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241

Firefox rolls out ECH enabled by default in 118 (blog.mozilla.org)

submitted 1 year ago by [email protected] to c/[email protected]

18 comments fedilink hide all child comments

ECH (encrypted client hello) is going or get enabled by default (already existed in a hidden setting) with version 118.

This page about the version explains a bit better ECH https://support.mozilla.org/fr/kb/understand-encrypted-client-hello

Tho it is still a bit confusing.

From what I understand there is the DNS query > the dns servers sends back an IP. This DNS query can be encrypted with DoH (or DoT?, it seems only DoH from the post).

Then there is a handshake with the website where the website informations can be leaked, and that can be encrypted by ECH (if the website supports it).

Then after that there is a tls connexion established between the website and the user.

The part where I'm confused is : can ECH be used without DoH? If yes that would mean that I can use a DoH capable software and not have to configure it into Firefox? (ex: Nextdns + yogadns)

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[–] [email protected] 10 points 1 year ago* (last edited 1 year ago) (7 children)

ECH relies on DNS over HTTPS (DoH) for its functionality, using it to fetch the key needed for encryption.

Seems like it's only DoH. Which is kinda lame in a situation like mine where I'm running a DoH proxy (cloudflared), using a PiHole behind that, and pointing my LAN clients at the PiHole using unencrypted DNS. So everything leaving my network is DoH but it's not done directly in the browser, so I can't take advantage of ECH.

[–] epyon22 9 points 1 year ago

Probably because DNS is unencrypted and would allow tampering of the key needed for ECH to work

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