421 lines
13 KiB
C
421 lines
13 KiB
C
/*
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* SSL server demonstration program using fork() for handling multiple clients
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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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#include "mbedtls/build_info.h"
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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_fprintf fprintf
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#define mbedtls_printf printf
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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 /* MBEDTLS_PLATFORM_C */
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#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
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!defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_SRV_C) || \
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!defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
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!defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) || \
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!defined(MBEDTLS_TIMING_C) || !defined(MBEDTLS_FS_IO) || \
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!defined(MBEDTLS_PEM_PARSE_C)
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int main( int argc, char *argv[] )
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{
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((void) argc);
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((void) argv);
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mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C "
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"and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
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"MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
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"MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
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"MBEDTLS_TIMING_C and/or MBEDTLS_PEM_PARSE_C not defined.\n");
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mbedtls_exit( 0 );
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}
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#elif defined(_WIN32)
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int main( void )
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{
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mbedtls_printf("_WIN32 defined. This application requires fork() and signals "
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"to work correctly.\n");
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mbedtls_exit( 0 );
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}
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#else
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "test/certs.h"
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#include "mbedtls/x509.h"
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#include "mbedtls/ssl.h"
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#include "mbedtls/net_sockets.h"
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#include "mbedtls/timing.h"
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#include <string.h>
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#include <signal.h>
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#if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
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#include <unistd.h>
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#endif
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#define HTTP_RESPONSE \
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"HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
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"<h2>mbed TLS Test Server</h2>\r\n" \
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"<p>Successful connection using: %s</p>\r\n"
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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 = 1, len, cnt = 0, pid;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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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 = "ssl_fork_server";
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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_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_entropy_init( &entropy );
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mbedtls_pk_init( &pkey );
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mbedtls_x509_crt_init( &srvcert );
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mbedtls_ctr_drbg_init( &ctr_drbg );
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signal( SIGCHLD, SIG_IGN );
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/*
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* 0. Initial seeding of the RNG
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*/
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mbedtls_printf( "\n . Initial seeding of the random 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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mbedtls_printf( " failed! mbedtls_ctr_drbg_seed returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_printf( " ok\n" );
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/*
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* 1. Load the certificates and private RSA key
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*/
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mbedtls_printf( " . 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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mbedtls_printf( " failed! 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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mbedtls_printf( " failed! 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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mbedtls_ctr_drbg_random, &ctr_drbg );
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if( ret != 0 )
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{
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mbedtls_printf( " failed! mbedtls_pk_parse_key returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_printf( " ok\n" );
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/*
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* 1b. Prepare SSL configuration
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*/
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mbedtls_printf( " . Configuring SSL..." );
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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_STREAM,
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MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
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{
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mbedtls_printf( " failed! 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_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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mbedtls_printf( " failed! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_printf( " ok\n" );
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/*
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* 2. Setup the listening TCP socket
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*/
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mbedtls_printf( " . Bind on https://localhost:4433/ ..." );
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fflush( stdout );
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if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
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{
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mbedtls_printf( " failed! mbedtls_net_bind returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_printf( " ok\n" );
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while( 1 )
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{
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/*
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* 3. Wait until a client connects
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*/
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mbedtls_net_init( &client_fd );
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mbedtls_ssl_init( &ssl );
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mbedtls_printf( " . Waiting for a remote connection ...\n" );
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fflush( stdout );
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if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
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NULL, 0, NULL ) ) != 0 )
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{
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mbedtls_printf( " failed! mbedtls_net_accept returned %d\n\n", ret );
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goto exit;
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}
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/*
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* 3.5. Forking server thread
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*/
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mbedtls_printf( " . Forking to handle connection ..." );
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fflush( stdout );
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pid = fork();
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if( pid < 0 )
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{
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mbedtls_printf(" failed! fork returned %d\n\n", pid );
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goto exit;
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}
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if( pid != 0 )
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{
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mbedtls_printf( " ok\n" );
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mbedtls_net_close( &client_fd );
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if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
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(const unsigned char *) "parent",
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6 ) ) != 0 )
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{
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mbedtls_printf( " failed! mbedtls_ctr_drbg_reseed returned %d\n\n", ret );
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goto exit;
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}
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continue;
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}
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mbedtls_net_close( &listen_fd );
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pid = getpid();
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/*
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* 4. Setup stuff
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*/
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mbedtls_printf( "pid %d: Setting up the SSL data.\n", pid );
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fflush( stdout );
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if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
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(const unsigned char *) "child",
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5 ) ) != 0 )
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{
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mbedtls_printf(
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"pid %d: SSL setup failed! mbedtls_ctr_drbg_reseed returned %d\n\n",
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pid, ret );
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goto exit;
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}
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if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
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{
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mbedtls_printf(
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"pid %d: SSL setup failed! mbedtls_ssl_setup returned %d\n\n",
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pid, ret );
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goto exit;
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}
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mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
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mbedtls_printf( "pid %d: SSL setup ok\n", pid );
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/*
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* 5. Handshake
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*/
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mbedtls_printf( "pid %d: Performing the SSL/TLS handshake.\n", pid );
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fflush( stdout );
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while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
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{
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if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
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{
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mbedtls_printf(
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"pid %d: SSL handshake failed! mbedtls_ssl_handshake returned %d\n\n",
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pid, ret );
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goto exit;
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}
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}
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mbedtls_printf( "pid %d: SSL handshake ok\n", pid );
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/*
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* 6. Read the HTTP Request
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*/
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mbedtls_printf( "pid %d: Start reading from client.\n", pid );
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fflush( stdout );
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do
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{
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len = sizeof( buf ) - 1;
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memset( buf, 0, sizeof( buf ) );
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ret = mbedtls_ssl_read( &ssl, buf, len );
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if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
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continue;
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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_PEER_CLOSE_NOTIFY:
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mbedtls_printf( "pid %d: connection was closed gracefully\n", pid );
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break;
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case MBEDTLS_ERR_NET_CONN_RESET:
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mbedtls_printf( "pid %d: connection was reset by peer\n", pid );
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break;
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default:
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mbedtls_printf( "pid %d: mbedtls_ssl_read returned %d\n", pid, ret );
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break;
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}
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break;
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}
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len = ret;
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mbedtls_printf( "pid %d: %d bytes read\n\n%s", pid, len, (char *) buf );
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if( ret > 0 )
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break;
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}
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while( 1 );
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/*
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* 7. Write the 200 Response
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*/
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mbedtls_printf( "pid %d: Start writing to client.\n", pid );
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fflush( stdout );
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len = sprintf( (char *) buf, HTTP_RESPONSE,
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mbedtls_ssl_get_ciphersuite( &ssl ) );
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while( cnt++ < 100 )
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{
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while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
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{
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if( ret == MBEDTLS_ERR_NET_CONN_RESET )
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{
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mbedtls_printf(
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"pid %d: Write failed! peer closed the connection\n\n", pid );
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goto exit;
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}
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if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
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{
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mbedtls_printf(
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"pid %d: Write failed! mbedtls_ssl_write returned %d\n\n",
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pid, ret );
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goto exit;
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}
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}
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len = ret;
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mbedtls_printf( "pid %d: %d bytes written\n\n%s\n", pid, len, (char *) buf );
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mbedtls_net_usleep( 1000000 );
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}
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mbedtls_ssl_close_notify( &ssl );
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goto exit;
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}
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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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_ctr_drbg_free( &ctr_drbg );
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mbedtls_entropy_free( &entropy );
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#if defined(_WIN32)
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mbedtls_printf( " Press Enter to exit this program.\n" );
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fflush( stdout ); getchar();
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#endif
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mbedtls_exit( exit_code );
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}
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#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
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MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
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MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_PARSE_C &&
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! _WIN32 */
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