92 lines
3.5 KiB
PHP
92 lines
3.5 KiB
PHP
<?php
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/**
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* Testet ob ein User eingeloggt ist und lädt die entsprechenden Privilegien
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*/
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function load_auth() {
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global $user, $privileges;
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$user = null;
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if (isset($_SESSION['uid'])) {
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$user = sql_select("SELECT * FROM `User` WHERE `UID`='" . sql_escape($_SESSION['uid']) . "' LIMIT 1");
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if (count($user) > 0) {
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// User ist eingeloggt, Datensatz zur Verfügung stellen und Timestamp updaten
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list($user) = $user;
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sql_query("UPDATE `User` SET " . "`lastLogIn` = '" . time() . "'" . " WHERE `UID` = '" . sql_escape($_SESSION['uid']) . "' LIMIT 1;");
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$privileges = privileges_for_user($user['UID']);
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return;
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}
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unset($_SESSION['uid']);
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}
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// guest privileges
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$privileges = privileges_for_group(- 1);
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}
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/**
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* generate a salt (random string) of arbitrary length suitable for the use with crypt()
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*/
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function generate_salt($length = 16) {
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$alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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$salt = "";
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for ($i = 0; $i < $length; $i ++) {
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$salt .= $alphabet[rand(0, strlen($alphabet) - 1)];
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}
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return $salt;
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}
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/**
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* set the password of a user
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*/
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function set_password($uid, $password) {
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global $crypt_alg;
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$result = sql_query("UPDATE `User` SET `Passwort` = '" . sql_escape(crypt($password, $crypt_alg . '$' . generate_salt(16) . '$')) . "', `password_recovery_token`=NULL WHERE `UID` = " . intval($uid) . " LIMIT 1");
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if ($result === false) {
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engelsystem_error('Unable to update password.');
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}
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return $result;
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}
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/**
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* verify a password given a precomputed salt.
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* if $uid is given and $salt is an old-style salt (plain md5), we convert it automatically
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*/
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function verify_password($password, $salt, $uid = false) {
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global $crypt_alg;
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$correct = false;
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if (substr($salt, 0, 1) == '$') { // new-style crypt()
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$correct = crypt($password, $salt) == $salt;
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} elseif (substr($salt, 0, 7) == '{crypt}') { // old-style crypt() with DES and static salt - not used anymore
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$correct = crypt($password, '77') == $salt;
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} elseif (strlen($salt) == 32) { // old-style md5 without salt - not used anymore
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$correct = md5($password) == $salt;
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}
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if ($correct && substr($salt, 0, strlen($crypt_alg)) != $crypt_alg && $uid) {
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// this password is stored in another format than we want it to be.
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// let's update it!
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// we duplicate the query from the above set_password() function to have the extra safety of checking the old hash
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sql_query("UPDATE `User` SET `Passwort` = '" . sql_escape(crypt($password, $crypt_alg . '$' . generate_salt() . '$')) . "' WHERE `UID` = " . intval($uid) . " AND `Passwort` = '" . sql_escape($salt) . "' LIMIT 1");
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}
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return $correct;
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}
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function privileges_for_user($user_id) {
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$privileges = [];
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$user_privs = sql_select("SELECT `Privileges`.`name` FROM `User` JOIN `UserGroups` ON (`User`.`UID` = `UserGroups`.`uid`) JOIN `GroupPrivileges` ON (`UserGroups`.`group_id` = `GroupPrivileges`.`group_id`) JOIN `Privileges` ON (`GroupPrivileges`.`privilege_id` = `Privileges`.`id`) WHERE `User`.`UID`='" . sql_escape($user_id) . "'");
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foreach ($user_privs as $user_priv) {
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$privileges[] = $user_priv['name'];
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}
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return $privileges;
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}
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function privileges_for_group($group_id) {
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$privileges = [];
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$groups_privs = sql_select("SELECT * FROM `GroupPrivileges` JOIN `Privileges` ON (`GroupPrivileges`.`privilege_id` = `Privileges`.`id`) WHERE `group_id`='" . sql_escape($group_id) . "'");
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foreach ($groups_privs as $guest_priv) {
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$privileges[] = $guest_priv['name'];
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}
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return $privileges;
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}
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?>
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