tests/pskself.c

   1 /*
   2  * Copyright (C) 2004-2012 Free Software Foundation, Inc.
   3  *
   4  * Author: Simon Josefsson
   5  *
   6  * This file is part of GnuTLS.
   7  *
   8  * GnuTLS is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * GnuTLS is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with GnuTLS; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 /* Parts copied from GnuTLS example programs. */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <sys/types.h>
  33 #include <sys/socket.h>
  34 #if !defined(_WIN32)
  35 #include <sys/wait.h>
  36 #include <netinet/in.h>
  37 #include <arpa/inet.h>
  38 #endif
  39 #include <unistd.h>
  40 #include <gnutls/gnutls.h>
  41
  42 #include "tcp.c"
  43
  44 #include "utils.h"
  45
  46 /* A very basic TLS client, with PSK authentication.
  47  */
  48
  49 const char* side = "";
  50
  51 static void
  52 tls_log_func (int level, const char *str)
  53 {
  54   fprintf (stderr, "%s|<%d>| %s", side, level, str);
  55 }
  56
  57 #define MAX_BUF 1024
  58 #define MSG "Hello TLS"
  59
  60 static void
  61 client (void)
  62 {
  63   int ret, sd, ii;
  64   gnutls_session_t session;
  65   char buffer[MAX_BUF + 1];
  66   gnutls_psk_client_credentials_t pskcred;
  67   /* Need to enable anonymous KX specifically. */
  68   const gnutls_datum_t key = { (void *) "DEADBEEF", 8 };
  69
  70   gnutls_global_init ();
  71   gnutls_global_set_log_function (tls_log_func);
  72   if (debug)
  73     gnutls_global_set_log_level (4711);
  74
  75   side = "client";
  76
  77   gnutls_psk_allocate_client_credentials (&pskcred);
  78   gnutls_psk_set_client_credentials (pskcred, "test", &key,
  79                                      GNUTLS_PSK_KEY_HEX);
  80
  81   /* Initialize TLS session
  82    */
  83   gnutls_init (&session, GNUTLS_CLIENT);
  84
  85   /* Use default priorities */
  86   gnutls_priority_set_direct (session, "NORMAL:+PSK", NULL);
  87
  88   /* put the anonymous credentials to the current session
  89    */
  90   gnutls_credentials_set (session, GNUTLS_CRD_PSK, pskcred);
  91
  92   /* connect to the peer
  93    */
  94   sd = tcp_connect ();
  95
  96   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
  97
  98   /* Perform the TLS handshake
  99    */
 100   ret = gnutls_handshake (session);
 101
 102   if (ret < 0)
 103     {
 104       fail ("client: Handshake failed\n");
 105       gnutls_perror (ret);
 106       goto end;
 107     }
 108   else
 109     {
 110       if (debug)
 111         success ("client: Handshake was completed\n");
 112     }
 113
 114   gnutls_record_send (session, MSG, strlen (MSG));
 115
 116   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 117   if (ret == 0)
 118     {
 119       if (debug)
 120         success ("client: Peer has closed the TLS connection\n");
 121       goto end;
 122     }
 123   else if (ret < 0)
 124     {
 125       fail ("client: Error: %s\n", gnutls_strerror (ret));
 126       goto end;
 127     }
 128
 129   if (debug)
 130     {
 131       printf ("- Received %d bytes: ", ret);
 132       for (ii = 0; ii < ret; ii++)
 133         {
 134           fputc (buffer[ii], stdout);
 135         }
 136       fputs ("\n", stdout);
 137     }
 138
 139   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 140
 141 end:
 142
 143   tcp_close (sd);
 144
 145   gnutls_deinit (session);
 146
 147   gnutls_psk_free_client_credentials (pskcred);
 148
 149   gnutls_global_deinit ();
 150 }
 151
 152 /* This is a sample TLS 1.0 echo server, for PSK authentication.
 153  */
 154
 155 #define SA struct sockaddr
 156 #define MAX_BUF 1024
 157 #define PORT 5556               /* listen to 5556 port */
 158
 159 /* These are global */
 160 gnutls_psk_server_credentials_t server_pskcred;
 161
 162 static gnutls_session_t
 163 initialize_tls_session (void)
 164 {
 165   gnutls_session_t session;
 166
 167   gnutls_init (&session, GNUTLS_SERVER);
 168
 169   /* avoid calling all the priority functions, since the defaults
 170    * are adequate.
 171    */
 172   gnutls_priority_set_direct (session, "NORMAL:+PSK", NULL);
 173
 174   gnutls_credentials_set (session, GNUTLS_CRD_PSK, server_pskcred);
 175
 176   return session;
 177 }
 178
 179 static int
 180 pskfunc (gnutls_session_t session, const char *username, gnutls_datum_t * key)
 181 {
 182   if (debug)
 183     printf ("psk: username %s\n", username);
 184   key->data = gnutls_malloc (4);
 185   key->data[0] = 0xDE;
 186   key->data[1] = 0xAD;
 187   key->data[2] = 0xBE;
 188   key->data[3] = 0xEF;
 189   key->size = 4;
 190   return 0;
 191 }
 192
 193 int err, listen_sd, i;
 194 int sd, ret;
 195 struct sockaddr_in sa_serv;
 196 struct sockaddr_in sa_cli;
 197 socklen_t client_len;
 198 char topbuf[512];
 199 gnutls_session_t session;
 200 char buffer[MAX_BUF + 1];
 201 int optval = 1;
 202
 203 static void
 204 server_start (void)
 205 {
 206   if (debug)
 207     success ("Launched...\n");
 208
 209   /* Socket operations
 210    */
 211   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 212   if (err == -1)
 213     {
 214       perror ("socket");
 215       fail ("server: socket failed\n");
 216       return;
 217     }
 218
 219   memset (&sa_serv, '\0', sizeof (sa_serv));
 220   sa_serv.sin_family = AF_INET;
 221   sa_serv.sin_addr.s_addr = INADDR_ANY;
 222   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 223
 224   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval,
 225               sizeof (int));
 226
 227   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 228   if (err == -1)
 229     {
 230       perror ("bind");
 231       fail ("server: bind failed\n");
 232       return;
 233     }
 234
 235   err = listen (listen_sd, 1024);
 236   if (err == -1)
 237     {
 238       perror ("listen");
 239       fail ("server: listen failed\n");
 240       return;
 241     }
 242
 243   if (debug)
 244     success ("server: ready. Listening to port '%d'.\n", PORT);
 245 }
 246
 247 static void
 248 server (void)
 249 {
 250   /* this must be called once in the program
 251    */
 252   gnutls_global_init ();
 253   gnutls_global_set_log_function (tls_log_func);
 254   if (debug)
 255     gnutls_global_set_log_level (4711);
 256
 257   side = "server";
 258
 259   gnutls_psk_allocate_server_credentials (&server_pskcred);
 260   gnutls_psk_set_server_credentials_function (server_pskcred, pskfunc);
 261
 262   client_len = sizeof (sa_cli);
 263
 264   session = initialize_tls_session ();
 265
 266   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 267
 268   if (debug)
 269     success ("server: connection from %s, port %d\n",
 270              inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 271                         sizeof (topbuf)), ntohs (sa_cli.sin_port));
 272
 273   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 274   ret = gnutls_handshake (session);
 275   if (ret < 0)
 276     {
 277       close (sd);
 278       gnutls_deinit (session);
 279       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 280       return;
 281     }
 282   if (debug)
 283     success ("server: Handshake was completed\n");
 284
 285   /* see the Getting peer's information example */
 286   /* print_info(session); */
 287
 288   i = 0;
 289   for (;;)
 290     {
 291       memset (buffer, 0, MAX_BUF + 1);
 292       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 293
 294       if (ret == 0)
 295         {
 296           if (debug)
 297             success ("server: Peer has closed the GnuTLS connection\n");
 298           break;
 299         }
 300       else if (ret < 0)
 301         {
 302           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 303           break;
 304         }
 305       else if (ret > 0)
 306         {
 307           /* echo data back to the client
 308            */
 309           gnutls_record_send (session, buffer, strlen (buffer));
 310         }
 311     }
 312   /* do not wait for the peer to close the connection.
 313    */
 314   gnutls_bye (session, GNUTLS_SHUT_WR);
 315
 316   close (sd);
 317   gnutls_deinit (session);
 318
 319   close (listen_sd);
 320
 321   gnutls_psk_free_server_credentials (server_pskcred);
 322
 323   gnutls_global_deinit ();
 324
 325   if (debug)
 326     success ("server: finished\n");
 327 }
 328
 329 void
 330 doit (void)
 331 {
 332   pid_t child;
 333
 334   server_start ();
 335   if (error_count)
 336     return;
 337
 338   child = fork ();
 339   if (child < 0)
 340     {
 341       perror ("fork");
 342       fail ("fork");
 343       return;
 344     }
 345
 346   if (child)
 347     {
 348       int status;
 349       /* parent */
 350       server ();
 351       wait (&status);
 352     }
 353   else
 354     client ();
 355 }