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|
{ config, lib, ... }:
with lib;
let
cfg = config.nixfiles.modules.openssh;
in
{
options.nixfiles.modules.openssh.server = {
enable = mkEnableOption "OpenSSH server";
port = mkOption {
description = "OpenSSH server port.";
type = types.port;
default = 22022; # Port 22 should be occupied by a tarpit.
};
};
config = mkIf cfg.server.enable {
ark.files = [
"/etc/ssh/ssh_host_ed25519_key"
"/etc/ssh/ssh_host_ed25519_key.pub"
"/etc/ssh/ssh_host_rsa_key"
"/etc/ssh/ssh_host_rsa_key.pub"
];
programs.mosh.enable = true;
services = {
openssh = {
enable = true;
ports = [ cfg.server.port ];
settings = {
ClientAliveCountMax = 3;
ClientAliveInterval = 60;
KbdInteractiveAuthentication = false;
LogLevel = if config.nixfiles.modules.fail2ban.enable then "VERBOSE" else "ERROR";
MaxAuthTries = 3;
PasswordAuthentication = false;
PermitRootLogin = mkForce "no";
};
};
fail2ban.jails.sshd = {
enabled = true;
settings = {
mode = "aggressive";
inherit (cfg.server) port;
};
};
};
};
}
|
