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mod_s2s_auth_dane: Fix markdown link syntax
author Kim Alvefur <>
date Thu, 23 Apr 2020 20:12:42 +0200
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- 'Stage-Alpha'
- 'Type-S2SAuth'
summary: S2S authentication using DANE


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


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

LuaSec 0.5 or later is also required.


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

    modules_enabled = {


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
`` serving the domain ``.

    ; Your standard SRV record IN SRV 0 0 5269
    ; IPv4 and IPv6 addresses IN A IN AAAA 2001:0db8:0000:0000:4441:4e45:544c:5341

    ; The DANE TLSA records. 300 IN TLSA 3 0 1 E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855

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

[List of DNSSEC and DANE

Further reading

-   [DANE Operational Guidance][rfc7671]


Works with Prosody 0.9 until 0.11.

**Broken** since [trunk revision 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.