tests/dhepskself.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 static void
  49 tls_log_func (int level, const char *str)
  50 {
  51   fprintf (stderr, "|<%d>| %s", level, str);
  52 }
  53
  54 /* Connects to the peer and returns a socket
  55  * descriptor.
  56  */
  57 int
  58 tcp_connect (void)
  59 {
  60   const char *PORT = "5556";
  61   const char *SERVER = "127.0.0.1";
  62   int err, sd;
  63   struct sockaddr_in sa;
  64
  65   /* connects to server
  66    */
  67   sd = socket (AF_INET, SOCK_STREAM, 0);
  68
  69   memset (&sa, '\0', sizeof (sa));
  70   sa.sin_family = AF_INET;
  71   sa.sin_port = htons (atoi (PORT));
  72   inet_pton (AF_INET, SERVER, &sa.sin_addr);
  73
  74   err = connect (sd, (struct sockaddr *) &sa, sizeof (sa));
  75   if (err < 0)
  76     {
  77       fprintf (stderr, "Connect error\n");
  78       exit (1);
  79     }
  80
  81   return sd;
  82 }
  83
  84 /* closes the given socket descriptor.
  85  */
  86 void
  87 tcp_close (int sd)
  88 {
  89   shutdown (sd, SHUT_RDWR);     /* no more receptions */
  90   close (sd);
  91 }
  92
  93 void
  94 client (void)
  95 {
  96   int ret, sd, ii;
  97   gnutls_session_t session;
  98   char buffer[MAX_BUF + 1];
  99   gnutls_psk_client_credentials_t pskcred;
 100   const gnutls_datum_t key = { "DEADBEEF", 8 };
 101
 102   gnutls_global_init ();
 103
 104   gnutls_global_set_log_function (tls_log_func);
 105 //  gnutls_global_set_log_level (99);
 106
 107   gnutls_psk_allocate_client_credentials (&pskcred);
 108   gnutls_psk_set_client_credentials (pskcred, "test", &key,
 109                                      GNUTLS_PSK_KEY_HEX);
 110
 111   /* Initialize TLS session
 112    */
 113   gnutls_init (&session, GNUTLS_CLIENT);
 114
 115   /* Use default priorities */
 116   gnutls_set_default_priority (session);
 117
 118   /* put the anonymous credentials to the current session
 119    */
 120   gnutls_credentials_set (session, GNUTLS_CRD_PSK, pskcred);
 121
 122   /* connect to the peer
 123    */
 124   sd = tcp_connect ();
 125
 126   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 127
 128   /* Perform the TLS handshake
 129    */
 130   ret = gnutls_handshake (session);
 131
 132   if (ret < 0)
 133     {
 134       fail ("client: Handshake failed\n");
 135       gnutls_perror (ret);
 136       goto end;
 137     }
 138   else
 139     {
 140       success ("client: Handshake was completed\n");
 141     }
 142
 143   gnutls_record_send (session, MSG, strlen (MSG));
 144
 145   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 146   if (ret == 0)
 147     {
 148       success ("client: Peer has closed the TLS connection\n");
 149       goto end;
 150     }
 151   else if (ret < 0)
 152     {
 153       fail ("client: Error: %s\n", gnutls_strerror (ret));
 154       goto end;
 155     }
 156
 157   printf ("- Received %d bytes: ", ret);
 158   for (ii = 0; ii < ret; ii++)
 159       fputc (buffer[ii], stdout);
 160   fputs ("\n", stdout);
 161
 162   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 163
 164 end:
 165
 166   tcp_close (sd);
 167
 168   gnutls_deinit (session);
 169
 170   gnutls_psk_free_client_credentials (pskcred);
 171
 172   gnutls_global_deinit ();
 173 }
 174
 175 /* This is a sample TLS 1.0 echo server, for PSK authentication.
 176  */
 177
 178 #define SA struct sockaddr
 179 #define MAX_BUF 1024
 180 #define PORT 5556               /* listen to 5556 port */
 181 #define DH_BITS 1024
 182
 183 /* These are global */
 184 gnutls_psk_server_credentials_t server_pskcred;
 185
 186 gnutls_session_t
 187 initialize_tls_session (void)
 188 {
 189   gnutls_session_t session;
 190
 191   gnutls_init (&session, GNUTLS_SERVER);
 192
 193   /* avoid calling all the priority functions, since the defaults
 194    * are adequate.
 195    */
 196   gnutls_set_default_priority (session);
 197
 198   gnutls_credentials_set (session, GNUTLS_CRD_PSK, server_pskcred);
 199
 200   return session;
 201 }
 202
 203 static gnutls_dh_params_t dh_params;
 204
 205 static int
 206 generate_dh_params (void)
 207 {
 208   const gnutls_datum_t p3 = { pkcs3, strlen (pkcs3) };
 209   /* Generate Diffie Hellman parameters - for use with DHE
 210    * kx algorithms. These should be discarded and regenerated
 211    * once a day, once a week or once a month. Depending on the
 212    * security requirements.
 213    */
 214   gnutls_dh_params_init (&dh_params);
 215   return gnutls_dh_params_import_pkcs3 (dh_params, &p3, GNUTLS_X509_FMT_PEM);
 216 }
 217
 218 static int
 219 pskfunc (gnutls_session_t session, const char *username, gnutls_datum_t * key)
 220 {
 221   printf ("psk callback to get %s's password\n", username);
 222   key->data = gnutls_malloc (4);
 223   key->data[0] = 0xDE;
 224   key->data[1] = 0xAD;
 225   key->data[2] = 0xBE;
 226   key->data[3] = 0xEF;
 227   key->size = 4;
 228   return 0;
 229 }
 230
 231 int err, listen_sd, i;
 232 int sd, ret;
 233 struct sockaddr_in sa_serv;
 234 struct sockaddr_in sa_cli;
 235 int client_len;
 236 char topbuf[512];
 237 gnutls_session_t session;
 238 char buffer[MAX_BUF + 1];
 239 int optval = 1;
 240
 241 void
 242 server_start (void)
 243 {
 244   /* this must be called once in the program
 245    */
 246   gnutls_global_init ();
 247
 248   gnutls_global_set_log_function (tls_log_func);
 249 //  gnutls_global_set_log_level (99);
 250
 251   generate_dh_params ();
 252
 253   gnutls_psk_allocate_server_credentials (&server_pskcred);
 254   gnutls_psk_set_server_credentials_function (server_pskcred, pskfunc);
 255   gnutls_psk_set_server_dh_params (server_pskcred, dh_params);
 256
 257   success ("Launched, generating DH parameters...\n");
 258
 259   /* Socket operations
 260    */
 261   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 262   if (err == -1)
 263     {
 264       perror ("socket");
 265       fail ("server: socket failed\n");
 266       return;
 267     }
 268
 269   memset (&sa_serv, '\0', sizeof (sa_serv));
 270   sa_serv.sin_family = AF_INET;
 271   sa_serv.sin_addr.s_addr = INADDR_ANY;
 272   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 273
 274   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof (int));
 275
 276   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 277   if (err == -1)
 278     {
 279       perror ("bind");
 280       fail ("server: bind failed\n");
 281       return;
 282     }
 283
 284   err = listen (listen_sd, 1024);
 285   if (err == -1)
 286     {
 287       perror ("listen");
 288       fail ("server: listen failed\n");
 289       return;
 290     }
 291
 292   success ("server: ready. Listening to port '%d'.\n", PORT);
 293 }
 294
 295 void
 296 server (void)
 297 {
 298   client_len = sizeof (sa_cli);
 299
 300   session = initialize_tls_session ();
 301
 302   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 303
 304   success ("server: connection from %s, port %d\n",
 305            inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 306                       sizeof (topbuf)), ntohs (sa_cli.sin_port));
 307
 308   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 309   ret = gnutls_handshake (session);
 310   if (ret < 0)
 311     {
 312       close (sd);
 313       gnutls_deinit (session);
 314       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 315       return;
 316     }
 317   success ("server: Handshake was completed\n");
 318
 319   /* see the Getting peer's information example */
 320   /* print_info(session); */
 321
 322   i = 0;
 323   for (;;)
 324     {
 325       bzero (buffer, MAX_BUF + 1);
 326       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 327
 328       if (ret == 0)
 329         {
 330           success ("server: Peer has closed the GNUTLS connection\n");
 331           break;
 332         }
 333       else if (ret < 0)
 334         {
 335           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 336           break;
 337         }
 338       else if (ret > 0)
 339         {
 340           /* echo data back to the client
 341            */
 342           gnutls_record_send (session, buffer, strlen (buffer));
 343         }
 344     }
 345   /* do not wait for the peer to close the connection.
 346    */
 347   gnutls_bye (session, GNUTLS_SHUT_WR);
 348
 349   close (sd);
 350   gnutls_deinit (session);
 351
 352   close (listen_sd);
 353
 354   gnutls_psk_free_server_credentials (server_pskcred);
 355
 356   gnutls_global_deinit ();
 357
 358   success ("server: finished\n");
 359 }
 360
 361 void
 362 doit (void)
 363 {
 364   pid_t child;
 365
 366   server_start ();
 367   if (error_count)
 368     return;
 369
 370   child = fork ();
 371   if (child < 0)
 372     {
 373       perror ("fork");
 374       fail ("fork");
 375       return;
 376     }
 377
 378   if (child)
 379     {
 380       int status;
 381       /* parent */
 382       server ();
 383       wait (&status);
 384     }
 385   else
 386     client ();
 387 }