tests/pskself.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2008 Free Software Foundation
   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 #include <sys/wait.h>
  35 #include <netinet/in.h>
  36 #include <arpa/inet.h>
  37 #include <unistd.h>
  38 #include <gnutls/gnutls.h>
  39
  40 #include "tcp.c"
  41
  42 #include "utils.h"
  43
  44 /* A very basic TLS client, with PSK authentication.
  45  */
  46
  47 #define MAX_BUF 1024
  48 #define MSG "Hello TLS"
  49
  50 static void
  51 client (void)
  52 {
  53   int ret, sd, ii;
  54   gnutls_session_t session;
  55   char buffer[MAX_BUF + 1];
  56   gnutls_psk_client_credentials_t pskcred;
  57   /* Need to enable anonymous KX specifically. */
  58   const int kx_prio[] = { GNUTLS_KX_PSK, 0 };
  59   const gnutls_datum_t key = { (char*) "DEADBEEF", 8 };
  60
  61   gnutls_global_init ();
  62
  63   gnutls_psk_allocate_client_credentials (&pskcred);
  64   gnutls_psk_set_client_credentials (pskcred, "test", &key,
  65                                      GNUTLS_PSK_KEY_HEX);
  66
  67   /* Initialize TLS session
  68    */
  69   gnutls_init (&session, GNUTLS_CLIENT);
  70
  71   /* Use default priorities */
  72   gnutls_set_default_priority (session);
  73   gnutls_kx_set_priority (session, kx_prio);
  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       success ("client: Handshake was completed\n");
  98     }
  99
 100   gnutls_record_send (session, MSG, strlen (MSG));
 101
 102   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 103   if (ret == 0)
 104     {
 105       success ("client: Peer has closed the TLS connection\n");
 106       goto end;
 107     }
 108   else if (ret < 0)
 109     {
 110       fail ("client: Error: %s\n", gnutls_strerror (ret));
 111       goto end;
 112     }
 113
 114   if (debug)
 115     {
 116       printf ("- Received %d bytes: ", ret);
 117       for (ii = 0; ii < ret; ii++)
 118         {
 119           fputc (buffer[ii], stdout);
 120         }
 121       fputs ("\n", stdout);
 122     }
 123
 124   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 125
 126 end:
 127
 128   tcp_close (sd);
 129
 130   gnutls_deinit (session);
 131
 132   gnutls_psk_free_client_credentials (pskcred);
 133
 134   gnutls_global_deinit ();
 135 }
 136
 137 /* This is a sample TLS 1.0 echo server, for PSK authentication.
 138  */
 139
 140 #define SA struct sockaddr
 141 #define MAX_BUF 1024
 142 #define PORT 5556               /* listen to 5556 port */
 143
 144 /* These are global */
 145 gnutls_psk_server_credentials_t server_pskcred;
 146
 147 static gnutls_session_t
 148 initialize_tls_session (void)
 149 {
 150   gnutls_session_t session;
 151   const int kx_prio[] = { GNUTLS_KX_PSK, 0 };
 152
 153   gnutls_init (&session, GNUTLS_SERVER);
 154
 155   /* avoid calling all the priority functions, since the defaults
 156    * are adequate.
 157    */
 158   gnutls_set_default_priority (session);
 159   gnutls_kx_set_priority (session, kx_prio);
 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   printf ("psk: username %s\n", username);
 170   key->data = gnutls_malloc (4);
 171   key->data[0] = 0xDE;
 172   key->data[1] = 0xAD;
 173   key->data[2] = 0xBE;
 174   key->data[3] = 0xEF;
 175   key->size = 4;
 176   return 0;
 177 }
 178
 179 int err, listen_sd, i;
 180 int sd, ret;
 181 struct sockaddr_in sa_serv;
 182 struct sockaddr_in sa_cli;
 183 int client_len;
 184 char topbuf[512];
 185 gnutls_session_t session;
 186 char buffer[MAX_BUF + 1];
 187 int optval = 1;
 188
 189 static void
 190 server_start (void)
 191 {
 192   success ("Launched...\n");
 193
 194   /* Socket operations
 195    */
 196   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 197   if (err == -1)
 198     {
 199       perror ("socket");
 200       fail ("server: socket failed\n");
 201       return;
 202     }
 203
 204   memset (&sa_serv, '\0', sizeof (sa_serv));
 205   sa_serv.sin_family = AF_INET;
 206   sa_serv.sin_addr.s_addr = INADDR_ANY;
 207   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 208
 209   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval, sizeof (int));
 210
 211   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 212   if (err == -1)
 213     {
 214       perror ("bind");
 215       fail ("server: bind failed\n");
 216       return;
 217     }
 218
 219   err = listen (listen_sd, 1024);
 220   if (err == -1)
 221     {
 222       perror ("listen");
 223       fail ("server: listen failed\n");
 224       return;
 225     }
 226
 227   success ("server: ready. Listening to port '%d'.\n", PORT);
 228 }
 229
 230 static void
 231 server (void)
 232 {
 233   /* this must be called once in the program
 234    */
 235   gnutls_global_init ();
 236
 237   gnutls_psk_allocate_server_credentials (&server_pskcred);
 238   gnutls_psk_set_server_credentials_function (server_pskcred, pskfunc);
 239
 240   client_len = sizeof (sa_cli);
 241
 242   session = initialize_tls_session ();
 243
 244   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 245
 246   success ("server: connection from %s, port %d\n",
 247            inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 248                       sizeof (topbuf)), ntohs (sa_cli.sin_port));
 249
 250   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 251   ret = gnutls_handshake (session);
 252   if (ret < 0)
 253     {
 254       close (sd);
 255       gnutls_deinit (session);
 256       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 257       return;
 258     }
 259   success ("server: Handshake was completed\n");
 260
 261   /* see the Getting peer's information example */
 262   /* print_info(session); */
 263
 264   i = 0;
 265   for (;;)
 266     {
 267       memset (buffer, 0, MAX_BUF + 1);
 268       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 269
 270       if (ret == 0)
 271         {
 272           success ("server: Peer has closed the GNUTLS connection\n");
 273           break;
 274         }
 275       else if (ret < 0)
 276         {
 277           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 278           break;
 279         }
 280       else if (ret > 0)
 281         {
 282           /* echo data back to the client
 283            */
 284           gnutls_record_send (session, buffer, strlen (buffer));
 285         }
 286     }
 287   /* do not wait for the peer to close the connection.
 288    */
 289   gnutls_bye (session, GNUTLS_SHUT_WR);
 290
 291   close (sd);
 292   gnutls_deinit (session);
 293
 294   close (listen_sd);
 295
 296   gnutls_psk_free_server_credentials (server_pskcred);
 297
 298   gnutls_global_deinit ();
 299
 300   success ("server: finished\n");
 301 }
 302
 303 void
 304 doit (void)
 305 {
 306   pid_t child;
 307
 308   server_start ();
 309   if (error_count)
 310     return;
 311
 312   child = fork ();
 313   if (child < 0)
 314     {
 315       perror ("fork");
 316       fail ("fork");
 317       return;
 318     }
 319
 320   if (child)
 321     {
 322       int status;
 323       /* parent */
 324       server ();
 325       wait (&status);
 326     }
 327   else
 328     client ();
 329 }