Cleaning Up A Generated DKIM Entry for DNS-Webinterfaces

You want to use DKIM, you brave soul? Have you got everything set up? Consequently you asked one of the handy (online) tools spit out a configuration like this:

    oachkatzlschwoaf._domainkey  IN  TXT ( "v=DKIM1; h=sha265; k=rsa; s=email; "
        "p=YXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYX"
		"kahdkahsdkahsdkahdkahsdkahskdhakdhakhdkahdkahdkahdkahdkahdkadkahkdh"
        "ABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABAB==" )  ; ----- DKIM key oachkatzlschwoaf for domain example.com

So how do you get this into the DNS via your hosters webinterface?

For one, you need the „selector” as the „name” of your DNS entry. In this example, that would be „oachkatzlschwoaf._domainkey”.

The „value” of the DNS entry would be everything within the parentheses. As there is a 255-byte maximum length for a string within a single TXT or SPF RR record and according to RFC 4408 „Sender Policy Framework (SPF) for Authorizing Use of Domains in E-Mail, Version 1” a A domain name MUST NOT have multiple record , the published key has to be broken up into multiple strings.
This is exactly what those generators already do for you.

So the „value” in the DNS entry would look like this one once a DKIM checker queried the DNS and parsed the result:

v=DKIM1;H=sha265;k=rsa;s=email;p=YXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXYXABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABAB==

HTH

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[Montag, 20170313, 19:52 | permanent link | 0 Kommentar(e)


Links from 2017-03-04

Aptik - A Tool to Backup/Restore Your Favourite PPAs and Apps in Ubuntu

Aptik is a open source package that simplify backup and restore of PPAs, Applications and Packages after a fresh installation or upgradation of Debian based Ubuntu, Linux Mint and other Ubuntu derivatives.

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[Sonntag, 20170305, 05:00 | permanent link | 0 Kommentar(e)


Links from 2017-03-01

"e;Deutschland braucht bis 2025 flächendeckend Glasfaseranschlüsse mit mindestens 1 GBit/s.

"Reine Glasfaseranschlüsse bis direkt zu allen Bürgern und Unternehmen sind schon bald so wichtig wie ein Wasser- oder Stromanschluss", meint der Präsident des Bundesverband Breitbandkommunikation (Breko), Norbert Westfal.

… um den Weg in die Gigabit-Gesellschaft zu bereiten und den Digitalisierungsbedarf etwa rund um die nächste Mobilfunkgeneration 5G zu decken. Diese brauche als Fundament ein schnelles Festnetz, auch wenn die konkreten Leistungsparameter und Verfügbarkeitszeiten noch offen seien.

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[Donnerstag, 20170302, 05:00 | permanent link | 0 Kommentar(e)


Disclaimer

„Leyrers Online Pamphlet“ ist die persönliche Website von mir, Martin Leyrer. Die hier veröffentlichten Beiträge spiegeln meine Ideen, Interessen, meinen Humor und fallweise auch mein Leben wider.
The postings on this site are my own and do not represent the positions, strategies or opinions of any former, current or future employer of mine.

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