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mbedtls/programs/ssl/ssl_pthread_server.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

532 lines
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/*
* SSL server demonstration program using pthread 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_snprintf snprintf
#define mbedtls_exit exit
#endif
#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_FS_IO) || \
!defined(MBEDTLS_THREADING_C) || !defined(MBEDTLS_THREADING_PTHREAD) || \
!defined(MBEDTLS_PEM_PARSE_C)
int main( void )
{
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_THREADING_C and/or MBEDTLS_THREADING_PTHREAD "
"and/or MBEDTLS_PEM_PARSE_C not defined.\n");
mbedtls_exit( 0 );
}
#else
#include <stdlib.h>
#include <string.h>
#if defined(_WIN32)
#include <windows.h>
#endif
#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/error.h"
#if defined(MBEDTLS_SSL_CACHE_C)
#include "mbedtls/ssl_cache.h"
#endif
#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
#include "mbedtls/memory_buffer_alloc.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
#define MAX_NUM_THREADS 5
mbedtls_threading_mutex_t debug_mutex;
static void my_mutexed_debug( void *ctx, int level,
const char *file, int line,
const char *str )
{
long int thread_id = (long int) pthread_self();
mbedtls_mutex_lock( &debug_mutex );
((void) level);
mbedtls_fprintf( (FILE *) ctx, "%s:%04d: [ #%ld ] %s",
file, line, thread_id, str );
fflush( (FILE *) ctx );
mbedtls_mutex_unlock( &debug_mutex );
}
typedef struct {
mbedtls_net_context client_fd;
int thread_complete;
const mbedtls_ssl_config *config;
} thread_info_t;
typedef struct {
int active;
thread_info_t data;
pthread_t thread;
} pthread_info_t;
static thread_info_t base_info;
static pthread_info_t threads[MAX_NUM_THREADS];
static void *handle_ssl_connection( void *data )
{
int ret, len;
thread_info_t *thread_info = (thread_info_t *) data;
mbedtls_net_context *client_fd = &thread_info->client_fd;
long int thread_id = (long int) pthread_self();
unsigned char buf[1024];
mbedtls_ssl_context ssl;
/* Make sure memory references are valid */
mbedtls_ssl_init( &ssl );
mbedtls_printf( " [ #%ld ] Setting up SSL/TLS data\n", thread_id );
/*
* 4. Get the SSL context ready
*/
if( ( ret = mbedtls_ssl_setup( &ssl, thread_info->config ) ) != 0 )
{
mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_setup returned -0x%04x\n",
thread_id, -ret );
goto thread_exit;
}
mbedtls_ssl_set_bio( &ssl, client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
/*
* 5. Handshake
*/
mbedtls_printf( " [ #%ld ] Performing the SSL/TLS handshake\n", thread_id );
while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
{
if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
{
mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_handshake returned -0x%04x\n",
thread_id, -ret );
goto thread_exit;
}
}
mbedtls_printf( " [ #%ld ] ok\n", thread_id );
/*
* 6. Read the HTTP Request
*/
mbedtls_printf( " [ #%ld ] < Read from client\n", thread_id );
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( " [ #%ld ] connection was closed gracefully\n",
thread_id );
goto thread_exit;
case MBEDTLS_ERR_NET_CONN_RESET:
mbedtls_printf( " [ #%ld ] connection was reset by peer\n",
thread_id );
goto thread_exit;
default:
mbedtls_printf( " [ #%ld ] mbedtls_ssl_read returned -0x%04x\n",
thread_id, -ret );
goto thread_exit;
}
}
len = ret;
mbedtls_printf( " [ #%ld ] %d bytes read\n=====\n%s\n=====\n",
thread_id, len, (char *) buf );
if( ret > 0 )
break;
}
while( 1 );
/*
* 7. Write the 200 Response
*/
mbedtls_printf( " [ #%ld ] > Write to client:\n", thread_id );
len = sprintf( (char *) buf, HTTP_RESPONSE,
mbedtls_ssl_get_ciphersuite( &ssl ) );
while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
{
if( ret == MBEDTLS_ERR_NET_CONN_RESET )
{
mbedtls_printf( " [ #%ld ] failed: peer closed the connection\n",
thread_id );
goto thread_exit;
}
if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
{
mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_write returned -0x%04x\n",
thread_id, ret );
goto thread_exit;
}
}
len = ret;
mbedtls_printf( " [ #%ld ] %d bytes written\n=====\n%s\n=====\n",
thread_id, len, (char *) buf );
mbedtls_printf( " [ #%ld ] . Closing the connection...", thread_id );
while( ( ret = mbedtls_ssl_close_notify( &ssl ) ) < 0 )
{
if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
ret != MBEDTLS_ERR_SSL_WANT_WRITE )
{
mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_close_notify returned -0x%04x\n",
thread_id, ret );
goto thread_exit;
}
}
mbedtls_printf( " ok\n" );
ret = 0;
thread_exit:
#ifdef MBEDTLS_ERROR_C
if( ret != 0 )
{
char error_buf[100];
mbedtls_strerror( ret, error_buf, 100 );
mbedtls_printf(" [ #%ld ] Last error was: -0x%04x - %s\n\n",
thread_id, -ret, error_buf );
}
#endif
mbedtls_net_free( client_fd );
mbedtls_ssl_free( &ssl );
thread_info->thread_complete = 1;
return( NULL );
}
static int thread_create( mbedtls_net_context *client_fd )
{
int ret, i;
/*
* Find in-active or finished thread slot
*/
for( i = 0; i < MAX_NUM_THREADS; i++ )
{
if( threads[i].active == 0 )
break;
if( threads[i].data.thread_complete == 1 )
{
mbedtls_printf( " [ main ] Cleaning up thread %d\n", i );
pthread_join(threads[i].thread, NULL );
memset( &threads[i], 0, sizeof(pthread_info_t) );
break;
}
}
if( i == MAX_NUM_THREADS )
return( -1 );
/*
* Fill thread-info for thread
*/
memcpy( &threads[i].data, &base_info, sizeof(base_info) );
threads[i].active = 1;
memcpy( &threads[i].data.client_fd, client_fd, sizeof( mbedtls_net_context ) );
if( ( ret = pthread_create( &threads[i].thread, NULL, handle_ssl_connection,
&threads[i].data ) ) != 0 )
{
return( ret );
}
return( 0 );
}
int main( void )
{
int ret;
mbedtls_net_context listen_fd, client_fd;
const char pers[] = "ssl_pthread_server";
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_config conf;
mbedtls_x509_crt srvcert;
mbedtls_x509_crt cachain;
mbedtls_pk_context pkey;
#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
unsigned char alloc_buf[100000];
#endif
#if defined(MBEDTLS_SSL_CACHE_C)
mbedtls_ssl_cache_context cache;
#endif
#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
mbedtls_memory_buffer_alloc_init( alloc_buf, sizeof(alloc_buf) );
#endif
#if defined(MBEDTLS_SSL_CACHE_C)
mbedtls_ssl_cache_init( &cache );
#endif
mbedtls_x509_crt_init( &srvcert );
mbedtls_x509_crt_init( &cachain );
mbedtls_ssl_config_init( &conf );
mbedtls_ctr_drbg_init( &ctr_drbg );
memset( threads, 0, sizeof(threads) );
mbedtls_net_init( &listen_fd );
mbedtls_net_init( &client_fd );
mbedtls_mutex_init( &debug_mutex );
base_info.config = &conf;
/*
* We use only a single entropy source that is used in all the threads.
*/
mbedtls_entropy_init( &entropy );
/*
* 1. Load the certificates and private RSA key
*/
mbedtls_printf( "\n . 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\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
goto exit;
}
ret = mbedtls_x509_crt_parse( &cachain, (const unsigned char *) mbedtls_test_cas_pem,
mbedtls_test_cas_pem_len );
if( ret != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
goto exit;
}
mbedtls_pk_init( &pkey );
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\n ! mbedtls_pk_parse_key returned %d\n\n", ret );
goto exit;
}
mbedtls_printf( " ok\n" );
/*
* 1b. Seed the random number generator
*/
mbedtls_printf( " . Seeding the random number generator..." );
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 -0x%04x\n",
-ret );
goto exit;
}
mbedtls_printf( " ok\n" );
/*
* 1c. Prepare SSL configuration
*/
mbedtls_printf( " . Setting up the SSL data...." );
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 -0x%04x\n",
-ret );
goto exit;
}
mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
mbedtls_ssl_conf_dbg( &conf, my_mutexed_debug, stdout );
/* mbedtls_ssl_cache_get() and mbedtls_ssl_cache_set() are thread-safe if
* MBEDTLS_THREADING_C is set.
*/
#if defined(MBEDTLS_SSL_CACHE_C)
mbedtls_ssl_conf_session_cache( &conf, &cache,
mbedtls_ssl_cache_get,
mbedtls_ssl_cache_set );
#endif
mbedtls_ssl_conf_ca_chain( &conf, &cachain, NULL );
if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
{
mbedtls_printf( " failed\n ! 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\n ! mbedtls_net_bind returned %d\n\n", ret );
goto exit;
}
mbedtls_printf( " ok\n" );
reset:
#ifdef MBEDTLS_ERROR_C
if( ret != 0 )
{
char error_buf[100];
mbedtls_strerror( ret, error_buf, 100 );
mbedtls_printf( " [ main ] Last error was: -0x%04x - %s\n", -ret, error_buf );
}
#endif
/*
* 3. Wait until a client connects
*/
mbedtls_printf( " [ main ] Waiting for a remote connection\n" );
if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
NULL, 0, NULL ) ) != 0 )
{
mbedtls_printf( " [ main ] failed: mbedtls_net_accept returned -0x%04x\n", ret );
goto exit;
}
mbedtls_printf( " [ main ] ok\n" );
mbedtls_printf( " [ main ] Creating a new thread\n" );
if( ( ret = thread_create( &client_fd ) ) != 0 )
{
mbedtls_printf( " [ main ] failed: thread_create returned %d\n", ret );
mbedtls_net_free( &client_fd );
goto reset;
}
ret = 0;
goto reset;
exit:
mbedtls_x509_crt_free( &srvcert );
mbedtls_pk_free( &pkey );
#if defined(MBEDTLS_SSL_CACHE_C)
mbedtls_ssl_cache_free( &cache );
#endif
mbedtls_ctr_drbg_free( &ctr_drbg );
mbedtls_entropy_free( &entropy );
mbedtls_ssl_config_free( &conf );
mbedtls_net_free( &listen_fd );
mbedtls_mutex_free( &debug_mutex );
#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
mbedtls_memory_buffer_alloc_free();
#endif
#if defined(_WIN32)
mbedtls_printf( " Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
mbedtls_exit( ret );
}
#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_THREADING_C &&
MBEDTLS_THREADING_PTHREAD && MBEDTLS_PEM_PARSE_C */
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