nixos-config/system/server/initssh.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.configuration.init-ssh;
in {
options.configuration.init-ssh = {
enable = mkOption {
default = "disable";
type = with types; enum [ "disable" "prepare" "enabled" ];
};
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kernelModules = mkOption { type = with types; listOf str; };
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port = mkOption {
default = 23;
type = with types; int;
};
authorizedKeys = mkOption {
type = with types; listOf str;
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default = config.users.users.root.openssh.authorizedKeys.keys
++ (map (keyFile: lib.fileContents keyFile)
config.users.users.root.openssh.authorizedKeys.keyFiles);
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};
hostECDSAKey = mkOption {
default = null;
type = with types; nullOr path;
description = ''
you only need one host key
nix-shell -p dropbear --run "dropbearkey -t ecdsa -f ./host_ecdsa_key"
'';
};
};
config = mkMerge [
(mkIf (cfg.enable != "disable") {
services.tor = {
enable = true;
client.enable = true;
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hiddenServices.bootup.map = [{ port = 23; }];
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};
})
(mkIf (cfg.enable == "enabled") {
# tor setup
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boot.initrd.secrets = {
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"/etc/tor/onion/bootup" = /var/lib/tor/onion/bootup;
};
boot.initrd.extraUtilsCommands = ''
copy_bin_and_libs ${pkgs.tor}/bin/tor
'';
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boot.initrd.network.postCommands = let
torRc = (pkgs.writeText "tor.rc" ''
DataDirectory /etc/tor
SOCKSPort 127.0.0.1:9050 IsolateDestAddr
SOCKSPort 127.0.0.1:9063
HiddenServiceDir /etc/tor/onion/bootup
HiddenServicePort ${toString cfg.port} 127.0.0.1:${toString cfg.port}
'');
in ''
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echo "tor: preparing onion folder"
# have to do this otherwise tor does not want to start
chmod -R 700 /etc/tor
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echo "make sure localhost is up"
ip a a 127.0.0.1/8 dev lo
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# ifconfig lo up
ip link set lo up
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echo "tor: starting tor"
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tor -f ${torRc} --verify-config
tor -f ${torRc} &
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'';
# ssh setup
# todo add the ssh host fingerprint to your trusted stuff
# todo set ssh host key here
boot.initrd.network.enable = true;
boot.initrd.network.ssh = {
enable = true;
authorizedKeys = cfg.authorizedKeys;
port = cfg.port;
};
boot.initrd.availableKernelModules = cfg.kernelModules;
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#boot.initrd.network.ssh.hostECDSAKey = cfg.hostECDSAKey;
boot.initrd.network.ssh.hostKeys = [ cfg.hostECDSAKey ];
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})
];
}