mbedtls/programs/ssl/dtls_server.c

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/*
* Simple DTLS server demonstration program
*
* Copyright (C) 2014, Brainspark B.V.
*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if !defined(POLARSSL_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
#include POLARSSL_CONFIG_FILE
#endif
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#if defined(POLARSSL_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
#define polarssl_printf printf
#define polarssl_fprintf fprintf
#endif
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#if !defined(POLARSSL_SSL_SRV_C) || !defined(POLARSSL_SSL_PROTO_DTLS) || \
!defined(POLARSSL_SSL_COOKIE_C) || !defined(POLARSSL_NET_C) || \
!defined(POLARSSL_ENTROPY_C) || !defined(POLARSSL_CTR_DRBG_C) || \
!defined(POLARSSL_X509_CRT_PARSE_C) || !defined(POLARSSL_RSA_C) || \
!defined(POLARSSL_CERTS_C) || !defined(POLARSSL_PEM_PARSE_C)
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#include <stdio.h>
int main( void )
{
printf( "POLARSSL_SSL_SRV_C and/or POLARSSL_SSL_PROTO_DTLS and/or "
"POLARSSL_SSL_COOKIE_C and/or POLARSSL_NET_C and/or "
"POLARSSL_ENTROPY_C and/or POLARSSL_CTR_DRBG_C and/or "
"POLARSSL_X509_CRT_PARSE_C and/or POLARSSL_RSA_C and/or "
"POLARSSL_CERTS_C and/or POLARSSL_PEM_PARSE_C not defined.\n" );
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return( 0 );
}
#else
#if defined(_WIN32)
#include <windows.h>
#endif
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
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#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/certs.h"
#include "mbedtls/x509.h"
#include "mbedtls/ssl.h"
#include "mbedtls/ssl_cookie.h"
#include "mbedtls/net.h"
#include "mbedtls/error.h"
#include "mbedtls/debug.h"
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#if defined(POLARSSL_SSL_CACHE_C)
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#include "mbedtls/ssl_cache.h"
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#endif
#define READ_TIMEOUT_MS 10000 /* 5 seconds */
#define DEBUG_LEVEL 0
static void my_debug( void *ctx, int level, const char *str )
{
((void) level);
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polarssl_fprintf( (FILE *) ctx, "%s", str );
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fflush( (FILE *) ctx );
}
int main( void )
{
int ret, len;
int listen_fd;
int client_fd = -1;
unsigned char buf[1024];
const char *pers = "dtls_server";
unsigned char client_ip[16] = { 0 };
ssl_cookie_ctx cookie_ctx;
entropy_context entropy;
ctr_drbg_context ctr_drbg;
ssl_context ssl;
x509_crt srvcert;
pk_context pkey;
#if defined(POLARSSL_SSL_CACHE_C)
ssl_cache_context cache;
#endif
memset( &ssl, 0, sizeof(ssl_context) );
ssl_cookie_init( &cookie_ctx );
#if defined(POLARSSL_SSL_CACHE_C)
ssl_cache_init( &cache );
#endif
x509_crt_init( &srvcert );
pk_init( &pkey );
entropy_init( &entropy );
#if defined(POLARSSL_DEBUG_C)
debug_set_threshold( DEBUG_LEVEL );
#endif
/*
* 1. Load the certificates and private RSA key
*/
printf( "\n . Loading the server cert. and key..." );
fflush( stdout );
/*
* This demonstration program uses embedded test certificates.
* Instead, you may want to use x509_crt_parse_file() to read the
* server and CA certificates, as well as pk_parse_keyfile().
*/
ret = x509_crt_parse( &srvcert, (const unsigned char *) test_srv_crt,
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test_srv_crt_len );
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if( ret != 0 )
{
printf( " failed\n ! x509_crt_parse returned %d\n\n", ret );
goto exit;
}
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ret = x509_crt_parse( &srvcert, (const unsigned char *) test_cas_pem,
test_cas_pem_len );
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if( ret != 0 )
{
printf( " failed\n ! x509_crt_parse returned %d\n\n", ret );
goto exit;
}
ret = pk_parse_key( &pkey, (const unsigned char *) test_srv_key,
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test_srv_key_len, NULL, 0 );
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if( ret != 0 )
{
printf( " failed\n ! pk_parse_key returned %d\n\n", ret );
goto exit;
}
printf( " ok\n" );
/*
* 2. Setup the "listening" UDP socket
*/
printf( " . Bind on udp/*/4433 ..." );
fflush( stdout );
if( ( ret = net_bind( &listen_fd, NULL, 4433, NET_PROTO_UDP ) ) != 0 )
{
printf( " failed\n ! net_bind returned %d\n\n", ret );
goto exit;
}
printf( " ok\n" );
/*
* 3. Seed the RNG
*/
printf( " . Seeding the random number generator..." );
fflush( stdout );
if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
printf( " failed\n ! ctr_drbg_init returned %d\n", ret );
goto exit;
}
printf( " ok\n" );
/*
* 4. Setup stuff
*/
printf( " . Setting up the DTLS data..." );
fflush( stdout );
if( ( ret = ssl_init( &ssl ) ) != 0 )
{
printf( " failed\n ! ssl_init returned %d\n\n", ret );
goto exit;
}
ssl_set_endpoint( &ssl, SSL_IS_SERVER );
ssl_set_transport( &ssl, SSL_TRANSPORT_DATAGRAM );
ssl_set_authmode( &ssl, SSL_VERIFY_NONE );
ssl_set_rng( &ssl, ctr_drbg_random, &ctr_drbg );
ssl_set_dbg( &ssl, my_debug, stdout );
#if defined(POLARSSL_SSL_CACHE_C)
ssl_set_session_cache( &ssl, ssl_cache_get, &cache,
ssl_cache_set, &cache );
#endif
ssl_set_ca_chain( &ssl, srvcert.next, NULL, NULL );
if( ( ret = ssl_set_own_cert( &ssl, &srvcert, &pkey ) ) != 0 )
{
printf( " failed\n ! ssl_set_own_cert returned %d\n\n", ret );
goto exit;
}
if( ( ret = ssl_cookie_setup( &cookie_ctx,
ctr_drbg_random, &ctr_drbg ) ) != 0 )
{
printf( " failed\n ! ssl_cookie_setup returned %d\n\n", ret );
goto exit;
}
ssl_set_dtls_cookies( &ssl, ssl_cookie_write, ssl_cookie_check,
&cookie_ctx );
printf( " ok\n" );
reset:
#ifdef POLARSSL_ERROR_C
if( ret != 0 )
{
char error_buf[100];
polarssl_strerror( ret, error_buf, 100 );
printf("Last error was: %d - %s\n\n", ret, error_buf );
}
#endif
if( client_fd != -1 )
net_close( client_fd );
ssl_session_reset( &ssl );
/*
* 3. Wait until a client connects
*/
client_fd = -1;
printf( " . Waiting for a remote connection ..." );
fflush( stdout );
if( ( ret = net_accept( listen_fd, &client_fd, client_ip ) ) != 0 )
{
printf( " failed\n ! net_accept returned %d\n\n", ret );
goto exit;
}
/* With UDP, bind_fd is hijacked by client_fd, so bind a new one */
if( ( ret = net_bind( &listen_fd, NULL, 4433, NET_PROTO_UDP ) ) != 0 )
{
printf( " failed\n ! net_bind returned -0x%x\n\n", -ret );
goto exit;
}
/* For HelloVerifyRequest cookies */
if( ( ret = ssl_set_client_transport_id( &ssl, client_ip,
sizeof( client_ip ) ) ) != 0 )
{
printf( " failed\n ! "
"ssl_set_client_tranport_id() returned -0x%x\n\n", -ret );
goto exit;
}
ssl_set_bio_timeout( &ssl, &client_fd,
net_send, net_recv, net_recv_timeout,
READ_TIMEOUT_MS );
printf( " ok\n" );
/*
* 5. Handshake
*/
printf( " . Performing the DTLS handshake..." );
fflush( stdout );
do ret = ssl_handshake( &ssl );
while( ret == POLARSSL_ERR_NET_WANT_READ ||
ret == POLARSSL_ERR_NET_WANT_WRITE );
if( ret == POLARSSL_ERR_SSL_HELLO_VERIFY_REQUIRED )
{
printf( " hello verification requested\n" );
ret = 0;
goto reset;
}
else if( ret != 0 )
{
printf( " failed\n ! ssl_handshake returned -0x%x\n\n", -ret );
goto reset;
}
printf( " ok\n" );
/*
* 6. Read the echo Request
*/
printf( " < Read from client:" );
fflush( stdout );
len = sizeof( buf ) - 1;
memset( buf, 0, sizeof( buf ) );
do ret = ssl_read( &ssl, buf, len );
while( ret == POLARSSL_ERR_NET_WANT_READ ||
ret == POLARSSL_ERR_NET_WANT_WRITE );
if( ret <= 0 )
{
switch( ret )
{
case POLARSSL_ERR_NET_TIMEOUT:
printf( " timeout\n\n" );
goto reset;
case POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY:
printf( " connection was closed gracefully\n" );
ret = 0;
goto close_notify;
default:
printf( " ssl_read returned -0x%x\n\n", -ret );
goto reset;
}
}
len = ret;
printf( " %d bytes read\n\n%s\n\n", len, buf );
/*
* 7. Write the 200 Response
*/
printf( " > Write to client:" );
fflush( stdout );
do ret = ssl_write( &ssl, buf, len );
while( ret == POLARSSL_ERR_NET_WANT_READ ||
ret == POLARSSL_ERR_NET_WANT_WRITE );
if( ret < 0 )
{
printf( " failed\n ! ssl_write returned %d\n\n", ret );
goto exit;
}
len = ret;
printf( " %d bytes written\n\n%s\n\n", len, buf );
/*
* 8. Done, cleanly close the connection
*/
close_notify:
printf( " . Closing the connection..." );
/* No error checking, the connection might be closed already */
do ret = ssl_close_notify( &ssl );
while( ret == POLARSSL_ERR_NET_WANT_WRITE );
ret = 0;
printf( " done\n" );
goto reset;
/*
* Final clean-ups and exit
*/
exit:
#ifdef POLARSSL_ERROR_C
if( ret != 0 )
{
char error_buf[100];
polarssl_strerror( ret, error_buf, 100 );
printf( "Last error was: %d - %s\n\n", ret, error_buf );
}
#endif
if( client_fd != -1 )
net_close( client_fd );
x509_crt_free( &srvcert );
pk_free( &pkey );
ssl_free( &ssl );
ssl_cookie_free( &cookie_ctx );
#if defined(POLARSSL_SSL_CACHE_C)
ssl_cache_free( &cache );
#endif
ctr_drbg_free( &ctr_drbg );
entropy_free( &entropy );
#if defined(_WIN32)
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 /* POLARSSL_SSL_SRV_C && POLARSSL_SSL_PROTO_DTLS &&
POLARSSL_SSL_COOKIE_C && POLARSSL_NET_C && POLARSSL_ENTROPY_C &&
POLARSSL_CTR_DRBG_C && POLARSSL_X509_CRT_PARSE_C && POLARSSL_RSA_C
&& POLARSSL_CERTS_C && POLARSSL_PEM_PARSE_C */