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check_radius.c

/*****************************************************************************
* 
* Nagios check_radius plugin
* 
* License: GPL
* Copyright (c) 1999-2008 Nagios Plugins Development Team
* 
* Description:
* 
* This file contains the check_radius plugin
* 
* Tests to see if a radius server is accepting connections.
* 
* 
* 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/>.
* 
* 
*****************************************************************************/

const char *progname = "check_radius";
const char *copyright = "2000-2008";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

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

#ifdef HAVE_LIBRADIUSCLIENT_NG
#include <radiusclient-ng.h>
rc_handle *rch = NULL;
#else
#include <radiusclient.h>
#endif

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

/* libradiusclient(-ng) wrapper functions */
#ifdef HAVE_LIBRADIUSCLIENT_NG
#define my_rc_conf_str(a) rc_conf_str(rch,a)
#define my_rc_send_server(a,b) rc_send_server(rch,a,b)
#define my_rc_buildreq(a,b,c,d,e,f) rc_buildreq(rch,a,b,c,d,e,f)
#define my_rc_own_ipaddress() rc_own_ipaddress(rch)
#define my_rc_avpair_add(a,b,c,d) rc_avpair_add(rch,a,b,c,-1,d)
#define my_rc_read_dictionary(a) rc_read_dictionary(rch, a)
#else
#define my_rc_conf_str(a) rc_conf_str(a)
#define my_rc_send_server(a,b) rc_send_server(a, b)
#define my_rc_buildreq(a,b,c,d,e,f) rc_buildreq(a,b,c,d,e,f)
#define my_rc_own_ipaddress() rc_own_ipaddress()
#define my_rc_avpair_add(a,b,c,d) rc_avpair_add(a, b, c, d)
#define my_rc_read_dictionary(a) rc_read_dictionary(a)
#endif
int my_rc_read_config(char *);

char *server = NULL;
char *username = NULL;
char *password = NULL;
char *nasid = NULL;
char *expect = NULL;
char *config_file = NULL;
unsigned short port = PW_AUTH_UDP_PORT;
int retries = 1;
int verbose = FALSE;
ENV *env = NULL;

/******************************************************************************

The (psuedo?)literate programming XML is contained within \@\@\- <XML> \-\@\@
tags in the comments. With in the tags, the XML is assembled sequentially.
You can define entities in tags. You also have all the #defines available as
entities.

Please note that all tags must be lowercase to use the DocBook XML DTD.

@@-<article>

<sect1>
<title>Quick Reference</title>
<!-- The refentry forms a manpage -->
<refentry>
<refmeta>
<manvolnum>5<manvolnum>
</refmeta>
<refnamdiv>
<refname>&progname;</refname>
<refpurpose>&SUMMARY;</refpurpose>
</refnamdiv>
</refentry>
</sect1>

<sect1>
<title>FAQ</title>
</sect1>

<sect1>
<title>Theory, Installation, and Operation</title>

<sect2>
<title>General Description</title>
<para>
&DESCRIPTION;
</para>
</sect2>

<sect2>
<title>Future Enhancements</title>
<para>Todo List</para>
<itemizedlist>
<listitem>Add option to get password from a secured file rather than the command line</listitem>
</itemizedlist>
</sect2>


<sect2>
<title>Functions</title>
-@@
******************************************************************************/



int
main (int argc, char **argv)
{
      UINT4 service;
      char msg[BUFFER_LEN];
      SEND_DATA data;
      int result = STATE_UNKNOWN;
      UINT4 client_id;
      char *str;

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

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

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

      str = strdup ("dictionary");
      if ((config_file && my_rc_read_config (config_file)) ||
                  my_rc_read_dictionary (my_rc_conf_str (str)))
            die (STATE_UNKNOWN, _("Config file error"));

      service = PW_AUTHENTICATE_ONLY;

      memset (&data, 0, sizeof(data));
      if (!(my_rc_avpair_add (&data.send_pairs, PW_SERVICE_TYPE, &service, 0) &&
                        my_rc_avpair_add (&data.send_pairs, PW_USER_NAME, username, 0) &&
                        my_rc_avpair_add (&data.send_pairs, PW_USER_PASSWORD, password, 0) &&
                        (nasid==NULL || my_rc_avpair_add (&data.send_pairs, PW_NAS_IDENTIFIER, nasid, 0))))
            die (STATE_UNKNOWN, _("Out of Memory?"));

      /*
       * Fill in NAS-IP-Address
       */

      if ((client_id = my_rc_own_ipaddress ()) == 0)
            return (ERROR_RC);

      if (my_rc_avpair_add (&(data.send_pairs), PW_NAS_IP_ADDRESS, &client_id, 0) ==
                  NULL) return (ERROR_RC);

      my_rc_buildreq (&data, PW_ACCESS_REQUEST, server, port, (int)timeout_interval,
                   retries);

      result = my_rc_send_server (&data, msg);
      rc_avpair_free (data.send_pairs);
      if (data.receive_pairs)
            rc_avpair_free (data.receive_pairs);

      if (result == TIMEOUT_RC)
            die (STATE_CRITICAL, _("Timeout"));
      if (result == ERROR_RC)
            die (STATE_CRITICAL, _("Auth Error"));
      if (result == BADRESP_RC)
            die (STATE_WARNING, _("Auth Failed"));
      if (expect && !strstr (msg, expect))
            die (STATE_WARNING, "%s", msg);
      if (result == OK_RC)
            die (STATE_OK, _("Auth OK"));
      return (0);
}



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

      int option = 0;
      static struct option longopts[] = {
            {"hostname", required_argument, 0, 'H'},
            {"port", required_argument, 0, 'P'},
            {"username", required_argument, 0, 'u'},
            {"password", required_argument, 0, 'p'},
            {"nas-id", required_argument, 0, 'n'},
            {"filename", required_argument, 0, 'F'},
            {"expect", required_argument, 0, 'e'},
            {"retries", required_argument, 0, 'r'},
            {"timeout", required_argument, 0, 't'},
            {"verbose", no_argument, 0, 'v'},
            {"version", no_argument, 0, 'V'},
            {"help", no_argument, 0, 'h'},
            {0, 0, 0, 0}
      };

      while (1) {
            c = getopt_long (argc, argv, "+hVvH:P:F:u:p:n:t:r:e:", longopts,
                                                       &option);

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

            switch (c) {
            case '?':                                                   /* print short usage statement if args not parsable */
                  usage5 ();
            case 'h':                                                   /* help */
                  print_help ();
                  exit (OK);
            case 'V':                                                   /* version */
                  print_revision (progname, NP_VERSION);
                  exit (OK);
            case 'v':                                                   /* verbose mode */
                  verbose = TRUE;
                  break;
            case 'H':                                                   /* hostname */
                  if (is_host (optarg) == FALSE) {
                        usage2 (_("Invalid hostname/address"), optarg);
                  }
                  server = optarg;
                  break;
            case 'P':                                                   /* port */
                  if (is_intnonneg (optarg))
                        port = atoi (optarg);
                  else
                        usage4 (_("Port must be a positive integer"));
                  break;
            case 'u':                                                   /* username */
                  username = optarg;
                  break;
            case 'p':                                                   /* password */
                  password = strdup(optarg);

                  /* Delete the password from process list */
                  while (*optarg != '\0') {
                        *optarg = 'X';
                        optarg++;
                  }
                  break;
            case 'n':                                                   /* nas id */
                  nasid = optarg;
                  break;
            case 'F':                                                   /* configuration file */
                  config_file = optarg;
                  break;
            case 'e':                                                   /* expect */
                  expect = optarg;
                  break;
            case 'r':                                                   /* retries */
                  if (is_intpos (optarg))
                        retries = atoi (optarg);
                  else
                        usage4 (_("Number of retries must be a positive integer"));
                  break;
            case 't':                                                   /* timeout */
                  if (is_intpos (optarg))
                        timeout_interval = atoi (optarg);
                  else
                        usage2 (_("Timeout interval must be a positive integer"), optarg);
                  break;
            }
      }

      if (server == NULL)
            usage4 (_("Hostname was not supplied"));
      if (username == NULL)
            usage4 (_("User not specified"));
      if (password == NULL)
            usage4 (_("Password not specified"));
      if (config_file == NULL)
            usage4 (_("Configuration file not specified"));

      return OK;
}



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

      print_revision (progname, NP_VERSION);

      printf ("Copyright (c) 1999 Robert August Vincent II\n");
      printf (COPYRIGHT, copyright, email);

      printf("%s\n", _("Tests to see if a RADIUS server is accepting connections."));

  printf ("\n\n");

      print_usage ();

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

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

      printf (" %s\n", "-u, --username=STRING");
  printf ("    %s\n", _("The user to authenticate"));
  printf (" %s\n", "-p, --password=STRING");
  printf ("    %s\n", _("Password for autentication (SECURITY RISK)"));
  printf (" %s\n", "-n, --nas-id=STRING");
  printf ("    %s\n", _("NAS identifier"));
  printf (" %s\n", "-F, --filename=STRING");
  printf ("    %s\n", _("Configuration file"));
  printf (" %s\n", "-e, --expect=STRING");
  printf ("    %s\n", _("Response string to expect from the server"));
  printf (" %s\n", "-r, --retries=INTEGER");
  printf ("    %s\n", _("Number of times to retry a failed connection"));

      printf (_(UT_TIMEOUT), timeout_interval);

  printf ("\n");
  printf ("%s\n", _("This plugin tests a RADIUS server to see if it is accepting connections."));
  printf ("%s\n", _("The server to test must be specified in the invocation, as well as a user"));
  printf ("%s\n", _("name and password. A configuration file may also be present. The format of"));
  printf ("%s\n", _("the configuration file is described in the radiusclient library sources."));
      printf ("%s\n", _("The password option presents a substantial security issue because the"));
  printf ("%s\n", _("password can possibly be determined by careful watching of the command line"));
  printf ("%s\n", _("in a process listing. This risk is exacerbated because nagios will"));
  printf ("%s\n", _("run the plugin at regular predictable intervals. Please be sure that"));
  printf ("%s\n", _("the password used does not allow access to sensitive system resources."));

#ifdef NP_EXTRA_OPTS
  printf ("\n");
  printf ("%s\n", _("Notes:"));
  printf (_(UT_EXTRA_OPTS_NOTES));
#endif

      printf (_(UT_SUPPORT));
}



void
print_usage (void)
{
  printf (_("Usage:"));
      printf ("%s -H host -F config_file -u username -p password [-n nas-id] [-P port]\n\
                  [-t timeout] [-r retries] [-e expect]\n", progname);
}



int my_rc_read_config(char * a)
{
#ifdef HAVE_LIBRADIUSCLIENT_NG
      rch = rc_read_config(a);
      return (rch == NULL) ? 1 : 0;
#else
      return rc_read_config(a);
#endif
}

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