tests/dhepskself.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2008, 2009 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 tls_log_func (int level, const char *str)
  52 {
  53   fprintf (stderr, "|<%d>| %s", level, str);
  54 }
  55
  56 static void
  57 client (void)
  58 {
  59   int ret, sd, ii;
  60   gnutls_session_t session;
  61   char buffer[MAX_BUF + 1];
  62   gnutls_psk_client_credentials_t pskcred;
  63   const gnutls_datum_t key = { (char*) "DEADBEEF", 8 };
  64
  65   gnutls_global_init ();
  66
  67   gnutls_global_set_log_function (tls_log_func);
  68 //  gnutls_global_set_log_level (99);
  69
  70   gnutls_psk_allocate_client_credentials (&pskcred);
  71   gnutls_psk_set_client_credentials (pskcred, "test", &key,
  72                                      GNUTLS_PSK_KEY_HEX);
  73
  74   /* Initialize TLS session
  75    */
  76   gnutls_init (&session, GNUTLS_CLIENT);
  77
  78   /* Use default priorities */
  79   gnutls_set_default_priority (session);
  80
  81   /* put the anonymous credentials to the current session
  82    */
  83   gnutls_credentials_set (session, GNUTLS_CRD_PSK, pskcred);
  84
  85   /* connect to the peer
  86    */
  87   sd = tcp_connect ();
  88
  89   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
  90
  91   /* Perform the TLS handshake
  92    */
  93   ret = gnutls_handshake (session);
  94
  95   if (ret < 0)
  96     {
  97       fail ("client: Handshake failed\n");
  98       gnutls_perror (ret);
  99       goto end;
 100     }
 101   else
 102     {
 103       success ("client: Handshake was completed\n");
 104     }
 105
 106   gnutls_record_send (session, MSG, strlen (MSG));
 107
 108   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 109   if (ret == 0)
 110     {
 111       success ("client: Peer has closed the TLS connection\n");
 112       goto end;
 113     }
 114   else if (ret < 0)
 115     {
 116       fail ("client: Error: %s\n", gnutls_strerror (ret));
 117       goto end;
 118     }
 119
 120   printf ("- Received %d bytes: ", ret);
 121   for (ii = 0; ii < ret; ii++)
 122     fputc (buffer[ii], stdout);
 123   fputs ("\n", stdout);
 124
 125   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 126
 127 end:
 128
 129   tcp_close (sd);
 130
 131   gnutls_deinit (session);
 132
 133   gnutls_psk_free_client_credentials (pskcred);
 134
 135   gnutls_global_deinit ();
 136 }
 137
 138 /* This is a sample TLS 1.0 echo server, for PSK authentication.
 139  */
 140
 141 #define SA struct sockaddr
 142 #define MAX_BUF 1024
 143 #define PORT 5556               /* listen to 5556 port */
 144
 145 /* These are global */
 146 gnutls_psk_server_credentials_t server_pskcred;
 147
 148 static gnutls_session_t
 149 initialize_tls_session (void)
 150 {
 151   gnutls_session_t session;
 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
 160   gnutls_credentials_set (session, GNUTLS_CRD_PSK, server_pskcred);
 161
 162   return session;
 163 }
 164
 165 static gnutls_dh_params_t dh_params;
 166
 167 static int
 168 generate_dh_params (void)
 169 {
 170   const gnutls_datum_t p3 = { (char*) pkcs3, strlen (pkcs3) };
 171   /* Generate Diffie-Hellman parameters - for use with DHE
 172    * kx algorithms. These should be discarded and regenerated
 173    * once a day, once a week or once a month. Depending on the
 174    * security requirements.
 175    */
 176   gnutls_dh_params_init (&dh_params);
 177   return gnutls_dh_params_import_pkcs3 (dh_params, &p3, GNUTLS_X509_FMT_PEM);
 178 }
 179
 180 static int
 181 pskfunc (gnutls_session_t session, const char *username, gnutls_datum_t * key)
 182 {
 183   printf ("psk callback to get %s's password\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 int 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   success ("Launched, generating DH parameters...\n");
 207
 208   /* Socket operations
 209    */
 210   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 211   if (err == -1)
 212     {
 213       perror ("socket");
 214       fail ("server: socket failed\n");
 215       return;
 216     }
 217
 218   memset (&sa_serv, '\0', sizeof (sa_serv));
 219   sa_serv.sin_family = AF_INET;
 220   sa_serv.sin_addr.s_addr = INADDR_ANY;
 221   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 222
 223   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval, sizeof (int));
 224
 225   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 226   if (err == -1)
 227     {
 228       perror ("bind");
 229       fail ("server: bind failed\n");
 230       return;
 231     }
 232
 233   err = listen (listen_sd, 1024);
 234   if (err == -1)
 235     {
 236       perror ("listen");
 237       fail ("server: listen failed\n");
 238       return;
 239     }
 240
 241   success ("server: ready. Listening to port '%d'.\n", PORT);
 242 }
 243
 244 static void
 245 server (void)
 246 {
 247   /* this must be called once in the program
 248    */
 249   gnutls_global_init ();
 250
 251   gnutls_global_set_log_function (tls_log_func);
 252   if (debug)
 253     gnutls_global_set_log_level (4711);
 254
 255   generate_dh_params ();
 256
 257   gnutls_psk_allocate_server_credentials (&server_pskcred);
 258   gnutls_psk_set_server_credentials_function (server_pskcred, pskfunc);
 259   gnutls_psk_set_server_dh_params (server_pskcred, dh_params);
 260
 261   client_len = sizeof (sa_cli);
 262
 263   session = initialize_tls_session ();
 264
 265   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 266
 267   success ("server: connection from %s, port %d\n",
 268            inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 269                       sizeof (topbuf)), ntohs (sa_cli.sin_port));
 270
 271   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 272   ret = gnutls_handshake (session);
 273   if (ret < 0)
 274     {
 275       close (sd);
 276       gnutls_deinit (session);
 277       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 278       return;
 279     }
 280   success ("server: Handshake was completed\n");
 281
 282   /* see the Getting peer's information example */
 283   /* print_info(session); */
 284
 285   i = 0;
 286   for (;;)
 287     {
 288       memset (buffer, 0, MAX_BUF + 1);
 289       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 290
 291       if (ret == 0)
 292         {
 293           success ("server: Peer has closed the GNUTLS connection\n");
 294           break;
 295         }
 296       else if (ret < 0)
 297         {
 298           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 299           break;
 300         }
 301       else if (ret > 0)
 302         {
 303           /* echo data back to the client
 304            */
 305           gnutls_record_send (session, buffer, strlen (buffer));
 306         }
 307     }
 308   /* do not wait for the peer to close the connection.
 309    */
 310   gnutls_bye (session, GNUTLS_SHUT_WR);
 311
 312   close (sd);
 313   gnutls_deinit (session);
 314
 315   close (listen_sd);
 316
 317   gnutls_psk_free_server_credentials (server_pskcred);
 318
 319   gnutls_dh_params_deinit (dh_params);
 320
 321   gnutls_global_deinit ();
 322
 323   success ("server: finished\n");
 324 }
 325
 326 void
 327 doit (void)
 328 {
 329   pid_t child;
 330
 331   server_start ();
 332   if (error_count)
 333     return;
 334
 335   child = fork ();
 336   if (child < 0)
 337     {
 338       perror ("fork");
 339       fail ("fork");
 340       return;
 341     }
 342
 343   if (child)
 344     {
 345       int status;
 346       /* parent */
 347       server ();
 348       wait (&status);
 349     }
 350   else
 351     client ();
 352 }