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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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10
web/lib/aur.inc.php
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@ -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) {