351 lines
10 KiB
C
351 lines
10 KiB
C
/*
|
|
* Simple DTLS client demonstration program
|
|
*
|
|
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
* not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* This file is part of mbed TLS (https://tls.mbed.org)
|
|
*/
|
|
|
|
#if !defined(MBEDTLS_CONFIG_FILE)
|
|
#include "mbedtls/config.h"
|
|
#else
|
|
#include MBEDTLS_CONFIG_FILE
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_PLATFORM_C)
|
|
#include "mbedtls/platform.h"
|
|
#else
|
|
#include <stdio.h>
|
|
#define mbedtls_printf printf
|
|
#define mbedtls_fprintf fprintf
|
|
#endif
|
|
|
|
#if !defined(MBEDTLS_SSL_CLI_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) || \
|
|
!defined(MBEDTLS_NET_C) || !defined(MBEDTLS_TIMING_C) || \
|
|
!defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
|
|
!defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_RSA_C) || \
|
|
!defined(MBEDTLS_CERTS_C)
|
|
int main( void )
|
|
{
|
|
mbedtls_printf( "MBEDTLS_SSL_CLI_C and/or MBEDTLS_SSL_PROTO_DTLS and/or "
|
|
"MBEDTLS_NET_C and/or MBEDTLS_TIMING_C and/or "
|
|
"MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
|
|
"MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_RSA_C and/or "
|
|
"MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C not defined.\n" );
|
|
return( 0 );
|
|
}
|
|
#else
|
|
|
|
#include <string.h>
|
|
|
|
#include "mbedtls/net.h"
|
|
#include "mbedtls/debug.h"
|
|
#include "mbedtls/ssl.h"
|
|
#include "mbedtls/entropy.h"
|
|
#include "mbedtls/ctr_drbg.h"
|
|
#include "mbedtls/error.h"
|
|
#include "mbedtls/certs.h"
|
|
#include "mbedtls/timing.h"
|
|
|
|
#define SERVER_PORT "4433"
|
|
#define SERVER_NAME "localhost"
|
|
#define SERVER_ADDR "127.0.0.1" /* forces IPv4 */
|
|
#define MESSAGE "Echo this"
|
|
|
|
#define READ_TIMEOUT_MS 1000
|
|
#define MAX_RETRY 5
|
|
|
|
#define DEBUG_LEVEL 0
|
|
|
|
static void my_debug( void *ctx, int level,
|
|
const char *file, int line,
|
|
const char *str )
|
|
{
|
|
((void) level);
|
|
|
|
mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
|
|
fflush( (FILE *) ctx );
|
|
}
|
|
|
|
int main( int argc, char *argv[] )
|
|
{
|
|
int ret, len;
|
|
mbedtls_net_context server_fd;
|
|
uint32_t flags;
|
|
unsigned char buf[1024];
|
|
const char *pers = "dtls_client";
|
|
int retry_left = MAX_RETRY;
|
|
|
|
mbedtls_entropy_context entropy;
|
|
mbedtls_ctr_drbg_context ctr_drbg;
|
|
mbedtls_ssl_context ssl;
|
|
mbedtls_ssl_config conf;
|
|
mbedtls_x509_crt cacert;
|
|
mbedtls_timing_delay_context timer;
|
|
|
|
((void) argc);
|
|
((void) argv);
|
|
|
|
#if defined(MBEDTLS_DEBUG_C)
|
|
mbedtls_debug_set_threshold( DEBUG_LEVEL );
|
|
#endif
|
|
|
|
/*
|
|
* 0. Initialize the RNG and the session data
|
|
*/
|
|
mbedtls_net_init( &server_fd );
|
|
mbedtls_ssl_init( &ssl );
|
|
mbedtls_ssl_config_init( &conf );
|
|
mbedtls_x509_crt_init( &cacert );
|
|
mbedtls_ctr_drbg_init( &ctr_drbg );
|
|
|
|
mbedtls_printf( "\n . Seeding the random number generator..." );
|
|
fflush( stdout );
|
|
|
|
mbedtls_entropy_init( &entropy );
|
|
if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
|
|
(const unsigned char *) pers,
|
|
strlen( pers ) ) ) != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_printf( " ok\n" );
|
|
|
|
/*
|
|
* 0. Load certificates
|
|
*/
|
|
mbedtls_printf( " . Loading the CA root certificate ..." );
|
|
fflush( stdout );
|
|
|
|
ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem,
|
|
mbedtls_test_cas_pem_len );
|
|
if( ret < 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned -0x%x\n\n", -ret );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_printf( " ok (%d skipped)\n", ret );
|
|
|
|
/*
|
|
* 1. Start the connection
|
|
*/
|
|
mbedtls_printf( " . Connecting to udp/%s/%s...", SERVER_NAME, SERVER_PORT );
|
|
fflush( stdout );
|
|
|
|
if( ( ret = mbedtls_net_connect( &server_fd, SERVER_ADDR,
|
|
SERVER_PORT, MBEDTLS_NET_PROTO_UDP ) ) != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_printf( " ok\n" );
|
|
|
|
/*
|
|
* 2. Setup stuff
|
|
*/
|
|
mbedtls_printf( " . Setting up the DTLS structure..." );
|
|
fflush( stdout );
|
|
|
|
if( ( ret = mbedtls_ssl_config_defaults( &conf,
|
|
MBEDTLS_SSL_IS_CLIENT,
|
|
MBEDTLS_SSL_TRANSPORT_DATAGRAM,
|
|
MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
/* OPTIONAL is usually a bad choice for security, but makes interop easier
|
|
* in this simplified example, in which the ca chain is hardcoded.
|
|
* Production code should set a proper ca chain and use REQUIRED. */
|
|
mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
|
|
mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
|
|
mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
|
|
mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
|
|
|
|
if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
if( ( ret = mbedtls_ssl_set_hostname( &ssl, SERVER_NAME ) ) != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_ssl_set_bio( &ssl, &server_fd,
|
|
mbedtls_net_send, mbedtls_net_recv, mbedtls_net_recv_timeout );
|
|
|
|
mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
|
|
mbedtls_timing_get_delay );
|
|
|
|
mbedtls_printf( " ok\n" );
|
|
|
|
/*
|
|
* 4. Handshake
|
|
*/
|
|
mbedtls_printf( " . Performing the SSL/TLS handshake..." );
|
|
fflush( stdout );
|
|
|
|
do ret = mbedtls_ssl_handshake( &ssl );
|
|
while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
|
|
ret == MBEDTLS_ERR_SSL_WANT_WRITE );
|
|
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned -0x%x\n\n", -ret );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_printf( " ok\n" );
|
|
|
|
/*
|
|
* 5. Verify the server certificate
|
|
*/
|
|
mbedtls_printf( " . Verifying peer X.509 certificate..." );
|
|
|
|
/* In real life, we would have used MBEDTLS_SSL_VERIFY_REQUIRED so that the
|
|
* handshake would not succeed if the peer's cert is bad. Even if we used
|
|
* MBEDTLS_SSL_VERIFY_OPTIONAL, we would bail out here if ret != 0 */
|
|
if( ( flags = mbedtls_ssl_get_verify_result( &ssl ) ) != 0 )
|
|
{
|
|
char vrfy_buf[512];
|
|
|
|
mbedtls_printf( " failed\n" );
|
|
|
|
mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
|
|
|
|
mbedtls_printf( "%s\n", vrfy_buf );
|
|
}
|
|
else
|
|
mbedtls_printf( " ok\n" );
|
|
|
|
/*
|
|
* 6. Write the echo request
|
|
*/
|
|
send_request:
|
|
mbedtls_printf( " > Write to server:" );
|
|
fflush( stdout );
|
|
|
|
len = sizeof( MESSAGE ) - 1;
|
|
|
|
do ret = mbedtls_ssl_write( &ssl, (unsigned char *) MESSAGE, len );
|
|
while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
|
|
ret == MBEDTLS_ERR_SSL_WANT_WRITE );
|
|
|
|
if( ret < 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
len = ret;
|
|
mbedtls_printf( " %d bytes written\n\n%s\n\n", len, MESSAGE );
|
|
|
|
/*
|
|
* 7. Read the echo response
|
|
*/
|
|
mbedtls_printf( " < Read from server:" );
|
|
fflush( stdout );
|
|
|
|
len = sizeof( buf ) - 1;
|
|
memset( buf, 0, sizeof( buf ) );
|
|
|
|
do ret = mbedtls_ssl_read( &ssl, buf, len );
|
|
while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
|
|
ret == MBEDTLS_ERR_SSL_WANT_WRITE );
|
|
|
|
if( ret <= 0 )
|
|
{
|
|
switch( ret )
|
|
{
|
|
case MBEDTLS_ERR_SSL_TIMEOUT:
|
|
mbedtls_printf( " timeout\n\n" );
|
|
if( retry_left-- > 0 )
|
|
goto send_request;
|
|
goto exit;
|
|
|
|
case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
|
|
mbedtls_printf( " connection was closed gracefully\n" );
|
|
ret = 0;
|
|
goto close_notify;
|
|
|
|
default:
|
|
mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n\n", -ret );
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
len = ret;
|
|
mbedtls_printf( " %d bytes read\n\n%s\n\n", len, buf );
|
|
|
|
/*
|
|
* 8. Done, cleanly close the connection
|
|
*/
|
|
close_notify:
|
|
mbedtls_printf( " . Closing the connection..." );
|
|
|
|
/* No error checking, the connection might be closed already */
|
|
do ret = mbedtls_ssl_close_notify( &ssl );
|
|
while( ret == MBEDTLS_ERR_SSL_WANT_WRITE );
|
|
ret = 0;
|
|
|
|
mbedtls_printf( " done\n" );
|
|
|
|
/*
|
|
* 9. Final clean-ups and exit
|
|
*/
|
|
exit:
|
|
|
|
#ifdef MBEDTLS_ERROR_C
|
|
if( ret != 0 )
|
|
{
|
|
char error_buf[100];
|
|
mbedtls_strerror( ret, error_buf, 100 );
|
|
mbedtls_printf( "Last error was: %d - %s\n\n", ret, error_buf );
|
|
}
|
|
#endif
|
|
|
|
mbedtls_net_free( &server_fd );
|
|
|
|
mbedtls_x509_crt_free( &cacert );
|
|
mbedtls_ssl_free( &ssl );
|
|
mbedtls_ssl_config_free( &conf );
|
|
mbedtls_ctr_drbg_free( &ctr_drbg );
|
|
mbedtls_entropy_free( &entropy );
|
|
|
|
#if defined(_WIN32)
|
|
mbedtls_printf( " + Press Enter to exit this program.\n" );
|
|
fflush( stdout ); getchar();
|
|
#endif
|
|
|
|
/* Shell can not handle large exit numbers -> 1 for errors */
|
|
if( ret < 0 )
|
|
ret = 1;
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_PROTO_DTLS && MBEDTLS_NET_C &&
|
|
MBEDTLD_TIMING_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C &&
|
|
MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_RSA_C && MBEDTLS_CERTS_C &&
|
|
MBEDTLS_PEM_PARSE_C */
|