Simple protection middleware against CSRF attacks for Slim PHP framework.
- Really protect your app from csr forgery ;)
- Helpers for forms and jQuery
- Versions with and without sessions usage
Version with Sessions (must be enabled)
session_start();
$app = new Slim(); // init app
$app->add( new SlimCSRFProtection() );
Also, you can pass custom function as callback:
function show_message() { echo "verification not passed" }
$app->add( new SlimCSRFProtection('show_message') );
Note, if you use SlimCSRFProtectionNoSession instead of SlimCSRFProtection, you need to pass in constructor as first argument some secret string, which will be used for generating csrf token - it's required. And, optionally, constructor takes function which will be executed if submitted token is not valid.
$app->add( new SlimCSRFProtectionNoSession("It is my secret string!") );
With function:
function show_message() { echo "verification not passed" }
$app->add( new SlimCSRFProtectionNoSession("It is my secret string!", 'show_message') );
SlimCSRFProtectionNoSession generates token, related to your secret string, $_SERVER['REMOTE_ADDR'] and $_SERVER['USER_AGENT'], therefore it is not full protection - users from same subnet takes same token. If it is possible, use SlimCSRFProtection instead of SlimCSRFProtectionNoSession
By default the middleware appends to view three variables:
$csrf_token - random secret token
$csrf_protection_input - <input> for usage in forms (<input type="hidden" value="<?= $csrf_token ?>">)
$csrf_protection_jquery - jquery code, which add 'X_CSRF_TOKEN' header to each jQuery.ajax post request
You can use those in HTML like so
<form action="/login" method="POST">
<?= $csrf_protection_input ?>
<input name="login">
<input name="passwd">
<input type="submit" value="Submit">
</form>
...
<head>
<title>Example</title>
....
<?= $csrf_protection_jquery ?>
</head>
...
static::create_token() - returns csrf token
$this->is_token_valid($token) - returns true, if token is valid
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