git.sur5r.net Git - freertos/blob - FreeRTOS-Plus/Demo/FreeRTOS_Plus_CyaSSL_Windows_Simulator/SecureTCPServerTask.c

   1 /*\r
   2     FreeRTOS V8.1.2 - Copyright (C) 2014 Real Time Engineers Ltd. \r
   3     All rights reserved\r
   4 \r
   5     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
   6 \r
   7     ***************************************************************************\r
   8      *                                                                       *\r
   9      *    FreeRTOS provides completely free yet professionally developed,    *\r
  10      *    robust, strictly quality controlled, supported, and cross          *\r
  11      *    platform software that has become a de facto standard.             *\r
  12      *                                                                       *\r
  13      *    Help yourself get started quickly and support the FreeRTOS         *\r
  14      *    project by purchasing a FreeRTOS tutorial book, reference          *\r
  15      *    manual, or both from: http://www.FreeRTOS.org/Documentation        *\r
  16      *                                                                       *\r
  17      *    Thank you!                                                         *\r
  18      *                                                                       *\r
  19     ***************************************************************************\r
  20 \r
  21     This file is part of the FreeRTOS distribution.\r
  22 \r
  23     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  24     the terms of the GNU General Public License (version 2) as published by the\r
  25     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
  26 \r
  27     >>!   NOTE: The modification to the GPL is included to allow you to     !<<\r
  28     >>!   distribute a combined work that includes FreeRTOS without being   !<<\r
  29     >>!   obliged to provide the source code for proprietary components     !<<\r
  30     >>!   outside of the FreeRTOS kernel.                                   !<<\r
  31 \r
  32     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
  33     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
  34     FOR A PARTICULAR PURPOSE.  Full license text is available from the following\r
  35     link: http://www.freertos.org/a00114.html\r
  36 \r
  37     1 tab == 4 spaces!\r
  38 \r
  39     ***************************************************************************\r
  40      *                                                                       *\r
  41      *    Having a problem?  Start by reading the FAQ "My application does   *\r
  42      *    not run, what could be wrong?"                                     *\r
  43      *                                                                       *\r
  44      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  45      *                                                                       *\r
  46     ***************************************************************************\r
  47 \r
  48     http://www.FreeRTOS.org - Documentation, books, training, latest versions,\r
  49     license and Real Time Engineers Ltd. contact details.\r
  50 \r
  51     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  52     including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
  53     compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
  54 \r
  55     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High\r
  56     Integrity Systems to sell under the OpenRTOS brand.  Low cost OpenRTOS\r
  57     licenses offer ticketed support, indemnification and middleware.\r
  58 \r
  59     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
  60     engineered and independently SIL3 certified version for use in safety and\r
  61     mission critical applications that require provable dependability.\r
  62 \r
  63     1 tab == 4 spaces!\r
  64 */\r
  65 \r
  66 #pragma comment( lib, "ws2_32.lib" )\r
  67 \r
  68 /* Win32 includes. */\r
  69 #include <WinSock2.h>\r
  70 \r
  71 /* CyaSSL includes. */\r
  72 #include "cyassl/ssl.h"\r
  73 \r
  74 /* Standard includes. */\r
  75 #include <stdint.h>\r
  76 #include <stdio.h>\r
  77 \r
  78 /* FreeRTOS includes. */\r
  79 #include "FreeRTOS.h"\r
  80 #include "task.h"\r
  81 \r
  82 /* This application is using the FreeRTOS Windows simulator, which uses the\r
  83 FreeRTOS scheduler to schedule FreeRTOS task within the Windows environment.\r
  84 The Windows envrionment must not be allowed to block any Windows threads that\r
  85 are running FreeRTOS tasks, unless the FreeRTOS task is running at the FreeRTOS\r
  86 idle priority.  For simplicity, this demo uses the Windows TCP/IP stack, the\r
  87 API for which can cause Windows threads to block.  Therefore, any FreeRTOS task\r
  88 that makes calls to the Windows TCP/IP stack must be assigned the idle prioity.\r
  89 Note this is only a restriction of the simulated Windows environment - real\r
  90 FreeRTOS ports do not have this restriction. */\r
  91 #define sstSECURE_CLIENT_TASK_PRIORITY          ( tskIDLE_PRIORITY )\r
  92 \r
  93 /*-----------------------------------------------------------*/\r
  94 \r
  95 /*\r
  96  * Open, configures and binds the server's TCP socket.\r
  97  */\r
  98 static SOCKET prvOpenServerSocket( void );\r
  99 \r
 100 /* \r
 101  * Prepare the CyaSSL library for use.\r
 102  */\r
 103 static void prvInitialiseCyaSSL( void );\r
 104 \r
 105 /*\r
 106  * The task that implements the client side of the connection.\r
 107  */\r
 108 extern void vSecureTCPClientTask( void *pvParameters );\r
 109 \r
 110 /*-----------------------------------------------------------*/\r
 111 \r
 112 /* The CyaSSL context for the server. */\r
 113 static CYASSL_CTX* xCyaSSL_ServerContext = NULL;\r
 114 \r
 115 /*-----------------------------------------------------------*/\r
 116 \r
 117 /* See the comments at the top of main.c. */\r
 118 void vSecureTCPServerTask( void *pvParameters )\r
 119 {\r
 120 BaseType_t xReturned;\r
 121 long lBytes;\r
 122 uint8_t cReceivedString[ 60 ];\r
 123 struct sockaddr_in xClient;\r
 124 int xClientAddressLength = sizeof( struct sockaddr_in );\r
 125 SOCKET xListeningSocket, xConnectedSocket;\r
 126 CYASSL* xCyaSSL_Object; /* Only one connection is accepted at a time, so only one object is needed at a time. */\r
 127 \r
 128         /* Just to prevent compiler warnings. */\r
 129         ( void ) pvParameters;\r
 130 \r
 131         /* Perform the initialisation necessary before CyaSSL can be used. */\r
 132         prvInitialiseCyaSSL();\r
 133         configASSERT( xCyaSSL_ServerContext );\r
 134 \r
 135         /* Attempt to open the socket. */\r
 136         xListeningSocket = prvOpenServerSocket();\r
 137 \r
 138         /* Now the server socket has been created and the CyaSSL library has been\r
 139         initialised, the task that implements the client side can be created. */\r
 140         xTaskCreate( vSecureTCPClientTask, "Client", configMINIMAL_STACK_SIZE, NULL, sstSECURE_CLIENT_TASK_PRIORITY, NULL );\r
 141 \r
 142         if( xListeningSocket != INVALID_SOCKET )\r
 143         {\r
 144                 for( ;; )\r
 145                 {\r
 146                         /* Wait until the client connects. */\r
 147                         printf( "Waiting for new connection\r\n" );\r
 148                         xConnectedSocket = accept( xListeningSocket, ( struct sockaddr * ) &xClient, &xClientAddressLength );\r
 149 \r
 150                         if( xConnectedSocket != INVALID_SOCKET )\r
 151                         {\r
 152                                 printf( "Connection established\r\n" );\r
 153 \r
 154                                 /* A connection has been accepted by the server.  Create a \r
 155                                 CyaSSL object for use with the newly connected socket. */\r
 156                                 xCyaSSL_Object = NULL;\r
 157                                 xCyaSSL_Object = CyaSSL_new( xCyaSSL_ServerContext );\r
 158     \r
 159                                 if( xCyaSSL_Object != NULL )\r
 160                                 {\r
 161                                         /* Associate the created CyaSSL object with the connected \r
 162                                         socket. */\r
 163                                         xReturned = CyaSSL_set_fd( xCyaSSL_Object, xConnectedSocket );\r
 164                                         configASSERT( xReturned == SSL_SUCCESS );\r
 165 \r
 166                                         do\r
 167                                         {\r
 168                                                 /* The next line is the secure equivalent to the \r
 169                                                 standard sockets call:\r
 170                                                 lBytes = recv( xConnectedSocket, cReceivedString, 50, 0 ); */\r
 171                                                 lBytes = CyaSSL_read( xCyaSSL_Object, cReceivedString, sizeof( cReceivedString ) );\r
 172                                                 \r
 173                                                 /* Print the received characters. */\r
 174                                                 if( lBytes > 0 )\r
 175                                                 {\r
 176                                                         printf( "Received by the secure server: %s\r\n", cReceivedString );\r
 177                                                 }\r
 178 \r
 179                                         } while ( lBytes > 0 );\r
 180 \r
 181                                         /* The connection was closed, close the socket and free the\r
 182                                         CyaSSL object. */\r
 183                                         closesocket( xConnectedSocket );                                        \r
 184                                         CyaSSL_free( xCyaSSL_Object );\r
 185                                         printf( "Connection closed, back to start\r\n\r\n" );\r
 186                                 }                                                               \r
 187                         }\r
 188                 } \r
 189         }\r
 190         else\r
 191         {\r
 192                 /* The socket could not be opened. */\r
 193                 vTaskDelete( NULL );\r
 194         }\r
 195 }\r
 196 /*-----------------------------------------------------------*/\r
 197 \r
 198 static SOCKET prvOpenServerSocket( void )\r
 199 {\r
 200 WSADATA xWSAData;\r
 201 WORD wVersionRequested;\r
 202 struct sockaddr_in xConnection;\r
 203 SOCKET xSocket = INVALID_SOCKET;\r
 204 \r
 205         wVersionRequested = MAKEWORD( 2, 2 );\r
 206 \r
 207         /* Prepare to use WinSock. */\r
 208         if( WSAStartup( wVersionRequested, &xWSAData ) != 0 )\r
 209         {\r
 210                 fprintf( stderr, "Could not open Windows connection.\n" );\r
 211         }\r
 212         else\r
 213         {\r
 214                 xSocket = socket( AF_INET, SOCK_STREAM, 0 );\r
 215                 if( xSocket == INVALID_SOCKET)\r
 216                 {\r
 217                         fprintf( stderr, "Could not create socket.\n" );\r
 218                         WSACleanup();\r
 219                 }\r
 220                 else\r
 221                 {\r
 222                         /* Zero out the server structure. */\r
 223                         memset( ( void * ) &xConnection, 0x00, sizeof( struct sockaddr_in ) );\r
 224 \r
 225                         xConnection.sin_family = AF_INET;\r
 226                         xConnection.sin_addr.s_addr = inet_addr("127.0.0.1");\r
 227                         xConnection.sin_port = htons( configTCP_PORT_NUMBER );\r
 228 \r
 229                         /* Bind the address to the socket. */\r
 230                         if( bind( xSocket, ( struct sockaddr * ) &xConnection, sizeof( struct sockaddr_in ) ) == -1 )\r
 231                         {\r
 232                                 fprintf( stderr, "Could not socket to port %d.\n", configTCP_PORT_NUMBER );\r
 233                                 closesocket( xSocket );\r
 234                                 xSocket = INVALID_SOCKET;\r
 235                                 WSACleanup();\r
 236                         }\r
 237 \r
 238                         if( listen( xSocket, 20 ) != 0 )\r
 239                         {\r
 240                                 closesocket( xSocket );\r
 241                                 xSocket = INVALID_SOCKET;\r
 242                                 WSACleanup();\r
 243                         }\r
 244                 }\r
 245         }\r
 246 \r
 247         return xSocket;\r
 248 }\r
 249 /*-----------------------------------------------------------*/\r
 250 \r
 251 static void prvInitialiseCyaSSL( void )\r
 252 {\r
 253 int32_t iReturn;\r
 254 \r
 255         #ifdef DEBUG_CYASSL\r
 256         {\r
 257                 CyaSSL_Debugging_ON();\r
 258         }\r
 259         #endif\r
 260 \r
 261     /* Initialise CyaSSL.  This must be done before any other CyaSSL functions\r
 262     are called. */\r
 263     CyaSSL_Init();\r
 264 \r
 265     /* Attempt to create a context that uses the TLS V1 server protocol. */\r
 266     xCyaSSL_ServerContext = CyaSSL_CTX_new( CyaTLSv1_server_method() );\r
 267 \r
 268     if( xCyaSSL_ServerContext != NULL )\r
 269     {\r
 270         /* Load the CA certificate.  Real applications should ensure that\r
 271         CyaSSL_CTX_load_verify_locations() returns SSL_SUCCESS before \r
 272                 proceeding. */\r
 273         iReturn = CyaSSL_CTX_load_verify_locations( xCyaSSL_ServerContext, "ca-cert.pem", 0 );\r
 274                 configASSERT( iReturn == SSL_SUCCESS );\r
 275 \r
 276                 iReturn = CyaSSL_CTX_use_certificate_file( xCyaSSL_ServerContext, "server-cert.pem", SSL_FILETYPE_PEM );\r
 277                 configASSERT( iReturn == SSL_SUCCESS );\r
 278 \r
 279                 iReturn = CyaSSL_CTX_use_PrivateKey_file( xCyaSSL_ServerContext, "server-key.pem", SSL_FILETYPE_PEM );\r
 280                 configASSERT( iReturn == SSL_SUCCESS );\r
 281     }\r
 282 }\r
 283 \r
 284 \r