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mbedtls/programs/ssl/ssl_fork_server.c
Manuel Pégourié-Gonnard 3ef6a6dc5c Fix const-ness in mbedtls_param_failed() 
The previous prototype gave warnings are the strings produced by #cond and
__FILE__ are const, so we shouldn't implicitly cast them to non-const.

While at it modifying most example programs:
- include the header that has the function declaration, so that the definition
  can be checked to match by the compiler
- fix whitespace
- make it work even if PLATFORM_C is not defined:
    - CHECK_PARAMS is not documented as depending on PLATFORM_C and there is
      no reason why it should
    - so, remove the corresponding #if defined in each program...
    - and add missing #defines for mbedtls_exit when needed

The result has been tested (make all test with -Werror) with the following
configurations:

- full with    CHECK_PARAMS with    PLATFORM_C
- full with    CHECK_PARAMS without PLATFORM_C
- full without CHECK_PARAMS without PLATFORM_C
- full without CHECK_PARAMS with    PLATFORM_C

Additionally, it has been manually tested that adding

    mbedtls_aes_init( NULL );

near the normal call to mbedtls_aes_init() in programs/aes/aescrypt2.c has the
expected effect when running the program.
2018-12-11 12:28:56 +01:00

436 lines
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/*
* SSL server demonstration program using fork() for handling multiple clients
*
* 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_fprintf fprintf
#define mbedtls_printf printf
#define mbedtls_time_t time_t
#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_CERTS_C) || \
!defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
!defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) || \
!defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
!defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_TIMING_C) || \
!defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_PEM_PARSE_C)
int main( int argc, char *argv[] )
{
((void) argc);
((void) argv);
mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
"and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
"MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
"MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
"MBEDTLS_TIMING_C and/or MBEDTLS_PEM_PARSE_C not defined.\n");
return( 0 );
}
#elif defined(_WIN32)
int main( void )
{
mbedtls_printf("_WIN32 defined. This application requires fork() and signals "
"to work correctly.\n");
return( 0 );
}
#else
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/certs.h"
#include "mbedtls/x509.h"
#include "mbedtls/ssl.h"
#include "mbedtls/net_sockets.h"
#include "mbedtls/timing.h"
#include <string.h>
#include <signal.h>
#if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
#include <unistd.h>
#endif
#define HTTP_RESPONSE \
"HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
"<h2>mbed TLS Test Server</h2>\r\n" \
"<p>Successful connection using: %s</p>\r\n"
#define DEBUG_LEVEL 0
#if defined(MBEDTLS_CHECK_PARAMS)
#include "mbedtls/platform_util.h"
void mbedtls_param_failed( const char *failure_condition,
const char *file,
int line )
{
mbedtls_printf( "%s:%i: Input param failed - %s\n",
file, line, failure_condition );
mbedtls_exit( MBEDTLS_EXIT_FAILURE );
}
#endif
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 );
}
int main( void )
{
int ret = 1, len, cnt = 0, pid;
int exit_code = MBEDTLS_EXIT_FAILURE;
mbedtls_net_context listen_fd, client_fd;
unsigned char buf[1024];
const char *pers = "ssl_fork_server";
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_context ssl;
mbedtls_ssl_config conf;
mbedtls_x509_crt srvcert;
mbedtls_pk_context pkey;
mbedtls_net_init( &listen_fd );
mbedtls_net_init( &client_fd );
mbedtls_ssl_init( &ssl );
mbedtls_ssl_config_init( &conf );
mbedtls_entropy_init( &entropy );
mbedtls_pk_init( &pkey );
mbedtls_x509_crt_init( &srvcert );
mbedtls_ctr_drbg_init( &ctr_drbg );
signal( SIGCHLD, SIG_IGN );
/*
* 0. Initial seeding of the RNG
*/
mbedtls_printf( "\n . Initial seeding of the random generator..." );
fflush( stdout );
if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
mbedtls_printf( " failed! mbedtls_ctr_drbg_seed returned %d\n\n", ret );
goto exit;
}
mbedtls_printf( " ok\n" );
/*
* 1. Load the certificates and private RSA key
*/
mbedtls_printf( " . Loading the server cert. and key..." );
fflush( stdout );
/*
* This demonstration program uses embedded test certificates.
* Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
* server and CA certificates, as well as mbedtls_pk_parse_keyfile().
*/
ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
mbedtls_test_srv_crt_len );
if( ret != 0 )
{
mbedtls_printf( " failed! mbedtls_x509_crt_parse returned %d\n\n", ret );
goto exit;
}
ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
mbedtls_test_cas_pem_len );
if( ret != 0 )
{
mbedtls_printf( " failed! mbedtls_x509_crt_parse returned %d\n\n", ret );
goto exit;
}
ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
mbedtls_test_srv_key_len, NULL, 0 );
if( ret != 0 )
{
mbedtls_printf( " failed! mbedtls_pk_parse_key returned %d\n\n", ret );
goto exit;
}
mbedtls_printf( " ok\n" );
/*
* 1b. Prepare SSL configuration
*/
mbedtls_printf( " . Configuring SSL..." );
fflush( stdout );
if( ( ret = mbedtls_ssl_config_defaults( &conf,
MBEDTLS_SSL_IS_SERVER,
MBEDTLS_SSL_TRANSPORT_STREAM,
MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
{
mbedtls_printf( " failed! mbedtls_ssl_config_defaults returned %d\n\n", ret );
goto exit;
}
mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
{
mbedtls_printf( " failed! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
goto exit;
}
mbedtls_printf( " ok\n" );
/*
* 2. Setup the listening TCP socket
*/
mbedtls_printf( " . Bind on https://localhost:4433/ ..." );
fflush( stdout );
if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
{
mbedtls_printf( " failed! mbedtls_net_bind returned %d\n\n", ret );
goto exit;
}
mbedtls_printf( " ok\n" );
while( 1 )
{
/*
* 3. Wait until a client connects
*/
mbedtls_net_init( &client_fd );
mbedtls_ssl_init( &ssl );
mbedtls_printf( " . Waiting for a remote connection ...\n" );
fflush( stdout );
if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
NULL, 0, NULL ) ) != 0 )
{
mbedtls_printf( " failed! mbedtls_net_accept returned %d\n\n", ret );
goto exit;
}
/*
* 3.5. Forking server thread
*/
mbedtls_printf( " . Forking to handle connection ..." );
fflush( stdout );
pid = fork();
if( pid < 0 )
{
mbedtls_printf(" failed! fork returned %d\n\n", pid );
goto exit;
}
if( pid != 0 )
{
mbedtls_printf( " ok\n" );
if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
(const unsigned char *) "parent",
6 ) ) != 0 )
{
mbedtls_printf( " failed! mbedtls_ctr_drbg_reseed returned %d\n\n", ret );
goto exit;
}
continue;
}
mbedtls_net_init( &listen_fd );
pid = getpid();
/*
* 4. Setup stuff
*/
mbedtls_printf( "pid %d: Setting up the SSL data.\n", pid );
fflush( stdout );
if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
(const unsigned char *) "child",
5 ) ) != 0 )
{
mbedtls_printf(
"pid %d: SSL setup failed! mbedtls_ctr_drbg_reseed returned %d\n\n",
pid, ret );
goto exit;
}
if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
{
mbedtls_printf(
"pid %d: SSL setup failed! mbedtls_ssl_setup returned %d\n\n",
pid, ret );
goto exit;
}
mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
mbedtls_printf( "pid %d: SSL setup ok\n", pid );
/*
* 5. Handshake
*/
mbedtls_printf( "pid %d: Performing the SSL/TLS handshake.\n", pid );
fflush( stdout );
while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
{
if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
{
mbedtls_printf(
"pid %d: SSL handshake failed! mbedtls_ssl_handshake returned %d\n\n",
pid, ret );
goto exit;
}
}
mbedtls_printf( "pid %d: SSL handshake ok\n", pid );
/*
* 6. Read the HTTP Request
*/
mbedtls_printf( "pid %d: Start reading from client.\n", pid );
fflush( stdout );
do
{
len = sizeof( buf ) - 1;
memset( buf, 0, sizeof( buf ) );
ret = mbedtls_ssl_read( &ssl, buf, len );
if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
continue;
if( ret <= 0 )
{
switch( ret )
{
case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
mbedtls_printf( "pid %d: connection was closed gracefully\n", pid );
break;
case MBEDTLS_ERR_NET_CONN_RESET:
mbedtls_printf( "pid %d: connection was reset by peer\n", pid );
break;
default:
mbedtls_printf( "pid %d: mbedtls_ssl_read returned %d\n", pid, ret );
break;
}
break;
}
len = ret;
mbedtls_printf( "pid %d: %d bytes read\n\n%s", pid, len, (char *) buf );
if( ret > 0 )
break;
}
while( 1 );
/*
* 7. Write the 200 Response
*/
mbedtls_printf( "pid %d: Start writing to client.\n", pid );
fflush( stdout );
len = sprintf( (char *) buf, HTTP_RESPONSE,
mbedtls_ssl_get_ciphersuite( &ssl ) );
while( cnt++ < 100 )
{
while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
{
if( ret == MBEDTLS_ERR_NET_CONN_RESET )
{
mbedtls_printf(
"pid %d: Write failed! peer closed the connection\n\n", pid );
goto exit;
}
if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
{
mbedtls_printf(
"pid %d: Write failed! mbedtls_ssl_write returned %d\n\n",
pid, ret );
goto exit;
}
}
len = ret;
mbedtls_printf( "pid %d: %d bytes written\n\n%s\n", pid, len, (char *) buf );
mbedtls_net_usleep( 1000000 );
}
mbedtls_ssl_close_notify( &ssl );
goto exit;
}
exit_code = MBEDTLS_EXIT_SUCCESS;
exit:
mbedtls_net_free( &client_fd );
mbedtls_net_free( &listen_fd );
mbedtls_x509_crt_free( &srvcert );
mbedtls_pk_free( &pkey );
mbedtls_ssl_free( &ssl );
mbedtls_ssl_config_free( &conf );
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
return( exit_code );
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_PARSE_C &&
! _WIN32 */
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