Just to make sure we’re all on the same page:
If system DNS settings are changed in Whonix, this has no effect on Tor Browser whatsoever. One could even disable system DNS in Whonix.
(This is an optional configuration documented here: https://www.whonix.org/wiki/Stream_Isolation#Better_Protection)
Tor Browser would still be fully functional. This is because Tor Browser talks directly to a Tor
In other words, even if we filled up lets say
/etc/resolv.conf with onion DNS servers (if this is how this is supposed to be implemented), Tor Browser wouldn’t benefit from it. The only applications benefiting from it would be those using system default networking (system default DNS). I.e. applications not configured to use a Tor
SocksPort using proxy settings or a socksifier (
Therefore if resolving DNS over onion is an improvement indeed (Tor Project opinion required), then it’s still best if this is directly implemented in Tor. In theory would be best if Tor Project modified Tor so that all, Tor
SocksPorts and Tor’s
DnsPort use onions rather than Tor exit relays for DNS resolution.
It could be more fingerprintable because DNS resolution over onion might take longer than DNS resolution over Tor exit relays. For system default networking Whonix is using Tor’s
TransPort and for system default DNS Whonix is using Tor’s
DnsPort. This is how it is supposed to be implemented.
(According to https://trac.torproject.org/projects/tor/wiki/doc/TransparentProxy)
While redirecting traffic to Tor’s
DnsPort isn’t something that Tor currently doing (that is the task for the system administrator or a distribution such as Whonix), yet Tor provides a fine platform for system DNS resolution. Therefore I don’t think this is out of scope for Tor Project. To paraphrase "catch the traffic using iptables and redirect it to Tor’s
Since when does Tor Browser use Cloudflare’s onion resolver? I cannot find any reference for that.
In any case, if something can be improved related to DNS over Tor, then it’s best to report this to Tor Project first. Both Tor Browser or even better Tor developers could decide to pick this up.