-- (C) 2011, Marco Cirillo (LW.Org)
-- Block or restrict by blacklist remote access to local components or hosts.
module:set_global()
local hosts = hosts
local incoming_s2s = prosody.incoming_s2s
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 config = configmanager
local error_reply = require "util.stanza".error_reply
local tostring = tostring
local function s2s_hook (event)
local origin, stanza = event.session or event.origin, event.stanza or false
local to_host, from_host = (not stanza and origin.to_host) or stanza.attr.to, (not stanza and origin.from_host) or stanza.attr.from
if origin.type == "s2sin" or origin.type == "s2sin_unauthed" then
if guard_blockall:contains(to_host) and not guard_ball_wl:contains(from_host) or
guard_block_bl:contains(from_host) and guard_protect:contains(to_host) then
module:log("error", "remote service %s attempted to access restricted host %s", from_host, to_host)
origin:close({condition = "policy-violation", text = "You're not authorized, good bye."})
return false
end
end
return nil
end
local function rr_hook (event)
local from_host, to_host, send, stanza = event.from_host, event.to_host, (event.origin and event.origin.send) or function() end, event.stanza
if guard_blockall:contains(from_host) and not guard_ball_wl:contains(to_host) or
guard_block_bl:contains(to_host) and guard_protect:contains(from_host) then
module:log("info", "attempted to connect to a filtered remote host %s", to_host)
if stanza.attr.type ~= "error" then send(error_reply(event.stanza, "cancel", "policy-violation", "Communicating with a filtered remote server is not allowed.")) end
return true
end
return nil
end
local function handle_activation (host, u)
if guard_blockall:contains(host) or guard_protect:contains(host) then
if hosts[host] and config.get(host, "core", "authentication") ~= "anonymous" then
hosts[host].events.add_handler("s2sin-established", s2s_hook, 500)
hosts[host].events.add_handler("route/remote", rr_hook, 500)
hosts[host].events.add_handler("stanza/jabber:server:dialback:result", s2s_hook, 500)
if not u then
module:log ("debug", "adding host protection for: "..host)
else
module:log ("debug", "updating or adding host protection for: "..host)
end
end
end
end
local function handle_deactivation (host, u, i)
if guard_blockall:contains(host) or guard_protect:contains(host) then
if hosts[host] and config.get(host, "core", "authentication") ~= "anonymous" then
hosts[host].events.remove_handler("s2sin-established", s2s_hook)
hosts[host].events.remove_handler("route/remote", rr_hook)
hosts[host].events.remove_handler("stanza/jabber:server:dialback:result", s2s_hook)
if not u and not i then module:log ("debug", "removing host protection for: "..host) end
end
end
end
local function close_filtered()
for _, host in pairs(hosts) do
for name, session in pairs(host.s2sout) do
if guard_blockall:contains(session.host) and not guard_ball_wl:contains(session.to_host) or
guard_block_bl:contains(session.to_host) and guard_protect:contains(session.host) then
module:log("info", "closing down s2s outgoing stream to filtered entity %s", tostring(session.to_host))
session:close()
end
end
end
for session in pairs(incoming_s2s) do
if session.to_host and session.from_host and
(guard_blockall:contains(session.to_host) and not guard_ball_wl:contains(session.from_host) or
guard_block_bl:contains(session.from_host) and guard_protect:contains(session.to_host)) then
module:log("info", "closing down s2s incoming stream from filtered entity %s", tostring(session.from_host))
session:close()
end
end
end
local function init_hosts(u, i)
for n in pairs(hosts) do
if guard_blockall:contains(n) or guard_protect:contains(n) then
handle_deactivation(n, u, i) ; handle_activation(n, u)
end
end
close_filtered()
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(true)
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(false, true)
end
function module.unload()
module:log ("debug", "removing host handlers as module is being unloaded...")
for n in pairs(hosts) do
hosts[n].events.remove_handler("s2sin-established", s2s_hook)
hosts[n].events.remove_handler("route/remote", rr_hook)
hosts[n].events.remove_handler("stanza/jabber:server:dialback:result", s2s_hook)
end
end
if prosody.start_time then
setup()
else
module:hook ("server-started", setup)
end