无法将LUKS密钥添加到加密交换中

Question

出于某种原因，我无法在加密的交换中添加密钥。

我的/etc/crypttab：

swap_crypt /dev/disk/by-partuuid/c4f049d5-ae21-44d6-b753-6e72b7e21770 none luks,swap,discard,keyscript=decrypt_keyctl
root_crypt UUID=26f3c181-e041-47f2-929b-de631a2f1d3f none luks,discard,keyscript=decrypt_keyctl

因此，要识别这些磁盘：

# ls -l /dev/disk/by-partuuid/c4f049d5-ae21-44d6-b753-6e72b7e21770
lrwxrwxrwx 1 root root 15 Mar  5 22:34 /dev/disk/by-partuuid/c4f049d5-ae21-44d6-b753-6e72b7e21770 -> ../../nvme0n1p7

# blkid |grep 26f3c181-e041-47f2-929b-de631a2f1d3f
/dev/nvme0n1p8: UUID="26f3c181-e041-47f2-929b-de631a2f1d3f" TYPE="crypto_LUKS" PARTUUID="b178ae44-cf49-4dce-b7b5-293c9c0bb9c7"

所以我知道我的交换是在/dev/nvme0n1p7上的，我的根是/dev/nvme0n1p8。

现在，当我尝试为root添加键时：

# cryptsetup luksAddKey /dev/nvme0n1p8
Enter any existing passphrase:

但是，对于交换，一切都很好：

# cryptsetup luksAddKey /dev/nvme0n1p7

它就这样离开了。更多一些信息：

# cryptsetup luksAddKey -v --debug /dev/nvme0n1p7
# cryptsetup 2.0.2 processing "cryptsetup luksAddKey -v --debug /dev/nvme0n1p7"
# Running command luksAddKey.
# Locking memory.
# Installing SIGINT/SIGTERM handler.
# Unblocking interruption on signal.
# Allocating context for crypt device /dev/nvme0n1p7.
# Trying to open and read device /dev/nvme0n1p7 with direct-io.
# Initialising device-mapper backend library.
# Trying to load any crypt type from device /dev/nvme0n1p7.
# Crypto backend (gcrypt 1.8.1) initialized in cryptsetup library version 2.0.2.
# Detected kernel Linux 5.0.0-050000-generic x86_64.
# Loading LUKS2 header.
# Opening lock resource file /run/cryptsetup/L_259:7
# Acquiring read lock for device /dev/nvme0n1p7.
# Verifying read lock handle for device /dev/nvme0n1p7.
# Device /dev/nvme0n1p7 READ lock taken.
# Trying to read primary LUKS2 header at offset 0.
# Opening locked device /dev/nvme0n1p7
# Veryfing locked device handle (bdev)
# Trying to read secondary LUKS2 header at offset 8192.
# Opening locked device /dev/nvme0n1p7
# Veryfing locked device handle (bdev)
# Trying to read secondary LUKS2 header at offset 16384.
# Opening locked device /dev/nvme0n1p7
# Veryfing locked device handle (bdev)
# Trying to read secondary LUKS2 header at offset 32768.
# Opening locked device /dev/nvme0n1p7
# Veryfing locked device handle (bdev)
# Trying to read secondary LUKS2 header at offset 65536.
# Opening locked device /dev/nvme0n1p7
# Veryfing locked device handle (bdev)
# Trying to read secondary LUKS2 header at offset 131072.
# Opening locked device /dev/nvme0n1p7
# Veryfing locked device handle (bdev)
# Trying to read secondary LUKS2 header at offset 262144.
# Opening locked device /dev/nvme0n1p7
# Veryfing locked device handle (bdev)
# Trying to read secondary LUKS2 header at offset 524288.
# Opening locked device /dev/nvme0n1p7
# Veryfing locked device handle (bdev)
# Trying to read secondary LUKS2 header at offset 1048576.
# Opening locked device /dev/nvme0n1p7
# Veryfing locked device handle (bdev)
# Trying to read secondary LUKS2 header at offset 2097152.
# Opening locked device /dev/nvme0n1p7
# Veryfing locked device handle (bdev)
# Trying to read secondary LUKS2 header at offset 4194304.
# Opening locked device /dev/nvme0n1p7
# Veryfing locked device handle (bdev)
# LUKS2 header read failed (-22).
# Device /dev/nvme0n1p7 READ lock released.
# Releasing crypt device /dev/nvme0n1p7 context.
# Releasing device-mapper backend.
# Unlocking memory.
Command failed with code -1 (wrong or missing parameters).

知道问题出在哪里吗？

Answer 1

所以我终于自己解决了这个问题。对于任何遇到这种情况的人，请确保在运行cryptsetup status /dev/mapper/<device>时，类型是LUKS1而不是PLAIN。看起来Ubuntu安装程序是不正确的，因此标准的LUKS命令无法在设备上工作。由于它是交换，我能够重新正确地加密，现在一切顺利。