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+++ b/mod_auth_external/README.markdown	Fri Aug 28 18:03:58 2015 +0200
@@ -0,0 +1,120 @@
+---
+labels:
+- 'Stage-Alpha'
+- 'Type-Auth'
+summary: 'Authentication via external script/process'
+...
+
+Introduction
+============
+
+Allow client authentication to be handled by an external script/process.
+
+Installation
+============
+
+mod\_auth\_external depends on a Lua module called
+[lpty](http://www.tset.de/lpty/). You can install it on many platforms
+using [LuaRocks](http://luarocks.org/), for example:
+
+       sudo luarocks install lpty
+
+Note: Earlier versions of the module did not depend on lpty. While using
+the newer version is strongly recommended, you can find the [older
+version
+here](https://prosody-modules.googlecode.com/hg-history/50ee38e95e754bf1034d980364f93564028b2f34/mod_auth_external/mod_auth_external.lua)
+if you need it (revision 50ee38e95e75 of the repository).
+
+Configuration
+=============
+
+As with all auth modules, there is no need to add this to
+modules\_enabled. Simply add in the global section, or for the relevant
+hosts:
+
+        authentication = "external"
+
+These options are specific to mod\_auth\_external:
+
+  -------------------------- -------------------------------------------------------------------------------------------------------------------------
+  external\_auth\_protocol   May be "generic" or "ejabberd" (the latter for compatibility with ejabberd external auth scripts. Default is "generic".
+  external\_auth\_command    The command/script to execute.
+  -------------------------- -------------------------------------------------------------------------------------------------------------------------
+
+Two other options are also available, depending on whether the module is
+running in 'blocking' or 'non-blocking' mode:
+
+  --------------------------- -------------- ------------------------------------------------------------------------------------------------------------------
+  external\_auth\_timeout     blocking       The number of seconds to wait for a response from the auth process. Default is 5.
+  external\_auth\_processes   non-blocking   The number of concurrent processes to spawn. Default is 1, increase to handle high connection rates efficiently.
+  --------------------------- -------------- ------------------------------------------------------------------------------------------------------------------
+
+Blocking vs non-blocking
+------------------------
+
+Non-blocking mode is automatically activated when:
+
+-   Running Prosody trunk ([nightly](http://prosody.im/nightly/) build
+    414+).
+-   [libevent](http://prosody.im/doc/libevent) is enabled in the config,
+    and LuaEvent is available.
+-   lpty (see installation above) is version 1.0.1 or later.
+
+Protocol
+========
+
+Prosody executes the given command/script, and sends it queries.
+
+Your auth script should simply read a line from standard input, and
+write the result to standard output. It must do this in a loop, until
+there's nothing left to read. Prosody can keep sending more lines to the
+script, with a command on each line.
+
+Each command is one line, and the response is expected to be a single
+line containing "0" for failure or "1" for success. Your script must
+respond with "0" for anything it doesn't understand.
+
+There are three commands used at the moment:
+
+auth
+----
+
+Check if a user's password is valid.
+
+Example: `auth:username:example.com:abc123`
+
+Note: The password can contain colons. Make sure to handle that.
+
+isuser
+------
+
+Check if a user exists.
+
+Example: `isuser:username:example.com`
+
+setpass
+-------
+
+Set a new password for the user. Implementing this is optional.
+
+Example: `setpass:username:example.com:abc123`
+
+Note: The password can contain colons. Make sure to handle that.
+
+ejabberd compatibilty
+---------------------
+
+ejabberd implements a similar protocol. The main difference is that
+Prosody's protocol is line-based, while ejabberd's is length-prefixed.
+
+Add this to your config if you need to use an ejabberd auth script:
+
+        external_auth_protocol = "ejabberd"
+
+Compatibility
+=============
+
+  ----- -------
+  0.8   Works
+  0.9   Works
+  ----- -------