Split the initrd sshd support into a separate module

Also, drop boot.initrd.postEarlyDeviceCommands since preLVMCommands
should work fine.
This commit is contained in:
Eelco Dolstra 2016-02-02 17:25:18 +01:00
parent a5d5736692
commit 901163c0c7
5 changed files with 144 additions and 114 deletions

View file

@ -460,10 +460,10 @@
./system/boot/coredump.nix
./system/boot/emergency-mode.nix
./system/boot/initrd-network.nix
./system/boot/initrd-ssh.nix
./system/boot/kernel.nix
./system/boot/kexec.nix
./system/boot/loader/efi.nix
./system/boot/loader/loader.nix
./system/boot/loader/generations-dir/generations-dir.nix
./system/boot/loader/generic-extlinux-compatible
./system/boot/loader/grub/grub.nix
@ -471,15 +471,16 @@
./system/boot/loader/grub/memtest.nix
./system/boot/loader/gummiboot/gummiboot.nix
./system/boot/loader/init-script/init-script.nix
./system/boot/loader/loader.nix
./system/boot/loader/raspberrypi/raspberrypi.nix
./system/boot/luksroot.nix
./system/boot/modprobe.nix
./system/boot/networkd.nix
./system/boot/resolved.nix
./system/boot/shutdown.nix
./system/boot/stage-1.nix
./system/boot/stage-2.nix
./system/boot/systemd.nix
./system/boot/networkd.nix
./system/boot/resolved.nix
./system/boot/timesyncd.nix
./system/boot/tmp.nix
./system/etc/etc.nix

View file

@ -3,9 +3,11 @@
with lib;
let
cfg = config.boot.initrd.network;
in
{
options = {
@ -21,75 +23,15 @@ in
'';
};
boot.initrd.network.ssh.enable = mkOption {
type = types.bool;
default = false;
boot.initrd.network.postCommands = mkOption {
default = "";
type = types.lines;
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.
Shell commands to be executed after stage 1 of the
boot has initialised the network.
'';
};
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.
'';
};
};
@ -99,17 +41,9 @@ in
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 = ''
boot.initrd.preLVMCommands = ''
# Search for interface definitions in command line
for o in $(cat /proc/cmdline); do
case $o in
@ -118,32 +52,10 @@ in
;;
esac
done
'' + optionalString cfg.ssh.enable ''
if [ -n "$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
${cfg.postCommands}
'';
};
}

View file

@ -0,0 +1,124 @@
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.boot.initrd.network.ssh;
in
{
options = {
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.extraUtilsCommands = ''
copy_bin_and_libs ${pkgs.dropbear}/bin/dropbear
cp -pv ${pkgs.glibc}/lib/libnss_files.so.* $out/lib
'';
boot.initrd.extraUtilsCommandsTest = ''
$out/bin/dropbear -V
'';
boot.initrd.network.postCommands = ''
if [ -n "$hasNetwork" ]; then
mkdir /dev/pts
mount -t devpts devpts /dev/pts
echo '${cfg.shell}' > /etc/shells
mkdir -p /var/log
touch /var/log/lastlog
mkdir -p /etc/dropbear
${optionalString (cfg.hostRSAKey != null) "ln -s ${cfg.hostRSAKey} /etc/dropbear/dropbear_rsa_host_key"}
${optionalString (cfg.hostDSSKey != null) "ln -s ${cfg.hostDSSKey} /etc/dropbear/dropbear_dss_host_key"}
${optionalString (cfg.hostECDSAKey != null) "ln -s ${cfg.hostECDSAKey} /etc/dropbear/dropbear_ecdsa_host_key"}
mkdir -p /root/.ssh
${concatStrings (map (key: ''
echo -n ${escapeShellArg key} >> /root/.ssh/authorized_keys
'') cfg.authorizedKeys)}
dropbear -s -j -k -E -m -p ${toString cfg.port}
fi
'';
};
}

View file

@ -72,6 +72,11 @@ mkdir -p /run
mount -t tmpfs -o "mode=0755,size=@runSize@" tmpfs /run
# Initialise /etc.
echo 'root:x:0:0:root:/root:${cfg.shell}' > /etc/passwd
echo 'passwd: files' > /etc/nsswitch.conf
# Process the kernel command line.
export stage2Init=/init
for o in $(cat /proc/cmdline); do
@ -150,10 +155,6 @@ udevadm trigger --action=add
udevadm settle
# Additional devices initialization.
@postEarlyDeviceCommands@
# Load boot-time keymap before any LVM/LUKS initialization
@extraUtils@/bin/busybox loadkmap < "@busyboxKeymap@"

View file

@ -199,7 +199,7 @@ let
inherit (config.boot) resumeDevice devSize runSize;
inherit (config.boot.initrd) checkJournalingFS
preLVMCommands preDeviceCommands postEarlyDeviceCommands postDeviceCommands postMountCommands kernelModules;
preLVMCommands preDeviceCommands postDeviceCommands postMountCommands kernelModules;
resumeDevices = map (sd: if sd ? device then sd.device else "/dev/disk/by-label/${sd.label}")
(filter (sd: (sd ? label || hasPrefix "/dev/" sd.device) && !sd.randomEncryption) config.swapDevices);
@ -318,14 +318,6 @@ in
'';
};
boot.initrd.postEarlyDeviceCommands = mkOption {
default = "";
type = types.lines;
description = ''
Shell commands to be executed early after creation of device nodes.
'';
};
boot.initrd.postMountCommands = mkOption {
default = "";
type = types.lines;