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annotate mod_muc_access_control/mod_muc_access_control.lua @ 5461:06640647d193

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mod_http_oauth2: Fix use of arbitrary ports in loopback redirect URIs Per draft-ietf-oauth-v2-1-08#section-8.4.2 > The authorization server MUST allow any port to be specified at the > time of the request for loopback IP redirect URIs, to accommodate > clients that obtain an available ephemeral port from the operating > system at the time of the request. Uncertain if it should normalize the host part, but it also seems harmless to treat IPv6 and IPv4 the same here. One thing is that "localhost" is NOT RECOMMENDED because it can sometimes be pointed to non-loopback interfaces via DNS or hosts file.
author Kim Alvefur <zash@zash.se>
date Wed, 17 May 2023 13:51:30 +0200
parents f54c80404ad3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local st = require "util.stanza";
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2 local jid = require "util.jid";
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3 local nodeprep = require "util.encodings".stringprep.nodeprep;
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4
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5 local unprepped_access_lists = module:get_option("muc_access_lists", {});
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6 local access_lists = {};
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7
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8 -- Make sure all input is prepped
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9 for unprepped_room_name, unprepped_list in pairs(unprepped_access_lists) do
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10 local prepped_room_name = nodeprep(unprepped_room_name);
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11 if not prepped_room_name then
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12 module:log("error", "Invalid room name: %s", unprepped_room_name);
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13 else
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14 local prepped_list = {};
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15 for _, unprepped_jid in ipairs(unprepped_list) do
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16 local prepped_jid = jid.prep(unprepped_jid);
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17 if not prepped_jid then
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18 module:log("error", "Invalid JID: %s", unprepped_jid);
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19 else
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20 prepped_list[prepped_jid] = true;
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21 end
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22 end
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23 access_lists[prepped_room_name] = prepped_list;
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24 end
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25 end
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26
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27 local function is_restricted(room, who)
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28 local allowed = access_lists[room];
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29
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30 if allowed == nil or allowed[who] or allowed[select(2, jid.split(who))] then
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31 return nil;
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32 end
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33
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34 return "forbidden";
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35 end
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36
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37 module:hook("presence/full", function(event)
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38 local stanza = event.stanza;
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39
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40 if stanza.name == "presence" and stanza.attr.type == "unavailable" then -- Leaving events get discarded
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41 return;
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42 end
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43
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44 -- Get the room
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45 local room = jid.split(stanza.attr.to);
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46 if not room then return; end
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47
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48 -- Get who has tried to join it
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49 local who = jid.bare(stanza.attr.from)
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50
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51 -- Checking whether room is restricted
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52 local check_restricted = is_restricted(room, who)
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53 if check_restricted ~= nil then
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54 event.allowed = false;
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55 event.stanza.attr.type = 'error';
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56 return event.origin.send(st.error_reply(event.stanza, "cancel", "forbidden", "You're not allowed to enter this room: " .. check_restricted));
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57 end
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58 end, 10);