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Implement token system to fix CSRF vulnerabilities

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

2
web/html/account.php
View file

@ -88,11 +88,13 @@ if (isset($_COOKIE["AURSID"])) {
} elseif ($action == "UpdateAccount") {
# user is submitting their modifications to an existing account
#
if (check_token()) {
process_account_form($atype, "edit", "UpdateAccount",
in_request("U"), in_request("T"), in_request("S"),
in_request("E"), in_request("P"), in_request("C"),
in_request("R"), in_request("L"), in_request("I"),
in_request("ID"));
}
} else {

7
web/html/addvote.php
View file

@ -16,7 +16,11 @@ if (isset($_COOKIE["AURSID"])) {
if ($atype == "Trusted User" OR $atype == "Developer") {
$dbh = db_connect();
if (!empty($_POST['addVote'])) {
if (!empty($_POST['addVote']) && !check_token()) {
$error = __("Invalid token for user action.");
}
if (!empty($_POST['addVote']) && check_token()) {
$error = "";
if (!empty($_POST['user'])) {
@ -99,6 +103,7 @@ if ($atype == "Trusted User" OR $atype == "Developer") {
<b><?php print __('Proposal') ?></b><br />
<textarea name='agenda' rows='25' cols='80'><?php if (!empty($_POST['agenda'])) { print htmlentities($_POST['agenda']); } ?></textarea><br />
<input type='hidden' name='addVote' value='1' />
<input type='hidden' name='token' value='<?php print htmlspecialchars($_COOKIE['AURSID']) ?>' />
<input type='submit' class='button' value='<?php print __('Submit'); ?>' />
</p>
</form>

24
web/html/packages.php
View file

@ -36,19 +36,20 @@ if (isset($_POST['IDs'])) {
# Determine what action to do
$output = "";
if (current_action("do_Flag")) {
if (check_token()) {
if (current_action("do_Flag")) {
$output = pkg_flag($atype, $ids, true);
} elseif (current_action("do_UnFlag")) {
} elseif (current_action("do_UnFlag")) {
$output = pkg_flag($atype, $ids, False);
} elseif (current_action("do_Adopt")) {
} elseif (current_action("do_Adopt")) {
$output = pkg_adopt($atype, $ids, true);
} elseif (current_action("do_Disown")) {
} elseif (current_action("do_Disown")) {
$output = pkg_adopt($atype, $ids, False);
} elseif (current_action("do_Vote")) {
} elseif (current_action("do_Vote")) {
$output = pkg_vote($atype, $ids, true);
} elseif (current_action("do_UnVote")) {
} elseif (current_action("do_UnVote")) {
$output = pkg_vote($atype, $ids, False);
} elseif (current_action("do_Delete")) {
} elseif (current_action("do_Delete")) {
if (isset($_POST['confirm_Delete'])) {
if (!isset($_POST['merge_Into']) || empty($_POST['merge_Into'])) {
$output = pkg_delete($atype, $ids, NULL);
@ -68,14 +69,15 @@ if (current_action("do_Flag")) {
else {
$output = __("The selected packages have not been deleted, check the confirmation checkbox.");
}
} elseif (current_action("do_Notify")) {
} elseif (current_action("do_Notify")) {
$output = pkg_notify($atype, $ids);
} elseif (current_action("do_UnNotify")) {
} elseif (current_action("do_UnNotify")) {
$output = pkg_notify($atype, $ids, False);
} elseif (current_action("do_DeleteComment")) {
} elseif (current_action("do_DeleteComment")) {
$output = pkg_delete_comment($atype);
} elseif (current_action("do_ChangeCategory")) {
} elseif (current_action("do_ChangeCategory")) {
$output = pkg_change_category($atype);
}
}
html_header($title);

10
web/html/pkgsubmit.php
View file

@ -27,10 +27,17 @@ if ($uid):
if (isset($_REQUEST['pkgsubmit'])) {
# Make sure authenticated user submitted the package themselves
if (!check_token()) {
$error = __("Invalid token for user action.");
}
# Before processing, make sure we even have a file
if (!$error) {
if ($_FILES['pfile']['size'] == 0){
$error = __("Error - No file uploaded");
}
}
# Check whether the file is gzip'ed
if (!$error) {
@ -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>

2
web/html/tu.php
View file

@ -72,7 +72,7 @@ if ($atype == "Trusted User" OR $atype == "Developer") {
}
if ($canvote == 1) {
if (isset($_POST['doVote'])) {
if (isset($_POST['doVote']) && check_token()) {
if (isset($_POST['voteYes'])) {
$myvote = "Yes";
} else if (isset($_POST['voteNo'])) {

1
web/lib/acctfuncs.inc.php
View file

@ -33,6 +33,7 @@ function display_account_form($UTYPE,$A,$U="",$T="",$S="",
print "<input type='hidden' name='Action' value='".$A."' />\n";
if ($UID) {
print "<input type='hidden' name='ID' value='".$UID."' />\n";
print "<input type='hidden' name='token' value='".htmlspecialchars($_COOKIE['AURSID'])."' />\n";
}
print "</fieldset>";
print "<table border='0' cellpadding='0' cellspacing='0' width='80%' style=\"margin:0 auto;\">\n";

10
web/lib/aur.inc.php
View file

@ -77,6 +77,16 @@ function check_sid($dbh=NULL) {
return;
}
# Verify the supplied token matches the expected token for POST forms
#
function check_token() {
if (isset($_POST['token'])) {
return ($_POST['token'] == $_COOKIE['AURSID']);
} else {
return false;
}
}
# verify that an email address looks like it is legitimate
#
function valid_email($addy) {

1
web/template/actions_form.php
View file

@ -3,6 +3,7 @@
<fieldset>
<input type='hidden' name='IDs[<?php echo $row['ID'] ?>]' value='1' />
<input type='hidden' name='ID' value="<?php echo $row['ID'] ?>" />
<input type='hidden' name='token' value="<?php echo htmlspecialchars($_COOKIE['AURSID']) ?>" />
<?php
# Voting Button
#

5
web/template/pkg_comment_form.php
View file

@ -1,6 +1,6 @@
<?php
# Add a comment to this package
if (isset($_REQUEST['comment'])) {
if (isset($_REQUEST['comment']) && check_token()) {
# Insert the comment
$dbh = db_connect();
@ -53,13 +53,14 @@ if (isset($_REQUEST['comment'])) {
<form action='<?php echo $_SERVER['REQUEST_URI'] ?>' method='post'>
<div style="padding: 1%">
<?php
if (isset($_REQUEST['comment'])) {
if (isset($_REQUEST['comment']) && check_token()) {
echo '<b>' . __('Comment has been added.') . '</b>';
}
?>
<input type='hidden' name='ID' value="<?php echo intval($_REQUEST['ID']) ?>" />
<?php echo __('Enter your comment below.') ?><br />
<textarea name='comment' cols='80' rows='10' style="width: 100%"></textarea><br />
<input type='hidden' name='token' value='<?php echo htmlspecialchars($_COOKIE['AURSID']) ?>' />
<input type='submit' value="<?php echo __("Submit") ?>" />
<input type='reset' value="<?php echo __("Reset") ?>" />
</div>

1
web/template/pkg_comments.php
View file

@ -15,6 +15,7 @@ while (list($indx, $carr) = each($comments)) { ?>
$durl.= '<fieldset style="display:inline;">';
$durl.= '<input type="hidden" name="action" value="do_DeleteComment" />';
$durl.= '<input type="hidden" name="comment_id" value="'.$carr['ID'].'" />';
$durl.= '<input type="hidden" name="token" value="'.htmlspecialchars($_COOKIE['AURSID']).'" />';
$durl.= '<input type="image" src="images/x.png" ';
$durl.= ' alt="'.__("Delete comment").'" name="submit" value="1" ';
$durl.= ' />&nbsp;';

3
web/template/pkg_details.php
View file

@ -10,6 +10,9 @@ if ($uid == $row["MaintainerUID"] or
$edit_cat = "<form method='post' action='packages.php?ID=".$pkgid."'>\n";
$edit_cat.= "<p>";
$edit_cat.= "<input type='hidden' name='action' value='do_ChangeCategory' />";
if ($SID) {
$edit_cat.= "<input type='hidden' name='token' value='".htmlspecialchars($_COOKIE['AURSID'])."' />";
}
$edit_cat.= "<span class='f3'>" . __("Category") . ":</span> ";
$edit_cat.= "<select name='category_id'>\n";
foreach ($catarr as $cid => $catname) {

1
web/template/pkg_search_results.php
View file

@ -114,6 +114,7 @@ for ($i = 0; $row = mysql_fetch_assoc($result); $i++) {
<input type='text' id='merge_Into' name='merge_Into' />
<input type='checkbox' name='confirm_Delete' value='1' /> <?php print __("Confirm") ?>
<?php endif; ?>
<input type='hidden' name='token' value='<?php print htmlspecialchars($_COOKIE['AURSID']) ?>' />
<input type='submit' class='button' style='width: 80px' value='<?php print __("Go") ?>' />
</div>
<?php endif; # if ($SID) ?>

1
web/template/tu_details.php
View file

@ -70,6 +70,7 @@ if (!$isrunning) { ?>
<input type='submit' class='button' name='voteNo' value='<?php print __("No") ?>' />
<input type='submit' class='button' name='voteAbstain' value='<?php print __("Abstain") ?>' />
<input type='hidden' name='doVote' value='1' />
<input type='hidden' name='token' value='<?php print htmlspecialchars($_COOKIE['AURSID']) ?>' />
</fieldset>
</form>
<?php } else { ?>