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 s->d1->change_cipher_spec_ok = 1;
501 /* we should decide if we expected this one */
502 ret=ssl3_get_cert_verify(s);
503 if (ret <= 0) goto end;
506 s->state=SSL3_ST_SR_FINISHED_A;
510 case SSL3_ST_SR_FINISHED_A:
511 case SSL3_ST_SR_FINISHED_B:
512 s->d1->change_cipher_spec_ok = 1;
513 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
514 SSL3_ST_SR_FINISHED_B);
515 if (ret <= 0) goto end;
520 s->state=SSL3_ST_SW_CHANGE_A;
524 case SSL3_ST_SW_CHANGE_A:
525 case SSL3_ST_SW_CHANGE_B:
527 s->session->cipher=s->s3->tmp.new_cipher;
528 if (!s->method->ssl3_enc->setup_key_block(s))
529 { ret= -1; goto end; }
531 ret=dtls1_send_change_cipher_spec(s,
532 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
534 if (ret <= 0) goto end;
535 s->state=SSL3_ST_SW_FINISHED_A;
538 if (!s->method->ssl3_enc->change_cipher_state(s,
539 SSL3_CHANGE_CIPHER_SERVER_WRITE))
545 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
548 case SSL3_ST_SW_FINISHED_A:
549 case SSL3_ST_SW_FINISHED_B:
550 ret=dtls1_send_finished(s,
551 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
552 s->method->ssl3_enc->server_finished_label,
553 s->method->ssl3_enc->server_finished_label_len);
554 if (ret <= 0) goto end;
555 s->state=SSL3_ST_SW_FLUSH;
557 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
559 s->s3->tmp.next_state=SSL_ST_OK;
564 /* clean a few things up */
565 ssl3_cleanup_key_block(s);
568 BUF_MEM_free(s->init_buf);
572 /* remove buffering on output */
573 ssl_free_wbio_buffer(s);
577 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
579 /* actually not necessarily a 'new' session unless
580 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
584 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
586 s->ctx->stats.sess_accept_good++;
588 s->handshake_func=dtls1_accept;
590 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
595 /* done handshaking, next message is client hello */
596 s->d1->handshake_read_seq = 0;
597 /* next message is server hello */
598 s->d1->handshake_write_seq = 0;
599 s->d1->next_handshake_write_seq = 0;
604 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
610 if (!s->s3->tmp.reuse_message && !skip)
614 if ((ret=BIO_flush(s->wbio)) <= 0)
619 if ((cb != NULL) && (s->state != state))
623 cb(s,SSL_CB_ACCEPT_LOOP,1);
630 /* BIO_flush(s->wbio); */
634 cb(s,SSL_CB_ACCEPT_EXIT,ret);
638 int dtls1_send_hello_request(SSL *s)
642 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
644 p=(unsigned char *)s->init_buf->data;
645 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
647 s->state=SSL3_ST_SW_HELLO_REQ_B;
648 /* number of bytes to write */
649 s->init_num=DTLS1_HM_HEADER_LENGTH;
652 /* no need to buffer this message, since there are no retransmit
656 /* SSL3_ST_SW_HELLO_REQ_B */
657 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
660 int dtls1_send_hello_verify_request(SSL *s)
662 unsigned int msg_len;
663 unsigned char *msg, *buf, *p;
665 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
667 buf = (unsigned char *)s->init_buf->data;
669 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
670 *(p++) = s->version >> 8;
671 *(p++) = s->version & 0xFF;
673 if (s->ctx->app_gen_cookie_cb != NULL &&
674 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
675 &(s->d1->cookie_len)) == 0)
677 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
680 /* else the cookie is assumed to have
681 * been initialized by the application */
683 *(p++) = (unsigned char) s->d1->cookie_len;
684 memcpy(p, s->d1->cookie, s->d1->cookie_len);
685 p += s->d1->cookie_len;
688 dtls1_set_message_header(s, buf,
689 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
691 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
692 /* number of bytes to write */
696 /* buffer the message to handle re-xmits */
697 dtls1_buffer_message(s, 0);
700 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
701 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
704 int dtls1_send_server_hello(SSL *s)
710 unsigned long l,Time;
712 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
714 buf=(unsigned char *)s->init_buf->data;
715 p=s->s3->server_random;
716 Time=(unsigned long)time(NULL); /* Time */
718 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
719 /* Do the message type and length last */
720 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
722 *(p++)=s->version>>8;
723 *(p++)=s->version&0xff;
726 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
729 /* now in theory we have 3 options to sending back the
730 * session id. If it is a re-use, we send back the
731 * old session-id, if it is a new session, we send
732 * back the new session-id or we send back a 0 length
733 * session-id if we want it to be single use.
734 * Currently I will not implement the '0' length session-id
735 * 12-Jan-98 - I'll now support the '0' length stuff.
737 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
738 s->session->session_id_length=0;
740 sl=s->session->session_id_length;
741 if (sl > sizeof s->session->session_id)
743 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
747 memcpy(p,s->session->session_id,sl);
751 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
754 /* put the compression method */
755 #ifdef OPENSSL_NO_COMP
758 if (s->s3->tmp.new_compression == NULL)
761 *(p++)=s->s3->tmp.new_compression->id;
768 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
770 s->state=SSL3_ST_SW_SRVR_HELLO_B;
771 /* number of bytes to write */
775 /* buffer the message to handle re-xmits */
776 dtls1_buffer_message(s, 0);
779 /* SSL3_ST_SW_SRVR_HELLO_B */
780 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
783 int dtls1_send_server_done(SSL *s)
787 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
789 p=(unsigned char *)s->init_buf->data;
792 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
794 s->state=SSL3_ST_SW_SRVR_DONE_B;
795 /* number of bytes to write */
796 s->init_num=DTLS1_HM_HEADER_LENGTH;
799 /* buffer the message to handle re-xmits */
800 dtls1_buffer_message(s, 0);
803 /* SSL3_ST_SW_SRVR_DONE_B */
804 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
807 int dtls1_send_server_key_exchange(SSL *s)
809 #ifndef OPENSSL_NO_RSA
813 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
816 #ifndef OPENSSL_NO_DH
819 #ifndef OPENSSL_NO_ECDH
820 EC_KEY *ecdh=NULL, *ecdhp;
821 unsigned char *encodedPoint = NULL;
824 BN_CTX *bn_ctx = NULL;
837 EVP_MD_CTX_init(&md_ctx);
838 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
840 type=s->s3->tmp.new_cipher->algorithm_mkey;
845 r[0]=r[1]=r[2]=r[3]=NULL;
847 #ifndef OPENSSL_NO_RSA
851 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
853 rsa=s->cert->rsa_tmp_cb(s,
854 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
855 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
858 al=SSL_AD_HANDSHAKE_FAILURE;
859 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
867 al=SSL_AD_HANDSHAKE_FAILURE;
868 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
873 s->s3->tmp.use_rsa_tmp=1;
877 #ifndef OPENSSL_NO_DH
881 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
882 dhp=s->cert->dh_tmp_cb(s,
883 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
884 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
887 al=SSL_AD_HANDSHAKE_FAILURE;
888 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
892 if (s->s3->tmp.dh != NULL)
895 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
899 if ((dh=DHparams_dup(dhp)) == NULL)
901 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
906 if ((dhp->pub_key == NULL ||
907 dhp->priv_key == NULL ||
908 (s->options & SSL_OP_SINGLE_DH_USE)))
910 if(!DH_generate_key(dh))
912 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
919 dh->pub_key=BN_dup(dhp->pub_key);
920 dh->priv_key=BN_dup(dhp->priv_key);
921 if ((dh->pub_key == NULL) ||
922 (dh->priv_key == NULL))
924 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
934 #ifndef OPENSSL_NO_ECDH
935 if (type & SSL_kEECDH)
937 const EC_GROUP *group;
939 ecdhp=cert->ecdh_tmp;
940 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
942 ecdhp=s->cert->ecdh_tmp_cb(s,
943 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
944 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
948 al=SSL_AD_HANDSHAKE_FAILURE;
949 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
953 if (s->s3->tmp.ecdh != NULL)
955 EC_KEY_free(s->s3->tmp.ecdh);
956 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
960 /* Duplicate the ECDH structure. */
963 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
966 if (!EC_KEY_up_ref(ecdhp))
968 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
973 s->s3->tmp.ecdh=ecdh;
974 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
975 (EC_KEY_get0_private_key(ecdh) == NULL) ||
976 (s->options & SSL_OP_SINGLE_ECDH_USE))
978 if(!EC_KEY_generate_key(ecdh))
980 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
985 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
986 (EC_KEY_get0_public_key(ecdh) == NULL) ||
987 (EC_KEY_get0_private_key(ecdh) == NULL))
989 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
993 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
994 (EC_GROUP_get_degree(group) > 163))
996 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1000 /* XXX: For now, we only support ephemeral ECDH
1001 * keys over named (not generic) curves. For
1002 * supported named curves, curve_id is non-zero.
1005 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1008 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1012 /* Encode the public key.
1013 * First check the size of encoding and
1014 * allocate memory accordingly.
1016 encodedlen = EC_POINT_point2oct(group,
1017 EC_KEY_get0_public_key(ecdh),
1018 POINT_CONVERSION_UNCOMPRESSED,
1021 encodedPoint = (unsigned char *)
1022 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1023 bn_ctx = BN_CTX_new();
1024 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1026 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1031 encodedlen = EC_POINT_point2oct(group,
1032 EC_KEY_get0_public_key(ecdh),
1033 POINT_CONVERSION_UNCOMPRESSED,
1034 encodedPoint, encodedlen, bn_ctx);
1036 if (encodedlen == 0)
1038 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1042 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1044 /* XXX: For now, we only support named (not
1045 * generic) curves in ECDH ephemeral key exchanges.
1046 * In this situation, we need four additional bytes
1047 * to encode the entire ServerECDHParams
1052 /* We'll generate the serverKeyExchange message
1053 * explicitly so we can set these to NULLs
1061 #endif /* !OPENSSL_NO_ECDH */
1062 #ifndef OPENSSL_NO_PSK
1063 if (type & SSL_kPSK)
1065 /* reserve size for record length and PSK identity hint*/
1066 n+=2+strlen(s->ctx->psk_identity_hint);
1069 #endif /* !OPENSSL_NO_PSK */
1071 al=SSL_AD_HANDSHAKE_FAILURE;
1072 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1075 for (i=0; r[i] != NULL; i++)
1077 nr[i]=BN_num_bytes(r[i]);
1081 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1082 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1084 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1087 al=SSL_AD_DECODE_ERROR;
1090 kn=EVP_PKEY_size(pkey);
1098 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1100 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1103 d=(unsigned char *)s->init_buf->data;
1104 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1106 for (i=0; r[i] != NULL; i++)
1113 #ifndef OPENSSL_NO_ECDH
1114 if (type & SSL_kEECDH)
1116 /* XXX: For now, we only support named (not generic) curves.
1117 * In this situation, the serverKeyExchange message has:
1118 * [1 byte CurveType], [2 byte CurveName]
1119 * [1 byte length of encoded point], followed by
1120 * the actual encoded point itself
1122 *p = NAMED_CURVE_TYPE;
1130 memcpy((unsigned char*)p,
1131 (unsigned char *)encodedPoint,
1133 OPENSSL_free(encodedPoint);
1138 #ifndef OPENSSL_NO_PSK
1139 if (type & SSL_kPSK)
1141 /* copy PSK identity hint */
1142 s2n(strlen(s->ctx->psk_identity_hint), p);
1143 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1144 p+=strlen(s->ctx->psk_identity_hint);
1151 /* n is the length of the params, they start at
1152 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1154 #ifndef OPENSSL_NO_RSA
1155 if (pkey->type == EVP_PKEY_RSA)
1159 for (num=2; num > 0; num--)
1161 EVP_DigestInit_ex(&md_ctx,(num == 2)
1162 ?s->ctx->md5:s->ctx->sha1, NULL);
1163 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1164 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1165 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1166 EVP_DigestFinal_ex(&md_ctx,q,
1167 (unsigned int *)&i);
1171 if (RSA_sign(NID_md5_sha1, md_buf, j,
1172 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1174 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1182 #if !defined(OPENSSL_NO_DSA)
1183 if (pkey->type == EVP_PKEY_DSA)
1186 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1187 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1188 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1189 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1190 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1191 (unsigned int *)&i,pkey))
1193 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1201 #if !defined(OPENSSL_NO_ECDSA)
1202 if (pkey->type == EVP_PKEY_EC)
1204 /* let's do ECDSA */
1205 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1206 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1207 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1208 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1209 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1210 (unsigned int *)&i,pkey))
1212 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1221 /* Is this error check actually needed? */
1222 al=SSL_AD_HANDSHAKE_FAILURE;
1223 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1228 d = dtls1_set_message_header(s, d,
1229 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1231 /* we should now have things packed up, so lets send
1233 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1236 /* buffer the message to handle re-xmits */
1237 dtls1_buffer_message(s, 0);
1240 s->state = SSL3_ST_SW_KEY_EXCH_B;
1241 EVP_MD_CTX_cleanup(&md_ctx);
1242 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1244 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1246 #ifndef OPENSSL_NO_ECDH
1247 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1248 BN_CTX_free(bn_ctx);
1250 EVP_MD_CTX_cleanup(&md_ctx);
1254 int dtls1_send_certificate_request(SSL *s)
1256 unsigned char *p,*d;
1258 STACK_OF(X509_NAME) *sk=NULL;
1261 unsigned int msg_len;
1263 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1267 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1269 /* get the list of acceptable cert types */
1271 n=ssl3_get_req_cert_type(s,p);
1280 sk=SSL_get_client_CA_list(s);
1284 for (i=0; i<sk_X509_NAME_num(sk); i++)
1286 name=sk_X509_NAME_value(sk,i);
1287 j=i2d_X509_NAME(name,NULL);
1288 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1290 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1293 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1294 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1297 i2d_X509_NAME(name,&p);
1304 i2d_X509_NAME(name,&p);
1305 j-=2; s2n(j,d); j+=2;
1311 /* else no CA names */
1312 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1315 d=(unsigned char *)buf->data;
1316 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1318 s2n(s->d1->handshake_write_seq,d);
1319 s->d1->handshake_write_seq++;
1321 /* we should now have things packed up, so lets send
1324 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1326 #ifdef NETSCAPE_HANG_BUG
1327 /* XXX: what to do about this? */
1328 p=(unsigned char *)s->init_buf->data + s->init_num;
1331 *(p++)=SSL3_MT_SERVER_DONE;
1338 /* XDTLS: set message header ? */
1339 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1340 dtls1_set_message_header(s, (void *)s->init_buf->data,
1341 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1343 /* buffer the message to handle re-xmits */
1344 dtls1_buffer_message(s, 0);
1346 s->state = SSL3_ST_SW_CERT_REQ_B;
1349 /* SSL3_ST_SW_CERT_REQ_B */
1350 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1355 int dtls1_send_server_certificate(SSL *s)
1360 if (s->state == SSL3_ST_SW_CERT_A)
1362 x=ssl_get_server_send_cert(s);
1365 /* VRS: allow null cert if auth == KRB5 */
1366 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1367 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1369 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1374 l=dtls1_output_cert_chain(s,x);
1375 s->state=SSL3_ST_SW_CERT_B;
1379 /* buffer the message to handle re-xmits */
1380 dtls1_buffer_message(s, 0);
1383 /* SSL3_ST_SW_CERT_B */
1384 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));