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Encrypting Data Partitions

Novell Cool Solutions: Feature
By Kirk Coombs

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Posted: 24 Aug 2005

Applies To:

  • SUSE Linux Enterprise Server
  • SUSE Linux Professional
  • Novell Linux Desktop
  • Open Enterprise Server
Note: If the password for an encrypted partition is forgotten, all data will be unrecoverable!

YaST includes the option to encrypt partitions. It is a good idea to encrypt any partitions that contain sensitive data.

  1. In the YaST Partitioner create a new partition as normal:
    1. Select 'Create.'
    2. Select the disk to create the partition on.
    3. Select whether a primary or extended partition should be created (if prompted).
  2. In the create partition dialog, select a filesystem (other than swap or FAT) and a mount point. Note that you CANNOT encrypt /, /usr, /boot, or swap.
  3. Select a size for the partition.
  4. Check "Encrypt File System" and select 'OK'.
  5. Enter a password and select 'OK'.

The encrypted filesystem is created and its entry is added /etc/cryptotab. For example:

# cat /etc/cryptotab
/dev/loop0 /dev/sdb1 /encrypted_mount_point reiserfs \ twofish256,acl,user_xattr

When the system boots, a password is required before the filesystem is mounted:

Activating crypto devices using /etc/cryptotab ...
Please enter passphrase for /dev/sdb1:

It can be mounted and unmounted with the /etc/init.t/boot.crypto script. For example:

To mount:

/etc/init.d/boot.crypto start

To unmount:

/etc/init.d/boot.crypto stop

Alternatively, the mount commands can be used directly.

To mount an encrypted partition, a loopback device must first be established:

# losetup -e twofish256 /dev/loop0 /dev/sdb1

Then, the loopback device can be mounted:

# mount /dev/loop0 /encrypted_mount_point

To unmount, simply use the umount command then delete the loopback device:

# umount /encrypted_mount_point
# losetup -d /dev/loop0

Note that if you get an error like "mount: you must specify the filesystem type" when mounting, you may have entered the wrong password. Delete the loopback device and try again.

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