view mod_auth_external_insecure/README.markdown @ 5401:c8d04ac200fc

mod_http_oauth2: Reject loopback URIs as client_uri This really should be a proper website with info, https://localhost is not good enough. Ideally we'd validate that it's got proper DNS and is actually reachable, but triggering HTTP or even DNS lookups seems like it would carry abuse potential that would best to avoid.
author Kim Alvefur <zash@zash.se>
date Tue, 02 May 2023 16:20:55 +0200
parents 8e58a1b78336
children
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---
labels:
- 'Stage-Deprecated'
- 'Type-Auth'
summary: 'Authentication via external script/process (DEPRECATED)'
...

Introduction
============

Allow client authentication to be handled by an external script/process.

:::{.alert .alert-warning}
**Warning:** This module is not currently maintained, and may be buggy and insecure in
certain configurations/environments. It is **not** recommended for production use. Please
use one of the [many other authentication modules](/type_auth).
:::

Installation
============

mod\_auth\_external\_insecure 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

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_insecure"

These options are specific to mod\_auth\_external\_insecure:

  -------------------------- -------------------------------------------------------------------------------------------------------------------------
  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 experimental and is disabled by default.

Enable at your own risk if you fulfil these conditions:

-   Running Prosody trunk ([nightly](http://prosody.im/nightly/) build
    414+) or Prosody 0.11.x.
-   [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.

```lua
external_auth_blocking = false;
```

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 compatibility
---------------------

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
  ----- -------