tests/resume.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 static void wrap_db_init (void);
  47 static void wrap_db_deinit (void);
  48 static int wrap_db_store (void *dbf, gnutls_datum_t key, gnutls_datum_t data);
  49 static gnutls_datum_t wrap_db_fetch (void *dbf, gnutls_datum_t key);
  50 static int wrap_db_delete (void *dbf, gnutls_datum_t key);
  51
  52 #define TLS_SESSION_CACHE 50
  53
  54 struct params_res
  55 {
  56   const char *desc;
  57   int enable_db;
  58   int enable_session_ticket_server;
  59   int enable_session_ticket_client;
  60   int expect_resume;
  61 };
  62
  63 pid_t child;
  64
  65 struct params_res resume_tests[] = {
  66   {"try to resume from db", 50, 0, 0, 1},
  67   {"try to resume from session ticket", 0, 1, 1, 1},
  68   {"try to resume from session ticket (server only)", 0, 1, 0, 0},
  69   {"try to resume from session ticket (client only)", 0, 0, 1, 0},
  70   {NULL, -1}
  71 };
  72
  73 /* A very basic TLS client, with anonymous authentication.
  74  */
  75
  76 #define MAX_BUF 5*1024
  77 #define MSG "Hello TLS"
  78
  79 static void
  80 tls_log_func (int level, const char *str)
  81 {
  82   fprintf (stderr, "%s |<%d>| %s", child ? "server" : "client", level, str);
  83 }
  84
  85 static void
  86 client (struct params_res *params)
  87 {
  88   int ret, sd, ii;
  89   gnutls_session_t session;
  90   char buffer[MAX_BUF + 1];
  91   gnutls_anon_client_credentials_t anoncred;
  92   /* Need to enable anonymous KX specifically. */
  93
  94   /* variables used in session resuming
  95    */
  96   int t;
  97   gnutls_datum_t session_data;
  98
  99   if (debug)
 100     {
 101       gnutls_global_set_log_function (tls_log_func);
 102       gnutls_global_set_log_level (2);
 103     }
 104   gnutls_global_init ();
 105
 106   gnutls_anon_allocate_client_credentials (&anoncred);
 107
 108   for (t = 0; t < 2; t++)
 109     {                           /* connect 2 times to the server */
 110       /* connect to the peer
 111        */
 112       sd = tcp_connect ();
 113
 114       /* Initialize TLS session
 115        */
 116       gnutls_init (&session, GNUTLS_CLIENT);
 117
 118       /* Use default priorities */
 119       gnutls_priority_set_direct (session, "NONE:+VERS-TLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH", NULL);
 120
 121       /* put the anonymous credentials to the current session
 122        */
 123       gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
 124
 125       if (params->enable_session_ticket_client)
 126         gnutls_session_ticket_enable_client (session);
 127
 128       if (t > 0)
 129         {
 130           /* if this is not the first time we connect */
 131           gnutls_session_set_data (session, session_data.data,
 132                                    session_data.size);
 133           gnutls_free (session_data.data);
 134         }
 135
 136       gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 137
 138       /* Perform the TLS handshake
 139        */
 140       ret = gnutls_handshake (session);
 141
 142       if (ret < 0)
 143         {
 144           fail ("client: Handshake failed\n");
 145           gnutls_perror (ret);
 146           goto end;
 147         }
 148       else
 149         {
 150           if (debug)
 151             success ("client: Handshake was completed\n");
 152         }
 153
 154       if (t == 0)
 155         {                       /* the first time we connect */
 156           /* get the session data size */
 157           ret = gnutls_session_get_data2 (session, &session_data);
 158           if (ret < 0)
 159             fail ("Getting resume data failed\n");
 160         }
 161       else
 162         {                       /* the second time we connect */
 163
 164           /* check if we actually resumed the previous session */
 165           if (gnutls_session_is_resumed (session) != 0)
 166             {
 167               if (params->expect_resume)
 168                 {
 169                   if (debug)
 170                     success ("- Previous session was resumed\n");
 171                 }
 172               else
 173                 fail ("- Previous session was resumed\n");
 174             }
 175           else
 176             {
 177               if (params->expect_resume)
 178                 {
 179                   fail ("*** Previous session was NOT resumed\n");
 180                 }
 181               else
 182                 {
 183                   if (debug)
 184                     success
 185                       ("*** Previous session was NOT resumed (expected)\n");
 186                 }
 187             }
 188         }
 189
 190       gnutls_record_send (session, MSG, strlen (MSG));
 191
 192       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 193       if (ret == 0)
 194         {
 195           if (debug)
 196             success ("client: Peer has closed the TLS connection\n");
 197           goto end;
 198         }
 199       else if (ret < 0)
 200         {
 201           fail ("client: Error: %s\n", gnutls_strerror (ret));
 202           goto end;
 203         }
 204
 205       if (debug )
 206         {
 207           printf ("- Received %d bytes: ", ret);
 208           for (ii = 0; ii < ret; ii++)
 209             {
 210               fputc (buffer[ii], stdout);
 211             }
 212           fputs ("\n", stdout);
 213         }
 214
 215       gnutls_bye (session, GNUTLS_SHUT_RDWR);
 216
 217
 218       tcp_close (sd);
 219
 220       gnutls_deinit (session);
 221     }
 222
 223 end:
 224   gnutls_anon_free_client_credentials (anoncred);
 225 }
 226
 227 /* This is a sample TLS 1.0 echo server, for anonymous authentication only.
 228  */
 229
 230 #define SA struct sockaddr
 231 #define PORT 5556               /* listen to 5556 port */
 232 #define DH_BITS 1024
 233
 234 /* These are global */
 235 gnutls_anon_server_credentials_t anoncred;
 236 static gnutls_datum_t session_ticket_key = { NULL, 0 };
 237
 238 static gnutls_session_t
 239 initialize_tls_session (struct params_res *params)
 240 {
 241   gnutls_session_t session;
 242
 243   gnutls_init (&session, GNUTLS_SERVER);
 244
 245   /* avoid calling all the priority functions, since the defaults
 246    * are adequate.
 247    */
 248   gnutls_priority_set_direct (session, "NONE:+VERS-TLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH", NULL);
 249
 250   gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
 251
 252   gnutls_dh_set_prime_bits (session, DH_BITS);
 253
 254   if (params->enable_db)
 255     {
 256       gnutls_db_set_retrieve_function (session, wrap_db_fetch);
 257       gnutls_db_set_remove_function (session, wrap_db_delete);
 258       gnutls_db_set_store_function (session, wrap_db_store);
 259       gnutls_db_set_ptr (session, NULL);
 260     }
 261
 262   if (params->enable_session_ticket_server)
 263     gnutls_session_ticket_enable_server (session, &session_ticket_key);
 264
 265   return session;
 266 }
 267
 268 static gnutls_dh_params_t dh_params;
 269
 270 static int
 271 generate_dh_params (void)
 272 {
 273   const gnutls_datum_t p3 = { (void *) pkcs3, strlen (pkcs3) };
 274   /* Generate Diffie-Hellman parameters - for use with DHE
 275    * kx algorithms. These should be discarded and regenerated
 276    * once a day, once a week or once a month. Depending on the
 277    * security requirements.
 278    */
 279   gnutls_dh_params_init (&dh_params);
 280   return gnutls_dh_params_import_pkcs3 (dh_params, &p3, GNUTLS_X509_FMT_PEM);
 281 }
 282
 283 int err, listen_sd, i;
 284 int sd, ret;
 285 struct sockaddr_in sa_serv;
 286 struct sockaddr_in sa_cli;
 287 socklen_t client_len;
 288 char topbuf[512];
 289 gnutls_session_t session;
 290 char buffer[MAX_BUF + 1];
 291 int optval = 1;
 292
 293 static void
 294 global_start (void)
 295 {
 296   /* Socket operations
 297    */
 298   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 299   if (err == -1)
 300     {
 301       perror ("socket");
 302       fail ("server: socket failed\n");
 303       return;
 304     }
 305
 306   memset (&sa_serv, '\0', sizeof (sa_serv));
 307   sa_serv.sin_family = AF_INET;
 308   sa_serv.sin_addr.s_addr = INADDR_ANY;
 309   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 310
 311   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval,
 312               sizeof (int));
 313
 314   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 315   if (err == -1)
 316     {
 317       perror ("bind");
 318       fail ("server: bind failed\n");
 319       return;
 320     }
 321
 322   err = listen (listen_sd, 1024);
 323   if (err == -1)
 324     {
 325       perror ("listen");
 326       fail ("server: listen failed\n");
 327       return;
 328     }
 329
 330   if (debug)
 331     success ("server: ready. Listening to port '%d'.\n", PORT);
 332 }
 333
 334 static void
 335 global_stop (void)
 336 {
 337   if (debug)
 338     success ("global stop\n");
 339
 340   gnutls_anon_free_server_credentials (anoncred);
 341
 342   gnutls_dh_params_deinit (dh_params);
 343
 344   gnutls_global_deinit ();
 345
 346   shutdown (listen_sd, SHUT_RDWR);
 347 }
 348
 349 static void
 350 server (struct params_res *params)
 351 {
 352   size_t t;
 353
 354   /* this must be called once in the program, it is mostly for the server.
 355    */
 356   if (debug)
 357     {
 358       gnutls_global_set_log_function (tls_log_func);
 359       gnutls_global_set_log_level (2);
 360     }
 361
 362   gnutls_global_init ();
 363   gnutls_anon_allocate_server_credentials (&anoncred);
 364
 365   if (debug)
 366     success ("Launched, generating DH parameters...\n");
 367
 368   generate_dh_params ();
 369
 370   gnutls_anon_set_server_dh_params (anoncred, dh_params);
 371
 372   if (params->enable_db)
 373     {
 374       wrap_db_init ();
 375     }
 376
 377   if (params->enable_session_ticket_server)
 378     gnutls_session_ticket_key_generate (&session_ticket_key);
 379
 380   for (t = 0; t < 2; t++)
 381     {
 382       client_len = sizeof (sa_cli);
 383
 384       session = initialize_tls_session (params);
 385
 386       sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 387
 388       if (debug)
 389         success ("server: connection from %s, port %d\n",
 390                  inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 391                             sizeof (topbuf)), ntohs (sa_cli.sin_port));
 392
 393       gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 394       ret = gnutls_handshake (session);
 395       if (ret < 0)
 396         {
 397           close (sd);
 398           gnutls_deinit (session);
 399           fail ("server: Handshake has failed (%s)\n\n",
 400                 gnutls_strerror (ret));
 401           return;
 402         }
 403       if (debug)
 404         success ("server: Handshake was completed\n");
 405
 406       /* see the Getting peer's information example */
 407       /* print_info(session); */
 408
 409       i = 0;
 410       for (;;)
 411         {
 412           memset (buffer, 0, MAX_BUF + 1);
 413           ret = gnutls_record_recv (session, buffer, MAX_BUF);
 414
 415           if (ret == 0)
 416             {
 417               if (debug)
 418                 success ("server: Peer has closed the GnuTLS connection\n");
 419               break;
 420             }
 421           else if (ret < 0)
 422             {
 423               fail ("server: Received corrupted data(%d). Closing...\n", ret);
 424               break;
 425             }
 426           else if (ret > 0)
 427             {
 428               /* echo data back to the client
 429                */
 430               gnutls_record_send (session, buffer, strlen (buffer));
 431             }
 432         }
 433       /* do not wait for the peer to close the connection.
 434        */
 435       gnutls_bye (session, GNUTLS_SHUT_WR);
 436
 437       close (sd);
 438
 439       gnutls_deinit (session);
 440     }
 441
 442   close (listen_sd);
 443
 444   if (params->enable_db)
 445     {
 446       wrap_db_deinit ();
 447     }
 448
 449   gnutls_free (session_ticket_key.data);
 450   session_ticket_key.data = NULL;
 451
 452   if (debug)
 453     success ("server: finished\n");
 454 }
 455
 456 void
 457 doit (void)
 458 {
 459   int i;
 460
 461   for (i = 0; resume_tests[i].desc; i++)
 462     {
 463       printf ("%s\n", resume_tests[i].desc);
 464
 465       global_start ();
 466       if (error_count)
 467         return;
 468
 469       child = fork ();
 470       if (child < 0)
 471         {
 472           perror ("fork");
 473           fail ("fork");
 474           return;
 475         }
 476
 477       if (child)
 478         {
 479           int status;
 480           /* parent */
 481           server (&resume_tests[i]);
 482           wait (&status);
 483           if (WEXITSTATUS(status) > 0)
 484             error_count++;
 485           global_stop ();
 486         }
 487       else
 488         {
 489           client (&resume_tests[i]);
 490           gnutls_global_deinit ();
 491           if (error_count)
 492             exit(1);
 493           exit (0);
 494         }
 495     }
 496 }
 497
 498 /* Functions and other stuff needed for session resuming.
 499  * This is done using a very simple list which holds session ids
 500  * and session data.
 501  */
 502
 503 #define MAX_SESSION_ID_SIZE 32
 504 #define MAX_SESSION_DATA_SIZE 1024
 505
 506 typedef struct
 507 {
 508   unsigned char session_id[MAX_SESSION_ID_SIZE];
 509   unsigned int session_id_size;
 510
 511   char session_data[MAX_SESSION_DATA_SIZE];
 512   int session_data_size;
 513 } CACHE;
 514
 515 static CACHE *cache_db;
 516 static int cache_db_ptr = 0;
 517
 518 static void
 519 wrap_db_init (void)
 520 {
 521
 522   /* allocate cache_db */
 523   cache_db = calloc (1, TLS_SESSION_CACHE * sizeof (CACHE));
 524 }
 525
 526 static void
 527 wrap_db_deinit (void)
 528 {
 529   free (cache_db);
 530   cache_db = NULL;
 531   return;
 532 }
 533
 534 static int
 535 wrap_db_store (void *dbf, gnutls_datum_t key, gnutls_datum_t data)
 536 {
 537   if (debug)
 538     {
 539       unsigned int i;
 540       fprintf (stderr, "resume db storing (%d-%d): ", key.size, data.size);
 541       for (i = 0; i < key.size; i++)
 542         {
 543           fprintf (stderr, "%02x", key.data[i] & 0xFF);
 544         }
 545       fprintf (stderr, "\n");
 546       fprintf (stderr, "data: ");
 547       for (i = 0; i < data.size; i++)
 548         {
 549           fprintf (stderr, "%02x", data.data[i] & 0xFF);
 550         }
 551       fprintf (stderr, "\n");
 552     }
 553
 554   if (cache_db == NULL)
 555     return -1;
 556
 557   if (key.size > MAX_SESSION_ID_SIZE)
 558     {
 559       fail("Key size is too large\n");
 560       return -1;
 561     }
 562
 563   if (data.size > MAX_SESSION_DATA_SIZE)
 564     {
 565       fail("Data size is too large\n");
 566       return -1;
 567     }
 568
 569   memcpy (cache_db[cache_db_ptr].session_id, key.data, key.size);
 570   cache_db[cache_db_ptr].session_id_size = key.size;
 571
 572   memcpy (cache_db[cache_db_ptr].session_data, data.data, data.size);
 573   cache_db[cache_db_ptr].session_data_size = data.size;
 574
 575   cache_db_ptr++;
 576   cache_db_ptr %= TLS_SESSION_CACHE;
 577
 578   return 0;
 579 }
 580
 581 static gnutls_datum_t
 582 wrap_db_fetch (void *dbf, gnutls_datum_t key)
 583 {
 584   gnutls_datum_t res = { NULL, 0 };
 585   int i;
 586
 587   if (debug)
 588     {
 589       unsigned int i;
 590
 591       fprintf (stderr, "resume db looking for (%d): ", key.size);
 592       for (i = 0; i < key.size; i++)
 593         {
 594           fprintf (stderr, "%02x", key.data[i] & 0xFF);
 595         }
 596       fprintf (stderr, "\n");
 597     }
 598
 599   if (cache_db == NULL)
 600     return res;
 601
 602   for (i = 0; i < TLS_SESSION_CACHE; i++)
 603     {
 604       if (key.size == cache_db[i].session_id_size &&
 605           memcmp (key.data, cache_db[i].session_id, key.size) == 0)
 606         {
 607           if (debug)
 608             success ("resume db fetch... return info\n");
 609
 610           res.size = cache_db[i].session_data_size;
 611
 612           res.data = gnutls_malloc (res.size);
 613           if (res.data == NULL)
 614             return res;
 615
 616           memcpy (res.data, cache_db[i].session_data, res.size);
 617
 618           if (debug)
 619             {
 620               unsigned int i;
 621               printf ("data:\n");
 622               for (i = 0; i < res.size; i++)
 623                 {
 624                   printf ("%02x ", res.data[i] & 0xFF);
 625                   if ((i + 1) % 16 == 0)
 626                     printf ("\n");
 627                 }
 628               printf ("\n");
 629             }
 630
 631           return res;
 632         }
 633     }
 634
 635   if (debug)
 636     success ("resume db fetch... NOT FOUND\n");
 637   return res;
 638 }
 639
 640 static int
 641 wrap_db_delete (void *dbf, gnutls_datum_t key)
 642 {
 643   int i;
 644
 645   if (cache_db == NULL)
 646     return -1;
 647
 648   for (i = 0; i < TLS_SESSION_CACHE; i++)
 649     {
 650       if (key.size == cache_db[i].session_id_size &&
 651           memcmp (key.data, cache_db[i].session_id, key.size) == 0)
 652         {
 653
 654           cache_db[i].session_id_size = 0;
 655           cache_db[i].session_data_size = 0;
 656
 657           return 0;
 658         }
 659     }
 660
 661   return -1;
 662
 663 }