errorReporting == LAMCfgMain::ERROR_REPORTING_DEFAULT)) { ini_set('error_reporting', 'E_ALL & ~E_NOTICE'); } elseif ($_SESSION['cfgMain']->errorReporting == LAMCfgMain::ERROR_REPORTING_ALL) { ini_set('error_reporting', E_ALL | E_STRICT); ini_set('display_errors', 'On'); } // check session id if (! isset($_SESSION["sec_session_id"]) || ($_SESSION["sec_session_id"] != session_id())) { // session id is invalid logNewMessage(LOG_WARNING, "Invalid session ID, access denied (" . getClientIPForLogging() . ")"); if ($redirectToLogin) { logoffAndBackToLoginPage(); } else { die(); } } // check if client IP has not changed if (!isset($_SESSION["sec_client_ip"]) || ($_SESSION["sec_client_ip"] != $_SERVER['REMOTE_ADDR'])) { // IP is invalid logNewMessage(LOG_WARNING, "Client IP changed, access denied (" . getClientIPForLogging() . ")"); die(); } // check if session time has not expired if (($_SESSION['sec_sessionTime'] + (60 * $_SESSION['cfgMain']->sessionTimeout)) > time()) { // ok, update time $_SESSION['sec_sessionTime'] = time(); } elseif ($redirectToLogin) { // session expired, logoff user logoffAndBackToLoginPage(); } else { return false; } setSSLCaCert(); return true; } /** * Checks if the client's IP address is on the list of allowed IPs. * The script is stopped if the host is not valid. * */ function checkClientIP() { if (isset($_SESSION['cfgMain'])) { $cfg = $_SESSION['cfgMain']; } else { $cfg = new LAMCfgMain(); } $allowedHosts = $cfg->allowedHosts; $url = getCallingURL(); if ((strpos($url, '/selfService/selfService') !== false) || ((strpos($url, '/misc/ajax.php?') !== false) && strpos($url, 'selfservice=1') !== false)) { // self service pages have separate IP list $allowedHosts = $cfg->allowedHostsSelfService; } // skip test if no hosts are defined if (empty($allowedHosts) || empty($_SERVER['REMOTE_ADDR'])) { return; } $allowedHosts = explode(",", $allowedHosts); $grantAccess = false; for ($i = 0; $i < sizeof($allowedHosts); $i++) { $host = $allowedHosts[$i]; $ipRegex = '/^[0-9a-z\\.:\\*]+$/i'; if (!preg_match($ipRegex, $host)) { continue; } $hostRegex = str_replace(".", "\\.", $host); $hostRegex = '/^' . str_replace("*", ".*", $hostRegex) . '$/'; $clientIP = $_SERVER['REMOTE_ADDR']; if (preg_match($hostRegex, $clientIP)) { // client is allowed to access LAM $grantAccess = true; } } // stop script is client may not access LAM if (!$grantAccess) { logNewMessage(LOG_WARNING, "Invalid client IP, access denied (" . getClientIPForLogging() . ")"); die(); } } /** * Logs off the user and displays the login page. * */ function logoffAndBackToLoginPage() { // log message if (isset($_SESSION['ldap'])) { $ldapUser = $_SESSION['ldap']->decrypt_login(); logNewMessage(LOG_WARNING, 'Session of user ' . $ldapUser[0] . ' expired.'); // close LDAP connection @$_SESSION["ldap"]->destroy(); } elseif (isset($_SESSION['selfService_clientDN']) || (strpos($_SERVER['REQUEST_URI'], '/selfService/') !== false)) { logNewMessage(LOG_WARNING, 'Self service session of DN ' . lamDecrypt($_SESSION['selfService_clientDN'], 'SelfService') . ' expired.'); } // delete key and iv in cookie if (function_exists('openssl_random_pseudo_bytes')) { setcookie("Key", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 0, "/", null, null, true); setcookie("IV", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 0, "/", null, null, true); } // link back to login page $paths = array('./', '../', '../../', '../../../', '../../../../'); $page = 'login.php'; $pageSuffix = '?expired=yes'; if (isset($_SESSION['selfService_clientDN']) || (strpos($_SERVER['REQUEST_URI'], '/selfService/') !== false)) { $scope = $_GET['scope']; $name = $_GET['name']; if (!preg_match('/^[0-9a-zA-Z _-]+$/', $scope) || !preg_match('/^[0-9a-zA-Z _-]+$/', $name)) { logNewMessage(LOG_ERR, 'GET parameters invalid: ' . $name . ' ' . $scope); die(); } $page = 'selfServiceLogin.php'; $pageSuffix = '?expired=yes&scope=' . $scope . '&name=' . $name; } for ($i = 0; $i < sizeof($paths); $i++) { if (file_exists($paths[$i] . $page)) { $page = $paths[$i] . $page; break; } } $page .= $pageSuffix; echo $_SESSION['header']; echo "\n"; echo "\n"; echo "\n"; // print JavaScript refresh echo "\n"; // print link if refresh does not work echo "

\n"; echo "" . _("Your session expired, click here to go back to the login page.") . "\n"; echo "

\n"; echo "\n"; echo "\n"; // destroy session session_destroy(); unset($_SESSION); die(); } /** * Returns if debug messages are to be logged. * * @return boolean debug enabled */ function isDebugLoggingEnabled() { if (isset($_SESSION['cfgMain'])) { $cfg = $_SESSION['cfgMain']; } else { $cfg = new LAMCfgMain(); } return $cfg->logLevel >= LOG_DEBUG; } /** * Puts a new message in the log file. * * @param string $level log level (LOG_DEBUG, LOG_NOTICE, LOG_WARNING, LOG_ERR) * @param string $message log message */ function logNewMessage($level, $message) { $possibleLevels = array(LOG_DEBUG => 'DEBUG', LOG_NOTICE => 'NOTICE', LOG_WARNING => 'WARNING', LOG_ERR => 'ERROR'); if (!in_array($level, array_keys($possibleLevels))) { StatusMessage('ERROR', 'Invalid log level!', $level); } if (isset($_SESSION['cfgMain'])) { $cfg = $_SESSION['cfgMain']; } else { $cfg = new LAMCfgMain(); } // check if logging is disabled if (($cfg->logDestination == 'NONE') // check if log level is high enough || ($cfg->logLevel < $level)) { return; } // ok to log, build log message $prefix = "LDAP Account Manager (" . session_id() . ' - ' . getClientIPForLogging() . ") - " . $possibleLevels[$level] . ": "; $message = $prefix . $message; // Syslog logging if ($cfg->logDestination == 'SYSLOG') { syslog($level, $message); } // log to file else { @touch($cfg->logDestination); if (is_writable($cfg->logDestination)) { $file = fopen($cfg->logDestination, 'a'); if ($file) { $timeZone = 'UTC'; $sysTimeZone = @date_default_timezone_get(); if (!empty($sysTimeZone)) { $timeZone = $sysTimeZone; } $time = new DateTime(null, new DateTimeZone($timeZone)); fwrite($file, $time->format('Y-m-d H:i:s') . ': ' . $message . "\n"); fclose($file); } } else { StatusMessage('ERROR', 'Unable to write to log file!', $cfg->logDestination); } } } /** * Checks if write access to LDAP is allowed. * * @param String $scope account type (e.g. user) * @return boolean true, if allowed */ function checkIfWriteAccessIsAllowed($scope = null) { if (!isset($_SESSION['config'])) { return false; } if ($_SESSION['config']->getAccessLevel() >= LAMConfig::ACCESS_ALL) { $typeSettings = $_SESSION['config']->get_typeSettings(); if (($scope == null) // check if write for this type is allowed || !isset($typeSettings['readOnly_' . $scope]) || !$typeSettings['readOnly_' . $scope]) { return true; } } return false; } /** * Checks if passwords may be changed. * * @return boolean true, if allowed */ function checkIfPasswordChangeIsAllowed() { if (!isset($_SESSION['config'])) { return false; } if ($_SESSION['config']->getAccessLevel() >= LAMConfig::ACCESS_PASSWORD_CHANGE) { return true; } return false; } /** * Checks if it is allowed to create new LDAP entries of the given type. * This also checks if general write access is enabled. * * @param String $scope account type (e.g. 'user') * @return boolean true, if new entries are allowed */ function checkIfNewEntriesAreAllowed($scope) { if (!isLAMProVersion()) { return true; } if (!isset($_SESSION['config']) || empty($scope)) { return false; } $typeSettings = $_SESSION['config']->get_typeSettings(); if (isset($typeSettings['hideNewButton_' . $scope]) && $typeSettings['hideNewButton_' . $scope]) { return false; } return checkIfWriteAccessIsAllowed(); } /** * Checks if it is allowed to delete LDAP entries of the given type. * * @param String $scope account type (e.g. 'user') * @return boolean true, if entries may be deleted */ function checkIfDeleteEntriesIsAllowed($scope) { if (!isLAMProVersion()) { return true; } if (!isset($_SESSION['config']) || empty($scope)) { return false; } $typeSettings = $_SESSION['config']->get_typeSettings(); if (isset($typeSettings['hideDeleteButton_' . $scope]) && $typeSettings['hideDeleteButton_' . $scope]) { return false; } return checkIfWriteAccessIsAllowed(); } /** * Checks if the password fulfills the password policies. * * @param String $password password * @param String $userName user name * @param array $otherUserAttrs user's first/last name * @return mixed true if ok, string with error message if not valid */ function checkPasswordStrength($password, $userName, $otherUserAttrs) { if ($password == null) { $password = ""; } if (isset($_SESSION['cfgMain'])) { $cfg = $_SESSION['cfgMain']; } else { $cfg = new LAMCfgMain(); } // check length if (strlen($password) < $cfg->passwordMinLength) { return sprintf(_('The password is too short. You have to enter at least %s characters.'), $cfg->passwordMinLength); } // get number of characers per character class $lower = 0; $upper = 0; $numeric = 0; $symbols = 0; for ($i = 0; $i < strlen($password); $i++) { if (preg_match("/[a-z]/", $password[$i])) { $lower++; } if (preg_match("/[A-Z]/", $password[$i])) { $upper++; } if (preg_match("/[0-9]/", $password[$i])) { $numeric++; } if (preg_match("/[^a-z0-9]/i", $password[$i])) { $symbols++; } } $rulesMatched = 0; $rulesFailed = 0; // check lower case if (($cfg->checkedRulesCount == -1) && ($lower < $cfg->passwordMinLower)) { return sprintf(_('The password is too weak. You have to enter at least %s lower case characters.'), $cfg->passwordMinLower); } if ($lower < $cfg->passwordMinLower) { $rulesFailed++; } else { $rulesMatched++; } // check upper case if (($cfg->checkedRulesCount == -1) && ($upper < $cfg->passwordMinUpper)) { return sprintf(_('The password is too weak. You have to enter at least %s upper case characters.'), $cfg->passwordMinUpper); } if ($upper < $cfg->passwordMinUpper) { $rulesFailed++; } else { $rulesMatched++; } // check numeric if (($cfg->checkedRulesCount == -1) && ($numeric < $cfg->passwordMinNumeric)) { return sprintf(_('The password is too weak. You have to enter at least %s numeric characters.'), $cfg->passwordMinNumeric); } if ($numeric < $cfg->passwordMinNumeric) { $rulesFailed++; } else { $rulesMatched++; } // check symbols if (($cfg->checkedRulesCount == -1) && ($symbols < $cfg->passwordMinSymbol)) { return sprintf(_('The password is too weak. You have to enter at least %s symbolic characters.'), $cfg->passwordMinSymbol); } if ($symbols < $cfg->passwordMinSymbol) { $rulesFailed++; } else { $rulesMatched++; } // check classes $classes = 0; if ($lower > 0) { $classes++; } if ($upper > 0) { $classes++; } if ($numeric > 0) { $classes++; } if ($symbols > 0) { $classes++; } if (($cfg->checkedRulesCount == -1) && ($classes < $cfg->passwordMinClasses)) { return sprintf(_('The password is too weak. You have to enter at least %s different character classes (upper/lower case, numbers and symbols).'), $cfg->passwordMinClasses); } if ($classes < $cfg->passwordMinClasses) { $rulesFailed++; } else { $rulesMatched++; } // check rules count if (($cfg->checkedRulesCount != -1) && ($rulesMatched < $cfg->checkedRulesCount)) { return sprintf(_('The password is too weak. It needs to match at least %s password complexity rules.'), $cfg->checkedRulesCount); } // check user name if (($cfg->passwordMustNotContainUser == 'true') && !empty($userName)) { $pwdLow = strtolower($password); $userLow = strtolower($userName); if (strpos($pwdLow, $userLow) !== false) { return _('The password is too weak. You may not use the user name as part of the password.'); } } // check part of user name and additional attributes if (($cfg->passwordMustNotContain3Chars == 'true') && (!empty($userName) || !empty($otherUserAttrs))) { $pwdLow = strtolower($password); // check if contains part of user name if (!empty($userName) && (strlen($userName) > 2)) { $userLow = strtolower($userName); for ($i = 0; $i < strlen($userLow) - 3; $i++) { $part = substr($userLow, 0, 3); if (strpos($pwdLow, $part) !== false) { return _('The password is too weak. You may not use parts of the user name for the password.'); } } } // check other attributes foreach ($otherUserAttrs as $other) { $low = strtolower($other); for ($i = 0; $i < strlen($low) - 3; $i++) { $part = substr($low, 0, 3); if (strpos($pwdLow, $part) !== false) { return _('The password is too weak. You may not use parts of user attributes for the password.'); } } } } // check external password service if (!checkPwdWithExternalPasswordService($cfg, $password)) { return _('Your selected password is known to be insecure.'); } return true; } /** * Checks the password against the external password service. * * @param LAMCfgMain $cfg main configuration * @param string $password password * @return boolean password accepted as secure */ function checkPwdWithExternalPasswordService($cfg, $password) { if (!function_exists('curl_init') || empty($cfg->externalPwdCheckUrl)) { return true; } $sha1 = sha1($password); $sha1Prefix = substr($sha1, 0, 5); $sha1Suffix = substr($sha1, 5); $curl = curl_init(); curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); $url = $cfg->externalPwdCheckUrl; $url = str_replace('{SHA1PREFIX}', $sha1Prefix, $url); curl_setopt($curl, CURLOPT_URL, $url); $results = curl_exec($curl); $code = curl_errno($curl); if ($code) { logNewMessage(LOG_ERR, 'Error calling the external password service at ' . $url . '. ' . curl_error($curl)); return true; } curl_close($curl); if (empty($results)) { return true; } $results = explode("\n", $results); foreach ($results as $result) { if (stripos($result, $sha1Suffix . ':') !== false) { return false; } } return true; } /** * Checks if the given tool is active. * Otherwise, an error message is logged and the execution is stopped (die()). * * @param String $tool tool class name (e.g. toolFileUpload) */ function checkIfToolIsActive($tool) { $toolSettings = $_SESSION['config']->getToolSettings(); // check if hidden by config if (isset($toolSettings['tool_hide_' . $tool]) && ($toolSettings['tool_hide_' . $tool] == 'true')) { logNewMessage(LOG_ERR, 'Unauthorized access to tool ' . $tool . ' denied.'); die(); } } /** * Returns if the user is logged in. * * @return boolean is logged in */ function isLoggedIn() { return (isset($_SESSION['loggedIn']) && ($_SESSION['loggedIn'] === true)); } /** * Returns the client IP and comma separated proxy IPs if any (HTTP_X_FORWARDED_FOR, HTTP_X_REAL_IP). * * @return String client IP (e.g. 10.10.10.10,11.11.11.11) */ function getClientIPForLogging() { $ip = empty($_SERVER['REMOTE_ADDR']) ? '' : $_SERVER['REMOTE_ADDR']; if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']) && (strlen($_SERVER['HTTP_X_FORWARDED_FOR']) < 100)) { $ip .= ',' . $_SERVER['HTTP_X_FORWARDED_FOR']; } if (!empty($_SERVER['HTTP_X_REAL_IP']) && (strlen($_SERVER['HTTP_X_REAL_IP']) < 100)) { $ip .= ',' . $_SERVER['HTTP_X_REAL_IP']; } return $ip; } /** * Adds a security token to the session to prevent CSRF attacks. * * @param boolean $overwrite overwrite existing token */ function addSecurityTokenToSession($overwrite = true) { if (!empty($_SESSION[getSecurityTokenName()]) && !$overwrite) { return; } $_SESSION[getSecurityTokenName()] = getRandomNumber(); } /** * Checks if the security token from SESSION matches POST data. */ function validateSecurityToken() { if (empty($_POST)) { return; } if (empty($_POST[getSecurityTokenName()]) || ($_POST[getSecurityTokenName()] != $_SESSION[getSecurityTokenName()])) { logNewMessage(LOG_ERR, 'Security token does not match POST data.'); die(); } } /** * Adds a hidden input field to the given meta HTML table. * Should be used to add token at the end of table. * * @param htmlTable|htmlGroup|htmlResponsiveRow $container table */ function addSecurityTokenToMetaHTML(&$container) { $token = new htmlHiddenInput(getSecurityTokenName(), $_SESSION[getSecurityTokenName()]); if ($container instanceof htmlResponsiveRow) { $container->add($token, 12); return; } $container->addElement($token, true); } /** * Returns the name of the security token parameter. * * @return String name */ function getSecurityTokenName() { return 'sec_token'; } /** * Returns the value of the security token parameter. * * @return String value */ function getSecurityTokenValue() { return $_SESSION[getSecurityTokenName()]; } /** * Sets the X-Frame-Options and Content-Security-Policy header to prevent clickjacking. */ function setLAMHeaders() { if (!headers_sent()) { header('X-Frame-Options: sameorigin'); header('Content-Security-Policy: frame-ancestors \'self\''); } } /** * Encrypts a string * * @param string $data string to encrypt * @param string $prefix prefix for cookie names * @return object encrypted string */ function lamEncrypt($data, $prefix='') { // use OpenSSL if available if (function_exists('openssl_random_pseudo_bytes')) { // OpenSSL may have been enabled in a running session if (!isset($_COOKIE[$prefix . "IV"]) || ($_COOKIE[$prefix . "IV"] == '') || ($_COOKIE[$prefix . "IV"] == "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")) { return $data; } // read key and iv from cookie $iv = base64_decode($_COOKIE[$prefix . "IV"]); $key = base64_decode($_COOKIE[$prefix . "Key"]); // encrypt string return openssl_encrypt(base64_encode($data), lamEncryptionAlgo(), $key, 0, $iv); } // otherwise do not encrypt else { return $data; } } /** * Decrypts a string * * @param object $data string to decrypt * @param string $prefix prefix for cookie names * @return string decrypted string */ function lamDecrypt($data, $prefix='') { // use OpenSSL if available if (function_exists('openssl_random_pseudo_bytes')) { // OpenSSL may have been enabled in a running session if (!isset($_COOKIE[$prefix . "IV"]) || ($_COOKIE[$prefix . "IV"] == '') || ($_COOKIE[$prefix . "IV"] == "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")) { return $data; } // read key and iv from cookie $iv = base64_decode($_COOKIE[$prefix . "IV"]); $key = base64_decode($_COOKIE[$prefix . "Key"]); // decrypt string $ret = openssl_decrypt($data, lamEncryptionAlgo(), $key, 0, $iv); return base64_decode(str_replace(chr(00), "", $ret)); } // otherwise do not decrypt else { return $data; } } /** * Returns the encryption algorithm to use. * * @return string algorithm name */ function lamEncryptionAlgo() { $possibleAlgos = openssl_get_cipher_methods(); if (in_array('AES-256-CTR', $possibleAlgos)) { return 'AES-256-CTR'; } elseif (in_array('AES-256-CBC', $possibleAlgos)) { return 'AES-256-CBC'; } return 'AES256'; } ?>