annotate mod_muc_rtbl/mod_muc_rtbl.lua @ 5185:09d6bbd6c8a4

mod_http_oauth2: Fix treatment of 'redirect_uri' parameter in code flow It's optional and the one stored in the client registration should really be used instead. RFC 6749 says an URI provided as parameter MUST be validated against the stored one but does not say how. Given that the client needs their secret to proceed, it seems fine to leave this for later.
author Kim Alvefur <zash@zash.se>
date Thu, 02 Mar 2023 22:00:42 +0100
parents f6b5f04d4b28
children 8cfbcbc0fb89
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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 local bare_hash, host_hash;
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96 if not occupant.mod_muc_rtbl_bare_hash then
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97 bare_hash = sha256(jid.bare(occupant.bare_jid), true);
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98 occupant.mod_muc_rtbl_bare_hash = bare_hash;
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99 else
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100 bare_hash = occupant.mod_muc_rtbl_bare_hash;
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101 end
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102 if not occupant.mod_muc_rtbl_host_hash then
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103 host_hash = sha256(jid.host(occupant.bare_jid), true);
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104 occupant.mod_muc_rtbl_host_hash = host_hash;
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105 else
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106 host_hash = occupant.mod_muc_rtbl_host_hash;
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107 end
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108 return bare_hash, host_hash
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109 end
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110
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111 module:hook("muc-occupant-pre-join", function (event)
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112 if next(banned_hashes) == nil then return end
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113
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114 local from_bare = jid.bare(event.stanza.attr.from);
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115
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116 local affiliation = event.room:get_affiliation(from_bare);
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117 if affiliation and affiliation ~= "none" then
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118 -- Skip check for affiliated users
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119 return;
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120 end
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121
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122 local bare_hash, host_hash = update_hashes(event.occupant);
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123 if banned_hashes[bare_hash] or banned_hashes[host_hash] then
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124 module:log("info", "Blocked user <%s> from room <%s> due to RTBL match", from_bare, event.stanza.attr.to);
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125 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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126 event.origin.send(error_reply);
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127 return true;
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128 end
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129 end);
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130
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131 module:hook("muc-occupant-groupchat", function(event)
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132 local affiliation = event.room:get_affiliation(event.occupant.bare_jid);
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133 if affiliation and affiliation ~= "none" then
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134 -- Skip check for affiliated users
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135 return;
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136 end
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137
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138 local bare_hash, host_hash = update_hashes(event.occupant);
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139 if banned_hashes[bare_hash] or banned_hashes[host_hash] then
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140 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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141 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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142 event.origin.send(error_reply);
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143 return true;
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144 end
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145 end);
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146
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147 module:hook("muc-private-message", function(event)
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148 local occupant = event.room:get_occupant_by_nick(event.stanza.attr.from);
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149 local affiliation = event.room:get_affiliation(event.occupant.bare_jid);
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150 if affiliation and affiliation ~= "none" then
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151 -- Skip check for affiliated users
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152 return;
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153 end
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154
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155 local bare_hash, host_hash = update_hashes(occupant);
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156 if banned_hashes[bare_hash] or banned_hashes[host_hash] then
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157 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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158 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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159 event.origin.send(error_reply);
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160 return true;
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161 end
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162 end);
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163
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164 if prosody.start_time then
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165 request_list();
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166 else
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167 module:hook_global("server-started", function ()
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168 request_list();
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169 end);
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170 end