1080 lines
39 KiB
Nix
1080 lines
39 KiB
Nix
{ config, options, lib, pkgs, ... }:
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with lib;
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let
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luks = config.boot.initrd.luks;
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kernelPackages = config.boot.kernelPackages;
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defaultPrio = (mkOptionDefault {}).priority;
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commonFunctions = ''
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die() {
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echo "$@" >&2
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exit 1
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}
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dev_exist() {
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local target="$1"
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if [ -e $target ]; then
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return 0
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else
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local uuid=$(echo -n $target | sed -e 's,UUID=\(.*\),\1,g')
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blkid --uuid $uuid >/dev/null
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return $?
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fi
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}
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wait_target() {
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local name="$1"
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local target="$2"
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local secs="''${3:-10}"
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local desc="''${4:-$name $target to appear}"
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if ! dev_exist $target; then
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echo -n "Waiting $secs seconds for $desc..."
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local success=false;
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for try in $(seq $secs); do
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echo -n "."
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sleep 1
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if dev_exist $target; then
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success=true
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break
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fi
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done
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if [ $success == true ]; then
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echo " - success";
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return 0
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else
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echo " - failure";
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return 1
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fi
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fi
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return 0
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}
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wait_yubikey() {
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local secs="''${1:-10}"
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ykinfo -v 1>/dev/null 2>&1
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if [ $? != 0 ]; then
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echo -n "Waiting $secs seconds for YubiKey to appear..."
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local success=false
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for try in $(seq $secs); do
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echo -n .
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sleep 1
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ykinfo -v 1>/dev/null 2>&1
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if [ $? == 0 ]; then
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success=true
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break
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fi
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done
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if [ $success == true ]; then
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echo " - success";
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return 0
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else
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echo " - failure";
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return 1
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fi
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fi
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return 0
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}
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wait_gpgcard() {
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local secs="''${1:-10}"
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gpg --card-status > /dev/null 2> /dev/null
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if [ $? != 0 ]; then
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echo -n "Waiting $secs seconds for GPG Card to appear"
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local success=false
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for try in $(seq $secs); do
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echo -n .
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sleep 1
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gpg --card-status > /dev/null 2> /dev/null
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if [ $? == 0 ]; then
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success=true
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break
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fi
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done
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if [ $success == true ]; then
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echo " - success";
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return 0
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else
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echo " - failure";
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return 1
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fi
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fi
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return 0
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}
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'';
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preCommands = ''
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# A place to store crypto things
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# A ramfs is used here to ensure that the file used to update
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# the key slot with cryptsetup will never get swapped out.
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# Warning: Do NOT replace with tmpfs!
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mkdir -p /crypt-ramfs
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mount -t ramfs none /crypt-ramfs
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# Cryptsetup locking directory
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mkdir -p /run/cryptsetup
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# For YubiKey salt storage
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mkdir -p /crypt-storage
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${optionalString luks.gpgSupport ''
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export GPG_TTY=$(tty)
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export GNUPGHOME=/crypt-ramfs/.gnupg
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gpg-agent --daemon --scdaemon-program $out/bin/scdaemon > /dev/null 2> /dev/null
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''}
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# Disable all input echo for the whole stage. We could use read -s
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# instead but that would occasionally leak characters between read
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# invocations.
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stty -echo
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'';
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postCommands = ''
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stty echo
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umount /crypt-storage 2>/dev/null
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umount /crypt-ramfs 2>/dev/null
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'';
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openCommand = name: dev: assert name == dev.name;
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let
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csopen = "cryptsetup luksOpen ${dev.device} ${dev.name}"
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+ optionalString dev.allowDiscards " --allow-discards"
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+ optionalString dev.bypassWorkqueues " --perf-no_read_workqueue --perf-no_write_workqueue"
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+ optionalString (dev.header != null) " --header=${dev.header}";
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cschange = "cryptsetup luksChangeKey ${dev.device} ${optionalString (dev.header != null) "--header=${dev.header}"}";
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fido2luksCredentials = dev.fido2.credentials ++ optional (dev.fido2.credential != null) dev.fido2.credential;
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in ''
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# Wait for luksRoot (and optionally keyFile and/or header) to appear, e.g.
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# if on a USB drive.
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wait_target "device" ${dev.device} || die "${dev.device} is unavailable"
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${optionalString (dev.header != null) ''
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wait_target "header" ${dev.header} || die "${dev.header} is unavailable"
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''}
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try_empty_passphrase() {
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${if dev.tryEmptyPassphrase then ''
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echo "Trying empty passphrase!"
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echo "" | ${csopen}
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cs_status=$?
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if [ $cs_status -eq 0 ]; then
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return 0
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else
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return 1
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fi
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'' else "return 1"}
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}
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do_open_passphrase() {
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local passphrase
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while true; do
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echo -n "Passphrase for ${dev.device}: "
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passphrase=
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while true; do
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if [ -e /crypt-ramfs/passphrase ]; then
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echo "reused"
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passphrase=$(cat /crypt-ramfs/passphrase)
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break
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else
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# ask cryptsetup-askpass
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echo -n "${dev.device}" > /crypt-ramfs/device
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# and try reading it from /dev/console with a timeout
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IFS= read -t 1 -r passphrase
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if [ -n "$passphrase" ]; then
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${if luks.reusePassphrases then ''
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# remember it for the next device
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echo -n "$passphrase" > /crypt-ramfs/passphrase
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'' else ''
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# Don't save it to ramfs. We are very paranoid
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''}
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echo
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break
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fi
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fi
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done
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echo -n "Verifying passphrase for ${dev.device}..."
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echo -n "$passphrase" | ${csopen} --key-file=-
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if [ $? == 0 ]; then
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echo " - success"
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${if luks.reusePassphrases then ''
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# we don't rm here because we might reuse it for the next device
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'' else ''
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rm -f /crypt-ramfs/passphrase
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''}
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break
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else
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echo " - failure"
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# ask for a different one
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rm -f /crypt-ramfs/passphrase
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fi
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done
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}
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# LUKS
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open_normally() {
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${if (dev.keyFile != null) then ''
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if wait_target "key file" ${dev.keyFile}; then
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${csopen} --key-file=${dev.keyFile} \
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${optionalString (dev.keyFileSize != null) "--keyfile-size=${toString dev.keyFileSize}"} \
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${optionalString (dev.keyFileOffset != null) "--keyfile-offset=${toString dev.keyFileOffset}"}
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cs_status=$?
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if [ $cs_status -ne 0 ]; then
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echo "Key File ${dev.keyFile} failed!"
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if ! try_empty_passphrase; then
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${if dev.fallbackToPassword then "echo" else "die"} "${dev.keyFile} is unavailable"
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echo " - failing back to interactive password prompt"
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do_open_passphrase
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fi
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fi
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else
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# If the key file never shows up we should also try the empty passphrase
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if ! try_empty_passphrase; then
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${if dev.fallbackToPassword then "echo" else "die"} "${dev.keyFile} is unavailable"
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echo " - failing back to interactive password prompt"
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do_open_passphrase
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fi
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fi
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'' else ''
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if ! try_empty_passphrase; then
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do_open_passphrase
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fi
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''}
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}
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${optionalString (luks.yubikeySupport && (dev.yubikey != null)) ''
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# YubiKey
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rbtohex() {
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( od -An -vtx1 | tr -d ' \n' )
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}
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hextorb() {
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( tr '[:lower:]' '[:upper:]' | sed -e 's/\([0-9A-F]\{2\}\)/\\\\\\x\1/gI' | xargs printf )
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}
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do_open_yubikey() {
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# Make all of these local to this function
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# to prevent their values being leaked
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local salt
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local iterations
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local k_user
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local challenge
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local response
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local k_luks
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local opened
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local new_salt
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local new_iterations
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local new_challenge
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local new_response
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local new_k_luks
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mount -t ${dev.yubikey.storage.fsType} ${dev.yubikey.storage.device} /crypt-storage || \
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die "Failed to mount YubiKey salt storage device"
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salt="$(cat /crypt-storage${dev.yubikey.storage.path} | sed -n 1p | tr -d '\n')"
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iterations="$(cat /crypt-storage${dev.yubikey.storage.path} | sed -n 2p | tr -d '\n')"
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challenge="$(echo -n $salt | openssl-wrap dgst -binary -sha512 | rbtohex)"
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response="$(ykchalresp -${toString dev.yubikey.slot} -x $challenge 2>/dev/null)"
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for try in $(seq 3); do
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${optionalString dev.yubikey.twoFactor ''
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echo -n "Enter two-factor passphrase: "
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k_user=
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while true; do
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if [ -e /crypt-ramfs/passphrase ]; then
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echo "reused"
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k_user=$(cat /crypt-ramfs/passphrase)
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break
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else
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# Try reading it from /dev/console with a timeout
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IFS= read -t 1 -r k_user
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if [ -n "$k_user" ]; then
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${if luks.reusePassphrases then ''
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# Remember it for the next device
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echo -n "$k_user" > /crypt-ramfs/passphrase
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'' else ''
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# Don't save it to ramfs. We are very paranoid
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''}
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echo
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break
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fi
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fi
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done
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''}
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if [ ! -z "$k_user" ]; then
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k_luks="$(echo -n $k_user | pbkdf2-sha512 ${toString dev.yubikey.keyLength} $iterations $response | rbtohex)"
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else
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k_luks="$(echo | pbkdf2-sha512 ${toString dev.yubikey.keyLength} $iterations $response | rbtohex)"
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fi
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echo -n "$k_luks" | hextorb | ${csopen} --key-file=-
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if [ $? == 0 ]; then
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opened=true
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${if luks.reusePassphrases then ''
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# We don't rm here because we might reuse it for the next device
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'' else ''
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rm -f /crypt-ramfs/passphrase
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''}
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break
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else
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opened=false
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echo "Authentication failed!"
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fi
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done
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[ "$opened" == false ] && die "Maximum authentication errors reached"
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echo -n "Gathering entropy for new salt (please enter random keys to generate entropy if this blocks for long)..."
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for i in $(seq ${toString dev.yubikey.saltLength}); do
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byte="$(dd if=/dev/random bs=1 count=1 2>/dev/null | rbtohex)";
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new_salt="$new_salt$byte";
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echo -n .
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done;
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echo "ok"
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new_iterations="$iterations"
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${optionalString (dev.yubikey.iterationStep > 0) ''
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new_iterations="$(($new_iterations + ${toString dev.yubikey.iterationStep}))"
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''}
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new_challenge="$(echo -n $new_salt | openssl-wrap dgst -binary -sha512 | rbtohex)"
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new_response="$(ykchalresp -${toString dev.yubikey.slot} -x $new_challenge 2>/dev/null)"
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if [ ! -z "$k_user" ]; then
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new_k_luks="$(echo -n $k_user | pbkdf2-sha512 ${toString dev.yubikey.keyLength} $new_iterations $new_response | rbtohex)"
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else
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new_k_luks="$(echo | pbkdf2-sha512 ${toString dev.yubikey.keyLength} $new_iterations $new_response | rbtohex)"
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fi
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echo -n "$new_k_luks" | hextorb > /crypt-ramfs/new_key
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echo -n "$k_luks" | hextorb | ${cschange} --key-file=- /crypt-ramfs/new_key
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if [ $? == 0 ]; then
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echo -ne "$new_salt\n$new_iterations" > /crypt-storage${dev.yubikey.storage.path}
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sync /crypt-storage${dev.yubikey.storage.path}
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else
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echo "Warning: Could not update LUKS key, current challenge persists!"
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fi
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rm -f /crypt-ramfs/new_key
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umount /crypt-storage
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}
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open_with_hardware() {
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if wait_yubikey ${toString dev.yubikey.gracePeriod}; then
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do_open_yubikey
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else
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echo "No YubiKey found, falling back to non-YubiKey open procedure"
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open_normally
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fi
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}
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''}
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${optionalString (luks.gpgSupport && (dev.gpgCard != null)) ''
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do_open_gpg_card() {
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# Make all of these local to this function
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# to prevent their values being leaked
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local pin
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local opened
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gpg --import /gpg-keys/${dev.device}/pubkey.asc > /dev/null 2> /dev/null
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gpg --card-status > /dev/null 2> /dev/null
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for try in $(seq 3); do
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echo -n "PIN for GPG Card associated with device ${dev.device}: "
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pin=
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while true; do
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if [ -e /crypt-ramfs/passphrase ]; then
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echo "reused"
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pin=$(cat /crypt-ramfs/passphrase)
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break
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else
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# and try reading it from /dev/console with a timeout
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IFS= read -t 1 -r pin
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if [ -n "$pin" ]; then
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${if luks.reusePassphrases then ''
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# remember it for the next device
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echo -n "$pin" > /crypt-ramfs/passphrase
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'' else ''
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# Don't save it to ramfs. We are very paranoid
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''}
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echo
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break
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fi
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fi
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done
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echo -n "Verifying passphrase for ${dev.device}..."
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echo -n "$pin" | gpg -q --batch --passphrase-fd 0 --pinentry-mode loopback -d /gpg-keys/${dev.device}/cryptkey.gpg 2> /dev/null | ${csopen} --key-file=- > /dev/null 2> /dev/null
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if [ $? == 0 ]; then
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echo " - success"
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${if luks.reusePassphrases then ''
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# we don't rm here because we might reuse it for the next device
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'' else ''
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rm -f /crypt-ramfs/passphrase
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''}
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break
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else
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echo " - failure"
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# ask for a different one
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rm -f /crypt-ramfs/passphrase
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fi
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done
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[ "$opened" == false ] && die "Maximum authentication errors reached"
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}
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open_with_hardware() {
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if wait_gpgcard ${toString dev.gpgCard.gracePeriod}; then
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do_open_gpg_card
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else
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echo "No GPG Card found, falling back to normal open procedure"
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open_normally
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fi
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}
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''}
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${optionalString (luks.fido2Support && fido2luksCredentials != []) ''
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open_with_hardware() {
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local passsphrase
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${if dev.fido2.passwordLess then ''
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export passphrase=""
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'' else ''
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read -rsp "FIDO2 salt for ${dev.device}: " passphrase
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echo
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''}
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${optionalString (lib.versionOlder kernelPackages.kernel.version "5.4") ''
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echo "On systems with Linux Kernel < 5.4, it might take a while to initialize the CRNG, you might want to use linuxPackages_latest."
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echo "Please move your mouse to create needed randomness."
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''}
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echo "Waiting for your FIDO2 device..."
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fido2luks open${optionalString dev.allowDiscards " --allow-discards"} ${dev.device} ${dev.name} "${builtins.concatStringsSep "," fido2luksCredentials}" --await-dev ${toString dev.fido2.gracePeriod} --salt string:$passphrase
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if [ $? -ne 0 ]; then
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echo "No FIDO2 key found, falling back to normal open procedure"
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open_normally
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fi
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}
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''}
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# commands to run right before we mount our device
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${dev.preOpenCommands}
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${if (luks.yubikeySupport && (dev.yubikey != null)) || (luks.gpgSupport && (dev.gpgCard != null)) || (luks.fido2Support && fido2luksCredentials != []) then ''
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open_with_hardware
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'' else ''
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open_normally
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''}
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# commands to run right after we mounted our device
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${dev.postOpenCommands}
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'';
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askPass = pkgs.writeScriptBin "cryptsetup-askpass" ''
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#!/bin/sh
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${commonFunctions}
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while true; do
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wait_target "luks" /crypt-ramfs/device 10 "LUKS to request a passphrase" || die "Passphrase is not requested now"
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device=$(cat /crypt-ramfs/device)
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echo -n "Passphrase for $device: "
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IFS= read -rs passphrase
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echo
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rm /crypt-ramfs/device
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echo -n "$passphrase" > /crypt-ramfs/passphrase
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done
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'';
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preLVM = filterAttrs (n: v: v.preLVM) luks.devices;
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postLVM = filterAttrs (n: v: !v.preLVM) luks.devices;
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stage1Crypttab = pkgs.writeText "initrd-crypttab" (lib.concatStringsSep "\n" (lib.mapAttrsToList (n: v: let
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opts = v.crypttabExtraOpts
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++ optional v.allowDiscards "discard"
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++ optionals v.bypassWorkqueues [ "no-read-workqueue" "no-write-workqueue" ]
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++ optional (v.header != null) "header=${v.header}"
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++ optional (v.keyFileOffset != null) "keyfile-offset=${toString v.keyFileOffset}"
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++ optional (v.keyFileSize != null) "keyfile-size=${toString v.keyFileSize}"
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++ optional (v.keyFileTimeout != null) "keyfile-timeout=${builtins.toString v.keyFileTimeout}s"
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++ optional (v.tryEmptyPassphrase) "try-empty-password=true"
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;
|
|
in "${n} ${v.device} ${if v.keyFile == null then "-" else v.keyFile} ${lib.concatStringsSep "," opts}") luks.devices));
|
|
|
|
in
|
|
{
|
|
imports = [
|
|
(mkRemovedOptionModule [ "boot" "initrd" "luks" "enable" ] "")
|
|
];
|
|
|
|
options = {
|
|
|
|
boot.initrd.luks.mitigateDMAAttacks = mkOption {
|
|
type = types.bool;
|
|
default = true;
|
|
description = lib.mdDoc ''
|
|
Unless enabled, encryption keys can be easily recovered by an attacker with physical
|
|
access to any machine with PCMCIA, ExpressCard, ThunderBolt or FireWire port.
|
|
More information is available at <http://en.wikipedia.org/wiki/DMA_attack>.
|
|
|
|
This option blacklists FireWire drivers, but doesn't remove them. You can manually
|
|
load the drivers if you need to use a FireWire device, but don't forget to unload them!
|
|
'';
|
|
};
|
|
|
|
boot.initrd.luks.cryptoModules = mkOption {
|
|
type = types.listOf types.str;
|
|
default =
|
|
[ "aes" "aes_generic" "blowfish" "twofish"
|
|
"serpent" "cbc" "xts" "lrw" "sha1" "sha256" "sha512"
|
|
"af_alg" "algif_skcipher"
|
|
];
|
|
description = lib.mdDoc ''
|
|
A list of cryptographic kernel modules needed to decrypt the root device(s).
|
|
The default includes all common modules.
|
|
'';
|
|
};
|
|
|
|
boot.initrd.luks.forceLuksSupportInInitrd = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
internal = true;
|
|
description = lib.mdDoc ''
|
|
Whether to configure luks support in the initrd, when no luks
|
|
devices are configured.
|
|
'';
|
|
};
|
|
|
|
boot.initrd.luks.reusePassphrases = mkOption {
|
|
type = types.bool;
|
|
default = true;
|
|
description = lib.mdDoc ''
|
|
When opening a new LUKS device try reusing last successful
|
|
passphrase.
|
|
|
|
Useful for mounting a number of devices that use the same
|
|
passphrase without retyping it several times.
|
|
|
|
Such setup can be useful if you use {command}`cryptsetup luksSuspend`.
|
|
Different LUKS devices will still have
|
|
different master keys even when using the same passphrase.
|
|
'';
|
|
};
|
|
|
|
boot.initrd.luks.devices = mkOption {
|
|
default = { };
|
|
example = { luksroot.device = "/dev/disk/by-uuid/430e9eff-d852-4f68-aa3b-2fa3599ebe08"; };
|
|
description = lib.mdDoc ''
|
|
The encrypted disk that should be opened before the root
|
|
filesystem is mounted. Both LVM-over-LUKS and LUKS-over-LVM
|
|
setups are supported. The unencrypted devices can be accessed as
|
|
{file}`/dev/mapper/«name»`.
|
|
'';
|
|
|
|
type = with types; attrsOf (submodule (
|
|
{ name, ... }: { options = {
|
|
|
|
name = mkOption {
|
|
visible = false;
|
|
default = name;
|
|
example = "luksroot";
|
|
type = types.str;
|
|
description = lib.mdDoc "Name of the unencrypted device in {file}`/dev/mapper`.";
|
|
};
|
|
|
|
device = mkOption {
|
|
example = "/dev/disk/by-uuid/430e9eff-d852-4f68-aa3b-2fa3599ebe08";
|
|
type = types.str;
|
|
description = lib.mdDoc "Path of the underlying encrypted block device.";
|
|
};
|
|
|
|
header = mkOption {
|
|
default = null;
|
|
example = "/root/header.img";
|
|
type = types.nullOr types.str;
|
|
description = lib.mdDoc ''
|
|
The name of the file or block device that
|
|
should be used as header for the encrypted device.
|
|
'';
|
|
};
|
|
|
|
keyFile = mkOption {
|
|
default = null;
|
|
example = "/dev/sdb1";
|
|
type = types.nullOr types.str;
|
|
description = lib.mdDoc ''
|
|
The name of the file (can be a raw device or a partition) that
|
|
should be used as the decryption key for the encrypted device. If
|
|
not specified, you will be prompted for a passphrase instead.
|
|
'';
|
|
};
|
|
|
|
tryEmptyPassphrase = mkOption {
|
|
default = false;
|
|
type = types.bool;
|
|
description = lib.mdDoc ''
|
|
If keyFile fails then try an empty passphrase first before
|
|
prompting for password.
|
|
'';
|
|
};
|
|
|
|
keyFileTimeout = mkOption {
|
|
default = null;
|
|
example = 5;
|
|
type = types.nullOr types.int;
|
|
description = lib.mdDoc ''
|
|
The amount of time in seconds for a keyFile to appear before
|
|
timing out and trying passwords.
|
|
'';
|
|
};
|
|
|
|
keyFileSize = mkOption {
|
|
default = null;
|
|
example = 4096;
|
|
type = types.nullOr types.int;
|
|
description = lib.mdDoc ''
|
|
The size of the key file. Use this if only the beginning of the
|
|
key file should be used as a key (often the case if a raw device
|
|
or partition is used as key file). If not specified, the whole
|
|
`keyFile` will be used decryption, instead of just
|
|
the first `keyFileSize` bytes.
|
|
'';
|
|
};
|
|
|
|
keyFileOffset = mkOption {
|
|
default = null;
|
|
example = 4096;
|
|
type = types.nullOr types.int;
|
|
description = lib.mdDoc ''
|
|
The offset of the key file. Use this in combination with
|
|
`keyFileSize` to use part of a file as key file
|
|
(often the case if a raw device or partition is used as a key file).
|
|
If not specified, the key begins at the first byte of
|
|
`keyFile`.
|
|
'';
|
|
};
|
|
|
|
# FIXME: get rid of this option.
|
|
preLVM = mkOption {
|
|
default = true;
|
|
type = types.bool;
|
|
description = lib.mdDoc "Whether the luksOpen will be attempted before LVM scan or after it.";
|
|
};
|
|
|
|
allowDiscards = mkOption {
|
|
default = false;
|
|
type = types.bool;
|
|
description = lib.mdDoc ''
|
|
Whether to allow TRIM requests to the underlying device. This option
|
|
has security implications; please read the LUKS documentation before
|
|
activating it.
|
|
This option is incompatible with authenticated encryption (dm-crypt
|
|
stacked over dm-integrity).
|
|
'';
|
|
};
|
|
|
|
bypassWorkqueues = mkOption {
|
|
default = false;
|
|
type = types.bool;
|
|
description = lib.mdDoc ''
|
|
Whether to bypass dm-crypt's internal read and write workqueues.
|
|
Enabling this should improve performance on SSDs; see
|
|
[here](https://wiki.archlinux.org/index.php/Dm-crypt/Specialties#Disable_workqueue_for_increased_solid_state_drive_(SSD)_performance)
|
|
for more information. Needs Linux 5.9 or later.
|
|
'';
|
|
};
|
|
|
|
fallbackToPassword = mkOption {
|
|
default = false;
|
|
type = types.bool;
|
|
description = lib.mdDoc ''
|
|
Whether to fallback to interactive passphrase prompt if the keyfile
|
|
cannot be found. This will prevent unattended boot should the keyfile
|
|
go missing.
|
|
'';
|
|
};
|
|
|
|
gpgCard = mkOption {
|
|
default = null;
|
|
description = lib.mdDoc ''
|
|
The option to use this LUKS device with a GPG encrypted luks password by the GPG Smartcard.
|
|
If null (the default), GPG-Smartcard will be disabled for this device.
|
|
'';
|
|
|
|
type = with types; nullOr (submodule {
|
|
options = {
|
|
gracePeriod = mkOption {
|
|
default = 10;
|
|
type = types.int;
|
|
description = lib.mdDoc "Time in seconds to wait for the GPG Smartcard.";
|
|
};
|
|
|
|
encryptedPass = mkOption {
|
|
type = types.path;
|
|
description = lib.mdDoc "Path to the GPG encrypted passphrase.";
|
|
};
|
|
|
|
publicKey = mkOption {
|
|
type = types.path;
|
|
description = lib.mdDoc "Path to the Public Key.";
|
|
};
|
|
};
|
|
});
|
|
};
|
|
|
|
fido2 = {
|
|
credential = mkOption {
|
|
default = null;
|
|
example = "f1d00200d8dc783f7fb1e10ace8da27f8312d72692abfca2f7e4960a73f48e82e1f7571f6ebfcee9fb434f9886ccc8fcc52a6614d8d2";
|
|
type = types.nullOr types.str;
|
|
description = lib.mdDoc "The FIDO2 credential ID.";
|
|
};
|
|
|
|
credentials = mkOption {
|
|
default = [];
|
|
example = [ "f1d00200d8dc783f7fb1e10ace8da27f8312d72692abfca2f7e4960a73f48e82e1f7571f6ebfcee9fb434f9886ccc8fcc52a6614d8d2" ];
|
|
type = types.listOf types.str;
|
|
description = lib.mdDoc ''
|
|
List of FIDO2 credential IDs.
|
|
|
|
Use this if you have multiple FIDO2 keys you want to use for the same luks device.
|
|
'';
|
|
};
|
|
|
|
gracePeriod = mkOption {
|
|
default = 10;
|
|
type = types.int;
|
|
description = lib.mdDoc "Time in seconds to wait for the FIDO2 key.";
|
|
};
|
|
|
|
passwordLess = mkOption {
|
|
default = false;
|
|
type = types.bool;
|
|
description = lib.mdDoc ''
|
|
Defines whatever to use an empty string as a default salt.
|
|
|
|
Enable only when your device is PIN protected, such as [Trezor](https://trezor.io/).
|
|
'';
|
|
};
|
|
};
|
|
|
|
yubikey = mkOption {
|
|
default = null;
|
|
description = lib.mdDoc ''
|
|
The options to use for this LUKS device in YubiKey-PBA.
|
|
If null (the default), YubiKey-PBA will be disabled for this device.
|
|
'';
|
|
|
|
type = with types; nullOr (submodule {
|
|
options = {
|
|
twoFactor = mkOption {
|
|
default = true;
|
|
type = types.bool;
|
|
description = lib.mdDoc "Whether to use a passphrase and a YubiKey (true), or only a YubiKey (false).";
|
|
};
|
|
|
|
slot = mkOption {
|
|
default = 2;
|
|
type = types.int;
|
|
description = lib.mdDoc "Which slot on the YubiKey to challenge.";
|
|
};
|
|
|
|
saltLength = mkOption {
|
|
default = 16;
|
|
type = types.int;
|
|
description = lib.mdDoc "Length of the new salt in byte (64 is the effective maximum).";
|
|
};
|
|
|
|
keyLength = mkOption {
|
|
default = 64;
|
|
type = types.int;
|
|
description = lib.mdDoc "Length of the LUKS slot key derived with PBKDF2 in byte.";
|
|
};
|
|
|
|
iterationStep = mkOption {
|
|
default = 0;
|
|
type = types.int;
|
|
description = lib.mdDoc "How much the iteration count for PBKDF2 is increased at each successful authentication.";
|
|
};
|
|
|
|
gracePeriod = mkOption {
|
|
default = 10;
|
|
type = types.int;
|
|
description = lib.mdDoc "Time in seconds to wait for the YubiKey.";
|
|
};
|
|
|
|
/* TODO: Add to the documentation of the current module:
|
|
|
|
Options related to the storing the salt.
|
|
*/
|
|
storage = {
|
|
device = mkOption {
|
|
default = "/dev/sda1";
|
|
type = types.path;
|
|
description = lib.mdDoc ''
|
|
An unencrypted device that will temporarily be mounted in stage-1.
|
|
Must contain the current salt to create the challenge for this LUKS device.
|
|
'';
|
|
};
|
|
|
|
fsType = mkOption {
|
|
default = "vfat";
|
|
type = types.str;
|
|
description = lib.mdDoc "The filesystem of the unencrypted device.";
|
|
};
|
|
|
|
path = mkOption {
|
|
default = "/crypt-storage/default";
|
|
type = types.str;
|
|
description = lib.mdDoc ''
|
|
Absolute path of the salt on the unencrypted device with
|
|
that device's root directory as "/".
|
|
'';
|
|
};
|
|
};
|
|
};
|
|
});
|
|
};
|
|
|
|
preOpenCommands = mkOption {
|
|
type = types.lines;
|
|
default = "";
|
|
example = ''
|
|
mkdir -p /tmp/persistent
|
|
mount -t zfs rpool/safe/persistent /tmp/persistent
|
|
'';
|
|
description = lib.mdDoc ''
|
|
Commands that should be run right before we try to mount our LUKS device.
|
|
This can be useful, if the keys needed to open the drive is on another partition.
|
|
'';
|
|
};
|
|
|
|
postOpenCommands = mkOption {
|
|
type = types.lines;
|
|
default = "";
|
|
example = ''
|
|
umount /tmp/persistent
|
|
'';
|
|
description = lib.mdDoc ''
|
|
Commands that should be run right after we have mounted our LUKS device.
|
|
'';
|
|
};
|
|
|
|
crypttabExtraOpts = mkOption {
|
|
type = with types; listOf singleLineStr;
|
|
default = [];
|
|
example = [ "_netdev" ];
|
|
visible = false;
|
|
description = lib.mdDoc ''
|
|
Only used with systemd stage 1.
|
|
|
|
Extra options to append to the last column of the generated crypttab file.
|
|
'';
|
|
};
|
|
};
|
|
}));
|
|
};
|
|
|
|
boot.initrd.luks.gpgSupport = mkOption {
|
|
default = false;
|
|
type = types.bool;
|
|
description = lib.mdDoc ''
|
|
Enables support for authenticating with a GPG encrypted password.
|
|
'';
|
|
};
|
|
|
|
boot.initrd.luks.yubikeySupport = mkOption {
|
|
default = false;
|
|
type = types.bool;
|
|
description = lib.mdDoc ''
|
|
Enables support for authenticating with a YubiKey on LUKS devices.
|
|
See the NixOS wiki for information on how to properly setup a LUKS device
|
|
and a YubiKey to work with this feature.
|
|
'';
|
|
};
|
|
|
|
boot.initrd.luks.fido2Support = mkOption {
|
|
default = false;
|
|
type = types.bool;
|
|
description = lib.mdDoc ''
|
|
Enables support for authenticating with FIDO2 devices.
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
config = mkIf (luks.devices != {} || luks.forceLuksSupportInInitrd) {
|
|
|
|
assertions =
|
|
[ { assertion = !(luks.gpgSupport && luks.yubikeySupport);
|
|
message = "YubiKey and GPG Card may not be used at the same time.";
|
|
}
|
|
|
|
{ assertion = !(luks.gpgSupport && luks.fido2Support);
|
|
message = "FIDO2 and GPG Card may not be used at the same time.";
|
|
}
|
|
|
|
{ assertion = !(luks.fido2Support && luks.yubikeySupport);
|
|
message = "FIDO2 and YubiKey may not be used at the same time.";
|
|
}
|
|
|
|
{ assertion = any (dev: dev.bypassWorkqueues) (attrValues luks.devices)
|
|
-> versionAtLeast kernelPackages.kernel.version "5.9";
|
|
message = "boot.initrd.luks.devices.<name>.bypassWorkqueues is not supported for kernels older than 5.9";
|
|
}
|
|
|
|
{ assertion = !config.boot.initrd.systemd.enable -> all (x: x.keyFileTimeout == null) (attrValues luks.devices);
|
|
message = "boot.initrd.luks.devices.<name>.keyFileTimeout is only supported for systemd initrd";
|
|
}
|
|
|
|
{ assertion = config.boot.initrd.systemd.enable -> all (dev: !dev.fallbackToPassword) (attrValues luks.devices);
|
|
message = "boot.initrd.luks.devices.<name>.fallbackToPassword is implied by systemd stage 1.";
|
|
}
|
|
{ assertion = config.boot.initrd.systemd.enable -> all (dev: dev.preLVM) (attrValues luks.devices);
|
|
message = "boot.initrd.luks.devices.<name>.preLVM is not used by systemd stage 1.";
|
|
}
|
|
{ assertion = config.boot.initrd.systemd.enable -> options.boot.initrd.luks.reusePassphrases.highestPrio == defaultPrio;
|
|
message = "boot.initrd.luks.reusePassphrases has no effect with systemd stage 1.";
|
|
}
|
|
{ assertion = config.boot.initrd.systemd.enable -> all (dev: dev.preOpenCommands == "" && dev.postOpenCommands == "") (attrValues luks.devices);
|
|
message = "boot.initrd.luks.devices.<name>.preOpenCommands and postOpenCommands is not supported by systemd stage 1. Please bind a service to cryptsetup.target or cryptsetup-pre.target instead.";
|
|
}
|
|
# TODO
|
|
{ assertion = config.boot.initrd.systemd.enable -> !luks.gpgSupport;
|
|
message = "systemd stage 1 does not support GPG smartcards yet.";
|
|
}
|
|
{ assertion = config.boot.initrd.systemd.enable -> !luks.fido2Support;
|
|
message = ''
|
|
systemd stage 1 does not support configuring FIDO2 unlocking through `boot.initrd.luks.devices.<name>.fido2`.
|
|
Use systemd-cryptenroll(1) to configure FIDO2 support.
|
|
'';
|
|
}
|
|
# TODO
|
|
{ assertion = config.boot.initrd.systemd.enable -> !luks.yubikeySupport;
|
|
message = "systemd stage 1 does not support Yubikeys yet.";
|
|
}
|
|
];
|
|
|
|
# actually, sbp2 driver is the one enabling the DMA attack, but this needs to be tested
|
|
boot.blacklistedKernelModules = optionals luks.mitigateDMAAttacks
|
|
["firewire_ohci" "firewire_core" "firewire_sbp2"];
|
|
|
|
# Some modules that may be needed for mounting anything ciphered
|
|
boot.initrd.availableKernelModules = [ "dm_mod" "dm_crypt" "cryptd" "input_leds" ]
|
|
++ luks.cryptoModules
|
|
# workaround until https://marc.info/?l=linux-crypto-vger&m=148783562211457&w=4 is merged
|
|
# remove once 'modprobe --show-depends xts' shows ecb as a dependency
|
|
++ (optional (builtins.elem "xts" luks.cryptoModules) "ecb");
|
|
|
|
# copy the cryptsetup binary and it's dependencies
|
|
boot.initrd.extraUtilsCommands = let
|
|
pbkdf2-sha512 = pkgs.runCommandCC "pbkdf2-sha512" { buildInputs = [ pkgs.openssl ]; } ''
|
|
mkdir -p "$out/bin"
|
|
cc -O3 -lcrypto ${./pbkdf2-sha512.c} -o "$out/bin/pbkdf2-sha512"
|
|
strip -s "$out/bin/pbkdf2-sha512"
|
|
'';
|
|
in
|
|
mkIf (!config.boot.initrd.systemd.enable) ''
|
|
copy_bin_and_libs ${pkgs.cryptsetup}/bin/cryptsetup
|
|
copy_bin_and_libs ${askPass}/bin/cryptsetup-askpass
|
|
sed -i s,/bin/sh,$out/bin/sh, $out/bin/cryptsetup-askpass
|
|
|
|
${optionalString luks.yubikeySupport ''
|
|
copy_bin_and_libs ${pkgs.yubikey-personalization}/bin/ykchalresp
|
|
copy_bin_and_libs ${pkgs.yubikey-personalization}/bin/ykinfo
|
|
copy_bin_and_libs ${pkgs.openssl.bin}/bin/openssl
|
|
|
|
copy_bin_and_libs ${pbkdf2-sha512}/bin/pbkdf2-sha512
|
|
|
|
mkdir -p $out/etc/ssl
|
|
cp -pdv ${pkgs.openssl.out}/etc/ssl/openssl.cnf $out/etc/ssl
|
|
|
|
cat > $out/bin/openssl-wrap <<EOF
|
|
#!$out/bin/sh
|
|
export OPENSSL_CONF=$out/etc/ssl/openssl.cnf
|
|
$out/bin/openssl "\$@"
|
|
EOF
|
|
chmod +x $out/bin/openssl-wrap
|
|
''}
|
|
|
|
${optionalString luks.fido2Support ''
|
|
copy_bin_and_libs ${pkgs.fido2luks}/bin/fido2luks
|
|
''}
|
|
|
|
|
|
${optionalString luks.gpgSupport ''
|
|
copy_bin_and_libs ${pkgs.gnupg}/bin/gpg
|
|
copy_bin_and_libs ${pkgs.gnupg}/bin/gpg-agent
|
|
copy_bin_and_libs ${pkgs.gnupg}/libexec/scdaemon
|
|
|
|
${concatMapStringsSep "\n" (x:
|
|
optionalString (x.gpgCard != null)
|
|
''
|
|
mkdir -p $out/secrets/gpg-keys/${x.device}
|
|
cp -a ${x.gpgCard.encryptedPass} $out/secrets/gpg-keys/${x.device}/cryptkey.gpg
|
|
cp -a ${x.gpgCard.publicKey} $out/secrets/gpg-keys/${x.device}/pubkey.asc
|
|
''
|
|
) (attrValues luks.devices)
|
|
}
|
|
''}
|
|
'';
|
|
|
|
boot.initrd.extraUtilsCommandsTest = mkIf (!config.boot.initrd.systemd.enable) ''
|
|
$out/bin/cryptsetup --version
|
|
${optionalString luks.yubikeySupport ''
|
|
$out/bin/ykchalresp -V
|
|
$out/bin/ykinfo -V
|
|
$out/bin/openssl-wrap version
|
|
''}
|
|
${optionalString luks.gpgSupport ''
|
|
$out/bin/gpg --version
|
|
$out/bin/gpg-agent --version
|
|
$out/bin/scdaemon --version
|
|
''}
|
|
${optionalString luks.fido2Support ''
|
|
$out/bin/fido2luks --version
|
|
''}
|
|
'';
|
|
|
|
boot.initrd.systemd = {
|
|
contents."/etc/crypttab".source = stage1Crypttab;
|
|
|
|
extraBin.systemd-cryptsetup = "${config.boot.initrd.systemd.package}/lib/systemd/systemd-cryptsetup";
|
|
|
|
additionalUpstreamUnits = [
|
|
"cryptsetup-pre.target"
|
|
"cryptsetup.target"
|
|
"remote-cryptsetup.target"
|
|
];
|
|
storePaths = [
|
|
"${config.boot.initrd.systemd.package}/lib/systemd/systemd-cryptsetup"
|
|
"${config.boot.initrd.systemd.package}/lib/systemd/system-generators/systemd-cryptsetup-generator"
|
|
];
|
|
|
|
};
|
|
# We do this because we need the udev rules from the package
|
|
boot.initrd.services.lvm.enable = true;
|
|
|
|
boot.initrd.preFailCommands = mkIf (!config.boot.initrd.systemd.enable) postCommands;
|
|
boot.initrd.preLVMCommands = mkIf (!config.boot.initrd.systemd.enable) (commonFunctions + preCommands + concatStrings (mapAttrsToList openCommand preLVM) + postCommands);
|
|
boot.initrd.postDeviceCommands = mkIf (!config.boot.initrd.systemd.enable) (commonFunctions + preCommands + concatStrings (mapAttrsToList openCommand postLVM) + postCommands);
|
|
|
|
environment.systemPackages = [ pkgs.cryptsetup ];
|
|
};
|
|
}
|