File

plugins/mod_uptime.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 9572:867e40b82409
child 10565:421b2f8369fd
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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 st = require "util.stanza";

local start_time = prosody.start_time;
module:hook_global("server-started", function() start_time = prosody.start_time end);

-- XEP-0012: Last activity
module:add_feature("jabber:iq:last");

module:hook("iq-get/host/jabber:iq:last:query", function(event)
	local origin, stanza = event.origin, event.stanza;
	origin.send(st.reply(stanza):tag("query", {xmlns = "jabber:iq:last", seconds = tostring(os.difftime(os.time(), start_time))}));
	return true;
end);

-- Ad-hoc command
module:depends "adhoc";
local adhoc_new = module:require "adhoc".new;

function uptime_text()
	local t = os.time()-prosody.start_time;
	local seconds = t%60;
	t = (t - seconds)/60;
	local minutes = t%60;
	t = (t - minutes)/60;
	local hours = t%24;
	t = (t - hours)/24;
	local days = t;
	return string.format("This server has been running for %d day%s, %d hour%s and %d minute%s (since %s)",
		days, (days ~= 1 and "s") or "", hours, (hours ~= 1 and "s") or "",
		minutes, (minutes ~= 1 and "s") or "", os.date("%c", prosody.start_time));
end

function uptime_command_handler ()
	return { info = uptime_text(), status = "completed" };
end

local descriptor = adhoc_new("Get uptime", "uptime", uptime_command_handler);

module:provides("adhoc", descriptor);