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csrf: tighten csrf code paths a little

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o restructure session open/close for better visibility
o remove potentially insecure "try again" button
o remove override for switching csrf off (defer)
This commit is contained in:
Franco Fichtner 2016-05-03 17:01:15 +02:00
parent bef4c80115
commit d218b225cc
2 changed files with 11 additions and 70 deletions
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62
src/www/csrf/csrf-magic.php
View File

@ -15,16 +15,6 @@
// CONFIGURATION:
/**
* By default, when you include this file csrf-magic will automatically check
* and exit if the CSRF token is invalid. This will defer executing
* csrf_check() until you're ready. You can also pass false as a parameter to
* that function, in which case the function will not exit but instead return
* a boolean false if the CSRF check failed. This allows for tighter integration
* with your system.
*/
$GLOBALS['csrf']['defer'] = false;
/**
* This is the amount of seconds you wish to allow before any token becomes
* invalid; the default is two hours, which should be more than enough for
@ -117,12 +107,6 @@ $GLOBALS['csrf']['input-name'] = '__csrf_magic';
*/
$GLOBALS['csrf']['frame-breaker'] = true;
/**
* Whether or not CSRF Magic should be allowed to start a new session in order
* to determine the key.
*/
$GLOBALS['csrf']['auto-session'] = true;
/**
* Whether or not csrf-magic should produce XHTML style tags.
*/
@ -187,7 +171,6 @@ function csrf_check($fatal = true)
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
return true;
}
csrf_start();
$name = $GLOBALS['csrf']['input-name'];
$ok = false;
$tokens = '';
@ -232,7 +215,6 @@ function csrf_get_tokens()
} else {
$ip = '';
}
csrf_start();
// These are "strong" algorithms that don't require per se a secret
if (session_id()) {
@ -259,27 +241,6 @@ function csrf_get_tokens()
return 'invalid';
}
function csrf_flattenpost($data)
{
$ret = array();
foreach ($data as $n => $v) {
$ret = array_merge($ret, csrf_flattenpost2(1, $n, $v));
}
return $ret;
}
function csrf_flattenpost2($level, $key, $data)
{
if (!is_array($data)) {
return array($key => $data);
}
$ret = array();
foreach ($data as $n => $v) {
$nk = $level >= 1 ? $key."[$n]" : "[$n]";
$ret = array_merge($ret, csrf_flattenpost2($level+1, $nk, $v));
}
return $ret;
}
/**
* @param $tokens is safe for HTML consumption
*/
@ -287,18 +248,11 @@ function csrf_callback($tokens)
{
// (yes, $tokens is safe to echo without escaping)
header($_SERVER['SERVER_PROTOCOL'] . ' 403 Forbidden');
$data = '';
foreach (csrf_flattenpost($_POST) as $key => $value) {
if ($key == $GLOBALS['csrf']['input-name']) {
continue;
}
$data .= '<input type="hidden" name="'.htmlspecialchars($key).'" value="'.htmlspecialchars($value).'" />';
}
echo "<html><head><title>CSRF check failed</title></head>
<body>
<p>CSRF check failed. Your form session may have expired, or you may not have
cookies enabled.</p>
<form method='post' action=''>$data<input type='submit' value='Try again' /></form>
<p>Debug: $tokens</p></body></html>
";
}
@ -398,16 +352,6 @@ function csrf_conf($key, $val)
$GLOBALS['csrf'][$key] = $val;
}
/**
* Starts a session if we're allowed to.
*/
function csrf_start()
{
if ($GLOBALS['csrf']['auto-session'] && session_status() == PHP_SESSION_NONE) {
session_start();
}
}
/**
* Retrieves the secret, and generates one if necessary.
*/
@ -469,6 +413,4 @@ if ($GLOBALS['csrf']['rewrite']) {
ob_start('csrf_ob_handler');
}
// Perform check
if (!$GLOBALS['csrf']['defer']) {
csrf_check();
}
csrf_check();

19
src/www/guiconfig.inc
View File

@ -34,18 +34,17 @@ require_once("config.inc");
/* THIS MUST BE ABOVE ALL OTHER CODE */
if (empty($nocsrf)) {
function csrf_startup()
{
csrf_conf('rewrite-js', '/csrf/csrf-magic.js');
$timeout_minutes = isset($config['system']['webgui']['session_timeout']) ? $config['system']['webgui']['session_timeout'] : 240;
csrf_conf('expires', $timeout_minutes * 60);
}
require_once('csrf/csrf-magic.php');
function csrf_startup() {
global $config;
// make sure the session is closed after executing csrf-magic
if (session_status() != PHP_SESSION_NONE) {
session_write_close();
csrf_conf('rewrite-js', '/csrf/csrf-magic.js');
$timeout_minutes = isset($config['system']['webgui']['session_timeout']) ? $config['system']['webgui']['session_timeout'] : 240;
csrf_conf('expires', $timeout_minutes * 60);
}
session_start();
require_once('csrf/csrf-magic.php');
session_write_close();
}
function set_language()