{ pkgs, lib, ... }: { # Don't expose SSH via public interfaces networking.firewall.interfaces.wg-ssh.allowedTCPPorts = [ 22 ]; networking.hosts = { "10.7.6.1" = ["nachtigall.pub.solar"]; "10.7.6.2" = ["flora-6.pub.solar"]; }; 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; 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 ''; }; }