3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
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.
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).
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.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
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)"
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
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.]
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>
129 static const SSL_METHOD *dtls1_get_server_method(int ver);
130 static int dtls1_send_hello_verify_request(SSL *s);
132 static const SSL_METHOD *dtls1_get_server_method(int ver)
134 if (ver == DTLS1_VERSION)
135 return(DTLSv1_server_method());
140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
142 ssl_undefined_function,
143 dtls1_get_server_method)
145 int dtls1_accept(SSL *s)
148 unsigned long Time=(unsigned long)time(NULL);
149 void (*cb)(const SSL *ssl,int type,int val)=NULL;
153 int new_state,state,skip=0;
155 RAND_add(&Time,sizeof(Time),0);
159 if (s->info_callback != NULL)
161 else if (s->ctx->info_callback != NULL)
162 cb=s->ctx->info_callback;
164 /* init things to blank */
166 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
170 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
180 case SSL_ST_RENEGOTIATE:
182 /* s->state=SSL_ST_ACCEPT; */
186 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
187 case SSL_ST_OK|SSL_ST_ACCEPT:
190 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
192 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
194 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
197 s->type=SSL_ST_ACCEPT;
199 if (s->init_buf == NULL)
201 if ((buf=BUF_MEM_new()) == NULL)
206 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
214 if (!ssl3_setup_buffers(s))
222 if (s->state != SSL_ST_RENEGOTIATE)
224 /* Ok, we now need to push on a buffering BIO so that
225 * the output is sent in a way that TCP likes :-)
227 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
229 ssl3_init_finished_mac(s);
230 s->state=SSL3_ST_SR_CLNT_HELLO_A;
231 s->ctx->stats.sess_accept++;
235 /* s->state == SSL_ST_RENEGOTIATE,
236 * we will just send a HelloRequest */
237 s->ctx->stats.sess_accept_renegotiate++;
238 s->state=SSL3_ST_SW_HELLO_REQ_A;
241 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
242 s->d1->send_cookie = 1;
244 s->d1->send_cookie = 0;
248 case SSL3_ST_SW_HELLO_REQ_A:
249 case SSL3_ST_SW_HELLO_REQ_B:
252 dtls1_start_timer(s);
253 ret=dtls1_send_hello_request(s);
254 if (ret <= 0) goto end;
255 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
256 s->state=SSL3_ST_SW_FLUSH;
259 ssl3_init_finished_mac(s);
262 case SSL3_ST_SW_HELLO_REQ_C:
266 case SSL3_ST_SR_CLNT_HELLO_A:
267 case SSL3_ST_SR_CLNT_HELLO_B:
268 case SSL3_ST_SR_CLNT_HELLO_C:
271 ret=ssl3_get_client_hello(s);
272 if (ret <= 0) goto end;
276 if (s->d1->send_cookie)
277 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
279 s->state = SSL3_ST_SW_SRVR_HELLO_A;
284 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
285 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
287 dtls1_start_timer(s);
288 ret = dtls1_send_hello_verify_request(s);
289 if ( ret <= 0) goto end;
290 s->d1->send_cookie = 0;
291 s->state=SSL3_ST_SW_FLUSH;
292 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
294 /* HelloVerifyRequest resets Finished MAC */
295 if (s->version != DTLS1_BAD_VER)
296 ssl3_init_finished_mac(s);
299 case SSL3_ST_SW_SRVR_HELLO_A:
300 case SSL3_ST_SW_SRVR_HELLO_B:
301 dtls1_start_timer(s);
302 ret=dtls1_send_server_hello(s);
303 if (ret <= 0) goto end;
306 s->state=SSL3_ST_SW_CHANGE_A;
308 s->state=SSL3_ST_SW_CERT_A;
312 case SSL3_ST_SW_CERT_A:
313 case SSL3_ST_SW_CERT_B:
314 /* Check if it is anon DH or normal PSK */
315 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
316 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
318 dtls1_start_timer(s);
319 ret=dtls1_send_server_certificate(s);
320 if (ret <= 0) goto end;
324 s->state=SSL3_ST_SW_KEY_EXCH_A;
328 case SSL3_ST_SW_KEY_EXCH_A:
329 case SSL3_ST_SW_KEY_EXCH_B:
330 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
332 /* clear this, it may get reset by
333 * send_server_key_exchange */
334 if ((s->options & SSL_OP_EPHEMERAL_RSA)
335 #ifndef OPENSSL_NO_KRB5
336 && !(alg_k & SSL_kKRB5)
337 #endif /* OPENSSL_NO_KRB5 */
339 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
340 * even when forbidden by protocol specs
341 * (handshake may fail as clients are not required to
342 * be able to handle this) */
343 s->s3->tmp.use_rsa_tmp=1;
345 s->s3->tmp.use_rsa_tmp=0;
347 /* only send if a DH key exchange or
348 * RSA but we have a sign only certificate */
349 if (s->s3->tmp.use_rsa_tmp
350 /* PSK: send ServerKeyExchange if PSK identity
351 * hint if provided */
352 #ifndef OPENSSL_NO_PSK
353 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
355 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
356 || (alg_k & SSL_kEECDH)
357 || ((alg_k & SSL_kRSA)
358 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
359 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
360 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
366 dtls1_start_timer(s);
367 ret=dtls1_send_server_key_exchange(s);
368 if (ret <= 0) goto end;
373 s->state=SSL3_ST_SW_CERT_REQ_A;
377 case SSL3_ST_SW_CERT_REQ_A:
378 case SSL3_ST_SW_CERT_REQ_B:
379 if (/* don't request cert unless asked for it: */
380 !(s->verify_mode & SSL_VERIFY_PEER) ||
381 /* if SSL_VERIFY_CLIENT_ONCE is set,
382 * don't request cert during re-negotiation: */
383 ((s->session->peer != NULL) &&
384 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
385 /* never request cert in anonymous ciphersuites
386 * (see section "Certificate request" in SSL 3 drafts
387 * and in RFC 2246): */
388 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
389 /* ... except when the application insists on verification
390 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
391 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
392 /* never request cert in Kerberos ciphersuites */
393 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
394 /* With normal PSK Certificates and
395 * Certificate Requests are omitted */
396 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
398 /* no cert request */
400 s->s3->tmp.cert_request=0;
401 s->state=SSL3_ST_SW_SRVR_DONE_A;
405 s->s3->tmp.cert_request=1;
406 dtls1_start_timer(s);
407 ret=dtls1_send_certificate_request(s);
408 if (ret <= 0) goto end;
409 #ifndef NETSCAPE_HANG_BUG
410 s->state=SSL3_ST_SW_SRVR_DONE_A;
412 s->state=SSL3_ST_SW_FLUSH;
413 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
419 case SSL3_ST_SW_SRVR_DONE_A:
420 case SSL3_ST_SW_SRVR_DONE_B:
421 dtls1_start_timer(s);
422 ret=dtls1_send_server_done(s);
423 if (ret <= 0) goto end;
424 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
425 s->state=SSL3_ST_SW_FLUSH;
429 case SSL3_ST_SW_FLUSH:
430 /* number of bytes to be flushed */
431 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
434 s->rwstate=SSL_WRITING;
435 num1=BIO_flush(s->wbio);
436 if (num1 <= 0) { ret= -1; goto end; }
437 s->rwstate=SSL_NOTHING;
440 s->state=s->s3->tmp.next_state;
443 case SSL3_ST_SR_CERT_A:
444 case SSL3_ST_SR_CERT_B:
445 /* Check for second client hello (MS SGC) */
446 ret = ssl3_check_client_hello(s);
451 s->state = SSL3_ST_SR_CLNT_HELLO_C;
453 /* could be sent for a DH cert, even if we
454 * have not asked for it :-) */
455 ret=ssl3_get_client_certificate(s);
456 if (ret <= 0) goto end;
459 s->state=SSL3_ST_SR_KEY_EXCH_A;
463 case SSL3_ST_SR_KEY_EXCH_A:
464 case SSL3_ST_SR_KEY_EXCH_B:
465 ret=ssl3_get_client_key_exchange(s);
466 if (ret <= 0) goto end;
468 s->state=SSL3_ST_SR_CERT_VRFY_A;
473 /* For the ECDH ciphersuites when
474 * the client sends its ECDH pub key in
475 * a certificate, the CertificateVerify
476 * message is not sent.
478 s->state=SSL3_ST_SR_FINISHED_A;
483 s->state=SSL3_ST_SR_CERT_VRFY_A;
486 /* We need to get hashes here so if there is
487 * a client cert, it can be verified */
488 s->method->ssl3_enc->cert_verify_mac(s,
490 &(s->s3->tmp.cert_verify_md[0]));
491 s->method->ssl3_enc->cert_verify_mac(s,
493 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
497 case SSL3_ST_SR_CERT_VRFY_A:
498 case SSL3_ST_SR_CERT_VRFY_B:
500 /* we should decide if we expected this one */
501 ret=ssl3_get_cert_verify(s);
502 if (ret <= 0) goto end;
505 s->state=SSL3_ST_SR_FINISHED_A;
509 case SSL3_ST_SR_FINISHED_A:
510 case SSL3_ST_SR_FINISHED_B:
511 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
512 SSL3_ST_SR_FINISHED_B);
513 if (ret <= 0) goto end;
518 s->state=SSL3_ST_SW_CHANGE_A;
522 case SSL3_ST_SW_CHANGE_A:
523 case SSL3_ST_SW_CHANGE_B:
525 s->session->cipher=s->s3->tmp.new_cipher;
526 if (!s->method->ssl3_enc->setup_key_block(s))
527 { ret= -1; goto end; }
529 ret=dtls1_send_change_cipher_spec(s,
530 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
532 if (ret <= 0) goto end;
533 s->state=SSL3_ST_SW_FINISHED_A;
536 if (!s->method->ssl3_enc->change_cipher_state(s,
537 SSL3_CHANGE_CIPHER_SERVER_WRITE))
543 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
546 case SSL3_ST_SW_FINISHED_A:
547 case SSL3_ST_SW_FINISHED_B:
548 ret=dtls1_send_finished(s,
549 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
550 s->method->ssl3_enc->server_finished_label,
551 s->method->ssl3_enc->server_finished_label_len);
552 if (ret <= 0) goto end;
553 s->state=SSL3_ST_SW_FLUSH;
555 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
557 s->s3->tmp.next_state=SSL_ST_OK;
562 /* clean a few things up */
563 ssl3_cleanup_key_block(s);
566 BUF_MEM_free(s->init_buf);
570 /* remove buffering on output */
571 ssl_free_wbio_buffer(s);
575 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
577 /* actually not necessarily a 'new' session unless
578 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
582 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
584 s->ctx->stats.sess_accept_good++;
586 s->handshake_func=dtls1_accept;
588 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
593 /* done handshaking, next message is client hello */
594 s->d1->handshake_read_seq = 0;
595 /* next message is server hello */
596 s->d1->handshake_write_seq = 0;
597 s->d1->next_handshake_write_seq = 0;
602 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
608 if (!s->s3->tmp.reuse_message && !skip)
612 if ((ret=BIO_flush(s->wbio)) <= 0)
617 if ((cb != NULL) && (s->state != state))
621 cb(s,SSL_CB_ACCEPT_LOOP,1);
628 /* BIO_flush(s->wbio); */
632 cb(s,SSL_CB_ACCEPT_EXIT,ret);
636 int dtls1_send_hello_request(SSL *s)
640 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
642 p=(unsigned char *)s->init_buf->data;
643 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
645 s->state=SSL3_ST_SW_HELLO_REQ_B;
646 /* number of bytes to write */
647 s->init_num=DTLS1_HM_HEADER_LENGTH;
650 /* no need to buffer this message, since there are no retransmit
654 /* SSL3_ST_SW_HELLO_REQ_B */
655 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
658 int dtls1_send_hello_verify_request(SSL *s)
660 unsigned int msg_len;
661 unsigned char *msg, *buf, *p;
663 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
665 buf = (unsigned char *)s->init_buf->data;
667 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
668 *(p++) = s->version >> 8;
669 *(p++) = s->version & 0xFF;
671 if (s->ctx->app_gen_cookie_cb != NULL &&
672 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
673 &(s->d1->cookie_len)) == 0)
675 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
678 /* else the cookie is assumed to have
679 * been initialized by the application */
681 *(p++) = (unsigned char) s->d1->cookie_len;
682 memcpy(p, s->d1->cookie, s->d1->cookie_len);
683 p += s->d1->cookie_len;
686 dtls1_set_message_header(s, buf,
687 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
689 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
690 /* number of bytes to write */
694 /* buffer the message to handle re-xmits */
695 dtls1_buffer_message(s, 0);
698 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
699 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
702 int dtls1_send_server_hello(SSL *s)
708 unsigned long l,Time;
710 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
712 buf=(unsigned char *)s->init_buf->data;
713 p=s->s3->server_random;
714 Time=(unsigned long)time(NULL); /* Time */
716 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
717 /* Do the message type and length last */
718 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
720 *(p++)=s->version>>8;
721 *(p++)=s->version&0xff;
724 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
727 /* now in theory we have 3 options to sending back the
728 * session id. If it is a re-use, we send back the
729 * old session-id, if it is a new session, we send
730 * back the new session-id or we send back a 0 length
731 * session-id if we want it to be single use.
732 * Currently I will not implement the '0' length session-id
733 * 12-Jan-98 - I'll now support the '0' length stuff.
735 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
736 s->session->session_id_length=0;
738 sl=s->session->session_id_length;
739 if (sl > sizeof s->session->session_id)
741 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
745 memcpy(p,s->session->session_id,sl);
749 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
752 /* put the compression method */
753 #ifdef OPENSSL_NO_COMP
756 if (s->s3->tmp.new_compression == NULL)
759 *(p++)=s->s3->tmp.new_compression->id;
766 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
768 s->state=SSL3_ST_SW_SRVR_HELLO_B;
769 /* number of bytes to write */
773 /* buffer the message to handle re-xmits */
774 dtls1_buffer_message(s, 0);
777 /* SSL3_ST_SW_SRVR_HELLO_B */
778 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
781 int dtls1_send_server_done(SSL *s)
785 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
787 p=(unsigned char *)s->init_buf->data;
790 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
792 s->state=SSL3_ST_SW_SRVR_DONE_B;
793 /* number of bytes to write */
794 s->init_num=DTLS1_HM_HEADER_LENGTH;
797 /* buffer the message to handle re-xmits */
798 dtls1_buffer_message(s, 0);
801 /* SSL3_ST_SW_SRVR_DONE_B */
802 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
805 int dtls1_send_server_key_exchange(SSL *s)
807 #ifndef OPENSSL_NO_RSA
811 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
814 #ifndef OPENSSL_NO_DH
817 #ifndef OPENSSL_NO_ECDH
818 EC_KEY *ecdh=NULL, *ecdhp;
819 unsigned char *encodedPoint = NULL;
822 BN_CTX *bn_ctx = NULL;
835 EVP_MD_CTX_init(&md_ctx);
836 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
838 type=s->s3->tmp.new_cipher->algorithm_mkey;
843 r[0]=r[1]=r[2]=r[3]=NULL;
845 #ifndef OPENSSL_NO_RSA
849 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
851 rsa=s->cert->rsa_tmp_cb(s,
852 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
853 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
856 al=SSL_AD_HANDSHAKE_FAILURE;
857 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
865 al=SSL_AD_HANDSHAKE_FAILURE;
866 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
871 s->s3->tmp.use_rsa_tmp=1;
875 #ifndef OPENSSL_NO_DH
879 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
880 dhp=s->cert->dh_tmp_cb(s,
881 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
882 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
885 al=SSL_AD_HANDSHAKE_FAILURE;
886 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
890 if (s->s3->tmp.dh != NULL)
893 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
897 if ((dh=DHparams_dup(dhp)) == NULL)
899 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
904 if ((dhp->pub_key == NULL ||
905 dhp->priv_key == NULL ||
906 (s->options & SSL_OP_SINGLE_DH_USE)))
908 if(!DH_generate_key(dh))
910 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
917 dh->pub_key=BN_dup(dhp->pub_key);
918 dh->priv_key=BN_dup(dhp->priv_key);
919 if ((dh->pub_key == NULL) ||
920 (dh->priv_key == NULL))
922 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
932 #ifndef OPENSSL_NO_ECDH
933 if (type & SSL_kEECDH)
935 const EC_GROUP *group;
937 ecdhp=cert->ecdh_tmp;
938 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
940 ecdhp=s->cert->ecdh_tmp_cb(s,
941 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
942 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
946 al=SSL_AD_HANDSHAKE_FAILURE;
947 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
951 if (s->s3->tmp.ecdh != NULL)
953 EC_KEY_free(s->s3->tmp.ecdh);
954 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
958 /* Duplicate the ECDH structure. */
961 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
964 if (!EC_KEY_up_ref(ecdhp))
966 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
971 s->s3->tmp.ecdh=ecdh;
972 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
973 (EC_KEY_get0_private_key(ecdh) == NULL) ||
974 (s->options & SSL_OP_SINGLE_ECDH_USE))
976 if(!EC_KEY_generate_key(ecdh))
978 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
983 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
984 (EC_KEY_get0_public_key(ecdh) == NULL) ||
985 (EC_KEY_get0_private_key(ecdh) == NULL))
987 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
991 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
992 (EC_GROUP_get_degree(group) > 163))
994 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
998 /* XXX: For now, we only support ephemeral ECDH
999 * keys over named (not generic) curves. For
1000 * supported named curves, curve_id is non-zero.
1003 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1006 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1010 /* Encode the public key.
1011 * First check the size of encoding and
1012 * allocate memory accordingly.
1014 encodedlen = EC_POINT_point2oct(group,
1015 EC_KEY_get0_public_key(ecdh),
1016 POINT_CONVERSION_UNCOMPRESSED,
1019 encodedPoint = (unsigned char *)
1020 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1021 bn_ctx = BN_CTX_new();
1022 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1024 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1029 encodedlen = EC_POINT_point2oct(group,
1030 EC_KEY_get0_public_key(ecdh),
1031 POINT_CONVERSION_UNCOMPRESSED,
1032 encodedPoint, encodedlen, bn_ctx);
1034 if (encodedlen == 0)
1036 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1040 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1042 /* XXX: For now, we only support named (not
1043 * generic) curves in ECDH ephemeral key exchanges.
1044 * In this situation, we need four additional bytes
1045 * to encode the entire ServerECDHParams
1050 /* We'll generate the serverKeyExchange message
1051 * explicitly so we can set these to NULLs
1059 #endif /* !OPENSSL_NO_ECDH */
1060 #ifndef OPENSSL_NO_PSK
1061 if (type & SSL_kPSK)
1063 /* reserve size for record length and PSK identity hint*/
1064 n+=2+strlen(s->ctx->psk_identity_hint);
1067 #endif /* !OPENSSL_NO_PSK */
1069 al=SSL_AD_HANDSHAKE_FAILURE;
1070 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1073 for (i=0; r[i] != NULL; i++)
1075 nr[i]=BN_num_bytes(r[i]);
1079 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1080 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1082 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1085 al=SSL_AD_DECODE_ERROR;
1088 kn=EVP_PKEY_size(pkey);
1096 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1098 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1101 d=(unsigned char *)s->init_buf->data;
1102 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1104 for (i=0; r[i] != NULL; i++)
1111 #ifndef OPENSSL_NO_ECDH
1112 if (type & SSL_kEECDH)
1114 /* XXX: For now, we only support named (not generic) curves.
1115 * In this situation, the serverKeyExchange message has:
1116 * [1 byte CurveType], [2 byte CurveName]
1117 * [1 byte length of encoded point], followed by
1118 * the actual encoded point itself
1120 *p = NAMED_CURVE_TYPE;
1128 memcpy((unsigned char*)p,
1129 (unsigned char *)encodedPoint,
1131 OPENSSL_free(encodedPoint);
1136 #ifndef OPENSSL_NO_PSK
1137 if (type & SSL_kPSK)
1139 /* copy PSK identity hint */
1140 s2n(strlen(s->ctx->psk_identity_hint), p);
1141 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1142 p+=strlen(s->ctx->psk_identity_hint);
1149 /* n is the length of the params, they start at
1150 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1152 #ifndef OPENSSL_NO_RSA
1153 if (pkey->type == EVP_PKEY_RSA)
1157 for (num=2; num > 0; num--)
1159 EVP_DigestInit_ex(&md_ctx,(num == 2)
1160 ?s->ctx->md5:s->ctx->sha1, NULL);
1161 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1162 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1163 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1164 EVP_DigestFinal_ex(&md_ctx,q,
1165 (unsigned int *)&i);
1169 if (RSA_sign(NID_md5_sha1, md_buf, j,
1170 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1172 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1180 #if !defined(OPENSSL_NO_DSA)
1181 if (pkey->type == EVP_PKEY_DSA)
1184 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1185 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1186 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1187 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1188 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1189 (unsigned int *)&i,pkey))
1191 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1199 #if !defined(OPENSSL_NO_ECDSA)
1200 if (pkey->type == EVP_PKEY_EC)
1202 /* let's do ECDSA */
1203 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1204 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1205 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1206 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1207 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1208 (unsigned int *)&i,pkey))
1210 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1219 /* Is this error check actually needed? */
1220 al=SSL_AD_HANDSHAKE_FAILURE;
1221 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1226 d = dtls1_set_message_header(s, d,
1227 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1229 /* we should now have things packed up, so lets send
1231 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1234 /* buffer the message to handle re-xmits */
1235 dtls1_buffer_message(s, 0);
1238 s->state = SSL3_ST_SW_KEY_EXCH_B;
1239 EVP_MD_CTX_cleanup(&md_ctx);
1240 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1242 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1244 #ifndef OPENSSL_NO_ECDH
1245 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1246 BN_CTX_free(bn_ctx);
1248 EVP_MD_CTX_cleanup(&md_ctx);
1252 int dtls1_send_certificate_request(SSL *s)
1254 unsigned char *p,*d;
1256 STACK_OF(X509_NAME) *sk=NULL;
1259 unsigned int msg_len;
1261 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1265 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1267 /* get the list of acceptable cert types */
1269 n=ssl3_get_req_cert_type(s,p);
1278 sk=SSL_get_client_CA_list(s);
1282 for (i=0; i<sk_X509_NAME_num(sk); i++)
1284 name=sk_X509_NAME_value(sk,i);
1285 j=i2d_X509_NAME(name,NULL);
1286 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1288 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1291 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1292 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1295 i2d_X509_NAME(name,&p);
1302 i2d_X509_NAME(name,&p);
1303 j-=2; s2n(j,d); j+=2;
1309 /* else no CA names */
1310 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1313 d=(unsigned char *)buf->data;
1314 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1316 s2n(s->d1->handshake_write_seq,d);
1317 s->d1->handshake_write_seq++;
1319 /* we should now have things packed up, so lets send
1322 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1324 #ifdef NETSCAPE_HANG_BUG
1325 /* XXX: what to do about this? */
1326 p=(unsigned char *)s->init_buf->data + s->init_num;
1329 *(p++)=SSL3_MT_SERVER_DONE;
1336 /* XDTLS: set message header ? */
1337 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1338 dtls1_set_message_header(s, (void *)s->init_buf->data,
1339 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1341 /* buffer the message to handle re-xmits */
1342 dtls1_buffer_message(s, 0);
1344 s->state = SSL3_ST_SW_CERT_REQ_B;
1347 /* SSL3_ST_SW_CERT_REQ_B */
1348 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1353 int dtls1_send_server_certificate(SSL *s)
1358 if (s->state == SSL3_ST_SW_CERT_A)
1360 x=ssl_get_server_send_cert(s);
1363 /* VRS: allow null cert if auth == KRB5 */
1364 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1365 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1367 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1372 l=dtls1_output_cert_chain(s,x);
1373 s->state=SSL3_ST_SW_CERT_B;
1377 /* buffer the message to handle re-xmits */
1378 dtls1_buffer_message(s, 0);
1381 /* SSL3_ST_SW_CERT_B */
1382 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));