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annotate mod_limit_auth/mod_limit_auth.lua @ 5648:c217f4edfc4f

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misc/mtail: Start of an mtail config Stashing it here in case anyone wants to continue working on it. Currently it's only counting log messages by level. Due to the permissions set by systemd on Prosody logs, mtail never managed to start correctly until permissions were manually relaxed.
author Kim Alvefur <zash@zash.se>
date Sun, 17 Sep 2023 13:36:30 +0200
parents 2a5a44d5b935
children
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c1bb2a64aabb mod_limit_auth: Throttle authentication (failed) attempts with optional (0.10+) tarpit
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1 -- mod_limit_auth
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2
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3 local st = require"util.stanza";
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4 local new_throttle = require "util.throttle".create;
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5
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6 local period = math.max(module:get_option_number(module.name.."_period", 30), 0);
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7 local max = math.max(module:get_option_number(module.name.."_max", 5), 1);
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8
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9 local tarpit_delay = module:get_option_number(module.name.."_tarpit_delay", nil);
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10 if tarpit_delay then
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11 local waiter = require "util.async".waiter;
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12 local delay = tarpit_delay;
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13 function tarpit_delay()
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14 local wait, done = waiter();
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15 module:add_timer(delay, done);
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16 wait();
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17 end
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18 else
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19 function tarpit_delay() end
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20 end
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21
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22 local throttles = module:shared"throttles";
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23
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24 local reply = st.stanza("failure", { xmlns = "urn:ietf:params:xml:ns:xmpp-sasl" }):tag("temporary-auth-failure");
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25
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26 local function get_throttle(ip)
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27 local throttle = throttles[ip];
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28 if not throttle then
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29 throttle = new_throttle(max, period);
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30 throttles[ip] = throttle;
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31 end
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32 return throttle;
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33 end
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34
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35 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function (event)
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36 local origin = event.origin;
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37 if origin.type ~= "c2s_unauthed" then return end
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38 if not get_throttle(origin.ip):peek(1) then
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39 origin.log("warn", "Too many authentication attepmts for ip %s", origin.ip);
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40 tarpit_delay();
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41 origin.send(reply);
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42 return true;
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43 end
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44 end, 10);
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46 module:hook("authentication-failure", function (event)
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47 get_throttle(event.session.ip):poll(1);
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48 end);
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49
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50 module:add_timer(14400, function (now)
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51 local old = now - 86400;
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52 for ip, throttle in pairs(throttles) do
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53 if throttle.t < old then
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54 throttles[ip] = nil;
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55 end
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56 end
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57 end);
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58