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annotate mod_muc_rtbl/mod_muc_rtbl.lua @ 4807:62a65c52c3f5

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mod_muc_rtbl: Real-time blocklist checks for MUC services
author Matthew Wild <mwild1@gmail.com>
date Sun, 05 Dec 2021 18:22:47 +0000
parents
children 8a63a0daf129
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4807
62a65c52c3f5 mod_muc_rtbl: Real-time blocklist checks for MUC services
Matthew Wild <mwild1@gmail.com>
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1 local jid = require "util.jid";
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2 local sha256 = require "util.hashes".sha256;
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3 local st = require "util.stanza";
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4
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5 local rtbl_service_jid = assert(module:get_option_string("muc_rtbl_jid"), "No RTBL JID supplied");
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6 local rtbl_node = module:get_option_string("muc_rtbl_node", "muc_bans_sha256");
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7
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8 local banned_hashes = module:shared("banned_hashes");
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9
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10 module:depends("pubsub_subscription");
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11
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12 module:add_item("pubsub-subscription", {
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13 service = rtbl_service_jid;
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14 node = rtbl_node;
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15
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16 -- Callbacks:
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17 on_subscribed = function()
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18 module:log("info", "RTBL active");
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19 end;
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20
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21 on_error = function(err)
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22 module:log("error", "Failed to subscribe to RTBL: %s::%s: %s", err.type, err.condition, err.text);
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23 end;
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24
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25 on_item = function(event)
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26 local hash = event.item.attr.id;
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27 if not hash then return; end
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28 module:log("debug", "Received new hash: %s", hash);
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29 banned_hashes[hash] = hash;
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30 end;
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31
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32 on_retract = function (event)
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33 local hash = event.item.attr.id;
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34 if not hash then return; end
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35 module:log("debug", "Retracted hash: %s", hash);
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36 banned_hashes[hash] = nil;
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37 end;
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38 });
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39
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40 module:hook("muc-occupant-pre-join", function (event)
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41 local from_bare = jid.bare(event.stanza.attr.from);
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42 local hash = sha256(jid.bare(event.stanza.attr.from), true);
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43 if banned_hashes[hash] then
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44 module:log("info", "Blocked user <%s> from room <%s> due to RTBL match", from_bare, event.stanza.attr.to);
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45 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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46 event.origin.send(error_reply);
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47 return true;
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48 end
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49 end);