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Implement token system to fix CSRF vulnerabilities

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Specially crafted pages can force authenticated users to unknowingly perform
actions on the AUR website despite being on an attacker's website. This
cross-site request forgery (CSRF) vulnerability applies to all POST data on
the AUR.

Implement a token system using a double submit cookie. Have a hidden form
value on every page containing POST forms. Use the newly added check_token() to
verify the token sent via POST matches the "AURSID" cookie value. Random
nature of the token limits potential for CSRF.

Signed-off-by: canyonknight <canyonknight@gmail.com>
Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>
This commit is contained in:
canyonknight 2012-06-23 14:40:11 -04:00 • committed by Lukas Fleischer
parent bfb25807c4
commit 2c93f0a98f
13 changed files with 82 additions and 46 deletions
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14
web/html/pkgsubmit.php
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@ -27,9 +27,16 @@ if ($uid):
if (isset($_REQUEST['pkgsubmit'])) {
# Make sure authenticated user submitted the package themselves
if (!check_token()) {
$error = __("Invalid token for user action.");
}
# Before processing, make sure we even have a file
if ($_FILES['pfile']['size'] == 0){
$error = __("Error - No file uploaded");
if (!$error) {
if ($_FILES['pfile']['size'] == 0){
$error = __("Error - No file uploaded");
}
}
# Check whether the file is gzip'ed
@ -448,7 +455,8 @@ html_header("Submit");
?>
<form action='pkgsubmit.php' method='post' enctype='multipart/form-data'>
<div> <input type='hidden' name='pkgsubmit' value='1' /> </div>
<div> <input type='hidden' name='pkgsubmit' value='1' />
<input type='hidden' name='token' value='<?php print htmlspecialchars($_COOKIE['AURSID']) ?>' /> </div>
<table border='0' cellspacing='5'>
<tr>
<td class='f4' align='right'><?php print __("Package Category"); ?>:</td>