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openssl/ssl/d1_clnt.c
Matt Caswell be8b8603d6 Fix DTLS session ticket renewal 
A DTLS client will abort a handshake if the server attempts to renew the
session ticket. This is caused by a state machine discrepancy between DTLS
and TLS discovered during the state machine rewrite work.

The bug can be demonstrated as follows:

Start a DTLS s_server instance:
openssl s_server -dtls

Start a client and obtain a session but no ticket:
openssl s_client -dtls -sess_out session.pem -no_ticket

Now start a client reusing the session, but allow a ticket:
openssl s_client -dtls -sess_in session.pem

The client will abort the handshake.

Reviewed-by: Tim Hudson <tjh@openssl.org>
(cherry picked from commit ee4ffd6fcc)

Conflicts:
	ssl/d1_clnt.c
2015-08-26 10:27:35 +01:00

1714 lines
58 KiB
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/* ssl/d1_clnt.c */
/*
* DTLS implementation written by Nagendra Modadugu
* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
*/
/* ====================================================================
* Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include "ssl_locl.h"
#ifndef OPENSSL_NO_KRB5
# include "kssl_lcl.h"
#endif
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/md5.h>
#include <openssl/bn.h>
#ifndef OPENSSL_NO_DH
# include <openssl/dh.h>
#endif
static const SSL_METHOD *dtls1_get_client_method(int ver);
static int dtls1_get_hello_verify(SSL *s);
static const SSL_METHOD *dtls1_get_client_method(int ver)
{
if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
return (DTLSv1_client_method());
else
return (NULL);
}
IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
ssl_undefined_function,
dtls1_connect, dtls1_get_client_method)
int dtls1_connect(SSL *s)
{
BUF_MEM *buf = NULL;
unsigned long Time = (unsigned long)time(NULL);
void (*cb) (const SSL *ssl, int type, int val) = NULL;
int ret = -1;
int new_state, state, skip = 0;
#ifndef OPENSSL_NO_SCTP
unsigned char sctpauthkey[64];
char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
#endif
RAND_add(&Time, sizeof(Time), 0);
ERR_clear_error();
clear_sys_error();
if (s->info_callback != NULL)
cb = s->info_callback;
else if (s->ctx->info_callback != NULL)
cb = s->ctx->info_callback;
s->in_handshake++;
if (!SSL_in_init(s) || SSL_in_before(s))
SSL_clear(s);
#ifndef OPENSSL_NO_SCTP
/*
* Notify SCTP BIO socket to enter handshake mode and prevent stream
* identifier other than 0. Will be ignored if no SCTP is used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
s->in_handshake, NULL);
#endif
#ifndef OPENSSL_NO_HEARTBEATS
/*
* If we're awaiting a HeartbeatResponse, pretend we already got and
* don't await it anymore, because Heartbeats don't make sense during
* handshakes anyway.
*/
if (s->tlsext_hb_pending) {
dtls1_stop_timer(s);
s->tlsext_hb_pending = 0;
s->tlsext_hb_seq++;
}
#endif
for (;;) {
state = s->state;
switch (s->state) {
case SSL_ST_RENEGOTIATE:
s->renegotiate = 1;
s->state = SSL_ST_CONNECT;
s->ctx->stats.sess_connect_renegotiate++;
/* break */
case SSL_ST_BEFORE:
case SSL_ST_CONNECT:
case SSL_ST_BEFORE | SSL_ST_CONNECT:
case SSL_ST_OK | SSL_ST_CONNECT:
s->server = 0;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_START, 1);
if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
(s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
/* s->version=SSL3_VERSION; */
s->type = SSL_ST_CONNECT;
if (s->init_buf == NULL) {
if ((buf = BUF_MEM_new()) == NULL) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
s->init_buf = buf;
buf = NULL;
}
if (!ssl3_setup_buffers(s)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
/* setup buffing BIO */
if (!ssl_init_wbio_buffer(s, 0)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
/* don't push the buffering BIO quite yet */
s->state = SSL3_ST_CW_CLNT_HELLO_A;
s->ctx->stats.sess_connect++;
s->init_num = 0;
/* mark client_random uninitialized */
memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
s->d1->send_cookie = 0;
s->hit = 0;
s->d1->change_cipher_spec_ok = 0;
/*
* Should have been reset by ssl3_get_finished, too.
*/
s->s3->change_cipher_spec = 0;
break;
#ifndef OPENSSL_NO_SCTP
case DTLS1_SCTP_ST_CR_READ_SOCK:
if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
s->s3->in_read_app_data = 2;
s->rwstate = SSL_READING;
BIO_clear_retry_flags(SSL_get_rbio(s));
BIO_set_retry_read(SSL_get_rbio(s));
ret = -1;
goto end;
}
s->state = s->s3->tmp.next_state;
break;
case DTLS1_SCTP_ST_CW_WRITE_SOCK:
/* read app data until dry event */
ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
if (ret < 0)
goto end;
if (ret == 0) {
s->s3->in_read_app_data = 2;
s->rwstate = SSL_READING;
BIO_clear_retry_flags(SSL_get_rbio(s));
BIO_set_retry_read(SSL_get_rbio(s));
ret = -1;
goto end;
}
s->state = s->d1->next_state;
break;
#endif
case SSL3_ST_CW_CLNT_HELLO_A:
case SSL3_ST_CW_CLNT_HELLO_B:
s->shutdown = 0;
/* every DTLS ClientHello resets Finished MAC */
ssl3_init_finished_mac(s);
dtls1_start_timer(s);
ret = dtls1_client_hello(s);
if (ret <= 0)
goto end;
if (s->d1->send_cookie) {
s->state = SSL3_ST_CW_FLUSH;
s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
} else
s->state = SSL3_ST_CR_SRVR_HELLO_A;
s->init_num = 0;
#ifndef OPENSSL_NO_SCTP
/* Disable buffering for SCTP */
if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
#endif
/*
* turn on buffering for the next lot of output
*/
if (s->bbio != s->wbio)
s->wbio = BIO_push(s->bbio, s->wbio);
#ifndef OPENSSL_NO_SCTP
}
#endif
break;
case SSL3_ST_CR_SRVR_HELLO_A:
case SSL3_ST_CR_SRVR_HELLO_B:
ret = ssl3_get_server_hello(s);
if (ret <= 0)
goto end;
else {
if (s->hit) {
#ifndef OPENSSL_NO_SCTP
/*
* Add new shared key for SCTP-Auth, will be ignored if
* no SCTP used.
*/
snprintf((char *)labelbuffer,
sizeof(DTLS1_SCTP_AUTH_LABEL),
DTLS1_SCTP_AUTH_LABEL);
if (SSL_export_keying_material(s, sctpauthkey,
sizeof(sctpauthkey),
labelbuffer,
sizeof(labelbuffer), NULL, 0,
0) <= 0) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
BIO_ctrl(SSL_get_wbio(s),
BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
sizeof(sctpauthkey), sctpauthkey);
#endif
s->state = SSL3_ST_CR_FINISHED_A;
if (s->tlsext_ticket_expected) {
/* receive renewed session ticket */
s->state = SSL3_ST_CR_SESSION_TICKET_A;
}
} else
s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
}
s->init_num = 0;
break;
case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
ret = dtls1_get_hello_verify(s);
if (ret <= 0)
goto end;
dtls1_stop_timer(s);
if (s->d1->send_cookie) /* start again, with a cookie */
s->state = SSL3_ST_CW_CLNT_HELLO_A;
else
s->state = SSL3_ST_CR_CERT_A;
s->init_num = 0;
break;
case SSL3_ST_CR_CERT_A:
case SSL3_ST_CR_CERT_B:
/* Check if it is anon DH or PSK */
if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
!(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
ret = ssl3_get_server_certificate(s);
if (ret <= 0)
goto end;
#ifndef OPENSSL_NO_TLSEXT
if (s->tlsext_status_expected)
s->state = SSL3_ST_CR_CERT_STATUS_A;
else
s->state = SSL3_ST_CR_KEY_EXCH_A;
} else {
skip = 1;
s->state = SSL3_ST_CR_KEY_EXCH_A;
}
#else
} else
skip = 1;
s->state = SSL3_ST_CR_KEY_EXCH_A;
#endif
s->init_num = 0;
break;
case SSL3_ST_CR_KEY_EXCH_A:
case SSL3_ST_CR_KEY_EXCH_B:
ret = ssl3_get_key_exchange(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_CR_CERT_REQ_A;
s->init_num = 0;
/*
* at this point we check that we have the required stuff from
* the server
*/
if (!ssl3_check_cert_and_algorithm(s)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
break;
case SSL3_ST_CR_CERT_REQ_A:
case SSL3_ST_CR_CERT_REQ_B:
ret = ssl3_get_certificate_request(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_CR_SRVR_DONE_A;
s->init_num = 0;
break;
case SSL3_ST_CR_SRVR_DONE_A:
case SSL3_ST_CR_SRVR_DONE_B:
ret = ssl3_get_server_done(s);
if (ret <= 0)
goto end;
dtls1_stop_timer(s);
if (s->s3->tmp.cert_req)
s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
else
s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
s->init_num = 0;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
state == SSL_ST_RENEGOTIATE)
s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
else
#endif
s->state = s->s3->tmp.next_state;
break;
case SSL3_ST_CW_CERT_A:
case SSL3_ST_CW_CERT_B:
case SSL3_ST_CW_CERT_C:
case SSL3_ST_CW_CERT_D:
dtls1_start_timer(s);
ret = dtls1_send_client_certificate(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_CW_KEY_EXCH_A;
s->init_num = 0;
break;
case SSL3_ST_CW_KEY_EXCH_A:
case SSL3_ST_CW_KEY_EXCH_B:
dtls1_start_timer(s);
ret = dtls1_send_client_key_exchange(s);
if (ret <= 0)
goto end;
#ifndef OPENSSL_NO_SCTP
/*
* Add new shared key for SCTP-Auth, will be ignored if no SCTP
* used.
*/
snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
DTLS1_SCTP_AUTH_LABEL);
if (SSL_export_keying_material(s, sctpauthkey,
sizeof(sctpauthkey), labelbuffer,
sizeof(labelbuffer), NULL, 0, 0) <= 0) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
sizeof(sctpauthkey), sctpauthkey);
#endif
/*
* EAY EAY EAY need to check for DH fix cert sent back
*/
/*
* For TLS, cert_req is set to 2, so a cert chain of nothing is
* sent, but no verify packet is sent
*/
if (s->s3->tmp.cert_req == 1) {
s->state = SSL3_ST_CW_CERT_VRFY_A;
} else {
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = SSL3_ST_CW_CHANGE_A;
s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
} else
#endif
s->state = SSL3_ST_CW_CHANGE_A;
}
s->init_num = 0;
break;
case SSL3_ST_CW_CERT_VRFY_A:
case SSL3_ST_CW_CERT_VRFY_B:
dtls1_start_timer(s);
ret = dtls1_send_client_verify(s);
if (ret <= 0)
goto end;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = SSL3_ST_CW_CHANGE_A;
s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
} else
#endif
s->state = SSL3_ST_CW_CHANGE_A;
s->init_num = 0;
break;
case SSL3_ST_CW_CHANGE_A:
case SSL3_ST_CW_CHANGE_B:
if (!s->hit)
dtls1_start_timer(s);
ret = dtls1_send_change_cipher_spec(s,
SSL3_ST_CW_CHANGE_A,
SSL3_ST_CW_CHANGE_B);
if (ret <= 0)
goto end;
s->state = SSL3_ST_CW_FINISHED_A;
s->init_num = 0;
s->session->cipher = s->s3->tmp.new_cipher;
#ifdef OPENSSL_NO_COMP
s->session->compress_meth = 0;
#else
if (s->s3->tmp.new_compression == NULL)
s->session->compress_meth = 0;
else
s->session->compress_meth = s->s3->tmp.new_compression->id;
#endif
if (!s->method->ssl3_enc->setup_key_block(s)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
if (!s->method->ssl3_enc->change_cipher_state(s,
SSL3_CHANGE_CIPHER_CLIENT_WRITE))
{
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
#ifndef OPENSSL_NO_SCTP
if (s->hit) {
/*
* Change to new shared key of SCTP-Auth, will be ignored if
* no SCTP used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
0, NULL);
}
#endif
dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
break;
case SSL3_ST_CW_FINISHED_A:
case SSL3_ST_CW_FINISHED_B:
if (!s->hit)
dtls1_start_timer(s);
ret = dtls1_send_finished(s,
SSL3_ST_CW_FINISHED_A,
SSL3_ST_CW_FINISHED_B,
s->method->
ssl3_enc->client_finished_label,
s->method->
ssl3_enc->client_finished_label_len);
if (ret <= 0)
goto end;
s->state = SSL3_ST_CW_FLUSH;
/* clear flags */
s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
if (s->hit) {
s->s3->tmp.next_state = SSL_ST_OK;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = s->s3->tmp.next_state;
s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
}
#endif
if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
s->state = SSL_ST_OK;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = SSL_ST_OK;
s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
}
#endif
s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
s->s3->delay_buf_pop_ret = 0;
}
} else {
#ifndef OPENSSL_NO_SCTP
/*
* Change to new shared key of SCTP-Auth, will be ignored if
* no SCTP used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
0, NULL);
#endif
#ifndef OPENSSL_NO_TLSEXT
/*
* Allow NewSessionTicket if ticket expected
*/
if (s->tlsext_ticket_expected)
s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
else
#endif
s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
}
s->init_num = 0;
break;
#ifndef OPENSSL_NO_TLSEXT
case SSL3_ST_CR_SESSION_TICKET_A:
case SSL3_ST_CR_SESSION_TICKET_B:
ret = ssl3_get_new_session_ticket(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_CR_FINISHED_A;
s->init_num = 0;
break;
case SSL3_ST_CR_CERT_STATUS_A:
case SSL3_ST_CR_CERT_STATUS_B:
ret = ssl3_get_cert_status(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_CR_KEY_EXCH_A;
s->init_num = 0;
break;
#endif
case SSL3_ST_CR_FINISHED_A:
case SSL3_ST_CR_FINISHED_B:
s->d1->change_cipher_spec_ok = 1;
ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
SSL3_ST_CR_FINISHED_B);
if (ret <= 0)
goto end;
dtls1_stop_timer(s);
if (s->hit)
s->state = SSL3_ST_CW_CHANGE_A;
else
s->state = SSL_ST_OK;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
state == SSL_ST_RENEGOTIATE) {
s->d1->next_state = s->state;
s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
}
#endif
s->init_num = 0;
break;
case SSL3_ST_CW_FLUSH:
s->rwstate = SSL_WRITING;
if (BIO_flush(s->wbio) <= 0) {
/*
* If the write error was fatal, stop trying
*/
if (!BIO_should_retry(s->wbio)) {
s->rwstate = SSL_NOTHING;
s->state = s->s3->tmp.next_state;
}
ret = -1;
goto end;
}
s->rwstate = SSL_NOTHING;
s->state = s->s3->tmp.next_state;
break;
case SSL_ST_OK:
/* clean a few things up */
ssl3_cleanup_key_block(s);
#if 0
if (s->init_buf != NULL) {
BUF_MEM_free(s->init_buf);
s->init_buf = NULL;
}
#endif
/*
* If we are not 'joining' the last two packets, remove the
* buffering now
*/
if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
ssl_free_wbio_buffer(s);
/* else do it later in ssl3_write */
s->init_num = 0;
s->renegotiate = 0;
s->new_session = 0;
ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
if (s->hit)
s->ctx->stats.sess_hit++;
ret = 1;
/* s->server=0; */
s->handshake_func = dtls1_connect;
s->ctx->stats.sess_connect_good++;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_DONE, 1);
/* done with handshaking */
s->d1->handshake_read_seq = 0;
s->d1->next_handshake_write_seq = 0;
goto end;
/* break; */
case SSL_ST_ERR:
default:
SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
ret = -1;
goto end;
/* break; */
}
/* did we do anything */
if (!s->s3->tmp.reuse_message && !skip) {
if (s->debug) {
if ((ret = BIO_flush(s->wbio)) <= 0)
goto end;
}
if ((cb != NULL) && (s->state != state)) {
new_state = s->state;
s->state = state;
cb(s, SSL_CB_CONNECT_LOOP, 1);
s->state = new_state;
}
}
skip = 0;
}
end:
s->in_handshake--;
#ifndef OPENSSL_NO_SCTP
/*
* Notify SCTP BIO socket to leave handshake mode and allow stream
* identifier other than 0. Will be ignored if no SCTP is used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
s->in_handshake, NULL);
#endif
if (buf != NULL)
BUF_MEM_free(buf);
if (cb != NULL)
cb(s, SSL_CB_CONNECT_EXIT, ret);
return (ret);
}
int dtls1_client_hello(SSL *s)
{
unsigned char *buf;
unsigned char *p, *d;
unsigned int i, j;
unsigned long l;
SSL_COMP *comp;
buf = (unsigned char *)s->init_buf->data;
if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
SSL_SESSION *sess = s->session;
if ((s->session == NULL) || (s->session->ssl_version != s->version) ||
#ifdef OPENSSL_NO_TLSEXT
!sess->session_id_length ||
#else
(!sess->session_id_length && !sess->tlsext_tick) ||
#endif
(s->session->not_resumable)) {
if (!ssl_get_new_session(s, 0))
goto err;
}
/* else use the pre-loaded session */
p = s->s3->client_random;
/*
* if client_random is initialized, reuse it, we are required to use
* same upon reply to HelloVerify
*/
for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ;
if (i == sizeof(s->s3->client_random))
ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random));
/* Do the message type and length last */
d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
*(p++) = s->version >> 8;
*(p++) = s->version & 0xff;
s->client_version = s->version;
/* Random stuff */
memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
p += SSL3_RANDOM_SIZE;
/* Session ID */
if (s->new_session)
i = 0;
else
i = s->session->session_id_length;
*(p++) = i;
if (i != 0) {
if (i > sizeof s->session->session_id) {
SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
goto err;
}
memcpy(p, s->session->session_id, i);
p += i;
}
/* cookie stuff */
if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
goto err;
}
*(p++) = s->d1->cookie_len;
memcpy(p, s->d1->cookie, s->d1->cookie_len);
p += s->d1->cookie_len;
/* Ciphers supported */
i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
if (i == 0) {
SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
goto err;
}
s2n(i, p);
p += i;
/* COMPRESSION */
if (s->ctx->comp_methods == NULL)
j = 0;
else
j = sk_SSL_COMP_num(s->ctx->comp_methods);
*(p++) = 1 + j;
for (i = 0; i < j; i++) {
comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
*(p++) = comp->id;
}
*(p++) = 0; /* Add the NULL method */
#ifndef OPENSSL_NO_TLSEXT
/* TLS extensions */
if (ssl_prepare_clienthello_tlsext(s) <= 0) {
SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
goto err;
}
if ((p =
ssl_add_clienthello_tlsext(s, p,
buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
NULL) {
SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
goto err;
}
#endif
l = (p - d);
d = buf;
d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
s->state = SSL3_ST_CW_CLNT_HELLO_B;
/* number of bytes to write */
s->init_num = p - buf;
s->init_off = 0;
/* buffer the message to handle re-xmits */
dtls1_buffer_message(s, 0);
}
/* SSL3_ST_CW_CLNT_HELLO_B */
return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
err:
return (-1);
}
static int dtls1_get_hello_verify(SSL *s)
{
int n, al, ok = 0;
unsigned char *data;
unsigned int cookie_len;
n = s->method->ssl_get_message(s,
DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
-1, s->max_cert_list, &ok);
if (!ok)
return ((int)n);
if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
s->d1->send_cookie = 0;
s->s3->tmp.reuse_message = 1;
return (1);
}
data = (unsigned char *)s->init_msg;
if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) {
SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
s->version = (s->version & 0xff00) | data[1];
al = SSL_AD_PROTOCOL_VERSION;
goto f_err;
}
data += 2;
cookie_len = *(data++);
if (cookie_len > sizeof(s->d1->cookie)) {
al = SSL_AD_ILLEGAL_PARAMETER;
goto f_err;
}
memcpy(s->d1->cookie, data, cookie_len);
s->d1->cookie_len = cookie_len;
s->d1->send_cookie = 1;
return 1;
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
s->state = SSL_ST_ERR;
return -1;
}
int dtls1_send_client_key_exchange(SSL *s)
{
unsigned char *p, *d;
int n;
unsigned long alg_k;
#ifndef OPENSSL_NO_RSA
unsigned char *q;
EVP_PKEY *pkey = NULL;
#endif
#ifndef OPENSSL_NO_KRB5
KSSL_ERR kssl_err;
#endif /* OPENSSL_NO_KRB5 */
#ifndef OPENSSL_NO_ECDH
EC_KEY *clnt_ecdh = NULL;
const EC_POINT *srvr_ecpoint = NULL;
EVP_PKEY *srvr_pub_pkey = NULL;
unsigned char *encodedPoint = NULL;
int encoded_pt_len = 0;
BN_CTX *bn_ctx = NULL;
#endif
if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
d = (unsigned char *)s->init_buf->data;
p = &(d[DTLS1_HM_HEADER_LENGTH]);
alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
/* Fool emacs indentation */
if (0) {
}
#ifndef OPENSSL_NO_RSA
else if (alg_k & SSL_kRSA) {
RSA *rsa;
unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
if (s->session->sess_cert == NULL) {
/*
* We should always have a server certificate with SSL_kRSA.
*/
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_INTERNAL_ERROR);
goto err;
}
if (s->session->sess_cert->peer_rsa_tmp != NULL)
rsa = s->session->sess_cert->peer_rsa_tmp;
else {
pkey =
X509_get_pubkey(s->session->
sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
x509);
if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
|| (pkey->pkey.rsa == NULL)) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_INTERNAL_ERROR);
goto err;
}
rsa = pkey->pkey.rsa;
EVP_PKEY_free(pkey);
}
tmp_buf[0] = s->client_version >> 8;
tmp_buf[1] = s->client_version & 0xff;
if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
goto err;
s->session->master_key_length = sizeof tmp_buf;
q = p;
/* Fix buf for TLS and [incidentally] DTLS */
if (s->version > SSL3_VERSION)
p += 2;
n = RSA_public_encrypt(sizeof tmp_buf,
tmp_buf, p, rsa, RSA_PKCS1_PADDING);
# ifdef PKCS1_CHECK
if (s->options & SSL_OP_PKCS1_CHECK_1)
p[1]++;
if (s->options & SSL_OP_PKCS1_CHECK_2)
tmp_buf[0] = 0x70;
# endif
if (n <= 0) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
SSL_R_BAD_RSA_ENCRYPT);
goto err;
}
/* Fix buf for TLS and [incidentally] DTLS */
if (s->version > SSL3_VERSION) {
s2n(n, q);
n += 2;
}
s->session->master_key_length =
s->method->ssl3_enc->generate_master_secret(s,
s->
session->master_key,
tmp_buf,
sizeof tmp_buf);
OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
}
#endif
#ifndef OPENSSL_NO_KRB5
else if (alg_k & SSL_kKRB5) {
krb5_error_code krb5rc;
KSSL_CTX *kssl_ctx = s->kssl_ctx;
/* krb5_data krb5_ap_req; */
krb5_data *enc_ticket;
krb5_data authenticator, *authp = NULL;
EVP_CIPHER_CTX ciph_ctx;
const EVP_CIPHER *enc = NULL;
unsigned char iv[EVP_MAX_IV_LENGTH];
unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH];
int padl, outl = sizeof(epms);
EVP_CIPHER_CTX_init(&ciph_ctx);
# ifdef KSSL_DEBUG
printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
alg_k, SSL_kKRB5);
# endif /* KSSL_DEBUG */
authp = NULL;
# ifdef KRB5SENDAUTH
if (KRB5SENDAUTH)
authp = &authenticator;
# endif /* KRB5SENDAUTH */
krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err);
enc = kssl_map_enc(kssl_ctx->enctype);
if (enc == NULL)
goto err;
# ifdef KSSL_DEBUG
{
printf("kssl_cget_tkt rtn %d\n", krb5rc);
if (krb5rc && kssl_err.text)
printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
}
# endif /* KSSL_DEBUG */
if (krb5rc) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
goto err;
}
/*-
* 20010406 VRS - Earlier versions used KRB5 AP_REQ
** in place of RFC 2712 KerberosWrapper, as in:
**
** Send ticket (copy to *p, set n = length)
** n = krb5_ap_req.length;
** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
** if (krb5_ap_req.data)
** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
**
** Now using real RFC 2712 KerberosWrapper
** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
** Note: 2712 "opaque" types are here replaced
** with a 2-byte length followed by the value.
** Example:
** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
** Where "xx xx" = length bytes. Shown here with
** optional authenticator omitted.
*/
/* KerberosWrapper.Ticket */
s2n(enc_ticket->length, p);
memcpy(p, enc_ticket->data, enc_ticket->length);
p += enc_ticket->length;
n = enc_ticket->length + 2;
/* KerberosWrapper.Authenticator */
if (authp && authp->length) {
s2n(authp->length, p);
memcpy(p, authp->data, authp->length);
p += authp->length;
n += authp->length + 2;
free(authp->data);
authp->data = NULL;
authp->length = 0;
} else {
s2n(0, p); /* null authenticator length */
n += 2;
}
if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0)
goto err;
/*-
* 20010420 VRS. Tried it this way; failed.
* EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
* EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
* kssl_ctx->length);
* EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
*/
memset(iv, 0, sizeof iv); /* per RFC 1510 */
EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf,
sizeof tmp_buf);
EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
outl += padl;
if (outl > (int)sizeof epms) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_INTERNAL_ERROR);
goto err;
}
EVP_CIPHER_CTX_cleanup(&ciph_ctx);
/* KerberosWrapper.EncryptedPreMasterSecret */
s2n(outl, p);
memcpy(p, epms, outl);
p += outl;
n += outl + 2;
s->session->master_key_length =
s->method->ssl3_enc->generate_master_secret(s,
s->
session->master_key,
tmp_buf,
sizeof tmp_buf);
OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
OPENSSL_cleanse(epms, outl);
}
#endif
#ifndef OPENSSL_NO_DH
else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
DH *dh_srvr, *dh_clnt;
if (s->session->sess_cert == NULL) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
SSL_R_UNEXPECTED_MESSAGE);
goto err;
}
if (s->session->sess_cert->peer_dh_tmp != NULL)
dh_srvr = s->session->sess_cert->peer_dh_tmp;
else {
/* we get them from the cert */
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
goto err;
}
/* generate a new random key */
if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
goto err;
}
if (!DH_generate_key(dh_clnt)) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
goto err;
}
/*
* use the 'p' output buffer for the DH key, but make sure to
* clear it out afterwards
*/
n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt);
if (n <= 0) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
goto err;
}
/* generate master key from the result */
s->session->master_key_length =
s->method->ssl3_enc->generate_master_secret(s,
s->
session->master_key,
p, n);
/* clean up */
memset(p, 0, n);
/* send off the data */
n = BN_num_bytes(dh_clnt->pub_key);
s2n(n, p);
BN_bn2bin(dh_clnt->pub_key, p);
n += 2;
DH_free(dh_clnt);
/* perhaps clean things up a bit EAY EAY EAY EAY */
}
#endif
#ifndef OPENSSL_NO_ECDH
else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) {
const EC_GROUP *srvr_group = NULL;
EC_KEY *tkey;
int ecdh_clnt_cert = 0;
int field_size = 0;
if (s->session->sess_cert == NULL) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
SSL_R_UNEXPECTED_MESSAGE);
goto err;
}
/*
* Did we send out the client's ECDH share for use in premaster
* computation as part of client certificate? If so, set
* ecdh_clnt_cert to 1.
*/
if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) {
/*
* XXX: For now, we do not support client authentication
* using ECDH certificates. To add such support, one needs to
* add code that checks for appropriate conditions and sets
* ecdh_clnt_cert to 1. For example, the cert have an ECC key
* on the same curve as the server's and the key should be
* authorized for key agreement. One also needs to add code
* in ssl3_connect to skip sending the certificate verify
* message. if ((s->cert->key->privatekey != NULL) &&
* (s->cert->key->privatekey->type == EVP_PKEY_EC) && ...)
* ecdh_clnt_cert = 1;
*/
}
if (s->session->sess_cert->peer_ecdh_tmp != NULL) {
tkey = s->session->sess_cert->peer_ecdh_tmp;
} else {
/* Get the Server Public Key from Cert */
srvr_pub_pkey =
X509_get_pubkey(s->session->
sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
if ((srvr_pub_pkey == NULL)
|| (srvr_pub_pkey->type != EVP_PKEY_EC)
|| (srvr_pub_pkey->pkey.ec == NULL)) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_INTERNAL_ERROR);
goto err;
}
tkey = srvr_pub_pkey->pkey.ec;
}
srvr_group = EC_KEY_get0_group(tkey);
srvr_ecpoint = EC_KEY_get0_public_key(tkey);
if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_INTERNAL_ERROR);
goto err;
}
if ((clnt_ecdh = EC_KEY_new()) == NULL) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
goto err;
}
if (ecdh_clnt_cert) {
/*
* Reuse key info from our certificate We only need our
* private key to perform the ECDH computation.
*/
const BIGNUM *priv_key;
tkey = s->cert->key->privatekey->pkey.ec;
priv_key = EC_KEY_get0_private_key(tkey);
if (priv_key == NULL) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_EC_LIB);
goto err;
}
} else {
/* Generate a new ECDH key pair */
if (!(EC_KEY_generate_key(clnt_ecdh))) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_ECDH_LIB);
goto err;
}
}
/*
* use the 'p' output buffer for the ECDH key, but make sure to
* clear it out afterwards
*/
field_size = EC_GROUP_get_degree(srvr_group);
if (field_size <= 0) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
goto err;
}
n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint,
clnt_ecdh, NULL);
if (n <= 0) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
goto err;
}
/* generate master key from the result */
s->session->master_key_length =
s->method->ssl3_enc->generate_master_secret(s,
s->
session->master_key,
p, n);
memset(p, 0, n); /* clean up */
if (ecdh_clnt_cert) {
/* Send empty client key exch message */
n = 0;
} else {
/*
* First check the size of encoding and allocate memory
* accordingly.
*/
encoded_pt_len =
EC_POINT_point2oct(srvr_group,
EC_KEY_get0_public_key(clnt_ecdh),
POINT_CONVERSION_UNCOMPRESSED,
NULL, 0, NULL);
encodedPoint = (unsigned char *)
OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char));
bn_ctx = BN_CTX_new();
if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_MALLOC_FAILURE);
goto err;
}
/* Encode the public key */
n = EC_POINT_point2oct(srvr_group,
EC_KEY_get0_public_key(clnt_ecdh),
POINT_CONVERSION_UNCOMPRESSED,
encodedPoint, encoded_pt_len, bn_ctx);
*p = n; /* length of encoded point */
/* Encoded point will be copied here */
p += 1;
/* copy the point */
memcpy((unsigned char *)p, encodedPoint, n);
/* increment n to account for length field */
n += 1;
}
/* Free allocated memory */
BN_CTX_free(bn_ctx);
if (encodedPoint != NULL)
OPENSSL_free(encodedPoint);
if (clnt_ecdh != NULL)
EC_KEY_free(clnt_ecdh);
EVP_PKEY_free(srvr_pub_pkey);
}
#endif /* !OPENSSL_NO_ECDH */
#ifndef OPENSSL_NO_PSK
else if (alg_k & SSL_kPSK) {
char identity[PSK_MAX_IDENTITY_LEN];
unsigned char *t = NULL;
unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4];
unsigned int pre_ms_len = 0, psk_len = 0;
int psk_err = 1;
n = 0;
if (s->psk_client_callback == NULL) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
SSL_R_PSK_NO_CLIENT_CB);
goto err;
}
psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
identity, PSK_MAX_IDENTITY_LEN,
psk_or_pre_ms,
sizeof(psk_or_pre_ms));
if (psk_len > PSK_MAX_PSK_LEN) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_INTERNAL_ERROR);
goto psk_err;
} else if (psk_len == 0) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
SSL_R_PSK_IDENTITY_NOT_FOUND);
goto psk_err;
}
/* create PSK pre_master_secret */
pre_ms_len = 2 + psk_len + 2 + psk_len;
t = psk_or_pre_ms;
memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len);
s2n(psk_len, t);
memset(t, 0, psk_len);
t += psk_len;
s2n(psk_len, t);
if (s->session->psk_identity_hint != NULL)
OPENSSL_free(s->session->psk_identity_hint);
s->session->psk_identity_hint =
BUF_strdup(s->ctx->psk_identity_hint);
if (s->ctx->psk_identity_hint != NULL
&& s->session->psk_identity_hint == NULL) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_MALLOC_FAILURE);
goto psk_err;
}
if (s->session->psk_identity != NULL)
OPENSSL_free(s->session->psk_identity);
s->session->psk_identity = BUF_strdup(identity);
if (s->session->psk_identity == NULL) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_MALLOC_FAILURE);
goto psk_err;
}
s->session->master_key_length =
s->method->ssl3_enc->generate_master_secret(s,
s->
session->master_key,
psk_or_pre_ms,
pre_ms_len);
n = strlen(identity);
s2n(n, p);
memcpy(p, identity, n);
n += 2;
psk_err = 0;
psk_err:
OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
if (psk_err != 0) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
goto err;
}
}
#endif
else {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_INTERNAL_ERROR);
goto err;
}
d = dtls1_set_message_header(s, d,
SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
/*-
*(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
l2n3(n,d);
l2n(s->d1->handshake_write_seq,d);
s->d1->handshake_write_seq++;
*/
s->state = SSL3_ST_CW_KEY_EXCH_B;
/* number of bytes to write */
s->init_num = n + DTLS1_HM_HEADER_LENGTH;
s->init_off = 0;
/* buffer the message to handle re-xmits */
dtls1_buffer_message(s, 0);
}
/* SSL3_ST_CW_KEY_EXCH_B */
return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
err:
#ifndef OPENSSL_NO_ECDH
BN_CTX_free(bn_ctx);
if (encodedPoint != NULL)
OPENSSL_free(encodedPoint);
if (clnt_ecdh != NULL)
EC_KEY_free(clnt_ecdh);
EVP_PKEY_free(srvr_pub_pkey);
#endif
return (-1);
}
int dtls1_send_client_verify(SSL *s)
{
unsigned char *p, *d;
unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
EVP_PKEY *pkey;
#ifndef OPENSSL_NO_RSA
unsigned u = 0;
#endif
unsigned long n;
#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
int j;
#endif
if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
d = (unsigned char *)s->init_buf->data;
p = &(d[DTLS1_HM_HEADER_LENGTH]);
pkey = s->cert->key->privatekey;
s->method->ssl3_enc->cert_verify_mac(s,
NID_sha1,
&(data[MD5_DIGEST_LENGTH]));
#ifndef OPENSSL_NO_RSA
if (pkey->type == EVP_PKEY_RSA) {
s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0]));
if (RSA_sign(NID_md5_sha1, data,
MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
&(p[2]), &u, pkey->pkey.rsa) <= 0) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
goto err;
}
s2n(u, p);
n = u + 2;
} else
#endif
#ifndef OPENSSL_NO_DSA
if (pkey->type == EVP_PKEY_DSA) {
if (!DSA_sign(pkey->save_type,
&(data[MD5_DIGEST_LENGTH]),
SHA_DIGEST_LENGTH, &(p[2]),
(unsigned int *)&j, pkey->pkey.dsa)) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
goto err;
}
s2n(j, p);
n = j + 2;
} else
#endif
#ifndef OPENSSL_NO_ECDSA
if (pkey->type == EVP_PKEY_EC) {
if (!ECDSA_sign(pkey->save_type,
&(data[MD5_DIGEST_LENGTH]),
SHA_DIGEST_LENGTH, &(p[2]),
(unsigned int *)&j, pkey->pkey.ec)) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
goto err;
}
s2n(j, p);
n = j + 2;
} else
#endif
{
SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
goto err;
}
d = dtls1_set_message_header(s, d,
SSL3_MT_CERTIFICATE_VERIFY, n, 0, n);
s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH;
s->init_off = 0;
/* buffer the message to handle re-xmits */
dtls1_buffer_message(s, 0);
s->state = SSL3_ST_CW_CERT_VRFY_B;
}
/* s->state = SSL3_ST_CW_CERT_VRFY_B */
return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
err:
return (-1);
}
int dtls1_send_client_certificate(SSL *s)
{
X509 *x509 = NULL;
EVP_PKEY *pkey = NULL;
int i;
unsigned long l;
if (s->state == SSL3_ST_CW_CERT_A) {
if ((s->cert == NULL) ||
(s->cert->key->x509 == NULL) ||
(s->cert->key->privatekey == NULL))
s->state = SSL3_ST_CW_CERT_B;
else
s->state = SSL3_ST_CW_CERT_C;
}
/* We need to get a client cert */
if (s->state == SSL3_ST_CW_CERT_B) {
/*
* If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
* return(-1); We then get retied later
*/
i = 0;
i = ssl_do_client_cert_cb(s, &x509, &pkey);
if (i < 0) {
s->rwstate = SSL_X509_LOOKUP;
return (-1);
}
s->rwstate = SSL_NOTHING;
if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
s->state = SSL3_ST_CW_CERT_B;
if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
i = 0;
} else if (i == 1) {
i = 0;
SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,
SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
}
if (x509 != NULL)
X509_free(x509);
if (pkey != NULL)
EVP_PKEY_free(pkey);
if (i == 0) {
if (s->version == SSL3_VERSION) {
s->s3->tmp.cert_req = 0;
ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
return (1);
} else {
s->s3->tmp.cert_req = 2;
}
}
/* Ok, we have a cert */
s->state = SSL3_ST_CW_CERT_C;
}
if (s->state == SSL3_ST_CW_CERT_C) {
s->state = SSL3_ST_CW_CERT_D;
l = dtls1_output_cert_chain(s,
(s->s3->tmp.cert_req ==
2) ? NULL : s->cert->key->x509);
if (!l) {
SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
return 0;
}
s->init_num = (int)l;
s->init_off = 0;
/* set header called by dtls1_output_cert_chain() */
/* buffer the message to handle re-xmits */
dtls1_buffer_message(s, 0);
}
/* SSL3_ST_CW_CERT_D */
return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
}
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