-- Clients Connection Throttler.
-- Usage:
-- Add the module into modules loaded into the virtual host section
--
-- cthrottler_logins_count = 3 -> number of logins attempt allowed
-- cthrottler_time = 120 -> in x seconds
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)