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mbedtls/programs/x509/cert_app.c
Krzysztof Stachowiak a08652233d Unify the example programs' termination 
This is done to account for platforms, for which we want custom behavior
upon the program termination, hence we call `mbedtls_exit()` instead of
returning from `main()`.

For the sake of consistency, introduces the modifications have been made
to the test and utility examples as well. These, while less likely to be
used in the low level environments, won't suffer from such a change.
2020-05-11 22:20:32 +02:00

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/*
* Certificate reading application
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_time time
#define mbedtls_time_t time_t
#define mbedtls_fprintf fprintf
#define mbedtls_printf printf
#define mbedtls_exit exit
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif /* MBEDTLS_PLATFORM_C */
#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
!defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
!defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
!defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
!defined(MBEDTLS_CTR_DRBG_C)
int main( void )
{
mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
"MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
"MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
"MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_FS_IO and/or "
"MBEDTLS_CTR_DRBG_C not defined.\n");
mbedtls_exit( 0 );
}
#else
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/net_sockets.h"
#include "mbedtls/ssl.h"
#include "mbedtls/x509.h"
#include "mbedtls/debug.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MODE_NONE 0
#define MODE_FILE 1
#define MODE_SSL 2
#define DFL_MODE MODE_NONE
#define DFL_FILENAME "cert.crt"
#define DFL_CA_FILE ""
#define DFL_CRL_FILE ""
#define DFL_CA_PATH ""
#define DFL_SERVER_NAME "localhost"
#define DFL_SERVER_PORT "4433"
#define DFL_DEBUG_LEVEL 0
#define DFL_PERMISSIVE 0
#define USAGE_IO \
" ca_file=%%s The single file containing the top-level CA(s) you fully trust\n" \
" default: \"\" (none)\n" \
" crl_file=%%s The single CRL file you want to use\n" \
" default: \"\" (none)\n" \
" ca_path=%%s The path containing the top-level CA(s) you fully trust\n" \
" default: \"\" (none) (overrides ca_file)\n"
#define USAGE \
"\n usage: cert_app param=<>...\n" \
"\n acceptable parameters:\n" \
" mode=file|ssl default: none\n" \
" filename=%%s default: cert.crt\n" \
USAGE_IO \
" server_name=%%s default: localhost\n" \
" server_port=%%d default: 4433\n" \
" debug_level=%%d default: 0 (disabled)\n" \
" permissive=%%d default: 0 (disabled)\n" \
"\n"
/*
* global options
*/
struct options
{
int mode; /* the mode to run the application in */
const char *filename; /* filename of the certificate file */
const char *ca_file; /* the file with the CA certificate(s) */
const char *crl_file; /* the file with the CRL to use */
const char *ca_path; /* the path with the CA certificate(s) reside */
const char *server_name; /* hostname of the server (client only) */
const char *server_port; /* port on which the ssl service runs */
int debug_level; /* level of debugging */
int permissive; /* permissive parsing */
} opt;
static void my_debug( void *ctx, int level,
const char *file, int line,
const char *str )
{
((void) level);
mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
fflush( (FILE *) ctx );
}
static int my_verify( void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags )
{
char buf[1024];
((void) data);
mbedtls_printf( "\nVerify requested for (Depth %d):\n", depth );
mbedtls_x509_crt_info( buf, sizeof( buf ) - 1, "", crt );
mbedtls_printf( "%s", buf );
if ( ( *flags ) == 0 )
mbedtls_printf( " This certificate has no flags\n" );
else
{
mbedtls_x509_crt_verify_info( buf, sizeof( buf ), " ! ", *flags );
mbedtls_printf( "%s\n", buf );
}
return( 0 );
}
int main( int argc, char *argv[] )
{
int ret = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
mbedtls_net_context server_fd;
unsigned char buf[1024];
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_context ssl;
mbedtls_ssl_config conf;
mbedtls_x509_crt cacert;
mbedtls_x509_crl cacrl;
int i, j;
uint32_t flags;
int verify = 0;
char *p, *q;
const char *pers = "cert_app";
/*
* Set to sane values
*/
mbedtls_net_init( &server_fd );
mbedtls_ctr_drbg_init( &ctr_drbg );
mbedtls_ssl_init( &ssl );
mbedtls_ssl_config_init( &conf );
mbedtls_x509_crt_init( &cacert );
#if defined(MBEDTLS_X509_CRL_PARSE_C)
mbedtls_x509_crl_init( &cacrl );
#else
/* Zeroize structure as CRL parsing is not supported and we have to pass
it to the verify function */
memset( &cacrl, 0, sizeof(mbedtls_x509_crl) );
#endif
if( argc == 0 )
{
usage:
mbedtls_printf( USAGE );
goto exit;
}
opt.mode = DFL_MODE;
opt.filename = DFL_FILENAME;
opt.ca_file = DFL_CA_FILE;
opt.crl_file = DFL_CRL_FILE;
opt.ca_path = DFL_CA_PATH;
opt.server_name = DFL_SERVER_NAME;
opt.server_port = DFL_SERVER_PORT;
opt.debug_level = DFL_DEBUG_LEVEL;
opt.permissive = DFL_PERMISSIVE;
for( i = 1; i < argc; i++ )
{
p = argv[i];
if( ( q = strchr( p, '=' ) ) == NULL )
goto usage;
*q++ = '\0';
for( j = 0; p + j < q; j++ )
{
if( argv[i][j] >= 'A' && argv[i][j] <= 'Z' )
argv[i][j] |= 0x20;
}
if( strcmp( p, "mode" ) == 0 )
{
if( strcmp( q, "file" ) == 0 )
opt.mode = MODE_FILE;
else if( strcmp( q, "ssl" ) == 0 )
opt.mode = MODE_SSL;
else
goto usage;
}
else if( strcmp( p, "filename" ) == 0 )
opt.filename = q;
else if( strcmp( p, "ca_file" ) == 0 )
opt.ca_file = q;
else if( strcmp( p, "crl_file" ) == 0 )
opt.crl_file = q;
else if( strcmp( p, "ca_path" ) == 0 )
opt.ca_path = q;
else if( strcmp( p, "server_name" ) == 0 )
opt.server_name = q;
else if( strcmp( p, "server_port" ) == 0 )
opt.server_port = q;
else if( strcmp( p, "debug_level" ) == 0 )
{
opt.debug_level = atoi( q );
if( opt.debug_level < 0 || opt.debug_level > 65535 )
goto usage;
}
else if( strcmp( p, "permissive" ) == 0 )
{
opt.permissive = atoi( q );
if( opt.permissive < 0 || opt.permissive > 1 )
goto usage;
}
else
goto usage;
}
/*
* 1.1. Load the trusted CA
*/
mbedtls_printf( " . Loading the CA root certificate ..." );
fflush( stdout );
if( strlen( opt.ca_path ) )
{
if( ( ret = mbedtls_x509_crt_parse_path( &cacert, opt.ca_path ) ) < 0 )
{
mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_path returned -0x%x\n\n", -ret );
goto exit;
}
verify = 1;
}
else if( strlen( opt.ca_file ) )
{
if( ( ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file ) ) < 0 )
{
mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_file returned -0x%x\n\n", -ret );
goto exit;
}
verify = 1;
}
mbedtls_printf( " ok (%d skipped)\n", ret );
#if defined(MBEDTLS_X509_CRL_PARSE_C)
if( strlen( opt.crl_file ) )
{
if( ( ret = mbedtls_x509_crl_parse_file( &cacrl, opt.crl_file ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_x509_crl_parse returned -0x%x\n\n", -ret );
goto exit;
}
verify = 1;
}
#endif
if( opt.mode == MODE_FILE )
{
mbedtls_x509_crt crt;
mbedtls_x509_crt *cur = &crt;
mbedtls_x509_crt_init( &crt );
/*
* 1.1. Load the certificate(s)
*/
mbedtls_printf( "\n . Loading the certificate(s) ..." );
fflush( stdout );
ret = mbedtls_x509_crt_parse_file( &crt, opt.filename );
if( ret < 0 )
{
mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_file returned %d\n\n", ret );
mbedtls_x509_crt_free( &crt );
goto exit;
}
if( opt.permissive == 0 && ret > 0 )
{
mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse failed to parse %d certificates\n\n", ret );
mbedtls_x509_crt_free( &crt );
goto exit;
}
mbedtls_printf( " ok\n" );
/*
* 1.2 Print the certificate(s)
*/
while( cur != NULL )
{
mbedtls_printf( " . Peer certificate information ...\n" );
ret = mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
cur );
if( ret == -1 )
{
mbedtls_printf( " failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret );
mbedtls_x509_crt_free( &crt );
goto exit;
}
mbedtls_printf( "%s\n", buf );
cur = cur->next;
}
/*
* 1.3 Verify the certificate
*/
if( verify )
{
mbedtls_printf( " . Verifying X.509 certificate..." );
if( ( ret = mbedtls_x509_crt_verify( &crt, &cacert, &cacrl, NULL, &flags,
my_verify, NULL ) ) != 0 )
{
char vrfy_buf[512];
mbedtls_printf( " failed\n" );
mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
mbedtls_printf( "%s\n", vrfy_buf );
}
else
mbedtls_printf( " ok\n" );
}
mbedtls_x509_crt_free( &crt );
}
else if( opt.mode == MODE_SSL )
{
/*
* 1. Initialize the RNG and the session data
*/
mbedtls_printf( "\n . Seeding the random number generator..." );
fflush( stdout );
mbedtls_entropy_init( &entropy );
if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
goto ssl_exit;
}
mbedtls_printf( " ok\n" );
#if defined(MBEDTLS_DEBUG_C)
mbedtls_debug_set_threshold( opt.debug_level );
#endif
/*
* 2. Start the connection
*/
mbedtls_printf( " . SSL connection to tcp/%s/%s...", opt.server_name,
opt.server_port );
fflush( stdout );
if( ( ret = mbedtls_net_connect( &server_fd, opt.server_name,
opt.server_port, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
goto ssl_exit;
}
/*
* 3. Setup stuff
*/
if( ( ret = mbedtls_ssl_config_defaults( &conf,
MBEDTLS_SSL_IS_CLIENT,
MBEDTLS_SSL_TRANSPORT_STREAM,
MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
goto exit;
}
if( verify )
{
mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_REQUIRED );
mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
mbedtls_ssl_conf_verify( &conf, my_verify, NULL );
}
else
mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_NONE );
mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
goto ssl_exit;
}
if( ( ret = mbedtls_ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
goto ssl_exit;
}
mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
/*
* 4. Handshake
*/
while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
{
if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
{
mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d\n\n", ret );
goto ssl_exit;
}
}
mbedtls_printf( " ok\n" );
/*
* 5. Print the certificate
*/
mbedtls_printf( " . Peer certificate information ...\n" );
ret = mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
ssl.session->peer_cert );
if( ret == -1 )
{
mbedtls_printf( " failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret );
goto ssl_exit;
}
mbedtls_printf( "%s\n", buf );
mbedtls_ssl_close_notify( &ssl );
ssl_exit:
mbedtls_ssl_free( &ssl );
mbedtls_ssl_config_free( &conf );
}
else
goto usage;
exit_code = MBEDTLS_EXIT_SUCCESS;
exit:
mbedtls_net_free( &server_fd );
mbedtls_x509_crt_free( &cacert );
#if defined(MBEDTLS_X509_CRL_PARSE_C)
mbedtls_x509_crl_free( &cacrl );
#endif
mbedtls_ctr_drbg_free( &ctr_drbg );
mbedtls_entropy_free( &entropy );
#if defined(_WIN32)
mbedtls_printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
mbedtls_exit( exit_code );
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
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