tests/dhepskself.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 #define MAX_BUF 1024
  50 #define MSG "Hello TLS"
  51
  52 static void
  53 tls_log_func (int level, const char *str)
  54 {
  55   fprintf (stderr, "|<%d>| %s", level, str);
  56 }
  57
  58 static void
  59 client (void)
  60 {
  61   int ret, sd, ii;
  62   gnutls_session_t session;
  63   char buffer[MAX_BUF + 1];
  64   gnutls_psk_client_credentials_t pskcred;
  65   const gnutls_datum_t key = { (void *) "DEADBEEF", 8 };
  66
  67   gnutls_global_init ();
  68
  69   gnutls_global_set_log_function (tls_log_func);
  70   if (debug)
  71     gnutls_global_set_log_level (5);
  72
  73   gnutls_psk_allocate_client_credentials (&pskcred);
  74   gnutls_psk_set_client_credentials (pskcred, "test", &key,
  75                                      GNUTLS_PSK_KEY_HEX);
  76
  77   /* Initialize TLS session
  78    */
  79   gnutls_init (&session, GNUTLS_CLIENT);
  80
  81   /* Use default priorities */
  82   gnutls_priority_set_direct (session, "NORMAL:+DHE-PSK", NULL);
  83
  84   /* put the anonymous credentials to the current session
  85    */
  86   gnutls_credentials_set (session, GNUTLS_CRD_PSK, pskcred);
  87
  88   /* connect to the peer
  89    */
  90   sd = tcp_connect ();
  91
  92   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
  93
  94   /* Perform the TLS handshake
  95    */
  96   ret = gnutls_handshake (session);
  97
  98   if (ret < 0)
  99     {
 100       fail ("client: Handshake failed\n");
 101       gnutls_perror (ret);
 102       goto end;
 103     }
 104   else
 105     {
 106       if (debug)
 107         success ("client: Handshake was completed\n");
 108     }
 109
 110   gnutls_record_send (session, MSG, strlen (MSG));
 111
 112   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 113   if (ret == 0)
 114     {
 115       if (debug)
 116         success ("client: Peer has closed the TLS connection\n");
 117       goto end;
 118     }
 119   else if (ret < 0)
 120     {
 121       fail ("client: Error: %s\n", gnutls_strerror (ret));
 122       goto end;
 123     }
 124
 125   if (debug)
 126     {
 127       printf ("- Received %d bytes: ", ret);
 128       for (ii = 0; ii < ret; ii++)
 129         fputc (buffer[ii], stdout);
 130       fputs ("\n", stdout);
 131     }
 132
 133   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 134
 135 end:
 136
 137   tcp_close (sd);
 138
 139   gnutls_deinit (session);
 140
 141   gnutls_psk_free_client_credentials (pskcred);
 142
 143   gnutls_global_deinit ();
 144 }
 145
 146 /* This is a sample TLS 1.0 echo server, for PSK authentication.
 147  */
 148
 149 #define SA struct sockaddr
 150 #define MAX_BUF 1024
 151 #define PORT 5556               /* listen to 5556 port */
 152
 153 /* These are global */
 154 gnutls_psk_server_credentials_t server_pskcred;
 155
 156 static gnutls_session_t
 157 initialize_tls_session (void)
 158 {
 159   gnutls_session_t session;
 160
 161   gnutls_init (&session, GNUTLS_SERVER);
 162
 163   /* avoid calling all the priority functions, since the defaults
 164    * are adequate.
 165    */
 166   gnutls_priority_set_direct(session, "NORMAL:+DHE-PSK", NULL);
 167
 168   gnutls_credentials_set (session, GNUTLS_CRD_PSK, server_pskcred);
 169
 170   return session;
 171 }
 172
 173 static gnutls_dh_params_t dh_params;
 174
 175 static int
 176 generate_dh_params (void)
 177 {
 178   const gnutls_datum_t p3 = { (void *) pkcs3, strlen (pkcs3) };
 179   /* Generate Diffie-Hellman parameters - for use with DHE
 180    * kx algorithms. These should be discarded and regenerated
 181    * once a day, once a week or once a month. Depending on the
 182    * security requirements.
 183    */
 184   gnutls_dh_params_init (&dh_params);
 185   return gnutls_dh_params_import_pkcs3 (dh_params, &p3, GNUTLS_X509_FMT_PEM);
 186 }
 187
 188 static int
 189 pskfunc (gnutls_session_t session, const char *username, gnutls_datum_t * key)
 190 {
 191   if (debug)
 192     printf ("psk callback to get %s's password\n", username);
 193   key->data = gnutls_malloc (4);
 194   key->data[0] = 0xDE;
 195   key->data[1] = 0xAD;
 196   key->data[2] = 0xBE;
 197   key->data[3] = 0xEF;
 198   key->size = 4;
 199   return 0;
 200 }
 201
 202 int err, listen_sd, i;
 203 int sd, ret;
 204 struct sockaddr_in sa_serv;
 205 struct sockaddr_in sa_cli;
 206 socklen_t client_len;
 207 char topbuf[512];
 208 gnutls_session_t session;
 209 char buffer[MAX_BUF + 1];
 210 int optval = 1;
 211
 212 static void
 213 server_start (void)
 214 {
 215   if (debug)
 216     success ("Launched, generating DH parameters...\n");
 217
 218   /* Socket operations
 219    */
 220   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 221   if (err == -1)
 222     {
 223       perror ("socket");
 224       fail ("server: socket failed\n");
 225       return;
 226     }
 227
 228   memset (&sa_serv, '\0', sizeof (sa_serv));
 229   sa_serv.sin_family = AF_INET;
 230   sa_serv.sin_addr.s_addr = INADDR_ANY;
 231   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 232
 233   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval,
 234               sizeof (int));
 235
 236   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 237   if (err == -1)
 238     {
 239       perror ("bind");
 240       fail ("server: bind failed\n");
 241       return;
 242     }
 243
 244   err = listen (listen_sd, 1024);
 245   if (err == -1)
 246     {
 247       perror ("listen");
 248       fail ("server: listen failed\n");
 249       return;
 250     }
 251
 252   if (debug)
 253     success ("server: ready. Listening to port '%d'.\n", PORT);
 254 }
 255
 256 static void
 257 server (void)
 258 {
 259   /* this must be called once in the program
 260    */
 261   gnutls_global_init ();
 262
 263   gnutls_global_set_log_function (tls_log_func);
 264   if (debug)
 265     gnutls_global_set_log_level (4711);
 266
 267   generate_dh_params ();
 268
 269   gnutls_psk_allocate_server_credentials (&server_pskcred);
 270   gnutls_psk_set_server_credentials_function (server_pskcred, pskfunc);
 271   gnutls_psk_set_server_dh_params (server_pskcred, dh_params);
 272
 273   client_len = sizeof (sa_cli);
 274
 275   session = initialize_tls_session ();
 276
 277   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 278
 279   if (debug)
 280     success ("server: connection from %s, port %d\n",
 281              inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 282                         sizeof (topbuf)), ntohs (sa_cli.sin_port));
 283
 284   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 285   ret = gnutls_handshake (session);
 286   if (ret < 0)
 287     {
 288       close (sd);
 289       gnutls_deinit (session);
 290       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 291       return;
 292     }
 293   if (debug)
 294     success ("server: Handshake was completed\n");
 295
 296   /* see the Getting peer's information example */
 297   /* print_info(session); */
 298
 299   i = 0;
 300   for (;;)
 301     {
 302       memset (buffer, 0, MAX_BUF + 1);
 303       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 304
 305       if (ret == 0)
 306         {
 307           if (debug)
 308             success ("server: Peer has closed the GnuTLS connection\n");
 309           break;
 310         }
 311       else if (ret < 0)
 312         {
 313           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 314           break;
 315         }
 316       else if (ret > 0)
 317         {
 318           /* echo data back to the client
 319            */
 320           gnutls_record_send (session, buffer, strlen (buffer));
 321         }
 322     }
 323   /* do not wait for the peer to close the connection.
 324    */
 325   gnutls_bye (session, GNUTLS_SHUT_WR);
 326
 327   close (sd);
 328   gnutls_deinit (session);
 329
 330   close (listen_sd);
 331
 332   gnutls_psk_free_server_credentials (server_pskcred);
 333
 334   gnutls_dh_params_deinit (dh_params);
 335
 336   gnutls_global_deinit ();
 337
 338   if (debug)
 339     success ("server: finished\n");
 340 }
 341
 342 void
 343 doit (void)
 344 {
 345   pid_t child;
 346
 347   server_start ();
 348   if (error_count)
 349     return;
 350
 351   child = fork ();
 352   if (child < 0)
 353     {
 354       perror ("fork");
 355       fail ("fork");
 356       return;
 357     }
 358
 359   if (child)
 360     {
 361       int status;
 362       /* parent */
 363       server ();
 364       wait (&status);
 365     }
 366   else
 367     client ();
 368 }