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annotate plugins/muc/occupant_id.lib.lua @ 12525:8087f5357f53 0.12

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mod_smacks: Fix bounce of stanzas directed to full JID on unclean disconnect Fixes #1758 Introduced in 1ea01660c79a In e62025f949f9 to and from was inverted since it changed from acting on a reply to acting on the original stanza (or a clone thereof) Unsure of the purpose of this check, you don't usually send stanzas to your own full JID. Perhaps guarding against routing loops? The check was present in the original commit of mod_smacks, prosody-modules rev 9a7671720dec
author Kim Alvefur <zash@zash.se>
date Fri, 27 May 2022 12:05:47 +0200
parents e9882c4c397f
children 74b9e05af71e
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1 -- Implementation of https://xmpp.org/extensions/inbox/occupant-id.html
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2 -- XEP-0421: Anonymous unique occupant identifiers for MUCs
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3
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4 -- (C) 2020 Maxime “pep” Buquet <pep@bouah.net>
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5 -- (C) 2020 Matthew Wild <mwild1@gmail.com>
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6
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7 local uuid = require "util.uuid";
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8 local hmac_sha256 = require "util.hashes".hmac_sha256;
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9 local b64encode = require "util.encodings".base64.encode;
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10
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11 local xmlns_occupant_id = "urn:xmpp:occupant-id:0";
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12
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13 local function get_room_salt(room)
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14 local salt = room._data.occupant_id_salt;
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15 if not salt then
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16 salt = uuid.generate();
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17 room._data.occupant_id_salt = salt;
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18 end
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19 return salt;
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20 end
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21
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22 local function get_occupant_id(room, occupant)
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23 if occupant.stable_id then
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24 return occupant.stable_id;
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25 end
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26
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27 local salt = get_room_salt(room)
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28
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29 occupant.stable_id = b64encode(hmac_sha256(occupant.bare_jid, salt));
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30
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31 return occupant.stable_id;
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32 end
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33
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34 local function update_occupant(event)
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35 local stanza, room, occupant, dest_occupant = event.stanza, event.room, event.occupant, event.dest_occupant;
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36
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37 -- "muc-occupant-pre-change" provides "dest_occupant" but not "occupant".
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38 if dest_occupant ~= nil then
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39 occupant = dest_occupant;
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40 end
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41
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42 -- strip any existing <occupant-id/> tags to avoid forgery
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43 stanza:remove_children("occupant-id", xmlns_occupant_id);
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44
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45 local unique_id = get_occupant_id(room, occupant);
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46 stanza:tag("occupant-id", { xmlns = xmlns_occupant_id, id = unique_id }):up();
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47 end
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48
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49 local function muc_private(event)
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50 local stanza, room = event.stanza, event.room;
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51 local occupant = room._occupants[stanza.attr.from];
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52
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53 update_occupant({
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54 stanza = stanza,
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55 room = room,
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56 occupant = occupant,
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57 });
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58 end
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59
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60 if module:get_option_boolean("muc_occupant_id", true) then
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61 module:add_feature(xmlns_occupant_id);
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62 module:hook("muc-disco#info", function (event)
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63 event.reply:tag("feature", { var = xmlns_occupant_id }):up();
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64 end);
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65
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66 module:hook("muc-broadcast-presence", update_occupant);
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67 module:hook("muc-occupant-pre-join", update_occupant);
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68 module:hook("muc-occupant-pre-change", update_occupant);
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69 module:hook("muc-occupant-groupchat", update_occupant);
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70 module:hook("muc-private-message", muc_private);
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71 end
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72
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73 return {
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74 get_room_salt = get_room_salt;
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75 get_occupant_id = get_occupant_id;
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76 };