tests/anonself.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 <netinet/in.h>
  34 #include <sys/socket.h>
  35 #if !defined(_WIN32)
  36 #include <sys/wait.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 static void
  47 tls_log_func (int level, const char *str)
  48 {
  49   fprintf (stderr, "|<%d>| %s", level, str);
  50 }
  51
  52 /* A very basic TLS client, with anonymous authentication.
  53  */
  54
  55 #define MAX_BUF 1024
  56 #define MSG "Hello TLS"
  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_anon_client_credentials_t anoncred;
  65   /* Need to enable anonymous KX specifically. */
  66
  67   gnutls_global_init ();
  68
  69   gnutls_global_set_log_function (tls_log_func);
  70   if (debug)
  71     gnutls_global_set_log_level (4711);
  72
  73   gnutls_anon_allocate_client_credentials (&anoncred);
  74
  75   /* Initialize TLS session
  76    */
  77   gnutls_init (&session, GNUTLS_CLIENT);
  78
  79   /* Use default priorities */
  80   gnutls_priority_set_direct (session, "NONE:+VERS-TLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH", NULL);
  81
  82   /* put the anonymous credentials to the current session
  83    */
  84   gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
  85
  86   /* connect to the peer
  87    */
  88   sd = tcp_connect ();
  89
  90   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
  91
  92   /* Perform the TLS handshake
  93    */
  94   ret = gnutls_handshake (session);
  95
  96   if (ret < 0)
  97     {
  98       fail ("client: Handshake failed\n");
  99       gnutls_perror (ret);
 100       goto end;
 101     }
 102   else
 103     {
 104       if (debug)
 105         success ("client: Handshake was completed\n");
 106     }
 107
 108   if (debug)
 109     success ("client: TLS version is: %s\n",
 110              gnutls_protocol_get_name (gnutls_protocol_get_version
 111                                        (session)));
 112
 113   gnutls_record_send (session, MSG, strlen (MSG));
 114
 115   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 116   if (ret == 0)
 117     {
 118       if (debug)
 119         success ("client: Peer has closed the TLS connection\n");
 120       goto end;
 121     }
 122   else if (ret < 0)
 123     {
 124       fail ("client: Error: %s\n", gnutls_strerror (ret));
 125       goto end;
 126     }
 127
 128   if (debug)
 129     {
 130       printf ("- Received %d bytes: ", ret);
 131       for (ii = 0; ii < ret; ii++)
 132         {
 133           fputc (buffer[ii], stdout);
 134         }
 135       fputs ("\n", stdout);
 136     }
 137
 138   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 139
 140 end:
 141
 142   tcp_close (sd);
 143
 144   gnutls_deinit (session);
 145
 146   gnutls_anon_free_client_credentials (anoncred);
 147
 148   gnutls_global_deinit ();
 149 }
 150
 151 /* This is a sample TLS 1.0 echo server, for anonymous authentication only.
 152  */
 153
 154 #define SA struct sockaddr
 155 #define MAX_BUF 1024
 156 #define PORT 5556               /* listen to 5556 port */
 157 #define DH_BITS 1024
 158
 159 /* These are global */
 160 gnutls_anon_server_credentials_t anoncred;
 161
 162 static gnutls_session_t
 163 initialize_tls_session (void)
 164 {
 165   gnutls_session_t session;
 166
 167   gnutls_init (&session, GNUTLS_SERVER);
 168
 169   /* avoid calling all the priority functions, since the defaults
 170    * are adequate.
 171    */
 172   gnutls_priority_set_direct (session, "NONE:+VERS-TLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH", NULL);
 173
 174   gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
 175
 176   gnutls_dh_set_prime_bits (session, DH_BITS);
 177
 178   return session;
 179 }
 180
 181 static gnutls_dh_params_t dh_params;
 182
 183 static int
 184 generate_dh_params (void)
 185 {
 186   const gnutls_datum_t p3 = { (void *) pkcs3, strlen (pkcs3) };
 187   /* Generate Diffie-Hellman parameters - for use with DHE
 188    * kx algorithms. These should be discarded and regenerated
 189    * once a day, once a week or once a month. Depending on the
 190    * security requirements.
 191    */
 192   gnutls_dh_params_init (&dh_params);
 193   return gnutls_dh_params_import_pkcs3 (dh_params, &p3, GNUTLS_X509_FMT_PEM);
 194 }
 195
 196 int err, listen_sd, i;
 197 int sd, ret;
 198 struct sockaddr_in sa_serv;
 199 struct sockaddr_in sa_cli;
 200 socklen_t client_len;
 201 char topbuf[512];
 202 gnutls_session_t session;
 203 char buffer[MAX_BUF + 1];
 204 int optval = 1;
 205
 206 static void
 207 server_start (void)
 208 {
 209   /* Socket operations
 210    */
 211   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 212   if (err == -1)
 213     {
 214       perror ("socket");
 215       fail ("server: socket failed\n");
 216       return;
 217     }
 218
 219   memset (&sa_serv, '\0', sizeof (sa_serv));
 220   sa_serv.sin_family = AF_INET;
 221   sa_serv.sin_addr.s_addr = INADDR_ANY;
 222   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 223
 224   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval,
 225               sizeof (int));
 226
 227   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 228   if (err == -1)
 229     {
 230       perror ("bind");
 231       fail ("server: bind failed\n");
 232       return;
 233     }
 234
 235   err = listen (listen_sd, 1024);
 236   if (err == -1)
 237     {
 238       perror ("listen");
 239       fail ("server: listen failed\n");
 240       return;
 241     }
 242
 243   if (debug)
 244     success ("server: ready. Listening to port '%d'.\n", PORT);
 245 }
 246
 247 static void
 248 server (void)
 249 {
 250   /* this must be called once in the program
 251    */
 252   gnutls_global_init ();
 253
 254   gnutls_global_set_log_function (tls_log_func);
 255   if (debug)
 256     gnutls_global_set_log_level (4711);
 257
 258   gnutls_anon_allocate_server_credentials (&anoncred);
 259
 260   if (debug)
 261     success ("Launched, generating DH parameters...\n");
 262
 263   generate_dh_params ();
 264
 265   gnutls_anon_set_server_dh_params (anoncred, dh_params);
 266
 267   client_len = sizeof (sa_cli);
 268
 269   session = initialize_tls_session ();
 270
 271   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 272
 273   if (debug)
 274     success ("server: connection from %s, port %d\n",
 275              inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 276                         sizeof (topbuf)), ntohs (sa_cli.sin_port));
 277
 278   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 279   ret = gnutls_handshake (session);
 280   if (ret < 0)
 281     {
 282       close (sd);
 283       gnutls_deinit (session);
 284       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 285       return;
 286     }
 287   if (debug)
 288     success ("server: Handshake was completed\n");
 289
 290   if (debug)
 291     success ("server: TLS version is: %s\n",
 292              gnutls_protocol_get_name (gnutls_protocol_get_version
 293                                        (session)));
 294
 295   /* see the Getting peer's information example */
 296   /* print_info(session); */
 297
 298   i = 0;
 299   for (;;)
 300     {
 301       memset (buffer, 0, MAX_BUF + 1);
 302       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 303
 304       if (ret == 0)
 305         {
 306           if (debug)
 307             success ("server: Peer has closed the GnuTLS connection\n");
 308           break;
 309         }
 310       else if (ret < 0)
 311         {
 312           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 313           break;
 314         }
 315       else if (ret > 0)
 316         {
 317           /* echo data back to the client
 318            */
 319           gnutls_record_send (session, buffer, strlen (buffer));
 320         }
 321     }
 322   /* do not wait for the peer to close the connection.
 323    */
 324   gnutls_bye (session, GNUTLS_SHUT_WR);
 325
 326   close (sd);
 327   gnutls_deinit (session);
 328
 329   close (listen_sd);
 330
 331   gnutls_anon_free_server_credentials (anoncred);
 332
 333   gnutls_dh_params_deinit (dh_params);
 334
 335   gnutls_global_deinit ();
 336
 337   if (debug)
 338     success ("server: finished\n");
 339 }
 340
 341 void
 342 doit (void)
 343 {
 344   pid_t child;
 345
 346   server_start ();
 347   if (error_count)
 348     return;
 349
 350   child = fork ();
 351   if (child < 0)
 352     {
 353       perror ("fork");
 354       fail ("fork");
 355       return;
 356     }
 357
 358   if (child)
 359     {
 360       int status;
 361       /* parent */
 362       server ();
 363       wait (&status);
 364     }
 365   else
 366     client ();
 367 }