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9
votes
2answers
6k views

How to mount a cryptsetup container just with `mount`?

I created an encrypted container via #!/bin/bash dd if=/dev/zero of=$1 bs=1 count=0 seek=$2 MAPPER=$(mktemp -up /dev/mapper) LOOPDEV=$(losetup --find --show $1) cryptsetup luksFormat $LOOPDEV ...
6
votes
2answers
13k views

How can I shrink a LUKS partition, what does `cryptsetup resize` do?

I am in progress of resizing a LUKS encrypted partition that contains a single ext4 filesystem (no LVM or something). The cryptsetup FAQ recommends to remove the old partition and recreate it, but ...
6
votes
1answer
1k views

List open dm-crypt LUKS volumes

If I mount a simple loop device, losetup -a give me the devices opened. Is something similar possible with cryptsetup?
6
votes
1answer
1k views

Trying to understand LUKS encryption

I decided to encrypt my root partition with LUKS+LVM. My ThinkPad setup: Samsung 830 128GB SSD 750GB HDD Core 2 Duo 2,5 GHz P9500 8GB RAM But the more I read, the less I understand about those ...
6
votes
1answer
17k views

Why my encrypted LVM volume (LUKS device) won't mount at boot time?

I'm trying to setup an encrypted volume following this guide Everything is setup but mounting the encrypted volume fails at boot-time with the error: fsck.ext4: No such file or directory while ...
6
votes
1answer
318 views

Cryptsetup not finding libgcrypt.so after upgrade

I am running a Fedora Core 13 with dm-crypt + luks, all standard with fedora distos. After upgrading libgcrypt.so, cryptsetup moans at boot up that it can not find the library where it expects it to ...
5
votes
1answer
3k views

LUKS storing keyfile in encrypted usb drive

I already asked once about LUKS unlocking of multiple HDDs in Linux: LUKS and multiple hard drives. Now I would like to know how to secure store the keyfile used for the automatic unlock of the ...
5
votes
2answers
124 views

Creating a large file with random content: short-cut by copying?

Assume I want to create a large encrypted drive stored in a file using cryptsetup, the first step is to create a random file, assume this should be of size 3T: dd if=/dev/urandom of=$FILE bs=1G count=...
5
votes
1answer
2k views

Abysmal general dm-crypt (LUKS) write performance

I am investigating a problem where encrypting a block device imposes a huge performance penalty when writing to it. Hours of Internet reading and experiments did not provide me with a proper ...
4
votes
2answers
468 views

error mounting truecrypt disk with cryptsetup

Trying to use cryptsetup to mount a drive encrypted with truecrypt. Doing this: sudo cryptsetup open --type tcrypt --readonly /dev/sdc1 encrypted_drive and then typing the passphrase gives me: ...
4
votes
2answers
682 views

Can a systemd dependency be applied only to a unit's “ExecStart” action?

I have a scenario where a number of storage volumes are encrypted using keys contained on a removable encrypted USB "keyring" flash drive. I am running Arch Linux and this question is about systemd ...
4
votes
3answers
2k views

Unlock LUKS encrypted Debian root with key file on boot partition

I'm trying to decrypt the Debian root with a key file stored in the boot partition (decrypted partition). This will break the security, but it doesn't matter now. I have to conclude this successfully ...
3
votes
1answer
449 views

cryptdisks_start: precheck failed: the device contains a filesystem type crypto_LUKS

I'm trying to use cryptdisks_start to open a LUKS device that is defined in my /etc/crypttab. Unfortunately, the command fails with the following error message: martin ~ # cryptdisks_start luks-...
3
votes
1answer
31 views

LUKS: 1 master key but multiple passwords and key files?

After reading "man cryptsetup" and many StackExchange questions, I'm confused: Does LUKS use the same master key in each slot? If I execute the commands below, the displayed master key does not ...
3
votes
2answers
752 views

How can I set a label on a dm-crypt+LUKS container?

I just received a new USB flash drive, and set up 2 encrypted partitions on it. I used dm-crypt (LUKS mode) through cryptsetup. With an additional non-encrypted partition, the drive has the following ...
3
votes
1answer
685 views

cryptsetup: dm-crypt plain mode using keyfile AND passphrase

I feel a keyfile and a passphrase provide different benefits. They can not be obtained in the same way (one you need to physically acquire, the other one you need to know). Thus, I think there is ...
3
votes
1answer
454 views

How can move a LUKS container from the middle of a partition to the beginning?

For the tl;dr, skip to the bottom. I have a dual-boot setup with Mac OS X at the beginning of my drive and three GNU/Linux partitions at the end of the drive. I don't have the relevant machine on ...
3
votes
1answer
513 views

losetup /dev/loop0 disappears after some time

at the moment I do some tests with loop devices on Linux/Ubuntu. In a small test script I have the following commands: #!/bin/sh rm testfile.x dd if=/dev/zero of=testfile.x bs=1M count=1200 losetup /...
3
votes
3answers
1k views

How much storage overhead comes along with cryptsetup and ext4?

I want to encrypt the content of a directory in a container with an ext4 filesystem using cryptsetup. The size of the container should be as small as possible and as big as necessary, because I only ...
3
votes
1answer
479 views

Open luks-encrypted partition from virtual DomU LVM disk containing another LVM

I've gotten myself in a bit of a bind, here. A while ago I set up an encrypted Unbuntu 13.04 under Xen. It's virtual disk is an LVM LV. This LV was presented to the DomU as a (whole) physical disk ...
3
votes
1answer
2k views

Booting encrypted root partion fails after system update

I have a problem booting my Debian Linux server. After a system update, GRUB loads the initrd and the system should ask for the password, but it doesn't. Instead, I get dropped to BusyBox. After ...
3
votes
1answer
1k views

How to open multiple LUKS volumes with key entered in initramfs?

I have a Debian 7.4 (stable) based server configured to use an encrypted (RAID1 + LVM) root partition (/boot is un-encrypted regular partition) to which I installed dropbear SSH server so I can ...
3
votes
0answers
151 views

adding encrypted /home in LVM/LUKS

I installed a new (debian) system to an SSD device. After standard install I want to mount /home on the internal HDD. To be able to ask the question, some details: On install I (manually) generated /...
3
votes
0answers
462 views

remap read-only LUKS partition to read-write

cryptsetup can be invoked with --readonly or -r option, which will set up a read-only mapping: cryptsetup --readonly luksOpen /dev/sdb1 sdb1 Once I have opened a device as read-only, can I later re-...
3
votes
0answers
899 views

Unable to close a Luks partition

For backup purposes, I have "snapshotted" a LVM partition. This partition was crypted so I have opened this Luks partition (snapshot) in order to do my backup. The problem is that I have forgotten to ...
2
votes
1answer
27 views

Is there an equivalent of mount -a for cryptsetup?

mount -a will ensure everything in /etc/fstab is mounted (except for noauto entries). Is there an equivalent for cryptsetup, which will unlock everything in /etc/crypttab?
2
votes
1answer
457 views

LUKS: Enter passphrase and nothing happens

I've installed gentoo on my new laptop. I've got an LUKS-encrypted root partition (/dev/sda3). Cryptsetup (USE="gcrypt") is installed. Essential cryptographic API is compiled in kernel. Kernel and ...
2
votes
2answers
448 views

Automatically suspend luks volume after delay

Anyone have any ideas for how I can automatically do a luksSuspend on a luks volume after it's been unused for a certain amount of time. I was thinking of just scheduling a command with crontab or ...
2
votes
0answers
19 views

Cryptsetup hanging after passphrase entered

I am currently looking to recover some data for a friend from an internal HDD removed from a laptop that they had encrypted using LUKS. They can't really tell me much more else as somebody else ...
2
votes
0answers
110 views

LVM partition not mounting

There was a drive failure on a disk in a RAID1 configuration. I removed the bad disk and reconfigured the RAID1 to only use the good disk. When I reboot the machine there are missing LVM partitions. ...
2
votes
0answers
2k views

Accessed a TrueCrypt container without TrueCrypt. What dangers await?

I've got a TrueCrypt volume. In light of the unexpected demise of TrueCrypt, I've been trying to figure out what to do (reading lots of HOWTO websites). I'd like something that is simple and can work ...
1
vote
1answer
100 views

How to add a progress bar to cryptsetup luksFormat?

Example command. cryptsetup --hash sha512 -c aes-xts-plain64 --key-size 512 luksFormat /dev/loop0 This can take quite a while for big files / on slow disks. How to add a progress bar?
1
vote
1answer
96 views

Unable to remove stale volume

I have an external hard drive connected to my Ubuntu laptop via USB. The whole hard drive is LUKS encrypted. Next to the encryption layer sits an LVM volume which I mount to /mnt/es. Once opened, ...
1
vote
2answers
106 views

cryptsetup: Attaching loopback device failed

I am using cryptsetup with detached header. For that I am using the --header parameter, to specify header file. I can open my device using: cryptsetup luksOpen /dev/sdb1 sdb1 --header LUKS-HEADER ...
1
vote
1answer
116 views

Archlinux ARM Rasperry Pi login buffer display and decryption fail

I have put the Archlinux Arm on my SD card and the first time I have done this it was all correct and worked well but I had to "reinstall" everything for several reason. So now I am doing the same ...
1
vote
1answer
235 views

Storing a keyfile in an encrypted LVM

I'm using RHEL 6.5 and I want to encrypt some of my logical volumes (LVM). In order to not have to enter the passphrase multiple times, I want to store a keyfile in an encrypted LV. Example: /var/...
1
vote
1answer
300 views

Cryptsetup: pre-fill the partition with random data

It says it is an optional step, but it is recommended to do this, it improves encryption to pre-fill the partition with random data. What brings security filled with random data? Is it more difficult ...
1
vote
1answer
57 views

Cryptsetup: LVM is missing (on a system without LVM)

So, I have a problem with the partitions setup of my laptop. I will try to include as many details as possible in order to make it easier to help. In the past, I had an ubuntu 15.10 system on my ...
1
vote
1answer
147 views

Encrypt partition and allow qemu to use it as the guest drive

I am trying to encrypt a 25gb partition on my SSD with cryptsetup in such a way that will allow QEMU-KVM to use it as the guests drive. I have tried luksformatting the drive: cryptsetup luksFormat /...
1
vote
1answer
665 views

Enabling FIPS on a luks encrypted CentOS system breaks boot password

For one of my apps I need to enable FIPS for OpenSSL, while simultaneously using software disk encryption. VM #1 I launched a CentOS VM instance which was software encrypted during install. The ...
1
vote
1answer
272 views

luks volume disappears after reboot

I created a separate partition on a CentOS install (VirtualBox), and am attempting to encrypt it using cryptsetup and LUKS. I'm using the following commands to get this set up: cryptsetup luksOpen /...
1
vote
1answer
479 views

Arch mkinitcpio grub boot fails on edit

I'm experiencing this strange behavior. I am using ArchLinux, generated boot things with mkinitcpio, and using Grub2 (not legacy). When booting, and pressing "e" to edit the entry (to see boot ...
1
vote
1answer
129 views

Prevent file access from hanging when luks volume is suspended

I've got a luks volume setup and mounted, and when not in use I suspend it with cryptsetup luksSuspend so it cannot be accessed. But if I forget it's suspended and try to do any kind of file access in ...
1
vote
1answer
32 views

why does systemd cryptsetup try to remount the root partition already mounted?

I have /etc/crypttab as follows: sda7_crypt UUID=<...> /dev/sda8:/keyfile luks,discard,keyscript=/lib/esi/tpm_key_pass sda7_crypt is my root filesystem, so I use update-initramfs to decrypt ...
1
vote
0answers
84 views

Initramfs in debootstrap chroot of fully encrypted system

I'm working on a script to create a fully encrypted washable system from debootstrap. It's doing some good, but the initramfs image that comes out does not pick up the cryptroot properly. After ...
1
vote
1answer
342 views

howto interpret `cryptsetup benchmark` results?

summary: I can run cryptsetup benchmark and sort the results, but seek guidance in their interpretation. E.g., should I give more weight to encryption speed or decryption speed? Should key-derivation ...
1
vote
1answer
92 views

Waiting long (few minutes) during boot for cryptsetup for password prompt

I have LVM on the top cryptsetup on my Debian unstable amd64. A week ago after upgrade my initramfs changed and now I have to wait few minutes at the beginning of the boot before cryptsetup asked for ...
1
vote
0answers
308 views

Difference between cryptopts and crypttab

I'm setting up an encrypted root fs, which I've done before, but this time I'm using a PGP-encrypted keyfile with a symmetric password to familiarize myself with the process. There are two places ...
1
vote
0answers
495 views

crypttab and veracrypt

I dual boot Fedora and Windows Vista and want them to share a partition so that I can work on the same files in both Linux and Windows, and I need everything to be encrypted. I encrypted the shared ...
1
vote
1answer
482 views

cryptsetup luksFormat - cannot open device for read-only access

I created a new partition that I would like to encrypt with LUKS. The device is a 1GB partition with ID 83 (Linux). I've changed the owner to root, and chmod to 777. The command I'm using is : ...