87 lines
2.7 KiB
Nix
87 lines
2.7 KiB
Nix
{ config, lib, ... }:
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with lib;
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let
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fileSystems = config.system.build.fileSystems ++ config.swapDevices;
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encDevs = filter (dev: dev.encrypted.enable) fileSystems;
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keyedEncDevs = filter (dev: dev.encrypted.keyFile != null) encDevs;
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keylessEncDevs = filter (dev: dev.encrypted.keyFile == null) encDevs;
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anyEncrypted =
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fold (j: v: v || j.encrypted.enable) false encDevs;
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encryptedFSOptions = {
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options.encrypted = {
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enable = mkOption {
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default = false;
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type = types.bool;
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description = "The block device is backed by an encrypted one, adds this device as a initrd luks entry.";
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};
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blkDev = mkOption {
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default = null;
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example = "/dev/sda1";
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type = types.nullOr types.str;
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description = "Location of the backing encrypted device.";
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};
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label = mkOption {
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default = null;
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example = "rootfs";
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type = types.nullOr types.str;
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description = "Label of the unlocked encrypted device. Set <literal>fileSystems.<name?>.device</literal> to <literal>/dev/mapper/<label></literal> to mount the unlocked device.";
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};
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keyFile = mkOption {
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default = null;
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example = "/mnt-root/root/.swapkey";
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type = types.nullOr types.str;
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description = ''
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Path to a keyfile used to unlock the backing encrypted
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device. At the time this keyfile is accessed, the
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<literal>neededForBoot</literal> filesystems (see
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<literal>fileSystems.<name?>.neededForBoot</literal>)
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will have been mounted under <literal>/mnt-root</literal>,
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so the keyfile path should usually start with "/mnt-root/".
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'';
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};
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};
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};
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in
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{
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options = {
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fileSystems = mkOption {
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type = with lib.types; loaOf (submodule encryptedFSOptions);
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};
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swapDevices = mkOption {
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type = with lib.types; listOf (submodule encryptedFSOptions);
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};
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};
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config = mkIf anyEncrypted {
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assertions = map (dev: {
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assertion = dev.encrypted.label != null;
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message = ''
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The filesystem for ${dev.mountPoint} has encrypted.enable set to true, but no encrypted.label set
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'';
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}) encDevs;
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boot.initrd = {
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luks = {
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devices =
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builtins.listToAttrs (map (dev: {
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name = dev.encrypted.label;
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value = { device = dev.encrypted.blkDev; };
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}) keylessEncDevs);
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forceLuksSupportInInitrd = true;
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};
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postMountCommands =
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concatMapStrings (dev:
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"cryptsetup luksOpen --key-file ${dev.encrypted.keyFile} ${dev.encrypted.blkDev} ${dev.encrypted.label};\n"
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) keyedEncDevs;
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};
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};
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}
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