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phorge-phorge/src/infrastructure/javelin/markup/markup.php
vrana 6bd8542abb Avoid sending CSRF token in GET and external forms
Summary:
Sending CSRF token in GET forms is dangerous because if there are external links
on the target page then the token could leak through Referer header.
The token is not required for anything because GET forms are used only to
display data, not to perform operations.
Sending CSRF tokens to external URLs leaks the token immediately.

Please note that <form action> defaults to GET.

PhabricatorUserOAuthSettingsPanelController suffered from this problem for both
reasons.

Test Plan: Save my settings (POST form).

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1558
2012-02-03 10:58:51 -08:00

73 lines
2 KiB
PHP

<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
function javelin_render_tag(
$tag,
array $attributes = array(),
$content = null) {
if (isset($attributes['sigil']) ||
isset($attributes['meta']) ||
isset($attributes['mustcapture'])) {
foreach ($attributes as $k => $v) {
switch ($k) {
case 'sigil':
$attributes['data-sigil'] = $v;
unset($attributes[$k]);
break;
case 'meta':
$response = CelerityAPI::getStaticResourceResponse();
$id = $response->addMetadata($v);
$attributes['data-meta'] = $id;
unset($attributes[$k]);
break;
case 'mustcapture':
$attributes['data-mustcapture'] = '1';
unset($attributes[$k]);
break;
}
}
}
return phutil_render_tag($tag, $attributes, $content);
}
function phabricator_render_form(PhabricatorUser $user, $attributes, $content) {
if (strcasecmp(idx($attributes, 'method'), 'POST') == 0 &&
!preg_match('#^(https?:|//)#', idx($attributes, 'action'))) {
$content =
phutil_render_tag(
'input',
array(
'type' => 'hidden',
'name' => AphrontRequest::getCSRFTokenName(),
'value' => $user->getCSRFToken(),
)).
phutil_render_tag(
'input',
array(
'type' => 'hidden',
'name' => '__form__',
'value' => true,
)).
$content;
}
return javelin_render_tag('form', $attributes, $content);
}