nixos-config/modules/init-ssh.nix
2024-06-07 22:56:52 +02:00

105 lines
2.9 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.configuration.init-ssh;
in
{
# todo : this is kinda deprecated. It should be replaced some day with something more simple, and put in a module.
options.configuration.init-ssh = {
enable = mkOption {
default = "disable";
type = with types; enum [ "disable" "prepare" "enabled" ];
};
kernelModules = mkOption {
type = with types; listOf str;
description =
"lspci -v will tell you which kernel module is used for the ethernet interface";
};
port = mkOption {
default = 2222;
type = with types; int;
};
authorizedKeys = mkOption {
type = with types; listOf str;
default = config.users.users.root.openssh.authorizedKeys.keys
++ (map (keyFile: lib.fileContents keyFile)
config.users.users.root.openssh.authorizedKeys.keyFiles);
};
hostKey = mkOption {
default = "/etc/secrets/initrd/ssh_host_ed25519_key";
type = with types; path;
description = ''
To generate keys, use ssh-keygen(1):
# ssh-keygen -t rsa -N "" -f /etc/secrets/initrd/ssh_host_rsa_key
# ssh-keygen -t ed25519 -N "" -f /etc/secrets/initrd/ssh_host_ed25519_key
'';
};
};
config = mkMerge [
(mkIf (cfg.enable != "disable") {
services.tor = {
enable = true;
client.enable = true;
relay.onionServices.bootup.map = [{ port = 22; }];
};
})
(mkIf (cfg.enable == "enabled") {
# tor setup
boot.initrd.secrets = {
"/etc/tor/onion/bootup" = /var/lib/tor/onion/bootup;
};
boot.initrd.extraUtilsCommands = ''
copy_bin_and_libs ${pkgs.tor}/bin/tor
'';
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
''
echo "tor: preparing onion folder"
# have to do this otherwise tor does not want to start
chmod -R 700 /etc/tor
echo "make sure localhost is up"
ip a a 127.0.0.1/8 dev lo
# ifconfig lo up
ip link set lo up
echo "tor: starting tor"
tor -f ${torRc} --verify-config
tor -f ${torRc} &
'';
# 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;
hostKeys = [ cfg.hostKey ];
};
boot.initrd.availableKernelModules = cfg.kernelModules;
})
];
}