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mod_muc_rtbl: also filter messages This was a bit tricky because we don't want to run the JIDs through SHA256 on each message. Took a while to come up with this simple plan of just caching the SHA256 of the JIDs on the occupants. This will leave some dirt in the occupants after unloading the module, but that should be ok; once they cycle the room, the hashes will be gone. This is direly needed, otherwise, there is a tight race between the moderation activities and the actors joining the room.
author Jonas Schäfer <jonas@wielicki.name>
date Tue, 21 Feb 2023 21:37:27 +0100
parents 83afe4078e6e
children
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---
labels:
- Stage-Broken
- Type-S2SAuth
summary: S2S authentication using DANE
...

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

This module implements DANE as described in [Using DNS Security
Extensions (DNSSEC) and DNS-based Authentication of Named Entities
(DANE) as a Prooftype for XMPP Domain Name
Associations](http://tools.ietf.org/html/draft-miller-xmpp-dnssec-prooftype).

Dependencies
============

This module requires a DNSSEC aware DNS resolver. Prosodys internal DNS
module does not support DNSSEC. Therefore, to use this module, a
replacement is needed, such as [this
one](https://www.zash.se/luaunbound.html).

LuaSec 0.5 or later is also required.

Configuration
=============

After [installing the module][doc:installing\_modules], just add it to
`modules_enabled`;

    modules_enabled = {
     ...
     "s2s_auth_dane";
    }

DANE Uses
---------

By default, only DANE uses are enabled.

    dane_uses = { "DANE-EE", "DANE-TA" }

  Use flag    Description
  ----------- -------------------------------------------------------------------------------------------------------
  `DANE-EE`   Most simple use, usually a fingerprint of the full certificate or public key used the service
  `DANE-TA`   Fingerprint of a certificate or public key that has been used to issue the service certificate
  `PKIX-EE`   Like `DANE-EE` but the certificate must also pass normal PKIX trust checks (ie standard certificates)
  `PKIX-TA`   Like `DANE-TA` but must also pass normal PKIX trust checks (ie standard certificates)

DNS Setup
=========

In order for other services to verify your site using using this plugin,
you need to publish TLSA records (and they need to have this plugin).
Here's an example using `DANE-EE Cert SHA2-256` for a host named
`xmpp.example.com` serving the domain `example.com`.

    $ORIGIN example.com.
    ; Your standard SRV record
    _xmpp-server._tcp.example.com IN SRV 0 0 5269 xmpp.example.com.
    ; IPv4 and IPv6 addresses
    xmpp.example.com. IN A 192.0.2.68
    xmpp.example.com. IN AAAA 2001:0db8:0000:0000:4441:4e45:544c:5341

    ; The DANE TLSA records.
    _5269._tcp.xmpp.example.com. 300 IN TLSA 3 0 1 E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855

    ; If your zone file tooling does not support TLSA records, you can try the raw binary format:
    _5269._tcp.xmpp.example.com. 300 IN TYPE52 \# 35 030001E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855

[List of DNSSEC and DANE
tools](http://www.internetsociety.org/deploy360/dnssec/tools/)

Further reading
===============

-   [DANE Operational Guidance][rfc7671]

# Compatibility

  version   status
  --------- ------------
  trunk     broken[^1]
  0.12      broken
  0.11      works
  0.10      works
  0.9       works

**Broken** since [trunk revision 756b8821007a](https://hg.prosody.im/trunk/rev/756b8821007a).

# Known issues

-   A race condition between the DANE lookup and completion of the TLS
    handshake may cause a crash. This does not happen in **trunk**
    thanks to better async support.

[^1]: since [756b8821007a](https://hg.prosody.im/trunk/rev/756b8821007a)