forked from pub-solar/infra
45 lines
1.7 KiB
Nix
45 lines
1.7 KiB
Nix
{ pkgs, lib, ... }: {
|
|
# Don't expose SSH via public interfaces
|
|
networking.firewall.interfaces.wg-ssh.allowedTCPPorts = [ 22 ];
|
|
|
|
services.openssh = {
|
|
enable = true;
|
|
openFirewall = lib.mkDefault false;
|
|
settings = {
|
|
PermitRootLogin = "prohibit-password";
|
|
PasswordAuthentication = false;
|
|
# Add back openssh MACs that got removed from defaults
|
|
# for backwards compatibility
|
|
#
|
|
# NixOS default openssh MACs have changed to use "encrypt-then-mac" only.
|
|
# This breaks compatibilty with clients that do not offer these MACs. For
|
|
# compatibility reasons, we add back the old defaults.
|
|
# See: https://github.com/NixOS/nixpkgs/pull/231165
|
|
#
|
|
# https://blog.stribik.technology/2015/01/04/secure-secure-shell.html
|
|
# https://infosec.mozilla.org/guidelines/openssh#modern-openssh-67
|
|
Macs = [
|
|
"hmac-sha2-512-etm@openssh.com"
|
|
"hmac-sha2-256-etm@openssh.com"
|
|
"umac-128-etm@openssh.com"
|
|
"hmac-sha2-512"
|
|
"hmac-sha2-256"
|
|
"umac-128@openssh.com"
|
|
];
|
|
};
|
|
};
|
|
|
|
services.resolved = {
|
|
enable = true;
|
|
# DNSSEC=false because of random SERVFAIL responses with Greenbaum DNS
|
|
# when using allow-downgrade, see https://github.com/systemd/systemd/issues/10579
|
|
extraConfig = ''
|
|
DNS=193.110.81.0#dns0.eu 185.253.5.0#dns0.eu 2a0f:fc80::#dns0.eu 2a0f:fc81::#dns0.eu 9.9.9.9#dns.quad9.net 149.112.112.112#dns.quad9.net 2620:fe::fe#dns.quad9.net 2620:fe::9#dns.quad9.net
|
|
FallbackDNS=5.1.66.255#dot.ffmuc.net 185.150.99.255#dot.ffmuc.net 2001:678:e68:f000::#dot.ffmuc.net 2001:678:ed0:f000::#dot.ffmuc.net
|
|
Domains=~.
|
|
DNSOverTLS=yes
|
|
DNSSEC=false
|
|
'';
|
|
};
|
|
}
|