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