1/* ssl/d1_clnt.c */
2/*
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5 */
6/* ====================================================================
7 * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    openssl-core@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com).  This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
61 *
62 * This package is an SSL implementation written
63 * by Eric Young (eay@cryptsoft.com).
64 * The implementation was written so as to conform with Netscapes SSL.
65 *
66 * This library is free for commercial and non-commercial use as long as
67 * the following conditions are aheared to.  The following conditions
68 * apply to all code found in this distribution, be it the RC4, RSA,
69 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
70 * included with this distribution is covered by the same copyright terms
71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
72 *
73 * Copyright remains Eric Young's, and as such any Copyright notices in
74 * the code are not to be removed.
75 * If this package is used in a product, Eric Young should be given attribution
76 * as the author of the parts of the library used.
77 * This can be in the form of a textual message at program startup or
78 * in documentation (online or textual) provided with the package.
79 *
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
82 * are met:
83 * 1. Redistributions of source code must retain the copyright
84 *    notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 *    notice, this list of conditions and the following disclaimer in the
87 *    documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 *    must display the following acknowledgement:
90 *    "This product includes cryptographic software written by
91 *     Eric Young (eay@cryptsoft.com)"
92 *    The word 'cryptographic' can be left out if the rouines from the library
93 *    being used are not cryptographic related :-).
94 * 4. If you include any Windows specific code (or a derivative thereof) from
95 *    the apps directory (application code) you must include an acknowledgement:
96 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
97 *
98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
108 * SUCH DAMAGE.
109 *
110 * The licence and distribution terms for any publically available version or
111 * derivative of this code cannot be changed.  i.e. this code cannot simply be
112 * copied and put under another distribution licence
113 * [including the GNU Public Licence.]
114 */
115
116#include <stdio.h>
117#include "ssl_locl.h"
118#ifndef OPENSSL_NO_KRB5
119#include "kssl_lcl.h"
120#endif
121#include <openssl/buffer.h>
122#include <openssl/rand.h>
123#include <openssl/objects.h>
124#include <openssl/evp.h>
125#include <openssl/md5.h>
126#include <openssl/bn.h>
127#ifndef OPENSSL_NO_DH
128#include <openssl/dh.h>
129#endif
130
131static const SSL_METHOD *dtls1_get_client_method(int ver);
132static int dtls1_get_hello_verify(SSL *s);
133
134static const SSL_METHOD *dtls1_get_client_method(int ver)
135	{
136	if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
137		return(DTLSv1_client_method());
138	else
139		return(NULL);
140	}
141
142IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
143			ssl_undefined_function,
144			dtls1_connect,
145			dtls1_get_client_method)
146
147int dtls1_connect(SSL *s)
148	{
149	BUF_MEM *buf=NULL;
150	unsigned long Time=(unsigned long)time(NULL);
151	void (*cb)(const SSL *ssl,int type,int val)=NULL;
152	int ret= -1;
153	int new_state,state,skip=0;
154#ifndef OPENSSL_NO_SCTP
155	unsigned char sctpauthkey[64];
156	char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
157#endif
158
159	RAND_add(&Time,sizeof(Time),0);
160	ERR_clear_error();
161	clear_sys_error();
162
163	if (s->info_callback != NULL)
164		cb=s->info_callback;
165	else if (s->ctx->info_callback != NULL)
166		cb=s->ctx->info_callback;
167
168	s->in_handshake++;
169	if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
170
171#ifndef OPENSSL_NO_SCTP
172	/* Notify SCTP BIO socket to enter handshake
173	 * mode and prevent stream identifier other
174	 * than 0. Will be ignored if no SCTP is used.
175	 */
176	BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
177#endif
178
179#ifndef OPENSSL_NO_HEARTBEATS
180	/* If we're awaiting a HeartbeatResponse, pretend we
181	 * already got and don't await it anymore, because
182	 * Heartbeats don't make sense during handshakes anyway.
183	 */
184	if (s->tlsext_hb_pending)
185		{
186		dtls1_stop_timer(s);
187		s->tlsext_hb_pending = 0;
188		s->tlsext_hb_seq++;
189		}
190#endif
191
192	for (;;)
193		{
194		state=s->state;
195
196		switch(s->state)
197			{
198		case SSL_ST_RENEGOTIATE:
199			s->renegotiate=1;
200			s->state=SSL_ST_CONNECT;
201			s->ctx->stats.sess_connect_renegotiate++;
202			/* break */
203		case SSL_ST_BEFORE:
204		case SSL_ST_CONNECT:
205		case SSL_ST_BEFORE|SSL_ST_CONNECT:
206		case SSL_ST_OK|SSL_ST_CONNECT:
207
208			s->server=0;
209			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
210
211			if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
212			    (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
213				{
214				SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
215				ret = -1;
216				goto end;
217				}
218
219			/* s->version=SSL3_VERSION; */
220			s->type=SSL_ST_CONNECT;
221
222			if (s->init_buf == NULL)
223				{
224				if ((buf=BUF_MEM_new()) == NULL)
225					{
226					ret= -1;
227					goto end;
228					}
229				if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
230					{
231					ret= -1;
232					goto end;
233					}
234				s->init_buf=buf;
235				buf=NULL;
236				}
237
238			if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
239
240			/* setup buffing BIO */
241			if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
242
243			/* don't push the buffering BIO quite yet */
244
245			s->state=SSL3_ST_CW_CLNT_HELLO_A;
246			s->ctx->stats.sess_connect++;
247			s->init_num=0;
248			/* mark client_random uninitialized */
249			memset(s->s3->client_random,0,sizeof(s->s3->client_random));
250			s->d1->send_cookie = 0;
251			s->hit = 0;
252			break;
253
254#ifndef OPENSSL_NO_SCTP
255		case DTLS1_SCTP_ST_CR_READ_SOCK:
256
257			if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
258			{
259				s->s3->in_read_app_data=2;
260				s->rwstate=SSL_READING;
261				BIO_clear_retry_flags(SSL_get_rbio(s));
262				BIO_set_retry_read(SSL_get_rbio(s));
263				ret = -1;
264				goto end;
265			}
266
267			s->state=s->s3->tmp.next_state;
268			break;
269
270		case DTLS1_SCTP_ST_CW_WRITE_SOCK:
271			/* read app data until dry event */
272
273			ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
274			if (ret < 0) goto end;
275
276			if (ret == 0)
277			{
278				s->s3->in_read_app_data=2;
279				s->rwstate=SSL_READING;
280				BIO_clear_retry_flags(SSL_get_rbio(s));
281				BIO_set_retry_read(SSL_get_rbio(s));
282				ret = -1;
283				goto end;
284			}
285
286			s->state=s->d1->next_state;
287			break;
288#endif
289
290		case SSL3_ST_CW_CLNT_HELLO_A:
291		case SSL3_ST_CW_CLNT_HELLO_B:
292
293			s->shutdown=0;
294
295			/* every DTLS ClientHello resets Finished MAC */
296			ssl3_init_finished_mac(s);
297
298			dtls1_start_timer(s);
299			ret=dtls1_client_hello(s);
300			if (ret <= 0) goto end;
301
302			if ( s->d1->send_cookie)
303				{
304				s->state=SSL3_ST_CW_FLUSH;
305				s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
306				}
307			else
308				s->state=SSL3_ST_CR_SRVR_HELLO_A;
309
310			s->init_num=0;
311
312#ifndef OPENSSL_NO_SCTP
313			/* Disable buffering for SCTP */
314			if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
315				{
316#endif
317				/* turn on buffering for the next lot of output */
318				if (s->bbio != s->wbio)
319					s->wbio=BIO_push(s->bbio,s->wbio);
320#ifndef OPENSSL_NO_SCTP
321				}
322#endif
323
324			break;
325
326		case SSL3_ST_CR_SRVR_HELLO_A:
327		case SSL3_ST_CR_SRVR_HELLO_B:
328			ret=ssl3_get_server_hello(s);
329			if (ret <= 0) goto end;
330			else
331				{
332				if (s->hit)
333					{
334#ifndef OPENSSL_NO_SCTP
335					/* Add new shared key for SCTP-Auth,
336					 * will be ignored if no SCTP used.
337					 */
338					snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
339					         DTLS1_SCTP_AUTH_LABEL);
340
341					SSL_export_keying_material(s, sctpauthkey,
342					                           sizeof(sctpauthkey), labelbuffer,
343					                           sizeof(labelbuffer), NULL, 0, 0);
344
345					BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
346							 sizeof(sctpauthkey), sctpauthkey);
347#endif
348
349					s->state=SSL3_ST_CR_FINISHED_A;
350					}
351				else
352					s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
353				}
354			s->init_num=0;
355			break;
356
357		case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
358		case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
359
360			ret = dtls1_get_hello_verify(s);
361			if ( ret <= 0)
362				goto end;
363			dtls1_stop_timer(s);
364			if ( s->d1->send_cookie) /* start again, with a cookie */
365				s->state=SSL3_ST_CW_CLNT_HELLO_A;
366			else
367				s->state = SSL3_ST_CR_CERT_A;
368			s->init_num = 0;
369			break;
370
371		case SSL3_ST_CR_CERT_A:
372		case SSL3_ST_CR_CERT_B:
373#ifndef OPENSSL_NO_TLSEXT
374			ret=ssl3_check_finished(s);
375			if (ret <= 0) goto end;
376			if (ret == 2)
377				{
378				s->hit = 1;
379				if (s->tlsext_ticket_expected)
380					s->state=SSL3_ST_CR_SESSION_TICKET_A;
381				else
382					s->state=SSL3_ST_CR_FINISHED_A;
383				s->init_num=0;
384				break;
385				}
386#endif
387			/* Check if it is anon DH or PSK */
388			if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
389			    !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
390				{
391				ret=ssl3_get_server_certificate(s);
392				if (ret <= 0) goto end;
393#ifndef OPENSSL_NO_TLSEXT
394				if (s->tlsext_status_expected)
395					s->state=SSL3_ST_CR_CERT_STATUS_A;
396				else
397					s->state=SSL3_ST_CR_KEY_EXCH_A;
398				}
399			else
400				{
401				skip = 1;
402				s->state=SSL3_ST_CR_KEY_EXCH_A;
403				}
404#else
405				}
406			else
407				skip=1;
408
409			s->state=SSL3_ST_CR_KEY_EXCH_A;
410#endif
411			s->init_num=0;
412			break;
413
414		case SSL3_ST_CR_KEY_EXCH_A:
415		case SSL3_ST_CR_KEY_EXCH_B:
416			ret=ssl3_get_key_exchange(s);
417			if (ret <= 0) goto end;
418			s->state=SSL3_ST_CR_CERT_REQ_A;
419			s->init_num=0;
420
421			/* at this point we check that we have the
422			 * required stuff from the server */
423			if (!ssl3_check_cert_and_algorithm(s))
424				{
425				ret= -1;
426				goto end;
427				}
428			break;
429
430		case SSL3_ST_CR_CERT_REQ_A:
431		case SSL3_ST_CR_CERT_REQ_B:
432			ret=ssl3_get_certificate_request(s);
433			if (ret <= 0) goto end;
434			s->state=SSL3_ST_CR_SRVR_DONE_A;
435			s->init_num=0;
436			break;
437
438		case SSL3_ST_CR_SRVR_DONE_A:
439		case SSL3_ST_CR_SRVR_DONE_B:
440			ret=ssl3_get_server_done(s);
441			if (ret <= 0) goto end;
442			dtls1_stop_timer(s);
443			if (s->s3->tmp.cert_req)
444				s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
445			else
446				s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
447			s->init_num=0;
448
449#ifndef OPENSSL_NO_SCTP
450			if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
451			    state == SSL_ST_RENEGOTIATE)
452				s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
453			else
454#endif
455			s->state=s->s3->tmp.next_state;
456			break;
457
458		case SSL3_ST_CW_CERT_A:
459		case SSL3_ST_CW_CERT_B:
460		case SSL3_ST_CW_CERT_C:
461		case SSL3_ST_CW_CERT_D:
462			dtls1_start_timer(s);
463			ret=dtls1_send_client_certificate(s);
464			if (ret <= 0) goto end;
465			s->state=SSL3_ST_CW_KEY_EXCH_A;
466			s->init_num=0;
467			break;
468
469		case SSL3_ST_CW_KEY_EXCH_A:
470		case SSL3_ST_CW_KEY_EXCH_B:
471			dtls1_start_timer(s);
472			ret=dtls1_send_client_key_exchange(s);
473			if (ret <= 0) goto end;
474
475#ifndef OPENSSL_NO_SCTP
476			/* Add new shared key for SCTP-Auth,
477			 * will be ignored if no SCTP used.
478			 */
479			snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
480			         DTLS1_SCTP_AUTH_LABEL);
481
482			SSL_export_keying_material(s, sctpauthkey,
483			                           sizeof(sctpauthkey), labelbuffer,
484			                           sizeof(labelbuffer), NULL, 0, 0);
485
486			BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
487					 sizeof(sctpauthkey), sctpauthkey);
488#endif
489
490			/* EAY EAY EAY need to check for DH fix cert
491			 * sent back */
492			/* For TLS, cert_req is set to 2, so a cert chain
493			 * of nothing is sent, but no verify packet is sent */
494			if (s->s3->tmp.cert_req == 1)
495				{
496				s->state=SSL3_ST_CW_CERT_VRFY_A;
497				}
498			else
499				{
500#ifndef OPENSSL_NO_SCTP
501				if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
502					{
503					s->d1->next_state=SSL3_ST_CW_CHANGE_A;
504					s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
505					}
506				else
507#endif
508					s->state=SSL3_ST_CW_CHANGE_A;
509				s->s3->change_cipher_spec=0;
510				}
511
512			s->init_num=0;
513			break;
514
515		case SSL3_ST_CW_CERT_VRFY_A:
516		case SSL3_ST_CW_CERT_VRFY_B:
517			dtls1_start_timer(s);
518			ret=dtls1_send_client_verify(s);
519			if (ret <= 0) goto end;
520#ifndef OPENSSL_NO_SCTP
521			if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
522			{
523				s->d1->next_state=SSL3_ST_CW_CHANGE_A;
524				s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
525			}
526			else
527#endif
528				s->state=SSL3_ST_CW_CHANGE_A;
529			s->init_num=0;
530			s->s3->change_cipher_spec=0;
531			break;
532
533		case SSL3_ST_CW_CHANGE_A:
534		case SSL3_ST_CW_CHANGE_B:
535			if (!s->hit)
536				dtls1_start_timer(s);
537			ret=dtls1_send_change_cipher_spec(s,
538				SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
539			if (ret <= 0) goto end;
540
541#ifndef OPENSSL_NO_SCTP
542			/* Change to new shared key of SCTP-Auth,
543			 * will be ignored if no SCTP used.
544			 */
545			BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
546#endif
547
548			s->state=SSL3_ST_CW_FINISHED_A;
549			s->init_num=0;
550
551			s->session->cipher=s->s3->tmp.new_cipher;
552#ifdef OPENSSL_NO_COMP
553			s->session->compress_meth=0;
554#else
555			if (s->s3->tmp.new_compression == NULL)
556				s->session->compress_meth=0;
557			else
558				s->session->compress_meth=
559					s->s3->tmp.new_compression->id;
560#endif
561			if (!s->method->ssl3_enc->setup_key_block(s))
562				{
563				ret= -1;
564				goto end;
565				}
566
567			if (!s->method->ssl3_enc->change_cipher_state(s,
568				SSL3_CHANGE_CIPHER_CLIENT_WRITE))
569				{
570				ret= -1;
571				goto end;
572				}
573
574			dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
575			break;
576
577		case SSL3_ST_CW_FINISHED_A:
578		case SSL3_ST_CW_FINISHED_B:
579			if (!s->hit)
580				dtls1_start_timer(s);
581			ret=dtls1_send_finished(s,
582				SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
583				s->method->ssl3_enc->client_finished_label,
584				s->method->ssl3_enc->client_finished_label_len);
585			if (ret <= 0) goto end;
586			s->state=SSL3_ST_CW_FLUSH;
587
588			/* clear flags */
589			s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
590			if (s->hit)
591				{
592				s->s3->tmp.next_state=SSL_ST_OK;
593#ifndef OPENSSL_NO_SCTP
594				if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
595					{
596						s->d1->next_state = s->s3->tmp.next_state;
597						s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
598					}
599#endif
600				if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
601					{
602					s->state=SSL_ST_OK;
603#ifndef OPENSSL_NO_SCTP
604					if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
605						{
606							s->d1->next_state = SSL_ST_OK;
607							s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
608						}
609#endif
610					s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
611					s->s3->delay_buf_pop_ret=0;
612					}
613				}
614			else
615				{
616#ifndef OPENSSL_NO_TLSEXT
617				/* Allow NewSessionTicket if ticket expected */
618				if (s->tlsext_ticket_expected)
619					s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
620				else
621#endif
622
623				s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
624				}
625			s->init_num=0;
626			break;
627
628#ifndef OPENSSL_NO_TLSEXT
629		case SSL3_ST_CR_SESSION_TICKET_A:
630		case SSL3_ST_CR_SESSION_TICKET_B:
631			ret=ssl3_get_new_session_ticket(s);
632			if (ret <= 0) goto end;
633			s->state=SSL3_ST_CR_FINISHED_A;
634			s->init_num=0;
635		break;
636
637		case SSL3_ST_CR_CERT_STATUS_A:
638		case SSL3_ST_CR_CERT_STATUS_B:
639			ret=ssl3_get_cert_status(s);
640			if (ret <= 0) goto end;
641			s->state=SSL3_ST_CR_KEY_EXCH_A;
642			s->init_num=0;
643		break;
644#endif
645
646		case SSL3_ST_CR_FINISHED_A:
647		case SSL3_ST_CR_FINISHED_B:
648			s->d1->change_cipher_spec_ok = 1;
649			ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
650				SSL3_ST_CR_FINISHED_B);
651			if (ret <= 0) goto end;
652			dtls1_stop_timer(s);
653
654			if (s->hit)
655				s->state=SSL3_ST_CW_CHANGE_A;
656			else
657				s->state=SSL_ST_OK;
658
659#ifndef OPENSSL_NO_SCTP
660			if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
661				state == SSL_ST_RENEGOTIATE)
662				{
663				s->d1->next_state=s->state;
664				s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
665				}
666#endif
667
668			s->init_num=0;
669			break;
670
671		case SSL3_ST_CW_FLUSH:
672			s->rwstate=SSL_WRITING;
673			if (BIO_flush(s->wbio) <= 0)
674				{
675				/* If the write error was fatal, stop trying */
676				if (!BIO_should_retry(s->wbio))
677					{
678					s->rwstate=SSL_NOTHING;
679					s->state=s->s3->tmp.next_state;
680					}
681
682				ret= -1;
683				goto end;
684				}
685			s->rwstate=SSL_NOTHING;
686			s->state=s->s3->tmp.next_state;
687			break;
688
689		case SSL_ST_OK:
690			/* clean a few things up */
691			ssl3_cleanup_key_block(s);
692
693#if 0
694			if (s->init_buf != NULL)
695				{
696				BUF_MEM_free(s->init_buf);
697				s->init_buf=NULL;
698				}
699#endif
700
701			/* If we are not 'joining' the last two packets,
702			 * remove the buffering now */
703			if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
704				ssl_free_wbio_buffer(s);
705			/* else do it later in ssl3_write */
706
707			s->init_num=0;
708			s->renegotiate=0;
709			s->new_session=0;
710
711			ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
712			if (s->hit) s->ctx->stats.sess_hit++;
713
714			ret=1;
715			/* s->server=0; */
716			s->handshake_func=dtls1_connect;
717			s->ctx->stats.sess_connect_good++;
718
719			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
720
721			/* done with handshaking */
722			s->d1->handshake_read_seq  = 0;
723			s->d1->next_handshake_write_seq = 0;
724			goto end;
725			/* break; */
726
727		default:
728			SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
729			ret= -1;
730			goto end;
731			/* break; */
732			}
733
734		/* did we do anything */
735		if (!s->s3->tmp.reuse_message && !skip)
736			{
737			if (s->debug)
738				{
739				if ((ret=BIO_flush(s->wbio)) <= 0)
740					goto end;
741				}
742
743			if ((cb != NULL) && (s->state != state))
744				{
745				new_state=s->state;
746				s->state=state;
747				cb(s,SSL_CB_CONNECT_LOOP,1);
748				s->state=new_state;
749				}
750			}
751		skip=0;
752		}
753end:
754	s->in_handshake--;
755
756#ifndef OPENSSL_NO_SCTP
757	/* Notify SCTP BIO socket to leave handshake
758	 * mode and allow stream identifier other
759	 * than 0. Will be ignored if no SCTP is used.
760	 */
761	BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
762#endif
763
764	if (buf != NULL)
765		BUF_MEM_free(buf);
766	if (cb != NULL)
767		cb(s,SSL_CB_CONNECT_EXIT,ret);
768	return(ret);
769	}
770
771int dtls1_client_hello(SSL *s)
772	{
773	unsigned char *buf;
774	unsigned char *p,*d;
775	unsigned int i,j;
776	unsigned long Time,l;
777	SSL_COMP *comp;
778
779	buf=(unsigned char *)s->init_buf->data;
780	if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
781		{
782		SSL_SESSION *sess = s->session;
783		if ((s->session == NULL) ||
784			(s->session->ssl_version != s->version) ||
785#ifdef OPENSSL_NO_TLSEXT
786			!sess->session_id_length ||
787#else
788			(!sess->session_id_length && !sess->tlsext_tick) ||
789#endif
790			(s->session->not_resumable))
791			{
792		        if (!s->session_creation_enabled)
793				{
794				ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
795				SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED);
796				goto err;
797				}
798			if (!ssl_get_new_session(s,0))
799				goto err;
800			}
801		/* else use the pre-loaded session */
802
803		p=s->s3->client_random;
804
805		/* if client_random is initialized, reuse it, we are
806		 * required to use same upon reply to HelloVerify */
807		for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
808		if (i==sizeof(s->s3->client_random))
809			{
810			Time=(unsigned long)time(NULL);	/* Time */
811			l2n(Time,p);
812			RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
813			}
814
815		/* Do the message type and length last */
816		d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
817
818		*(p++)=s->version>>8;
819		*(p++)=s->version&0xff;
820		s->client_version=s->version;
821
822		/* Random stuff */
823		memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
824		p+=SSL3_RANDOM_SIZE;
825
826		/* Session ID */
827		if (s->new_session)
828			i=0;
829		else
830			i=s->session->session_id_length;
831		*(p++)=i;
832		if (i != 0)
833			{
834			if (i > sizeof s->session->session_id)
835				{
836				SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
837				goto err;
838				}
839			memcpy(p,s->session->session_id,i);
840			p+=i;
841			}
842
843		/* cookie stuff */
844		if ( s->d1->cookie_len > sizeof(s->d1->cookie))
845			{
846			SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
847			goto err;
848			}
849		*(p++) = s->d1->cookie_len;
850		memcpy(p, s->d1->cookie, s->d1->cookie_len);
851		p += s->d1->cookie_len;
852
853		/* Ciphers supported */
854		i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
855		if (i == 0)
856			{
857			SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
858			goto err;
859			}
860		s2n(i,p);
861		p+=i;
862
863		/* COMPRESSION */
864		if (s->ctx->comp_methods == NULL)
865			j=0;
866		else
867			j=sk_SSL_COMP_num(s->ctx->comp_methods);
868		*(p++)=1+j;
869		for (i=0; i<j; i++)
870			{
871			comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
872			*(p++)=comp->id;
873			}
874		*(p++)=0; /* Add the NULL method */
875
876#ifndef OPENSSL_NO_TLSEXT
877		if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
878			{
879			SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
880			goto err;
881			}
882#endif
883
884		l=(p-d);
885		d=buf;
886
887		d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
888
889		s->state=SSL3_ST_CW_CLNT_HELLO_B;
890		/* number of bytes to write */
891		s->init_num=p-buf;
892		s->init_off=0;
893
894		/* buffer the message to handle re-xmits */
895		dtls1_buffer_message(s, 0);
896		}
897
898	/* SSL3_ST_CW_CLNT_HELLO_B */
899	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
900err:
901	return(-1);
902	}
903
904static int dtls1_get_hello_verify(SSL *s)
905	{
906	int n, al, ok = 0;
907	unsigned char *data;
908	unsigned int cookie_len;
909
910	n=s->method->ssl_get_message(s,
911		DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
912		DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
913		-1,
914		s->max_cert_list,
915		&ok);
916
917	if (!ok) return((int)n);
918
919	if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
920		{
921		s->d1->send_cookie = 0;
922		s->s3->tmp.reuse_message=1;
923		return(1);
924		}
925
926	data = (unsigned char *)s->init_msg;
927
928	if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
929		{
930		SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
931		s->version=(s->version&0xff00)|data[1];
932		al = SSL_AD_PROTOCOL_VERSION;
933		goto f_err;
934		}
935	data+=2;
936
937	cookie_len = *(data++);
938	if ( cookie_len > sizeof(s->d1->cookie))
939		{
940		al=SSL_AD_ILLEGAL_PARAMETER;
941		goto f_err;
942		}
943
944	memcpy(s->d1->cookie, data, cookie_len);
945	s->d1->cookie_len = cookie_len;
946
947	s->d1->send_cookie = 1;
948	return 1;
949
950f_err:
951	ssl3_send_alert(s, SSL3_AL_FATAL, al);
952	return -1;
953	}
954
955int dtls1_send_client_key_exchange(SSL *s)
956	{
957	unsigned char *p,*d;
958	int n;
959	unsigned long alg_k;
960#ifndef OPENSSL_NO_RSA
961	unsigned char *q;
962	EVP_PKEY *pkey=NULL;
963#endif
964#ifndef OPENSSL_NO_KRB5
965        KSSL_ERR kssl_err;
966#endif /* OPENSSL_NO_KRB5 */
967#ifndef OPENSSL_NO_ECDH
968	EC_KEY *clnt_ecdh = NULL;
969	const EC_POINT *srvr_ecpoint = NULL;
970	EVP_PKEY *srvr_pub_pkey = NULL;
971	unsigned char *encodedPoint = NULL;
972	int encoded_pt_len = 0;
973	BN_CTX * bn_ctx = NULL;
974#endif
975
976	if (s->state == SSL3_ST_CW_KEY_EXCH_A)
977		{
978		d=(unsigned char *)s->init_buf->data;
979		p= &(d[DTLS1_HM_HEADER_LENGTH]);
980
981		alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
982
983                /* Fool emacs indentation */
984                if (0) {}
985#ifndef OPENSSL_NO_RSA
986		else if (alg_k & SSL_kRSA)
987			{
988			RSA *rsa;
989			unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
990
991			if (s->session->sess_cert->peer_rsa_tmp != NULL)
992				rsa=s->session->sess_cert->peer_rsa_tmp;
993			else
994				{
995				pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
996				if ((pkey == NULL) ||
997					(pkey->type != EVP_PKEY_RSA) ||
998					(pkey->pkey.rsa == NULL))
999					{
1000					SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1001					goto err;
1002					}
1003				rsa=pkey->pkey.rsa;
1004				EVP_PKEY_free(pkey);
1005				}
1006
1007			tmp_buf[0]=s->client_version>>8;
1008			tmp_buf[1]=s->client_version&0xff;
1009			if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1010					goto err;
1011
1012			s->session->master_key_length=sizeof tmp_buf;
1013
1014			q=p;
1015			/* Fix buf for TLS and [incidentally] DTLS */
1016			if (s->version > SSL3_VERSION)
1017				p+=2;
1018			n=RSA_public_encrypt(sizeof tmp_buf,
1019				tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1020#ifdef PKCS1_CHECK
1021			if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1022			if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1023#endif
1024			if (n <= 0)
1025				{
1026				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1027				goto err;
1028				}
1029
1030			/* Fix buf for TLS and [incidentally] DTLS */
1031			if (s->version > SSL3_VERSION)
1032				{
1033				s2n(n,q);
1034				n+=2;
1035				}
1036
1037			s->session->master_key_length=
1038				s->method->ssl3_enc->generate_master_secret(s,
1039					s->session->master_key,
1040					tmp_buf,sizeof tmp_buf);
1041			OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1042			}
1043#endif
1044#ifndef OPENSSL_NO_KRB5
1045		else if (alg_k & SSL_kKRB5)
1046                        {
1047                        krb5_error_code	krb5rc;
1048                        KSSL_CTX	*kssl_ctx = s->kssl_ctx;
1049                        /*  krb5_data	krb5_ap_req;  */
1050                        krb5_data	*enc_ticket;
1051                        krb5_data	authenticator, *authp = NULL;
1052			EVP_CIPHER_CTX	ciph_ctx;
1053			const EVP_CIPHER *enc = NULL;
1054			unsigned char	iv[EVP_MAX_IV_LENGTH];
1055			unsigned char	tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1056			unsigned char	epms[SSL_MAX_MASTER_KEY_LENGTH
1057						+ EVP_MAX_IV_LENGTH];
1058			int 		padl, outl = sizeof(epms);
1059
1060			EVP_CIPHER_CTX_init(&ciph_ctx);
1061
1062#ifdef KSSL_DEBUG
1063                        printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1064                                alg_k, SSL_kKRB5);
1065#endif	/* KSSL_DEBUG */
1066
1067			authp = NULL;
1068#ifdef KRB5SENDAUTH
1069			if (KRB5SENDAUTH)  authp = &authenticator;
1070#endif	/* KRB5SENDAUTH */
1071
1072                        krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1073				&kssl_err);
1074			enc = kssl_map_enc(kssl_ctx->enctype);
1075                        if (enc == NULL)
1076                            goto err;
1077#ifdef KSSL_DEBUG
1078                        {
1079                        printf("kssl_cget_tkt rtn %d\n", krb5rc);
1080                        if (krb5rc && kssl_err.text)
1081			  printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1082                        }
1083#endif	/* KSSL_DEBUG */
1084
1085                        if (krb5rc)
1086                                {
1087                                ssl3_send_alert(s,SSL3_AL_FATAL,
1088						SSL_AD_HANDSHAKE_FAILURE);
1089                                SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1090						kssl_err.reason);
1091                                goto err;
1092                                }
1093
1094			/*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1095			**  in place of RFC 2712 KerberosWrapper, as in:
1096			**
1097                        **  Send ticket (copy to *p, set n = length)
1098                        **  n = krb5_ap_req.length;
1099                        **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1100                        **  if (krb5_ap_req.data)
1101                        **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1102                        **
1103			**  Now using real RFC 2712 KerberosWrapper
1104			**  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1105			**  Note: 2712 "opaque" types are here replaced
1106			**  with a 2-byte length followed by the value.
1107			**  Example:
1108			**  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1109			**  Where "xx xx" = length bytes.  Shown here with
1110			**  optional authenticator omitted.
1111			*/
1112
1113			/*  KerberosWrapper.Ticket		*/
1114			s2n(enc_ticket->length,p);
1115			memcpy(p, enc_ticket->data, enc_ticket->length);
1116			p+= enc_ticket->length;
1117			n = enc_ticket->length + 2;
1118
1119			/*  KerberosWrapper.Authenticator	*/
1120			if (authp  &&  authp->length)
1121				{
1122				s2n(authp->length,p);
1123				memcpy(p, authp->data, authp->length);
1124				p+= authp->length;
1125				n+= authp->length + 2;
1126
1127				free(authp->data);
1128				authp->data = NULL;
1129				authp->length = 0;
1130				}
1131			else
1132				{
1133				s2n(0,p);/*  null authenticator length	*/
1134				n+=2;
1135				}
1136
1137			if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1138			    goto err;
1139
1140			/*  20010420 VRS.  Tried it this way; failed.
1141			**	EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1142			**	EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1143			**				kssl_ctx->length);
1144			**	EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1145			*/
1146
1147			memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1148			EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1149				kssl_ctx->key,iv);
1150			EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1151				sizeof tmp_buf);
1152			EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1153			outl += padl;
1154			if (outl > (int)sizeof epms)
1155				{
1156				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1157				goto err;
1158				}
1159			EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1160
1161			/*  KerberosWrapper.EncryptedPreMasterSecret	*/
1162			s2n(outl,p);
1163			memcpy(p, epms, outl);
1164			p+=outl;
1165			n+=outl + 2;
1166
1167                        s->session->master_key_length=
1168                                s->method->ssl3_enc->generate_master_secret(s,
1169					s->session->master_key,
1170					tmp_buf, sizeof tmp_buf);
1171
1172			OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1173			OPENSSL_cleanse(epms, outl);
1174                        }
1175#endif
1176#ifndef OPENSSL_NO_DH
1177		else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1178			{
1179			DH *dh_srvr,*dh_clnt;
1180
1181			if (s->session->sess_cert->peer_dh_tmp != NULL)
1182				dh_srvr=s->session->sess_cert->peer_dh_tmp;
1183			else
1184				{
1185				/* we get them from the cert */
1186				ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1187				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1188				goto err;
1189				}
1190
1191			/* generate a new random key */
1192			if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1193				{
1194				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1195				goto err;
1196				}
1197			if (!DH_generate_key(dh_clnt))
1198				{
1199				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1200				goto err;
1201				}
1202
1203			/* use the 'p' output buffer for the DH key, but
1204			 * make sure to clear it out afterwards */
1205
1206			n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1207
1208			if (n <= 0)
1209				{
1210				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1211				goto err;
1212				}
1213
1214			/* generate master key from the result */
1215			s->session->master_key_length=
1216				s->method->ssl3_enc->generate_master_secret(s,
1217					s->session->master_key,p,n);
1218			/* clean up */
1219			memset(p,0,n);
1220
1221			/* send off the data */
1222			n=BN_num_bytes(dh_clnt->pub_key);
1223			s2n(n,p);
1224			BN_bn2bin(dh_clnt->pub_key,p);
1225			n+=2;
1226
1227			DH_free(dh_clnt);
1228
1229			/* perhaps clean things up a bit EAY EAY EAY EAY*/
1230			}
1231#endif
1232#ifndef OPENSSL_NO_ECDH
1233		else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1234			{
1235			const EC_GROUP *srvr_group = NULL;
1236			EC_KEY *tkey;
1237			int ecdh_clnt_cert = 0;
1238			int field_size = 0;
1239
1240			/* Did we send out the client's
1241			 * ECDH share for use in premaster
1242			 * computation as part of client certificate?
1243			 * If so, set ecdh_clnt_cert to 1.
1244			 */
1245			if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1246				{
1247				/* XXX: For now, we do not support client
1248				 * authentication using ECDH certificates.
1249				 * To add such support, one needs to add
1250				 * code that checks for appropriate
1251				 * conditions and sets ecdh_clnt_cert to 1.
1252				 * For example, the cert have an ECC
1253				 * key on the same curve as the server's
1254				 * and the key should be authorized for
1255				 * key agreement.
1256				 *
1257				 * One also needs to add code in ssl3_connect
1258				 * to skip sending the certificate verify
1259				 * message.
1260				 *
1261				 * if ((s->cert->key->privatekey != NULL) &&
1262				 *     (s->cert->key->privatekey->type ==
1263				 *      EVP_PKEY_EC) && ...)
1264				 * ecdh_clnt_cert = 1;
1265				 */
1266				}
1267
1268			if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1269				{
1270				tkey = s->session->sess_cert->peer_ecdh_tmp;
1271				}
1272			else
1273				{
1274				/* Get the Server Public Key from Cert */
1275				srvr_pub_pkey = X509_get_pubkey(s->session-> \
1276				    sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1277				if ((srvr_pub_pkey == NULL) ||
1278				    (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1279				    (srvr_pub_pkey->pkey.ec == NULL))
1280					{
1281					SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1282					    ERR_R_INTERNAL_ERROR);
1283					goto err;
1284					}
1285
1286				tkey = srvr_pub_pkey->pkey.ec;
1287				}
1288
1289			srvr_group   = EC_KEY_get0_group(tkey);
1290			srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1291
1292			if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1293				{
1294				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1295				    ERR_R_INTERNAL_ERROR);
1296				goto err;
1297				}
1298
1299			if ((clnt_ecdh=EC_KEY_new()) == NULL)
1300				{
1301				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1302				goto err;
1303				}
1304
1305			if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1306				{
1307				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1308				goto err;
1309				}
1310			if (ecdh_clnt_cert)
1311				{
1312				/* Reuse key info from our certificate
1313				 * We only need our private key to perform
1314				 * the ECDH computation.
1315				 */
1316				const BIGNUM *priv_key;
1317				tkey = s->cert->key->privatekey->pkey.ec;
1318				priv_key = EC_KEY_get0_private_key(tkey);
1319				if (priv_key == NULL)
1320					{
1321					SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1322					goto err;
1323					}
1324				if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1325					{
1326					SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1327					goto err;
1328					}
1329				}
1330			else
1331				{
1332				/* Generate a new ECDH key pair */
1333				if (!(EC_KEY_generate_key(clnt_ecdh)))
1334					{
1335					SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1336					goto err;
1337					}
1338				}
1339
1340			/* use the 'p' output buffer for the ECDH key, but
1341			 * make sure to clear it out afterwards
1342			 */
1343
1344			field_size = EC_GROUP_get_degree(srvr_group);
1345			if (field_size <= 0)
1346				{
1347				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1348				       ERR_R_ECDH_LIB);
1349				goto err;
1350				}
1351			n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1352			if (n <= 0)
1353				{
1354				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1355				       ERR_R_ECDH_LIB);
1356				goto err;
1357				}
1358
1359			/* generate master key from the result */
1360			s->session->master_key_length = s->method->ssl3_enc \
1361			    -> generate_master_secret(s,
1362				s->session->master_key,
1363				p, n);
1364
1365			memset(p, 0, n); /* clean up */
1366
1367			if (ecdh_clnt_cert)
1368				{
1369				/* Send empty client key exch message */
1370				n = 0;
1371				}
1372			else
1373				{
1374				/* First check the size of encoding and
1375				 * allocate memory accordingly.
1376				 */
1377				encoded_pt_len =
1378				    EC_POINT_point2oct(srvr_group,
1379					EC_KEY_get0_public_key(clnt_ecdh),
1380					POINT_CONVERSION_UNCOMPRESSED,
1381					NULL, 0, NULL);
1382
1383				encodedPoint = (unsigned char *)
1384				    OPENSSL_malloc(encoded_pt_len *
1385					sizeof(unsigned char));
1386				bn_ctx = BN_CTX_new();
1387				if ((encodedPoint == NULL) ||
1388				    (bn_ctx == NULL))
1389					{
1390					SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1391					goto err;
1392					}
1393
1394				/* Encode the public key */
1395				n = EC_POINT_point2oct(srvr_group,
1396				    EC_KEY_get0_public_key(clnt_ecdh),
1397				    POINT_CONVERSION_UNCOMPRESSED,
1398				    encodedPoint, encoded_pt_len, bn_ctx);
1399
1400				*p = n; /* length of encoded point */
1401				/* Encoded point will be copied here */
1402				p += 1;
1403				/* copy the point */
1404				memcpy((unsigned char *)p, encodedPoint, n);
1405				/* increment n to account for length field */
1406				n += 1;
1407				}
1408
1409			/* Free allocated memory */
1410			BN_CTX_free(bn_ctx);
1411			if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1412			if (clnt_ecdh != NULL)
1413				 EC_KEY_free(clnt_ecdh);
1414			EVP_PKEY_free(srvr_pub_pkey);
1415			}
1416#endif /* !OPENSSL_NO_ECDH */
1417
1418#ifndef OPENSSL_NO_PSK
1419		else if (alg_k & SSL_kPSK)
1420			{
1421			char identity[PSK_MAX_IDENTITY_LEN];
1422			unsigned char *t = NULL;
1423			unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1424			unsigned int pre_ms_len = 0, psk_len = 0;
1425			int psk_err = 1;
1426
1427			n = 0;
1428			if (s->psk_client_callback == NULL)
1429				{
1430				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1431					SSL_R_PSK_NO_CLIENT_CB);
1432				goto err;
1433				}
1434
1435			psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1436				identity, PSK_MAX_IDENTITY_LEN,
1437				psk_or_pre_ms, sizeof(psk_or_pre_ms));
1438			if (psk_len > PSK_MAX_PSK_LEN)
1439				{
1440				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1441					ERR_R_INTERNAL_ERROR);
1442				goto psk_err;
1443				}
1444			else if (psk_len == 0)
1445				{
1446				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1447					SSL_R_PSK_IDENTITY_NOT_FOUND);
1448				goto psk_err;
1449				}
1450
1451			/* create PSK pre_master_secret */
1452			pre_ms_len = 2+psk_len+2+psk_len;
1453			t = psk_or_pre_ms;
1454			memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1455			s2n(psk_len, t);
1456			memset(t, 0, psk_len);
1457			t+=psk_len;
1458			s2n(psk_len, t);
1459
1460			if (s->session->psk_identity_hint != NULL)
1461				OPENSSL_free(s->session->psk_identity_hint);
1462			s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1463			if (s->ctx->psk_identity_hint != NULL &&
1464				s->session->psk_identity_hint == NULL)
1465				{
1466				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1467					ERR_R_MALLOC_FAILURE);
1468				goto psk_err;
1469				}
1470
1471			if (s->session->psk_identity != NULL)
1472				OPENSSL_free(s->session->psk_identity);
1473			s->session->psk_identity = BUF_strdup(identity);
1474			if (s->session->psk_identity == NULL)
1475				{
1476				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1477					ERR_R_MALLOC_FAILURE);
1478				goto psk_err;
1479				}
1480
1481			s->session->master_key_length =
1482				s->method->ssl3_enc->generate_master_secret(s,
1483					s->session->master_key,
1484					psk_or_pre_ms, pre_ms_len);
1485			n = strlen(identity);
1486			s2n(n, p);
1487			memcpy(p, identity, n);
1488			n+=2;
1489			psk_err = 0;
1490		psk_err:
1491			OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1492			OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1493			if (psk_err != 0)
1494				{
1495				ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1496				goto err;
1497				}
1498			}
1499#endif
1500		else
1501			{
1502			ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1503			SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1504			goto err;
1505			}
1506
1507		d = dtls1_set_message_header(s, d,
1508		SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1509		/*
1510		 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1511		 l2n3(n,d);
1512		 l2n(s->d1->handshake_write_seq,d);
1513		 s->d1->handshake_write_seq++;
1514		*/
1515
1516		s->state=SSL3_ST_CW_KEY_EXCH_B;
1517		/* number of bytes to write */
1518		s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1519		s->init_off=0;
1520
1521		/* buffer the message to handle re-xmits */
1522		dtls1_buffer_message(s, 0);
1523		}
1524
1525	/* SSL3_ST_CW_KEY_EXCH_B */
1526	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1527err:
1528#ifndef OPENSSL_NO_ECDH
1529	BN_CTX_free(bn_ctx);
1530	if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1531	if (clnt_ecdh != NULL)
1532		EC_KEY_free(clnt_ecdh);
1533	EVP_PKEY_free(srvr_pub_pkey);
1534#endif
1535	return(-1);
1536	}
1537
1538int dtls1_send_client_verify(SSL *s)
1539	{
1540	unsigned char *p,*d;
1541	unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1542	EVP_PKEY *pkey;
1543#ifndef OPENSSL_NO_RSA
1544	unsigned u=0;
1545#endif
1546	unsigned long n;
1547#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1548	int j;
1549#endif
1550
1551	if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1552		{
1553		d=(unsigned char *)s->init_buf->data;
1554		p= &(d[DTLS1_HM_HEADER_LENGTH]);
1555		pkey=s->cert->key->privatekey;
1556
1557		s->method->ssl3_enc->cert_verify_mac(s,
1558		NID_sha1,
1559			&(data[MD5_DIGEST_LENGTH]));
1560
1561#ifndef OPENSSL_NO_RSA
1562		if (pkey->type == EVP_PKEY_RSA)
1563			{
1564			s->method->ssl3_enc->cert_verify_mac(s,
1565				NID_md5,
1566				&(data[0]));
1567			if (RSA_sign(NID_md5_sha1, data,
1568					 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1569					&(p[2]), &u, pkey->pkey.rsa) <= 0 )
1570				{
1571				SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1572				goto err;
1573				}
1574			s2n(u,p);
1575			n=u+2;
1576			}
1577		else
1578#endif
1579#ifndef OPENSSL_NO_DSA
1580			if (pkey->type == EVP_PKEY_DSA)
1581			{
1582			if (!DSA_sign(pkey->save_type,
1583				&(data[MD5_DIGEST_LENGTH]),
1584				SHA_DIGEST_LENGTH,&(p[2]),
1585				(unsigned int *)&j,pkey->pkey.dsa))
1586				{
1587				SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1588				goto err;
1589				}
1590			s2n(j,p);
1591			n=j+2;
1592			}
1593		else
1594#endif
1595#ifndef OPENSSL_NO_ECDSA
1596			if (pkey->type == EVP_PKEY_EC)
1597			{
1598			if (!ECDSA_sign(pkey->save_type,
1599				&(data[MD5_DIGEST_LENGTH]),
1600				SHA_DIGEST_LENGTH,&(p[2]),
1601				(unsigned int *)&j,pkey->pkey.ec))
1602				{
1603				SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1604				    ERR_R_ECDSA_LIB);
1605				goto err;
1606				}
1607			s2n(j,p);
1608			n=j+2;
1609			}
1610		else
1611#endif
1612			{
1613			SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1614			goto err;
1615			}
1616
1617		d = dtls1_set_message_header(s, d,
1618			SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1619
1620		s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1621		s->init_off=0;
1622
1623		/* buffer the message to handle re-xmits */
1624		dtls1_buffer_message(s, 0);
1625
1626		s->state = SSL3_ST_CW_CERT_VRFY_B;
1627		}
1628
1629	/* s->state = SSL3_ST_CW_CERT_VRFY_B */
1630	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1631err:
1632	return(-1);
1633	}
1634
1635int dtls1_send_client_certificate(SSL *s)
1636	{
1637	X509 *x509=NULL;
1638	EVP_PKEY *pkey=NULL;
1639	int i;
1640	unsigned long l;
1641
1642	if (s->state ==	SSL3_ST_CW_CERT_A)
1643		{
1644		if ((s->cert == NULL) ||
1645			(s->cert->key->x509 == NULL) ||
1646			(s->cert->key->privatekey == NULL))
1647			s->state=SSL3_ST_CW_CERT_B;
1648		else
1649			s->state=SSL3_ST_CW_CERT_C;
1650		}
1651
1652	/* We need to get a client cert */
1653	if (s->state == SSL3_ST_CW_CERT_B)
1654		{
1655		/* If we get an error, we need to
1656		 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1657		 * We then get retied later */
1658		i=0;
1659		i = ssl_do_client_cert_cb(s, &x509, &pkey);
1660		if (i < 0)
1661			{
1662			s->rwstate=SSL_X509_LOOKUP;
1663			return(-1);
1664			}
1665		s->rwstate=SSL_NOTHING;
1666		if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1667			{
1668			s->state=SSL3_ST_CW_CERT_B;
1669			if (	!SSL_use_certificate(s,x509) ||
1670				!SSL_use_PrivateKey(s,pkey))
1671				i=0;
1672			}
1673		else if (i == 1)
1674			{
1675			i=0;
1676			SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1677			}
1678
1679		if (x509 != NULL) X509_free(x509);
1680		if (pkey != NULL) EVP_PKEY_free(pkey);
1681		if (i == 0)
1682			{
1683			if (s->version == SSL3_VERSION)
1684				{
1685				s->s3->tmp.cert_req=0;
1686				ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1687				return(1);
1688				}
1689			else
1690				{
1691				s->s3->tmp.cert_req=2;
1692				}
1693			}
1694
1695		/* Ok, we have a cert */
1696		s->state=SSL3_ST_CW_CERT_C;
1697		}
1698
1699	if (s->state == SSL3_ST_CW_CERT_C)
1700		{
1701		s->state=SSL3_ST_CW_CERT_D;
1702		l=dtls1_output_cert_chain(s,
1703			(s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1704		s->init_num=(int)l;
1705		s->init_off=0;
1706
1707		/* set header called by dtls1_output_cert_chain() */
1708
1709		/* buffer the message to handle re-xmits */
1710		dtls1_buffer_message(s, 0);
1711		}
1712	/* SSL3_ST_CW_CERT_D */
1713	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1714	}
1715
1716
1717