tests/resume.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010 Free Software
   3  * Foundation, Inc.
   4  *
   5  * Author: Simon Josefsson
   6  *
   7  * This file is part of GnuTLS.
   8  *
   9  * GnuTLS is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * GnuTLS is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with GnuTLS; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  22  */
  23
  24 /* Parts copied from GnuTLS example programs. */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include <config.h>
  28 #endif
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <sys/types.h>
  34 #include <sys/socket.h>
  35 #include <sys/wait.h>
  36 #include <netinet/in.h>
  37 #include <arpa/inet.h>
  38 #include <unistd.h>
  39 #include <gnutls/gnutls.h>
  40
  41 #include "tcp.c"
  42
  43 #include "utils.h"
  44
  45 static void wrap_db_init (void);
  46 static void wrap_db_deinit (void);
  47 static int wrap_db_store (void *dbf, gnutls_datum_t key, gnutls_datum_t data);
  48 static gnutls_datum_t wrap_db_fetch (void *dbf, gnutls_datum_t key);
  49 static int wrap_db_delete (void *dbf, gnutls_datum_t key);
  50
  51 #define TLS_SESSION_CACHE 50
  52
  53 struct params_res
  54 {
  55   const char *desc;
  56   int enable_db;
  57   int enable_session_ticket_server;
  58   int enable_session_ticket_client;
  59   int expect_resume;
  60 };
  61
  62 pid_t child;
  63
  64 struct params_res resume_tests[] = {
  65   {"try to resume from db", 50, 0, 0, 1},
  66 #ifdef ENABLE_SESSION_TICKET
  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 #endif
  71   {NULL, -1}
  72 };
  73
  74 /* A very basic TLS client, with anonymous authentication.
  75  */
  76
  77 #define MAX_BUF 1024
  78 #define MSG "Hello TLS"
  79
  80 static void
  81 tls_log_func (int level, const char *str)
  82 {
  83   fprintf (stderr, "%s |<%d>| %s", child ? "server" : "client", level, str);
  84 }
  85
  86 static void
  87 client (struct params_res *params)
  88 {
  89   int ret, sd, ii;
  90   gnutls_session_t session;
  91   char buffer[MAX_BUF + 1];
  92   gnutls_anon_client_credentials_t anoncred;
  93   /* Need to enable anonymous KX specifically. */
  94
  95   /* variables used in session resuming
  96    */
  97   int t;
  98   gnutls_datum_t session_data;
  99
 100   if (debug)
 101     {
 102       gnutls_global_set_log_function (tls_log_func);
 103       gnutls_global_set_log_level (2);
 104     }
 105   gnutls_global_init ();
 106
 107   gnutls_anon_allocate_client_credentials (&anoncred);
 108
 109   for (t = 0; t < 2; t++)
 110     {                           /* connect 2 times to the server */
 111       /* connect to the peer
 112        */
 113       sd = tcp_connect ();
 114
 115       /* Initialize TLS session
 116        */
 117       gnutls_init (&session, GNUTLS_CLIENT);
 118
 119       /* Use default priorities */
 120   gnutls_priority_set_direct (session, "NONE:+VERS-TLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH", NULL);
 121
 122       /* put the anonymous credentials to the current session
 123        */
 124       gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
 125
 126 #ifdef ENABLE_SESSION_TICKET
 127       if (params->enable_session_ticket_client)
 128         gnutls_session_ticket_enable_client (session);
 129 #endif
 130
 131       if (t > 0)
 132         {
 133           /* if this is not the first time we connect */
 134           gnutls_session_set_data (session, session_data.data,
 135                                    session_data.size);
 136           gnutls_free (session_data.data);
 137         }
 138
 139       gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 140
 141       /* Perform the TLS handshake
 142        */
 143       ret = gnutls_handshake (session);
 144
 145       if (ret < 0)
 146         {
 147           fail ("client: Handshake failed\n");
 148           gnutls_perror (ret);
 149           goto end;
 150         }
 151       else
 152         {
 153           if (debug)
 154             success ("client: Handshake was completed\n");
 155         }
 156
 157       if (t == 0)
 158         {                       /* the first time we connect */
 159           /* get the session data size */
 160           ret = gnutls_session_get_data2 (session, &session_data);
 161           if (ret < 0)
 162             fail ("Getting resume data failed\n");
 163         }
 164       else
 165         {                       /* the second time we connect */
 166
 167           /* check if we actually resumed the previous session */
 168           if (gnutls_session_is_resumed (session) != 0)
 169             {
 170               if (params->expect_resume)
 171                 {
 172                   if (debug)
 173                     success ("- Previous session was resumed\n");
 174                 }
 175               else
 176                 fail ("- Previous session was resumed\n");
 177             }
 178           else
 179             {
 180               if (params->expect_resume)
 181                 fail ("*** Previous session was NOT resumed\n");
 182               else
 183                 {
 184                   if (debug)
 185                     success
 186                       ("*** Previous session was NOT resumed (expected)\n");
 187                 }
 188             }
 189         }
 190
 191       gnutls_record_send (session, MSG, strlen (MSG));
 192
 193       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 194       if (ret == 0)
 195         {
 196           if (debug)
 197             success ("client: Peer has closed the TLS connection\n");
 198           goto end;
 199         }
 200       else if (ret < 0)
 201         {
 202           fail ("client: Error: %s\n", gnutls_strerror (ret));
 203           goto end;
 204         }
 205
 206       if (debug)
 207         {
 208           printf ("- Received %d bytes: ", ret);
 209           for (ii = 0; ii < ret; ii++)
 210             {
 211               fputc (buffer[ii], stdout);
 212             }
 213           fputs ("\n", stdout);
 214         }
 215
 216       gnutls_bye (session, GNUTLS_SHUT_RDWR);
 217
 218
 219       tcp_close (sd);
 220
 221       gnutls_deinit (session);
 222     }
 223
 224 end:
 225   gnutls_anon_free_client_credentials (anoncred);
 226 }
 227
 228 /* This is a sample TLS 1.0 echo server, for anonymous authentication only.
 229  */
 230
 231 #define SA struct sockaddr
 232 #define MAX_BUF 1024
 233 #define PORT 5556               /* listen to 5556 port */
 234 #define DH_BITS 1024
 235
 236 /* These are global */
 237 gnutls_anon_server_credentials_t anoncred;
 238 gnutls_datum_t session_ticket_key = { NULL, 0 };
 239
 240 static gnutls_session_t
 241 initialize_tls_session (struct params_res *params)
 242 {
 243   gnutls_session_t session;
 244
 245   gnutls_init (&session, GNUTLS_SERVER);
 246
 247   /* avoid calling all the priority functions, since the defaults
 248    * are adequate.
 249    */
 250   gnutls_priority_set_direct (session, "NONE:+VERS-TLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH", NULL);
 251
 252   gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
 253
 254   gnutls_dh_set_prime_bits (session, DH_BITS);
 255
 256   if (params->enable_db)
 257     {
 258       gnutls_db_set_retrieve_function (session, wrap_db_fetch);
 259       gnutls_db_set_remove_function (session, wrap_db_delete);
 260       gnutls_db_set_store_function (session, wrap_db_store);
 261       gnutls_db_set_ptr (session, NULL);
 262     }
 263 #ifdef ENABLE_SESSION_TICKET
 264   if (params->enable_session_ticket_server)
 265     gnutls_session_ticket_enable_server (session, &session_ticket_key);
 266 #endif
 267
 268   return session;
 269 }
 270
 271 static gnutls_dh_params_t dh_params;
 272
 273 static int
 274 generate_dh_params (void)
 275 {
 276   const gnutls_datum_t p3 = { (char *) pkcs3, strlen (pkcs3) };
 277   /* Generate Diffie-Hellman parameters - for use with DHE
 278    * kx algorithms. These should be discarded and regenerated
 279    * once a day, once a week or once a month. Depending on the
 280    * security requirements.
 281    */
 282   gnutls_dh_params_init (&dh_params);
 283   return gnutls_dh_params_import_pkcs3 (dh_params, &p3, GNUTLS_X509_FMT_PEM);
 284 }
 285
 286 int err, listen_sd, i;
 287 int sd, ret;
 288 struct sockaddr_in sa_serv;
 289 struct sockaddr_in sa_cli;
 290 int client_len;
 291 char topbuf[512];
 292 gnutls_session_t session;
 293 char buffer[MAX_BUF + 1];
 294 int optval = 1;
 295
 296 static void
 297 global_start (void)
 298 {
 299   /* Socket operations
 300    */
 301   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 302   if (err == -1)
 303     {
 304       perror ("socket");
 305       fail ("server: socket failed\n");
 306       return;
 307     }
 308
 309   memset (&sa_serv, '\0', sizeof (sa_serv));
 310   sa_serv.sin_family = AF_INET;
 311   sa_serv.sin_addr.s_addr = INADDR_ANY;
 312   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 313
 314   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval,
 315               sizeof (int));
 316
 317   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 318   if (err == -1)
 319     {
 320       perror ("bind");
 321       fail ("server: bind failed\n");
 322       return;
 323     }
 324
 325   err = listen (listen_sd, 1024);
 326   if (err == -1)
 327     {
 328       perror ("listen");
 329       fail ("server: listen failed\n");
 330       return;
 331     }
 332
 333   if (debug)
 334     success ("server: ready. Listening to port '%d'.\n", PORT);
 335 }
 336
 337 static void
 338 global_stop (void)
 339 {
 340   if (debug)
 341     success ("global stop\n");
 342
 343   gnutls_anon_free_server_credentials (anoncred);
 344
 345   gnutls_dh_params_deinit (dh_params);
 346
 347   gnutls_global_deinit ();
 348
 349   shutdown (listen_sd, SHUT_RDWR);
 350 }
 351
 352 static void
 353 server (struct params_res *params)
 354 {
 355   size_t t;
 356
 357   /* this must be called once in the program, it is mostly for the server.
 358    */
 359   if (debug)
 360     {
 361       gnutls_global_set_log_function (tls_log_func);
 362       gnutls_global_set_log_level (2);
 363     }
 364
 365   gnutls_global_init ();
 366   gnutls_anon_allocate_server_credentials (&anoncred);
 367
 368   if (debug)
 369     success ("Launched, generating DH parameters...\n");
 370
 371   generate_dh_params ();
 372
 373   gnutls_anon_set_server_dh_params (anoncred, dh_params);
 374
 375   if (params->enable_db)
 376     {
 377       wrap_db_init ();
 378     }
 379 #ifdef ENABLE_SESSION_TICKET
 380   if (params->enable_session_ticket_server)
 381     gnutls_session_ticket_key_generate (&session_ticket_key);
 382 #endif
 383
 384   for (t = 0; t < 2; t++)
 385     {
 386       client_len = sizeof (sa_cli);
 387
 388       session = initialize_tls_session (params);
 389
 390       sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 391
 392       if (debug)
 393         success ("server: connection from %s, port %d\n",
 394                  inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 395                             sizeof (topbuf)), ntohs (sa_cli.sin_port));
 396
 397       gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 398       ret = gnutls_handshake (session);
 399       if (ret < 0)
 400         {
 401           close (sd);
 402           gnutls_deinit (session);
 403           fail ("server: Handshake has failed (%s)\n\n",
 404                 gnutls_strerror (ret));
 405           return;
 406         }
 407       if (debug)
 408         success ("server: Handshake was completed\n");
 409
 410       /* see the Getting peer's information example */
 411       /* print_info(session); */
 412
 413       i = 0;
 414       for (;;)
 415         {
 416           memset (buffer, 0, MAX_BUF + 1);
 417           ret = gnutls_record_recv (session, buffer, MAX_BUF);
 418
 419           if (ret == 0)
 420             {
 421               if (debug)
 422                 success ("server: Peer has closed the GnuTLS connection\n");
 423               break;
 424             }
 425           else if (ret < 0)
 426             {
 427               fail ("server: Received corrupted data(%d). Closing...\n", ret);
 428               break;
 429             }
 430           else if (ret > 0)
 431             {
 432               /* echo data back to the client
 433                */
 434               gnutls_record_send (session, buffer, strlen (buffer));
 435             }
 436         }
 437       /* do not wait for the peer to close the connection.
 438        */
 439       gnutls_bye (session, GNUTLS_SHUT_WR);
 440
 441       close (sd);
 442
 443       gnutls_deinit (session);
 444     }
 445
 446   close (listen_sd);
 447
 448   if (params->enable_db)
 449     {
 450       wrap_db_deinit ();
 451     }
 452
 453   gnutls_free (session_ticket_key.data);
 454   session_ticket_key.data = NULL;
 455
 456   if (debug)
 457     success ("server: finished\n");
 458 }
 459
 460 void
 461 doit (void)
 462 {
 463   int i;
 464
 465   for (i = 0; resume_tests[i].desc; i++)
 466     {
 467       if (debug)
 468         printf ("%s\n", resume_tests[i].desc);
 469
 470       global_start ();
 471       if (error_count)
 472         return;
 473
 474       child = fork ();
 475       if (child < 0)
 476         {
 477           perror ("fork");
 478           fail ("fork");
 479           return;
 480         }
 481
 482       if (child)
 483         {
 484           int status;
 485           /* parent */
 486           server (&resume_tests[i]);
 487           wait (&status);
 488           global_stop ();
 489         }
 490       else
 491         {
 492           client (&resume_tests[i]);
 493           gnutls_global_deinit ();
 494           exit (0);
 495         }
 496     }
 497 }
 498
 499 /* Functions and other stuff needed for session resuming.
 500  * This is done using a very simple list which holds session ids
 501  * and session data.
 502  */
 503
 504 #define MAX_SESSION_ID_SIZE 32
 505 #define MAX_SESSION_DATA_SIZE 512
 506
 507 typedef struct
 508 {
 509   unsigned char session_id[MAX_SESSION_ID_SIZE];
 510   unsigned int session_id_size;
 511
 512   char session_data[MAX_SESSION_DATA_SIZE];
 513   int session_data_size;
 514 } CACHE;
 515
 516 static CACHE *cache_db;
 517 static int cache_db_ptr = 0;
 518
 519 static void
 520 wrap_db_init (void)
 521 {
 522
 523   /* allocate cache_db */
 524   cache_db = calloc (1, TLS_SESSION_CACHE * sizeof (CACHE));
 525 }
 526
 527 static void
 528 wrap_db_deinit (void)
 529 {
 530   free (cache_db);
 531   cache_db = NULL;
 532   return;
 533 }
 534
 535 static int
 536 wrap_db_store (void *dbf, gnutls_datum_t key, gnutls_datum_t data)
 537 {
 538   if (debug)
 539     success ("resume db storing... (%d-%d)\n", key.size, data.size);
 540
 541   if (debug)
 542     {
 543       unsigned int i;
 544       printf ("key:\n");
 545       for (i = 0; i < key.size; i++)
 546         {
 547           printf ("%02x ", key.data[i] & 0xFF);
 548           if ((i + 1) % 16 == 0)
 549             printf ("\n");
 550         }
 551       printf ("\n");
 552       printf ("data:\n");
 553       for (i = 0; i < data.size; i++)
 554         {
 555           printf ("%02x ", data.data[i] & 0xFF);
 556           if ((i + 1) % 16 == 0)
 557             printf ("\n");
 558         }
 559       printf ("\n");
 560     }
 561
 562   if (cache_db == NULL)
 563     return -1;
 564
 565   if (key.size > MAX_SESSION_ID_SIZE)
 566     return -1;
 567   if (data.size > MAX_SESSION_DATA_SIZE)
 568     return -1;
 569
 570   memcpy (cache_db[cache_db_ptr].session_id, key.data, key.size);
 571   cache_db[cache_db_ptr].session_id_size = key.size;
 572
 573   memcpy (cache_db[cache_db_ptr].session_data, data.data, data.size);
 574   cache_db[cache_db_ptr].session_data_size = data.size;
 575
 576   cache_db_ptr++;
 577   cache_db_ptr %= TLS_SESSION_CACHE;
 578
 579   return 0;
 580 }
 581
 582 static gnutls_datum_t
 583 wrap_db_fetch (void *dbf, gnutls_datum_t key)
 584 {
 585   gnutls_datum_t res = { NULL, 0 };
 586   int i;
 587
 588   if (debug)
 589     success ("resume db fetch... (%d)\n", key.size);
 590   if (debug)
 591     {
 592       unsigned int i;
 593       printf ("key:\n");
 594       for (i = 0; i < key.size; i++)
 595         {
 596           printf ("%02x ", key.data[i] & 0xFF);
 597           if ((i + 1) % 16 == 0)
 598             printf ("\n");
 599         }
 600       printf ("\n");
 601     }
 602
 603   if (cache_db == NULL)
 604     return res;
 605
 606   for (i = 0; i < TLS_SESSION_CACHE; i++)
 607     {
 608       if (key.size == cache_db[i].session_id_size &&
 609           memcmp (key.data, cache_db[i].session_id, key.size) == 0)
 610         {
 611           if (debug)
 612             success ("resume db fetch... return info\n");
 613
 614           res.size = cache_db[i].session_data_size;
 615
 616           res.data = gnutls_malloc (res.size);
 617           if (res.data == NULL)
 618             return res;
 619
 620           memcpy (res.data, cache_db[i].session_data, res.size);
 621
 622           if (debug)
 623             {
 624               unsigned int i;
 625               printf ("data:\n");
 626               for (i = 0; i < res.size; i++)
 627                 {
 628                   printf ("%02x ", res.data[i] & 0xFF);
 629                   if ((i + 1) % 16 == 0)
 630                     printf ("\n");
 631                 }
 632               printf ("\n");
 633             }
 634
 635           return res;
 636         }
 637     }
 638   return res;
 639 }
 640
 641 static int
 642 wrap_db_delete (void *dbf, gnutls_datum_t key)
 643 {
 644   int i;
 645
 646   if (cache_db == NULL)
 647     return -1;
 648
 649   for (i = 0; i < TLS_SESSION_CACHE; i++)
 650     {
 651       if (key.size == cache_db[i].session_id_size &&
 652           memcmp (key.data, cache_db[i].session_id, key.size) == 0)
 653         {
 654
 655           cache_db[i].session_id_size = 0;
 656           cache_db[i].session_data_size = 0;
 657
 658           return 0;
 659         }
 660     }
 661
 662   return -1;
 663
 664 }