mod_host_guard: fixed plugin, minor code refactor.
-- (C) 2011, Marco Cirillo (LW.Org)
-- Block or restrict by blacklist remote access to local components or hosts.
module:set_global()
local guard_blockall = module:get_option_set("host_guard_blockall", {})
local guard_ball_wl = module:get_option_set("host_guard_blockall_exceptions", {})
local guard_protect = module:get_option_set("host_guard_selective", {})
local guard_block_bl = module:get_option_set("host_guard_blacklist", {})
local s2smanager = require "core.s2smanager"
local config = require "core.configmanager"
local nameprep = require "util.encodings".stringprep.nameprep
local _make_connect = s2smanager.make_connect
function s2smanager.make_connect(session, connect_host, connect_port)
if not session.s2sValidation then
if guard_blockall:contains(session.from_host) and not guard_ball_wl:contains(session.to_host) or
guard_block_bl:contains(session.to_host) and guard_protect:contains(session.from_host) then
module:log("error", "remote service %s attempted to access restricted host %s", session.to_host, session.from_host)
s2smanager.destroy_session(session, "You're not authorized, good bye.")
return false;
end
end
return _make_connect(session, connect_host, connect_port)
end
local _stream_opened = s2smanager.streamopened
function s2smanager.streamopened(session, attr)
local host = attr.to and nameprep(attr.to)
local from = attr.from and nameprep(attr.from)
if not from then
session.s2sValidation = false
else
session.s2sValidation = true
end
if guard_blockall:contains(host) and not guard_ball_wl:contains(from) or
guard_block_bl:contains(from) and guard_protect:contains(host) then
module:log("error", "remote service %s attempted to access restricted host %s", from, host)
session:close({condition = "policy-violation", text = "You're not authorized, good bye."})
return false;
end
_stream_opened(session, attr)
end
local function sdr_hook (event)
local origin, stanza = event.origin, event.stanza
if origin.type == "s2sin" or origin.type == "s2sin_unauthed" then
if guard_blockall:contains(stanza.attr.to) and not guard_ball_wl:contains(stanza.attr.from) or
guard_block_bl:contains(stanza.attr.from) and guard_protect:contains(stanza.attr.to) then
module:log("error", "remote service %s attempted to access restricted host %s", stanza.attr.from, stanza.attr.to)
origin:close({condition = "policy-violation", text = "You're not authorized, good bye."})
return false
end
end
return nil
end
local function handle_activation (host)
if guard_blockall:contains(host) or guard_protect:contains(host) then
if hosts[host] and hosts[host].events then
hosts[host].events.add_handler("stanza/jabber:server:dialback:result", sdr_hook, 100)
module:log ("debug", "adding host protection for: "..host)
end
end
end
local function handle_deactivation (host)
if guard_blockall:contains(host) or guard_protect:contains(host) then
if hosts[host] and hosts[host].events then
hosts[host].events.remove_handler("stanza/jabber:server:dialback:result", sdr_hook)
module:log ("debug", "removing host protection for: "..host)
end
end
end
local function init_hosts()
for n,table in pairs(hosts) do
hosts[n].events.remove_handler("stanza/jabber:server:dialback:result", sdr_hook)
if guard_blockall:contains(n) or guard_protect:contains(n) then handle_activation(n) end
end
end
local function reload()
module:log ("debug", "server configuration reloaded, rehashing plugin tables...")
guard_blockall = module:get_option_set("host_guard_blockall", {})
guard_ball_wl = module:get_option_set("host_guard_blockall_exceptions", {})
guard_protect = module:get_option_set("host_guard_selective", {})
guard_block_bl = module:get_option_set("host_guard_blacklist", {})
init_hosts()
end
local function setup()
module:log ("debug", "initializing host guard module...")
module:hook ("host-activated", handle_activation)
module:hook ("host-deactivated", handle_deactivation)
module:hook ("config-reloaded", reload)
init_hosts()
end
if prosody.start_time then
setup()
else
module:hook ("server-started", setup)
end