mirror of
https://gitea.blesmrt.net/mikaela/shell-things.git
synced 2024-12-29 14:13:02 +01:00
37 lines
1.7 KiB
Markdown
37 lines
1.7 KiB
Markdown
## systemd-resolved additional config files
|
|
|
|
### Files explained
|
|
|
|
* 00-everywhere.conf - configuration that doesn't affect DNS servers, attempts
|
|
to use DNSSEC and DoT and if it fails, doesn't care and uses insecure
|
|
configuration.
|
|
* quad9-compat.conf - non-tech person config for Quad9, same as above except
|
|
specifies the server.
|
|
* quad9-strict.conf - tech person config demanding DNSSEC and DoT from Quad9
|
|
* README.md - you are reading it right now.
|
|
|
|
### General commentary
|
|
|
|
I have moved duplicate comments to this file, so it will possibly look weird
|
|
or miss original context.
|
|
|
|
* Based on my test DNSOverTLS is not supported in Ubuntu 18.04.x LTS (however
|
|
at the time of writing this README.md, the current version is Ubuntu 20.04.0)
|
|
(systemd v237). DNSOverTLS became supported in v239, strict mode (yes) in
|
|
v243 (big improvements in v244).
|
|
* TODO: find out when SNI became supported, I have just spotted it in the
|
|
fine manual in 2020-06-??.
|
|
* Domains has to be `.~` for them to override DHCP. See https://www.internetsociety.org/blog/2018/12/dns-privacy-in-linux-systemd
|
|
without which I wouldn't have got this right.
|
|
* DNSSEC may not work if the system is down for a long time and not updated.
|
|
Thus `allow-downgrade` may be better for non-tech people, even with the
|
|
potential downgrade attack. There are also captive portals, affecting
|
|
`DNSOverTLS`. Both take `true` or `false` or their own special option,
|
|
for DNNSEC the `allow-downgrade`, for DNSOverTLS `opportunistic`.
|
|
|
|
Other links I have found important and my files are based on:
|
|
|
|
* https://wiki.archlinux.org/index.php/Systemd-resolved
|
|
* request for strict DOT: https://github.com/systemd/systemd/issues/10755
|
|
* vulnerable to MITM: https://github.com/systemd/systemd/issues/9397
|