Mercurial > prosody-modules

annotate mod_muc_limits/mod_muc_limits.lua @ 5787:e79f9dec35c0

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mod_c2s_conn_throttle: Reduce log level from error->info Our general policy is that "error" should never be triggerable by remote entities, and that it is always about something that requires admin intervention. This satisfies neither condition. The "warn" level can be used for unexpected events/behaviour triggered by remote entities, and this could qualify. However I don't think failed auth attempts are unexpected enough. I selected "info" because it is what is also used for other notable session lifecycle events.
author Matthew Wild <mwild1@gmail.com>
date Thu, 07 Dec 2023 15:46:50 +0000
parents 6680a1f53353
children
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rev   line source
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0b41122b19f9 mod_muc_limits: Abort loading on non-MUC hosts (thanks Ge0rG)
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parents: 1042
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1
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163967467308 mod_muc_limits: Update to work with both the new and the old MUC API
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2 local mod_muc = module:depends"muc";
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3 local rooms = rawget(mod_muc, "rooms"); -- Old MUC API
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4
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5 local jid_split, jid_bare = require "util.jid".split, require "util.jid".bare;
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6 local st = require "util.stanza";
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7 local new_throttle = require "util.throttle".create;
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8 local t_insert, t_concat = table.insert, table.concat;
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9
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10 local xmlns_muc = "http://jabber.org/protocol/muc";
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11
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12 local period = math.max(module:get_option_number("muc_event_rate", 0.5), 0);
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13 local burst = math.max(module:get_option_number("muc_burst_factor", 6), 1);
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14
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a44e755f7579 mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
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15 local max_nick_length = module:get_option_number("muc_max_nick_length", 23); -- Default chosen through scientific methods
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f71d66bd87be mod_muc_limits: Add a limit on number of lines per message
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16 local max_line_count = module:get_option_number("muc_max_line_count", 23); -- Default chosen through s/scientific methods/copy and paste/
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17 local max_char_count = module:get_option_number("muc_max_char_count", 5664); -- Default chosen by multiplying a number by 23
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18 local base_cost = math.max(module:get_option_number("muc_limit_base_cost", 1), 0);
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19 local line_multiplier = math.max(module:get_option_number("muc_line_count_multiplier", 0.1), 0);
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20
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21 local join_only = module:get_option_boolean("muc_limit_joins_only", false);
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22 local dropped_count = 0;
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23 local dropped_jids;
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24
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25 local function log_dropped()
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26 module:log("warn", "Dropped %d stanzas from %d JIDs: %s", dropped_count, #dropped_jids, t_concat(dropped_jids, ", "));
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27 dropped_count = 0;
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28 dropped_jids = nil;
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29 end
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30
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31 local function handle_stanza(event)
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32 local origin, stanza = event.origin, event.stanza;
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2356ad05fdb6 mod_muc_limits: Don't limit room leaving
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33 if stanza.name == "presence" and stanza.attr.type == "unavailable" then -- Don't limit room leaving
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34 return;
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35 end
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36 local dest_room, dest_host, dest_nick = jid_split(stanza.attr.to);
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37 local room = event.room or rooms[dest_room.."@"..dest_host];
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38 if not room then return; end
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39 local from_jid = stanza.attr.from;
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9be9dd434813 mod_muc_limits: Simplify bypass for affiliated users
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parents: 3417
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40 if room:get_affiliation(jid_bare(from_jid)) then
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41 module:log("debug", "Skipping stanza from affiliated user...");
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42 return;
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1255de347dd4 mod_muc_limits: Fix traceback on presence sent to the room's bare JID
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43 elseif dest_nick and max_nick_length and stanza.name == "presence" and not room._occupants[stanza.attr.to] and #dest_nick > max_nick_length then
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parents: 1035
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44 module:log("debug", "Forbidding long (%d bytes) nick in %s", #dest_nick, dest_room)
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45 origin.send(st.error_reply(stanza, "modify", "policy-violation", "Your nick name is too long, please use a shorter one")
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46 :up():tag("x", { xmlns = xmlns_muc }));
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47 return true;
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48 end
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49 local throttle = room.throttle;
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50 if not room.throttle then
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51 throttle = new_throttle(period*burst, burst);
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52 room.throttle = throttle;
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53 end
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54 local cost = base_cost;
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55 local body = stanza:get_child_text("body");
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56 if body then
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57 -- TODO calculate a text diagonal cross-section or some mathemagical
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58 -- number, maybe some cost multipliers
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59 if #body > max_char_count then
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60 origin.send(st.error_reply(stanza, "modify", "policy-violation", "Your message is too long, please write a shorter one")
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61 :up():tag("x", { xmlns = xmlns_muc }));
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62 return true;
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63 end
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64 local body_lines = select(2, body:gsub("\n[^\n]*", ""));
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65 if body_lines > max_line_count then
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66 origin.send(st.error_reply(stanza, "modify", "policy-violation", "Your message is too long, please write a shorter one"):up()
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67 :tag("x", { xmlns = xmlns_muc; }));
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68 return true;
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69 end
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70 cost = cost + (body_lines * line_multiplier);
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71 end
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72 if not throttle:poll(cost) then
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73 module:log("debug", "Dropping stanza for %s@%s from %s, over rate limit", dest_room, dest_host, from_jid);
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74 if not dropped_jids then
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75 dropped_jids = { [from_jid] = true, from_jid };
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76 module:add_timer(5, log_dropped);
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77 elseif not dropped_jids[from_jid] then
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78 dropped_jids[from_jid] = true;
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79 t_insert(dropped_jids, from_jid);
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80 end
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81 dropped_count = dropped_count + 1;
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82 if stanza.attr.type == "error" then -- We don't want to bounce errors
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83 return true;
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84 end
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85 local reply = st.error_reply(stanza, "wait", "policy-violation", "The room is currently overactive, please try again later");
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86 if body then
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87 reply:up():tag("body"):text(body):up();
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88 end
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89 local x = stanza:get_child("x", xmlns_muc);
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90 if x then
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91 reply:add_child(st.clone(x));
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92 end
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93 origin.send(reply);
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94 return true;
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95 end
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96 end
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97
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98 if rooms then
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99 function module.unload()
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100 for room_jid, room in pairs(rooms) do --luacheck: ignore 213/room_jid
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101 room.throttle = nil;
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102 end
556
e50bdbaa7802 mod_muc_limits: Remove throttle object from all rooms on unload (to make sure new settings are applied on reload)
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103 end
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104
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105 module:hook("presence/full", handle_stanza, 501);
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106 if not join_only then
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107 module:hook("message/bare", handle_stanza, 501);
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108 module:hook("message/full", handle_stanza, 501);
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109 module:hook("presence/bare", handle_stanza, 501);
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110 end
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Kim Alvefur <zash@zash.se>
parents: 3402
diff changeset
111 else
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Kim Alvefur <zash@zash.se>
parents: 3402
diff changeset
112 module:hook("muc-occupant-pre-join", handle_stanza);
3965
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Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
113 if not join_only then
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Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
114 module:hook("muc-occupant-pre-change", handle_stanza);
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Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
115 module:hook("muc-occupant-groupchat", handle_stanza);
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Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
116 end
3417
1534d0715d35 mod_muc_limits: Add support for new MUC API in Prosody 0.11
Kim Alvefur <zash@zash.se>
parents: 3402
diff changeset
117 end