439 lines
12 KiB
C
439 lines
12 KiB
C
/*
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* Simple DTLS server demonstration program
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#define mbedtls_printf printf
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#define mbedtls_fprintf fprintf
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#define mbedtls_time_t time_t
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#define mbedtls_exit exit
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#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
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#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
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#endif
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/* Uncomment out the following line to default to IPv4 and disable IPv6 */
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//#define FORCE_IPV4
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#ifdef FORCE_IPV4
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#define BIND_IP "0.0.0.0" /* Forces IPv4 */
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#else
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#define BIND_IP "::"
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#endif
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#if !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) || \
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!defined(MBEDTLS_SSL_COOKIE_C) || !defined(MBEDTLS_NET_C) || \
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!defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
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!defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_RSA_C) || \
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!defined(MBEDTLS_CERTS_C) || !defined(MBEDTLS_PEM_PARSE_C) || \
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!defined(MBEDTLS_TIMING_C)
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int main( void )
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{
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printf( "MBEDTLS_SSL_SRV_C and/or MBEDTLS_SSL_PROTO_DTLS and/or "
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"MBEDTLS_SSL_COOKIE_C and/or MBEDTLS_NET_C and/or "
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"MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
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"MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_RSA_C and/or "
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"MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C and/or "
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"MBEDTLS_TIMING_C not defined.\n" );
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mbedtls_exit( 0 );
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}
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#else
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#if defined(_WIN32)
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#include <windows.h>
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#endif
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/certs.h"
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#include "mbedtls/x509.h"
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#include "mbedtls/ssl.h"
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#include "mbedtls/ssl_cookie.h"
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#include "mbedtls/net_sockets.h"
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#include "mbedtls/error.h"
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#include "mbedtls/debug.h"
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#include "mbedtls/timing.h"
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#if defined(MBEDTLS_SSL_CACHE_C)
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#include "mbedtls/ssl_cache.h"
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#endif
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#define READ_TIMEOUT_MS 10000 /* 10 seconds */
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#define DEBUG_LEVEL 0
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static void my_debug( void *ctx, int level,
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const char *file, int line,
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const char *str )
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{
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((void) level);
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mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
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fflush( (FILE *) ctx );
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}
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int main( void )
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{
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int ret, len;
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mbedtls_net_context listen_fd, client_fd;
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unsigned char buf[1024];
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const char *pers = "dtls_server";
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unsigned char client_ip[16] = { 0 };
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size_t cliip_len;
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mbedtls_ssl_cookie_ctx cookie_ctx;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_ssl_context ssl;
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mbedtls_ssl_config conf;
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mbedtls_x509_crt srvcert;
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mbedtls_pk_context pkey;
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mbedtls_timing_delay_context timer;
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#if defined(MBEDTLS_SSL_CACHE_C)
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mbedtls_ssl_cache_context cache;
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#endif
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mbedtls_net_init( &listen_fd );
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mbedtls_net_init( &client_fd );
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mbedtls_ssl_init( &ssl );
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mbedtls_ssl_config_init( &conf );
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mbedtls_ssl_cookie_init( &cookie_ctx );
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#if defined(MBEDTLS_SSL_CACHE_C)
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mbedtls_ssl_cache_init( &cache );
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#endif
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mbedtls_x509_crt_init( &srvcert );
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mbedtls_pk_init( &pkey );
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mbedtls_entropy_init( &entropy );
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mbedtls_ctr_drbg_init( &ctr_drbg );
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#if defined(MBEDTLS_DEBUG_C)
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mbedtls_debug_set_threshold( DEBUG_LEVEL );
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#endif
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/*
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* 1. Load the certificates and private RSA key
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*/
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printf( "\n . Loading the server cert. and key..." );
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fflush( stdout );
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/*
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* This demonstration program uses embedded test certificates.
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* Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
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* server and CA certificates, as well as mbedtls_pk_parse_keyfile().
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*/
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ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
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mbedtls_test_srv_crt_len );
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if( ret != 0 )
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{
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printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
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goto exit;
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}
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ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
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mbedtls_test_cas_pem_len );
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if( ret != 0 )
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{
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printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
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goto exit;
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}
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ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
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mbedtls_test_srv_key_len, NULL, 0 );
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if( ret != 0 )
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{
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printf( " failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret );
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goto exit;
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}
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printf( " ok\n" );
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/*
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* 2. Setup the "listening" UDP socket
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*/
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printf( " . Bind on udp/*/4433 ..." );
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fflush( stdout );
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if( ( ret = mbedtls_net_bind( &listen_fd, BIND_IP, "4433", MBEDTLS_NET_PROTO_UDP ) ) != 0 )
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{
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printf( " failed\n ! mbedtls_net_bind returned %d\n\n", ret );
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goto exit;
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}
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printf( " ok\n" );
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/*
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* 3. Seed the RNG
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*/
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printf( " . Seeding the random number generator..." );
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fflush( stdout );
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if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
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(const unsigned char *) pers,
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strlen( pers ) ) ) != 0 )
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{
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printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
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goto exit;
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}
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printf( " ok\n" );
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/*
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* 4. Setup stuff
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*/
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printf( " . Setting up the DTLS data..." );
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fflush( stdout );
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if( ( ret = mbedtls_ssl_config_defaults( &conf,
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MBEDTLS_SSL_IS_SERVER,
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MBEDTLS_SSL_TRANSPORT_DATAGRAM,
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MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
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mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
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mbedtls_ssl_conf_read_timeout( &conf, READ_TIMEOUT_MS );
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#if defined(MBEDTLS_SSL_CACHE_C)
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mbedtls_ssl_conf_session_cache( &conf, &cache,
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mbedtls_ssl_cache_get,
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mbedtls_ssl_cache_set );
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#endif
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mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
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if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
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{
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printf( " failed\n ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
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goto exit;
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}
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if( ( ret = mbedtls_ssl_cookie_setup( &cookie_ctx,
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mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
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{
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printf( " failed\n ! mbedtls_ssl_cookie_setup returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_ssl_conf_dtls_cookies( &conf, mbedtls_ssl_cookie_write, mbedtls_ssl_cookie_check,
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&cookie_ctx );
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if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
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{
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printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
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mbedtls_timing_get_delay );
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printf( " ok\n" );
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reset:
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#ifdef MBEDTLS_ERROR_C
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if( ret != 0 )
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{
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char error_buf[100];
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mbedtls_strerror( ret, error_buf, 100 );
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printf("Last error was: %d - %s\n\n", ret, error_buf );
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}
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#endif
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mbedtls_net_free( &client_fd );
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mbedtls_ssl_session_reset( &ssl );
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/*
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* 3. Wait until a client connects
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*/
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printf( " . Waiting for a remote connection ..." );
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fflush( stdout );
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if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
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client_ip, sizeof( client_ip ), &cliip_len ) ) != 0 )
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{
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printf( " failed\n ! mbedtls_net_accept returned %d\n\n", ret );
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goto exit;
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}
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/* For HelloVerifyRequest cookies */
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if( ( ret = mbedtls_ssl_set_client_transport_id( &ssl,
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client_ip, cliip_len ) ) != 0 )
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{
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printf( " failed\n ! "
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"mbedtls_ssl_set_client_transport_id() returned -0x%x\n\n", (unsigned int) -ret );
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goto exit;
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}
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mbedtls_ssl_set_bio( &ssl, &client_fd,
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mbedtls_net_send, mbedtls_net_recv, mbedtls_net_recv_timeout );
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printf( " ok\n" );
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/*
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* 5. Handshake
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*/
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printf( " . Performing the DTLS handshake..." );
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fflush( stdout );
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do ret = mbedtls_ssl_handshake( &ssl );
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while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
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ret == MBEDTLS_ERR_SSL_WANT_WRITE );
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if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED )
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{
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printf( " hello verification requested\n" );
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ret = 0;
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goto reset;
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}
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else if( ret != 0 )
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{
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printf( " failed\n ! mbedtls_ssl_handshake returned -0x%x\n\n", (unsigned int) -ret );
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goto reset;
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}
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printf( " ok\n" );
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/*
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* 6. Read the echo Request
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*/
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printf( " < Read from client:" );
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fflush( stdout );
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len = sizeof( buf ) - 1;
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memset( buf, 0, sizeof( buf ) );
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do ret = mbedtls_ssl_read( &ssl, buf, len );
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while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
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ret == MBEDTLS_ERR_SSL_WANT_WRITE );
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if( ret <= 0 )
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{
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switch( ret )
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{
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case MBEDTLS_ERR_SSL_TIMEOUT:
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printf( " timeout\n\n" );
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goto reset;
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case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
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printf( " connection was closed gracefully\n" );
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ret = 0;
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goto close_notify;
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default:
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printf( " mbedtls_ssl_read returned -0x%x\n\n", (unsigned int) -ret );
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goto reset;
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}
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}
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len = ret;
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printf( " %d bytes read\n\n%s\n\n", len, buf );
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/*
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* 7. Write the 200 Response
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*/
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printf( " > Write to client:" );
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fflush( stdout );
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do ret = mbedtls_ssl_write( &ssl, buf, len );
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while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
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ret == MBEDTLS_ERR_SSL_WANT_WRITE );
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if( ret < 0 )
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{
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printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
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goto exit;
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}
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len = ret;
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printf( " %d bytes written\n\n%s\n\n", len, buf );
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/*
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* 8. Done, cleanly close the connection
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*/
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close_notify:
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printf( " . Closing the connection..." );
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/* No error checking, the connection might be closed already */
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do ret = mbedtls_ssl_close_notify( &ssl );
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while( ret == MBEDTLS_ERR_SSL_WANT_WRITE );
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ret = 0;
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printf( " done\n" );
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goto reset;
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/*
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* Final clean-ups and exit
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*/
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exit:
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#ifdef MBEDTLS_ERROR_C
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if( ret != 0 )
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{
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char error_buf[100];
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mbedtls_strerror( ret, error_buf, 100 );
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printf( "Last error was: %d - %s\n\n", ret, error_buf );
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}
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#endif
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mbedtls_net_free( &client_fd );
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mbedtls_net_free( &listen_fd );
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mbedtls_x509_crt_free( &srvcert );
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mbedtls_pk_free( &pkey );
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mbedtls_ssl_free( &ssl );
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mbedtls_ssl_config_free( &conf );
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mbedtls_ssl_cookie_free( &cookie_ctx );
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#if defined(MBEDTLS_SSL_CACHE_C)
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mbedtls_ssl_cache_free( &cache );
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#endif
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mbedtls_ctr_drbg_free( &ctr_drbg );
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mbedtls_entropy_free( &entropy );
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#if defined(_WIN32)
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printf( " Press Enter to exit this program.\n" );
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fflush( stdout ); getchar();
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#endif
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/* Shell can not handle large exit numbers -> 1 for errors */
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if( ret < 0 )
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ret = 1;
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mbedtls_exit( ret );
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}
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#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_PROTO_DTLS &&
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MBEDTLS_SSL_COOKIE_C && MBEDTLS_NET_C && MBEDTLS_ENTROPY_C &&
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MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_RSA_C
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&& MBEDTLS_CERTS_C && MBEDTLS_PEM_PARSE_C && MBEDTLS_TIMING_C */
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