[tptacek]

None of this, none of it at all, has anything to do with Slack's ability to safely host conversations from the FBI. Whatever challenges they have with that are entirely orthogonal to this stupid performative stunt DNS configuration.

(There's a whole thread here, and more on Twitter, getting into the actual details of what FedRAMP and NIST require here, and engaging with the fact that Slack is the only large tech company in the past several years to have attempted to flip the DNSSEC switch on.)

[GabeIsko]

I work for a company that maintains DNSSEC on our FedRAMP deployment. It's not unreasonable to ask for signed DNS records if feds are going to hit them.

Your blog post makes the supposition that DNSSEC is only being pushed as an alternative means of security to CA for TLS. While it makes a compelling case that this isn't realistic, there are other security concerns that occur from the compromise of DNS records. If the government is going to use a DNS record, it should be signed by a zone owner.

Slack is actually a good use case for this security enforcement, because they maintain a handful of domains that are extremely authoritative for their messaging service[1]. If you can't maintain a security protocol on four domains that are crucial to the operation of your service, you maybe aren't cut out to supply software for the government.

1: https://slack.com/help/articles/360001603387-Manage-Slack-co...

[tptacek]

I've done security work for products deployed at DOD and in other sensitive agencies, and had firsthand experience with USG infosec, and the idea that the USG sets any kind of useful standard for infrastructure security is risible.

Unfortunately, the GSA product market is its own bubble, as is people who work in IT for the USG in any capacity, and so it's easy to see how people with limited exposure to modern industry practice --- experiences almost wholly gated through vendors that snake through the GSA acquisition process --- might believe themselves to be operating several levels above where they actually are.

I would take Slack's security practice --- their infrasec, their corpsec, their software security, the whole shebang --- over anything done in any USG agency. Slack is better at this than their USG clients are, full stop. And Slack, while strong, is far from the S tier of industry security teams.

[GabeIsko]

Well, the Slack security team seems to think that DNSSEC is important. Even for their workspace domains.

I just want to hammer home the point that requiring service providers to get their DNS records signed by DNS zone owners is a reasonable ask for USG software service vendors. Even if DNSSEC isn't capable of securing the whole internet.

[tptacek]

DNSSEC is utterly unimportant. Practically no major security team on the Internet enables it --- not Amazon's, not Google's, not Facebook's, not Microsoft's, not Apple's, not Oracle's, not IBM's, not Cisco's. The argument that DNSSEC is somehow necessary for secure infrastructure is an extraordinary claim, and it requires extraordinary evidence.

[GabeIsko]

Well, the operational requirements of commercial entities may be different than the federal government. Many of the companies that you mentioned offer FedRAMP services (with maybe the exception of Apple and Facebook), and they probably reckon with the spec on some level, even if they are not employing it internally. It is also pretty clear that Slack is going to implement it soon - they are going through all this trouble to allow to provide their signature every workspace get's a subdomain feature on FedRAMP. They really don't have to do that. Or maybe they do, in which case I would argue that it is probably good practice to be able to interrogate the DNS records they maintain.

Either way, this argument is starting to become political. Is Facebook a role model for cybersecurity, and keeping data out of the wrong hands? Or do NIST researchers know better? Neither - the government outlines its security requirements, and private companies play ball to compete for their business. And if a federal agency wants to be able to prove a DNS record's authenticity, even if it is maintained by a vendor, even if that isn't sufficient to secure their infrastructure, that's their prerogative.

[tptacek]

Facebook is better --- more competent, more effective --- at cybersecurity than the US Government by a factor of $lots.