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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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12
web/html/account.php
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@ -88,11 +88,13 @@ if (isset($_COOKIE["AURSID"])) {
} elseif ($action == "UpdateAccount") {
# user is submitting their modifications to an existing account
#
process_account_form($atype, "edit", "UpdateAccount",
in_request("U"), in_request("T"), in_request("S"),
in_request("E"), in_request("P"), in_request("C"),
in_request("R"), in_request("L"), in_request("I"),
in_request("ID"));
if (check_token()) {
process_account_form($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 {