87 lines
2.2 KiB
Nix
87 lines
2.2 KiB
Nix
{ pkgs, config, lib, assets, ... }:
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with lib;
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with types;
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let
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defaultRootKeyFiles = [ "${assets}/mrvandalo_rsa.pub" ];
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cfg = config.components.network.sshd;
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# maybe ascii-image-converter is also nice here
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sshBanner = pkgs.runCommand "ssh-banner"
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{ nativeBuildInputs = [ pkgs.boxes ]; } ''
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echo "${config.networking.hostName}" | boxes -d ansi -s 80x1 -a r > $out
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'';
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in
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{
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imports = [
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./known-hosts-public.nix
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./known-hosts-manual.nix
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./known-hosts-zerotier.nix
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];
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options.components.network.sshd = {
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enable = mkOption {
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type = bool;
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default = true;
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};
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rootKeyFiles = mkOption {
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type = with types; listOf path;
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default = [ ];
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description = "keys to root login";
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};
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sshguard.enable = mkOption {
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type = bool;
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default = config.components.network.sshd.enable;
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};
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onlyTincAccess = mkOption {
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type = bool;
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default = false;
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description = ''
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make sure ssh is only available trough the tinc
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'';
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};
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};
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config = mkMerge [
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(mkIf cfg.enable {
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environment.systemPackages = [
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pkgs.sshfs
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pkgs.mosh
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];
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services.openssh = {
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enable = true;
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settings.X11Forwarding = false;
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settings.PasswordAuthentication = false;
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# We might want to remove this once, openssh is fixed everywhere:
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# Workaround for CVE-2024-6387 and CVE-2024-6409
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# https://github.com/NixOS/nixpkgs/pull/323753#issuecomment-2199762128
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settings.LoginGraceTime = 0;
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};
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users.users.root.openssh.authorizedKeys.keyFiles = cfg.rootKeyFiles ++ defaultRootKeyFiles;
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# todo enable again when I can it's possible to set the `-q` ssh option in clan
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#services.openssh.banner = builtins.readFile sshBanner;
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})
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(mkIf cfg.sshguard.enable {
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environment.systemPackages = [ pkgs.ipset ];
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services.sshguard.enable = lib.mkDefault true;
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})
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(mkIf (cfg.onlyTincAccess && cfg.enable) {
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networking.firewall.extraCommands = ''
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iptables --table nat --append PREROUTING ! --in-interface tinc.+ --protocol tcp --match tcp --dport 22 --jump REDIRECT --to-ports 0
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'';
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})
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];
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}
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