prosody-modules
6680a1f53353
mod_restrict_xmpp/mod_restrict_xmpp.lua

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mod_restrict_xmpp/mod_restrict_xmpp.lua @ 5608:6680a1f53353

mod_muc_limits: Reduce cost of multi-line messages, make configurable Typing a 5-line message preceded by a few chat states would have hit the default limit.
author Kim Alvefur <zash@zash.se>
date Sat, 15 Jul 2023 09:09:41 +0200
parent 5582:825c6fb76c48
child 5770:111e970213a0
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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 set = require "util.set";
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4 local st = require "util.stanza";
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5
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6 local normal_user_role = "prosody:registered";
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7 local limited_user_role = "prosody:guest";
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8
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9 local features = require "core.features";
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10
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11 -- COMPAT
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12 if not features.available:contains("split-user-roles") then
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13 normal_user_role = "prosody:user";
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14 limited_user_role = "prosody:restricted";
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15 end
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16
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17 module:default_permission(normal_user_role, "xmpp:federate");
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18 module:hook("route/remote", function (event)
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19 if not module:may("xmpp:federate", event) then
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20 if event.stanza.attr.type ~= "result" and event.stanza.attr.type ~= "error" then
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21 module:log("warn", "Access denied: xmpp:federate for %s -> %s", event.stanza.attr.from, event.stanza.attr.to);
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22 local reply = st.error_reply(event.stanza, "auth", "forbidden");
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23 event.origin.send(reply);
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24 end
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25 return true;
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26 end
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27 end);
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28
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29 local iq_namespaces = {
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30 ["jabber:iq:roster"] = "contacts";
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31 ["jabber:iq:private"] = "storage";
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32
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33 ["vcard-temp"] = "profile";
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34 ["urn:xmpp:mam:0"] = "history";
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35 ["urn:xmpp:mam:1"] = "history";
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36 ["urn:xmpp:mam:2"] = "history";
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37
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38 ["urn:xmpp:carbons:0"] = "carbons";
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39 ["urn:xmpp:carbons:1"] = "carbons";
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40 ["urn:xmpp:carbons:2"] = "carbons";
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41
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42 ["urn:xmpp:blocking"] = "blocklist";
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43
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44 ["http://jabber.org/protocol/pubsub"] = "pep";
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45 ["http://jabber.org/protocol/disco#info"] = "disco";
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46 };
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47
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48 local legacy_storage_nodes = {
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49 ["storage:bookmarks"] = "bookmarks";
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50 ["storage:rosternotes"] = "contacts";
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51 ["roster:delimiter"] = "contacts";
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52 ["storage:metacontacts"] = "contacts";
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53 };
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54
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55 local pep_nodes = {
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56 ["storage:bookmarks"] = "bookmarks";
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57 ["urn:xmpp:bookmarks:1"] = "bookmarks";
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58
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59 ["urn:xmpp:avatar:data"] = "profile";
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60 ["urn:xmpp:avatar:metadata"] = "profile";
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61 ["http://jabber.org/protocol/nick"] = "profile";
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62
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63 ["eu.siacs.conversations.axolotl.devicelist"] = "omemo";
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64 ["urn:xmpp:omemo:1:devices"] = "omemo";
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65 ["urn:xmpp:omemo:1:bundles"] = "omemo";
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66 ["urn:xmpp:omemo:2:devices"] = "omemo";
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67 ["urn:xmpp:omemo:2:bundles"] = "omemo";
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68 };
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69
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70 module:hook("pre-iq/bare", function (event)
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71 if not event.to_self then return; end
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72 local origin, stanza = event.origin, event.stanza;
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73
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74 local typ = stanza.attr.type;
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75 if typ ~= "set" and typ ~= "get" then return; end
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76 local action = typ == "get" and "read" or "write";
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77
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78 local payload = stanza.tags[1];
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79 local ns = payload and payload.attr.xmlns;
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80 local proto = iq_namespaces[ns];
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81 if proto == "pep" then
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82 local pubsub = payload:get_child("pubsub", "http://jabber.org/protocol/pubsub");
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83 local node = pubsub and #pubsub.tags == 1 and pubsub.tags[1].attr.node or nil;
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84 proto = pep_nodes[node] or "pep";
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85 if proto == "pep" and node and node:match("^eu%.siacs%.conversations%.axolotl%.bundles%.%d+$") then
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86 proto = "omemo"; -- COMPAT w/ original OMEMO
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87 end
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88 elseif proto == "storage" then
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89 local data = payload.tags[1];
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90 proto = data and legacy_storage_nodes[data.attr.xmlns] or "legacy-storage";
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91 elseif proto == "carbons" then
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92 -- This allows access to live messages
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93 proto, action = "messages", "read";
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94 elseif proto == "history" then
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95 action = "read";
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96 end
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97 local permission_name = "xmpp:account:"..(proto and (proto..":") or "")..action;
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98 if not module:may(permission_name, event) then
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99 module:log("warn", "Access denied: %s ({%s}%s) for %s", permission_name, ns, payload.name, origin.full_jid or origin.id);
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100 origin.send(st.error_reply(stanza, "auth", "forbidden", "You do not have permission to make this request ("..permission_name..")"));
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101 return true;
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102 end
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103 end);
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104
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105 --module:default_permission("prosody:restricted", "xmpp:account:read");
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106 --module:default_permission("prosody:restricted", "xmpp:account:write");
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107 module:default_permission(limited_user_role, "xmpp:account:messages:read");
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108 module:default_permission(limited_user_role, "xmpp:account:messages:write");
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109 for _, property_list in ipairs({ iq_namespaces, legacy_storage_nodes, pep_nodes }) do
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110 for account_property in set.new(array.collect(it.values(property_list))) do
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111 module:default_permission(limited_user_role, "xmpp:account:"..account_property..":read");
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112 module:default_permission(limited_user_role, "xmpp:account:"..account_property..":write");
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113 end
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114 end
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115
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116 module:default_permission("prosody:restricted", "xmpp:account:presence:write");
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117 module:hook("pre-presence/bare", function (event)
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118 if not event.to_self then return; end
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119 local stanza = event.stanza;
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120 if not module:may("xmpp:account:presence:write", event) then
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121 module:log("warn", "Access denied: xmpp:account:presence:write for %s", event.origin.full_jid or event.origin.id);
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122 event.origin.send(st.error_reply(stanza, "auth", "forbidden", "You do not have permission to send account presence"));
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123 return true;
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124 end
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125 local priority = stanza:get_child_text("priority");
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126 if priority ~= "-1" then
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127 if not module:may("xmpp:account:messages:read", event) then
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128 module:log("warn", "Access denied: xmpp:account:messages:read for %s", event.origin.full_jid or event.origin.id);
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129 event.origin.send(st.error_reply(stanza, "auth", "forbidden", "You do not have permission to receive messages (use presence priority -1)"));
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130 return true;
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131 end
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132 end
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133 end);