diff --git a/dnscrypt/index.md b/dnscrypt/index.md index c8c749f..48c802e 100644 --- a/dnscrypt/index.md +++ b/dnscrypt/index.md @@ -65,6 +65,12 @@ First of all, if we were to figure out which of these protocols protects us, we' | Detectability | ❎️The protocol has its own standard port (853/TCP) which makes it super easy to detect for a 3rd party | ✅ The protocol blends in with HTTPS traffic, which makes it much harder to detect | ✳️ Although DNSCrypt listens on port 443 (UDP/TCP, the same port as HTTPS) which makes surface-level detection much harder, the use of a custom protocol may allow for detection on DPIs that are written to distinguish DNSCrypt's protocol from TLS/SSL protocol | ✅ A 3rd party adversary would not be able to detect DNS usage from the Tor/VPN traffic | ✅ The traffic from the local DNS server appears just like any other DNS query | | Anonymity | ✳️ The protocol does not offer built-in anonymity protection, but it can be used over Tor. | ✳️ The protocol does not offer built-in anonymity protection, but it can be used over Tor. | ✅ DNSCrypt has a feature called Anonymized DNS, where instead of connecting to a DNSCrypt server directly, a user can connect through a relay DNSCrypt server to relay data over to that server. | ✅ Tor offers anonymity protection (maybe same thing for VPN but a little different) | ❎️ Unencrypted authoritative DNS queries (done by the local DNS server) can allow the user to be deanonymized by a 3rd party adversary | +In conclusion: + +* If you want speed and privacy, use DNSCrypt +* If you want to be 100% undetectable, use DNS-over-HTTPS +* If you want anonymity, use DNS over Tor or Anonymized DNS in DNSCrypt + ## How to set up ### DNS over TLS @@ -301,7 +307,7 @@ routes = [ root@localhost:~# vim /etc/tor/torrc ``` - Add this to the file: + Add this at the end of the file: ``` DNSPort 53 @@ -328,24 +334,66 @@ routes = [ 5. Start up Tor. ```bash - root@localhost:~# systemctl start tor + root@localhost:~# systemctl enable --now tor ``` 6. Now try pinging a site to test out if the Tor DNS works. ```bash root@localhost:~# ping example.com - ``` - - If you get something like: - - ``` PING example.com (23.192.228.80) 56(84) bytes of data. 64 bytes from a23-192-228-80.deploy.static.akamaitechnologies.com (23.192.228.80): icmp_seq=1 ttl=255 time=190 ms 64 bytes from 23.192.228.80 (23.192.228.80): icmp_seq=2 ttl=255 time=190 ms ``` - Then, congratulations, Tor's DNS is now working. + If you get something like the above, then congratulations, Tor's DNS is now working. If it doesn't work or says something like `ping: example.com: Temporary failure in name resolution`, try restarting Tor and try again. +### Local DNS + +We'll be using `unbound` as our DNS resolver server. + +1. Install `unbound` + + ```bash + root@localhost:~# apt install unbound + ``` + +2. Disable any other DNS resolvers currently running. You can check with `ss -lp 'sport = :domain'`. + Our example machine is currently running `systemd-resolved`, so we will disable and stop that. + + ```bash + root@localhost:~# systemctl stop systemd-resolved + root@localhost:~# systemctl disable systemd-resolved + ``` + +3. Backup the existing `resolv.conf`, and make a new one configuring the system to resolve DNS queries through Tor + ```bash + root@localhost:~# mv /etc/resolv.conf /etc/resolv.conf.bak + root@localhost:~# vim /etc/resolv.conf + ``` + + The contents of `/etc/resolv.conf` should be written like this: + + ``` + nameserver 127.0.0.1 + ``` +4. Start up unbound. + + ```bash + root@localhost:~# systemctl enable --now unbound + ``` + +5. Now try pinging a site to test out if the local DNS works. + + ```bash + root@localhost:~# ping example.com + PING example.com (96.7.128.175) 56(84) bytes of data. + 64 bytes from a96-7-128-175.deploy.static.akamaitechnologies.com (96.7.128.175): icmp_seq=1 ttl=255 time=198 ms + 64 bytes from a96-7-128-175.deploy.static.akamaitechnologies.com (96.7.128.175): icmp_seq=2 ttl=255 time=197 ms + ``` + + If you get something like the above, then congratulations, unbound is now working. + + If it doesn't work or says something like `ping: example.com: Temporary failure in name resolution`, try restarting unbound and try again.