Firefox rolls out ECH enabled by default in 118

Submitted ⁨⁨1⁩ ⁨year⁩ ago⁩ by ⁨Tibert@jlai.lu⁩ to ⁨technology@lemmy.world⁩

https://blog.mozilla.org/en/products/firefox/encrypted-hello/

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 …mozilla.org/…/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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NotSteve_@lemmy.ca ⁨1⁩ ⁨year⁩ ago
Encrypted Client Hello is something I’d come up with if I was trying to wildly guess an acronym haha

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r00ty@kbin.life ⁨1⁩ ⁨year⁩ ago
So, currently when you visit a https secured website the initial request to the server is not encrypted. I suspect the reason for this is that say you run a web server on 1.2.3.4. But there's 4 different websites hosted on that server each with their own SSL/TLS keys.

The server doesn't have a way to know which keys/certificates to use until it knows what site you want to access. So, the initial request is encrypted with a server key, and that server key is fetched via DNS over HTTPS.

Now, here's the question. Why MUST it be DoH? For email, DKIM, SPF and DMARC settings (including public keys) are configured using standard DNS (with DNSSEC). Why do they not allow DNSSEC AND/OR DoH?

Other than that weird limitation, I think it's a good thing.

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- lemmyvore@feddit.nl ⁨1⁩ ⁨year⁩ ago
  
  currently when you visit a https secured website the initial request to the server is not encrypted.
  
  It is encrypted. This actually used to be a problem. It was impossible to host multiple different domains on the same IP over HTTPS for this exact reason. Chicken and egg: couldn’t get the domain from the host header without completing the encryption handshake, but to do that you had to know which domain’s certificate to use.
  
  To solve the problem they came up with a TLS extension called SNI that indicates the certificate during handshake.
  
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- AProfessional@lemmy.world ⁨1⁩ ⁨year⁩ ago
  [deleted]
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  - lemmyvore@feddit.nl ⁨1⁩ ⁨year⁩ ago
    Hold on, these are orthogonal technologies.
    
    DNSSEC signs DNS records so you know they’re genuine and come straight from the authoritative nameservers for the domain.
    
    DoH encrypts DNS traffic so nobody can eavesdrop on what domains you connect to, and masks it as HTTPS traffic so providers can’t block it to force you to use their nameservers.
    
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Evilcoleslaw@lemmy.world ⁨1⁩ ⁨year⁩ ago

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 also 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.

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- epyon22@sh.itjust.works ⁨1⁩ ⁨year⁩ ago
  Probably because DNS is unencrypted and would allow tampering of the key needed for ECH to work
  
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- bjoern_tantau@swg-empire.de ⁨1⁩ ⁨year⁩ ago
  PiHole doesn’t support DoH? I mean as a server? Is there a feature request open for that?
  
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  - lemann@lemmy.one ⁨1⁩ ⁨year⁩ ago
    If pihole is still using dnsmasq then I have no idea if DoH will be supported tbh…
    
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- lemann@lemmy.one ⁨1⁩ ⁨year⁩ ago
  TIL about cloudflared being a DoH proxy. Nice, will be looking into this later…
  
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  - Evilcoleslaw@lemmy.world ⁨1⁩ ⁨year⁩ ago
    It works well, and it’s easy to set up. Previously I had used dnscrypt-proxy since it supports DoH as well.
    
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- MonkderZweite@feddit.ch ⁨1⁩ ⁨year⁩ ago
  You mean, you’re running a DoT proxy?
  
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  - Evilcoleslaw@lemmy.world ⁨1⁩ ⁨year⁩ ago
    No, DoH (DNS-over-HTTPS). I’d also previously set up a DoT proxy for use on my phone (since Android only supports DoT) but i decided to do something else for that.
    
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Kolanaki@yiffit.net ⁨1⁩ ⁨year⁩ ago
So will HTTPS sites actually open in HTTPS now? It’s the one thing that annoys the hell out of me since switching back to FF.

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- Spotlight7573@lemmy.world ⁨1⁩ ⁨year⁩ ago
  You can set Firefox to just do that for everything:
  
  support.mozilla.org/en-US/kb/https-only-prefs
  
  Chrome has a similar option here:
  
  support.google.com/chrome/answer/10468685#https-o…
  
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  - Kolanaki@yiffit.net ⁨1⁩ ⁨year⁩ ago
    It’s already on. The problem is going to a HTTPS site gives the “this site isn’t actually secure, would you like to open it in HTTP instead?” And doesn’t actually load the sites, which I know work, in HTTPS.
    
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