Back from the dead – DNSCrypt-Proxy v2

I wrote about the death of DNSCrypt and I recommend to use DNS-over-TLS which might be a thing, however the problem with DNS-over-TLS is that it leaks the hostname in plain text by the Server Name Indication (SNI) extension for TLS. This can be a problem and there will be no solution for it, the currently implementation of TLS-over-DNS is a bit tricky because not every server owner uses the RFC or he tries to ‘fix’ something which might break the connection, as a result you see often a disconnect or packages getting ‘lost’. That’s why stubby is unstable, cause every test server is nothing but that .. a test and there all more or less unstable for a daily usage.

DNSCryptv2
Official DNSCrypt-Proxy 2 Logo

So the old DNSCrypt is dead due some reasons and what you can use, DNS-over-TLS or .. well DNSCrypt-Proxy 2. The project is from the same Frank Denis, . It’s currently active under development and there are several planned features.

Current status/features

Features dnscrypt-proxy 1.x dnscrypt-proxy 2.x
Status Old PoC, barely maintained any more Very new, but quickly evolving
Code quality Big ugly mess Readable, easy to work on
Reliability Poor, due to completely broken handling of edge cases Excellent
Security Written in C, bundles patched versions from old branches of system libraries Written in standard and portable Go
Dependencies Specific versions of dnscrypt-proxy, libldns and libtool None
Upstream connections using TCP Catastrophic, requires client retries Implemented as anyone would expect, works well with TOR
XChaCha20 support Only if compiled with recent versions of libsodium Yes, always available
Support of links with small MTU Unreliable due to completely broken padding Reliable, properly implemented
Support for multiple servers Nonexistent Yes, with automatic failover and load-balancing
Custom additions C API, requires libldns for sanity Simple Go structures using miekg/dns
AAAA blocking for IPv4-only networks Yes Yes
DNS caching Yes, with ugly hacks for DNSSEC support Yes, without ugly hacks
EDNS support Broken with custom records Yes
Asynchronous filters Lol, no, filters block everything Of course, thanks to Go
Session-local storage for extensions Impossible Yes
Multicore support Nonexistent Yes, thanks to Go
Efficient padding of queries Couldn’t be any worse Yes
Multiple local sockets Impossible Of course. IPv4 & IPv6, as many as you like
Automatically picks the fastest servers Lol, it supports only one at a time, anyway Yes, out of the box
Official, always up-to-date pre-built libraries None Yes, for many platforms. See below.
Automatically downloads and verifies servers lists No. Requires custom scripts, cron jobs and dependencies (minisign) Yes, built-in, including signature verification

Planned features

  • New super simple (to copy & paste), extensible format for servers parameters: “stamps”
  • Filtering with regexes
  • Offline responses
  • Local DNSSEC validation
  • Flexible logging
  • Windows support that doesn’t suck
  • DNS-over-HTTP2
  • Some real documentation

Final words

It’s always good to have some alternatives, especially in case something dies or if you’re unhappy with solution x. I think the project looks as promising as the original DNSCrypt project and I will keep an eye on it.

A alpha download can be found here, since the project is on an earlier stage I not want to give a conclusion because I see the benefits and what is planned, such huge changes need time, testing and a lot effort, so give it time.

The given binaries worked on my end on Linux and under Windows, I had several disconnects but it overall already worked well.

 

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