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mod_rest/README: Describe Ad-Hoc command mapping
author Kim Alvefur <zash@zash.se>
date Sat, 08 Feb 2020 15:29:35 +0100
parents f84ede3e9e3b
children 8e58a1b78336
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1 ---
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2 labels:
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3 - 'Stage-Deprecated'
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4 - 'Type-Auth'
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5 summary: 'Authentication via external script/process (DEPRECATED)'
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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 **Warning:** This module is not currently maintained, and may be buggy and insecure in
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14 certain configurations/environments. It is **not** recommended for production use. Please
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15 use one of the [many other authentication modules](/type_auth).
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16
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17 Installation
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18 ============
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19
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20 mod\_auth\_external\_insecure depends on a Lua module called
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21 [lpty](http://www.tset.de/lpty/). You can install it on many platforms
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22 using [LuaRocks](http://luarocks.org/), for example:
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23
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24 sudo luarocks install lpty
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25
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26 Configuration
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27 =============
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28
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29 As with all auth modules, there is no need to add this to
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30 modules\_enabled. Simply add in the global section, or for the relevant
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31 hosts:
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32
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33 authentication = "external_insecure"
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34
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35 These options are specific to mod\_auth\_external\_insecure:
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37 -------------------------- -------------------------------------------------------------------------------------------------------------------------
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38 external\_auth\_protocol May be "generic" or "ejabberd" (the latter for compatibility with ejabberd external auth scripts. Default is "generic".
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39 external\_auth\_command The command/script to execute.
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40 -------------------------- -------------------------------------------------------------------------------------------------------------------------
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41
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42 Two other options are also available, depending on whether the module is
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43 running in 'blocking' or 'non-blocking' mode:
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45 --------------------------- -------------- ------------------------------------------------------------------------------------------------------------------
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46 external\_auth\_timeout blocking The number of seconds to wait for a response from the auth process. Default is 5.
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47 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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48 --------------------------- -------------- ------------------------------------------------------------------------------------------------------------------
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49
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50 Blocking vs non-blocking
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51 ------------------------
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52
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53 Non-blocking mode is experimental and is disabled by default.
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54
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55 Enable at your own risk if you fulfil these conditions:
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56
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57 - Running Prosody trunk ([nightly](http://prosody.im/nightly/) build
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58 414+) or Prosody 0.11.x.
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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 ```lua
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64 external_auth_blocking = false;
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65 ```
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66
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67 Protocol
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68 ========
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69
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70 Prosody executes the given command/script, and sends it queries.
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71
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72 Your auth script should simply read a line from standard input, and
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73 write the result to standard output. It must do this in a loop, until
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74 there's nothing left to read. Prosody can keep sending more lines to the
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75 script, with a command on each line.
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76
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77 Each command is one line, and the response is expected to be a single
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78 line containing "0" for failure or "1" for success. Your script must
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79 respond with "0" for anything it doesn't understand.
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80
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81 There are three commands used at the moment:
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82
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83 auth
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84 ----
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85
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86 Check if a user's password is valid.
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87
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88 Example: `auth:username:example.com:abc123`
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89
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90 Note: The password can contain colons. Make sure to handle that.
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91
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92 isuser
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93 ------
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94
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95 Check if a user exists.
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96
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97 Example: `isuser:username:example.com`
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98
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99 setpass
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100 -------
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101
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102 Set a new password for the user. Implementing this is optional.
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103
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104 Example: `setpass:username:example.com:abc123`
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105
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106 Note: The password can contain colons. Make sure to handle that.
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107
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108 ejabberd compatibility
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109 ---------------------
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110
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111 ejabberd implements a similar protocol. The main difference is that
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112 Prosody's protocol is line-based, while ejabberd's is length-prefixed.
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113
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114 Add this to your config if you need to use an ejabberd auth script:
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115
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116 external_auth_protocol = "ejabberd"
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117
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118 Compatibility
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119 =============
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120
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121 ----- -------
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122 0.8 Works
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123 0.9 Works
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124 ----- -------