<?php
/*
* VNag - Nagios Framework for PHP
* Developed by Daniel Marschall, ViaThinkSoft <www.viathinksoft.com>
* Licensed under the terms of the Apache 2.0 license
*
* Revision 2023-10-13
*/
// QUE: should we allow usernames to have wildcards, regexes or comma separated?
declare(ticks=1);
class LastCheck extends VNag {
private $argUser = null;
private $argRegex = null;
private $argWtmpFiles = null;
private $argEmptyOk = null;
private $argIpInfoToken = null;
private $cache = null;
private $cacheFile = null;
private $cacheDirty = false;
public function __construct() {
parent::__construct();
if ($this->is_http_mode()) {
// Don't allow the standard arguments via $_REQUEST
$this->registerExpectedStandardArguments('');
} else {
$this->registerExpectedStandardArguments('Vhtv');
}
$this->addExpectedArgument($this->argUser = new VNagArgument('u', 'user', VNagArgument::VALUE_REQUIRED, 'user', 'The Linux username. If the argument is missing, all users will be checked.', null));
$this->addExpectedArgument($this->argRegex = new VNagArgument('R', 'regex', VNagArgument::VALUE_REQUIRED, 'regex', 'The regular expression (in PHP: preg_match) which is applied on IP, Hostname, Country, AS number or ISP name. If the regular expression matches, the login will be accepted, otherweise an alert will be triggered. Example: /DE/ismU or /Telekom/ismU', null));
$this->addExpectedArgument($this->argWtmpFiles = new VNagArgument('f', 'wtmpfile', VNagArgument::VALUE_REQUIRED, 'wtmpfile', 'Filemask of the wtmp file (important if you use logrotate), e.g. \'/var/log/wtmp*\'', '/var/log/wtmp*'));
$this->addExpectedArgument($this->argEmptyOk = new VNagArgument('e', 'emptyok', VNagArgument::VALUE_FORBIDDEN, null, 'Treat an empty result (e.g. empty wtmp file after rotation) as success; otherwise treat it as status "Unknown"', null));
$this->addExpectedArgument($this->argIpInfoToken = new VNagArgument(null, 'ipInfoToken', VNagArgument::VALUE_REQUIRED, 'token', 'If you have a token for ipinfo.io, please enter it here. Without token, you can query the service approx 1,000 times per day (which should be enough)', null));
$this->getHelpManager()->setPluginName('vnag_last');
$this->getHelpManager()->setVersion('2023-10-13');
$this->getHelpManager()->setShortDescription('This plugin checks the logs of the tool "LAST" an warns when users have logged in with an unexpected IP/Country/ISP.');
$this->getHelpManager()->setCopyright('Copyright (C) 2011-$CURYEAR$ Daniel Marschall, ViaThinkSoft.');
$this->getHelpManager()->setSyntax('$SCRIPTNAME$ [-v] [-e] [-u username] [-R regex] [--ipInfoToken token]');
$this->getHelpManager()->setFootNotes('If you encounter bugs, please contact ViaThinkSoft at www.viathinksoft.com');
$this->cacheFile = $this->get_cache_dir().'/'.hash('sha256','LastCheck:last_ip_cache'); }
public function __destruct() {
if ($this->cacheFile && $this->cacheDirty) {
}
}
private function getCountryAndOrg($ip) {
if (isset($this->cache[$ip])) return $this->cache[$ip];
$url = 'https://ipinfo.io/'.urlencode($ip).'/json'; $token = $this->argIpInfoToken->getValue();
if ($token) $url .= '?token='.urlencode($token);
// fwrite(STDERR, "Note: Will query $url\n");
$cont = $this->url_get_contents($url);
if ($cont === false) return array();
if (isset($data['bogon']) && ($data['bogon'])) { // Things like 127.0.0.1 do not belong to anyone
} else {
if (isset($data['hostname'])) $res[] = $data['hostname']; if (isset($data['country'])) $res[] = $data['country']; $res[] = $as;
$res[] = $orgName;
}
$this->cache[$ip] = $res;
$this->cacheDirty = true;
return $res;
}
private function getLastLoginIPs($username) {
$cont = '';
$files = glob($this->argWtmpFiles->getValue()); foreach ($files as $file) {
if (trim($username) == '') { } else {
}
}
preg_match_all('@^(\S+)\s+(\S+)\s+(\S+)\s+(.+)$@ismU', $cont, $m, PREG_SET_ORDER
); foreach ($m as $key => &$a) {
if (($a[2] === 'system') && ($a[3] === 'boot')) {
// reboot system boot 4.9.0-8-amd64 Fri Oct 12 02:10 still running
// reboot system boot 6.1.0-11-amd64 Fri Sep 8 13:10:27 2023 - Sat Sep 9 17:40:50 2023 (1+04:30)
//} else if ($a[2] === 'begins') {
} else if (substr($a[1],0,4) === 'wtmp') { // wtmp.1 begins Fri Oct 12 02:10:43 2018 (English)
// wtmp beginnt Wed Aug 16 11:43:03 2023 (German)
} else {
}
}
return $m;
}
protected function cbRun() {
if (!`which which`) {
throw new VNagException("Program 'which' is not installed on your system");
}
if (!`which last`) {
throw new VNagException("Program 'last' (usually included in package smartmontools) is not installed on your system");
}
$username = $this->argUser->available() ? $this->argUser->getValue() : '';
$regex = $this->argRegex->available() ? $this->argRegex->getValue() : null;
$this->setStatus(VNag::STATUS_WARNING);
$this->addVerboseMessage("WARNING: Currently, there is no Linux user with name '$username'.", VNag::VERBOSITY_SUMMARY);
}
$count_total = 0;
$count_ok = 0;
$count_warning = 0;
foreach ($this->getLastLoginIPs($username) as list($username, $pts, $ip, $times)) { // IP ":pts/0:S.0" means that there is a screen session
if (strpos($ip,':pts/') === 0) continue;
$count_total++;
$fields = $this->getCountryAndOrg($ip);
$fields[] = $ip;
// No regex. Just show the logins for information (status stays VNag::STATUS_UNKNOWN)
$this->addVerboseMessage("INFO: ".implode(' ',$fields)." @ $username, $pts $times", VNag
::VERBOSITY_ADDITIONAL_INFORMATION); } else {
$match = false;
foreach ($fields as $f) {
$match = true;
break;
}
}
if ($match) {
$count_ok++;
$this->addVerboseMessage("OK: ".implode(' ',$fields)." @ $username $pts $times", VNag
::VERBOSITY_ADDITIONAL_INFORMATION); $this->setStatus(VNag::STATUS_OK);
} else {
$count_warning++;
$this->addVerboseMessage("WARNING: ".implode(' ',$fields)." @ $username $pts $times", VNag
::VERBOSITY_SUMMARY); $this->setStatus(VNag::STATUS_WARNING);
}
}
}
$this->setHeadline("Checked $count_total logins (No checks done because argument 'Regex' is missing)");
} else {
if (($count_total == 0) && ($this->argEmptyOk->count() > 0)) { $this->setStatus(VNag::STATUS_OK);
}
$this->setHeadline("Checked $count_total logins ($count_ok OK, $count_warning Warning)");
}
}
}