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| author | Kim Alvefur <zash@zash.se> |
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| date | Tue, 29 Jun 2021 12:48:42 +0200 |
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| 1803 | 1 --- |
| 2 labels: | |
| 3 - 'Stage-Alpha' | |
| 4 - 'Type-S2SAuth' | |
| 5 summary: S2S authentication using DANE | |
| 6 ... | |
| 7 | |
| 8 Introduction | |
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9 ============ |
| 1803 | 10 |
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11 This module implements DANE as described in [Using DNS Security |
| 1803 | 12 Extensions (DNSSEC) and DNS-based Authentication of Named Entities |
| 13 (DANE) as a Prooftype for XMPP Domain Name | |
| 14 Associations](http://tools.ietf.org/html/draft-miller-xmpp-dnssec-prooftype). | |
| 15 | |
| 16 Dependencies | |
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17 ============ |
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19 This module requires a DNSSEC aware DNS resolver. Prosodys internal DNS |
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20 module does not support DNSSEC. Therefore, to use this module, a |
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21 replacement is needed, such as [this |
| 1803 | 22 one](https://www.zash.se/luaunbound.html). |
| 23 | |
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24 LuaSec 0.5 or later is also required. |
| 1803 | 25 |
| 26 Configuration | |
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27 ============= |
| 1803 | 28 |
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29 After [installing the module][doc:installing\_modules], just add it to |
| 1803 | 30 `modules_enabled`; |
| 31 | |
| 32 modules_enabled = { | |
| 33 ... | |
| 34 "s2s_auth_dane"; | |
| 35 } | |
| 36 | |
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37 DANE Uses |
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38 --------- |
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39 |
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40 By default, only DANE uses are enabled. |
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41 |
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42 dane_uses = { "DANE-EE", "DANE-TA" } |
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43 |
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44 Use flag Description |
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45 ----------- ------------------------------------------------------------------------------------------------------- |
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46 `DANE-EE` Most simple use, usually a fingerprint of the full certificate or public key used the service |
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47 `DANE-TA` Fingerprint of a certificate or public key that has been used to issue the service certificate |
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48 `PKIX-EE` Like `DANE-EE` but the certificate must also pass normal PKIX trust checks (ie standard certificates) |
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49 `PKIX-TA` Like `DANE-TA` but must also pass normal PKIX trust checks (ie standard certificates) |
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50 |
| 1803 | 51 DNS Setup |
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52 ========= |
| 1803 | 53 |
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54 In order for other services to verify your site using using this plugin, |
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55 you need to publish TLSA records (and they need to have this plugin). |
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56 Here's an example using `DANE-EE Cert SHA2-256` for a host named |
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57 `xmpp.example.com` serving the domain `example.com`. |
| 1803 | 58 |
| 59 $ORIGIN example.com. | |
| 60 ; Your standard SRV record | |
| 61 _xmpp-server._tcp.example.com IN SRV 0 0 5269 xmpp.example.com. | |
| 62 ; IPv4 and IPv6 addresses | |
| 63 xmpp.example.com. IN A 192.0.2.68 | |
| 64 xmpp.example.com. IN AAAA 2001:0db8:0000:0000:4441:4e45:544c:5341 | |
| 65 | |
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66 ; The DANE TLSA records. |
| 1803 | 67 _5269._tcp.xmpp.example.com. 300 IN TLSA 3 0 1 E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855 |
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68 |
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69 ; If your zone file tooling does not support TLSA records, you can try the raw binary format: |
| 1803 | 70 _5269._tcp.xmpp.example.com. 300 IN TYPE52 \# 35 030001E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855 |
| 71 | |
| 72 [List of DNSSEC and DANE | |
| 73 tools](http://www.internetsociety.org/deploy360/dnssec/tools/) | |
| 74 | |
| 75 Further reading | |
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76 =============== |
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78 - [DANE Operational Guidance][rfc7671] |
| 1803 | 79 |
| 80 Compatibility | |
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81 ============= |
| 1803 | 82 |
| 3990 | 83 Works with Prosody 0.9 until 0.11. |
| 84 | |
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85 **Broken** since [trunk revision 756b8821007a](https://hg.prosody.im/trunk/rev/756b8821007a). |
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86 |
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87 Known issues |
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88 ============ |
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89 |
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90 - A race condition between the DANE lookup and completion of the TLS |
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91 handshake may cause a crash. This does not happen in **trunk** |
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92 thanks to better async support. |
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93 |
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94 |