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annotate mod_muc_limits/README.markdown @ 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 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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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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68
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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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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).