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Mozilla’s DNS over HTTPs

blog.mozilla.org

481–490 of 777 posts

Re: Mozilla’s DNS over HTTPs

#481
post #408

Earlier quoted context omitted.

There's no difference that a DNS server can see between a browser on your computer making a DNS request vs. any other app. But if the browser is using DoH and other apps don't, then it can tell.

Right, but that's just an argument for more applications and lower level networking stacks to support DoH.

[deleted]

Re: Mozilla’s DNS over HTTPs

#482
post #408

Earlier quoted context omitted.

There's no difference that a DNS server can see between a browser on your computer making a DNS request vs. any other app. But if the browser is using DoH and other apps don't, then it can tell.

Right, but that's just an argument for more applications and lower level networking stacks to support DoH.

Not really. It's an argument for the industry moving to something sensible; not "split braining" low level infrastructure by shoehorning some of it into HTTP, apps and a handful of centralised coporations who claim to play a little nicer than telcos.

Re: Mozilla’s DNS over HTTPs

#483
post #449
post #289

I'm so sad to see Mozilla move forward with this massive attack on user privacy. Firefox DoH is snake oil, plain and simple. It sends all the users DNS queries to Cloudflare, adding a new party which can surveil the user's traffic (and can be legally compelled to do so and not disclose this fact)-- providing a convenient choke point to save spies and hackers the trouble and exposure of extracting the data from tens o…

Your ISP is literally selling this information right now in the US. What are you even talking about? Use google if you don't like CF, or just disable it! Do a little threat modeling here please. Let's say CF sells this data, what do they know about you other than your IP and the sites you visit? While your ISP,employer,school,etc... Can tie that activity to you as a person. Being compelled legally? I did not know pri…

> Your ISP is literally selling this information right now in the US. What are you even talking about?

Every time Firefox starts up it probably phones home to check for updates. The incoming request is traceable from the user's IP and Mozilla could figure out if the user is with a privacy-violating ISP: they could then only enable OS-bypassing DoH for those users.

Those who run Firefox in corporate networks would be unaffected, as would those who are were 'good' ISPs.

Also, as someone in Canada, I downloaded the "English" version of Firefox, which probably meant "en_US" locale: guess what, I'm affected. As are plenty of less technical people who don't understand about going into about:config and changing things to "en_CA".

Re: Mozilla’s DNS over HTTPs

#484
post #423
post #289

I'm so sad to see Mozilla move forward with this massive attack on user privacy. Firefox DoH is snake oil, plain and simple. It sends all the users DNS queries to Cloudflare, adding a new party which can surveil the user's traffic (and can be legally compelled to do so and not disclose this fact)-- providing a convenient choke point to save spies and hackers the trouble and exposure of extracting the data from tens o…

SNI is not a good argument, there is work being done to encrypt that as well in TLS 1.3 with Encrypted SNI[1]. [1] https://blog.cloudflare.com/encrypted-sni/

There's a tcp/443 connection to 208.80.153.224, what site could it be?

$ whois 208.80.153.224

NetRange: 208.80.152.0 - 208.80.155.255

CIDR: 208.80.152.0/22

NetName: WIKIMEDIA

NetHandle: NET-208-80-152-0-1

Parent: NET208 (NET-208-0-0-0-0)

NetType: Direct Assignment

OriginAS: AS14907

Organization: Wikimedia Foundation Inc. (WIKIM)

RegDate: 2007-07-23

Updated: 2014-01-29

Comment: http://www.wikimediafoundation.org

Ref: https://rdap.arin.net/registry/ip/208.80.152.0

Re: Mozilla’s DNS over HTTPs

#485

Seems very marginal for privacy when people in the middle can still see the IP you're connecting to, just not which DNS record you may have retrieved the IP with.

It's far easier for ISPs to scrape up your DNS queries (they run the resolver) than it is for the to make correlations based on IP addresses, especially with multiple websites hosted on the same IP.

So all DoH does (once ESNI is eventually a thing) is alter this equation. ISPs will simply begin correlating IPs (and CT logs: http://blog.seanmcelroy.com/2019/01/05/ocsp-web-activity-is-...) instead.

Re: Mozilla’s DNS over HTTPs

#486

Earlier quoted context omitted.

> Don't run devices on your network you don't trust. Oh, is that all? How about I trust the devices until a secretary clicks on a (spear)phishing link that runs a zero-day. Then what? The host is compromised so I can no longer trust any end-device monitoring software on it, and now the network traffic is opaque. And that doesn't even get into things like academia where students and visiting researchers bring devices…

So you're counting on malware's continued use of plaintext DNS as part of your network's security strategy?

If anything hits port 53 on the outgoing gateway, and it's not from our recursive servers, then we know that network element needs to be looked at: either it's mis-configured or malicious.

Anything that uses our recursive servers is monitored, and we can check against blacklists, either in real-time or after-the-fact through logging.

* https://en.wikipedia.org/wiki/Domain_generation_algorithm

* https://en.wikipedia.org/wiki/Botnet#Domains

If malware is connecting to hard-coded IPs then there's nothing we can do about that.

So yes: monitoring DNS for suspicious activity is part of our security strategy.

Re: Mozilla’s DNS over HTTPs

#487
post #449
post #289

I'm so sad to see Mozilla move forward with this massive attack on user privacy. Firefox DoH is snake oil, plain and simple. It sends all the users DNS queries to Cloudflare, adding a new party which can surveil the user's traffic (and can be legally compelled to do so and not disclose this fact)-- providing a convenient choke point to save spies and hackers the trouble and exposure of extracting the data from tens o…

Your ISP is literally selling this information right now in the US. What are you even talking about? Use google if you don't like CF, or just disable it! Do a little threat modeling here please. Let's say CF sells this data, what do they know about you other than your IP and the sites you visit? While your ISP,employer,school,etc... Can tie that activity to you as a person. Being compelled legally? I did not know pri…

Sorry for channeling the dude here but that is just, like your opinion man.

I think many of the critical voices now are coming from the EU. We have data protection laws. The ISP can't just sell browsing data. That has been illegal since before we had data protection laws, that is actually legally the same as opening other people's letters and reading them. So ... different threat model over here.

I am always using the US-EN Firefox version because frankly why would I use translated software when I can understand and use the original.

I hope you can see how it might be of concert to me whether Mozilla decides to give my browsing data to Cloudflare, whom I have about as much reason to trust as GCHQ or the NSA.

Re: Mozilla’s DNS over HTTPs

#488

If you are a network administrator and want none of this, look at that: https://support.mozilla.org/en-US/kb/canary-domain-use-appli... Basically, make use-application-dns.net. return an error (any kind will do). Filter it in your recursor for example. Having the browser change a fundamental behaviour that used to stand for decades is highly problematic. If nothing else, it is the network administrator who should hav…

Can't imagine that will last for long. Otherwise what stops Telcos/ISPs blocking this in their resolvers.

Re: Mozilla’s DNS over HTTPs

#489
post #382

Earlier quoted context omitted.

I can use a VPN when browsing on those kind of networks.

That's fine for more technical users who are aware of how to mitigate this kind of issue, but then those same more technical users will also likely know how to disable DoH. For the majority of users who may not understand the risks around plain text DNS, there are advantages to it being encrypted.

> will also likely know how to disable DoH.

Not once DoH-in-the-browser becomes a default, percolates down to electron and then gets baked into a dozen mobile and desktop applications with little control or insight for the user or admin.

Re: Mozilla’s DNS over HTTPs

#490
post #474

Earlier quoted context omitted.

That's fine for more technical users who are aware of how to mitigate this kind of issue, but then those same more technical users will also likely know how to disable DoH. For the majority of users who may not understand the risks around plain text DNS, there are advantages to it being encrypted.

This has always been a poor argument. Especially for FF which is mainly used by Technical people Chrome a d IE are used by people that do not understand the risks around DNS I use FF because I am / was tried of IE and Chrome telling me how I should use thier software, now Mozilla is making the same moronic choices for me instead of empowering users DoH should be Opt-In, not Opt-Out

You using FFox because you're technical, doesn't mean a majority of FFox's user base is technical.

Technical users (like yourself) can just easily disable DoH, problem, for you, solved :)

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