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login: regenerate sessiono token on login; make returnto sanitisation more intelligent

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Starbeamrainbowlabs 2021-09-27 21:32:39 +01:00
parent 4f3a1c3757
commit fa407ce99d
Signed by: sbrl
GPG key ID: 1BE5172E637709C2
2 changed files with 12 additions and 6 deletions
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2
Changelog.md
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@ -6,12 +6,14 @@ This file holds the changelog for Pepperminty Wiki. This is the master list of t
### Changed ### Changed
- Display returnto URL above the login form if present to further mitigate CSRF issues - Display returnto URL above the login form if present to further mitigate CSRF issues
- Improve `returnto` sanitisation to be more intelligent
### Fixed ### Fixed
- [security] Fixed an XSS vulnerability in the `format` GET parameter of the `stats` action (thanks, @JamieSlome) - [security] Fixed an XSS vulnerability in the `format` GET parameter of the `stats` action (thanks, @JamieSlome)
- [security] Ensured that the `returnto` GET parameter leads you only to another place on your Pepperminty Wiki instance (thanks, @JamieSlome) - [security] Ensured that the `returnto` GET parameter leads you only to another place on your Pepperminty Wiki instance (thanks, @JamieSlome)
- [security] Ensure that Javascript in SVGs never gets executed (it's too challenging to strip it, since it could be lurking in many different places - according to [this answer](https://stackoverflow.com/a/68505306/1460422) even Inkscape doesn't strip all Javascript when asked to) - [security] Ensure that Javascript in SVGs never gets executed (it's too challenging to strip it, since it could be lurking in many different places - according to [this answer](https://stackoverflow.com/a/68505306/1460422) even Inkscape doesn't strip all Javascript when asked to)
- [security] Fixed XSS when the `action` GET param doesn't match a known action - [security] Fixed XSS when the `action` GET param doesn't match a known action
- [security] Further avoid session fixation attacks by regenerating session ids after login (session cookies are already marked as `HttpOnly`)
## v0.23 ## v0.23

16
modules/page-login.php
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@ -5,7 +5,7 @@
register_module([ register_module([
"name" => "Login", "name" => "Login",
"version" => "0.9.6", "version" => "0.9.7",
"author" => "Starbeamrainbowlabs", "author" => "Starbeamrainbowlabs",
"description" => "Adds a pair of actions (login and checklogin) that allow users to login. You need this one if you want your users to be able to login.", "description" => "Adds a pair of actions (login and checklogin) that allow users to login. You need this one if you want your users to be able to login.",
"id" => "page-login", "id" => "page-login",
@ -125,6 +125,11 @@ register_module([
// Success! :D // Success! :D
// Avoid a session fixation attack
// Ref https://guides.codepath.com/websecurity/Session-Fixation
session_regenerate_id(true);
// Update the environment // Update the environment
$env->is_logged_in = true; $env->is_logged_in = true;
$env->user = $user; $env->user = $user;
@ -155,12 +160,11 @@ register_module([
$_SESSION["$settings->sessionprefix-expiretime"] = time() + 60*60*24*30; // 30 days from now $_SESSION["$settings->sessionprefix-expiretime"] = time() + 60*60*24*30; // 30 days from now
$returnto_redirect = $_GET["returnto"]; $returnto_redirect = $_GET["returnto"];
if(strpos($returnto_redirect, "?") === false) {
http_response_code(400); $returnto_parsed = parse_url($returnto_redirect);
exit(page_renderer::render_main("Login error - $settings->sitename", "<p>Your credentials were correct, but the 'returnto' URL specified (in the <code>returnto</code> GET parameter) did not contain a question mark. To protect you from being redirected to another site, $settings->sitename only allows redirects that do not leave $settings->sitename.</p>"));
}
// Ensure that this redirect takes to only somewhere else in this site // Ensure that this redirect takes to only somewhere else in this site
$returnto_redirect = substr($returnto_redirect, strpos($returnto_redirect, "?")); $returnto_redirect = "?{$returnto_parsed["query"]}";
// Redirect to wherever the user was going // Redirect to wherever the user was going
http_response_code(302); http_response_code(302);