Mercurial > prosody-modules

annotate mod_muc_rtbl/mod_muc_rtbl.lua @ 5326:dc058fcc3fe3

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mod_audit: Improve filtering options and add documentation to README
author Matthew Wild <mwild1@gmail.com>
date Fri, 07 Apr 2023 13:44:18 +0100
parents 8cfbcbc0fb89
children f6577cdb1d91
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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 purge = function()
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43 module:log("debug", "Purge all hashes");
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44 for hash in pairs(banned_hashes) do
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45 banned_hashes[hash] = nil;
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46 end
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47 end;
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48 });
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49
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50 function request_list()
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51 local items_request = st.iq({ to = rtbl_service_jid, from = module.host, type = "get", id = "rtbl-request" })
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52 :tag("pubsub", { xmlns = "http://jabber.org/protocol/pubsub" })
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53 :tag("items", { node = rtbl_node }):up()
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54 :up();
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55
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56 module:send(items_request);
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57 end
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58
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59 function update_list(event)
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60 local from_jid = event.stanza.attr.from;
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61 if from_jid ~= rtbl_service_jid then
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62 module:log("debug", "Ignoring RTBL response from unknown sender");
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63 return;
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64 end
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65 local items_el = event.stanza:find("{http://jabber.org/protocol/pubsub}pubsub/items");
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66 if not items_el then
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67 module:log("warn", "Invalid items response from RTBL service");
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68 return;
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69 end
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70
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71 local old_entries = set.new(array.collect(it.keys(banned_hashes)));
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72
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73 local n_added, n_removed, n_total = 0, 0, 0;
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74 for item in items_el:childtags("item") do
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75 local hash = item.attr.id;
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76 if hash then
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77 n_total = n_total + 1;
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78 if not old_entries:contains(hash) then
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79 -- New entry
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80 n_added = n_added + 1;
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81 banned_hashes[hash] = true;
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82 else
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83 -- Entry already existed
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84 old_entries:remove(hash);
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85 end
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86 end
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87 end
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88
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89 -- Remove old entries that weren't in the received list
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90 for hash in old_entries do
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91 n_removed = n_removed + 1;
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92 banned_hashes[hash] = nil;
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93 end
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94
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95 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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96 return true;
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97 end
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98
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99 module:hook("iq-result/host/rtbl-request", update_list);
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100
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101 function update_hashes(occupant)
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102 local bare_hash, host_hash;
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103 if not occupant.mod_muc_rtbl_bare_hash then
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104 bare_hash = sha256(jid.bare(occupant.bare_jid), true);
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105 occupant.mod_muc_rtbl_bare_hash = bare_hash;
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106 else
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107 bare_hash = occupant.mod_muc_rtbl_bare_hash;
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108 end
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109 if not occupant.mod_muc_rtbl_host_hash then
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110 host_hash = sha256(jid.host(occupant.bare_jid), true);
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111 occupant.mod_muc_rtbl_host_hash = host_hash;
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112 else
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113 host_hash = occupant.mod_muc_rtbl_host_hash;
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114 end
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115 return bare_hash, host_hash
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116 end
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117
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118 module:hook("muc-occupant-pre-join", function (event)
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119 if next(banned_hashes) == nil then return end
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120
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121 local from_bare = jid.bare(event.stanza.attr.from);
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122
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123 local affiliation = event.room:get_affiliation(from_bare);
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124 if affiliation and affiliation ~= "none" then
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125 -- Skip check for affiliated users
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126 return;
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127 end
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128
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129 local bare_hash, host_hash = update_hashes(event.occupant);
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130 if banned_hashes[bare_hash] or banned_hashes[host_hash] then
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131 module:log("info", "Blocked user <%s> from room <%s> due to RTBL match", from_bare, event.stanza.attr.to);
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132 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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133 event.origin.send(error_reply);
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134 return true;
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135 end
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136 end);
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137
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138 module:hook("muc-occupant-groupchat", function(event)
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139 local affiliation = event.room:get_affiliation(event.occupant.bare_jid);
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140 if affiliation and affiliation ~= "none" then
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141 -- Skip check for affiliated users
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142 return;
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143 end
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144
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145 local bare_hash, host_hash = update_hashes(event.occupant);
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146 if banned_hashes[bare_hash] or banned_hashes[host_hash] then
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147 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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148 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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149 event.origin.send(error_reply);
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150 return true;
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151 end
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152 end);
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153
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154 module:hook("muc-private-message", function(event)
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155 local occupant = event.room:get_occupant_by_nick(event.stanza.attr.from);
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156 local affiliation = event.room:get_affiliation(event.occupant.bare_jid);
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157 if affiliation and affiliation ~= "none" then
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158 -- Skip check for affiliated users
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159 return;
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160 end
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parents: 5175
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161
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162 local bare_hash, host_hash = update_hashes(occupant);
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163 if banned_hashes[bare_hash] or banned_hashes[host_hash] then
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parents: 4813
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164 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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165 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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166 event.origin.send(error_reply);
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167 return true;
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parents: 4813
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168 end
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parents: 4813
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169 end);
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170
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171 if prosody.start_time then
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parents: 4807
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172 request_list();
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173 else
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parents: 4808
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174 module:hook_global("server-started", function ()
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parents: 4808
diff changeset
175 request_list();
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parents: 4808
diff changeset
176 end);
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177 end