tests/anonself.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   /* 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   success ("client: TLS version is: %s\n",
 144            gnutls_protocol_get_name (gnutls_protocol_get_version (session)));
 145
 146   gnutls_record_send (session, MSG, strlen (MSG));
 147
 148   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 149   if (ret == 0)
 150     {
 151       success ("client: Peer has closed the TLS connection\n");
 152       goto end;
 153     }
 154   else if (ret < 0)
 155     {
 156       fail ("client: Error: %s\n", gnutls_strerror (ret));
 157       goto end;
 158     }
 159
 160   printf ("- Received %d bytes: ", ret);
 161   for (ii = 0; ii < ret; ii++)
 162     {
 163       fputc (buffer[ii], stdout);
 164     }
 165   fputs ("\n", stdout);
 166
 167   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 168
 169 end:
 170
 171   tcp_close (sd);
 172
 173   gnutls_deinit (session);
 174
 175   gnutls_anon_free_client_credentials (anoncred);
 176
 177   gnutls_global_deinit ();
 178 }
 179
 180 /* This is a sample TLS 1.0 echo server, for anonymous authentication only.
 181  */
 182
 183 #define SA struct sockaddr
 184 #define MAX_BUF 1024
 185 #define PORT 5556               /* listen to 5556 port */
 186 #define DH_BITS 1024
 187
 188 /* These are global */
 189 gnutls_anon_server_credentials_t anoncred;
 190
 191 gnutls_session_t
 192 initialize_tls_session (void)
 193 {
 194   gnutls_session_t session;
 195   const int kx_prio[] = { GNUTLS_KX_ANON_DH, 0 };
 196
 197   gnutls_init (&session, GNUTLS_SERVER);
 198
 199   /* avoid calling all the priority functions, since the defaults
 200    * are adequate.
 201    */
 202   gnutls_set_default_priority (session);
 203   gnutls_kx_set_priority (session, kx_prio);
 204
 205   gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
 206
 207   gnutls_dh_set_prime_bits (session, DH_BITS);
 208
 209   return session;
 210 }
 211
 212 static gnutls_dh_params_t dh_params;
 213
 214 static int
 215 generate_dh_params (void)
 216 {
 217   const gnutls_datum_t p3 = { pkcs3, strlen (pkcs3) };
 218   /* Generate Diffie Hellman parameters - for use with DHE
 219    * kx algorithms. These should be discarded and regenerated
 220    * once a day, once a week or once a month. Depending on the
 221    * security requirements.
 222    */
 223   gnutls_dh_params_init (&dh_params);
 224   return gnutls_dh_params_import_pkcs3 (dh_params, &p3, GNUTLS_X509_FMT_PEM);
 225 }
 226
 227 int err, listen_sd, i;
 228 int sd, ret;
 229 struct sockaddr_in sa_serv;
 230 struct sockaddr_in sa_cli;
 231 int client_len;
 232 char topbuf[512];
 233 gnutls_session_t session;
 234 char buffer[MAX_BUF + 1];
 235 int optval = 1;
 236
 237 void
 238 server_start (void)
 239 {
 240   /* this must be called once in the program
 241    */
 242   gnutls_global_init ();
 243
 244   gnutls_global_set_log_function (tls_log_func);
 245   gnutls_global_set_log_level (4711);
 246
 247   gnutls_anon_allocate_server_credentials (&anoncred);
 248
 249   success ("Launched, generating DH parameters...\n");
 250
 251   generate_dh_params ();
 252
 253   gnutls_anon_set_server_dh_params (anoncred, dh_params);
 254
 255   /* Socket operations
 256    */
 257   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 258   if (err == -1)
 259     {
 260       perror ("socket");
 261       fail ("server: socket failed\n");
 262       return;
 263     }
 264
 265   memset (&sa_serv, '\0', sizeof (sa_serv));
 266   sa_serv.sin_family = AF_INET;
 267   sa_serv.sin_addr.s_addr = INADDR_ANY;
 268   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 269
 270   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof (int));
 271
 272   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 273   if (err == -1)
 274     {
 275       perror ("bind");
 276       fail ("server: bind failed\n");
 277       return;
 278     }
 279
 280   err = listen (listen_sd, 1024);
 281   if (err == -1)
 282     {
 283       perror ("listen");
 284       fail ("server: listen failed\n");
 285       return;
 286     }
 287
 288   success ("server: ready. Listening to port '%d'.\n", PORT);
 289 }
 290
 291 void
 292 server (void)
 293 {
 294   client_len = sizeof (sa_cli);
 295
 296   session = initialize_tls_session ();
 297
 298   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 299
 300   success ("server: connection from %s, port %d\n",
 301            inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 302                       sizeof (topbuf)), ntohs (sa_cli.sin_port));
 303
 304   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 305   ret = gnutls_handshake (session);
 306   if (ret < 0)
 307     {
 308       close (sd);
 309       gnutls_deinit (session);
 310       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 311       return;
 312     }
 313   success ("server: Handshake was completed\n");
 314
 315   success ("server: TLS version is: %s\n",
 316            gnutls_protocol_get_name (gnutls_protocol_get_version (session)));
 317
 318   /* see the Getting peer's information example */
 319   /* print_info(session); */
 320
 321   i = 0;
 322   for (;;)
 323     {
 324       bzero (buffer, MAX_BUF + 1);
 325       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 326
 327       if (ret == 0)
 328         {
 329           success ("server: Peer has closed the GNUTLS connection\n");
 330           break;
 331         }
 332       else if (ret < 0)
 333         {
 334           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 335           break;
 336         }
 337       else if (ret > 0)
 338         {
 339           /* echo data back to the client
 340            */
 341           gnutls_record_send (session, buffer, strlen (buffer));
 342         }
 343     }
 344   /* do not wait for the peer to close the connection.
 345    */
 346   gnutls_bye (session, GNUTLS_SHUT_WR);
 347
 348   close (sd);
 349   gnutls_deinit (session);
 350
 351   close (listen_sd);
 352
 353   gnutls_anon_free_server_credentials (anoncred);
 354
 355   gnutls_global_deinit ();
 356
 357   success ("server: finished\n");
 358 }
 359
 360 void
 361 doit (void)
 362 {
 363   pid_t child;
 364
 365   server_start ();
 366   if (error_count)
 367     return;
 368
 369   child = fork ();
 370   if (child < 0)
 371     {
 372       perror ("fork");
 373       fail ("fork");
 374       return;
 375     }
 376
 377   if (child)
 378     {
 379       int status;
 380       /* parent */
 381       server ();
 382       wait (&status);
 383     }
 384   else
 385     client ();
 386 }