blob: 8c2214daa4c0976678dfab0f33ba95754e1b2631 [file] [log] [blame]
<?php
/*
* hores
* Copyright (c) 2023 Adrià Vilanova Martínez
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this program.
* If not, see http://www.gnu.org/licenses/.
*/
class security {
const HYPERADMIN = 0;
const ADMIN = 2;
/*const SYSTEM_REVIEWER = 5;
const LOG_REVIEWER = 7;*/
const WORKER = 10;
const UNKNOWN = 1000;
const METHOD_UNSPECIFICED = -1;
const METHOD_REDIRECT = 0;
const METHOD_NOTFOUND = 1;
const PARAM_ISSET = 1;
const PARAM_NEMPTY = 2;
const PARAM_ISEMAIL = 4;
const PARAM_ISDATE = 8;
const PARAM_ISINT = 16;
const PARAM_ISTIME = 32;
const PARAM_ISARRAY = 64;
const PARAM_ISEMAILOREMPTY = 128;
const SIGNIN_STATE_SIGNED_IN = 0;
const SIGNIN_STATE_NEEDS_SECOND_FACTOR = 1;
const SIGNIN_STATE_SIGNED_OUT = 2;
const SIGNIN_STATE_THROTTLED = 3;
public static $types = [
10 => "Trabajador",
/*7 => "Revisor de logs",
5 => "Revisor del sistema",*/
2 => "Administrador",
0 => "Hiperadministrador"
];
public static $automatedChecks = [self::PARAM_ISSET, self::PARAM_NEMPTY, self::PARAM_ISEMAIL, self::PARAM_ISDATE, self::PARAM_ISINT, self::PARAM_ISTIME, self::PARAM_ISARRAY, self::PARAM_ISEMAILOREMPTY];
public static $passwordHelperText = "La contraseña debe tener como mínimo 8 caracteres y una letra mayúscula.";
public static function go($page) {
global $conf;
if ($conf["superdebug"]) {
echo "Redirects are not enabled. We would like to redirect you here: <a href='".self::htmlsafe($page)."'>".self::htmlsafe($page)."</a>";
} else {
header("Location: ".$page);
}
exit();
}
public static function goHome() {
self::go("index.php");
}
public static function notFound() {
header('HTTP/1.0 404 Not Found');
exit();
}
public static function isSignedIn() {
global $_SESSION;
return isset($_SESSION["id"]);
}
public static function check() {
if (!self::isSignedIn()) {
self::goHome();
}
}
public static function userType() {
global $_SESSION, $con;
if (!isset($_SESSION["id"])) {
return self::UNKNOWN;
}
$query = mysqli_query($con, "SELECT type FROM people WHERE id = ".(int)$_SESSION["id"]);
if (!mysqli_num_rows($query)) {
return self::UNKNOWN;
}
$row = mysqli_fetch_assoc($query);
return $row["type"];
}
public static function isAllowed($type) {
$userType = (self::isSignedIn() ? self::userType() : self::UNKNOWN);
return $userType <= $type;
}
public static function denyUseMethod($method = self::METHOD_REDIRECT) {
if ($method === self::METHOD_NOTFOUND) {
self::notFound();
} else { // self::METHOD_REDIRECT or anything else
self::goHome();
}
}
public static function checkType($type, $method = self::METHOD_REDIRECT) {
if (!self::isAllowed($type)) {
self::denyUseMethod($method);
}
}
public static function checkWorkerUIEnabled() {
global $conf;
if (self::userType() >= self::WORKER && !$conf["enableWorkerUI"]) {
self::go("index.php?msg=unsupported");
}
}
// Code from https://timoh6.github.io/2015/05/07/Rate-limiting-web-application-login-attempts.html
private static function getIpAddresses() {
$ips = [];
$ips["remoteIp"] = inet_pton($_SERVER['REMOTE_ADDR']); // inet_pton can handle both IPv4 and IPv6 addresses, treat IPv6 addresses as /64 or /56 blocks.
$ips["remoteIpBlock"] = long2ip(ip2long($_SERVER['REMOTE_ADDR']) & 0xFFFFFF00); // Something like this to turn the last octet of IPv4 address into a 0.
return $ips;
}
public static function recordLoginAttempt($username) {
global $con;
$susername = db::sanitize($username);
$ips = self::getIpAddresses();
$sremoteIp = db::sanitize($ips["remoteIp"]);
$sremoteIpBlock = db::sanitize($ips["remoteIpBlock"]);
return mysqli_query($con, "INSERT INTO signinattempts (username, remoteip, remoteipblock, signinattempttime) VALUES ('$susername', '$sremoteIp', '$sremoteIpBlock', NOW())");
}
public static function getRateLimitingCounts($username) {
global $con, $conf;
$susername = db::sanitize($username);
$ips = self::getIpAddresses();
$sremoteIp = db::sanitize($ips["remoteIp"]);
$sremoteIpBlock = db::sanitize($ips["remoteIpBlock"]);
$query = mysqli_query($con, "SELECT
COUNT(*) AS global_attempt_count,
IFNULL(SUM(CASE WHEN remoteip = '$sremoteIp' THEN 1 ELSE 0 END), 0) AS ip_attempt_count,
IFNULL(SUM(CASE WHEN (remoteipblock = '$sremoteIpBlock') THEN 1 ELSE 0 END), 0) AS ip_block_attempt_count,
(SELECT COUNT(DISTINCT remoteipblock) FROM signinattempts WHERE username = '$susername' AND signinattempttime >= (NOW() - INTERVAL 10 SECOND )) AS ip_blocks_per_username_attempt_count,
(SELECT COUNT(*) FROM signinattempts WHERE username = '$susername' AND signinattempttime >= (NOW() - INTERVAL 10 SECOND )) AS username_attempt_count
FROM signinattempts
WHERE signinattempttime >= (NOW() - INTERVAL 10 second)");
if ($query === false) return false;
return mysqli_fetch_assoc($query);
}
public static function isSignInThrottled($username) {
global $conf;
$count = self::getRateLimitingCounts($username);
if ($count["global_attempt_count"] >= $conf["signinThrottling"]["attemptCountLimit"]["global"] ||
$count["ip_attempt_count"] >= $conf["signinThrottling"]["attemptCountLimit"]["ip"] ||
$count["ip_block_attempt_count"] >= $conf["signinThrottling"]["attemptCountLimit"]["ipBlock"] ||
$count["ip_blocks_per_username_attempt_count"] >= $conf["signinThrottling"]["attemptCountLimit"]["ipBlocksPerUsername"] ||
$count["username_attempt_count"] >= $conf["signinThrottling"]["attemptCountLimit"]["username"]) {
return true;
}
if (!self::recordLoginAttempt($username)) {
echo "There was an unexpected error, so you could not be authenticated. Please contact me@avm99963.com and let them know of the error. (2)";
exit();
}
return false;
}
public static function isUserPassword($username, $password) {
global $con, $_SESSION;
$susername = db::sanitize($username);
$query = mysqli_query($con, "SELECT id, password FROM people WHERE ".($username === false ? "id = ".(int)$_SESSION["id"] : "username = '".$susername."'"));
if (!mysqli_num_rows($query)) {
return false;
}
$row = mysqli_fetch_assoc($query);
if (!password_verify($password, $row["password"])) {
return false;
}
return $row["id"];
}
public static function signIn($username, $password) {
global $_SESSION;
if (self::isSignInThrottled($username)) return self::SIGNIN_STATE_THROTTLED;
$id = self::isUserPassword($username, $password);
if ($id !== false) {
if (secondFactor::isEnabled($id)) {
$_SESSION["firstfactorid"] = $id;
return self::SIGNIN_STATE_NEEDS_SECOND_FACTOR;
} else {
$_SESSION["id"] = $id;
return self::SIGNIN_STATE_SIGNED_IN;
}
}
return self::SIGNIN_STATE_SIGNED_OUT;
}
public static function redirectAfterSignIn() {
global $conf;
if (self::isAllowed(self::ADMIN)) {
self::changeActiveView(visual::VIEW_ADMIN);
self::go("home.php");
} else {
self::changeActiveView(visual::VIEW_WORKER);
self::go(($conf["enableWorkerUI"] ? "workerhome.php" : "index.php?msg=unsupported"));
}
}
public static function logout() {
global $_SESSION;
session_destroy();
}
public static function htmlsafe($string) {
if ($string === null) return '';
return htmlspecialchars((string)$string);
}
private static function failedCheckParams($parameter, $method, $check) {
global $conf;
if ($conf["superdebug"]) {
echo "Failed check ".(int)$check." using parameter '".self::htmlsafe($parameter)."' with method ".self::htmlsafe($method).".<br>";
}
}
public static function checkParam($param, $check) {
if ($check == self::PARAM_NEMPTY && empty($param)) {
return false;
}
if ($check == self::PARAM_ISEMAIL && filter_var($param, FILTER_VALIDATE_EMAIL) === false) {
return false;
}
if ($check == self::PARAM_ISDATE && preg_match("/^[0-9]+-[0-9]+-[0-9]+$/", $param) !== 1) {
return false;
}
if ($check == self::PARAM_ISINT && filter_var($param, FILTER_VALIDATE_INT) === false) {
return false;
}
if ($check == self::PARAM_ISTIME) {
if (preg_match("/^[0-9]+:[0-9]+$/", $param) !== 1) return false;
$time = explode(":", $param);
if ((int)$time[0] >= 24 || (int)$time[1] >= 60) return false;
}
if ($check == self::PARAM_ISARRAY) {
// Check whether the parameter is an array
if (is_array($param) === false) return false;
// Check that it is not a multidimensional array (we don't want that for any parameter!)
foreach ($param as &$el) {
if (is_array($el)) return false;
}
}
if ($check == self::PARAM_ISEMAILOREMPTY && $param !== "" && filter_var($param, FILTER_VALIDATE_EMAIL) === false) {
return false;
}
return true;
}
public static function checkParams($method, $parameters, $forceDisableDebug = false) {
global $_POST, $_GET;
if (!in_array($method, ["GET", "POST"])) {
return false;
}
foreach ($parameters as $p) {
if (!$p[1]) {
continue;
}
if (($method == "POST" && !isset($_POST[$p[0]])) || ($method == "GET" && !isset($_GET[$p[0]]))) {
if (!$forceDisableDebug) self::failedCheckParams($p[0], $method, self::PARAM_ISSET);
return false;
}
$value = ($method == "POST" ? $_POST[$p[0]] : $_GET[$p[0]]);
foreach (self::$automatedChecks as $check) {
if (($p[1] & $check) && !self::checkParam($value, $check)) {
if (!$forceDisableDebug) self::failedCheckParams($p[0], $method, $check);
return false;
}
}
}
return true;
}
public static function existsType($type) {
$types = array_keys(self::$types);
return in_array($type, $types);
}
public static function getActiveView() {
global $_SESSION;
if (!self::isAllowed(self::ADMIN)) {
return visual::VIEW_WORKER;
}
return (!isset($_SESSION["activeView"]) ? visual::VIEW_ADMIN : $_SESSION["activeView"]);
}
public static function isAdminView() {
return (self::getActiveView() === visual::VIEW_ADMIN);
}
public static function changeActiveView($view) {
$_SESSION["activeView"] = $view;
}
public static function passwordIsGoodEnough($password) {
return (strlen($password) >= 8 && preg_match('/[A-Z]/', $password));
}
public static function cleanSignInAttempts($retentionDays = "DEFAULT") {
global $con, $conf;
if ($retentionDays === "DEFAULT") $retentionDays = $conf["signinThrottling"]["retentionDays"];
$sretentionDays = (int)$retentionDays;
if ($retentionDays < 0) return false;
return mysqli_query($con, "DELETE FROM signinattempts WHERE signinattempttime < (NOW() - INTERVAL $sretentionDays DAY)");
}
}