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Code Issues Releases Wiki Activity

Merge pull request #15 from jrmhaig/csrf

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Guard against CSRF
This commit is contained in:
Bill Zimmerman 2016-06-27 23:43:53 +02:00 committed by GitHub
commit 14f9fd27e3
3 changed files with 54 additions and 19 deletions
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43
includes/admin.php
View File

@ -11,28 +11,32 @@ function Status($message, $level='success', $dismissable=true) {
}
function DisplayAuthConfig($username, $password){
$status = '';
if (isset($_POST['UpdateAdminPassword'])) {
if (password_verify($_POST['oldpass'], $password)) {
$new_username=trim($_POST['username']);
if ($_POST['newpass'] != $_POST['newpassagain']) {
$status = Status('New passwords do not match', 'danger');
} else if ($new_username == '') {
$status = Status('Username must not be empty', 'danger');
} else {
if ($auth_file = fopen(RASPI_ADMIN_DETAILS, 'w')) {
fwrite($auth_file, $new_username.PHP_EOL);
fwrite($auth_file, password_hash($_POST['newpass'], PASSWORD_BCRYPT).PHP_EOL);
fclose($auth_file);
$username = $new_username;
$status = Status('Admin password updated');
$status = '';
if (isset($_POST['UpdateAdminPassword'])) {
if (CSRFValidate()) {
if (password_verify($_POST['oldpass'], $password)) {
$new_username=trim($_POST['username']);
if ($_POST['newpass'] != $_POST['newpassagain']) {
$status = Status('New passwords do not match', 'danger');
} else if ($new_username == '') {
$status = Status('Username must not be empty', 'danger');
} else {
$status = Status('Failed to update admin password', 'danger');
if ($auth_file = fopen(RASPI_ADMIN_DETAILS, 'w')) {
fwrite($auth_file, $new_username.PHP_EOL);
fwrite($auth_file, password_hash($_POST['newpass'], PASSWORD_BCRYPT).PHP_EOL);
fclose($auth_file);
$username = $new_username;
$status = Status('Admin password updated');
} else {
$status = Status('Failed to update admin password', 'danger');
}
}
} else {
$status = Status('Old password does not match', 'danger');
}
} else {
$status = Status('Old password does not match', 'danger');
}
} else {
error_log('CSRF violation');
}
}
?>
<div class="row">
@ -42,6 +46,7 @@ function DisplayAuthConfig($username, $password){
<div class="panel-body">
<p><?php echo $status; ?></p>
<form role="form" action="/?page=auth_conf" method="POST">
<?php CSRFToken() ?>
<div class="row">
<div class="form-group col-md-4">
<label for="username">Username</label>

20
includes/functions.php
View File

@ -1,5 +1,25 @@
<?php
/**
*
* Add CSRF Token to form
*
*/
function CSRFToken() {
?>
<input type="hidden" name="csrf_token" value="<?php echo $_SESSION['csrf_token']; ?>" />
<?php
}
/**
*
* Validate CSRF Token
*
*/
function CSRFValidate() {
return hash_equals($_POST['csrf_token'], $_SESSION['csrf_token']);
}
/**
*
* @param string $input

10
index.php
View File

@ -44,6 +44,16 @@ include_once( 'includes/functions.php' );
$output = $return = 0;
$page = $_GET['page'];
session_start();
if (empty($_SESSION['csrf_token'])) {
if (function_exists('mcrypt_create_iv')) {
$_SESSION['csrf_token'] = bin2hex(mcrypt_create_iv(32, MCRYPT_DEV_URANDOM));
} else {
$_SESSION['csrf_token'] = bin2hex(openssl_random_pseudo_bytes(32));
}
}
$csrf_token = $_SESSION['csrf_token'];
?>
<!DOCTYPE html>