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annotate mod_throttle_unsolicited/mod_throttle_unsolicited.lua @ 2324:1424aa8877f0

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mod_throttle_unsolicited: Add support for throttling unsolicited messages on incoming s2s connections
author Kim Alvefur <zash@zash.se>
date Tue, 04 Oct 2016 16:18:06 +0200
parents 7cab309a26b2
children 231d47e61c81
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1 local st = require"util.stanza";
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2 local jid_split = require "util.jid".split;
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3 local jid_bare = require "util.jid".bare;
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4 local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed;
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5 local throttle = require "util.throttle";
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6 local gettime = require "socket".gettime;
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7
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8 local max = module:get_option_number("unsolicited_messages_per_minute", 10);
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9 local s2s_max = module:get_option_number("unsolicited_s2s_messages_per_minute");
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10 local multiplier = module:get_option_number("throttle_unsolicited_burst", 1);
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11
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12 function check_subscribed(event)
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13 local stanza, origin = event.stanza, event.origin;
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14 local log = origin.log or module._log;
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15 log("debug", "check_subscribed(%s)", stanza:top_tag());
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16 if stanza.attr.type == "error" then return end
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17
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18 local to_orig = stanza.attr.to;
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19 if to_orig == nil or to_orig == origin.full_jid then return end -- to self
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20
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21 local to_bare = jid_bare(to_orig);
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22 local from_jid = jid_bare(stanza.attr.from);
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23 if to_bare == from_jid then return end -- to own resource
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24
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25 -- Check if it's a message to a joined room
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26 local rooms = origin.rooms_joined;
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27 if rooms and rooms[to_bare] then
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28 log("debug", "Message to joined room, no limit");
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29 return
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30 end
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31
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32 -- Retrieve or create throttle object
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33 local lim = origin.throttle_unsolicited;
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34 if not lim then
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35 log("debug", "New throttle");
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36 lim = throttle.create(max * multiplier, 60 * multiplier);
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37 origin.throttle_unsolicited = lim;
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38 end
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39
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40 local to_user, to_host = jid_split(to_orig);
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41 if to_user and not is_contact_subscribed(to_user, to_host, from_jid) then
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42 log("debug", "%s is not subscribed to %s@%s", from_jid, to_user, to_host);
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43 if not lim:poll(1) then
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44 log("warn", "Sent too many messages to non-contacts, bouncing message");
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45 event.origin.firewall_mark_throttle_unsolicited = gettime();
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46 event.origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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47 return true;
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48 end
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49 end
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50 end
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51
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52 module:hook("pre-message/bare", check_subscribed, 200);
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53 module:hook("pre-message/full", check_subscribed, 200);
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54
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55 local full_sessions = prosody.full_sessions;
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56
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57 -- Rooms and throttle creation will differ for s2s
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58 function check_subscribed_s2s(event)
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59 local stanza, origin = event.stanza, event.origin;
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60 local log = origin.log or module._log;
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61
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62 if origin.type ~= "s2sin" then return end
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63
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64 local to_orig = stanza.attr.to;
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65 local from_orig = stanza.attr.from;
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66 local from_bare = jid_bare(from_orig);
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67
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68 local target = full_sessions[to_orig];
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69 if target then
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70 local rooms = target.rooms_joined;
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71 if rooms and rooms[from_bare] then
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72 log("debug", "Message to joined room, no limit");
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73 return
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74 end
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75 end
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76
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77 -- Retrieve or create throttle object
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78 local lim = origin.throttle_unsolicited;
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79 if not lim then
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80 log("debug", "New s2s throttle");
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81 lim = throttle.create(s2s_max * multiplier, 60 * multiplier);
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82 origin.throttle_unsolicited = lim;
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83 end
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84
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85 return check_subscribed(event);
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86 end
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87
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88 if s2s_max then
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89 module:hook("message/bare", check_subscribed_s2s, 200);
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90 module:hook("message/full", check_subscribed_s2s, 200);
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91 end
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92
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93 module:depends("track_muc_joins");