prosody-modules
460f78654864
mod_muc_rtbl/mod_muc_rtbl.lua

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mod_muc_rtbl/mod_muc_rtbl.lua @ 5173:460f78654864

mod_muc_rtbl: also filter messages This was a bit tricky because we don't want to run the JIDs through SHA256 on each message. Took a while to come up with this simple plan of just caching the SHA256 of the JIDs on the occupants. This will leave some dirt in the occupants after unloading the module, but that should be ok; once they cycle the room, the hashes will be gone. This is direly needed, otherwise, there is a tight race between the moderation activities and the actors joining the room.
author Jonas Schäfer <jonas@wielicki.name>
date Tue, 21 Feb 2023 21:37:27 +0100
parent 4813:0a257d1402c3
child 5174:354832098f2f
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rev   line source
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1 local array = require "util.array";
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2 local it = require "util.iterators";
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3 local jid = require "util.jid";
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4 local sha256 = require "util.hashes".sha256;
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5 local set = require "util.set";
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6 local st = require "util.stanza";
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7
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8 local rtbl_service_jid = assert(module:get_option_string("muc_rtbl_jid"), "No RTBL JID supplied");
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9 local rtbl_node = module:get_option_string("muc_rtbl_node", "muc_bans_sha256");
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10
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11 local banned_hashes = module:shared("banned_hashes");
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12
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13 module:depends("pubsub_subscription");
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14
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15 module:add_item("pubsub-subscription", {
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16 service = rtbl_service_jid;
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17 node = rtbl_node;
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18
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19 -- Callbacks:
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20 on_subscribed = function()
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21 module:log("info", "RTBL active");
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22 end;
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23
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24 on_error = function(err)
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25 module:log("error", "Failed to subscribe to RTBL: %s::%s: %s", err.type, err.condition, err.text);
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26 end;
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27
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28 on_item = function(event)
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29 local hash = event.item.attr.id;
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30 if not hash then return; end
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31 module:log("debug", "Received new hash: %s", hash);
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32 banned_hashes[hash] = true;
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33 end;
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34
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35 on_retract = function (event)
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36 local hash = event.item.attr.id;
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37 if not hash then return; end
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38 module:log("debug", "Retracted hash: %s", hash);
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39 banned_hashes[hash] = nil;
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40 end;
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41 });
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42
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43 function request_list()
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44 local items_request = st.iq({ to = rtbl_service_jid, from = module.host, type = "get", id = "rtbl-request" })
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45 :tag("pubsub", { xmlns = "http://jabber.org/protocol/pubsub" })
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46 :tag("items", { node = rtbl_node }):up()
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47 :up();
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48
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49 module:send(items_request);
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50 end
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51
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52 function update_list(event)
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53 local from_jid = event.stanza.attr.from;
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54 if from_jid ~= rtbl_service_jid then
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55 module:log("debug", "Ignoring RTBL response from unknown sender");
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56 return;
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57 end
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58 local items_el = event.stanza:find("{http://jabber.org/protocol/pubsub}pubsub/items");
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59 if not items_el then
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60 module:log("warn", "Invalid items response from RTBL service");
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61 return;
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62 end
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63
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64 local old_entries = set.new(array.collect(it.keys(banned_hashes)));
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65
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66 local n_added, n_removed, n_total = 0, 0, 0;
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67 for item in items_el:childtags("item") do
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68 local hash = item.attr.id;
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69 if hash then
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70 n_total = n_total + 1;
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71 if not old_entries:contains(hash) then
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72 -- New entry
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73 n_added = n_added + 1;
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74 banned_hashes[hash] = true;
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75 else
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76 -- Entry already existed
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77 old_entries:remove(hash);
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78 end
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79 end
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80 end
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81
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82 -- Remove old entries that weren't in the received list
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83 for hash in old_entries do
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84 n_removed = n_removed + 1;
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85 banned_hashes[hash] = nil;
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86 end
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87
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88 module:log("info", "%d RTBL entries received from %s (%d added, %d removed)", n_total, from_jid, n_added, n_removed);
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89 return true;
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90 end
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91
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92 module:hook("iq-result/host/rtbl-request", update_list);
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93
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94 function update_hashes(occupant)
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95 if not occupant.mod_muc_rtbl_bare_hash then
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96 local bare_hash = sha256(jid.bare(event.stanza.attr.from), true);
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97 occupant.mod_muc_rtbl_bare_hash = bare_hash;
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98 end
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99 if not occupant.mod_muc_rtbl_host_hash then
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100 local host_hash = sha256(jid.host(event.stanza.attr.from), true);
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101 event.occupant.mod_muc_rtbl_host_hash = host_hash;
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102 end
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103 end
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104
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105 module:hook("muc-occupant-pre-join", function (event)
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106 if next(banned_hashes) == nil then return end
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107
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108 local from_bare = jid.bare(event.stanza.attr.from);
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109
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110 local affiliation = event.room:get_affiliation(from_bare);
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111 if affiliation and affiliation ~= "none" then
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112 -- Skip check for affiliated users
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113 return;
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114 end
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115
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116 update_hashes(event.occupant);
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117 if banned_hashes[event.occupant.mod_muc_rtbl_bare_hash] or banned_hashes[event.occupant.mod_muc_rtbl_host_hash] then
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118 module:log("info", "Blocked user <%s> from room <%s> due to RTBL match", from_bare, event.stanza.attr.to);
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119 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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120 event.origin.send(error_reply);
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121 return true;
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122 end
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123 end);
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124
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125 module:hook("muc-occupant-groupchat", function(event)
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126 update_hashes(event.occupant);
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127 if banned_hashes[event.occupant.mod_muc_rtbl_bare_hash] or banned_hashes[event.occupant.mod_muc_rtbl_host_hash] then
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parents: 4813
diff changeset
128 module:log("debug", "Blocked message from user <%s> to room <%s> due to RTBL match", event.stanza.attr.from, event.stanza.attr.to);
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parents: 4813
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129 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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parents: 4813
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130 event.origin.send(error_reply);
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parents: 4813
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131 return true;
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parents: 4813
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132 end
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Jonas Schäfer <jonas@wielicki.name>
parents: 4813
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133 end);
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parents: 4813
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134
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parents: 4813
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135 module:hook("muc-private-message", function(event)
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parents: 4813
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136 local occupant = event.room:get_occupant_by_nick(event.stanza.attr.from);
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Jonas Schäfer <jonas@wielicki.name>
parents: 4813
diff changeset
137 update_hashes(occupant);
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Jonas Schäfer <jonas@wielicki.name>
parents: 4813
diff changeset
138 if banned_hashes[occupant.mod_muc_rtbl_bare_hash] or banned_hashes[occupant.mod_muc_rtbl_host_hash] then
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Jonas Schäfer <jonas@wielicki.name>
parents: 4813
diff changeset
139 module:log("debug", "Blocked private message from user <%s> from room <%s> due to RTBL match", occupant.bare_jid, event.stanza.attr.to);
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Jonas Schäfer <jonas@wielicki.name>
parents: 4813
diff changeset
140 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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Jonas Schäfer <jonas@wielicki.name>
parents: 4813
diff changeset
141 event.origin.send(error_reply);
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Jonas Schäfer <jonas@wielicki.name>
parents: 4813
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142 return true;
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Jonas Schäfer <jonas@wielicki.name>
parents: 4813
diff changeset
143 end
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Jonas Schäfer <jonas@wielicki.name>
parents: 4813
diff changeset
144 end);
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Jonas Schäfer <jonas@wielicki.name>
parents: 4813
diff changeset
145
4808
8a63a0daf129 mod_muc_rtbl: Sync existing list entries when first loaded
Matthew Wild <mwild1@gmail.com>
parents: 4807
diff changeset
146 if prosody.start_time then
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Matthew Wild <mwild1@gmail.com>
parents: 4807
diff changeset
147 request_list();
8a63a0daf129 mod_muc_rtbl: Sync existing list entries when first loaded
Matthew Wild <mwild1@gmail.com>
parents: 4807
diff changeset
148 else
4809
9e9ec0f0b128 mod_muc_rtbl: Fix to hook server-started globally, to fetch entries at startup (thanks mirux)
Matthew Wild <mwild1@gmail.com>
parents: 4808
diff changeset
149 module:hook_global("server-started", function ()
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Matthew Wild <mwild1@gmail.com>
parents: 4808
diff changeset
150 request_list();
9e9ec0f0b128 mod_muc_rtbl: Fix to hook server-started globally, to fetch entries at startup (thanks mirux)
Matthew Wild <mwild1@gmail.com>
parents: 4808
diff changeset
151 end);
4808
8a63a0daf129 mod_muc_rtbl: Sync existing list entries when first loaded
Matthew Wild <mwild1@gmail.com>
parents: 4807
diff changeset
152 end