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574
system/Security/Security.php
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574
system/Security/Security.php
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@@ -0,0 +1,574 @@
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<?php
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/**
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* This file is part of CodeIgniter 4 framework.
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*
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* (c) CodeIgniter Foundation <admin@codeigniter.com>
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*
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* For the full copyright and license information, please view
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* the LICENSE file that was distributed with this source code.
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*/
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namespace CodeIgniter\Security;
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use CodeIgniter\Cookie\Cookie;
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use CodeIgniter\HTTP\RequestInterface;
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use CodeIgniter\HTTP\Response;
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use CodeIgniter\Security\Exceptions\SecurityException;
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use CodeIgniter\Session\Session;
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use Config\App;
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use Config\Cookie as CookieConfig;
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use Config\Security as SecurityConfig;
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use Config\Services;
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use LogicException;
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/**
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* Class Security
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*
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* Provides methods that help protect your site against
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* Cross-Site Request Forgery attacks.
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*/
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class Security implements SecurityInterface
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{
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public const CSRF_PROTECTION_COOKIE = 'cookie';
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public const CSRF_PROTECTION_SESSION = 'session';
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protected const CSRF_HASH_BYTES = 16;
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/**
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* CSRF Protection Method
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*
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* Protection Method for Cross Site Request Forgery protection.
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*
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* @var string 'cookie' or 'session'
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*/
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protected $csrfProtection = self::CSRF_PROTECTION_COOKIE;
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/**
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* CSRF Token Randomization
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*
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* @var bool
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*/
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protected $tokenRandomize = false;
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/**
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* CSRF Hash
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*
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* Random hash for Cross Site Request Forgery protection.
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*
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* @var string|null
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*/
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protected $hash;
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/**
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* CSRF Token Name
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*
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* Token name for Cross Site Request Forgery protection.
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*
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* @var string
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*/
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protected $tokenName = 'csrf_token_name';
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/**
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* CSRF Header Name
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*
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* Header name for Cross Site Request Forgery protection.
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*
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* @var string
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*/
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protected $headerName = 'X-CSRF-TOKEN';
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/**
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* The CSRF Cookie instance.
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*
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* @var Cookie
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*/
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protected $cookie;
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/**
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* CSRF Cookie Name
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*
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* Cookie name for Cross Site Request Forgery protection.
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*
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* @var string
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*/
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protected $cookieName = 'csrf_cookie_name';
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/**
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* CSRF Expires
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*
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* Expiration time for Cross Site Request Forgery protection cookie.
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*
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* Defaults to two hours (in seconds).
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*
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* @var int
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*/
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protected $expires = 7200;
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/**
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* CSRF Regenerate
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*
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* Regenerate CSRF Token on every request.
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*
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* @var bool
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*/
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protected $regenerate = true;
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/**
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* CSRF Redirect
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*
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* Redirect to previous page with error on failure.
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*
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* @var bool
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*/
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protected $redirect = true;
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/**
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* CSRF SameSite
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*
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* Setting for CSRF SameSite cookie token.
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*
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* Allowed values are: None - Lax - Strict - ''.
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*
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* Defaults to `Lax` as recommended in this link:
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*
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* @see https://portswigger.net/web-security/csrf/samesite-cookies
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*
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* @var string
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*
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* @deprecated
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*/
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protected $samesite = Cookie::SAMESITE_LAX;
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/**
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* @var RequestInterface
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*/
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private $request;
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/**
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* CSRF Cookie Name without Prefix
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*
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* @var string
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*/
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private $rawCookieName;
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/**
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* Session instance.
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*
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* @var Session
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*/
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private $session;
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/**
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* Constructor.
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*
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* Stores our configuration and fires off the init() method to setup
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* initial state.
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*/
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public function __construct(App $config)
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{
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/** @var SecurityConfig|null $security */
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$security = config('Security');
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// Store CSRF-related configurations
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if ($security instanceof SecurityConfig) {
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$this->csrfProtection = $security->csrfProtection ?? $this->csrfProtection;
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$this->tokenName = $security->tokenName ?? $this->tokenName;
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$this->headerName = $security->headerName ?? $this->headerName;
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$this->regenerate = $security->regenerate ?? $this->regenerate;
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$this->rawCookieName = $security->cookieName ?? $this->rawCookieName;
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$this->expires = $security->expires ?? $this->expires;
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$this->tokenRandomize = $security->tokenRandomize ?? $this->tokenRandomize;
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} else {
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// `Config/Security.php` is absence
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$this->tokenName = $config->CSRFTokenName ?? $this->tokenName;
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$this->headerName = $config->CSRFHeaderName ?? $this->headerName;
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$this->regenerate = $config->CSRFRegenerate ?? $this->regenerate;
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$this->rawCookieName = $config->CSRFCookieName ?? $this->rawCookieName;
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$this->expires = $config->CSRFExpire ?? $this->expires;
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}
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if ($this->isCSRFCookie()) {
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$this->configureCookie($config);
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} else {
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// Session based CSRF protection
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$this->configureSession();
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}
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$this->request = Services::request();
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$this->generateHash();
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}
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private function isCSRFCookie(): bool
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{
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return $this->csrfProtection === self::CSRF_PROTECTION_COOKIE;
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}
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private function configureSession(): void
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{
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$this->session = Services::session();
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}
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private function configureCookie(App $config): void
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{
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/** @var CookieConfig|null $cookie */
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$cookie = config('Cookie');
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if ($cookie instanceof CookieConfig) {
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$cookiePrefix = $cookie->prefix;
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$this->cookieName = $cookiePrefix . $this->rawCookieName;
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Cookie::setDefaults($cookie);
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} else {
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// `Config/Cookie.php` is absence
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$cookiePrefix = $config->cookiePrefix;
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$this->cookieName = $cookiePrefix . $this->rawCookieName;
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}
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}
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/**
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* CSRF Verify
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*
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* @throws SecurityException
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*
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* @return $this|false
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*
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* @deprecated Use `CodeIgniter\Security\Security::verify()` instead of using this method.
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*
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* @codeCoverageIgnore
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*/
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public function CSRFVerify(RequestInterface $request)
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{
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return $this->verify($request);
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}
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/**
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* Returns the CSRF Hash.
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*
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* @deprecated Use `CodeIgniter\Security\Security::getHash()` instead of using this method.
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*
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* @codeCoverageIgnore
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*/
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public function getCSRFHash(): ?string
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{
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return $this->getHash();
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}
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/**
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* Returns the CSRF Token Name.
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*
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* @deprecated Use `CodeIgniter\Security\Security::getTokenName()` instead of using this method.
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*
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* @codeCoverageIgnore
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*/
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public function getCSRFTokenName(): string
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{
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return $this->getTokenName();
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}
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/**
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* CSRF Verify
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*
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* @throws SecurityException
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*
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* @return $this
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*/
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public function verify(RequestInterface $request)
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{
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// Protects POST, PUT, DELETE, PATCH
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$method = strtoupper($request->getMethod());
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$methodsToProtect = ['POST', 'PUT', 'DELETE', 'PATCH'];
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if (! in_array($method, $methodsToProtect, true)) {
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return $this;
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}
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$token = $this->tokenRandomize ? $this->derandomize($this->getPostedToken($request))
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: $this->getPostedToken($request);
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// Do the tokens match?
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if (! isset($token, $this->hash) || ! hash_equals($this->hash, $token)) {
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throw SecurityException::forDisallowedAction();
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}
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$json = json_decode($request->getBody() ?? '');
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if (isset($_POST[$this->tokenName])) {
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// We kill this since we're done and we don't want to pollute the POST array.
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unset($_POST[$this->tokenName]);
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$request->setGlobal('post', $_POST);
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} elseif (isset($json->{$this->tokenName})) {
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// We kill this since we're done and we don't want to pollute the JSON data.
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unset($json->{$this->tokenName});
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$request->setBody(json_encode($json));
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}
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if ($this->regenerate) {
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$this->hash = null;
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if ($this->isCSRFCookie()) {
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unset($_COOKIE[$this->cookieName]);
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} else {
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// Session based CSRF protection
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$this->session->remove($this->tokenName);
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}
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}
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$this->generateHash();
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log_message('info', 'CSRF token verified.');
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return $this;
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}
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private function getPostedToken(RequestInterface $request): ?string
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{
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// Does the token exist in POST, HEADER or optionally php:://input - json data.
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if ($request->hasHeader($this->headerName) && ! empty($request->header($this->headerName)->getValue())) {
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$tokenName = $request->header($this->headerName)->getValue();
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} else {
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$body = (string) $request->getBody();
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$json = json_decode($body);
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if ($body !== '' && ! empty($json) && json_last_error() === JSON_ERROR_NONE) {
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$tokenName = $json->{$this->tokenName} ?? null;
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} else {
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$tokenName = null;
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}
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}
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return $request->getPost($this->tokenName) ?? $tokenName;
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}
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/**
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* Returns the CSRF Hash.
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*/
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public function getHash(): ?string
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{
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return $this->tokenRandomize ? $this->randomize($this->hash) : $this->hash;
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}
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/**
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* Randomize hash to avoid BREACH attacks.
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*/
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protected function randomize(string $hash): string
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{
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$keyBinary = random_bytes(static::CSRF_HASH_BYTES);
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$hashBinary = hex2bin($hash);
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if ($hashBinary === false) {
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throw new LogicException('$hash is invalid: ' . $hash);
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}
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return bin2hex(($hashBinary ^ $keyBinary) . $keyBinary);
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}
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/**
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* Derandomize the token.
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*/
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protected function derandomize(string $token): string
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{
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$key = substr($token, -static::CSRF_HASH_BYTES * 2);
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$value = substr($token, 0, static::CSRF_HASH_BYTES * 2);
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return bin2hex(hex2bin($value) ^ hex2bin($key));
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}
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/**
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* Returns the CSRF Token Name.
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*/
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public function getTokenName(): string
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{
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return $this->tokenName;
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}
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/**
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* Returns the CSRF Header Name.
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*/
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public function getHeaderName(): string
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{
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return $this->headerName;
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}
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/**
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* Returns the CSRF Cookie Name.
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*/
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public function getCookieName(): string
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{
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return $this->cookieName;
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}
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/**
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* Check if CSRF cookie is expired.
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*
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* @deprecated
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*
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* @codeCoverageIgnore
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*/
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public function isExpired(): bool
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{
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return $this->cookie->isExpired();
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}
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/**
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* Check if request should be redirect on failure.
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*/
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public function shouldRedirect(): bool
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{
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return $this->redirect;
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}
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/**
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* Sanitize Filename
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*
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* Tries to sanitize filenames in order to prevent directory traversal attempts
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* and other security threats, which is particularly useful for files that
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* were supplied via user input.
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*
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* If it is acceptable for the user input to include relative paths,
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* e.g. file/in/some/approved/folder.txt, you can set the second optional
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* parameter, $relative_path to TRUE.
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*
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* @param string $str Input file name
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* @param bool $relativePath Whether to preserve paths
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*/
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public function sanitizeFilename(string $str, bool $relativePath = false): string
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{
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// List of sanitize filename strings
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$bad = [
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'../',
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'<!--',
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'-->',
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'<',
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'>',
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||||
"'",
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'"',
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'&',
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||||
'$',
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||||
'#',
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||||
'{',
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'}',
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||||
'[',
|
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']',
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||||
'=',
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||||
';',
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||||
'?',
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'%20',
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'%22',
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||||
'%3c',
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||||
'%253c',
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||||
'%3e',
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||||
'%0e',
|
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'%28',
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'%29',
|
||||
'%2528',
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'%26',
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||||
'%24',
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||||
'%3f',
|
||||
'%3b',
|
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'%3d',
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||||
];
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|
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if (! $relativePath) {
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$bad[] = './';
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$bad[] = '/';
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||||
}
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$str = remove_invisible_characters($str, false);
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do {
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||||
$old = $str;
|
||||
$str = str_replace($bad, '', $str);
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||||
} while ($old !== $str);
|
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return stripslashes($str);
|
||||
}
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||||
|
||||
/**
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||||
* Generates the CSRF Hash.
|
||||
*/
|
||||
protected function generateHash(): string
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{
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if ($this->hash === null) {
|
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// If the cookie exists we will use its value.
|
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// We don't necessarily want to regenerate it with
|
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// each page load since a page could contain embedded
|
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// sub-pages causing this feature to fail
|
||||
if ($this->isCSRFCookie()) {
|
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if ($this->isHashInCookie()) {
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return $this->hash = $_COOKIE[$this->cookieName];
|
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}
|
||||
} elseif ($this->session->has($this->tokenName)) {
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||||
// Session based CSRF protection
|
||||
return $this->hash = $this->session->get($this->tokenName);
|
||||
}
|
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|
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$this->hash = bin2hex(random_bytes(static::CSRF_HASH_BYTES));
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||||
|
||||
if ($this->isCSRFCookie()) {
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$this->saveHashInCookie();
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} else {
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// Session based CSRF protection
|
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$this->saveHashInSession();
|
||||
}
|
||||
}
|
||||
|
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return $this->hash;
|
||||
}
|
||||
|
||||
private function isHashInCookie(): bool
|
||||
{
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||||
return isset($_COOKIE[$this->cookieName])
|
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&& is_string($_COOKIE[$this->cookieName])
|
||||
&& preg_match('#^[0-9a-f]{32}$#iS', $_COOKIE[$this->cookieName]) === 1;
|
||||
}
|
||||
|
||||
private function saveHashInCookie(): void
|
||||
{
|
||||
$this->cookie = new Cookie(
|
||||
$this->rawCookieName,
|
||||
$this->hash,
|
||||
[
|
||||
'expires' => $this->expires === 0 ? 0 : time() + $this->expires,
|
||||
]
|
||||
);
|
||||
|
||||
/** @var Response $response */
|
||||
$response = Services::response();
|
||||
$response->setCookie($this->cookie);
|
||||
}
|
||||
|
||||
/**
|
||||
* CSRF Send Cookie
|
||||
*
|
||||
* @return false|Security
|
||||
*
|
||||
* @deprecated Set cookies to Response object instead.
|
||||
*/
|
||||
protected function sendCookie(RequestInterface $request)
|
||||
{
|
||||
if ($this->cookie->isSecure() && ! $request->isSecure()) {
|
||||
return false;
|
||||
}
|
||||
|
||||
$this->doSendCookie();
|
||||
log_message('info', 'CSRF cookie sent.');
|
||||
|
||||
return $this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Actual dispatching of cookies.
|
||||
* Extracted for this to be unit tested.
|
||||
*
|
||||
* @codeCoverageIgnore
|
||||
*
|
||||
* @deprecated Set cookies to Response object instead.
|
||||
*/
|
||||
protected function doSendCookie(): void
|
||||
{
|
||||
cookies([$this->cookie], false)->dispatch();
|
||||
}
|
||||
|
||||
private function saveHashInSession(): void
|
||||
{
|
||||
$this->session->set($this->tokenName, $this->hash);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user