/* * SSL server demonstration program using fork() for handling multiple clients * * Copyright The Mbed TLS Contributors * 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. */ #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"); mbedtls_exit( 0 ); } #elif defined(_WIN32) int main( void ) { mbedtls_printf("_WIN32 defined. This application requires fork() and signals " "to work correctly.\n"); mbedtls_exit( 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 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" ); mbedtls_net_close( &client_fd ); 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_close( &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 mbedtls_exit( 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 */