view mod_c2s_conn_throttle/mod_c2s_conn_throttle.lua @ 4976:75b6e5df65f9

various: Improve error reporting if missing file server module on 0.12 If there is some error loading net.http.files then it would be swallowed by the pcall and then it would proceed to trying mod_http_files, which might cause unexpected behavior on 0.12 Ref #1765
author Kim Alvefur <zash@zash.se>
date Mon, 18 Jul 2022 22:47:54 +0200
parents 7dbde05b48a9
children e79f9dec35c0
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-- Clients Connection Throttler.
-- (C) 2012-2013, Marco Cirillo (LW.Org)

local time = os.time
local in_count = {}
local logins_count = module:get_option_number("cthrottler_logins_count", 3)
local throttle_time = module:get_option_number("cthrottler_time", 60)

local function handle_sessions(event)
	local session = event.origin

	if not in_count[session.ip] and session.type == "c2s_unauthed" then
		in_count[session.ip] = { t = time(), c = 1 }
	elseif in_count[session.ip] and session.type == "c2s_unauthed" then
		if in_count[session.ip].starttls_c then in_count[session.ip].c = in_count[session.ip].starttls_c else in_count[session.ip].c = in_count[session.ip].c + 1 end

		if in_count[session.ip].c > logins_count and time() - in_count[session.ip].t < throttle_time then
			module:log("error", "Exceeded login count for %s, closing connection", session.ip)
			session:close{ condition = "policy-violation", text = "You exceeded the number of connections/logins allowed in "..throttle_time.." seconds, good bye." }
			return true
		elseif time() - in_count[session.ip].t > throttle_time then
			in_count[session.ip] = nil ; return
		end
	end
end

local function check_starttls(event)
	local session = event.origin

	if in_count[session.ip] and type(in_count[session.ip].starttls_c) ~= "number" and session.type == "c2s_unauthed" then
		in_count[session.ip].starttls_c = 1
	elseif in_count[session.ip] and type(in_count[session.ip].starttls_c) == "number" and session.type == "c2s_unauthed" then
		in_count[session.ip].starttls_c = in_count[session.ip].starttls_c + 1
	end
end

module:hook("stream-features", handle_sessions, 100)
module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", check_starttls, 100)