![]() ![]() ![]() On iOS 14, to make use of DoH, we need to configure the NWParameters.Privac圜ontext with a DNS (which supports DoH) resolver’s central host HTTPS and its backup hosts IPs. ![]() TLS 1.3 mitigates it.īased on the above, DoH is a definite winner. Even with encrypted DNS, TLS connections contain unencrypted domain names (SNI).It looks like regular HTTPS traffic, while DNS over TLS requires separate port usage, namely: 853. It’s harder for mediators to monitor and censor DNS queries if it’s DNS over HTTPS.DNS over TLS may seem faster as it’s one level lower, but based on benchmarks, that’s not the case.To decide which one is better to use, you can read multiple articles on the web that compare DoH to DoT, but it all boils down to these points: Firewalls can easily intercept, block or modify any unencrypted DNS traffic based on the port number alone.Įncrypted DNS (DoH or DoT) mitigates the privacy issue illustrated above.Queries could be directed to a resolver that performs DNS hijacking.Moreover, since the DNS messages are unprotected, other attacks are possible: To eavesdrop on the DNS queries, I will use Wireshark, a well-known network protocol analyzer.Īs you can see in the figure below, Wireshark mapped the service and its IP addresses used in the sample code easily. To better understand how easy it is for someone to eavesdrop on unencrypted DNS queries, let’s run the following sample code: You can read more about DoH and DoT here Unencrypted DNS So why bother encrypting DNS queries when HTTPS is widely in use? Because if someone (ISPs, on-path routers, law enforcement agency, etc.) is eavesdropping on your application’s unencrypted DNS queries, they will be able to map which API / services your application uses and potentially “map” your service. In iOS 14, Apple introduced support for passing the DNS queries over HTTPS (DoH) or TLS (DoT). ![]()
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