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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 {
# authorized_keys is not added here because it only contains my SSH keys and
# all non-declarative ones are located in the home directory.
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
mode = aggressive
port = ${toString cfg.server.port}
'';
};
};
}
|
