112 lines
3.1 KiB
PHP
112 lines
3.1 KiB
PHP
<?php
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use Engelsystem\Database\DB;
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use Engelsystem\Models\User\User;
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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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* @param int $length
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* @return string
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*/
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function generate_salt($length = 16)
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{
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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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* @param int $uid
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* @param string $password
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*/
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function set_password($uid, $password)
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{
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$user = User::find($uid);
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$user->password = crypt($password, config('crypt_alg') . '$' . generate_salt(16) . '$');
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$user->save();
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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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* @param string $password
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* @param string $salt
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* @param int $uid
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* @return bool
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*/
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function verify_password($password, $salt, $uid = null)
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{
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$crypt_alg = config('crypt_alg');
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$correct = false;
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if (substr($salt, 0, 1) == '$') {
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// new-style crypt()
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$correct = crypt($password, $salt) == $salt;
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} elseif (substr($salt, 0, 7) == '{crypt}') {
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// 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) {
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// 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)) != $crypt_alg && intval($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
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// the old hash
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$user = User::find($uid);
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if ($user->password == $salt) {
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$user->password = crypt($password, $crypt_alg . '$' . generate_salt() . '$');
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$user->save();
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}
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}
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return $correct;
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}
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/**
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* @param int $user_id
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* @return array
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*/
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function privileges_for_user($user_id)
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{
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$privileges = [];
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$user_privileges = DB::select('
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SELECT `Privileges`.`name`
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FROM `users`
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JOIN `UserGroups` ON (`users`.`id` = `UserGroups`.`uid`)
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JOIN `GroupPrivileges` ON (`UserGroups`.`group_id` = `GroupPrivileges`.`group_id`)
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JOIN `Privileges` ON (`GroupPrivileges`.`privilege_id` = `Privileges`.`id`)
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WHERE `users`.`id`=?
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', [$user_id]);
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foreach ($user_privileges as $user_privilege) {
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$privileges[] = $user_privilege['name'];
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}
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return $privileges;
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}
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/**
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* @param int $group_id
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* @return array
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*/
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function privileges_for_group($group_id)
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{
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$privileges = [];
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$groups_privileges = DB::select('
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SELECT `name`
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FROM `GroupPrivileges`
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JOIN `Privileges` ON (`GroupPrivileges`.`privilege_id` = `Privileges`.`id`)
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WHERE `group_id`=?
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', [$group_id]);
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foreach ($groups_privileges as $guest_privilege) {
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$privileges[] = $guest_privilege['name'];
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}
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return $privileges;
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}
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