File

plugins/mod_watchregistrations.lua @ 12181:783056b4e448 0.11 0.11.12

util.xml: Do not allow doctypes, comments or processing instructions Yes. This is as bad as it sounds. CVE pending. In Prosody itself, this only affects mod_websocket, which uses util.xml to parse the <open/> frame, thus allowing unauthenticated remote DoS using Billion Laughs. However, third-party modules using util.xml may also be affected by this. This commit installs handlers which disallow the use of doctype declarations and processing instructions without any escape hatch. It, by default, also introduces such a handler for comments, however, there is a way to enable comments nontheless. This is because util.xml is used to parse human-facing data, where comments are generally a desirable feature, and also because comments are generally harmless.
author Jonas Schäfer <jonas@wielicki.name>
date Mon, 10 Jan 2022 18:23:54 +0100
parent 8812:3d7fceaff230
child 12977:74b9e05af71e
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-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--


local host = module:get_host();
local jid_prep = require "util.jid".prep;

local registration_watchers = module:get_option_set("registration_watchers", module:get_option("admins", {})) / jid_prep;
local registration_from = module:get_option_string("registration_from", host);
local registration_notification = module:get_option_string("registration_notification", "User $username just registered on $host from $ip");
local msg_type = module:get_option_string("registration_notification_type", "chat");

local st = require "util.stanza";

module:hook("user-registered", function (user)
	module:log("debug", "Notifying of new registration");
	local message = st.message{ type = msg_type, from = registration_from }
		:tag("body")
			:text(registration_notification:gsub("%$(%w+)", function (v)
				return user[v] or user.session and user.session[v] or nil;
			end))
		:up();
	for jid in registration_watchers do
		module:log("debug", "Notifying %s", jid);
		message.attr.to = jid;
		module:send(message);
	end
end);