https://www.cblanken.dev/til/ Zola en Mon, 16 Sep 2024 00:00:00 +0000 Cameron Blankenbuehler https://www.cblanken.dev/til/iana-protocols/ https://www.cblanken.dev/til/iana-protocols/ <p>If you’ve ever found yourself browsing through RFCs published by the <a rel="external" href="https://www.ietf.org">IETF</a>, you know it can be a bit of a chore if you’re just researching some tag name or error code. You shouldn’t need to read through the entire spec for a protocol just to do some troubleshooting. Right? Well, here comes <a rel="external" href="https://www.iana.org">IANA</a> to the rescue. IANA has conveniently compiled a central repository for the many codes and numbers contained in Internet protocols. You can find it at their <a rel="external" href="https://www.iana.org/protocols">protocol registry</a>.</p> <p>Personally I was just looking for a <a rel="external" href="https://www.iana.org/assignments/dmarc-parameters/dmarc-parameters.xhtml#tag">simple breakdown</a> of all the tags available for DMARC. Of course, there’s also a <a rel="external" href="https://www.rfc-editor.org/rfc/rfc7489.html#section-11.4">DMARC tag registry table</a> embedded in the <a rel="external" href="https://www.rfc-editor.org/rfc/rfc7489.html">DMARC RFC (RFC 7489)</a>. But I was having trouble wading through all 73 pages of the spec. So, in this case, it wasn’t really necessary. However, for something like the <a rel="external" href="https://www.iana.org/assignments/mail-parameters/mail-parameters.xhtml#mail-parameters-2">SMTP service extensions</a>, it can be much more useful as the service extensions are spread across many different RFCs.</p> Tue, 03 Sep 2024 00:00:00 +0000 Cameron Blankenbuehler https://www.cblanken.dev/til/learning-dmarc/ https://www.cblanken.dev/til/learning-dmarc/ <p>I’ve recently been trying to get a better handle on how email works and how it’s secured. If you want to do the same. Go try out the exercises at <a rel="external" href="https://www.learndmarc.com">https://www.learndmarc.com</a>.</p> <p>It’s a great resource for visualizing how DMARC works in conjuction with <a rel="external" href="https://datatracker.ietf.org/doc/html/rfc7208">Sender Policy Framework (SPF)</a> and <a rel="external" href="https://datatracker.ietf.org/doc/html/rfc4686">Domain Keys Identified mail (DKIM)</a> to secure email and catch spam and phishing attempts.</p> <p>There’s even a quiz you can try to see how well you can analyze email traffic and determine the DMARC results.</p>