plugins/check_radius.c

   1 /******************************************************************************
   2 *
   3 * Nagios check_radius plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 1999-2006 nagios-plugins team
   7 *
   8 * Last Modified: $Date$
   9 *
  10 * Description:
  11 *
  12 * This file contains the check_radius plugin
  13 *
  14 *  Tests to see if a radius server is accepting connections.
  15 *
  16 *
  17 * License Information:
  18 *
  19 * This program is free software; you can redistribute it and/or modify
  20 * it under the terms of the GNU General Public License as published by
  21 * the Free Software Foundation; either version 2 of the License, or
  22 * (at your option) any later version.
  23 *
  24 * This program is distributed in the hope that it will be useful,
  25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27 * GNU General Public License for more details.
  28 *
  29 * You should have received a copy of the GNU General Public License
  30 * along with this program; if not, write to the Free Software
  31 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  32 *
  33 * $Id$
  34 *
  35 *******************************************************************************/
  36
  37 const char *progname = "check_radius";
  38 const char *revision = "$Revision$";
  39 const char *copyright = "2000-2006";
  40 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  41
  42 #include "common.h"
  43 #include "utils.h"
  44 #include "netutils.h"
  45
  46 #ifdef HAVE_LIBRADIUSCLIENT_NG
  47 #include <radiusclient-ng.h>
  48 rc_handle *rch = NULL;
  49 #else
  50 #include <radiusclient.h>
  51 #endif
  52
  53 int process_arguments (int, char **);
  54 void print_help (void);
  55 void print_usage (void);
  56
  57 /* libradiusclient(-ng) wrapper functions */
  58 #ifdef HAVE_LIBRADIUSCLIENT_NG
  59 #define my_rc_conf_str(a) rc_conf_str(rch,a)
  60 #define my_rc_send_server(a,b) rc_send_server(rch,a,b)
  61 #define my_rc_buildreq(a,b,c,d,e,f) rc_buildreq(rch,a,b,c,d,e,f)
  62 #define my_rc_own_ipaddress() rc_own_ipaddress(rch)
  63 #define my_rc_avpair_add(a,b,c,d) rc_avpair_add(rch,a,b,c,-1,d)
  64 #define my_rc_read_dictionary(a) rc_read_dictionary(rch, a)
  65 #else
  66 #define my_rc_conf_str(a) rc_conf_str(a)
  67 #define my_rc_send_server(a,b) rc_send_server(a, b)
  68 #define my_rc_buildreq(a,b,c,d,e,f) rc_buildreq(a,b,c,d,e,f)
  69 #define my_rc_own_ipaddress() rc_own_ipaddress()
  70 #define my_rc_avpair_add(a,b,c,d) rc_avpair_add(a, b, c, d)
  71 #define my_rc_read_dictionary(a) rc_read_dictionary(a)
  72 #endif
  73 int my_rc_read_config(char *);
  74
  75 char *server = NULL;
  76 char *username = NULL;
  77 char *password = NULL;
  78 char *nasid = NULL;
  79 char *expect = NULL;
  80 char *config_file = NULL;
  81 unsigned short port = PW_AUTH_UDP_PORT;
  82 int retries = 1;
  83 int verbose = FALSE;
  84 ENV *env = NULL;
  85
  86 /******************************************************************************
  87
  88 The (psuedo?)literate programming XML is contained within \@\@\- <XML> \-\@\@
  89 tags in the comments. With in the tags, the XML is assembled sequentially.
  90 You can define entities in tags. You also have all the #defines available as
  91 entities.
  92
  93 Please note that all tags must be lowercase to use the DocBook XML DTD.
  94
  95 @@-<article>
  96
  97 <sect1>
  98 <title>Quick Reference</title>
  99 <!-- The refentry forms a manpage -->
 100 <refentry>
 101 <refmeta>
 102 <manvolnum>5<manvolnum>
 103 </refmeta>
 104 <refnamdiv>
 105 <refname>&progname;</refname>
 106 <refpurpose>&SUMMARY;</refpurpose>
 107 </refnamdiv>
 108 </refentry>
 109 </sect1>
 110
 111 <sect1>
 112 <title>FAQ</title>
 113 </sect1>
 114
 115 <sect1>
 116 <title>Theory, Installation, and Operation</title>
 117
 118 <sect2>
 119 <title>General Description</title>
 120 <para>
 121 &DESCRIPTION;
 122 </para>
 123 </sect2>
 124
 125 <sect2>
 126 <title>Future Enhancements</title>
 127 <para>Todo List</para>
 128 <itemizedlist>
 129 <listitem>Add option to get password from a secured file rather than the command line</listitem>
 130 </itemizedlist>
 131 </sect2>
 132
 133
 134 <sect2>
 135 <title>Functions</title>
 136 -@@
 137 ******************************************************************************/
 138
 139
 140
 141 int
 142 main (int argc, char **argv)
 143 {
 144         UINT4 service;
 145         char msg[BUFFER_LEN];
 146         SEND_DATA data;
 147         int result = STATE_UNKNOWN;
 148         UINT4 client_id;
 149         char *str;
 150
 151         setlocale (LC_ALL, "");
 152         bindtextdomain (PACKAGE, LOCALEDIR);
 153         textdomain (PACKAGE);
 154
 155         if (process_arguments (argc, argv) == ERROR)
 156                 usage4 (_("Could not parse arguments"));
 157
 158         str = strdup ("dictionary");
 159         if ((config_file && my_rc_read_config (config_file)) ||
 160                         my_rc_read_dictionary (my_rc_conf_str (str)))
 161                 die (STATE_UNKNOWN, _("Config file error"));
 162
 163         service = PW_AUTHENTICATE_ONLY;
 164
 165         memset (&data, 0, sizeof(data));
 166         if (!(my_rc_avpair_add (&data.send_pairs, PW_SERVICE_TYPE, &service, 0) &&
 167                                 my_rc_avpair_add (&data.send_pairs, PW_USER_NAME, username, 0) &&
 168                                 my_rc_avpair_add (&data.send_pairs, PW_USER_PASSWORD, password, 0) &&
 169                                 (nasid==NULL || my_rc_avpair_add (&data.send_pairs, PW_NAS_IDENTIFIER, nasid, 0))))
 170                 die (STATE_UNKNOWN, _("Out of Memory?"));
 171
 172         /*
 173          * Fill in NAS-IP-Address
 174          */
 175
 176         if ((client_id = my_rc_own_ipaddress ()) == 0)
 177                 return (ERROR_RC);
 178
 179         if (my_rc_avpair_add (&(data.send_pairs), PW_NAS_IP_ADDRESS, &client_id, 0) ==
 180                         NULL) return (ERROR_RC);
 181
 182         my_rc_buildreq (&data, PW_ACCESS_REQUEST, server, port, (int)timeout_interval,
 183                      retries);
 184
 185         result = my_rc_send_server (&data, msg);
 186         rc_avpair_free (data.send_pairs);
 187         if (data.receive_pairs)
 188                 rc_avpair_free (data.receive_pairs);
 189
 190         if (result == TIMEOUT_RC)
 191                 die (STATE_CRITICAL, _("Timeout"));
 192         if (result == ERROR_RC)
 193                 die (STATE_CRITICAL, _("Auth Error"));
 194         if (result == BADRESP_RC)
 195                 die (STATE_WARNING, _("Auth Failed"));
 196         if (expect && !strstr (msg, expect))
 197                 die (STATE_WARNING, "%s", msg);
 198         if (result == OK_RC)
 199                 die (STATE_OK, _("Auth OK"));
 200         return (0);
 201 }
 202
 203
 204
 205 /* process command-line arguments */
 206 int
 207 process_arguments (int argc, char **argv)
 208 {
 209         int c;
 210
 211         int option = 0;
 212         static struct option longopts[] = {
 213                 {"hostname", required_argument, 0, 'H'},
 214                 {"port", required_argument, 0, 'P'},
 215                 {"username", required_argument, 0, 'u'},
 216                 {"password", required_argument, 0, 'p'},
 217                 {"nas-id", required_argument, 0, 'n'},
 218                 {"filename", required_argument, 0, 'F'},
 219                 {"expect", required_argument, 0, 'e'},
 220                 {"retries", required_argument, 0, 'r'},
 221                 {"timeout", required_argument, 0, 't'},
 222                 {"verbose", no_argument, 0, 'v'},
 223                 {"version", no_argument, 0, 'V'},
 224                 {"help", no_argument, 0, 'h'},
 225                 {0, 0, 0, 0}
 226         };
 227
 228         while (1) {
 229                 c = getopt_long (argc, argv, "+hVvH:P:F:u:p:n:t:r:e:", longopts,
 230                                                                          &option);
 231
 232                 if (c == -1 || c == EOF || c == 1)
 233                         break;
 234
 235                 switch (c) {
 236                 case '?':                                                                       /* print short usage statement if args not parsable */
 237                         usage5 ();
 238                 case 'h':                                                                       /* help */
 239                         print_help ();
 240                         exit (OK);
 241                 case 'V':                                                                       /* version */
 242                         print_revision (progname, revision);
 243                         exit (OK);
 244                 case 'v':                                                                       /* verbose mode */
 245                         verbose = TRUE;
 246                         break;
 247                 case 'H':                                                                       /* hostname */
 248                         if (is_host (optarg) == FALSE) {
 249                                 usage2 (_("Invalid hostname/address"), optarg);
 250                         }
 251                         server = optarg;
 252                         break;
 253                 case 'P':                                                                       /* port */
 254                         if (is_intnonneg (optarg))
 255                                 port = atoi (optarg);
 256                         else
 257                                 usage4 (_("Port must be a positive integer"));
 258                         break;
 259                 case 'u':                                                                       /* username */
 260                         username = optarg;
 261                         break;
 262                 case 'p':                                                                       /* password */
 263                         password = optarg;
 264                         break;
 265                 case 'n':                                                                       /* nas id */
 266                         nasid = optarg;
 267                         break;
 268                 case 'F':                                                                       /* configuration file */
 269                         config_file = optarg;
 270                         break;
 271                 case 'e':                                                                       /* expect */
 272                         expect = optarg;
 273                         break;
 274                 case 'r':                                                                       /* retries */
 275                         if (is_intpos (optarg))
 276                                 retries = atoi (optarg);
 277                         else
 278                                 usage4 (_("Number of retries must be a positive integer"));
 279                         break;
 280                 case 't':                                                                       /* timeout */
 281                         if (is_intpos (optarg))
 282                                 timeout_interval = atoi (optarg);
 283                         else
 284                                 usage2 (_("Timeout interval must be a positive integer"), optarg);
 285                         break;
 286                 }
 287         }
 288
 289         if (server == NULL)
 290                 usage4 (_("Hostname was not supplied"));
 291         if (username == NULL)
 292                 usage4 (_("User not specified"));
 293         if (password == NULL)
 294                 usage4 (_("Password not specified"));
 295         if (config_file == NULL)
 296                 usage4 (_("Configuration file not specified"));
 297
 298         return OK;
 299 }
 300
 301
 302
 303 void
 304 print_help (void)
 305 {
 306         char *myport;
 307         asprintf (&myport, "%d", PW_AUTH_UDP_PORT);
 308
 309         print_revision (progname, revision);
 310
 311         printf ("Copyright (c) 1999 Robert August Vincent II\n");
 312         printf (COPYRIGHT, copyright, email);
 313
 314         printf("%s\n", _("Tests to see if a radius server is accepting connections."));
 315
 316   printf ("\n\n");
 317
 318         print_usage ();
 319
 320         printf (_(UT_HELP_VRSN));
 321
 322         printf (_(UT_HOST_PORT), 'P', myport);
 323
 324         printf (" %s\n", "-u, --username=STRING");
 325   printf ("    %s\n", _("The user to authenticate"));
 326   printf (" %s\n", "-p, --password=STRING");
 327   printf ("    %s\n", _("Password for autentication (SECURITY RISK)"));
 328   printf (" %s\n", "-n, --nas-id=STRING");
 329   printf ("    %s\n", _("NAS identifier"));
 330   printf (" %s\n", "-F, --filename=STRING");
 331   printf ("    %s\n", _("Configuration file"));
 332   printf (" %s\n", "-e, --expect=STRING");
 333   printf ("    %s\n", _("Response string to expect from the server"));
 334   printf (" %s\n", "-r, --retries=INTEGER");
 335   printf ("    %s\n", _("Number of times to retry a failed connection"));
 336
 337         printf (_(UT_TIMEOUT), timeout_interval);
 338
 339         printf ("%s\n", _("This plugin tests a radius server to see if it is accepting connections."));
 340   printf ("%s\n", _("The server to test must be specified in the invocation, as well as a user"));
 341   printf ("%s\n", _("name and password. A configuration file may also be present. The format of"));
 342   printf ("%s\n", _("the configuration file is described in the radiusclient library sources."));
 343         printf ("%s\n", _("The password option presents a substantial security issue because the"));
 344   printf ("%s\n", _("password can be determined by careful watching of the command line in"));
 345   printf ("%s\n", _("a process listing.  This risk is exacerbated because nagios will"));
 346   printf ("%s\n", _("run the plugin at regular prdictable intervals.  Please be sure that"));
 347   printf ("%s\n", _("the password used does not allow access to sensitive system resources,"));
 348   printf ("%s\n", _("otherwise compormise could occur."));
 349
 350         printf (_(UT_SUPPORT));
 351 }
 352
 353
 354
 355 void
 356 print_usage (void)
 357 {
 358   printf (_("Usage:"));
 359         printf ("%s -H host -F config_file -u username -p password [-n nas-id] [-P port]\n\
 360                   [-t timeout] [-r retries] [-e expect]\n", progname);
 361 }
 362
 363
 364
 365 int my_rc_read_config(char * a)
 366 {
 367 #ifdef HAVE_LIBRADIUSCLIENT_NG
 368         rch = rc_read_config(a);
 369         return (rch == NULL) ? 1 : 0;
 370 #else
 371         return rc_read_config(a);
 372 #endif
 373 }