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check_ldap.c

/*****************************************************************************
* 
* Nagios check_ldap plugin
* 
* License: GPL
* Copyright (c) 2000-2008 Nagios Plugins Development Team
* 
* Last Modified: $Date: 2008-05-07 11:02:42 +0100 (Wed, 07 May 2008) $
* 
* Description:
* 
* This file contains the check_ldap plugin
* 
* 
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* 
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
* 
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.
* 
* $Id: check_ldap.c 1991 2008-05-07 10:02:42Z dermoth $
* 
*****************************************************************************/

/* progname may be check_ldaps */
char *progname = "check_ldap";
const char *revision = "$Revision: 1991 $";
const char *copyright = "2000-2008";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

#include "common.h"
#include "netutils.h"
#include "utils.h"

#include <lber.h>
#include <ldap.h>

enum {
      UNDEFINED = 0,
#ifdef HAVE_LDAP_SET_OPTION
      DEFAULT_PROTOCOL = 2,
#endif
      DEFAULT_PORT = 389
};

int process_arguments (int, char **);
int validate_arguments (void);
void print_help (void);
void print_usage (void);

char ld_defattr[] = "(objectclass=*)";
char *ld_attr = ld_defattr;
char *ld_host = NULL;
char *ld_base = NULL;
char *ld_passwd = NULL;
char *ld_binddn = NULL;
int ld_port = DEFAULT_PORT;
#ifdef HAVE_LDAP_SET_OPTION
int ld_protocol = DEFAULT_PROTOCOL;
#endif
#ifndef LDAP_OPT_SUCCESS
# define LDAP_OPT_SUCCESS LDAP_SUCCESS
#endif
double warn_time = UNDEFINED;
double crit_time = UNDEFINED;
struct timeval tv;
int starttls = FALSE;
int ssl_on_connect = FALSE;
int verbose = 0;

/* for ldap tls */

char *SERVICE = "LDAP";

int
main (int argc, char *argv[])
{

      LDAP *ld;
      LDAPMessage *result;

      /* should be      int result = STATE_UNKNOWN; */
      
      int status = STATE_UNKNOWN;
      long microsec;
      double elapsed_time;
      
      /* for ldap tls */
      
      int tls; 
      int version=3;

      setlocale (LC_ALL, "");
      bindtextdomain (PACKAGE, LOCALEDIR);
      textdomain (PACKAGE);

      if (strstr(argv[0],"check_ldaps")) {
            asprintf (&progname, "check_ldaps");
      }

      /* Parse extra opts if any */
      argv=np_extra_opts (&argc, argv, progname);

      if (process_arguments (argc, argv) == ERROR)
            usage4 (_("Could not parse arguments"));

      if (strstr(argv[0],"check_ldaps") && ! starttls && ! ssl_on_connect)
            starttls = TRUE;

      /* initialize alarm signal handling */
      signal (SIGALRM, socket_timeout_alarm_handler);

      /* set socket timeout */
      alarm (socket_timeout);

      /* get the start time */
      gettimeofday (&tv, NULL);

      /* initialize ldap */
#ifdef HAVE_LDAP_INIT
      if (!(ld = ldap_init (ld_host, ld_port))) {
            printf ("Could not connect to the server at port %i\n", ld_port);
            return STATE_CRITICAL;
      }
#else 
      if (!(ld = ldap_open (ld_host, ld_port))) {
            if (verbose)
                  ldap_perror(ld, "ldap_open");
            printf (_("Could not connect to the server at port %i\n"), ld_port);
            return STATE_CRITICAL;
      }
#endif /* HAVE_LDAP_INIT */
      
#ifdef HAVE_LDAP_SET_OPTION
      /* set ldap options */
      if (ldap_set_option (ld, LDAP_OPT_PROTOCOL_VERSION, &ld_protocol) !=
                  LDAP_OPT_SUCCESS ) {
            printf(_("Could not set protocol version %d\n"), ld_protocol);
            return STATE_CRITICAL;
      }
#endif

      if (ld_port == LDAPS_PORT || ssl_on_connect) {
            asprintf (&SERVICE, "LDAPS");
#if defined(HAVE_LDAP_SET_OPTION) && defined(LDAP_OPT_X_TLS)
            /* ldaps: set option tls */
            tls = LDAP_OPT_X_TLS_HARD;
            
            if (ldap_set_option (ld, LDAP_OPT_X_TLS, &tls) != LDAP_SUCCESS)
            {
                  if (verbose)
                        ldap_perror(ld, "ldaps_option");
                  printf (_("Could not init TLS at port %i!\n"), ld_port);
                  return STATE_CRITICAL;
            }
#else
            printf (_("TLS not supported by the libraries!\n"));
            return STATE_CRITICAL;
#endif /* LDAP_OPT_X_TLS */
      } else if (starttls) {
            asprintf (&SERVICE, "LDAP-TLS");
#if defined(HAVE_LDAP_SET_OPTION) && defined(HAVE_LDAP_START_TLS_S)
            /* ldap with startTLS: set option version */
            if (ldap_get_option(ld,LDAP_OPT_PROTOCOL_VERSION, &version) == LDAP_OPT_SUCCESS )
            {
                  if (version < LDAP_VERSION3)
                  {
                        version = LDAP_VERSION3;
                        ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, &version);
                  }
            }
            /* call start_tls */
            if (ldap_start_tls_s(ld, NULL, NULL) != LDAP_SUCCESS)
            {
                  if (verbose) 
                        ldap_perror(ld, "ldap_start_tls");
                  printf (_("Could not init startTLS at port %i!\n"), ld_port);
                  return STATE_CRITICAL;
            }
#else
            printf (_("startTLS not supported by the library, needs LDAPv3!\n"));
            return STATE_CRITICAL;
#endif /* HAVE_LDAP_START_TLS_S */
      }
      
      /* bind to the ldap server */
      if (ldap_bind_s (ld, ld_binddn, ld_passwd, LDAP_AUTH_SIMPLE) !=
                  LDAP_SUCCESS) {
            if (verbose)
                  ldap_perror(ld, "ldap_bind");
            printf (_("Could not bind to the ldap-server\n"));
            return STATE_CRITICAL;
      }

      /* do a search of all objectclasses in the base dn */
      if (ldap_search_s (ld, ld_base, LDAP_SCOPE_BASE, ld_attr, NULL, 0, &result)
                  != LDAP_SUCCESS) {
            if (verbose)
                  ldap_perror(ld, "ldap_search");
            printf (_("Could not search/find objectclasses in %s\n"), ld_base);
            return STATE_CRITICAL;
      }

      /* unbind from the ldap server */
      ldap_unbind (ld);

      /* reset the alarm handler */
      alarm (0);

      /* calcutate the elapsed time and compare to thresholds */

      microsec = deltime (tv);
      elapsed_time = (double)microsec / 1.0e6;

      if (crit_time!=UNDEFINED && elapsed_time>crit_time)
            status = STATE_CRITICAL;
      else if (warn_time!=UNDEFINED && elapsed_time>warn_time)
            status = STATE_WARNING;
      else
            status = STATE_OK;

      /* print out the result */
      printf (_("LDAP %s - %.3f seconds response time|%s\n"),
              state_text (status),
              elapsed_time,
              fperfdata ("time", elapsed_time, "s",
                        (int)warn_time, warn_time,
                        (int)crit_time, crit_time,
                        TRUE, 0, FALSE, 0));

      return status;
}

/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
      int c;

      int option = 0;
      /* initialize the long option struct */
      static struct option longopts[] = {
            {"help", no_argument, 0, 'h'},
            {"version", no_argument, 0, 'V'},
            {"timeout", required_argument, 0, 't'},
            {"host", required_argument, 0, 'H'},
            {"base", required_argument, 0, 'b'},
            {"attr", required_argument, 0, 'a'},
            {"bind", required_argument, 0, 'D'},
            {"pass", required_argument, 0, 'P'},
#ifdef HAVE_LDAP_SET_OPTION
            {"ver2", no_argument, 0, '2'},
            {"ver3", no_argument, 0, '3'},
#endif
            {"starttls", no_argument, 0, 'T'},
            {"ssl", no_argument, 0, 'S'},
            {"use-ipv4", no_argument, 0, '4'},
            {"use-ipv6", no_argument, 0, '6'},
            {"port", required_argument, 0, 'p'},
            {"warn", required_argument, 0, 'w'},
            {"crit", required_argument, 0, 'c'},
            {"verbose", no_argument, 0, 'v'},
            {0, 0, 0, 0}
      };

      if (argc < 2)
            return ERROR;

      for (c = 1; c < argc; c++) {
            if (strcmp ("-to", argv[c]) == 0)
                  strcpy (argv[c], "-t");
      }

      while (1) {
            c = getopt_long (argc, argv, "hvV234TS6t:c:w:H:b:p:a:D:P:", longopts, &option);

            if (c == -1 || c == EOF)
                  break;

            switch (c) {
            case 'h':                                                   /* help */
                  print_help ();
                  exit (STATE_OK);
            case 'V':                                                   /* version */
                  print_revision (progname, revision);
                  exit (STATE_OK);
            case 't':                                                   /* timeout period */
                  if (!is_intnonneg (optarg))
                        usage2 (_("Timeout interval must be a positive integer"), optarg);
                  else
                        socket_timeout = atoi (optarg);
                  break;
            case 'H':
                  ld_host = optarg;
                  break;
            case 'b':
                  ld_base = optarg;
                  break;
            case 'p':
                  ld_port = atoi (optarg);
                  break;
            case 'a':
                  ld_attr = optarg;
                  break;
            case 'D':
                  ld_binddn = optarg;
                  break;
            case 'P':
                  ld_passwd = optarg;
                  break;
            case 'w':
                  warn_time = strtod (optarg, NULL);
                  break;
            case 'c':
                  crit_time = strtod (optarg, NULL);
                  break;
#ifdef HAVE_LDAP_SET_OPTION
            case '2':
                  ld_protocol = 2;
                  break;
            case '3':
                  ld_protocol = 3;
                  break;
#endif
            case '4':
                  address_family = AF_INET;
                  break;
            case 'v':
                  verbose++;
                  break;
            case 'T':
                  if (! ssl_on_connect)
                        starttls = TRUE;
                  else
                        usage_va(_("%s cannot be combined with %s"), "-T/--starttls", "-S/--ssl");
                  break;
            case 'S':
                  if (! starttls) {
                        ssl_on_connect = TRUE;
                        ld_port = LDAPS_PORT;
                  } else
                        usage_va(_("%s cannot be combined with %s"), "-S/--ssl", "-T/--starttls");
                  break;
            case '6':
#ifdef USE_IPV6
                  address_family = AF_INET6;
#else
                  usage (_("IPv6 support not available\n"));
#endif
                  break;
            default:
                  usage5 ();
            }
      }

      c = optind;
      if (ld_host == NULL && is_host(argv[c]))
            ld_host = strdup (argv[c++]);

      if (ld_base == NULL && argv[c])
            ld_base = strdup (argv[c++]);

      return validate_arguments ();
}


int
validate_arguments ()
{
      if (ld_host==NULL || strlen(ld_host)==0)
            usage4 (_("Please specify the host name\n"));

      if (ld_base==NULL || strlen(ld_base)==0)
            usage4 (_("Please specify the LDAP base\n"));

      return OK;
}


void
print_help (void)
{
      char *myport;
      asprintf (&myport, "%d", DEFAULT_PORT);

      print_revision (progname, revision);

      printf ("Copyright (c) 1999 Didi Rieder (adrieder@sbox.tu-graz.ac.at)\n");
      printf (COPYRIGHT, copyright, email);

      printf ("\n\n");

      print_usage ();

      printf (_(UT_HELP_VRSN));
      printf (_(UT_EXTRA_OPTS));

      printf (_(UT_HOST_PORT), 'p', myport);

      printf (_(UT_IPv46));

      printf (" %s\n", "-a [--attr]");
  printf ("    %s\n", _("ldap attribute to search (default: \"(objectclass=*)\""));
  printf (" %s\n", "-b [--base]");
  printf ("    %s\n", _("ldap base (eg. ou=my unit, o=my org, c=at"));
  printf (" %s\n", "-D [--bind]");
  printf ("    %s\n", _("ldap bind DN (if required)"));
  printf (" %s\n", "-P [--pass]");
  printf ("    %s\n", _("ldap password (if required)"));
  printf (" %s\n", "-T [--starttls]");
  printf ("    %s\n", _("use starttls mechanism introduced in protocol version 3"));
  printf (" %s\n", "-S [--ssl]");
  printf ("    %s %i\n", _("use ldaps (ldap v2 ssl method). this also sets the default port to"), LDAPS_PORT);

#ifdef HAVE_LDAP_SET_OPTION
      printf (" %s\n", "-2 [--ver2]");
  printf ("    %s\n", _("use ldap protocol version 2"));
  printf (" %s\n", "-3 [--ver3]");
  printf ("    %s\n", _("use ldap protocol version 3"));
  printf ("    (%s %d)\n", _("default protocol version:"), DEFAULT_PROTOCOL);
#endif

      printf (_(UT_WARN_CRIT));

      printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);

      printf (_(UT_VERBOSE));

      printf ("\n");
      printf ("%s\n", _("Notes:"));
      printf (" %s\n", _("If this plugin is called via 'check_ldaps', method 'STARTTLS' will be"));
      printf (_(" implied (using default port %i) unless --port=636 is specified. In that case\n"), DEFAULT_PORT);
      printf (" %s\n", _("'SSL on connect' will be used no matter how the plugin was called."));
      printf (" %s\n", _("This detection is deprecated, please use 'check_ldap' with the '--starttls' or '--ssl' flags"));
      printf (" %s\n", _("to define the behaviour explicitly instead."));
#ifdef NP_EXTRA_OPTS
      printf ("\n");
      printf (_(UT_EXTRA_OPTS_NOTES));
#endif

      printf (_(UT_SUPPORT));
}

/* todo
* add option -4 and -6 to the long manual
*
*/

void
print_usage (void)
{
  printf (_("Usage:"));
      printf (" %s -H <host> -b <base_dn> [-p <port>] [-a <attr>] [-D <binddn>]",progname);
  printf ("\n       [-P <password>] [-w <warn_time>] [-c <crit_time>] [-t timeout]%s\n",
#ifdef HAVE_LDAP_SET_OPTION
                  "\n       [-2|-3] [-4|-6]"
#else
                  ""
#endif
                  );
}

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