annotate mod_s2s_idle_timeout/mod_s2s_idle_timeout.lua @ 5298:12f7d8b901e0

mod_audit: Support for adding location (GeoIP) to audit events This can be more privacy-friendly than logging full IP addresses, and also more informative to a user - IP addresses don't mean much to the average person, however if they see activity from outside their expected country, they can immediately identify suspicious activity. As with IPs, this field is configurable for deployments that would like to disable it. Location is also not logged when the geoip library is not available.
author Matthew Wild <mwild1@gmail.com>
date Sat, 01 Apr 2023 13:11:53 +0100
parents 4e235e565693
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1 local now = os.time;
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3 local s2smanager = require "core.s2smanager";
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4 local timer = require "util.timer";
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6 local s2s_sessions = setmetatable({}, { __mode = "kv" });
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8 local idle_timeout = module:get_option("s2s_idle_timeout") or 300;
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9 local check_interval = math.ceil(idle_timeout * 0.75);
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11 local function install_checks(session)
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12 if not session.last_received_time then
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13 session.last_received_time = now();
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14 if session.direction == "incoming" then
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15 local _data = session.data;
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16 function session.data(conn, data)
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17 session.last_received_time = now();
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18 return _data(conn, data);
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19 end
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20 else
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21 local _sends2s = session.sends2s;
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22 function session.sends2s(data)
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23 session.last_received_time = now();
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24 return _sends2s(data);
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25 end
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26 end
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27 s2s_sessions[session] = true;
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28 end
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29 end
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30
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31 module:hook("s2s-authenticated", function (event)
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32 install_checks(event.session);
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33 end);
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35 function check_idle_sessions(time)
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36 time = time or now();
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37 for session in pairs(s2s_sessions) do
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38 local last_received_time = session.last_received_time;
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39 if last_received_time and time - last_received_time > idle_timeout then
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40 module:log("debug", "Closing idle connection %s->%s",
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41 session.from_host or "(unknown)", session.to_host or "(unknown)");
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42 session:close(); -- Close-on-idle isn't an error
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43 s2s_sessions[session] = nil;
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44 end
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45 end
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46 return check_interval;
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47 end
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48 timer.add_task(check_interval, check_idle_sessions);
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50 function module.save()
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51 return { s2s_sessions = s2s_sessions };
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52 end
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54 function module.restore(data)
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55 s2s_sessions = setmetatable(data.s2s_sessions or {}, { __mode = "kv" });
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56 end