[SOLVED] Chicken and Egg: Mounting an encrypted FS from a full-disk Image

yooden · 03-03-2014, 05:41 AM

I created a full-disk HD image with dd:

Code:

dd if=/dev/sda of=/path/file.img

Now I want to mount the filesystems out of this image. I used parted to get the offset and run mount:

Code:

mount -o loop,ro,offset=12345 file.img /mnt/note/root

That works fine. However, one of the FS is encrypted, and I don't see a way to mount that. Mount says:

Code:

mount: unknown filesystem type 'crypto_LUKS'

It seems that mount needs some crypto, but cryptsetup only works on devices, which I don't have yet. So where do I have to look to get this running?

Thanks!

syg00 · 03-03-2014, 06:23 AM

Loop mount the filesystem as well, then issue the luksOpen, then the mount.
Have a look at partx.

yooden · 03-03-2014, 06:25 AM

Quote:

Originally Posted by syg00

Loop mount the filesystem as well, then issue the luksOpen, then the mount.
Have a look at partx.

I cannot loop mount it, mount gives me back the error I quoted above:

Code:

# mount -o loop,ro,offset=12345 file.img /mnt/note/home
mount: unknown filesystem type 'crypto_LUKS'

Edit: I think I don't understand you. What do you mean with "the filesystem"?

Edit: This works:

Code:

# losetup /dev/loop3 file.img -o 12345
# cryptsetup luksOpen /dev/loop3 notehome
# mount /dev/mapper/notehome /mnt/note/home

I had a look at losetup before, but I missed the offset.

Thanks for the pointer!