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