3 ms·

Corporations concerned about that should be blocking DoH anyway

isostatic 7y ago
Any device at home an go to http://nas http://nas and get on my nas, "http://desktop" http://desktop", "http://router" http://router", and "http://shed" http://shed" and get on those. How does that work in this bold new future? I'll have to register a domain name and add a bunch of A records for 192.168.0.1, but then it still won't work -- I'll have to do "http://desktop.mydomain.com" http://desktop.mydomain.com". Worse, while going to "shed" will work in chrome, it will fail in firefox. My guest network captive portal may well break too if someone visits with firefox.
- Gaelan 7y ago
  Firefox claims they will detect this situation and disable DoH.
  - Tharkun 7y ago
    Detect it, how? By forwarding the request to a local resolver after DoH fails, and thus leaking information?
    - ripdog 7y ago
      Do you... really care if someone outside you network knows the domain you chose for an internal network service? That's not sensitive information. Also, there's basically no way for cloudflare, even if they were being malicious about it, to collect and use that information. What would they do with it?
      - userbinator 7y ago
        It's definitely sensitive information --- useful for attackers to find out the structure of the LAN.
      - Tharkun 7y ago
        Yes, I care. Why don't you? I work for Tier 1 banks. They are paranoid, and rightly so. One of their many paranoid rules is that hostnames can never betray the machine's purpose. You could easily analyze DoH stats and deduce certain machines' functions. Leaking information is bad.
- roelschroeven 7y ago
  I don't know why you're downvoted, because that is a very good question. What you have to do is add an entry in your local nameserver for domain use-application-dns.net and set it to NXDOMAIN. See https://support.mozilla.org/en-US/kb/configuring-networks-disable-dns-over-https https://support.mozilla.org/en-US/kb/configuring-networks-di.... Hopefully Google will use the same method for disabling DoH in Chrome. But I won't be surprised if they're going to force DoH even harder, and make it even more difficult to turn off.
cremp 7y ago
How can you block it, if the browser itself is doing the communication, over https no-less? DoH was made to stop censorship, which includes blocking; if you could just block it, then whats the point of DoH?
- profmonocle 7y ago
  DoH uses regular DNS to get the IP address of the DoH server. So they could just block queries for the most popular DoH servers.

Any device at home an go to http://nas http://nas and get on my nas, "http://desktop" http://desktop", "http://router" http://router", and "http://shed" http://shed" and get on those. How does that work in this bold new future? I'll have to register a domain name and add a bunch of A records for 192.168.0.1, but then it still won't work -- I'll have to do "http://desktop.mydomain.com" http://desktop.mydomain.com". Worse, while going to "shed" will work in chrome, it will fail in firefox. My guest network captive portal may well break too if someone visits with firefox.

Gaelan 7y ago
Firefox claims they will detect this situation and disable DoH.
- Tharkun 7y ago
  Detect it, how? By forwarding the request to a local resolver after DoH fails, and thus leaking information?
  - ripdog 7y ago
    Do you... really care if someone outside you network knows the domain you chose for an internal network service? That's not sensitive information. Also, there's basically no way for cloudflare, even if they were being malicious about it, to collect and use that information. What would they do with it?
    - userbinator 7y ago
      It's definitely sensitive information --- useful for attackers to find out the structure of the LAN.
    - Tharkun 7y ago
      Yes, I care. Why don't you? I work for Tier 1 banks. They are paranoid, and rightly so. One of their many paranoid rules is that hostnames can never betray the machine's purpose. You could easily analyze DoH stats and deduce certain machines' functions. Leaking information is bad.
roelschroeven 7y ago
I don't know why you're downvoted, because that is a very good question. What you have to do is add an entry in your local nameserver for domain use-application-dns.net and set it to NXDOMAIN. See https://support.mozilla.org/en-US/kb/configuring-networks-disable-dns-over-https https://support.mozilla.org/en-US/kb/configuring-networks-di.... Hopefully Google will use the same method for disabling DoH in Chrome. But I won't be surprised if they're going to force DoH even harder, and make it even more difficult to turn off.

cremp 7y ago

How can you block it, if the browser itself is doing the communication, over https no-less? DoH was made to stop censorship, which includes blocking; if you could just block it, then whats the point of DoH?

profmonocle 7y ago
DoH uses regular DNS to get the IP address of the DoH server. So they could just block queries for the most popular DoH servers.