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;
243 case SSL3_ST_SW_HELLO_REQ_A:
244 case SSL3_ST_SW_HELLO_REQ_B:
247 dtls1_start_timer(s);
248 ret=dtls1_send_hello_request(s);
249 if (ret <= 0) goto end;
250 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
251 s->state=SSL3_ST_SW_FLUSH;
254 ssl3_init_finished_mac(s);
257 case SSL3_ST_SW_HELLO_REQ_C:
261 case SSL3_ST_SR_CLNT_HELLO_A:
262 case SSL3_ST_SR_CLNT_HELLO_B:
263 case SSL3_ST_SR_CLNT_HELLO_C:
266 ret=ssl3_get_client_hello(s);
267 if (ret <= 0) goto end;
271 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
272 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
274 s->state = SSL3_ST_SW_SRVR_HELLO_A;
279 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
280 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
282 dtls1_start_timer(s);
283 ret = dtls1_send_hello_verify_request(s);
284 if ( ret <= 0) goto end;
285 s->state=SSL3_ST_SW_FLUSH;
286 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
288 /* HelloVerifyRequest resets Finished MAC */
289 if (s->version != DTLS1_BAD_VER)
290 ssl3_init_finished_mac(s);
293 case SSL3_ST_SW_SRVR_HELLO_A:
294 case SSL3_ST_SW_SRVR_HELLO_B:
295 dtls1_start_timer(s);
296 ret=dtls1_send_server_hello(s);
297 if (ret <= 0) goto end;
300 s->state=SSL3_ST_SW_CHANGE_A;
302 s->state=SSL3_ST_SW_CERT_A;
306 case SSL3_ST_SW_CERT_A:
307 case SSL3_ST_SW_CERT_B:
308 /* Check if it is anon DH or normal PSK */
309 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
310 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
312 dtls1_start_timer(s);
313 ret=dtls1_send_server_certificate(s);
314 if (ret <= 0) goto end;
318 s->state=SSL3_ST_SW_KEY_EXCH_A;
322 case SSL3_ST_SW_KEY_EXCH_A:
323 case SSL3_ST_SW_KEY_EXCH_B:
324 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
326 /* clear this, it may get reset by
327 * send_server_key_exchange */
328 if ((s->options & SSL_OP_EPHEMERAL_RSA)
329 #ifndef OPENSSL_NO_KRB5
330 && !(alg_k & SSL_kKRB5)
331 #endif /* OPENSSL_NO_KRB5 */
333 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
334 * even when forbidden by protocol specs
335 * (handshake may fail as clients are not required to
336 * be able to handle this) */
337 s->s3->tmp.use_rsa_tmp=1;
339 s->s3->tmp.use_rsa_tmp=0;
341 /* only send if a DH key exchange or
342 * RSA but we have a sign only certificate */
343 if (s->s3->tmp.use_rsa_tmp
344 /* PSK: send ServerKeyExchange if PSK identity
345 * hint if provided */
346 #ifndef OPENSSL_NO_PSK
347 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
349 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
350 || (alg_k & SSL_kEECDH)
351 || ((alg_k & SSL_kRSA)
352 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
353 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
354 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
360 dtls1_start_timer(s);
361 ret=dtls1_send_server_key_exchange(s);
362 if (ret <= 0) goto end;
367 s->state=SSL3_ST_SW_CERT_REQ_A;
371 case SSL3_ST_SW_CERT_REQ_A:
372 case SSL3_ST_SW_CERT_REQ_B:
373 if (/* don't request cert unless asked for it: */
374 !(s->verify_mode & SSL_VERIFY_PEER) ||
375 /* if SSL_VERIFY_CLIENT_ONCE is set,
376 * don't request cert during re-negotiation: */
377 ((s->session->peer != NULL) &&
378 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
379 /* never request cert in anonymous ciphersuites
380 * (see section "Certificate request" in SSL 3 drafts
381 * and in RFC 2246): */
382 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
383 /* ... except when the application insists on verification
384 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
385 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
386 /* never request cert in Kerberos ciphersuites */
387 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
388 /* With normal PSK Certificates and
389 * Certificate Requests are omitted */
390 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
392 /* no cert request */
394 s->s3->tmp.cert_request=0;
395 s->state=SSL3_ST_SW_SRVR_DONE_A;
399 s->s3->tmp.cert_request=1;
400 dtls1_start_timer(s);
401 ret=dtls1_send_certificate_request(s);
402 if (ret <= 0) goto end;
403 #ifndef NETSCAPE_HANG_BUG
404 s->state=SSL3_ST_SW_SRVR_DONE_A;
406 s->state=SSL3_ST_SW_FLUSH;
407 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
413 case SSL3_ST_SW_SRVR_DONE_A:
414 case SSL3_ST_SW_SRVR_DONE_B:
415 dtls1_start_timer(s);
416 ret=dtls1_send_server_done(s);
417 if (ret <= 0) goto end;
418 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
419 s->state=SSL3_ST_SW_FLUSH;
423 case SSL3_ST_SW_FLUSH:
424 /* number of bytes to be flushed */
425 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
428 s->rwstate=SSL_WRITING;
429 num1=BIO_flush(s->wbio);
430 if (num1 <= 0) { ret= -1; goto end; }
431 s->rwstate=SSL_NOTHING;
434 s->state=s->s3->tmp.next_state;
437 case SSL3_ST_SR_CERT_A:
438 case SSL3_ST_SR_CERT_B:
439 /* Check for second client hello (MS SGC) */
440 ret = ssl3_check_client_hello(s);
445 s->state = SSL3_ST_SR_CLNT_HELLO_C;
447 /* could be sent for a DH cert, even if we
448 * have not asked for it :-) */
449 ret=ssl3_get_client_certificate(s);
450 if (ret <= 0) goto end;
453 s->state=SSL3_ST_SR_KEY_EXCH_A;
457 case SSL3_ST_SR_KEY_EXCH_A:
458 case SSL3_ST_SR_KEY_EXCH_B:
459 ret=ssl3_get_client_key_exchange(s);
460 if (ret <= 0) goto end;
462 s->state=SSL3_ST_SR_CERT_VRFY_A;
467 /* For the ECDH ciphersuites when
468 * the client sends its ECDH pub key in
469 * a certificate, the CertificateVerify
470 * message is not sent.
472 s->state=SSL3_ST_SR_FINISHED_A;
477 s->state=SSL3_ST_SR_CERT_VRFY_A;
480 /* We need to get hashes here so if there is
481 * a client cert, it can be verified */
482 s->method->ssl3_enc->cert_verify_mac(s,
484 &(s->s3->tmp.cert_verify_md[0]));
485 s->method->ssl3_enc->cert_verify_mac(s,
487 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
491 case SSL3_ST_SR_CERT_VRFY_A:
492 case SSL3_ST_SR_CERT_VRFY_B:
494 s->d1->change_cipher_spec_ok = 1;
495 /* we should decide if we expected this one */
496 ret=ssl3_get_cert_verify(s);
497 if (ret <= 0) goto end;
500 s->state=SSL3_ST_SR_FINISHED_A;
504 case SSL3_ST_SR_FINISHED_A:
505 case SSL3_ST_SR_FINISHED_B:
506 s->d1->change_cipher_spec_ok = 1;
507 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
508 SSL3_ST_SR_FINISHED_B);
509 if (ret <= 0) goto end;
514 s->state=SSL3_ST_SW_CHANGE_A;
518 case SSL3_ST_SW_CHANGE_A:
519 case SSL3_ST_SW_CHANGE_B:
521 s->session->cipher=s->s3->tmp.new_cipher;
522 if (!s->method->ssl3_enc->setup_key_block(s))
523 { ret= -1; goto end; }
525 ret=dtls1_send_change_cipher_spec(s,
526 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
528 if (ret <= 0) goto end;
529 s->state=SSL3_ST_SW_FINISHED_A;
532 if (!s->method->ssl3_enc->change_cipher_state(s,
533 SSL3_CHANGE_CIPHER_SERVER_WRITE))
539 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
542 case SSL3_ST_SW_FINISHED_A:
543 case SSL3_ST_SW_FINISHED_B:
544 ret=dtls1_send_finished(s,
545 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
546 s->method->ssl3_enc->server_finished_label,
547 s->method->ssl3_enc->server_finished_label_len);
548 if (ret <= 0) goto end;
549 s->state=SSL3_ST_SW_FLUSH;
551 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
553 s->s3->tmp.next_state=SSL_ST_OK;
558 /* clean a few things up */
559 ssl3_cleanup_key_block(s);
562 BUF_MEM_free(s->init_buf);
566 /* remove buffering on output */
567 ssl_free_wbio_buffer(s);
571 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
573 /* actually not necessarily a 'new' session unless
574 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
578 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
580 s->ctx->stats.sess_accept_good++;
582 s->handshake_func=dtls1_accept;
584 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
589 /* done handshaking, next message is client hello */
590 s->d1->handshake_read_seq = 0;
591 /* next message is server hello */
592 s->d1->handshake_write_seq = 0;
593 s->d1->next_handshake_write_seq = 0;
598 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
604 if (!s->s3->tmp.reuse_message && !skip)
608 if ((ret=BIO_flush(s->wbio)) <= 0)
613 if ((cb != NULL) && (s->state != state))
617 cb(s,SSL_CB_ACCEPT_LOOP,1);
624 /* BIO_flush(s->wbio); */
628 cb(s,SSL_CB_ACCEPT_EXIT,ret);
632 int dtls1_send_hello_request(SSL *s)
636 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
638 p=(unsigned char *)s->init_buf->data;
639 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
641 s->state=SSL3_ST_SW_HELLO_REQ_B;
642 /* number of bytes to write */
643 s->init_num=DTLS1_HM_HEADER_LENGTH;
646 /* no need to buffer this message, since there are no retransmit
650 /* SSL3_ST_SW_HELLO_REQ_B */
651 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
654 int dtls1_send_hello_verify_request(SSL *s)
656 unsigned int msg_len;
657 unsigned char *msg, *buf, *p;
659 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
661 buf = (unsigned char *)s->init_buf->data;
663 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
664 *(p++) = s->version >> 8;
665 *(p++) = s->version & 0xFF;
667 if (s->ctx->app_gen_cookie_cb == NULL ||
668 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
669 &(s->d1->cookie_len)) == 0)
671 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
675 *(p++) = (unsigned char) s->d1->cookie_len;
676 memcpy(p, s->d1->cookie, s->d1->cookie_len);
677 p += s->d1->cookie_len;
680 dtls1_set_message_header(s, buf,
681 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
683 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
684 /* number of bytes to write */
688 /* buffer the message to handle re-xmits */
689 dtls1_buffer_message(s, 0);
692 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
693 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
696 int dtls1_send_server_hello(SSL *s)
702 unsigned long l,Time;
704 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
706 buf=(unsigned char *)s->init_buf->data;
707 p=s->s3->server_random;
708 Time=(unsigned long)time(NULL); /* Time */
710 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
711 /* Do the message type and length last */
712 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
714 *(p++)=s->version>>8;
715 *(p++)=s->version&0xff;
718 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
721 /* now in theory we have 3 options to sending back the
722 * session id. If it is a re-use, we send back the
723 * old session-id, if it is a new session, we send
724 * back the new session-id or we send back a 0 length
725 * session-id if we want it to be single use.
726 * Currently I will not implement the '0' length session-id
727 * 12-Jan-98 - I'll now support the '0' length stuff.
729 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
730 s->session->session_id_length=0;
732 sl=s->session->session_id_length;
733 if (sl > sizeof s->session->session_id)
735 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
739 memcpy(p,s->session->session_id,sl);
743 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
746 /* put the compression method */
747 #ifdef OPENSSL_NO_COMP
750 if (s->s3->tmp.new_compression == NULL)
753 *(p++)=s->s3->tmp.new_compression->id;
760 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
762 s->state=SSL3_ST_SW_SRVR_HELLO_B;
763 /* number of bytes to write */
767 /* buffer the message to handle re-xmits */
768 dtls1_buffer_message(s, 0);
771 /* SSL3_ST_SW_SRVR_HELLO_B */
772 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
775 int dtls1_send_server_done(SSL *s)
779 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
781 p=(unsigned char *)s->init_buf->data;
784 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
786 s->state=SSL3_ST_SW_SRVR_DONE_B;
787 /* number of bytes to write */
788 s->init_num=DTLS1_HM_HEADER_LENGTH;
791 /* buffer the message to handle re-xmits */
792 dtls1_buffer_message(s, 0);
795 /* SSL3_ST_SW_SRVR_DONE_B */
796 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
799 int dtls1_send_server_key_exchange(SSL *s)
801 #ifndef OPENSSL_NO_RSA
805 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
808 #ifndef OPENSSL_NO_DH
811 #ifndef OPENSSL_NO_ECDH
812 EC_KEY *ecdh=NULL, *ecdhp;
813 unsigned char *encodedPoint = NULL;
816 BN_CTX *bn_ctx = NULL;
829 EVP_MD_CTX_init(&md_ctx);
830 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
832 type=s->s3->tmp.new_cipher->algorithm_mkey;
837 r[0]=r[1]=r[2]=r[3]=NULL;
839 #ifndef OPENSSL_NO_RSA
843 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
845 rsa=s->cert->rsa_tmp_cb(s,
846 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
847 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
850 al=SSL_AD_HANDSHAKE_FAILURE;
851 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
859 al=SSL_AD_HANDSHAKE_FAILURE;
860 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
865 s->s3->tmp.use_rsa_tmp=1;
869 #ifndef OPENSSL_NO_DH
873 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
874 dhp=s->cert->dh_tmp_cb(s,
875 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
876 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
879 al=SSL_AD_HANDSHAKE_FAILURE;
880 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
884 if (s->s3->tmp.dh != NULL)
887 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
891 if ((dh=DHparams_dup(dhp)) == NULL)
893 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
898 if ((dhp->pub_key == NULL ||
899 dhp->priv_key == NULL ||
900 (s->options & SSL_OP_SINGLE_DH_USE)))
902 if(!DH_generate_key(dh))
904 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
911 dh->pub_key=BN_dup(dhp->pub_key);
912 dh->priv_key=BN_dup(dhp->priv_key);
913 if ((dh->pub_key == NULL) ||
914 (dh->priv_key == NULL))
916 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
926 #ifndef OPENSSL_NO_ECDH
927 if (type & SSL_kEECDH)
929 const EC_GROUP *group;
931 ecdhp=cert->ecdh_tmp;
932 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
934 ecdhp=s->cert->ecdh_tmp_cb(s,
935 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
936 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
940 al=SSL_AD_HANDSHAKE_FAILURE;
941 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
945 if (s->s3->tmp.ecdh != NULL)
947 EC_KEY_free(s->s3->tmp.ecdh);
948 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
952 /* Duplicate the ECDH structure. */
955 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
958 if (!EC_KEY_up_ref(ecdhp))
960 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
965 s->s3->tmp.ecdh=ecdh;
966 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
967 (EC_KEY_get0_private_key(ecdh) == NULL) ||
968 (s->options & SSL_OP_SINGLE_ECDH_USE))
970 if(!EC_KEY_generate_key(ecdh))
972 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
977 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
978 (EC_KEY_get0_public_key(ecdh) == NULL) ||
979 (EC_KEY_get0_private_key(ecdh) == NULL))
981 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
985 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
986 (EC_GROUP_get_degree(group) > 163))
988 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
992 /* XXX: For now, we only support ephemeral ECDH
993 * keys over named (not generic) curves. For
994 * supported named curves, curve_id is non-zero.
997 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1000 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1004 /* Encode the public key.
1005 * First check the size of encoding and
1006 * allocate memory accordingly.
1008 encodedlen = EC_POINT_point2oct(group,
1009 EC_KEY_get0_public_key(ecdh),
1010 POINT_CONVERSION_UNCOMPRESSED,
1013 encodedPoint = (unsigned char *)
1014 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1015 bn_ctx = BN_CTX_new();
1016 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1018 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1023 encodedlen = EC_POINT_point2oct(group,
1024 EC_KEY_get0_public_key(ecdh),
1025 POINT_CONVERSION_UNCOMPRESSED,
1026 encodedPoint, encodedlen, bn_ctx);
1028 if (encodedlen == 0)
1030 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1034 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1036 /* XXX: For now, we only support named (not
1037 * generic) curves in ECDH ephemeral key exchanges.
1038 * In this situation, we need four additional bytes
1039 * to encode the entire ServerECDHParams
1044 /* We'll generate the serverKeyExchange message
1045 * explicitly so we can set these to NULLs
1053 #endif /* !OPENSSL_NO_ECDH */
1054 #ifndef OPENSSL_NO_PSK
1055 if (type & SSL_kPSK)
1057 /* reserve size for record length and PSK identity hint*/
1058 n+=2+strlen(s->ctx->psk_identity_hint);
1061 #endif /* !OPENSSL_NO_PSK */
1063 al=SSL_AD_HANDSHAKE_FAILURE;
1064 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1067 for (i=0; r[i] != NULL; i++)
1069 nr[i]=BN_num_bytes(r[i]);
1073 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1074 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1076 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1079 al=SSL_AD_DECODE_ERROR;
1082 kn=EVP_PKEY_size(pkey);
1090 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1092 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1095 d=(unsigned char *)s->init_buf->data;
1096 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1098 for (i=0; r[i] != NULL; i++)
1105 #ifndef OPENSSL_NO_ECDH
1106 if (type & SSL_kEECDH)
1108 /* XXX: For now, we only support named (not generic) curves.
1109 * In this situation, the serverKeyExchange message has:
1110 * [1 byte CurveType], [2 byte CurveName]
1111 * [1 byte length of encoded point], followed by
1112 * the actual encoded point itself
1114 *p = NAMED_CURVE_TYPE;
1122 memcpy((unsigned char*)p,
1123 (unsigned char *)encodedPoint,
1125 OPENSSL_free(encodedPoint);
1130 #ifndef OPENSSL_NO_PSK
1131 if (type & SSL_kPSK)
1133 /* copy PSK identity hint */
1134 s2n(strlen(s->ctx->psk_identity_hint), p);
1135 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1136 p+=strlen(s->ctx->psk_identity_hint);
1143 /* n is the length of the params, they start at
1144 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1146 #ifndef OPENSSL_NO_RSA
1147 if (pkey->type == EVP_PKEY_RSA)
1151 for (num=2; num > 0; num--)
1153 EVP_DigestInit_ex(&md_ctx,(num == 2)
1154 ?s->ctx->md5:s->ctx->sha1, NULL);
1155 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1156 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1157 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1158 EVP_DigestFinal_ex(&md_ctx,q,
1159 (unsigned int *)&i);
1163 if (RSA_sign(NID_md5_sha1, md_buf, j,
1164 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1166 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1174 #if !defined(OPENSSL_NO_DSA)
1175 if (pkey->type == EVP_PKEY_DSA)
1178 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1179 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1180 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1181 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1182 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1183 (unsigned int *)&i,pkey))
1185 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1193 #if !defined(OPENSSL_NO_ECDSA)
1194 if (pkey->type == EVP_PKEY_EC)
1196 /* let's do ECDSA */
1197 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1198 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1199 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1200 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1201 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1202 (unsigned int *)&i,pkey))
1204 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1213 /* Is this error check actually needed? */
1214 al=SSL_AD_HANDSHAKE_FAILURE;
1215 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1220 d = dtls1_set_message_header(s, d,
1221 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1223 /* we should now have things packed up, so lets send
1225 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1228 /* buffer the message to handle re-xmits */
1229 dtls1_buffer_message(s, 0);
1232 s->state = SSL3_ST_SW_KEY_EXCH_B;
1233 EVP_MD_CTX_cleanup(&md_ctx);
1234 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1236 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1238 #ifndef OPENSSL_NO_ECDH
1239 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1240 BN_CTX_free(bn_ctx);
1242 EVP_MD_CTX_cleanup(&md_ctx);
1246 int dtls1_send_certificate_request(SSL *s)
1248 unsigned char *p,*d;
1250 STACK_OF(X509_NAME) *sk=NULL;
1253 unsigned int msg_len;
1255 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1259 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1261 /* get the list of acceptable cert types */
1263 n=ssl3_get_req_cert_type(s,p);
1272 sk=SSL_get_client_CA_list(s);
1276 for (i=0; i<sk_X509_NAME_num(sk); i++)
1278 name=sk_X509_NAME_value(sk,i);
1279 j=i2d_X509_NAME(name,NULL);
1280 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1282 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1285 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1286 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1289 i2d_X509_NAME(name,&p);
1296 i2d_X509_NAME(name,&p);
1297 j-=2; s2n(j,d); j+=2;
1303 /* else no CA names */
1304 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1307 d=(unsigned char *)buf->data;
1308 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1310 s2n(s->d1->handshake_write_seq,d);
1311 s->d1->handshake_write_seq++;
1313 /* we should now have things packed up, so lets send
1316 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1318 #ifdef NETSCAPE_HANG_BUG
1319 /* XXX: what to do about this? */
1320 p=(unsigned char *)s->init_buf->data + s->init_num;
1323 *(p++)=SSL3_MT_SERVER_DONE;
1330 /* XDTLS: set message header ? */
1331 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1332 dtls1_set_message_header(s, (void *)s->init_buf->data,
1333 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1335 /* buffer the message to handle re-xmits */
1336 dtls1_buffer_message(s, 0);
1338 s->state = SSL3_ST_SW_CERT_REQ_B;
1341 /* SSL3_ST_SW_CERT_REQ_B */
1342 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1347 int dtls1_send_server_certificate(SSL *s)
1352 if (s->state == SSL3_ST_SW_CERT_A)
1354 x=ssl_get_server_send_cert(s);
1357 /* VRS: allow null cert if auth == KRB5 */
1358 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1359 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1361 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1366 l=dtls1_output_cert_chain(s,x);
1367 s->state=SSL3_ST_SW_CERT_B;
1371 /* buffer the message to handle re-xmits */
1372 dtls1_buffer_message(s, 0);
1375 /* SSL3_ST_SW_CERT_B */
1376 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));