345 lines
9.9 KiB
C
Executable file
345 lines
9.9 KiB
C
Executable file
/*
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* SSL client 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 OR GPL-2.0-or-later
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*
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* This file is provided under the Apache License 2.0, or the
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* GNU General Public License v2.0 or later.
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*
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* **********
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* Apache License 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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* **********
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*
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* **********
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* GNU General Public License v2.0 or later:
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* **********
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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_time time
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#define mbedtls_time_t time_t
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#define mbedtls_fprintf fprintf
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#define mbedtls_printf printf
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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_CLI_C) || \
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!defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
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!defined(MBEDTLS_CERTS_C) || !defined(MBEDTLS_PEM_PARSE_C) || \
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!defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C)
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int main( void )
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{
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mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
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"MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_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 "
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"not defined.\n");
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mbedtls_exit( 0 );
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}
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#else
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#include "mbedtls/net_sockets.h"
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#include "mbedtls/debug.h"
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#include "mbedtls/ssl.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/error.h"
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#include "mbedtls/certs.h"
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#include <string.h>
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#define SERVER_PORT "4433"
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#define SERVER_NAME "localhost"
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#define GET_REQUEST "GET / HTTP/1.0\r\n\r\n"
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#define DEBUG_LEVEL 1
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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;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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mbedtls_net_context server_fd;
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uint32_t flags;
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unsigned char buf[1024];
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const char *pers = "ssl_client1";
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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 cacert;
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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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* 0. Initialize the RNG and the session data
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*/
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mbedtls_net_init( &server_fd );
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mbedtls_ssl_init( &ssl );
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mbedtls_ssl_config_init( &conf );
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mbedtls_x509_crt_init( &cacert );
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mbedtls_ctr_drbg_init( &ctr_drbg );
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mbedtls_printf( "\n . Seeding the random number generator..." );
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fflush( stdout );
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mbedtls_entropy_init( &entropy );
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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\n ! mbedtls_ctr_drbg_seed returned %d\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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* 0. Initialize certificates
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*/
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mbedtls_printf( " . Loading the CA root certificate ..." );
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fflush( stdout );
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ret = mbedtls_x509_crt_parse( &cacert, (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\n ! mbedtls_x509_crt_parse returned -0x%x\n\n", -ret );
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goto exit;
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}
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mbedtls_printf( " ok (%d skipped)\n", ret );
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/*
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* 1. Start the connection
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*/
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mbedtls_printf( " . Connecting to tcp/%s/%s...", SERVER_NAME, SERVER_PORT );
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fflush( stdout );
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if( ( ret = mbedtls_net_connect( &server_fd, SERVER_NAME,
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SERVER_PORT, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_net_connect 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 stuff
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*/
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mbedtls_printf( " . Setting up the SSL/TLS structure..." );
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fflush( stdout );
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if( ( ret = mbedtls_ssl_config_defaults( &conf,
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MBEDTLS_SSL_IS_CLIENT,
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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\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_printf( " ok\n" );
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/* OPTIONAL is not optimal for security,
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* but makes interop easier in this simplified example */
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mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
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mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
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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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if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
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{
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mbedtls_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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if( ( ret = mbedtls_ssl_set_hostname( &ssl, SERVER_NAME ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
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/*
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* 4. Handshake
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*/
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mbedtls_printf( " . Performing the SSL/TLS handshake..." );
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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( " failed\n ! mbedtls_ssl_handshake returned -0x%x\n\n", -ret );
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goto exit;
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}
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}
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mbedtls_printf( " ok\n" );
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/*
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* 5. Verify the server certificate
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*/
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mbedtls_printf( " . Verifying peer X.509 certificate..." );
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/* In real life, we probably want to bail out when ret != 0 */
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if( ( flags = mbedtls_ssl_get_verify_result( &ssl ) ) != 0 )
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{
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char vrfy_buf[512];
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mbedtls_printf( " failed\n" );
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mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
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mbedtls_printf( "%s\n", vrfy_buf );
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}
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else
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mbedtls_printf( " ok\n" );
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/*
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* 3. Write the GET request
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*/
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mbedtls_printf( " > Write to server:" );
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fflush( stdout );
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len = sprintf( (char *) buf, GET_REQUEST );
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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_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
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{
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mbedtls_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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}
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len = ret;
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mbedtls_printf( " %d bytes written\n\n%s", len, (char *) buf );
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/*
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* 7. Read the HTTP response
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*/
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mbedtls_printf( " < Read from server:" );
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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 == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY )
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break;
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if( ret < 0 )
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{
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mbedtls_printf( "failed\n ! mbedtls_ssl_read returned %d\n\n", ret );
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break;
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}
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if( ret == 0 )
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{
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mbedtls_printf( "\n\nEOF\n\n" );
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break;
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}
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len = ret;
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mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
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}
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while( 1 );
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mbedtls_ssl_close_notify( &ssl );
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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#ifdef MBEDTLS_ERROR_C
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if( exit_code != MBEDTLS_EXIT_SUCCESS )
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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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mbedtls_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( &server_fd );
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mbedtls_x509_crt_free( &cacert );
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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 && MBEDTLS_SSL_TLS_C &&
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MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
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MBEDTLS_CERTS_C && MBEDTLS_PEM_PARSE_C && MBEDTLS_CTR_DRBG_C &&
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MBEDTLS_X509_CRT_PARSE_C */
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