[dm-crypt] problems mounting encrypted drive on reboot

Jerry Lowry jlowry at edt.com
Thu Sep 21 00:38:20 CEST 2017


Hi,

I have created an encrypted drive using the following commands:

#>cryptsetup --verify=passphrase -- hash=sha256 --keyfile=/dir/file 
create /dev/mapper/testcui /dev/sdb

#>mkfs.ext4 /dev/mapper/testcui

I did this all at single user level.  running centos 7 on a VM.

this all work well until I reboot the system and then it fails to mount 
the device and drops down it to emergency mode.  This is the journalctl 
output I get. ( yeah I know about the acls on the key file )  device 
name  "testcui"

Sep 20 14:19:53 jubilee systemd[1]: Starting Cryptography Setup for 
/dev/mapper/testcui...
-- Subject: Unit systemd-cryptsetup at -dev-mapper-testcui.service has 
begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit systemd-cryptsetup at -dev-mapper-testcui.service has begun 
starting up.
Sep 20 14:19:53 jubilee systemd-cryptsetup[501]: Key file /etc/keys is 
world-readable. This is not a good idea!
Sep 20 14:19:53 jubilee systemd-cryptsetup[501]: Set cipher aes, mode 
cbc-essiv:sha256, key size 256 bits for device /dev/sdb.
Sep 20 14:19:53 jubilee systemd-cryptsetup[501]: *Failed to activate 
with key file '/etc/keys': Invalid argument*
Sep 20 14:19:53 jubilee systemd[1]: Started Forward Password Requests to 
Plymouth.

What is the invalid argument that it is complaining about?

Once in emergency mode I can :

#>cryptsetup create testcui /dev/sdb

( passcode)

And it continues just fine.

-- crypttab --

# test disk
#
/dev/mapper/testcui  /dev/sdb /etc/keys plain

--fstab--

#
# /etc/fstab
# Created by anaconda on Tue Dec 15 12:05:51 2015
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=c4cc85f2-9dbb-4bf8-8b3e-edaa5af3dae9 / xfs     defaults        1 1
UUID=2f178edb-b16e-4ea1-85c3-d8243b07a75b /boot xfs     defaults        1 2
UUID=a34fac21-a385-494a-a6cc-cae22b87c8c9 swap swap    defaults        0 0
/dev/mapper/testcui    /cui        ext4    defaults    1 2

jerry

-- 

---------------------------------------------------------------------------
Jerold Lowry
Principal Network/Systems Engineer
Engineering Design Team (EDT), Inc. a HEICO company
3423 NW John Olsen Pl
Hillsboro, Oregon 97124 (U.S.A.)
Phone: 503-690-1234 / 800-435-4320
Fax: 503-690-1243
Web: _www.edt.com <http://www.edt.com/>_


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