3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2005 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 #ifndef OPENSSL_NO_DH
125 #include <openssl/dh.h>
128 static SSL_METHOD *dtls1_get_server_method(int ver);
129 static int dtls1_send_hello_verify_request(SSL *s);
131 static SSL_METHOD *dtls1_get_server_method(int ver)
133 if (ver == DTLS1_VERSION)
134 return(DTLSv1_server_method());
139 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
141 ssl_undefined_function,
142 dtls1_get_server_method)
144 int dtls1_accept(SSL *s)
147 unsigned long l,Time=(unsigned long)time(NULL);
148 void (*cb)(const SSL *ssl,int type,int val)=NULL;
151 int new_state,state,skip=0;
153 RAND_add(&Time,sizeof(Time),0);
157 if (s->info_callback != NULL)
159 else if (s->ctx->info_callback != NULL)
160 cb=s->ctx->info_callback;
162 /* init things to blank */
164 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
168 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
178 case SSL_ST_RENEGOTIATE:
180 /* s->state=SSL_ST_ACCEPT; */
184 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
185 case SSL_ST_OK|SSL_ST_ACCEPT:
188 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
190 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
192 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
195 s->type=SSL_ST_ACCEPT;
197 if (s->init_buf == NULL)
199 if ((buf=BUF_MEM_new()) == NULL)
204 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
212 if (!ssl3_setup_buffers(s))
220 if (s->state != SSL_ST_RENEGOTIATE)
222 /* Ok, we now need to push on a buffering BIO so that
223 * the output is sent in a way that TCP likes :-)
225 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
227 ssl3_init_finished_mac(s);
228 s->state=SSL3_ST_SR_CLNT_HELLO_A;
229 s->ctx->stats.sess_accept++;
233 /* s->state == SSL_ST_RENEGOTIATE,
234 * we will just send a HelloRequest */
235 s->ctx->stats.sess_accept_renegotiate++;
236 s->state=SSL3_ST_SW_HELLO_REQ_A;
241 case SSL3_ST_SW_HELLO_REQ_A:
242 case SSL3_ST_SW_HELLO_REQ_B:
245 dtls1_start_timer(s);
246 ret=dtls1_send_hello_request(s);
247 if (ret <= 0) goto end;
248 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
249 s->state=SSL3_ST_SW_FLUSH;
252 ssl3_init_finished_mac(s);
255 case SSL3_ST_SW_HELLO_REQ_C:
259 case SSL3_ST_SR_CLNT_HELLO_A:
260 case SSL3_ST_SR_CLNT_HELLO_B:
261 case SSL3_ST_SR_CLNT_HELLO_C:
264 ret=ssl3_get_client_hello(s);
265 if (ret <= 0) goto end;
269 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
270 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
272 s->state = SSL3_ST_SW_SRVR_HELLO_A;
276 /* If we're just listening, stop here */
277 if (s->d1->listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
286 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
287 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
289 dtls1_start_timer(s);
290 ret = dtls1_send_hello_verify_request(s);
291 if ( ret <= 0) goto end;
292 s->state=SSL3_ST_SW_FLUSH;
293 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
295 /* HelloVerifyRequests resets Finished MAC */
296 if (s->client_version != DTLS1_BAD_VER)
297 ssl3_init_finished_mac(s);
300 case SSL3_ST_SW_SRVR_HELLO_A:
301 case SSL3_ST_SW_SRVR_HELLO_B:
302 dtls1_start_timer(s);
303 ret=dtls1_send_server_hello(s);
304 if (ret <= 0) goto end;
307 s->state=SSL3_ST_SW_CHANGE_A;
309 s->state=SSL3_ST_SW_CERT_A;
313 case SSL3_ST_SW_CERT_A:
314 case SSL3_ST_SW_CERT_B:
315 /* Check if it is anon DH */
316 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
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 l=s->s3->tmp.new_cipher->algorithms;
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
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, fortezza or
348 * RSA but we have a sign only certificate */
349 if (s->s3->tmp.use_rsa_tmp
350 || (l & (SSL_DH|SSL_kFZA))
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->algorithms & 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->algorithms & SSL_aKRB5))
389 /* no cert request */
391 s->s3->tmp.cert_request=0;
392 s->state=SSL3_ST_SW_SRVR_DONE_A;
396 s->s3->tmp.cert_request=1;
397 dtls1_start_timer(s);
398 ret=dtls1_send_certificate_request(s);
399 if (ret <= 0) goto end;
400 #ifndef NETSCAPE_HANG_BUG
401 s->state=SSL3_ST_SW_SRVR_DONE_A;
403 s->state=SSL3_ST_SW_FLUSH;
404 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
410 case SSL3_ST_SW_SRVR_DONE_A:
411 case SSL3_ST_SW_SRVR_DONE_B:
412 dtls1_start_timer(s);
413 ret=dtls1_send_server_done(s);
414 if (ret <= 0) goto end;
415 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
416 s->state=SSL3_ST_SW_FLUSH;
420 case SSL3_ST_SW_FLUSH:
421 /* number of bytes to be flushed */
422 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
425 s->rwstate=SSL_WRITING;
426 num1=BIO_flush(s->wbio);
427 if (num1 <= 0) { ret= -1; goto end; }
428 s->rwstate=SSL_NOTHING;
431 s->state=s->s3->tmp.next_state;
434 case SSL3_ST_SR_CERT_A:
435 case SSL3_ST_SR_CERT_B:
436 /* Check for second client hello (MS SGC) */
437 ret = ssl3_check_client_hello(s);
442 s->state = SSL3_ST_SR_CLNT_HELLO_C;
444 /* could be sent for a DH cert, even if we
445 * have not asked for it :-) */
446 ret=ssl3_get_client_certificate(s);
447 if (ret <= 0) goto end;
450 s->state=SSL3_ST_SR_KEY_EXCH_A;
454 case SSL3_ST_SR_KEY_EXCH_A:
455 case SSL3_ST_SR_KEY_EXCH_B:
456 ret=ssl3_get_client_key_exchange(s);
457 if (ret <= 0) goto end;
459 s->state=SSL3_ST_SR_CERT_VRFY_A;
462 /* We need to get hashes here so if there is
463 * a client cert, it can be verified */
464 s->method->ssl3_enc->cert_verify_mac(s,
465 &(s->s3->finish_dgst1),
466 &(s->s3->tmp.cert_verify_md[0]));
467 s->method->ssl3_enc->cert_verify_mac(s,
468 &(s->s3->finish_dgst2),
469 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
473 case SSL3_ST_SR_CERT_VRFY_A:
474 case SSL3_ST_SR_CERT_VRFY_B:
476 s->d1->change_cipher_spec_ok = 1;
477 /* we should decide if we expected this one */
478 ret=ssl3_get_cert_verify(s);
479 if (ret <= 0) goto end;
482 s->state=SSL3_ST_SR_FINISHED_A;
486 case SSL3_ST_SR_FINISHED_A:
487 case SSL3_ST_SR_FINISHED_B:
488 s->d1->change_cipher_spec_ok = 1;
489 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
490 SSL3_ST_SR_FINISHED_B);
491 if (ret <= 0) goto end;
496 s->state=SSL3_ST_SW_CHANGE_A;
500 case SSL3_ST_SW_CHANGE_A:
501 case SSL3_ST_SW_CHANGE_B:
503 s->session->cipher=s->s3->tmp.new_cipher;
504 if (!s->method->ssl3_enc->setup_key_block(s))
505 { ret= -1; goto end; }
507 ret=dtls1_send_change_cipher_spec(s,
508 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
510 if (ret <= 0) goto end;
511 s->state=SSL3_ST_SW_FINISHED_A;
514 if (!s->method->ssl3_enc->change_cipher_state(s,
515 SSL3_CHANGE_CIPHER_SERVER_WRITE))
521 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
524 case SSL3_ST_SW_FINISHED_A:
525 case SSL3_ST_SW_FINISHED_B:
526 ret=dtls1_send_finished(s,
527 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
528 s->method->ssl3_enc->server_finished_label,
529 s->method->ssl3_enc->server_finished_label_len);
530 if (ret <= 0) goto end;
531 s->state=SSL3_ST_SW_FLUSH;
533 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
535 s->s3->tmp.next_state=SSL_ST_OK;
540 /* clean a few things up */
541 ssl3_cleanup_key_block(s);
544 BUF_MEM_free(s->init_buf);
548 /* remove buffering on output */
549 ssl_free_wbio_buffer(s);
553 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
555 /* actually not necessarily a 'new' session unless
556 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
560 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
562 s->ctx->stats.sess_accept_good++;
564 s->handshake_func=dtls1_accept;
566 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
571 /* done handshaking, next message is client hello */
572 s->d1->handshake_read_seq = 0;
573 /* next message is server hello */
574 s->d1->handshake_write_seq = 0;
575 s->d1->next_handshake_write_seq = 0;
580 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
586 if (!s->s3->tmp.reuse_message && !skip)
590 if ((ret=BIO_flush(s->wbio)) <= 0)
595 if ((cb != NULL) && (s->state != state))
599 cb(s,SSL_CB_ACCEPT_LOOP,1);
606 /* BIO_flush(s->wbio); */
610 cb(s,SSL_CB_ACCEPT_EXIT,ret);
614 int dtls1_send_hello_request(SSL *s)
618 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
620 p=(unsigned char *)s->init_buf->data;
621 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
623 s->state=SSL3_ST_SW_HELLO_REQ_B;
624 /* number of bytes to write */
625 s->init_num=DTLS1_HM_HEADER_LENGTH;
628 /* no need to buffer this message, since there are no retransmit
632 /* SSL3_ST_SW_HELLO_REQ_B */
633 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
636 int dtls1_send_hello_verify_request(SSL *s)
638 unsigned int msg_len;
639 unsigned char *msg, *buf, *p;
641 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
643 buf = (unsigned char *)s->init_buf->data;
645 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
646 if (s->client_version == DTLS1_BAD_VER)
647 *(p++) = DTLS1_BAD_VER>>8,
648 *(p++) = DTLS1_BAD_VER&0xff;
650 *(p++) = s->version >> 8,
651 *(p++) = s->version & 0xFF;
653 if (s->ctx->app_gen_cookie_cb == NULL ||
654 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
655 &(s->d1->cookie_len)) == 0)
657 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
661 *(p++) = (unsigned char) s->d1->cookie_len;
662 memcpy(p, s->d1->cookie, s->d1->cookie_len);
663 p += s->d1->cookie_len;
666 dtls1_set_message_header(s, buf,
667 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
669 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
670 /* number of bytes to write */
674 /* buffer the message to handle re-xmits */
675 dtls1_buffer_message(s, 0);
678 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
679 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
682 int dtls1_send_server_hello(SSL *s)
688 unsigned long l,Time;
690 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
692 buf=(unsigned char *)s->init_buf->data;
693 p=s->s3->server_random;
694 Time=(unsigned long)time(NULL); /* Time */
696 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
697 /* Do the message type and length last */
698 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
700 if (s->client_version == DTLS1_BAD_VER)
701 *(p++)=DTLS1_BAD_VER>>8,
702 *(p++)=DTLS1_BAD_VER&0xff;
704 *(p++)=s->version>>8,
705 *(p++)=s->version&0xff;
708 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
711 /* now in theory we have 3 options to sending back the
712 * session id. If it is a re-use, we send back the
713 * old session-id, if it is a new session, we send
714 * back the new session-id or we send back a 0 length
715 * session-id if we want it to be single use.
716 * Currently I will not implement the '0' length session-id
717 * 12-Jan-98 - I'll now support the '0' length stuff.
719 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
720 s->session->session_id_length=0;
722 sl=s->session->session_id_length;
723 if (sl > sizeof s->session->session_id)
725 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
729 memcpy(p,s->session->session_id,sl);
733 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
736 /* put the compression method */
737 #ifdef OPENSSL_NO_COMP
740 if (s->s3->tmp.new_compression == NULL)
743 *(p++)=s->s3->tmp.new_compression->id;
750 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
752 s->state=SSL3_ST_SW_SRVR_HELLO_B;
753 /* number of bytes to write */
757 /* buffer the message to handle re-xmits */
758 dtls1_buffer_message(s, 0);
761 /* SSL3_ST_SW_SRVR_HELLO_B */
762 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
765 int dtls1_send_server_done(SSL *s)
769 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
771 p=(unsigned char *)s->init_buf->data;
774 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
776 s->state=SSL3_ST_SW_SRVR_DONE_B;
777 /* number of bytes to write */
778 s->init_num=DTLS1_HM_HEADER_LENGTH;
781 /* buffer the message to handle re-xmits */
782 dtls1_buffer_message(s, 0);
785 /* SSL3_ST_SW_SRVR_DONE_B */
786 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
789 int dtls1_send_server_key_exchange(SSL *s)
791 #ifndef OPENSSL_NO_RSA
795 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
798 #ifndef OPENSSL_NO_DH
812 EVP_MD_CTX_init(&md_ctx);
813 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
815 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
820 r[0]=r[1]=r[2]=r[3]=NULL;
822 #ifndef OPENSSL_NO_RSA
826 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
828 rsa=s->cert->rsa_tmp_cb(s,
829 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
830 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
833 al=SSL_AD_HANDSHAKE_FAILURE;
834 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
842 al=SSL_AD_HANDSHAKE_FAILURE;
843 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
848 s->s3->tmp.use_rsa_tmp=1;
852 #ifndef OPENSSL_NO_DH
856 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
857 dhp=s->cert->dh_tmp_cb(s,
858 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
859 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
862 al=SSL_AD_HANDSHAKE_FAILURE;
863 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
867 if (s->s3->tmp.dh != NULL)
870 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
874 if ((dh=DHparams_dup(dhp)) == NULL)
876 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
881 if ((dhp->pub_key == NULL ||
882 dhp->priv_key == NULL ||
883 (s->options & SSL_OP_SINGLE_DH_USE)))
885 if(!DH_generate_key(dh))
887 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
894 dh->pub_key=BN_dup(dhp->pub_key);
895 dh->priv_key=BN_dup(dhp->priv_key);
896 if ((dh->pub_key == NULL) ||
897 (dh->priv_key == NULL))
899 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
910 al=SSL_AD_HANDSHAKE_FAILURE;
911 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
914 for (i=0; r[i] != NULL; i++)
916 nr[i]=BN_num_bytes(r[i]);
920 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
922 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
925 al=SSL_AD_DECODE_ERROR;
928 kn=EVP_PKEY_size(pkey);
936 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
938 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
941 d=(unsigned char *)s->init_buf->data;
942 p= &(d[DTLS1_HM_HEADER_LENGTH]);
944 for (i=0; r[i] != NULL; i++)
954 /* n is the length of the params, they start at
955 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
957 #ifndef OPENSSL_NO_RSA
958 if (pkey->type == EVP_PKEY_RSA)
962 for (num=2; num > 0; num--)
964 EVP_DigestInit_ex(&md_ctx,(num == 2)
965 ?s->ctx->md5:s->ctx->sha1, NULL);
966 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
967 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
968 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
969 EVP_DigestFinal_ex(&md_ctx,q,
974 if (RSA_sign(NID_md5_sha1, md_buf, j,
975 &(p[2]), &u, pkey->pkey.rsa) <= 0)
977 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
985 #if !defined(OPENSSL_NO_DSA)
986 if (pkey->type == EVP_PKEY_DSA)
989 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
990 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
991 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
992 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
993 if (!EVP_SignFinal(&md_ctx,&(p[2]),
994 (unsigned int *)&i,pkey))
996 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1005 /* Is this error check actually needed? */
1006 al=SSL_AD_HANDSHAKE_FAILURE;
1007 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1012 d = dtls1_set_message_header(s, d,
1013 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1015 /* we should now have things packed up, so lets send
1017 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1020 /* buffer the message to handle re-xmits */
1021 dtls1_buffer_message(s, 0);
1024 s->state = SSL3_ST_SW_KEY_EXCH_B;
1025 EVP_MD_CTX_cleanup(&md_ctx);
1026 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1028 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1030 EVP_MD_CTX_cleanup(&md_ctx);
1034 int dtls1_send_certificate_request(SSL *s)
1036 unsigned char *p,*d;
1038 STACK_OF(X509_NAME) *sk=NULL;
1041 unsigned int msg_len;
1043 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1047 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1049 /* get the list of acceptable cert types */
1051 n=ssl3_get_req_cert_type(s,p);
1060 sk=SSL_get_client_CA_list(s);
1064 for (i=0; i<sk_X509_NAME_num(sk); i++)
1066 name=sk_X509_NAME_value(sk,i);
1067 j=i2d_X509_NAME(name,NULL);
1068 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1070 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1073 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1074 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1077 i2d_X509_NAME(name,&p);
1084 i2d_X509_NAME(name,&p);
1085 j-=2; s2n(j,d); j+=2;
1091 /* else no CA names */
1092 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1095 d=(unsigned char *)buf->data;
1096 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1098 s2n(s->d1->handshake_write_seq,d);
1099 s->d1->handshake_write_seq++;
1101 /* we should now have things packed up, so lets send
1104 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1106 #ifdef NETSCAPE_HANG_BUG
1107 /* XXX: what to do about this? */
1108 p=(unsigned char *)s->init_buf->data + s->init_num;
1111 *(p++)=SSL3_MT_SERVER_DONE;
1118 /* XDTLS: set message header ? */
1119 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1120 dtls1_set_message_header(s, (void *)s->init_buf->data,
1121 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1123 /* buffer the message to handle re-xmits */
1124 dtls1_buffer_message(s, 0);
1126 s->state = SSL3_ST_SW_CERT_REQ_B;
1129 /* SSL3_ST_SW_CERT_REQ_B */
1130 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1135 int dtls1_send_server_certificate(SSL *s)
1140 if (s->state == SSL3_ST_SW_CERT_A)
1142 x=ssl_get_server_send_cert(s);
1144 /* VRS: allow null cert if auth == KRB5 */
1145 (s->s3->tmp.new_cipher->algorithms
1146 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1147 != (SSL_aKRB5|SSL_kKRB5))
1149 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1153 l=dtls1_output_cert_chain(s,x);
1154 s->state=SSL3_ST_SW_CERT_B;
1158 /* buffer the message to handle re-xmits */
1159 dtls1_buffer_message(s, 0);
1162 /* SSL3_ST_SW_CERT_B */
1163 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));