tests/pskself.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2008, 2010 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 #if !defined(_WIN32)
  34 #include <sys/socket.h>
  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 #define MAX_BUF 1024
  50 #define MSG "Hello TLS"
  51
  52 static void
  53 client (void)
  54 {
  55   int ret, sd, ii;
  56   gnutls_session_t session;
  57   char buffer[MAX_BUF + 1];
  58   gnutls_psk_client_credentials_t pskcred;
  59   /* Need to enable anonymous KX specifically. */
  60   const gnutls_datum_t key = { (char *) "DEADBEEF", 8 };
  61
  62   gnutls_global_init ();
  63
  64   gnutls_psk_allocate_client_credentials (&pskcred);
  65   gnutls_psk_set_client_credentials (pskcred, "test", &key,
  66                                      GNUTLS_PSK_KEY_HEX);
  67
  68   /* Initialize TLS session
  69    */
  70   gnutls_init (&session, GNUTLS_CLIENT);
  71
  72   /* Use default priorities */
  73   gnutls_priority_set_direct (session, "NORMAL:+PSK", NULL);
  74
  75   /* put the anonymous credentials to the current session
  76    */
  77   gnutls_credentials_set (session, GNUTLS_CRD_PSK, pskcred);
  78
  79   /* connect to the peer
  80    */
  81   sd = tcp_connect ();
  82
  83   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
  84
  85   /* Perform the TLS handshake
  86    */
  87   ret = gnutls_handshake (session);
  88
  89   if (ret < 0)
  90     {
  91       fail ("client: Handshake failed\n");
  92       gnutls_perror (ret);
  93       goto end;
  94     }
  95   else
  96     {
  97       if (debug)
  98         success ("client: Handshake was completed\n");
  99     }
 100
 101   gnutls_record_send (session, MSG, strlen (MSG));
 102
 103   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 104   if (ret == 0)
 105     {
 106       if (debug)
 107         success ("client: Peer has closed the TLS connection\n");
 108       goto end;
 109     }
 110   else if (ret < 0)
 111     {
 112       fail ("client: Error: %s\n", gnutls_strerror (ret));
 113       goto end;
 114     }
 115
 116   if (debug)
 117     {
 118       printf ("- Received %d bytes: ", ret);
 119       for (ii = 0; ii < ret; ii++)
 120         {
 121           fputc (buffer[ii], stdout);
 122         }
 123       fputs ("\n", stdout);
 124     }
 125
 126   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 127
 128 end:
 129
 130   tcp_close (sd);
 131
 132   gnutls_deinit (session);
 133
 134   gnutls_psk_free_client_credentials (pskcred);
 135
 136   gnutls_global_deinit ();
 137 }
 138
 139 /* This is a sample TLS 1.0 echo server, for PSK authentication.
 140  */
 141
 142 #define SA struct sockaddr
 143 #define MAX_BUF 1024
 144 #define PORT 5556               /* listen to 5556 port */
 145
 146 /* These are global */
 147 gnutls_psk_server_credentials_t server_pskcred;
 148
 149 static gnutls_session_t
 150 initialize_tls_session (void)
 151 {
 152   gnutls_session_t session;
 153
 154   gnutls_init (&session, GNUTLS_SERVER);
 155
 156   /* avoid calling all the priority functions, since the defaults
 157    * are adequate.
 158    */
 159   gnutls_priority_set_direct (session, "NORMAL:+PSK", NULL);
 160
 161   gnutls_credentials_set (session, GNUTLS_CRD_PSK, server_pskcred);
 162
 163   return session;
 164 }
 165
 166 static int
 167 pskfunc (gnutls_session_t session, const char *username, gnutls_datum_t * key)
 168 {
 169   if (debug)
 170     printf ("psk: username %s\n", username);
 171   key->data = gnutls_malloc (4);
 172   key->data[0] = 0xDE;
 173   key->data[1] = 0xAD;
 174   key->data[2] = 0xBE;
 175   key->data[3] = 0xEF;
 176   key->size = 4;
 177   return 0;
 178 }
 179
 180 int err, listen_sd, i;
 181 int sd, ret;
 182 struct sockaddr_in sa_serv;
 183 struct sockaddr_in sa_cli;
 184 int client_len;
 185 char topbuf[512];
 186 gnutls_session_t session;
 187 char buffer[MAX_BUF + 1];
 188 int optval = 1;
 189
 190 static void
 191 server_start (void)
 192 {
 193   if (debug)
 194     success ("Launched...\n");
 195
 196   /* Socket operations
 197    */
 198   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 199   if (err == -1)
 200     {
 201       perror ("socket");
 202       fail ("server: socket failed\n");
 203       return;
 204     }
 205
 206   memset (&sa_serv, '\0', sizeof (sa_serv));
 207   sa_serv.sin_family = AF_INET;
 208   sa_serv.sin_addr.s_addr = INADDR_ANY;
 209   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 210
 211   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval,
 212               sizeof (int));
 213
 214   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 215   if (err == -1)
 216     {
 217       perror ("bind");
 218       fail ("server: bind failed\n");
 219       return;
 220     }
 221
 222   err = listen (listen_sd, 1024);
 223   if (err == -1)
 224     {
 225       perror ("listen");
 226       fail ("server: listen failed\n");
 227       return;
 228     }
 229
 230   if (debug)
 231     success ("server: ready. Listening to port '%d'.\n", PORT);
 232 }
 233
 234 static void
 235 server (void)
 236 {
 237   /* this must be called once in the program
 238    */
 239   gnutls_global_init ();
 240
 241   gnutls_psk_allocate_server_credentials (&server_pskcred);
 242   gnutls_psk_set_server_credentials_function (server_pskcred, pskfunc);
 243
 244   client_len = sizeof (sa_cli);
 245
 246   session = initialize_tls_session ();
 247
 248   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 249
 250   if (debug)
 251     success ("server: connection from %s, port %d\n",
 252              inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 253                         sizeof (topbuf)), ntohs (sa_cli.sin_port));
 254
 255   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 256   ret = gnutls_handshake (session);
 257   if (ret < 0)
 258     {
 259       close (sd);
 260       gnutls_deinit (session);
 261       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 262       return;
 263     }
 264   if (debug)
 265     success ("server: Handshake was completed\n");
 266
 267   /* see the Getting peer's information example */
 268   /* print_info(session); */
 269
 270   i = 0;
 271   for (;;)
 272     {
 273       memset (buffer, 0, MAX_BUF + 1);
 274       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 275
 276       if (ret == 0)
 277         {
 278           if (debug)
 279             success ("server: Peer has closed the GnuTLS connection\n");
 280           break;
 281         }
 282       else if (ret < 0)
 283         {
 284           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 285           break;
 286         }
 287       else if (ret > 0)
 288         {
 289           /* echo data back to the client
 290            */
 291           gnutls_record_send (session, buffer, strlen (buffer));
 292         }
 293     }
 294   /* do not wait for the peer to close the connection.
 295    */
 296   gnutls_bye (session, GNUTLS_SHUT_WR);
 297
 298   close (sd);
 299   gnutls_deinit (session);
 300
 301   close (listen_sd);
 302
 303   gnutls_psk_free_server_credentials (server_pskcred);
 304
 305   gnutls_global_deinit ();
 306
 307   if (debug)
 308     success ("server: finished\n");
 309 }
 310
 311 void
 312 doit (void)
 313 {
 314   pid_t child;
 315
 316   server_start ();
 317   if (error_count)
 318     return;
 319
 320   child = fork ();
 321   if (child < 0)
 322     {
 323       perror ("fork");
 324       fail ("fork");
 325       return;
 326     }
 327
 328   if (child)
 329     {
 330       int status;
 331       /* parent */
 332       server ();
 333       wait (&status);
 334     }
 335   else
 336     client ();
 337 }