tests/pskself.c

   1 /*
   2  * Copyright (C) 2004, 2005 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 #if 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 "utils.h"
  41
  42 /* A very basic TLS client, with PSK authentication.
  43  */
  44
  45 #define MAX_BUF 1024
  46 #define MSG "Hello TLS"
  47
  48 /* Connects to the peer and returns a socket
  49  * descriptor.
  50  */
  51 int
  52 tcp_connect (void)
  53 {
  54   const char *PORT = "5556";
  55   const char *SERVER = "127.0.0.1";
  56   int err, sd;
  57   struct sockaddr_in sa;
  58
  59   /* connects to server
  60    */
  61   sd = socket (AF_INET, SOCK_STREAM, 0);
  62
  63   memset (&sa, '\0', sizeof (sa));
  64   sa.sin_family = AF_INET;
  65   sa.sin_port = htons (atoi (PORT));
  66   inet_pton (AF_INET, SERVER, &sa.sin_addr);
  67
  68   err = connect (sd, (struct sockaddr *) &sa, sizeof (sa));
  69   if (err < 0)
  70     {
  71       fprintf (stderr, "Connect error\n");
  72       exit (1);
  73     }
  74
  75   return sd;
  76 }
  77
  78 /* closes the given socket descriptor.
  79  */
  80 void
  81 tcp_close (int sd)
  82 {
  83   shutdown (sd, SHUT_RDWR);     /* no more receptions */
  84   close (sd);
  85 }
  86
  87 void
  88 client (void)
  89 {
  90   int ret, sd, ii;
  91   gnutls_session_t session;
  92   char buffer[MAX_BUF + 1];
  93   gnutls_psk_client_credentials_t pskcred;
  94   /* Need to enable anonymous KX specifically. */
  95   const int kx_prio[] = { GNUTLS_KX_PSK, 0 };
  96   const gnutls_datum_t key = { "DEADBEEF", 8 };
  97
  98   gnutls_global_init ();
  99
 100   gnutls_psk_allocate_client_credentials (&pskcred);
 101   gnutls_psk_set_client_credentials (pskcred, "test", &key,
 102                                      GNUTLS_PSK_KEY_HEX);
 103
 104   /* Initialize TLS session
 105    */
 106   gnutls_init (&session, GNUTLS_CLIENT);
 107
 108   /* Use default priorities */
 109   gnutls_set_default_priority (session);
 110   gnutls_kx_set_priority (session, kx_prio);
 111
 112   /* put the anonymous credentials to the current session
 113    */
 114   gnutls_credentials_set (session, GNUTLS_CRD_PSK, pskcred);
 115
 116   /* connect to the peer
 117    */
 118   sd = tcp_connect ();
 119
 120   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 121
 122   /* Perform the TLS handshake
 123    */
 124   ret = gnutls_handshake (session);
 125
 126   if (ret < 0)
 127     {
 128       fail ("client: Handshake failed\n");
 129       gnutls_perror (ret);
 130       goto end;
 131     }
 132   else
 133     {
 134       success ("client: Handshake was completed\n");
 135     }
 136
 137   gnutls_record_send (session, MSG, strlen (MSG));
 138
 139   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 140   if (ret == 0)
 141     {
 142       success ("client: Peer has closed the TLS connection\n");
 143       goto end;
 144     }
 145   else if (ret < 0)
 146     {
 147       fail ("client: Error: %s\n", gnutls_strerror (ret));
 148       goto end;
 149     }
 150
 151   if (debug)
 152     {
 153       printf ("- Received %d bytes: ", ret);
 154       for (ii = 0; ii < ret; ii++)
 155         {
 156           fputc (buffer[ii], stdout);
 157         }
 158       fputs ("\n", stdout);
 159     }
 160
 161   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 162
 163 end:
 164
 165   tcp_close (sd);
 166
 167   gnutls_deinit (session);
 168
 169   gnutls_psk_free_client_credentials (pskcred);
 170
 171   gnutls_global_deinit ();
 172 }
 173
 174 /* This is a sample TLS 1.0 echo server, for PSK authentication.
 175  */
 176
 177 #define SA struct sockaddr
 178 #define MAX_BUF 1024
 179 #define PORT 5556               /* listen to 5556 port */
 180
 181 /* These are global */
 182 gnutls_psk_server_credentials_t server_pskcred;
 183
 184 gnutls_session_t
 185 initialize_tls_session (void)
 186 {
 187   gnutls_session_t session;
 188   const int kx_prio[] = { GNUTLS_KX_PSK, 0 };
 189
 190   gnutls_init (&session, GNUTLS_SERVER);
 191
 192   /* avoid calling all the priority functions, since the defaults
 193    * are adequate.
 194    */
 195   gnutls_set_default_priority (session);
 196   gnutls_kx_set_priority (session, kx_prio);
 197
 198   gnutls_credentials_set (session, GNUTLS_CRD_PSK, server_pskcred);
 199
 200   return session;
 201 }
 202
 203 static int
 204 pskfunc (gnutls_session_t session, const char *username, gnutls_datum_t * key)
 205 {
 206   printf ("psk: username %s\n", username);
 207   key->data = gnutls_malloc (4);
 208   key->data[0] = 0xDE;
 209   key->data[1] = 0xAD;
 210   key->data[2] = 0xBE;
 211   key->data[3] = 0xEF;
 212   key->size = 4;
 213   return 0;
 214 }
 215
 216 int err, listen_sd, i;
 217 int sd, ret;
 218 struct sockaddr_in sa_serv;
 219 struct sockaddr_in sa_cli;
 220 int client_len;
 221 char topbuf[512];
 222 gnutls_session_t session;
 223 char buffer[MAX_BUF + 1];
 224 int optval = 1;
 225
 226 void
 227 server_start (void)
 228 {
 229   /* this must be called once in the program
 230    */
 231   gnutls_global_init ();
 232
 233   gnutls_psk_allocate_server_credentials (&server_pskcred);
 234   gnutls_psk_set_server_credentials_function (server_pskcred, pskfunc);
 235
 236   success ("Launched...\n");
 237
 238   /* Socket operations
 239    */
 240   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 241   if (err == -1)
 242     {
 243       perror ("socket");
 244       fail ("server: socket failed\n");
 245       return;
 246     }
 247
 248   memset (&sa_serv, '\0', sizeof (sa_serv));
 249   sa_serv.sin_family = AF_INET;
 250   sa_serv.sin_addr.s_addr = INADDR_ANY;
 251   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 252
 253   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof (int));
 254
 255   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 256   if (err == -1)
 257     {
 258       perror ("bind");
 259       fail ("server: bind failed\n");
 260       return;
 261     }
 262
 263   err = listen (listen_sd, 1024);
 264   if (err == -1)
 265     {
 266       perror ("listen");
 267       fail ("server: listen failed\n");
 268       return;
 269     }
 270
 271   success ("server: ready. Listening to port '%d'.\n", PORT);
 272 }
 273
 274 void
 275 server (void)
 276 {
 277   client_len = sizeof (sa_cli);
 278
 279   session = initialize_tls_session ();
 280
 281   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 282
 283   success ("server: connection from %s, port %d\n",
 284            inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 285                       sizeof (topbuf)), ntohs (sa_cli.sin_port));
 286
 287   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 288   ret = gnutls_handshake (session);
 289   if (ret < 0)
 290     {
 291       close (sd);
 292       gnutls_deinit (session);
 293       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 294       return;
 295     }
 296   success ("server: Handshake was completed\n");
 297
 298   /* see the Getting peer's information example */
 299   /* print_info(session); */
 300
 301   i = 0;
 302   for (;;)
 303     {
 304       bzero (buffer, MAX_BUF + 1);
 305       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 306
 307       if (ret == 0)
 308         {
 309           success ("server: Peer has closed the GNUTLS connection\n");
 310           break;
 311         }
 312       else if (ret < 0)
 313         {
 314           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 315           break;
 316         }
 317       else if (ret > 0)
 318         {
 319           /* echo data back to the client
 320            */
 321           gnutls_record_send (session, buffer, strlen (buffer));
 322         }
 323     }
 324   /* do not wait for the peer to close the connection.
 325    */
 326   gnutls_bye (session, GNUTLS_SHUT_WR);
 327
 328   close (sd);
 329   gnutls_deinit (session);
 330
 331   close (listen_sd);
 332
 333   gnutls_psk_free_server_credentials (server_pskcred);
 334
 335   gnutls_global_deinit ();
 336
 337   success ("server: finished\n");
 338 }
 339
 340 void
 341 doit (void)
 342 {
 343   pid_t child;
 344
 345   server_start ();
 346   if (error_count)
 347     return;
 348
 349   child = fork ();
 350   if (child < 0)
 351     {
 352       perror ("fork");
 353       fail ("fork");
 354       return;
 355     }
 356
 357   if (child)
 358     {
 359       int status;
 360       /* parent */
 361       server ();
 362       wait (&status);
 363     }
 364   else
 365     client ();
 366 }