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annotate mod_muc_ban_ip/mod_muc_ban_ip.lua @ 5531:af2778f4ee29

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mod_firewall: scripts: spam-blocking.pfw: Add special handling for MUC invites
author Matthew Wild <mwild1@gmail.com>
date Thu, 08 Jun 2023 11:28:56 +0100
parents 47d9f704d14b
children
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1005
591590de34ef mod_muc_ban_ip: When a user is banned from a MUC, ban their IP from the MUC also (works for remote rooms too)
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1 module:set_global();
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2
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3 local jid_bare, jid_host = require "util.jid".bare, require "util.jid".host;
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4 local st = require "util.stanza";
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5 local xmlns_muc_user = "http://jabber.org/protocol/muc#user";
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6
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7 local trusted_services = module:get_option_inherited_set("muc_ban_ip_trusted_services", {});
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8 local trust_local_restricted_services = module:get_option_boolean("muc_ban_ip_trust_local_restricted_services", true);
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9
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10 local ip_bans = module:shared("bans");
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11 local full_sessions = prosody.full_sessions;
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12
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13 local function is_local_restricted_service(host)
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14 local muc_service = prosody.hosts[host] and prosody.hosts[host].modules.muc;
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15 if muc_service and module:context(host):get_option("restrict_room_creation") ~= nil then -- COMPAT: May need updating post-0.12
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16 return true;
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17 end
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18 return false;
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19 end
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21 local function ban_ip(session, from)
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22 local ip = session.ip;
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23 if not ip then
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24 module:log("warn", "Failed to ban IP (IP unknown) for %s", session.full_jid);
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25 return;
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26 end
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27 local from_host = jid_host(from);
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28 if trusted_services:contains(from_host) or (trust_local_restricted_services and is_local_restricted_service(from_host)) then
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29 from = from_host; -- Ban from entire host
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30 end
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31 local banned_from = ip_bans[ip];
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32 if not banned_from then
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33 banned_from = {};
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34 ip_bans[ip] = banned_from;
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35 end
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36 banned_from[from] = true;
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37 module:log("debug", "Added ban for IP address %s from %s", ip, from);
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38 end
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39
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40 local function check_for_incoming_ban(event)
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41 local stanza = event.stanza;
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42 local to_session = full_sessions[stanza.attr.to];
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43 if to_session then
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44 local directed = to_session.directed;
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45 local from = stanza.attr.from;
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46 if directed and directed[from] and stanza.attr.type == "unavailable" then
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47 -- This is a stanza from somewhere we sent directed presence to (may be a MUC)
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48 local x = stanza:get_child("x", xmlns_muc_user);
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49 if x then
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50 for status in x:childtags("status") do
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51 if status.attr.code == '301' then
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52 ban_ip(to_session, jid_bare(from));
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53 end
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54 end
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55 end
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56 end
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57 end
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58 end
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59
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60 local function check_for_ban(event)
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61 local origin, stanza = event.origin, event.stanza;
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62 local ip = origin.ip;
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63 local to, to_host = jid_bare(stanza.attr.to), jid_host(stanza.attr.to);
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64 if ip_bans[ip] and (ip_bans[ip][to] or ip_bans[ip][to_host]) then
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65 (origin.log or module._log)("debug", "IP banned: %s is banned from %s", ip, to)
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66 if stanza.attr.type ~= "error" then
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67 origin.send(st.error_reply(stanza, "auth", "forbidden")
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68 :tag("x", { xmlns = xmlns_muc_user })
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69 :tag("status", { code = '301' }));
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70 end
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71 return true;
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72 end
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73 (origin.log or module._log)("debug", "IP not banned: %s from %s", ip, to)
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74 end
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75
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76 function module.add_host(module)
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77 module:hook("presence/full", check_for_incoming_ban, 100);
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78 module:hook("pre-presence/full", check_for_ban, 100);
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79 end