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mod_compression: Rename to mod_compression_unsafe and add security note
author Matthew Wild <mwild1@gmail.com>
date Tue, 26 Sep 2017 14:08:39 +0100
parents mod_compression/README.markdown@a5d4a78c7619
children 4b7e6c01aa1c
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1 **NOTE:** XMPP compression has unresolved [security concerns](https://mail.jabber.org/pipermail/standards/2014-October/029215.html),
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2 and this module has been removed from Prosody and renamed.
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3
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4 While the bandwidth usage of XMPP isn't that much, compressing the data
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5 sent to/from your server can give significant benefits to those on slow
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6 connections, such as dial-up or mobile networks. Prosody supports
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7 compression for client-to-server (if your client supports it) and
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8 server-to-server streams using the mod\_compression plugin.
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9
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10 # Details
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11
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12 mod\_compression implements [XEP-0138], and supports the zlib compression
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13 algorithm.
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14
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15 ## Dependencies
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16
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17 The XMPP protocol specifies that all clients and servers supporting
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18 compression must support the "zlib" compression method, and this is what
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19 Prosody uses. However you will need to install zlib support for Lua on
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20 your system. There are different ways of doing this depending on your
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21 system. If in doubt whether it is installed correctly, the command
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22 `lua -lzlib` in a console should open a Lua prompt with no errors.
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24 Debian/Ubuntu
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25 : `apt-get install lua-zlib`
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27 LuaRocks
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28 : `luarocks install lua-zlib`
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30 Source
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31 : <https://github.com/brimworks/lua-zlib>
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32
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33 # Usage
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34
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35 ``` lua
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36 modules_enabled = {
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37 -- Other modules
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38 "compression"; -- Enable mod_compression
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39 }
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40 ```
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41
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42 ## Configuration
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43
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44 The compression level can be set using the `compression_level` option
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45 which can be a number from 1 to 9. Higher compression levels will use
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46 more resources but less bandwidth.
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47
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48 ## Example
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49
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50 ``` lua
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51 modules_enabled = {
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52 -- Other modules
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53 "compression"; -- Enable mod_compression
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54 }
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55  
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56 compression_level = 5
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57 ```