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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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1
web/lib/acctfuncs.inc.php
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@ -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";