prosody-modules
27529031890b
mod_host_guard/mod_host_guard.lua

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mod_host_guard/mod_host_guard.lua @ 684:27529031890b

mod_host_guard: now a proper error is returned when stanzas are routed to a filtered remote server (thanks Zash)
author Marco Cirillo <maranda@lightwitch.org>
date Sun, 27 May 2012 02:44:06 +0000
parent 683:939f8fc84d49
child 685:19698c5f3ab3
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rev   line source
493
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1 -- (C) 2011, Marco Cirillo (LW.Org)
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2 -- Block or restrict by blacklist remote access to local components or hosts.
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3
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4 module:set_global()
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5
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6 local guard_blockall = module:get_option_set("host_guard_blockall", {})
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7 local guard_ball_wl = module:get_option_set("host_guard_blockall_exceptions", {})
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8 local guard_protect = module:get_option_set("host_guard_selective", {})
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9 local guard_block_bl = module:get_option_set("host_guard_blacklist", {})
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10
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11 local config = require "core.configmanager"
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12 local error_reply = require "util.stanza".error_reply
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13 local nameprep = require "util.encodings".stringprep.nameprep
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14
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15 local function s2s_hook (event)
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16 local origin, stanza = event.session or event.origin, event.stanza or false
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17 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
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19 if origin.type == "s2sin" or origin.type == "s2sin_unauthed" then
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20 if guard_blockall:contains(to_host) and not guard_ball_wl:contains(from_host) or
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21 guard_block_bl:contains(from_host) and guard_protect:contains(to_host) then
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22 module:log("error", "remote service %s attempted to access restricted host %s", from_host, to_host)
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23 origin:close({condition = "policy-violation", text = "You're not authorized, good bye."})
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24 return false
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25 end
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26 end
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27
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28 return nil
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29 end
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30
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31 local function rr_hook (event)
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32 local from_host, to_host, send, stanza = event.from_host, event.to_host, event.origin.send, event.stanza
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33
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34 if guard_blockall:contains(from_host) and not guard_ball_wl:contains(to_host) or
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35 guard_block_bl:contains(to_host) and guard_protect:contains(from_host) then
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36 module:log("info", "attempted to connect to a filtered remote host %s", to_host)
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37 if stanza.attr.type ~= "error" then send(error_reply(event.stanza, "cancel", "policy-violation", "Communicating with a filtered remote server is not allowed.")) end
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38 return true
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39 end
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41 return nil
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42 end
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43
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44 local function handle_activation (host)
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45 if guard_blockall:contains(host) or guard_protect:contains(host) then
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46 if hosts[host] and hosts[host].events then
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47 hosts[host].events.add_handler("s2sin-established", s2s_hook, 500)
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48 hosts[host].events.add_handler("route/remote", rr_hook, 500)
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49 hosts[host].events.add_handler("stanza/jabber:server:dialback:result", s2s_hook, 500)
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50 module:log ("debug", "adding host protection for: "..host)
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51 end
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52 end
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53 end
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54
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55 local function handle_deactivation (host)
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56 if guard_blockall:contains(host) or guard_protect:contains(host) then
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57 if hosts[host] and hosts[host].events then
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58 hosts[host].events.remove_handler("s2sin-established", s2s_hook)
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59 hosts[host].events.remove_handler("route/remote", rr_hook)
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60 hosts[host].events.remove_handler("stanza/jabber:server:dialback:result", s2s_hook)
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61 module:log ("debug", "removing host protection for: "..host)
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62 end
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63 end
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64 end
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65
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66 local function init_hosts()
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67 for n,table in pairs(hosts) do
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68 hosts[n].events.remove_handler("s2sin-established", s2s_hook)
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69 hosts[n].events.remove_handler("route/remote", rr_hook)
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70 hosts[n].events.remove_handler("stanza/jabber:server:dialback:result", s2s_hook)
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71 if guard_blockall:contains(n) or guard_protect:contains(n) then handle_activation(n) end
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72 end
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73 end
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74
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75 local function reload()
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76 module:log ("debug", "server configuration reloaded, rehashing plugin tables...")
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77 guard_blockall = module:get_option_set("host_guard_blockall", {})
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78 guard_ball_wl = module:get_option_set("host_guard_blockall_exceptions", {})
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79 guard_protect = module:get_option_set("host_guard_selective", {})
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80 guard_block_bl = module:get_option_set("host_guard_blacklist", {})
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81
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82 init_hosts()
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83 end
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84
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85 local function setup()
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86 module:log ("debug", "initializing host guard module...")
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87 module:hook ("host-activated", handle_activation)
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88 module:hook ("host-deactivated", handle_deactivation)
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89 module:hook ("config-reloaded", reload)
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90
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91 init_hosts()
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92 end
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93
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94 if prosody.start_time then
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95 setup()
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96 else
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97 module:hook ("server-started", setup)
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98 end