cb(s, | |
1069 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), | |
1070 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cip
her)); | |
1071 if(rsa == NULL) | |
1072 { | |
1073 al=SSL_AD_HANDSHAKE_FAILURE; | |
1074 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHA
NGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); | |
1075 goto f_err; | |
1076 } | |
1077 RSA_up_ref(rsa); | |
1078 cert->rsa_tmp=rsa; | |
1079 } | |
1080 if (rsa == NULL) | |
1081 { | |
1082 al=SSL_AD_HANDSHAKE_FAILURE; | |
1083 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_
R_MISSING_TMP_RSA_KEY); | |
1084 goto f_err; | |
1085 } | |
1086 r[0]=rsa->n; | |
1087 r[1]=rsa->e; | |
1088 s->s3->tmp.use_rsa_tmp=1; | |
1089 } | |
1090 else | |
1091 #endif | |
1092 #ifndef OPENSSL_NO_DH | |
1093 if (type & SSL_kEDH) | |
1094 { | |
1095 dhp=cert->dh_tmp; | |
1096 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) | |
1097 dhp=s->cert->dh_tmp_cb(s, | |
1098 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), | |
1099 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cip
her)); | |
1100 if (dhp == NULL) | |
1101 { | |
1102 al=SSL_AD_HANDSHAKE_FAILURE; | |
1103 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_
R_MISSING_TMP_DH_KEY); | |
1104 goto f_err; | |
1105 } | |
1106 | |
1107 if (s->s3->tmp.dh != NULL) | |
1108 { | |
1109 DH_free(dh); | |
1110 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR
_R_INTERNAL_ERROR); | |
1111 goto err; | |
1112 } | |
1113 | |
1114 if ((dh=DHparams_dup(dhp)) == NULL) | |
1115 { | |
1116 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_
R_DH_LIB); | |
1117 goto err; | |
1118 } | |
1119 | |
1120 s->s3->tmp.dh=dh; | |
1121 if ((dhp->pub_key == NULL || | |
1122 dhp->priv_key == NULL || | |
1123 (s->options & SSL_OP_SINGLE_DH_USE))) | |
1124 { | |
1125 if(!DH_generate_key(dh)) | |
1126 { | |
1127 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, | |
1128 ERR_R_DH_LIB); | |
1129 goto err; | |
1130 } | |
1131 } | |
1132 else | |
1133 { | |
1134 dh->pub_key=BN_dup(dhp->pub_key); | |
1135 dh->priv_key=BN_dup(dhp->priv_key); | |
1136 if ((dh->pub_key == NULL) || | |
1137 (dh->priv_key == NULL)) | |
1138 { | |
1139 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHA
NGE,ERR_R_DH_LIB); | |
1140 goto err; | |
1141 } | |
1142 } | |
1143 r[0]=dh->p; | |
1144 r[1]=dh->g; | |
1145 r[2]=dh->pub_key; | |
1146 } | |
1147 else | |
1148 #endif | |
1149 #ifndef OPENSSL_NO_ECDH | |
1150 if (type & SSL_kEECDH) | |
1151 { | |
1152 const EC_GROUP *group; | |
1153 | |
1154 ecdhp=cert->ecdh_tmp; | |
1155 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) | |
1156 { | |
1157 ecdhp=s->cert->ecdh_tmp_cb(s, | |
1158 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), | |
1159 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cip
her)); | |
1160 } | |
1161 if (ecdhp == NULL) | |
1162 { | |
1163 al=SSL_AD_HANDSHAKE_FAILURE; | |
1164 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_
R_MISSING_TMP_ECDH_KEY); | |
1165 goto f_err; | |
1166 } | |
1167 | |
1168 if (s->s3->tmp.ecdh != NULL) | |
1169 { | |
1170 EC_KEY_free(s->s3->tmp.ecdh); | |
1171 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR
_R_INTERNAL_ERROR); | |
1172 goto err; | |
1173 } | |
1174 | |
1175 /* Duplicate the ECDH structure. */ | |
1176 if (ecdhp == NULL) | |
1177 { | |
1178 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_
R_ECDH_LIB); | |
1179 goto err; | |
1180 } | |
1181 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) | |
1182 { | |
1183 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_
R_ECDH_LIB); | |
1184 goto err; | |
1185 } | |
1186 | |
1187 s->s3->tmp.ecdh=ecdh; | |
1188 if ((EC_KEY_get0_public_key(ecdh) == NULL) || | |
1189 (EC_KEY_get0_private_key(ecdh) == NULL) || | |
1190 (s->options & SSL_OP_SINGLE_ECDH_USE)) | |
1191 { | |
1192 if(!EC_KEY_generate_key(ecdh)) | |
1193 { | |
1194 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
ERR_R_ECDH_LIB); | |
1195 goto err; | |
1196 } | |
1197 } | |
1198 | |
1199 if (((group = EC_KEY_get0_group(ecdh)) == NULL) || | |
1200 (EC_KEY_get0_public_key(ecdh) == NULL) || | |
1201 (EC_KEY_get0_private_key(ecdh) == NULL)) | |
1202 { | |
1203 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_
R_ECDH_LIB); | |
1204 goto err; | |
1205 } | |
1206 | |
1207 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && | |
1208 (EC_GROUP_get_degree(group) > 163)) | |
1209 { | |
1210 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_
R_ECGROUP_TOO_LARGE_FOR_CIPHER); | |
1211 goto err; | |
1212 } | |
1213 | |
1214 /* XXX: For now, we only support ephemeral ECDH | |
1215 * keys over named (not generic) curves. For | |
1216 * supported named curves, curve_id is non-zero. | |
1217 */ | |
1218 if ((curve_id = | |
1219 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))
) | |
1220 == 0) | |
1221 { | |
1222 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_
R_UNSUPPORTED_ELLIPTIC_CURVE); | |
1223 goto err; | |
1224 } | |
1225 | |
1226 /* Encode the public key. | |
1227 * First check the size of encoding and | |
1228 * allocate memory accordingly. | |
1229 */ | |
1230 encodedlen = EC_POINT_point2oct(group, | |
1231 EC_KEY_get0_public_key(ecdh), | |
1232 POINT_CONVERSION_UNCOMPRESSED, | |
1233 NULL, 0, NULL); | |
1234 | |
1235 encodedPoint = (unsigned char *) | |
1236 OPENSSL_malloc(encodedlen*sizeof(unsigned char)); | |
1237 bn_ctx = BN_CTX_new(); | |
1238 if ((encodedPoint == NULL) || (bn_ctx == NULL)) | |
1239 { | |
1240 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_
R_MALLOC_FAILURE); | |
1241 goto err; | |
1242 } | |
1243 | |
1244 | |
1245 encodedlen = EC_POINT_point2oct(group, | |
1246 EC_KEY_get0_public_key(ecdh), | |
1247 POINT_CONVERSION_UNCOMPRESSED, | |
1248 encodedPoint, encodedlen, bn_ctx); | |
1249 | |
1250 if (encodedlen == 0) | |
1251 { | |
1252 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_
R_ECDH_LIB); | |
1253 goto err; | |
1254 } | |
1255 | |
1256 BN_CTX_free(bn_ctx); bn_ctx=NULL; | |
1257 | |
1258 /* XXX: For now, we only support named (not | |
1259 * generic) curves in ECDH ephemeral key exchanges. | |
1260 * In this situation, we need four additional bytes | |
1261 * to encode the entire ServerECDHParams | |
1262 * structure. | |
1263 */ | |
1264 n = 4 + encodedlen; | |
1265 | |
1266 /* We'll generate the serverKeyExchange message | |
1267 * explicitly so we can set these to NULLs | |
1268 */ | |
1269 r[0]=NULL; | |
1270 r[1]=NULL; | |
1271 r[2]=NULL; | |
1272 r[3]=NULL; | |
1273 } | |
1274 else | |
1275 #endif /* !OPENSSL_NO_ECDH */ | |
1276 #ifndef OPENSSL_NO_PSK | |
1277 if (type & SSL_kPSK) | |
1278 { | |
1279 /* reserve size for record length and PSK identi
ty hint*/ | |
1280 n+=2+strlen(s->ctx->psk_identity_hint); | |
1281 } | |
1282 else | |
1283 #endif /* !OPENSSL_NO_PSK */ | |
1284 { | |
1285 al=SSL_AD_HANDSHAKE_FAILURE; | |
1286 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOW
N_KEY_EXCHANGE_TYPE); | |
1287 goto f_err; | |
1288 } | |
1289 for (i=0; r[i] != NULL; i++) | |
1290 { | |
1291 nr[i]=BN_num_bytes(r[i]); | |
1292 n+=2+nr[i]; | |
1293 } | |
1294 | |
1295 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) | |
1296 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) | |
1297 { | |
1298 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NUL
L)) | |
1299 == NULL) | |
1300 { | |
1301 al=SSL_AD_DECODE_ERROR; | |
1302 goto f_err; | |
1303 } | |
1304 kn=EVP_PKEY_size(pkey); | |
1305 } | |
1306 else | |
1307 { | |
1308 pkey=NULL; | |
1309 kn=0; | |
1310 } | |
1311 | |
1312 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) | |
1313 { | |
1314 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF)
; | |
1315 goto err; | |
1316 } | |
1317 d=(unsigned char *)s->init_buf->data; | |
1318 p= &(d[DTLS1_HM_HEADER_LENGTH]); | |
1319 | |
1320 for (i=0; r[i] != NULL; i++) | |
1321 { | |
1322 s2n(nr[i],p); | |
1323 BN_bn2bin(r[i],p); | |
1324 p+=nr[i]; | |
1325 } | |
1326 | |
1327 #ifndef OPENSSL_NO_ECDH | |
1328 if (type & SSL_kEECDH) | |
1329 { | |
1330 /* XXX: For now, we only support named (not generic) cur
ves. | |
1331 * In this situation, the serverKeyExchange message has: | |
1332 * [1 byte CurveType], [2 byte CurveName] | |
1333 * [1 byte length of encoded point], followed by | |
1334 * the actual encoded point itself | |
1335 */ | |
1336 *p = NAMED_CURVE_TYPE; | |
1337 p += 1; | |
1338 *p = 0; | |
1339 p += 1; | |
1340 *p = curve_id; | |
1341 p += 1; | |
1342 *p = encodedlen; | |
1343 p += 1; | |
1344 memcpy((unsigned char*)p, | |
1345 (unsigned char *)encodedPoint, | |
1346 encodedlen); | |
1347 OPENSSL_free(encodedPoint); | |
1348 encodedPoint = NULL; | |
1349 p += encodedlen; | |
1350 } | |
1351 #endif | |
1352 | |
1353 #ifndef OPENSSL_NO_PSK | |
1354 if (type & SSL_kPSK) | |
1355 { | |
1356 /* copy PSK identity hint */ | |
1357 s2n(strlen(s->ctx->psk_identity_hint), p); | |
1358 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->
ctx->psk_identity_hint)); | |
1359 p+=strlen(s->ctx->psk_identity_hint); | |
1360 } | |
1361 #endif | |
1362 | |
1363 /* not anonymous */ | |
1364 if (pkey != NULL) | |
1365 { | |
1366 /* n is the length of the params, they start at | |
1367 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the spac
e | |
1368 * at the end. */ | |
1369 #ifndef OPENSSL_NO_RSA | |
1370 if (pkey->type == EVP_PKEY_RSA) | |
1371 { | |
1372 q=md_buf; | |
1373 j=0; | |
1374 for (num=2; num > 0; num--) | |
1375 { | |
1376 EVP_DigestInit_ex(&md_ctx,(num == 2) | |
1377 ?s->ctx->md5:s->ctx->sha1, NULL)
; | |
1378 EVP_DigestUpdate(&md_ctx,&(s->s3->client
_random[0]),SSL3_RANDOM_SIZE); | |
1379 EVP_DigestUpdate(&md_ctx,&(s->s3->server
_random[0]),SSL3_RANDOM_SIZE); | |
1380 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HE
ADER_LENGTH]),n); | |
1381 EVP_DigestFinal_ex(&md_ctx,q, | |
1382 (unsigned int *)&i); | |
1383 q+=i; | |
1384 j+=i; | |
1385 } | |
1386 if (RSA_sign(NID_md5_sha1, md_buf, j, | |
1387 &(p[2]), &u, pkey->pkey.rsa) <= 0) | |
1388 { | |
1389 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHA
NGE,ERR_LIB_RSA); | |
1390 goto err; | |
1391 } | |
1392 s2n(u,p); | |
1393 n+=u+2; | |
1394 } | |
1395 else | |
1396 #endif | |
1397 #if !defined(OPENSSL_NO_DSA) | |
1398 if (pkey->type == EVP_PKEY_DSA) | |
1399 { | |
1400 /* lets do DSS */ | |
1401 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); | |
1402 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]
),SSL3_RANDOM_SIZE); | |
1403 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]
),SSL3_RANDOM_SIZE); | |
1404 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGT
H]),n); | |
1405 if (!EVP_SignFinal(&md_ctx,&(p[2]), | |
1406 (unsigned int *)&i,pkey)) | |
1407 { | |
1408 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHA
NGE,ERR_LIB_DSA); | |
1409 goto err; | |
1410 } | |
1411 s2n(i,p); | |
1412 n+=i+2; | |
1413 } | |
1414 else | |
1415 #endif | |
1416 #if !defined(OPENSSL_NO_ECDSA) | |
1417 if (pkey->type == EVP_PKEY_EC) | |
1418 { | |
1419 /* let's do ECDSA */ | |
1420 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL); | |
1421 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]
),SSL3_RANDOM_SIZE); | |
1422 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]
),SSL3_RANDOM_SIZE); | |
1423 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGT
H]),n); | |
1424 if (!EVP_SignFinal(&md_ctx,&(p[2]), | |
1425 (unsigned int *)&i,pkey)) | |
1426 { | |
1427 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHA
NGE,ERR_LIB_ECDSA); | |
1428 goto err; | |
1429 } | |
1430 s2n(i,p); | |
1431 n+=i+2; | |
1432 } | |
1433 else | |
1434 #endif | |
1435 { | |
1436 /* Is this error check actually needed? */ | |
1437 al=SSL_AD_HANDSHAKE_FAILURE; | |
1438 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_
R_UNKNOWN_PKEY_TYPE); | |
1439 goto f_err; | |
1440 } | |
1441 } | |
1442 | |
1443 d = dtls1_set_message_header(s, d, | |
1444 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); | |
1445 | |
1446 /* we should now have things packed up, so lets send | |
1447 * it off */ | |
1448 s->init_num=n+DTLS1_HM_HEADER_LENGTH; | |
1449 s->init_off=0; | |
1450 | |
1451 /* buffer the message to handle re-xmits */ | |
1452 dtls1_buffer_message(s, 0); | |
1453 } | |
1454 | |
1455 s->state = SSL3_ST_SW_KEY_EXCH_B; | |
1456 EVP_MD_CTX_cleanup(&md_ctx); | |
1457 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
1458 f_err: | |
1459 ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
1460 err: | |
1461 #ifndef OPENSSL_NO_ECDH | |
1462 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); | |
1463 BN_CTX_free(bn_ctx); | |
1464 #endif | |
1465 EVP_MD_CTX_cleanup(&md_ctx); | |
1466 return(-1); | |
1467 } | |
1468 | |
1469 int dtls1_send_certificate_request(SSL *s) | |
1470 { | |
1471 unsigned char *p,*d; | |
1472 int i,j,nl,off,n; | |
1473 STACK_OF(X509_NAME) *sk=NULL; | |
1474 X509_NAME *name; | |
1475 BUF_MEM *buf; | |
1476 unsigned int msg_len; | |
1477 | |
1478 if (s->state == SSL3_ST_SW_CERT_REQ_A) | |
1479 { | |
1480 buf=s->init_buf; | |
1481 | |
1482 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); | |
1483 | |
1484 /* get the list of acceptable cert types */ | |
1485 p++; | |
1486 n=ssl3_get_req_cert_type(s,p); | |
1487 d[0]=n; | |
1488 p+=n; | |
1489 n++; | |
1490 | |
1491 off=n; | |
1492 p+=2; | |
1493 n+=2; | |
1494 | |
1495 sk=SSL_get_client_CA_list(s); | |
1496 nl=0; | |
1497 if (sk != NULL) | |
1498 { | |
1499 for (i=0; i<sk_X509_NAME_num(sk); i++) | |
1500 { | |
1501 name=sk_X509_NAME_value(sk,i); | |
1502 j=i2d_X509_NAME(name,NULL); | |
1503 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENG
TH+n+j+2)) | |
1504 { | |
1505 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQU
EST,ERR_R_BUF_LIB); | |
1506 goto err; | |
1507 } | |
1508 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_L
ENGTH+n]); | |
1509 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) | |
1510 { | |
1511 s2n(j,p); | |
1512 i2d_X509_NAME(name,&p); | |
1513 n+=2+j; | |
1514 nl+=2+j; | |
1515 } | |
1516 else | |
1517 { | |
1518 d=p; | |
1519 i2d_X509_NAME(name,&p); | |
1520 j-=2; s2n(j,d); j+=2; | |
1521 n+=j; | |
1522 nl+=j; | |
1523 } | |
1524 } | |
1525 } | |
1526 /* else no CA names */ | |
1527 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); | |
1528 s2n(nl,p); | |
1529 | |
1530 d=(unsigned char *)buf->data; | |
1531 *(d++)=SSL3_MT_CERTIFICATE_REQUEST; | |
1532 l2n3(n,d); | |
1533 s2n(s->d1->handshake_write_seq,d); | |
1534 s->d1->handshake_write_seq++; | |
1535 | |
1536 /* we should now have things packed up, so lets send | |
1537 * it off */ | |
1538 | |
1539 s->init_num=n+DTLS1_HM_HEADER_LENGTH; | |
1540 s->init_off=0; | |
1541 #ifdef NETSCAPE_HANG_BUG | |
1542 /* XXX: what to do about this? */ | |
1543 p=(unsigned char *)s->init_buf->data + s->init_num; | |
1544 | |
1545 /* do the header */ | |
1546 *(p++)=SSL3_MT_SERVER_DONE; | |
1547 *(p++)=0; | |
1548 *(p++)=0; | |
1549 *(p++)=0; | |
1550 s->init_num += 4; | |
1551 #endif | |
1552 | |
1553 /* XDTLS: set message header ? */ | |
1554 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; | |
1555 dtls1_set_message_header(s, (void *)s->init_buf->data, | |
1556 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len); | |
1557 | |
1558 /* buffer the message to handle re-xmits */ | |
1559 dtls1_buffer_message(s, 0); | |
1560 | |
1561 s->state = SSL3_ST_SW_CERT_REQ_B; | |
1562 } | |
1563 | |
1564 /* SSL3_ST_SW_CERT_REQ_B */ | |
1565 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
1566 err: | |
1567 return(-1); | |
1568 } | |
1569 | |
1570 int dtls1_send_server_certificate(SSL *s) | |
1571 { | |
1572 unsigned long l; | |
1573 X509 *x; | |
1574 | |
1575 if (s->state == SSL3_ST_SW_CERT_A) | |
1576 { | |
1577 x=ssl_get_server_send_cert(s); | |
1578 if (x == NULL) | |
1579 { | |
1580 /* VRS: allow null cert if auth == KRB5 */ | |
1581 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5)
|| | |
1582 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)
) | |
1583 { | |
1584 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R
_INTERNAL_ERROR); | |
1585 return(0); | |
1586 } | |
1587 } | |
1588 | |
1589 l=dtls1_output_cert_chain(s,x); | |
1590 s->state=SSL3_ST_SW_CERT_B; | |
1591 s->init_num=(int)l; | |
1592 s->init_off=0; | |
1593 | |
1594 /* buffer the message to handle re-xmits */ | |
1595 dtls1_buffer_message(s, 0); | |
1596 } | |
1597 | |
1598 /* SSL3_ST_SW_CERT_B */ | |
1599 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
1600 } | |
1601 | |
1602 #ifndef OPENSSL_NO_TLSEXT | |
1603 int dtls1_send_newsession_ticket(SSL *s) | |
1604 { | |
1605 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) | |
1606 { | |
1607 unsigned char *p, *senc, *macstart; | |
1608 int len, slen; | |
1609 unsigned int hlen, msg_len; | |
1610 EVP_CIPHER_CTX ctx; | |
1611 HMAC_CTX hctx; | |
1612 SSL_CTX *tctx = s->initial_ctx; | |
1613 unsigned char iv[EVP_MAX_IV_LENGTH]; | |
1614 unsigned char key_name[16]; | |
1615 | |
1616 /* get session encoding length */ | |
1617 slen = i2d_SSL_SESSION(s->session, NULL); | |
1618 /* Some length values are 16 bits, so forget it if session is | |
1619 * too long | |
1620 */ | |
1621 if (slen > 0xFF00) | |
1622 return -1; | |
1623 /* Grow buffer if need be: the length calculation is as | |
1624 * follows 12 (DTLS handshake message header) + | |
1625 * 4 (ticket lifetime hint) + 2 (ticket length) + | |
1626 * 16 (key name) + max_iv_len (iv length) + | |
1627 * session_length + max_enc_block_size (max encrypted session | |
1628 * length) + max_md_size (HMAC). | |
1629 */ | |
1630 if (!BUF_MEM_grow(s->init_buf, | |
1631 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + | |
1632 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) | |
1633 return -1; | |
1634 senc = OPENSSL_malloc(slen); | |
1635 if (!senc) | |
1636 return -1; | |
1637 p = senc; | |
1638 i2d_SSL_SESSION(s->session, &p); | |
1639 | |
1640 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); | |
1641 EVP_CIPHER_CTX_init(&ctx); | |
1642 HMAC_CTX_init(&hctx); | |
1643 /* Initialize HMAC and cipher contexts. If callback present | |
1644 * it does all the work otherwise use generated values | |
1645 * from parent ctx. | |
1646 */ | |
1647 if (tctx->tlsext_ticket_key_cb) | |
1648 { | |
1649 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, | |
1650 &hctx, 1) < 0) | |
1651 { | |
1652 OPENSSL_free(senc); | |
1653 return -1; | |
1654 } | |
1655 } | |
1656 else | |
1657 { | |
1658 RAND_pseudo_bytes(iv, 16); | |
1659 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, | |
1660 tctx->tlsext_tick_aes_key, iv); | |
1661 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, | |
1662 tlsext_tick_md(), NULL); | |
1663 memcpy(key_name, tctx->tlsext_tick_key_name, 16); | |
1664 } | |
1665 l2n(s->session->tlsext_tick_lifetime_hint, p); | |
1666 /* Skip ticket length for now */ | |
1667 p += 2; | |
1668 /* Output key name */ | |
1669 macstart = p; | |
1670 memcpy(p, key_name, 16); | |
1671 p += 16; | |
1672 /* output IV */ | |
1673 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); | |
1674 p += EVP_CIPHER_CTX_iv_length(&ctx); | |
1675 /* Encrypt session data */ | |
1676 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); | |
1677 p += len; | |
1678 EVP_EncryptFinal(&ctx, p, &len); | |
1679 p += len; | |
1680 EVP_CIPHER_CTX_cleanup(&ctx); | |
1681 | |
1682 HMAC_Update(&hctx, macstart, p - macstart); | |
1683 HMAC_Final(&hctx, p, &hlen); | |
1684 HMAC_CTX_cleanup(&hctx); | |
1685 | |
1686 p += hlen; | |
1687 /* Now write out lengths: p points to end of data written */ | |
1688 /* Total length */ | |
1689 len = p - (unsigned char *)(s->init_buf->data); | |
1690 /* Ticket length */ | |
1691 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH])
+ 4; | |
1692 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); | |
1693 | |
1694 /* number of bytes to write */ | |
1695 s->init_num= len; | |
1696 s->state=SSL3_ST_SW_SESSION_TICKET_B; | |
1697 s->init_off=0; | |
1698 OPENSSL_free(senc); | |
1699 | |
1700 /* XDTLS: set message header ? */ | |
1701 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; | |
1702 dtls1_set_message_header(s, (void *)s->init_buf->data, | |
1703 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len); | |
1704 | |
1705 /* buffer the message to handle re-xmits */ | |
1706 dtls1_buffer_message(s, 0); | |
1707 } | |
1708 | |
1709 /* SSL3_ST_SW_SESSION_TICKET_B */ | |
1710 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
1711 } | |
1712 #endif | |
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