knoppix 5.1-- how to mount an encrypted partition?

**bezdomny** · 07-12-2008

Trying to mount an encrypted partition in Knoppix 5.1 so I can rescue my data as my GUI (X server?) no longer works and dpkg-reconfigure xserver-xorg doesn't seem to help:

# mount -t ext3 /dev/hdb5 /media/hdb5=

Code:

mount: wrong fs type, bad option, bad superblock on /dev/hdb5,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

# dmesg | tail=

Code:

VFS: Can't find ext3 filesystem on dev hdb5

I know this partition is ext3 file system. Is there an extra step or different procedure for mounting an encrypted partition in Knoppix?

Thank you! and best regards from (smoky) Northern California USA

bezdomny

**kakariko81280** · 07-12-2008

It may be possible, but we will need to know how the partition was encrypted before we can give you specific instructions.

The mount command will fail because it will not automatically detect encrypted partitions and you aren't giving it any options that tell it to expect one. All it can see is the encrypted data dumped on a partition that makes no sense.

Let us know how you get on,

Chris...

**bezdomny** · 07-12-2008

Thanks, Chris. It's been awhile since I setup this installation. I only know that during installation I chose one of the encryption options and when I logon, I'm prompted for the "LUKS passphrase". Does that help? Thanks again!

**kakariko81280** · 07-12-2008

That should be enough for us to try and fix this.

Code:

cryptsetup luksOpen /dev/hdb5 enc
<Should ask for passphrase here>
mount /dev/mapper/enc /media/hdb5

If that doesn't work then post the output of the commands here. It would also help if you could tell us what you were installing when it asked you, then we can look up default settings for it's encrypted partitions.

Let us know how you get on,

Chris...

**bezdomny** · 07-12-2008

Thanks, Chris! I think we're almost there.

cryptsetup luksOpen /dev/hdb5 enc=

Code:

Enter LUKS passphrase: [note-- passphrase entered-- bezdomny]
key slot 0 unlocked.
Command successful.

mount /dev/mapper/enc /media/hdb5=

Code:

mount: you must specify the filesystem type

Chris, I could swear this was ext3 but maybe I'm wrong. At any rate, I should be able to boot into the command line after the LUKS passphrase and run a command to identify the filesystem type, correct?

Looking forward to hearing from you!

best regards from (smoky) Northern California,

bezdomny

**kakariko81280** · 07-12-2008

That should have done it. Try this then.

Code:

mount -t ext3 /dev/mapper/enc /media/hdb5

If that doesn't work then this should tell you what the filesystem is.

Code:

file -s /dev/mapper/enc

Then use whatever it tells you as the filesystem type for the mount command.

Let us know how you get on,

Chris...

**bezdomny** · 07-12-2008

Thanks again, Chris.

# mount -t ext3 /dev/mapper/enc /media/hdb5=

Code:

mount: wrong fs type, bad option, bad superblock on /dev/mapper/enc,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

#dmesg | tail=

Code:

Mobile IPv6
eth0: no IPv6 routers present
device-mapper: ioctl: 4.10.0-ioctl (2006-09-14) initialised: dm-devel@redhat.com
kjournald starting.  Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
e100: eth0: e100_watchdog: link up, 100Mbps, full-duplex
eth0: no IPv6 routers present
EFS: 1.0a - http://aeschi.ch.eu.org/efs/
VFS: Can't find ext3 filesystem on dev dm-0.
VFS: Can't find ext3 filesystem on dev dm-0.

So I'm going to log off of knoppix, log into the hdd, enter the passphrase and then run

Code:

file -s /dev/mapper/enc

at the command line.

I'll let you know how it goes.

best regards as always from (smoky) northern California USA,

bezdomny

**bezdomny** · 07-13-2008

Code:

file -s /dev/mapper/enc

erred out complaining of no such file or directory. So I ran the command on the directories that are present at /dev/mapper:

Code:

file -s /dev/mapper/bezdomny-root

=

Code:

Linux rev1.0 ext3 filesystem (needs journal recovery) (large files)

Code:

file -s /dev/mapper/hdb5_crypt

=

Code:

LVM2 (Linux Logical Volume manager) UUID kPFhUCUJ4riuB0s2caSXwl00SLgYi6RS

Hope this helps!

best regards from (smoky) Northern California USA,

bezdomny

**kakariko81280** · 07-13-2008

That does help, kind of. The stack goes:

Code:

ext3
lvm
cryptsetup
disk

I wasn't expecting the lvm bit of that which is why the mount -t ext3 isn't working. Unfortunately my knowledge of lvm is almost non existent. I'm reading the LVM Howto to try and find out what you need to do to mount the volume, but it will take a little time to figure out. Perhaps someone with more experience than I can help us both out.

In the meantime, if you can boot your system can you not do a backup from the command line?

Let us know how you get on,

Chris...

**bezdomny** · 07-13-2008

Chris, thanks. Did I tell you I got my Xserver back? However, I'm still interested in solving this for future reference-- I'm sure it will come up again, if not with me, with someone I'm assisting.

At any rate, I don't know what you mean by backup from the command line. Backup what? Could you please indulge my poor understanding of Linux and be more specific?

Thanks!

best regards,

bezdomny

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