plugins/check_radius.c

   1 /*****************************************************************************
   2 *
   3 * Nagios check_radius plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 1999-2008 Nagios Plugins Development Team
   7 *
   8 * Description:
   9 *
  10 * This file contains the check_radius plugin
  11 *
  12 * Tests to see if a radius server is accepting connections.
  13 *
  14 *
  15 * This program is free software: you can redistribute it and/or modify
  16 * it under the terms of the GNU General Public License as published by
  17 * the Free Software Foundation, either version 3 of the License, or
  18 * (at your option) any later version.
  19 *
  20 * This program is distributed in the hope that it will be useful,
  21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 * GNU General Public License for more details.
  24 *
  25 * You should have received a copy of the GNU General Public License
  26 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27 *
  28 *
  29 *****************************************************************************/
  30
  31 const char *progname = "check_radius";
  32 const char *copyright = "2000-2008";
  33 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  34
  35 #include "common.h"
  36 #include "utils.h"
  37 #include "netutils.h"
  38
  39 #ifdef HAVE_LIBRADIUSCLIENT_NG
  40 #include <radiusclient-ng.h>
  41 rc_handle *rch = NULL;
  42 #else
  43 #include <radiusclient.h>
  44 #endif
  45
  46 int process_arguments (int, char **);
  47 void print_help (void);
  48 void print_usage (void);
  49
  50 /* libradiusclient(-ng) wrapper functions */
  51 #ifdef HAVE_LIBRADIUSCLIENT_NG
  52 #define my_rc_conf_str(a) rc_conf_str(rch,a)
  53 #define my_rc_send_server(a,b) rc_send_server(rch,a,b)
  54 #define my_rc_buildreq(a,b,c,d,e,f) rc_buildreq(rch,a,b,c,d,e,f)
  55 #define my_rc_own_ipaddress() rc_own_ipaddress(rch)
  56 #define my_rc_avpair_add(a,b,c,d) rc_avpair_add(rch,a,b,c,-1,d)
  57 #define my_rc_read_dictionary(a) rc_read_dictionary(rch, a)
  58 #else
  59 #define my_rc_conf_str(a) rc_conf_str(a)
  60 #define my_rc_send_server(a,b) rc_send_server(a, b)
  61 #define my_rc_buildreq(a,b,c,d,e,f) rc_buildreq(a,b,c,d,e,f)
  62 #define my_rc_own_ipaddress() rc_own_ipaddress()
  63 #define my_rc_avpair_add(a,b,c,d) rc_avpair_add(a, b, c, d)
  64 #define my_rc_read_dictionary(a) rc_read_dictionary(a)
  65 #endif
  66 int my_rc_read_config(char *);
  67
  68 char *server = NULL;
  69 char *username = NULL;
  70 char *password = NULL;
  71 char *nasid = NULL;
  72 char *expect = NULL;
  73 char *config_file = NULL;
  74 unsigned short port = PW_AUTH_UDP_PORT;
  75 int retries = 1;
  76 int verbose = FALSE;
  77 ENV *env = NULL;
  78
  79 /******************************************************************************
  80
  81 The (psuedo?)literate programming XML is contained within \@\@\- <XML> \-\@\@
  82 tags in the comments. With in the tags, the XML is assembled sequentially.
  83 You can define entities in tags. You also have all the #defines available as
  84 entities.
  85
  86 Please note that all tags must be lowercase to use the DocBook XML DTD.
  87
  88 @@-<article>
  89
  90 <sect1>
  91 <title>Quick Reference</title>
  92 <!-- The refentry forms a manpage -->
  93 <refentry>
  94 <refmeta>
  95 <manvolnum>5<manvolnum>
  96 </refmeta>
  97 <refnamdiv>
  98 <refname>&progname;</refname>
  99 <refpurpose>&SUMMARY;</refpurpose>
 100 </refnamdiv>
 101 </refentry>
 102 </sect1>
 103
 104 <sect1>
 105 <title>FAQ</title>
 106 </sect1>
 107
 108 <sect1>
 109 <title>Theory, Installation, and Operation</title>
 110
 111 <sect2>
 112 <title>General Description</title>
 113 <para>
 114 &DESCRIPTION;
 115 </para>
 116 </sect2>
 117
 118 <sect2>
 119 <title>Future Enhancements</title>
 120 <para>Todo List</para>
 121 <itemizedlist>
 122 <listitem>Add option to get password from a secured file rather than the command line</listitem>
 123 </itemizedlist>
 124 </sect2>
 125
 126
 127 <sect2>
 128 <title>Functions</title>
 129 -@@
 130 ******************************************************************************/
 131
 132
 133
 134 int
 135 main (int argc, char **argv)
 136 {
 137         UINT4 service;
 138         char msg[BUFFER_LEN];
 139         SEND_DATA data;
 140         int result = STATE_UNKNOWN;
 141         UINT4 client_id;
 142         char *str;
 143
 144         setlocale (LC_ALL, "");
 145         bindtextdomain (PACKAGE, LOCALEDIR);
 146         textdomain (PACKAGE);
 147
 148         /* Parse extra opts if any */
 149         argv=np_extra_opts (&argc, argv, progname);
 150
 151         if (process_arguments (argc, argv) == ERROR)
 152                 usage4 (_("Could not parse arguments"));
 153
 154         str = strdup ("dictionary");
 155         if ((config_file && my_rc_read_config (config_file)) ||
 156                         my_rc_read_dictionary (my_rc_conf_str (str)))
 157                 die (STATE_UNKNOWN, _("Config file error"));
 158
 159         service = PW_AUTHENTICATE_ONLY;
 160
 161         memset (&data, 0, sizeof(data));
 162         if (!(my_rc_avpair_add (&data.send_pairs, PW_SERVICE_TYPE, &service, 0) &&
 163                                 my_rc_avpair_add (&data.send_pairs, PW_USER_NAME, username, 0) &&
 164                                 my_rc_avpair_add (&data.send_pairs, PW_USER_PASSWORD, password, 0) &&
 165                                 (nasid==NULL || my_rc_avpair_add (&data.send_pairs, PW_NAS_IDENTIFIER, nasid, 0))))
 166                 die (STATE_UNKNOWN, _("Out of Memory?"));
 167
 168         /*
 169          * Fill in NAS-IP-Address
 170          */
 171
 172         if ((client_id = my_rc_own_ipaddress ()) == 0)
 173                 return (ERROR_RC);
 174
 175         if (my_rc_avpair_add (&(data.send_pairs), PW_NAS_IP_ADDRESS, &client_id, 0) ==
 176                         NULL) return (ERROR_RC);
 177
 178         my_rc_buildreq (&data, PW_ACCESS_REQUEST, server, port, (int)timeout_interval,
 179                      retries);
 180
 181         result = my_rc_send_server (&data, msg);
 182         rc_avpair_free (data.send_pairs);
 183         if (data.receive_pairs)
 184                 rc_avpair_free (data.receive_pairs);
 185
 186         if (result == TIMEOUT_RC)
 187                 die (STATE_CRITICAL, _("Timeout"));
 188         if (result == ERROR_RC)
 189                 die (STATE_CRITICAL, _("Auth Error"));
 190         if (result == BADRESP_RC)
 191                 die (STATE_WARNING, _("Auth Failed"));
 192         if (expect && !strstr (msg, expect))
 193                 die (STATE_WARNING, "%s", msg);
 194         if (result == OK_RC)
 195                 die (STATE_OK, _("Auth OK"));
 196         return (0);
 197 }
 198
 199
 200
 201 /* process command-line arguments */
 202 int
 203 process_arguments (int argc, char **argv)
 204 {
 205         int c;
 206
 207         int option = 0;
 208         static struct option longopts[] = {
 209                 {"hostname", required_argument, 0, 'H'},
 210                 {"port", required_argument, 0, 'P'},
 211                 {"username", required_argument, 0, 'u'},
 212                 {"password", required_argument, 0, 'p'},
 213                 {"nas-id", required_argument, 0, 'n'},
 214                 {"filename", required_argument, 0, 'F'},
 215                 {"expect", required_argument, 0, 'e'},
 216                 {"retries", required_argument, 0, 'r'},
 217                 {"timeout", required_argument, 0, 't'},
 218                 {"verbose", no_argument, 0, 'v'},
 219                 {"version", no_argument, 0, 'V'},
 220                 {"help", no_argument, 0, 'h'},
 221                 {0, 0, 0, 0}
 222         };
 223
 224         while (1) {
 225                 c = getopt_long (argc, argv, "+hVvH:P:F:u:p:n:t:r:e:", longopts,
 226                                                                          &option);
 227
 228                 if (c == -1 || c == EOF || c == 1)
 229                         break;
 230
 231                 switch (c) {
 232                 case '?':                                                                       /* print short usage statement if args not parsable */
 233                         usage5 ();
 234                 case 'h':                                                                       /* help */
 235                         print_help ();
 236                         exit (OK);
 237                 case 'V':                                                                       /* version */
 238                         print_revision (progname, NP_VERSION);
 239                         exit (OK);
 240                 case 'v':                                                                       /* verbose mode */
 241                         verbose = TRUE;
 242                         break;
 243                 case 'H':                                                                       /* hostname */
 244                         if (is_host (optarg) == FALSE) {
 245                                 usage2 (_("Invalid hostname/address"), optarg);
 246                         }
 247                         server = optarg;
 248                         break;
 249                 case 'P':                                                                       /* port */
 250                         if (is_intnonneg (optarg))
 251                                 port = atoi (optarg);
 252                         else
 253                                 usage4 (_("Port must be a positive integer"));
 254                         break;
 255                 case 'u':                                                                       /* username */
 256                         username = optarg;
 257                         break;
 258                 case 'p':                                                                       /* password */
 259                         password = strdup(optarg);
 260
 261                         /* Delete the password from process list */
 262                         while (*optarg != '\0') {
 263                                 *optarg = 'X';
 264                                 optarg++;
 265                         }
 266                         break;
 267                 case 'n':                                                                       /* nas id */
 268                         nasid = optarg;
 269                         break;
 270                 case 'F':                                                                       /* configuration file */
 271                         config_file = optarg;
 272                         break;
 273                 case 'e':                                                                       /* expect */
 274                         expect = optarg;
 275                         break;
 276                 case 'r':                                                                       /* retries */
 277                         if (is_intpos (optarg))
 278                                 retries = atoi (optarg);
 279                         else
 280                                 usage4 (_("Number of retries must be a positive integer"));
 281                         break;
 282                 case 't':                                                                       /* timeout */
 283                         if (is_intpos (optarg))
 284                                 timeout_interval = atoi (optarg);
 285                         else
 286                                 usage2 (_("Timeout interval must be a positive integer"), optarg);
 287                         break;
 288                 }
 289         }
 290
 291         if (server == NULL)
 292                 usage4 (_("Hostname was not supplied"));
 293         if (username == NULL)
 294                 usage4 (_("User not specified"));
 295         if (password == NULL)
 296                 usage4 (_("Password not specified"));
 297         if (config_file == NULL)
 298                 usage4 (_("Configuration file not specified"));
 299
 300         return OK;
 301 }
 302
 303
 304
 305 void
 306 print_help (void)
 307 {
 308         char *myport;
 309         asprintf (&myport, "%d", PW_AUTH_UDP_PORT);
 310
 311         print_revision (progname, NP_VERSION);
 312
 313         printf ("Copyright (c) 1999 Robert August Vincent II\n");
 314         printf (COPYRIGHT, copyright, email);
 315
 316         printf("%s\n", _("Tests to see if a RADIUS server is accepting connections."));
 317
 318   printf ("\n\n");
 319
 320         print_usage ();
 321
 322         printf (_(UT_HELP_VRSN));
 323         printf (_(UT_EXTRA_OPTS));
 324
 325         printf (_(UT_HOST_PORT), 'P', myport);
 326
 327         printf (" %s\n", "-u, --username=STRING");
 328   printf ("    %s\n", _("The user to authenticate"));
 329   printf (" %s\n", "-p, --password=STRING");
 330   printf ("    %s\n", _("Password for autentication (SECURITY RISK)"));
 331   printf (" %s\n", "-n, --nas-id=STRING");
 332   printf ("    %s\n", _("NAS identifier"));
 333   printf (" %s\n", "-F, --filename=STRING");
 334   printf ("    %s\n", _("Configuration file"));
 335   printf (" %s\n", "-e, --expect=STRING");
 336   printf ("    %s\n", _("Response string to expect from the server"));
 337   printf (" %s\n", "-r, --retries=INTEGER");
 338   printf ("    %s\n", _("Number of times to retry a failed connection"));
 339
 340         printf (_(UT_TIMEOUT), timeout_interval);
 341
 342   printf ("\n");
 343   printf ("%s\n", _("This plugin tests a RADIUS server to see if it is accepting connections."));
 344   printf ("%s\n", _("The server to test must be specified in the invocation, as well as a user"));
 345   printf ("%s\n", _("name and password. A configuration file may also be present. The format of"));
 346   printf ("%s\n", _("the configuration file is described in the radiusclient library sources."));
 347         printf ("%s\n", _("The password option presents a substantial security issue because the"));
 348   printf ("%s\n", _("password can possibly be determined by careful watching of the command line"));
 349   printf ("%s\n", _("in a process listing. This risk is exacerbated because nagios will"));
 350   printf ("%s\n", _("run the plugin at regular predictable intervals. Please be sure that"));
 351   printf ("%s\n", _("the password used does not allow access to sensitive system resources."));
 352
 353 #ifdef NP_EXTRA_OPTS
 354   printf ("\n");
 355   printf ("%s\n", _("Notes:"));
 356   printf (_(UT_EXTRA_OPTS_NOTES));
 357 #endif
 358
 359         printf (_(UT_SUPPORT));
 360 }
 361
 362
 363
 364 void
 365 print_usage (void)
 366 {
 367   printf (_("Usage:"));
 368         printf ("%s -H host -F config_file -u username -p password [-n nas-id] [-P port]\n\
 369                   [-t timeout] [-r retries] [-e expect]\n", progname);
 370 }
 371
 372
 373
 374 int my_rc_read_config(char * a)
 375 {
 376 #ifdef HAVE_LIBRADIUSCLIENT_NG
 377         rch = rc_read_config(a);
 378         return (rch == NULL) ? 1 : 0;
 379 #else
 380         return rc_read_config(a);
 381 #endif
 382 }