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annotate mod_auth_external/README.markdown @ 2624:c110b6bfe5d1

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mod_smacks: Prevent ack loop on misbehaving clients
author tmolitor <thilo@eightysoft.de>
date Wed, 15 Mar 2017 16:24:03 +0100
parents ead81e222fde
children ea6b5321db50
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1 ---
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2 labels:
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3 - 'Stage-Alpha'
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4 - 'Type-Auth'
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5 summary: 'Authentication via external script/process'
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6 ...
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7
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8 Introduction
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9 ============
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10
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11 Allow client authentication to be handled by an external script/process.
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12
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13 Installation
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14 ============
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15
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16 mod\_auth\_external depends on a Lua module called
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17 [lpty](http://www.tset.de/lpty/). You can install it on many platforms
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18 using [LuaRocks](http://luarocks.org/), for example:
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19
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20 sudo luarocks install lpty
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21
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22 Note: Earlier versions of the module did not depend on lpty. While using
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23 the newer version is strongly recommended, you can find the [older
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24 version
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25 here](https://hg.prosody.im/prosody-modules/raw-file/50ee38e95e75/mod_auth_external/mod_auth_external.lua)
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26 if you need it (revision of the repository).
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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 As with all auth modules, there is no need to add this to
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32 modules\_enabled. Simply add in the global section, or for the relevant
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33 hosts:
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34
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35 authentication = "external"
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36
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37 These options are specific to mod\_auth\_external:
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38
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39 -------------------------- -------------------------------------------------------------------------------------------------------------------------
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40 external\_auth\_protocol May be "generic" or "ejabberd" (the latter for compatibility with ejabberd external auth scripts. Default is "generic".
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41 external\_auth\_command The command/script to execute.
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42 -------------------------- -------------------------------------------------------------------------------------------------------------------------
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43
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44 Two other options are also available, depending on whether the module is
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45 running in 'blocking' or 'non-blocking' mode:
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47 --------------------------- -------------- ------------------------------------------------------------------------------------------------------------------
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48 external\_auth\_timeout blocking The number of seconds to wait for a response from the auth process. Default is 5.
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49 external\_auth\_processes non-blocking The number of concurrent processes to spawn. Default is 1, increase to handle high connection rates efficiently.
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50 --------------------------- -------------- ------------------------------------------------------------------------------------------------------------------
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52 Blocking vs non-blocking
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53 ------------------------
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54
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55 Non-blocking mode is automatically activated when:
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57 - Running Prosody trunk ([nightly](http://prosody.im/nightly/) build
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58 414+).
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59 - [libevent](http://prosody.im/doc/libevent) is enabled in the config,
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60 and LuaEvent is available.
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61 - lpty (see installation above) is version 1.0.1 or later.
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62
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63 Protocol
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64 ========
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65
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66 Prosody executes the given command/script, and sends it queries.
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67
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68 Your auth script should simply read a line from standard input, and
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69 write the result to standard output. It must do this in a loop, until
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70 there's nothing left to read. Prosody can keep sending more lines to the
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71 script, with a command on each line.
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72
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73 Each command is one line, and the response is expected to be a single
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74 line containing "0" for failure or "1" for success. Your script must
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75 respond with "0" for anything it doesn't understand.
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76
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77 There are three commands used at the moment:
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78
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79 auth
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80 ----
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81
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82 Check if a user's password is valid.
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83
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84 Example: `auth:username:example.com:abc123`
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85
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86 Note: The password can contain colons. Make sure to handle that.
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87
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88 isuser
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89 ------
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90
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91 Check if a user exists.
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92
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93 Example: `isuser:username:example.com`
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94
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95 setpass
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96 -------
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97
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98 Set a new password for the user. Implementing this is optional.
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99
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100 Example: `setpass:username:example.com:abc123`
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101
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102 Note: The password can contain colons. Make sure to handle that.
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103
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104 ejabberd compatibilty
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105 ---------------------
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106
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107 ejabberd implements a similar protocol. The main difference is that
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108 Prosody's protocol is line-based, while ejabberd's is length-prefixed.
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109
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110 Add this to your config if you need to use an ejabberd auth script:
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111
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112 external_auth_protocol = "ejabberd"
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113
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114 Compatibility
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115 =============
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116
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117 ----- -------
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118 0.8 Works
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119 0.9 Works
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120 ----- -------