nixos-config/components/network/sshd/default.nix

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{ pkgs, config, lib, assets, ... }:
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with lib;
with types;
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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in
{
imports = [
./known-hosts-public.nix
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./known-hosts-manual.nix
./known-hosts-zerotier.nix
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];
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options.components.network.sshd = {
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enable = mkOption {
type = bool;
default = true;
};
rootKeyFiles = mkOption {
type = with types; listOf path;
default = [ ];
description = "keys to root login";
};
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sshguard.enable = mkOption {
type = bool;
default = config.components.network.sshd.enable;
};
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onlyTincAccess = mkOption {
type = bool;
default = false;
description = ''
make sure ssh is only available trough the tinc
'';
};
};
config = mkMerge [
(mkIf cfg.enable {
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environment.systemPackages = [
pkgs.sshfs
pkgs.mosh
];
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services.openssh = {
enable = true;
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settings.X11Forwarding = false;
settings.PasswordAuthentication = false;
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# We might want to remove this once, openssh is fixed everywhere:
# Workaround for CVE-2024-6387 and CVE-2024-6409
# 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
#services.openssh.banner = builtins.readFile sshBanner;
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})
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(mkIf cfg.sshguard.enable {
environment.systemPackages = [ pkgs.ipset ];
services.sshguard.enable = lib.mkDefault true;
#boot.kernelModules = ["xt_set"];
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})
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(mkIf (cfg.onlyTincAccess && cfg.enable) {
networking.firewall.extraCommands = ''
iptables --table nat --append PREROUTING ! --in-interface tinc.+ --protocol tcp --match tcp --dport 22 --jump REDIRECT --to-ports 0
'';
})
];
}