tests/oprfi.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2006, 2007 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 <netinet/in.h>
  34 #include <sys/socket.h>
  35 #include <sys/wait.h>
  36 #include <arpa/inet.h>
  37 #include <unistd.h>
  38 #include <gnutls/gnutls.h>
  39
  40 #include "utils.h"
  41
  42 static void
  43 tls_log_func (int level, const char *str)
  44 {
  45   fprintf (stderr, "|<%d>| %s", level, str);
  46 }
  47
  48 /* A very basic TLS client, with anonymous authentication.
  49  */
  50
  51 #define MAX_BUF 1024
  52 #define MSG "Hello TLS"
  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_anon_client_credentials_t anoncred;
 100   /* Need to enable anonymous KX specifically. */
 101   const int kx_prio[] = { GNUTLS_KX_ANON_DH, 0 };
 102
 103   gnutls_global_init ();
 104
 105   gnutls_global_set_log_function (tls_log_func);
 106   gnutls_global_set_log_level (4711);
 107
 108   gnutls_anon_allocate_client_credentials (&anoncred);
 109
 110   /* Initialize TLS session
 111    */
 112   gnutls_init (&session, GNUTLS_CLIENT);
 113
 114   /* Use default priorities */
 115   gnutls_set_default_priority (session);
 116   gnutls_kx_set_priority (session, kx_prio);
 117
 118   /* put the anonymous credentials to the current session
 119    */
 120   gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
 121
 122   gnutls_oprfi_enable_client (session, 3, "foo");
 123
 124   /* connect to the peer
 125    */
 126   sd = tcp_connect ();
 127
 128   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 129
 130   /* Perform the TLS handshake
 131    */
 132   ret = gnutls_handshake (session);
 133
 134   if (ret < 0)
 135     {
 136       fail ("client: Handshake failed\n");
 137       gnutls_perror (ret);
 138       goto end;
 139     }
 140   else
 141     {
 142       success ("client: Handshake was completed\n");
 143     }
 144
 145   success ("client: TLS version is: %s\n",
 146            gnutls_protocol_get_name (gnutls_protocol_get_version (session)));
 147
 148   gnutls_record_send (session, MSG, strlen (MSG));
 149
 150   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 151   if (ret == 0)
 152     {
 153       success ("client: Peer has closed the TLS connection\n");
 154       goto end;
 155     }
 156   else if (ret < 0)
 157     {
 158       fail ("client: Error: %s\n", gnutls_strerror (ret));
 159       goto end;
 160     }
 161
 162   printf ("- Received %d bytes: ", ret);
 163   for (ii = 0; ii < ret; ii++)
 164     {
 165       fputc (buffer[ii], stdout);
 166     }
 167   fputs ("\n", stdout);
 168
 169   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 170
 171 end:
 172
 173   tcp_close (sd);
 174
 175   gnutls_deinit (session);
 176
 177   gnutls_anon_free_client_credentials (anoncred);
 178
 179   gnutls_global_deinit ();
 180 }
 181
 182 /* This is a sample TLS 1.0 echo server, for anonymous authentication only.
 183  */
 184
 185 #define SA struct sockaddr
 186 #define MAX_BUF 1024
 187 #define PORT 5556               /* listen to 5556 port */
 188 #define DH_BITS 1024
 189
 190 /* These are global */
 191 gnutls_anon_server_credentials_t anoncred;
 192
 193 int
 194 oprfi_callback (gnutls_session_t session,
 195                 void *userdata,
 196                 size_t oprfi_len,
 197                 const unsigned char *in_oprfi,
 198                 unsigned char *out_oprfi)
 199 {
 200   size_t i;
 201
 202   puts("cb");
 203
 204   for (i = 0; i < oprfi_len; i++)
 205     printf ("OPRF[%d]: %02x %03d %c\n", i, in_oprfi[i],
 206             in_oprfi[i], in_oprfi[i]);
 207
 208   memset (out_oprfi, 42, oprfi_len);
 209
 210   return 0;
 211 }
 212
 213 gnutls_session_t
 214 initialize_tls_session (void)
 215 {
 216   gnutls_session_t session;
 217   const int kx_prio[] = { GNUTLS_KX_ANON_DH, 0 };
 218
 219   gnutls_init (&session, GNUTLS_SERVER);
 220
 221   /* avoid calling all the priority functions, since the defaults
 222    * are adequate.
 223    */
 224   gnutls_set_default_priority (session);
 225   gnutls_kx_set_priority (session, kx_prio);
 226
 227   gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
 228
 229   gnutls_dh_set_prime_bits (session, DH_BITS);
 230
 231   gnutls_oprfi_enable_server (session, oprfi_callback, NULL);
 232
 233   return session;
 234 }
 235
 236 static gnutls_dh_params_t dh_params;
 237
 238 static int
 239 generate_dh_params (void)
 240 {
 241   const gnutls_datum_t p3 = { pkcs3, strlen (pkcs3) };
 242   /* Generate Diffie Hellman parameters - for use with DHE
 243    * kx algorithms. These should be discarded and regenerated
 244    * once a day, once a week or once a month. Depending on the
 245    * security requirements.
 246    */
 247   gnutls_dh_params_init (&dh_params);
 248   return gnutls_dh_params_import_pkcs3 (dh_params, &p3, GNUTLS_X509_FMT_PEM);
 249 }
 250
 251 int err, listen_sd, i;
 252 int sd, ret;
 253 struct sockaddr_in sa_serv;
 254 struct sockaddr_in sa_cli;
 255 int client_len;
 256 char topbuf[512];
 257 gnutls_session_t session;
 258 char buffer[MAX_BUF + 1];
 259 int optval = 1;
 260
 261 void
 262 server_start (void)
 263 {
 264   /* this must be called once in the program
 265    */
 266   gnutls_global_init ();
 267
 268   gnutls_global_set_log_function (tls_log_func);
 269   gnutls_global_set_log_level (4711);
 270
 271   gnutls_anon_allocate_server_credentials (&anoncred);
 272
 273   success ("Launched, generating DH parameters...\n");
 274
 275   generate_dh_params ();
 276
 277   gnutls_anon_set_server_dh_params (anoncred, dh_params);
 278
 279   /* Socket operations
 280    */
 281   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 282   if (err == -1)
 283     {
 284       perror ("socket");
 285       fail ("server: socket failed\n");
 286       return;
 287     }
 288
 289   memset (&sa_serv, '\0', sizeof (sa_serv));
 290   sa_serv.sin_family = AF_INET;
 291   sa_serv.sin_addr.s_addr = INADDR_ANY;
 292   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 293
 294   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof (int));
 295
 296   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 297   if (err == -1)
 298     {
 299       perror ("bind");
 300       fail ("server: bind failed\n");
 301       return;
 302     }
 303
 304   err = listen (listen_sd, 1024);
 305   if (err == -1)
 306     {
 307       perror ("listen");
 308       fail ("server: listen failed\n");
 309       return;
 310     }
 311
 312   success ("server: ready. Listening to port '%d'.\n", PORT);
 313 }
 314
 315 void
 316 server (void)
 317 {
 318   client_len = sizeof (sa_cli);
 319
 320   session = initialize_tls_session ();
 321
 322   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 323
 324   success ("server: connection from %s, port %d\n",
 325            inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 326                       sizeof (topbuf)), ntohs (sa_cli.sin_port));
 327
 328   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 329   ret = gnutls_handshake (session);
 330   if (ret < 0)
 331     {
 332       close (sd);
 333       gnutls_deinit (session);
 334       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 335       return;
 336     }
 337   success ("server: Handshake was completed\n");
 338
 339   success ("server: TLS version is: %s\n",
 340            gnutls_protocol_get_name (gnutls_protocol_get_version (session)));
 341
 342   /* see the Getting peer's information example */
 343   /* print_info(session); */
 344
 345   i = 0;
 346   for (;;)
 347     {
 348       bzero (buffer, MAX_BUF + 1);
 349       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 350
 351       if (ret == 0)
 352         {
 353           success ("server: Peer has closed the GNUTLS connection\n");
 354           break;
 355         }
 356       else if (ret < 0)
 357         {
 358           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 359           break;
 360         }
 361       else if (ret > 0)
 362         {
 363           /* echo data back to the client
 364            */
 365           gnutls_record_send (session, buffer, strlen (buffer));
 366         }
 367     }
 368   /* do not wait for the peer to close the connection.
 369    */
 370   gnutls_bye (session, GNUTLS_SHUT_WR);
 371
 372   close (sd);
 373   gnutls_deinit (session);
 374
 375   close (listen_sd);
 376
 377   gnutls_anon_free_server_credentials (anoncred);
 378
 379   gnutls_global_deinit ();
 380
 381   success ("server: finished\n");
 382 }
 383
 384 void
 385 doit (void)
 386 {
 387   pid_t child;
 388
 389   server_start ();
 390   if (error_count)
 391     return;
 392
 393   child = fork ();
 394   if (child < 0)
 395     {
 396       perror ("fork");
 397       fail ("fork");
 398       return;
 399     }
 400
 401   if (child)
 402     {
 403       int status;
 404       /* parent */
 405       server ();
 406       wait (&status);
 407     }
 408   else
 409     client ();
 410 }