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annotate mod_limit_auth/mod_limit_auth.lua @ 4432:e83284d4d5c2

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mod_auth_ccert/README: Add setting to ensure Prosdy asks for client certificate This used to be the default for all services, but since it triggers annoying popups in web browsers it was inverted in Prosody and only s2s enables it, so it needs to be explicitly enabled for c2s again. See trunk 115b5e32d960 Thanks debacle
author Kim Alvefur <zash@zash.se>
date Sat, 06 Feb 2021 21:34:25 +0100
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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45
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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