src/cli.c

   1 /*
   2  * Copyright (C) 2000-2012 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GnuTLS.
   5  *
   6  * GnuTLS is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GnuTLS is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21
  22 #include <stdio.h>
  23 #include <errno.h>
  24 #include <stdlib.h>
  25 #include <sys/types.h>
  26 #include <string.h>
  27 #include <sys/time.h>
  28 #include <sys/stat.h>
  29 #if HAVE_SYS_SOCKET_H
  30 # include <sys/socket.h>
  31 #elif HAVE_WS2TCPIP_H
  32 # include <ws2tcpip.h>
  33 #endif
  34 #include <sys/select.h>
  35 #include <unistd.h>
  36 #include <stdint.h>
  37 #include <fcntl.h>
  38 #include <netdb.h>
  39 #include <ctype.h>
  40
  41 #include <gnutls/gnutls.h>
  42 #include <gnutls/abstract.h>
  43 #include <gnutls/dtls.h>
  44 #include <gnutls/x509.h>
  45 #include <gnutls/openpgp.h>
  46 #include <gnutls/pkcs11.h>
  47
  48 /* Gnulib portability files. */
  49 #include <progname.h>
  50 #include <version-etc.h>
  51 #include <read-file.h>
  52 #include <getpass.h>
  53 #include <minmax.h>
  54
  55 #include "sockets.h"
  56 #include "benchmark.h"
  57
  58 #ifdef HAVE_DANE
  59 #include <gnutls/dane.h>
  60 #endif
  61
  62 #include <common.h>
  63 #include <socket.h>
  64
  65 #include <cli-args.h>
  66 #include <ocsptool-common.h>
  67
  68 #define MAX_BUF 4096
  69
  70 /* global stuff here */
  71 int resume, starttls, insecure, rehandshake, udp, mtu;
  72 const char *hostname = NULL;
  73 const char *service = NULL;
  74 int record_max_size;
  75 int status_request_ocsp;
  76 int fingerprint;
  77 int crlf;
  78 unsigned int verbose = 0;
  79 int print_cert;
  80
  81 const char *srp_passwd = NULL;
  82 const char *srp_username = NULL;
  83 const char *pgp_keyfile = NULL;
  84 const char *pgp_certfile = NULL;
  85 const char *pgp_keyring = NULL;
  86 const char *x509_keyfile = NULL;
  87 const char *x509_certfile = NULL;
  88 const char *x509_cafile = NULL;
  89 const char *x509_crlfile = NULL;
  90 static int x509ctype;
  91 static int disable_extensions;
  92 static unsigned int init_flags = GNUTLS_CLIENT;
  93 static const char * priorities = NULL;
  94
  95 const char *psk_username = NULL;
  96 gnutls_datum_t psk_key = { NULL, 0 };
  97
  98 static gnutls_srp_client_credentials_t srp_cred;
  99 static gnutls_psk_client_credentials_t psk_cred;
 100 static gnutls_anon_client_credentials_t anon_cred;
 101 static gnutls_certificate_credentials_t xcred;
 102
 103 /* end of global stuff */
 104
 105 /* prototypes */
 106
 107 static void check_rehandshake (socket_st * socket, int ret);
 108 static int do_handshake (socket_st * socket);
 109 static void init_global_tls_stuff (void);
 110 static int cert_verify_ocsp (gnutls_session_t session);
 111
 112 #define MAX_CRT 6
 113 static unsigned int x509_crt_size;
 114 static gnutls_pcert_st x509_crt[MAX_CRT];
 115 static gnutls_privkey_t x509_key = NULL;
 116
 117 static gnutls_pcert_st pgp_crt;
 118 static gnutls_privkey_t pgp_key = NULL;
 119
 120 static void
 121 get_keyid (gnutls_openpgp_keyid_t keyid, const char *str)
 122 {
 123   size_t keyid_size = sizeof (keyid);
 124
 125   if (strlen (str) != 16)
 126     {
 127       fprintf (stderr,
 128                "The OpenPGP subkey ID has to be 16 hexadecimal characters.\n");
 129       exit (1);
 130     }
 131
 132   if (gnutls_hex2bin (str, strlen (str), keyid, &keyid_size) < 0)
 133     {
 134       fprintf (stderr, "Error converting hex string: %s.\n", str);
 135       exit (1);
 136     }
 137
 138   return;
 139 }
 140
 141 /* Load the certificate and the private key.
 142  */
 143 static void
 144 load_keys (void)
 145 {
 146   unsigned int crt_num;
 147   int ret;
 148   unsigned int i;
 149   gnutls_datum_t data = { NULL, 0 };
 150   gnutls_x509_crt_t crt_list[MAX_CRT];
 151   unsigned char keyid[GNUTLS_OPENPGP_KEYID_SIZE];
 152
 153   if (x509_certfile != NULL && x509_keyfile != NULL)
 154     {
 155 #ifdef ENABLE_PKCS11
 156       if (strncmp (x509_certfile, "pkcs11:", 7) == 0)
 157         {
 158           crt_num = 1;
 159           gnutls_x509_crt_init (&crt_list[0]);
 160           gnutls_x509_crt_set_pin_function(crt_list[0], pin_callback, NULL);
 161
 162           ret =
 163             gnutls_x509_crt_import_pkcs11_url (crt_list[0], x509_certfile, 0);
 164
 165           if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
 166             ret =
 167               gnutls_x509_crt_import_pkcs11_url (crt_list[0], x509_certfile,
 168                                                  GNUTLS_PKCS11_OBJ_FLAG_LOGIN);
 169
 170           if (ret < 0)
 171             {
 172               fprintf (stderr, "*** Error loading cert file.\n");
 173               exit (1);
 174             }
 175           x509_crt_size = 1;
 176         }
 177       else
 178 #endif /* ENABLE_PKCS11 */
 179         {
 180
 181           ret = gnutls_load_file (x509_certfile, &data);
 182           if (ret < 0)
 183             {
 184               fprintf (stderr, "*** Error loading cert file.\n");
 185               exit (1);
 186             }
 187
 188           crt_num = MAX_CRT;
 189           ret =
 190             gnutls_x509_crt_list_import (crt_list, &crt_num, &data,
 191                                          x509ctype,
 192                                          GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
 193           if (ret < 0)
 194             {
 195               if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER)
 196                 {
 197                   fprintf (stderr,
 198                            "*** Error loading cert file: Too many certs %d\n",
 199                            crt_num);
 200
 201                 }
 202               else
 203                 {
 204                   fprintf (stderr,
 205                            "*** Error loading cert file: %s\n",
 206                            gnutls_strerror (ret));
 207                 }
 208               exit (1);
 209             }
 210           x509_crt_size = ret;
 211         }
 212
 213       for (i=0;i<x509_crt_size;i++)
 214         {
 215           ret = gnutls_pcert_import_x509(&x509_crt[i], crt_list[i], 0);
 216           if (ret < 0)
 217             {
 218               fprintf(stderr, "*** Error importing crt to pcert: %s\n",
 219                 gnutls_strerror(ret));
 220               exit(1);
 221             }
 222           gnutls_x509_crt_deinit(crt_list[i]);
 223         }
 224
 225       gnutls_free (data.data);
 226
 227       ret = gnutls_privkey_init(&x509_key);
 228       if (ret < 0)
 229          {
 230            fprintf (stderr, "*** Error initializing key: %s\n",
 231                     gnutls_strerror (ret));
 232            exit (1);
 233          }
 234
 235       gnutls_privkey_set_pin_function(x509_key, pin_callback, NULL);
 236
 237       if (gnutls_url_is_supported(x509_keyfile) != 0)
 238         {
 239           ret =
 240             gnutls_privkey_import_url (x509_key, x509_keyfile, 0);
 241           if (ret < 0)
 242             {
 243               fprintf (stderr, "*** Error loading url: %s\n",
 244                        gnutls_strerror (ret));
 245               exit (1);
 246             }
 247         }
 248       else
 249         {
 250           ret = gnutls_load_file (x509_keyfile, &data);
 251           if (ret < 0)
 252             {
 253               fprintf (stderr, "*** Error loading key file.\n");
 254               exit (1);
 255             }
 256
 257           ret = gnutls_privkey_import_x509_raw( x509_key, &data, x509ctype, NULL, 0);
 258           if (ret < 0)
 259             {
 260               fprintf (stderr, "*** Error loading url: %s\n",
 261                        gnutls_strerror (ret));
 262               exit (1);
 263             }
 264
 265           gnutls_free(data.data);
 266         }
 267
 268       fprintf (stdout, "Processed %d client X.509 certificates...\n",
 269                x509_crt_size);
 270     }
 271
 272
 273 #ifdef ENABLE_OPENPGP
 274   if (HAVE_OPT(PGPSUBKEY))
 275     {
 276       get_keyid (keyid, OPT_ARG(PGPSUBKEY));
 277     }
 278
 279   if (pgp_certfile != NULL && pgp_keyfile != NULL)
 280     {
 281       gnutls_openpgp_crt_t tmp_pgp_crt;
 282
 283       ret = gnutls_load_file (pgp_certfile, &data);
 284       if (ret < 0)
 285         {
 286           fprintf (stderr, "*** Error loading PGP cert file.\n");
 287           exit (1);
 288         }
 289
 290       gnutls_openpgp_crt_init (&tmp_pgp_crt);
 291
 292       ret =
 293         gnutls_pcert_import_openpgp_raw (&pgp_crt, &data, GNUTLS_OPENPGP_FMT_BASE64, HAVE_OPT(PGPSUBKEY)?keyid:NULL, 0);
 294       if (ret < 0)
 295         {
 296           fprintf (stderr,
 297                    "*** Error loading PGP cert file: %s\n",
 298                    gnutls_strerror (ret));
 299           exit (1);
 300         }
 301
 302       gnutls_free (data.data);
 303
 304       ret = gnutls_privkey_init(&pgp_key);
 305       if (ret < 0)
 306          {
 307            fprintf (stderr, "*** Error initializing key: %s\n",
 308                     gnutls_strerror (ret));
 309            exit (1);
 310          }
 311
 312       gnutls_privkey_set_pin_function(pgp_key, pin_callback, NULL);
 313
 314       if (gnutls_url_is_supported (pgp_keyfile))
 315         {
 316           ret = gnutls_privkey_import_url( pgp_key, pgp_keyfile, 0);
 317           if (ret < 0)
 318             {
 319               fprintf (stderr, "*** Error loading url: %s\n",
 320                        gnutls_strerror (ret));
 321               exit (1);
 322             }
 323         }
 324       else
 325         {
 326           ret = gnutls_load_file (pgp_keyfile, &data);
 327           if (ret < 0)
 328             {
 329               fprintf (stderr, "*** Error loading key file.\n");
 330               exit (1);
 331             }
 332
 333           if (HAVE_OPT(PGPSUBKEY))
 334             ret = gnutls_privkey_import_openpgp_raw( pgp_key, &data, x509ctype, keyid, NULL);
 335           else
 336             ret = gnutls_privkey_import_openpgp_raw( pgp_key, &data, x509ctype, NULL, NULL);
 337           if (ret < 0)
 338             {
 339               fprintf (stderr, "*** Error loading url: %s\n",
 340                        gnutls_strerror (ret));
 341               exit (1);
 342             }
 343
 344           gnutls_free(data.data);
 345         }
 346
 347
 348       fprintf (stdout, "Processed 1 client PGP certificate...\n");
 349     }
 350 #endif
 351
 352 }
 353
 354 #define IS_NEWLINE(x) ((x[0] == '\n') || (x[0] == '\r'))
 355 static int
 356 read_yesno (const char *input_str)
 357 {
 358   char input[128];
 359
 360   fputs (input_str, stderr);
 361   if (fgets (input, sizeof (input), stdin) == NULL)
 362     return 0;
 363
 364   if (IS_NEWLINE(input))
 365     return 0;
 366
 367   if (input[0] == 'y' || input[0] == 'Y')
 368     return 1;
 369
 370   return 0;
 371 }
 372
 373 /* converts a textual service or port to
 374  * a service.
 375  */
 376 static const char* port_to_service(const char* sport)
 377 {
 378 unsigned int port;
 379 struct servent * sr;
 380
 381   port = atoi(sport);
 382   if (port == 0) return sport;
 383
 384   port = htons(port);
 385
 386   sr = getservbyport(port, udp?"udp":"tcp");
 387   if (sr == NULL)
 388     {
 389       fprintf(stderr, "Warning: getservbyport() failed. Using port number as service.\n");
 390       return sport;
 391     }
 392
 393   return sr->s_name;
 394 }
 395
 396 static int
 397 cert_verify_callback (gnutls_session_t session)
 398 {
 399   int rc;
 400   unsigned int status = 0;
 401   int ssh = ENABLED_OPT(TOFU);
 402 #ifdef HAVE_DANE
 403   int dane = ENABLED_OPT(DANE);
 404 #endif
 405   int ca_verify = ENABLED_OPT(CA_VERIFICATION);
 406   const char* txt_service;
 407
 408   print_cert_info (session, verbose, print_cert);
 409
 410   if (ca_verify)
 411     {
 412       rc = cert_verify(session, hostname);
 413       if (rc == 0)
 414         {
 415           printf ("*** Verifying server certificate failed...\n");
 416           if (!insecure && !ssh)
 417             return -1;
 418         }
 419       else if (ENABLED_OPT(OCSP))
 420         { /* off-line verification succeeded. Try OCSP */
 421           rc = cert_verify_ocsp(session);
 422           if (rc == 0)
 423             {
 424               printf ("*** Verifying (with OCSP) server certificate failed...\n");
 425               if (!insecure && !ssh)
 426                 return -1;
 427             }
 428           else if (rc == -1)
 429             printf("*** OCSP response ignored\n");
 430         }
 431     }
 432
 433   if (ssh) /* try ssh auth */
 434     {
 435       unsigned int list_size;
 436       const gnutls_datum_t * cert;
 437
 438       cert = gnutls_certificate_get_peers(session, &list_size);
 439       if (cert == NULL)
 440         {
 441           fprintf(stderr, "Cannot obtain peer's certificate!\n");
 442           return -1;
 443         }
 444
 445       txt_service = port_to_service(service);
 446
 447       rc = gnutls_verify_stored_pubkey(NULL, NULL, hostname, txt_service,
 448                                        GNUTLS_CRT_X509, cert, 0);
 449       if (rc == GNUTLS_E_NO_CERTIFICATE_FOUND)
 450         {
 451           print_cert_info_compact(session);
 452           fprintf(stderr, "Host %s (%s) has never been contacted before.\n", hostname, txt_service);
 453           if (status == 0)
 454             fprintf(stderr, "Its certificate is valid for %s.\n", hostname);
 455
 456           rc = read_yesno("Are you sure you want to trust it? (y/N): ");
 457           if (rc == 0)
 458             return -1;
 459         }
 460       else if (rc == GNUTLS_E_CERTIFICATE_KEY_MISMATCH)
 461         {
 462           print_cert_info_compact(session);
 463           fprintf(stderr, "Warning: host %s is known and it is associated with a different key.\n", hostname);
 464           fprintf(stderr, "It might be that the server has multiple keys, or an attacker replaced the key to eavesdrop this connection .\n");
 465           if (status == 0)
 466             fprintf(stderr, "Its certificate is valid for %s.\n", hostname);
 467
 468           rc = read_yesno("Do you trust the received key? (y/N): ");
 469           if (rc == 0)
 470             return -1;
 471         }
 472       else if (rc < 0)
 473         {
 474           fprintf(stderr, "gnutls_verify_stored_pubkey: %s\n", gnutls_strerror(rc));
 475           return -1;
 476         }
 477
 478       if (rc != 0)
 479         {
 480           rc = gnutls_store_pubkey(NULL, NULL, hostname, txt_service,
 481                                    GNUTLS_CRT_X509, cert, 0, 0);
 482           if (rc < 0)
 483             fprintf(stderr, "Could not store key: %s\n", gnutls_strerror(rc));
 484         }
 485     }
 486
 487 #ifdef HAVE_DANE
 488   if (dane) /* try DANE auth */
 489     {
 490       unsigned int sflags = ENABLED_OPT(LOCAL_DNS)?0:DANE_F_IGNORE_LOCAL_RESOLVER;
 491       rc = dane_verify_session_crt( NULL, session, hostname, udp?"udp":"tcp", atoi(service),
 492                                     sflags, 0, &status);
 493       if (rc < 0)
 494         {
 495           fprintf(stderr, "*** DANE verification error: %s\n", dane_strerror(rc));
 496           if (!insecure)
 497             return -1;
 498         }
 499       else
 500         {
 501           gnutls_datum_t out;
 502
 503           rc = dane_verification_status_print( status, &out, 0);
 504           if (rc < 0)
 505             {
 506               fprintf(stderr, "*** DANE error: %s\n", dane_strerror(rc));
 507               if (!insecure)
 508                 return -1;
 509             }
 510
 511           fprintf(stderr, "- %s\n", out.data);
 512           gnutls_free(out.data);
 513         }
 514
 515     }
 516 #endif
 517
 518   return 0;
 519 }
 520
 521 /* This callback should be associated with a session by calling
 522  * gnutls_certificate_client_set_retrieve_function( session, cert_callback),
 523  * before a handshake.
 524  */
 525
 526 static int
 527 cert_callback (gnutls_session_t session,
 528                const gnutls_datum_t * req_ca_rdn, int nreqs,
 529                const gnutls_pk_algorithm_t * sign_algos,
 530                int sign_algos_length, gnutls_pcert_st **pcert,
 531                unsigned int *pcert_length, gnutls_privkey_t * pkey)
 532 {
 533   char issuer_dn[256];
 534   int i, ret, cert_type;
 535   size_t len;
 536
 537   if (verbose)
 538     {
 539       /* Print the server's trusted CAs
 540        */
 541       if (nreqs > 0)
 542         printf ("- Server's trusted authorities:\n");
 543       else
 544         printf ("- Server did not send us any trusted authorities names.\n");
 545
 546       /* print the names (if any) */
 547       for (i = 0; i < nreqs; i++)
 548         {
 549           len = sizeof (issuer_dn);
 550           ret = gnutls_x509_rdn_get (&req_ca_rdn[i], issuer_dn, &len);
 551           if (ret >= 0)
 552             {
 553               printf ("   [%d]: ", i);
 554               printf ("%s\n", issuer_dn);
 555             }
 556         }
 557     }
 558
 559   /* Select a certificate and return it.
 560    * The certificate must be of any of the "sign algorithms"
 561    * supported by the server.
 562    */
 563
 564   cert_type = gnutls_certificate_type_get (session);
 565
 566   *pcert_length = 0;
 567
 568   if (cert_type == GNUTLS_CRT_X509)
 569     {
 570       if (x509_crt_size > 0)
 571         {
 572           if (x509_key != NULL)
 573             {
 574               *pkey = x509_key;
 575             }
 576           else
 577             {
 578               printf ("- Could not find a suitable key to send to server\n");
 579               return -1;
 580             }
 581
 582           *pcert_length = x509_crt_size;
 583           *pcert = x509_crt;
 584         }
 585
 586     }
 587   else if (cert_type == GNUTLS_CRT_OPENPGP)
 588     {
 589       if (pgp_key != NULL)
 590         {
 591           *pkey = pgp_key;
 592
 593           *pcert_length = 1;
 594           *pcert = &pgp_crt;
 595         }
 596     }
 597
 598   printf ("- Successfully sent %u certificate(s) to server.\n", *pcert_length);
 599   return 0;
 600
 601 }
 602
 603 /* initializes a gnutls_session_t with some defaults.
 604  */
 605 static gnutls_session_t
 606 init_tls_session (const char *hostname)
 607 {
 608   const char *err;
 609   int ret;
 610   gnutls_session_t session;
 611
 612   if (priorities == NULL)
 613     priorities = "NORMAL";
 614
 615   if (udp)
 616     {
 617       gnutls_init (&session, GNUTLS_DATAGRAM|init_flags);
 618       if (mtu)
 619         gnutls_dtls_set_mtu(session, mtu);
 620     }
 621   else
 622     gnutls_init (&session, init_flags);
 623
 624   if ((ret = gnutls_priority_set_direct (session, priorities, &err)) < 0)
 625     {
 626       if (ret == GNUTLS_E_INVALID_REQUEST) fprintf (stderr, "Syntax error at: %s\n", err);
 627       else
 628         fprintf(stderr, "Error in priorities: %s\n", gnutls_strerror(ret));
 629       exit (1);
 630     }
 631
 632   /* allow the use of private ciphersuites.
 633    */
 634   if (disable_extensions == 0)
 635     {
 636       if (!isdigit(hostname[0]) && strchr(hostname, ':') == 0)
 637         gnutls_server_name_set (session, GNUTLS_NAME_DNS, hostname,
 638                                 strlen (hostname));
 639     }
 640
 641   if (HAVE_OPT(DH_BITS))
 642     gnutls_dh_set_prime_bits( session, OPT_VALUE_DH_BITS);
 643
 644   gnutls_credentials_set (session, GNUTLS_CRD_ANON, anon_cred);
 645   if (srp_cred)
 646     gnutls_credentials_set (session, GNUTLS_CRD_SRP, srp_cred);
 647   if (psk_cred)
 648     gnutls_credentials_set (session, GNUTLS_CRD_PSK, psk_cred);
 649   gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, xcred);
 650
 651   gnutls_certificate_set_retrieve_function2 (xcred, cert_callback);
 652   gnutls_certificate_set_verify_function (xcred, cert_verify_callback);
 653
 654   /* send the fingerprint */
 655 #ifdef ENABLE_OPENPGP
 656   if (fingerprint != 0)
 657     gnutls_openpgp_send_cert (session, GNUTLS_OPENPGP_CERT_FINGERPRINT);
 658 #endif
 659
 660   /* use the max record size extension */
 661   if (record_max_size > 0 && disable_extensions == 0)
 662     {
 663       if (gnutls_record_set_max_size (session, record_max_size) < 0)
 664         {
 665           fprintf (stderr,
 666                    "Cannot set the maximum record size to %d.\n",
 667                    record_max_size);
 668           fprintf (stderr, "Possible values: 512, 1024, 2048, 4096.\n");
 669           exit (1);
 670         }
 671     }
 672
 673   if (HAVE_OPT(HEARTBEAT))
 674     gnutls_heartbeat_enable (session, GNUTLS_HB_PEER_ALLOWED_TO_SEND);
 675
 676   if (HAVE_OPT(SRTP_PROFILES))
 677     {
 678       ret = gnutls_srtp_set_profile_direct (session, OPT_ARG(SRTP_PROFILES), &err);
 679       if (ret == GNUTLS_E_INVALID_REQUEST) fprintf (stderr, "Syntax error at: %s\n", err);
 680       else
 681         fprintf(stderr, "Error in profiles: %s\n", gnutls_strerror(ret));
 682       exit (1);
 683     }
 684
 685   return session;
 686 }
 687
 688 static void cmd_parser (int argc, char **argv);
 689
 690 /* Returns zero if the error code was successfully handled.
 691  */
 692 static int
 693 handle_error (socket_st * hd, int err)
 694 {
 695   int alert, ret;
 696   const char *err_type, *str;
 697
 698   if (err >= 0 || err == GNUTLS_E_AGAIN || err == GNUTLS_E_INTERRUPTED)
 699     return 0;
 700
 701   if (gnutls_error_is_fatal (err) == 0)
 702     {
 703       ret = 0;
 704       err_type = "Non fatal";
 705     }
 706   else
 707     {
 708       ret = err;
 709       err_type = "Fatal";
 710     }
 711
 712   str = gnutls_strerror (err);
 713   if (str == NULL)
 714     str = str_unknown;
 715   fprintf (stderr, "*** %s error: %s\n", err_type, str);
 716
 717   if (err == GNUTLS_E_WARNING_ALERT_RECEIVED
 718       || err == GNUTLS_E_FATAL_ALERT_RECEIVED)
 719     {
 720       alert = gnutls_alert_get (hd->session);
 721       str = gnutls_alert_get_name (alert);
 722       if (str == NULL)
 723         str = str_unknown;
 724       printf ("*** Received alert [%d]: %s\n", alert, str);
 725     }
 726
 727   check_rehandshake (hd, err);
 728
 729   return ret;
 730 }
 731
 732 int starttls_alarmed = 0;
 733
 734 #ifndef _WIN32
 735 static void
 736 starttls_alarm (int signum)
 737 {
 738   starttls_alarmed = 1;
 739 }
 740 #endif
 741
 742 static void
 743 tls_log_func (int level, const char *str)
 744 {
 745   fprintf (stderr, "|<%d>| %s", level, str);
 746 }
 747
 748 #define IN_KEYBOARD 1
 749 #define IN_NET 2
 750 #define IN_NONE 0
 751 /* returns IN_KEYBOARD for keyboard input and IN_NET for network input
 752  */
 753 static int check_net_or_keyboard_input(socket_st* hd)
 754 {
 755   int maxfd;
 756   fd_set rset;
 757   int err;
 758   struct timeval tv;
 759
 760   do
 761     {
 762       FD_ZERO (&rset);
 763       FD_SET (hd->fd, &rset);
 764
 765 #ifndef _WIN32
 766       FD_SET (fileno (stdin), &rset);
 767       maxfd = MAX (fileno (stdin), hd->fd);
 768 #else
 769       maxfd = hd->fd;
 770 #endif
 771
 772       tv.tv_sec = 0;
 773       tv.tv_usec = 50 * 1000;
 774
 775       if (hd->secure == 1)
 776         if (gnutls_record_check_pending(hd->session))
 777           return IN_NET;
 778
 779       err = select (maxfd + 1, &rset, NULL, NULL, &tv);
 780       if (err < 0)
 781         continue;
 782
 783       if (FD_ISSET (hd->fd, &rset))
 784         return IN_NET;
 785
 786 #ifdef _WIN32
 787       {
 788         int state;
 789         state = WaitForSingleObject(GetStdHandle(STD_INPUT_HANDLE), 200);
 790
 791         if (state == WAIT_OBJECT_0)
 792           return IN_KEYBOARD;
 793       }
 794 #else
 795       if (FD_ISSET (fileno (stdin), &rset))
 796         return IN_KEYBOARD;
 797 #endif
 798     }
 799   while(err == 0);
 800
 801   return IN_NONE;
 802 }
 803
 804 int
 805 main (int argc, char **argv)
 806 {
 807   int ret;
 808   int ii, i, inp;
 809   char buffer[MAX_BUF + 1];
 810   char *session_data = NULL;
 811   char *session_id = NULL;
 812   size_t session_data_size;
 813   size_t session_id_size = 0;
 814   int user_term = 0, retval = 0;
 815   socket_st hd;
 816   ssize_t bytes;
 817
 818   set_program_name (argv[0]);
 819   cmd_parser (argc, argv);
 820
 821   gnutls_global_set_log_function (tls_log_func);
 822   gnutls_global_set_log_level (OPT_VALUE_DEBUG);
 823
 824   if ((ret = gnutls_global_init ()) < 0)
 825     {
 826       fprintf (stderr, "global_init: %s\n", gnutls_strerror (ret));
 827       exit (1);
 828     }
 829
 830 #ifdef ENABLE_PKCS11
 831 //  pkcs11_common ();
 832 #endif
 833
 834   if (hostname == NULL)
 835     {
 836       fprintf (stderr, "No hostname given\n");
 837       exit (1);
 838     }
 839
 840   sockets_init ();
 841
 842   init_global_tls_stuff ();
 843
 844   socket_open (&hd, hostname, service, udp);
 845   socket_connect (&hd);
 846
 847   hd.session = init_tls_session (hostname);
 848   if (starttls)
 849     goto after_handshake;
 850
 851   for (i = 0; i < 2; i++)
 852     {
 853
 854
 855       if (i == 1)
 856         {
 857           hd.session = init_tls_session (hostname);
 858           gnutls_session_set_data (hd.session, session_data,
 859                                    session_data_size);
 860           free (session_data);
 861         }
 862
 863       ret = do_handshake (&hd);
 864
 865       if (ret < 0)
 866         {
 867           fprintf (stderr, "*** Handshake has failed\n");
 868           gnutls_perror (ret);
 869           gnutls_deinit (hd.session);
 870           return 1;
 871         }
 872       else
 873         {
 874           printf ("- Handshake was completed\n");
 875           if (gnutls_session_is_resumed (hd.session) != 0)
 876             printf ("*** This is a resumed session\n");
 877         }
 878
 879       if (resume != 0 && i == 0)
 880         {
 881
 882           gnutls_session_get_data (hd.session, NULL, &session_data_size);
 883           session_data = malloc (session_data_size);
 884
 885           gnutls_session_get_data (hd.session, session_data,
 886                                    &session_data_size);
 887
 888           gnutls_session_get_id (hd.session, NULL, &session_id_size);
 889
 890           session_id = malloc (session_id_size);
 891           gnutls_session_get_id (hd.session, session_id, &session_id_size);
 892
 893           printf ("- Disconnecting\n");
 894           socket_bye (&hd);
 895
 896           printf
 897             ("\n\n- Connecting again- trying to resume previous session\n");
 898           socket_open (&hd, hostname, service, udp);
 899           socket_connect (&hd);
 900         }
 901       else
 902         {
 903           break;
 904         }
 905     }
 906
 907 after_handshake:
 908
 909   /* Warning!  Do not touch this text string, it is used by external
 910      programs to search for when gnutls-cli has reached this point. */
 911   printf ("\n- Simple Client Mode:\n\n");
 912
 913   if (rehandshake)
 914     {
 915       ret = do_handshake (&hd);
 916
 917       if (ret < 0)
 918         {
 919           fprintf (stderr, "*** ReHandshake has failed\n");
 920           gnutls_perror (ret);
 921           gnutls_deinit (hd.session);
 922           return 1;
 923         }
 924       else
 925         {
 926           printf ("- ReHandshake was completed\n");
 927         }
 928     }
 929
 930 #ifndef _WIN32
 931   signal (SIGALRM, &starttls_alarm);
 932 #endif
 933
 934   fflush (stdout);
 935   fflush (stderr);
 936
 937   /* do not buffer */
 938 #ifndef _WIN32
 939   setbuf (stdin, NULL);
 940 #endif
 941   setbuf (stdout, NULL);
 942   setbuf (stderr, NULL);
 943
 944   for (;;)
 945     {
 946       if (starttls_alarmed && !hd.secure)
 947         {
 948           /* Warning!  Do not touch this text string, it is used by
 949              external programs to search for when gnutls-cli has
 950              reached this point. */
 951           fprintf (stderr, "*** Starting TLS handshake\n");
 952           ret = do_handshake (&hd);
 953           if (ret < 0)
 954             {
 955               fprintf (stderr, "*** Handshake has failed\n");
 956               user_term = 1;
 957               retval = 1;
 958               break;
 959             }
 960         }
 961
 962       inp = check_net_or_keyboard_input(&hd);
 963
 964       if (inp == IN_NET)
 965         {
 966           memset (buffer, 0, MAX_BUF + 1);
 967           ret = socket_recv (&hd, buffer, MAX_BUF);
 968
 969           if (ret == 0)
 970             {
 971               printf ("- Peer has closed the GnuTLS connection\n");
 972               break;
 973             }
 974           else if (handle_error (&hd, ret) < 0 && user_term == 0)
 975             {
 976               fprintf (stderr,
 977                        "*** Server has terminated the connection abnormally.\n");
 978               retval = 1;
 979               break;
 980             }
 981           else if (ret > 0)
 982             {
 983               if (verbose != 0)
 984                 printf ("- Received[%d]: ", ret);
 985               for (ii = 0; ii < ret; ii++)
 986                 {
 987                   fputc (buffer[ii], stdout);
 988                 }
 989               fflush (stdout);
 990             }
 991
 992           if (user_term != 0)
 993             break;
 994         }
 995
 996       if (inp == IN_KEYBOARD)
 997       {
 998           if ((bytes = read (fileno (stdin), buffer, MAX_BUF - 1)) <= 0)
 999             {
1000               if (hd.secure == 0)
1001                 {
1002                   /* Warning!  Do not touch this text string, it is
1003                      used by external programs to search for when
1004                      gnutls-cli has reached this point. */
1005                   fprintf (stderr, "*** Starting TLS handshake\n");
1006                   ret = do_handshake (&hd);
1007                   clearerr (stdin);
1008                   if (ret < 0)
1009                     {
1010                       fprintf (stderr, "*** Handshake has failed\n");
1011                       user_term = 1;
1012                       retval = 1;
1013                       break;
1014                     }
1015                 }
1016               else
1017                 {
1018                   user_term = 1;
1019                   break;
1020                 }
1021               continue;
1022             }
1023
1024           buffer[bytes] = 0;
1025           if (crlf != 0)
1026             {
1027               char *b = strchr (buffer, '\n');
1028               if (b != NULL)
1029                 {
1030                   strcpy (b, "\r\n");
1031                   bytes++;
1032                 }
1033             }
1034
1035           ret = socket_send (&hd, buffer, bytes);
1036
1037           if (ret > 0)
1038             {
1039               if (verbose != 0)
1040                 printf ("- Sent: %d bytes\n", ret);
1041             }
1042           else
1043             handle_error (&hd, ret);
1044
1045         }
1046     }
1047
1048   if (user_term != 0)
1049     socket_bye (&hd);
1050   else
1051     gnutls_deinit (hd.session);
1052
1053 #ifdef ENABLE_SRP
1054   if (srp_cred)
1055     gnutls_srp_free_client_credentials (srp_cred);
1056 #endif
1057 #ifdef ENABLE_PSK
1058   if (psk_cred)
1059     gnutls_psk_free_client_credentials (psk_cred);
1060 #endif
1061
1062   gnutls_certificate_free_credentials (xcred);
1063
1064 #ifdef ENABLE_ANON
1065   gnutls_anon_free_client_credentials (anon_cred);
1066 #endif
1067
1068   gnutls_global_deinit ();
1069
1070   return retval;
1071 }
1072
1073 static void
1074 cmd_parser (int argc, char **argv)
1075 {
1076 const char* rest = NULL;
1077
1078   int optct = optionProcess( &gnutls_cliOptions, argc, argv);
1079   argc -= optct;
1080   argv += optct;
1081
1082   if (rest == NULL && argc > 0)
1083     rest = argv[0];
1084
1085   if (HAVE_OPT(BENCHMARK_CIPHERS))
1086     {
1087       benchmark_cipher(1, OPT_VALUE_DEBUG);
1088       exit(0);
1089     }
1090
1091   if (HAVE_OPT(BENCHMARK_SOFT_CIPHERS))
1092     {
1093       benchmark_cipher(0, OPT_VALUE_DEBUG);
1094       exit(0);
1095     }
1096
1097   if (HAVE_OPT(BENCHMARK_TLS_CIPHERS))
1098     {
1099       benchmark_tls(OPT_VALUE_DEBUG, 1);
1100       exit(0);
1101     }
1102
1103   if (HAVE_OPT(BENCHMARK_TLS_KX))
1104     {
1105       benchmark_tls(OPT_VALUE_DEBUG, 0);
1106       exit(0);
1107     }
1108
1109   if (HAVE_OPT(PRIORITY))
1110     {
1111       priorities = OPT_ARG(PRIORITY);
1112     }
1113   verbose = HAVE_OPT( VERBOSE);
1114   if (verbose)
1115     print_cert = 1;
1116   else
1117     print_cert = HAVE_OPT( PRINT_CERT);
1118
1119   if (HAVE_OPT(LIST))
1120     {
1121       print_list(priorities, verbose);
1122       exit(0);
1123     }
1124
1125   disable_extensions = HAVE_OPT( DISABLE_EXTENSIONS);
1126   if (disable_extensions)
1127     init_flags |= GNUTLS_NO_EXTENSIONS;
1128
1129   starttls = HAVE_OPT(STARTTLS);
1130   resume = HAVE_OPT(RESUME);
1131   rehandshake = HAVE_OPT(REHANDSHAKE);
1132   insecure = HAVE_OPT(INSECURE);
1133
1134   udp = HAVE_OPT(UDP);
1135   mtu = OPT_VALUE_MTU;
1136
1137   if (HAVE_OPT(PORT))
1138     {
1139       service = OPT_ARG(PORT);
1140     }
1141   else
1142     {
1143       service = "443";
1144     }
1145
1146   record_max_size = OPT_VALUE_RECORDSIZE;
1147   status_request_ocsp = ENABLED_OPT(OCSP_STATUS_REQUEST);
1148   if (ENABLED_OPT(OCSP))
1149     status_request_ocsp = 1;
1150
1151   fingerprint = HAVE_OPT(FINGERPRINT);
1152
1153   if (HAVE_OPT(X509FMTDER))
1154     x509ctype = GNUTLS_X509_FMT_DER;
1155   else
1156     x509ctype = GNUTLS_X509_FMT_PEM;
1157
1158   if (HAVE_OPT(SRPUSERNAME))
1159     srp_username = OPT_ARG(SRPUSERNAME);
1160
1161   if (HAVE_OPT(SRPPASSWD))
1162     srp_passwd = OPT_ARG(SRPPASSWD);
1163
1164   if (HAVE_OPT(X509CAFILE))
1165     x509_cafile = OPT_ARG(X509CAFILE);
1166
1167   if (HAVE_OPT(X509CRLFILE))
1168     x509_crlfile = OPT_ARG(X509CRLFILE);
1169
1170   if (HAVE_OPT(X509KEYFILE))
1171     x509_keyfile = OPT_ARG(X509KEYFILE);
1172
1173   if (HAVE_OPT(X509CERTFILE))
1174     x509_certfile = OPT_ARG(X509CERTFILE);
1175
1176   if (HAVE_OPT(PGPKEYFILE))
1177     pgp_keyfile = OPT_ARG(PGPKEYFILE);
1178
1179   if (HAVE_OPT(PGPCERTFILE))
1180     pgp_certfile = OPT_ARG(PGPCERTFILE);
1181
1182   if (HAVE_OPT(PSKUSERNAME))
1183     psk_username = OPT_ARG(PSKUSERNAME);
1184
1185   if (HAVE_OPT(PSKKEY))
1186     {
1187       psk_key.data = (unsigned char *) OPT_ARG(PSKKEY);
1188       psk_key.size = strlen (OPT_ARG(PSKKEY));
1189     }
1190   else
1191     psk_key.size = 0;
1192
1193   if (HAVE_OPT(PGPKEYRING))
1194     pgp_keyring = OPT_ARG(PGPKEYRING);
1195
1196   crlf = HAVE_OPT(CRLF);
1197
1198   if (rest != NULL)
1199     hostname = rest;
1200
1201   if (hostname == NULL)
1202     {
1203       fprintf(stderr, "No hostname specified\n");
1204       exit(1);
1205     }
1206 }
1207
1208 static void
1209 check_rehandshake (socket_st * socket, int ret)
1210 {
1211   if (socket->secure && ret == GNUTLS_E_REHANDSHAKE)
1212     {
1213       /* There is a race condition here. If application
1214        * data is sent after the rehandshake request,
1215        * the server thinks we ignored his request.
1216        * This is a bad design of this client.
1217        */
1218       printf ("*** Received rehandshake request\n");
1219       /* gnutls_alert_send( session, GNUTLS_AL_WARNING, GNUTLS_A_NO_RENEGOTIATION); */
1220
1221       ret = do_handshake (socket);
1222
1223       if (ret == 0)
1224         {
1225           printf ("*** Rehandshake was performed.\n");
1226         }
1227       else
1228         {
1229           printf ("*** Rehandshake Failed.\n");
1230         }
1231     }
1232 }
1233
1234
1235 static int
1236 do_handshake (socket_st * socket)
1237 {
1238   int ret;
1239
1240   gnutls_transport_set_ptr (socket->session,
1241                             (gnutls_transport_ptr_t)
1242                             gl_fd_to_handle (socket->fd));
1243   do
1244     {
1245       gnutls_handshake_set_timeout( socket->session, GNUTLS_DEFAULT_HANDSHAKE_TIMEOUT);
1246       ret = gnutls_handshake (socket->session);
1247
1248       if (ret < 0)
1249         {
1250           handle_error (socket, ret);
1251         }
1252     }
1253   while (ret < 0 && gnutls_error_is_fatal (ret) == 0);
1254
1255   if (ret == 0)
1256     {
1257       /* print some information */
1258       print_info (socket->session, verbose, 0);
1259       socket->secure = 1;
1260     }
1261   else
1262     {
1263       gnutls_alert_send_appropriate (socket->session, ret);
1264       shutdown (socket->fd, SHUT_RDWR);
1265     }
1266   return ret;
1267 }
1268
1269 static int
1270 srp_username_callback (gnutls_session_t session,
1271                        char **username, char **password)
1272 {
1273   if (srp_username == NULL || srp_passwd == NULL)
1274     {
1275       return -1;
1276     }
1277
1278   *username = gnutls_strdup (srp_username);
1279   *password = gnutls_strdup (srp_passwd);
1280
1281   return 0;
1282 }
1283
1284 static int
1285 psk_callback (gnutls_session_t session, char **username, gnutls_datum_t * key)
1286 {
1287   const char *hint = gnutls_psk_client_get_hint (session);
1288   char *rawkey;
1289   char *passwd;
1290   int ret;
1291   size_t res_size;
1292   gnutls_datum_t tmp;
1293
1294   printf ("- PSK client callback. ");
1295   if (hint)
1296     printf ("PSK hint '%s'\n", hint);
1297   else
1298     printf ("No PSK hint\n");
1299
1300   if (HAVE_OPT(PSKUSERNAME))
1301     *username = gnutls_strdup (OPT_ARG(PSKUSERNAME));
1302   else
1303     {
1304       char *tmp = NULL;
1305       size_t n;
1306
1307       printf ("Enter PSK identity: ");
1308       fflush (stdout);
1309       getline (&tmp, &n, stdin);
1310
1311       if (tmp == NULL)
1312         {
1313           fprintf (stderr, "No username given, aborting...\n");
1314           return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
1315         }
1316
1317       if (tmp[strlen (tmp) - 1] == '\n')
1318         tmp[strlen (tmp) - 1] = '\0';
1319       if (tmp[strlen (tmp) - 1] == '\r')
1320         tmp[strlen (tmp) - 1] = '\0';
1321
1322       *username = gnutls_strdup (tmp);
1323       free (tmp);
1324     }
1325   if (!*username)
1326     return GNUTLS_E_MEMORY_ERROR;
1327
1328   passwd = getpass ("Enter key: ");
1329   if (passwd == NULL)
1330     {
1331       fprintf (stderr, "No key given, aborting...\n");
1332       return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
1333     }
1334
1335   tmp.data = (void*)passwd;
1336   tmp.size = strlen (passwd);
1337
1338   res_size = tmp.size / 2 + 1;
1339   rawkey = gnutls_malloc (res_size);
1340   if (rawkey == NULL)
1341     return GNUTLS_E_MEMORY_ERROR;
1342
1343   ret = gnutls_hex_decode (&tmp, rawkey, &res_size);
1344   if (ret < 0)
1345     {
1346       fprintf (stderr, "Error deriving password: %s\n",
1347                gnutls_strerror (ret));
1348       gnutls_free (*username);
1349       return ret;
1350     }
1351
1352   key->data = (void*)rawkey;
1353   key->size = res_size;
1354
1355   if (HAVE_OPT(DEBUG))
1356     {
1357       char hexkey[41];
1358       res_size = sizeof (hexkey);
1359       gnutls_hex_encode (key, hexkey, &res_size);
1360       fprintf (stderr, "PSK username: %s\n", *username);
1361       fprintf (stderr, "PSK hint: %s\n", hint);
1362       fprintf (stderr, "PSK key: %s\n", hexkey);
1363     }
1364
1365   return 0;
1366 }
1367
1368 static void
1369 init_global_tls_stuff (void)
1370 {
1371   int ret;
1372
1373   /* X509 stuff */
1374   if (gnutls_certificate_allocate_credentials (&xcred) < 0)
1375     {
1376       fprintf (stderr, "Certificate allocation memory error\n");
1377       exit (1);
1378     }
1379   gnutls_certificate_set_pin_function(xcred, pin_callback, NULL);
1380
1381   if (x509_cafile != NULL)
1382     {
1383       ret = gnutls_certificate_set_x509_trust_file (xcred,
1384                                                     x509_cafile, x509ctype);
1385     }
1386   else
1387     {
1388       ret = gnutls_certificate_set_x509_system_trust (xcred);
1389     }
1390   if (ret < 0)
1391     {
1392       fprintf (stderr, "Error setting the x509 trust file\n");
1393     }
1394   else
1395     {
1396       printf ("Processed %d CA certificate(s).\n", ret);
1397     }
1398
1399   if (x509_crlfile != NULL)
1400     {
1401       ret = gnutls_certificate_set_x509_crl_file (xcred, x509_crlfile,
1402                                                   x509ctype);
1403       if (ret < 0)
1404         {
1405           fprintf (stderr, "Error setting the x509 CRL file\n");
1406         }
1407       else
1408         {
1409           printf ("Processed %d CRL(s).\n", ret);
1410         }
1411     }
1412
1413   load_keys ();
1414
1415 #ifdef ENABLE_OPENPGP
1416   if (pgp_keyring != NULL)
1417     {
1418       ret =
1419         gnutls_certificate_set_openpgp_keyring_file (xcred, pgp_keyring,
1420                                                      GNUTLS_OPENPGP_FMT_BASE64);
1421       if (ret < 0)
1422         {
1423           fprintf (stderr, "Error setting the OpenPGP keyring file\n");
1424         }
1425     }
1426 #endif
1427
1428 #ifdef ENABLE_SRP
1429   if (srp_username && srp_passwd)
1430     {
1431       /* SRP stuff */
1432       if (gnutls_srp_allocate_client_credentials (&srp_cred) < 0)
1433         {
1434           fprintf (stderr, "SRP authentication error\n");
1435         }
1436
1437       gnutls_srp_set_client_credentials_function (srp_cred,
1438                                                   srp_username_callback);
1439     }
1440 #endif
1441
1442 #ifdef ENABLE_PSK
1443   /* PSK stuff */
1444   if (gnutls_psk_allocate_client_credentials (&psk_cred) < 0)
1445     {
1446       fprintf (stderr, "PSK authentication error\n");
1447     }
1448
1449   if (psk_username && psk_key.data)
1450     {
1451       ret = gnutls_psk_set_client_credentials (psk_cred,
1452                                                psk_username, &psk_key,
1453                                                GNUTLS_PSK_KEY_HEX);
1454       if (ret < 0)
1455         {
1456           fprintf (stderr, "Error setting the PSK credentials: %s\n",
1457                    gnutls_strerror (ret));
1458         }
1459     }
1460   else
1461     gnutls_psk_set_client_credentials_function (psk_cred, psk_callback);
1462 #endif
1463
1464 #ifdef ENABLE_ANON
1465   /* ANON stuff */
1466   if (gnutls_anon_allocate_client_credentials (&anon_cred) < 0)
1467     {
1468       fprintf (stderr, "Anonymous authentication error\n");
1469     }
1470 #endif
1471
1472 }
1473
1474 /* OCSP check for the peer's certificate. Should be called
1475  * only after the certificate list verication is complete.
1476  * Returns:
1477  * 0: certificate is revoked
1478  * 1: certificate is ok
1479  * -1: dunno
1480  */
1481 static int
1482 cert_verify_ocsp (gnutls_session_t session)
1483 {
1484   gnutls_x509_crt_t crt, issuer;
1485   const gnutls_datum_t *cert_list;
1486   unsigned int cert_list_size = 0;
1487   int deinit_issuer = 0;
1488   gnutls_datum_t resp;
1489   int ret;
1490
1491   cert_list = gnutls_certificate_get_peers (session, &cert_list_size);
1492   if (cert_list_size == 0)
1493     {
1494       fprintf (stderr, "No certificates found!\n");
1495       return -1;
1496     }
1497
1498   gnutls_x509_crt_init (&crt);
1499   ret =
1500       gnutls_x509_crt_import (crt, &cert_list[0],
1501                               GNUTLS_X509_FMT_DER);
1502   if (ret < 0)
1503     {
1504       fprintf (stderr, "Decoding error: %s\n",
1505                gnutls_strerror (ret));
1506       return -1;
1507     }
1508
1509   ret = gnutls_certificate_get_issuer(xcred, crt, &issuer, 0);
1510   if (ret < 0 && cert_list_size > 1)
1511     {
1512       gnutls_x509_crt_init(&issuer);
1513       ret = gnutls_x509_crt_import(issuer, &cert_list[1], GNUTLS_X509_FMT_DER);
1514       if (ret < 0)
1515         {
1516           fprintf (stderr, "Decoding error: %s\n",
1517                    gnutls_strerror (ret));
1518            return -1;
1519         }
1520       deinit_issuer = 1;
1521     }
1522   else if (ret < 0)
1523     {
1524       fprintf(stderr, "Cannot find issuer\n");
1525       ret = -1;
1526       goto cleanup;
1527     }
1528
1529   ret = send_ocsp_request(NULL, crt, issuer, &resp, 1);
1530   if (ret < 0)
1531     {
1532       fprintf(stderr, "Cannot contact OCSP server\n");
1533       ret = -1;
1534       goto cleanup;
1535     }
1536
1537   /* verify and check the response for revoked cert */
1538   ret = check_ocsp_response(crt, issuer, &resp);
1539
1540 cleanup:
1541   if (deinit_issuer)
1542     gnutls_x509_crt_deinit (issuer);
1543   gnutls_x509_crt_deinit (crt);
1544
1545   return ret;
1546 }