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annotate mod_muc_limits/README.markdown @ 5401:c8d04ac200fc

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mod_http_oauth2: Reject loopback URIs as client_uri This really should be a proper website with info, https://localhost is not good enough. Ideally we'd validate that it's got proper DNS and is actually reachable, but triggering HTTP or even DNS lookups seems like it would carry abuse potential that would best to avoid.
author Kim Alvefur <zash@zash.se>
date Tue, 02 May 2023 16:20:55 +0200
parents 1534d0715d35
children b97ae1cd7813
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1 ---
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2 labels:
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3 - 'Stage-Beta'
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4 summary: 'Impose rate-limits on a MUC'
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5 ...
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7 Introduction
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8 ============
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9
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10 This module allows you to control the maximum rate of 'events' in a MUC
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11 room. This makes it useful to prevent room floods (whether malicious or
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12 accidental).
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14 Details
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15 =======
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16
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17 This module limits the following events:
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18
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19 - Room joins
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20 - Nick changes
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21 - Status changes
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22 - Messages (including private messages)
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23
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24 The limit is for the room as a whole, not individual occupants in the
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25 room. Users with an affiliation (members, admins and owners) are not
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26 limited.
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27
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28 Configuration
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29 =============
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30
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31 Add the module to the MUC host (not the global modules\_enabled):
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32
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33 Component "conference.example.com" "muc"
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34 modules_enabled = { "muc_limits" }
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35
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36 You can define (globally or per-MUC component) the following options:
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37
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38 Name Default value Description
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39 ------------------------ --------------- ----------------------------------------------
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40 muc\_event\_rate 0.5 The maximum number of events per second.
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41 muc\_burst\_factor 6 Allow temporary bursts of this multiple.
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42 muc\_max\_nick\_length 23 The maximum allowed length of user nicknames
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43
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44 For more understanding of how these values are used, see the algorithm
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45 section below.
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46
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47 Algorithm
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48 =========
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49
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50 A certain number of events are allowed per second, given by
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51 muc\_event\_rate. An event rate of 1 allows one event per second, and
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52 event rate of 3 allows three events per second, and 0.5 allows one event
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53 every two seconds, and so on.
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55 Obviously MUC conversations are not exactly steady streams of events.
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56 Sometimes multiple people will talk at once. This is handled by the
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57 muc\_burst\_factor option.
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59 A burst factor of 2 will allow 2 times as many events at once, for 2
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60 seconds, before throttling will be triggered. A factor of 5, 5 times as
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61 many events for 5 seconds.
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62
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63 When the limit is reached, an error response will be generated telling
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64 the user the MUC is overactive, and asking them to try again.
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65
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66 Compatibility
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67 =============
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69 ------- ------------------
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70 trunk Works
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71 0.11 Works
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72 0.10 Works
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73 0.9 Works
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74 0.8 Doesn't work[^1]
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75 ------- ------------------
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76
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77 [^1]: This module can be made to work in 0.8 (and *maybe* previous
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78 versions) of Prosody by copying the new
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79 [util.throttle](http://hg.prosody.im/trunk/raw-file/fc8a22936b3c/util/throttle.lua)
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80 into your Prosody source directory (into the util/ subdirectory).