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| 4 | daniel-mar | 1 | <?php /* <ViaThinkSoftSignature> |
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| 22 | J2Zrd6Dd/7TAI1lcPuwUv4BxPP2o2ecsFVC2wi49v/HNPwrpGaRIocVG7XB2/tQvA |
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| 23 | A== |
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| 4 | daniel-mar | 24 | </ViaThinkSoftSignature> */ ?> |
| 2 | daniel-mar | 25 | <?php |
| 26 | |||
| 27 | /* |
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| 28 | * VNag - Nagios Framework for PHP |
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| 29 | * Developed by Daniel Marschall, ViaThinkSoft <www.viathinksoft.com> |
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| 30 | * Licensed under the terms of the Apache 2.0 license |
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| 31 | * |
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| 59 | daniel-mar | 32 | * Revision 2022-12-18 |
| 2 | daniel-mar | 33 | * |
| 34 | * Changelog: |
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| 35 | * 2018-08-01 1.0 Initial release |
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| 36 | * 2018-09-02 1.1 Added argument -e|--emptyok |
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| 37 | * Output a warning if the Linux user does not exist. |
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| 38 | * 2018-10-01 1.2 Fixed a bug where too many unnecessary requests were sent to ipinfo.io |
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| 39 | * Cache file location ~/.last_ipcache is now preferred |
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| 40 | * A token for ipinfo.io can now be provided |
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| 41 | * 2018-11-03 1.2.1 "system boot" lines are now excluded |
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| 59 | daniel-mar | 42 | * 2022-12-18 1.2.2 Use the new cache directory now |
| 2 | daniel-mar | 43 | */ |
| 44 | |||
| 45 | // QUE: should we allow usernames to have wildcards, regexes or comma separated? |
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| 46 | |||
| 47 | declare(ticks=1); |
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| 48 | |||
| 49 | class LastCheck extends VNag { |
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| 50 | private $argUser = null; |
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| 51 | private $argRegex = null; |
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| 52 | private $argWtmpFiles = null; |
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| 53 | private $argEmptyOk = null; |
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| 54 | private $argIpInfoToken = null; |
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| 55 | |||
| 56 | private $cache = null; |
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| 57 | private $cacheFile = null; |
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| 58 | private $cacheDirty = false; |
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| 59 | |||
| 60 | public function __construct() { |
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| 61 | parent::__construct(); |
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| 62 | |||
| 63 | if ($this->is_http_mode()) { |
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| 64 | // Don't allow the standard arguments via $_REQUEST |
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| 65 | $this->registerExpectedStandardArguments(''); |
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| 66 | } else { |
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| 67 | $this->registerExpectedStandardArguments('Vhtv'); |
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| 68 | } |
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| 69 | |||
| 70 | $this->addExpectedArgument($this->argUser = new VNagArgument('u', 'user', VNagArgument::VALUE_REQUIRED, 'user', 'The Linux username. If the argument is missing, all users will be checked.', null)); |
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| 71 | $this->addExpectedArgument($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)); |
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| 72 | $this->addExpectedArgument($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*')); |
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| 73 | $this->addExpectedArgument($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)); |
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| 74 | $this->addExpectedArgument($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)); |
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| 75 | |||
| 76 | $this->getHelpManager()->setPluginName('vnag_last'); |
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| 77 | $this->getHelpManager()->setVersion('1.2'); |
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| 78 | $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.'); |
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| 79 | $this->getHelpManager()->setCopyright('Copyright (C) 2011-$CURYEAR$ Daniel Marschall, ViaThinkSoft.'); |
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| 80 | $this->getHelpManager()->setSyntax('$SCRIPTNAME$ [-v] [-e] [-u username] [-R regex] [--ipInfoToken token]'); |
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| 81 | $this->getHelpManager()->setFootNotes('If you encounter bugs, please contact ViaThinkSoft at www.viathinksoft.com'); |
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| 82 | |||
| 59 | daniel-mar | 83 | $this->cacheFile = $this->get_cache_dir() . '/.last_ip_cache'; |
| 84 | if (!file_exists($this->cacheFile)) @touch($this->cacheFile); |
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| 2 | daniel-mar | 85 | $this->cache = $this->cacheFile ? json_decode(file_get_contents($this->cacheFile),true) : array(); |
| 86 | } |
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| 87 | |||
| 88 | public function __destruct() { |
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| 89 | if ($this->cacheFile && $this->cacheDirty) { |
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| 90 | @file_put_contents($this->cacheFile, json_encode($this->cache)); |
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| 91 | } |
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| 92 | } |
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| 93 | |||
| 94 | private function getCountryAndOrg($ip) { |
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| 95 | if (isset($this->cache[$ip])) return $this->cache[$ip]; |
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| 96 | |||
| 97 | $url = 'https://ipinfo.io/'.urlencode($ip).'/json'; |
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| 98 | $token = $this->argIpInfoToken->getValue(); |
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| 99 | if ($token) $url .= '?token='.urlencode($token); |
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| 100 | |||
| 101 | // fwrite(STDERR, "Note: Will query $url\n"); |
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| 102 | $cont = file_get_contents($url); |
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| 103 | if (!$cont) return array(); |
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| 104 | if (!($data = @json_decode($cont, true))) return array(); |
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| 105 | if (isset($data['error'])) return array(); |
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| 106 | |||
| 107 | if (isset($data['bogon']) && ($data['bogon'])) { |
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| 108 | // Things like 127.0.0.1 do not belong to anyone |
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| 109 | $res = array(); |
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| 110 | } else { |
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| 111 | $res = array(); |
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| 112 | if (isset($data['hostname'])) $res[] = $data['hostname']; |
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| 113 | if (isset($data['country'])) $res[] = $data['country']; |
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| 114 | list($as, $orgName) = explode(' ', $data['org'], 2); |
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| 115 | $res[] = $as; |
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| 116 | $res[] = $orgName; |
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| 117 | } |
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| 118 | |||
| 119 | $this->cache[$ip] = $res; |
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| 120 | $this->cacheDirty = true; |
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| 121 | return $res; |
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| 122 | } |
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| 123 | |||
| 124 | private function getLastLoginIPs($username) { |
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| 125 | $cont = ''; |
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| 126 | $files = glob($this->argWtmpFiles->getValue()); |
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| 127 | foreach ($files as $file) { |
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| 128 | if (trim($username) == '') { |
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| 129 | $cont .= shell_exec('last -f '.escapeshellarg($file).' -F -w '); // all users |
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| 130 | } else { |
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| 131 | $cont .= shell_exec('last -f '.escapeshellarg($file).' -F -w '.escapeshellarg($username)); |
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| 132 | } |
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| 133 | } |
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| 134 | preg_match_all('@^(\S+)\s+(\S+)\s+(\S+)\s+(.+)$@ismU', $cont, $m, PREG_SET_ORDER); |
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| 135 | foreach ($m as $key => &$a) { |
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| 136 | if (($a[2] === 'system') && ($a[3] === 'boot')) { |
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| 137 | // reboot system boot 4.9.0-8-amd64 Fri Oct 12 02:10 still running |
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| 138 | unset($m[$key]); |
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| 139 | } else if ($a[2] === 'begins') { |
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| 140 | // wtmp.1 begins Fri Oct 12 02:10:43 2018 |
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| 141 | unset($m[$key]); |
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| 142 | } else { |
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| 143 | array_shift($a); |
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| 144 | } |
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| 145 | } |
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| 146 | return $m; |
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| 147 | } |
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| 148 | |||
| 149 | protected function cbRun() { |
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| 150 | if (!`which which`) { |
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| 151 | throw new VNagException("Program 'which' is not installed on your system"); |
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| 152 | } |
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| 153 | |||
| 154 | if (!`which last`) { |
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| 155 | throw new VNagException("Program 'last' (usually included in package smartmontools) is not installed on your system"); |
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| 156 | } |
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| 157 | |||
| 158 | $username = $this->argUser->available() ? $this->argUser->getValue() : ''; |
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| 159 | $regex = $this->argRegex->available() ? $this->argRegex->getValue() : null; |
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| 160 | |||
| 161 | if (($username != '') && function_exists('posix_getpwnam') && !posix_getpwnam($username)) { |
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| 162 | $this->setStatus(VNag::STATUS_WARNING); |
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| 163 | $this->addVerboseMessage("WARNING: Currently, there is no Linux user with name '$username'.", VNag::VERBOSITY_SUMMARY); |
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| 164 | } |
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| 165 | |||
| 166 | $count_total = 0; |
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| 167 | $count_ok = 0; |
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| 168 | $count_warning = 0; |
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| 169 | |||
| 170 | foreach ($this->getLastLoginIPs($username) as list($username, $pts, $ip, $times)) { |
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| 36 | daniel-mar | 171 | // IP ":pts/0:S.0" means that there is a screen session |
| 172 | if (strpos($ip,':pts/') === 0) continue; |
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| 173 | |||
| 2 | daniel-mar | 174 | $count_total++; |
| 175 | |||
| 176 | $fields = $this->getCountryAndOrg($ip); |
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| 177 | $fields[] = $ip; |
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| 178 | |||
| 179 | if (is_null($regex)) { |
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| 180 | // No regex. Just show the logins for information (status stays VNag::STATUS_UNKNOWN) |
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| 181 | $this->addVerboseMessage("INFO: ".implode(' ',$fields)." @ $username, $pts $times", VNag::VERBOSITY_ADDITIONAL_INFORMATION); |
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| 182 | } else { |
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| 183 | $match = false; |
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| 184 | foreach ($fields as $f) { |
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| 185 | if (preg_match($regex, $f, $dummy)) { |
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| 186 | $match = true; |
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| 187 | break; |
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| 188 | } |
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| 189 | } |
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| 190 | |||
| 191 | if ($match) { |
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| 192 | $count_ok++; |
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| 193 | $this->addVerboseMessage("OK: ".implode(' ',$fields)." @ $username $pts $times", VNag::VERBOSITY_ADDITIONAL_INFORMATION); |
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| 194 | $this->setStatus(VNag::STATUS_OK); |
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| 195 | } else { |
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| 196 | $count_warning++; |
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| 197 | $this->addVerboseMessage("WARNING: ".implode(' ',$fields)." @ $username $pts $times", VNag::VERBOSITY_SUMMARY); |
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| 198 | $this->setStatus(VNag::STATUS_WARNING); |
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| 199 | } |
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| 200 | } |
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| 201 | } |
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| 202 | |||
| 203 | if (is_null($regex)) { |
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| 204 | $this->setHeadline("Checked $count_total logins (No checks done because argument 'Regex' is missing)"); |
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| 205 | } else { |
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| 206 | if (($count_total == 0) && ($this->argEmptyOk->count() > 0)) { |
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| 207 | $this->setStatus(VNag::STATUS_OK); |
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| 208 | } |
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| 209 | $this->setHeadline("Checked $count_total logins ($count_ok OK, $count_warning Warning)"); |
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| 210 | } |
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| 211 | } |
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| 212 | } |