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nixos/initrd-network: add new module

nixos-19.03
Nikolay Amiantov 7 years ago
parent
commit
c81fb457c9
  1. 1
      nixos/modules/module-list.nix
  2. 149
      nixos/modules/system/boot/initrd-network.nix

1
nixos/modules/module-list.nix

@ -436,6 +436,7 @@
./system/activation/top-level.nix
./system/boot/coredump.nix
./system/boot/emergency-mode.nix
./system/boot/initrd-network.nix
./system/boot/kernel.nix
./system/boot/kexec.nix
./system/boot/loader/efi.nix

149
nixos/modules/system/boot/initrd-network.nix

@ -0,0 +1,149 @@
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.boot.initrd.network;
in
{
options = {
boot.initrd.network.enable = mkOption {
type = types.bool;
default = false;
description = ''
Add network connectivity support to initrd.
Network options are configured via <literal>ip</literal> kernel
option, according to the kernel documentation.
'';
};
boot.initrd.network.ssh.enable = mkOption {
type = types.bool;
default = false;
description = ''
Start SSH service during initrd boot. It can be used to debug failing
boot on a remote server, enter pasphrase for an encrypted partition etc.
Service is killed when stage-1 boot is finished.
'';
};
boot.initrd.network.ssh.port = mkOption {
type = types.int;
default = 22;
description = ''
Port on which SSH initrd service should listen.
'';
};
boot.initrd.network.ssh.shell = mkOption {
type = types.str;
default = "/bin/ash";
description = ''
Login shell of the remote user. Can be used to limit actions user can do.
'';
};
boot.initrd.network.ssh.hostRSAKey = mkOption {
type = types.nullOr types.path;
default = null;
description = ''
RSA SSH private key file in the Dropbear format.
WARNING: This key is contained insecurely in the global Nix store. Do NOT
use your regular SSH host private keys for this purpose or you'll expose
them to regular users!
'';
};
boot.initrd.network.ssh.hostDSSKey = mkOption {
type = types.nullOr types.path;
default = null;
description = ''
DSS SSH private key file in the Dropbear format.
WARNING: This key is contained insecurely in the global Nix store. Do NOT
use your regular SSH host private keys for this purpose or you'll expose
them to regular users!
'';
};
boot.initrd.network.ssh.hostECDSAKey = mkOption {
type = types.nullOr types.path;
default = null;
description = ''
ECDSA SSH private key file in the Dropbear format.
WARNING: This key is contained insecurely in the global Nix store. Do NOT
use your regular SSH host private keys for this purpose or you'll expose
them to regular users!
'';
};
boot.initrd.network.ssh.authorizedKeys = mkOption {
type = types.listOf types.str;
default = config.users.extraUsers.root.openssh.authorizedKeys.keys;
description = ''
Authorized keys for the root user on initrd.
'';
};
};
config = mkIf cfg.enable {
boot.initrd.kernelModules = [ "af_packet" ];
boot.initrd.extraUtilsCommands = ''
copy_bin_and_libs ${pkgs.mkinitcpio-nfs-utils}/bin/ipconfig
'' + optionalString cfg.ssh.enable ''
copy_bin_and_libs ${pkgs.dropbear}/bin/dropbear
cp -pv ${pkgs.glibc}/lib/libnss_files.so.* $out/lib
'';
boot.initrd.extraUtilsCommandsTest = optionalString cfg.ssh.enable ''
$out/bin/dropbear -V
'';
boot.initrd.postEarlyDeviceCommands = ''
# Search for interface definitions in command line
for o in $(cat /proc/cmdline); do
case $o in
ip=*)
ipconfig $o && hasNetwork=1
;;
esac
done
'' + optionalString cfg.ssh.enable ''
if [ -n "$hasNetwork" ]; then
mkdir /dev/pts
mount -t devpts devpts /dev/pts
mkdir -p /etc
echo 'root:x:0:0:root:/root:${cfg.ssh.shell}' > /etc/passwd
echo '${cfg.ssh.shell}' > /etc/shells
echo 'passwd: files' > /etc/nsswitch.conf
mkdir -p /var/log
touch /var/log/lastlog
mkdir -p /etc/dropbear
${optionalString (cfg.ssh.hostRSAKey != null) "ln -s ${cfg.ssh.hostRSAKey} /etc/dropbear/dropbear_rsa_host_key"}
${optionalString (cfg.ssh.hostDSSKey != null) "ln -s ${cfg.ssh.hostDSSKey} /etc/dropbear/dropbear_dss_host_key"}
${optionalString (cfg.ssh.hostECDSAKey != null) "ln -s ${cfg.ssh.hostECDSAKey} /etc/dropbear/dropbear_ecdsa_host_key"}
mkdir -p /root/.ssh
${concatStrings (map (key: ''
echo -n ${escapeShellArg key} >> /root/.ssh/authorized_keys
'') cfg.ssh.authorizedKeys)}
dropbear -s -j -k -E -m -p ${toString cfg.ssh.port}
fi
'';
};
}
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