Difference between revisions of "Dm-crypt"

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(two links are to an old untranslated copy of the article, that content is now in dm-crypt/Device Encryption linked above; the third link was to the old talk page, now in Talk:dm-crypt: if that discussion is useful it must be merged to a subpage)
m (Swap device encryption: grammar)
 
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{{Lowercase title}}
 
{{Lowercase title}}
[[Category:Security]]
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[[Category:Encryption]]
 
[[Category:File systems]]
 
[[Category:File systems]]
[[de:ArchLinux mit verschlüsseltem LVM und Systemd]]
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[[de:dm-crypt]]
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[[es:Dm-crypt]]
 
[[fr:LUKS]]
 
[[fr:LUKS]]
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[[it:Dm-crypt with LUKS]]
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[[ja:Dm-crypt]]
 
[[ru:System Encryption with LUKS]]
 
[[ru:System Encryption with LUKS]]
 
[[zh-CN:Dm-crypt]]
 
[[zh-CN:Dm-crypt]]
 
{{Related articles start}}
 
{{Related articles start}}
{{Related|Disk Encryption}}
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{{Related|Disk encryption}}
 
{{Related|Removing System Encryption}}
 
{{Related|Removing System Encryption}}
 
{{Related articles end}}
 
{{Related articles end}}
This article focuses on how to set up encryption on Arch Linux using ''dm-crypt'', which is the standard device-mapper encryption functionality provided by the Linux kernel.
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From the cryptsetup project's [https://gitlab.com/cryptsetup/cryptsetup/wikis/DMCrypt wiki]:
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:Device-mapper is infrastructure in the Linux 2.6 and 3.x kernel that provides a generic way to create virtual layers of block devices. Device-mapper crypt target provides transparent encryption of block devices using the kernel crypto API. The user can basically specify one of the symmetric ciphers, an encryption mode, a key (of any allowed size), an iv generation mode and then the user can create a new block device in /dev. Writes to this device will be encrypted and reads decrypted. You can mount your filesystem on it as usual or stack dm-crypt device with another device like RAID or LVM volume. Basic documentation of dm-crypt mapping table comes with kernel source and the latest version is available in git repository.
  
 
==Common scenarios==
 
==Common scenarios==
This section introduces common scenarios to employ ''dm-crypt'' to encrypt a system or individual filesystem mount points. The scenarios cross-link to the other subpages where needed. It is meant as starting point to familiarize with different practical encryption procedures.
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This part introduces common scenarios to employ ''dm-crypt'' to encrypt a system or individual filesystem mount points. It is meant as starting point to familiarize with different practical encryption procedures. The scenarios cross-link to the other subpages where needed. 
  
See [[Dm-crypt/Encrypting a Non-Root File System]] if you need to encrypt a device that is not used for booting a system, like a [[Dm-crypt/Encrypting a Non-Root File System#Partition|partition]] or a [[Dm-crypt/Encrypting a Non-Root File System#Loop device|loop device]].
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See [[Dm-crypt/Encrypting a non-root file system]] if you need to encrypt a device that is not used for booting a system, like a [[Dm-crypt/Encrypting a non-root file system#Partition|partition]] or a [[Dm-crypt/Encrypting a non-root file system#Loop device|loop device]].
  
See [[Dm-crypt/Encrypting an Entire System]] if you want to encrypt an entire system, in particular a root partition. Several scenarios are covered, including the use of ''dm-crypt'' with the ''LUKS'' extension, ''plain'' mode encryption and encryption and ''LVM''.
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See [[Dm-crypt/Encrypting an entire system]] if you want to encrypt an entire system, in particular a root partition. Several scenarios are covered, including the use of ''dm-crypt'' with the ''LUKS'' extension, ''plain'' mode encryption and encryption and ''LVM''.
  
 
==Drive preparation==
 
==Drive preparation==
This step will deal with operations like [[Dm-crypt/Drive Preparation#Secure erasure of the hard disk drive|securely erasing the drive]] and [[Dm-crypt/Drive Preparation#Partitioning|partitioning it]].
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[[Dm-crypt/Drive preparation]] deals with operations like [[Dm-crypt/Drive preparation#Secure erasure of the hard disk drive|securely erasing the drive]] and ''dm-crypt'' specific points for [[Dm-crypt/Drive preparation#Partitioning|partitioning it]].  
 
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See [[Dm-crypt/Drive Preparation]].
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==Device encryption==
 
==Device encryption==
This section covers how to manually utilize dm-crypt to encrypt a system through the [[dm-crypt/Device Encryption#Cryptsetup usage|cryptsetup]] command, also dealing with the usage of [[dm-crypt/Device Encryption#Cryptsetup actions specific for LUKS|LUKS]] and [[dm-crypt/Device Encryption#Cryptsetup and keyfiles|keyfiles]].
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[[Dm-crypt/Device encryption]] covers how to manually utilize dm-crypt to encrypt a system through the [[dm-crypt/Device encryption#Cryptsetup usage|cryptsetup]] command. It covers examples of the [[Dm-crypt/Device encryption#Encryption options with dm-crypt|Encryption options with dm-crypt]], deals with the creation of [[dm-crypt/Device encryption#Keyfiles|keyfiles]], LUKS specific commands for [[Dm-crypt/Device_encryption#Key_management|key management]] as well as for  [[Dm-crypt/Device_encryption#Backup_and_restore|Backup and restore]].  
 
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See [[Dm-crypt/Device Encryption]].
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==System configuration==
 
==System configuration==
This page illustrates how to configure [[Dm-crypt/System Configuration#mkinitcpio|mkinitcpio]], the [[Dm-crypt/System Configuration#Boot loader|boot loader]] and the [[Dm-crypt/System Configuration#crypttab|crypttab]] file when encrypting a system.
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[[Dm-crypt/System configuration]] illustrates how to configure [[Dm-crypt/System configuration#mkinitcpio|mkinitcpio]], the [[Dm-crypt/System configuration#Boot loader|boot loader]] and the [[Dm-crypt/System configuration#crypttab|crypttab]] file when encrypting a system.
 
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See [[Dm-crypt/System Configuration]].
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==Swap device encryption==
 
==Swap device encryption==
A swap partition may be added to an encrypted system, if required. The swap partition must be encrypted as well to protect any data swapped out by the system. This part details methods [[Dm-crypt_with_LUKS/Swap_Encryption#Without_suspend-to-disk_support|without]] and [[Dm-crypt_with_LUKS/Swap_Encryption#With_suspend-to-disk_support|with]] suspend-to-disk support.
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[[Dm-crypt/Swap encryption]] covers how to add a swap partition to an encrypted system, if required. The swap partition must be encrypted as well to protect any data swapped out by the system. This part details methods [[Dm-crypt_with_LUKS/Swap_Encryption#Without_suspend-to-disk_support|without]] and [[Dm-crypt_with_LUKS/Swap_Encryption#With_suspend-to-disk_support|with]] suspend-to-disk support.
 
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See [[Dm-crypt/Swap Encryption]].
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==Specialties==
 
==Specialties==
This part deals with special operations like [[Dm-crypt/Specialties#Securing the unencrypted boot partition|securing the unencrypted boot partition]], [[Dm-crypt/Specialties#Using GPG or OpenSSL Encrypted Keyfiles|using GPG or OpenSSL encrypted keyfiles]], a method to [[Dm-crypt/Specialties#Remote_unlocking_of_the_root_.28or_other.29_partition|boot and unlock via the network]], or [[Dm-crypt/Specialties#Discard.2FTRIM_support_for_solid_state_disks_.28SSD.29|setting up discard/TRIM for a SSD]].
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[[Dm-crypt/Specialties]] deals with special operations like [[Dm-crypt/Specialties#Securing the unencrypted boot partition|securing the unencrypted boot partition]], [[Dm-crypt/Specialties#Using GPG or OpenSSL Encrypted Keyfiles|using GPG or OpenSSL encrypted keyfiles]], a method to [[Dm-crypt/Specialties#Remote_unlocking_of_the_root_.28or_other.29_partition|boot and unlock via the network]], another for [[Dm-crypt/Specialties#Discard.2FTRIM_support_for_solid_state_drives_.28SSD.29|setting up discard/TRIM for a SSD]], and sections dealing with [[Dm-crypt/Specialties#The_encrypt_hook_and_multiple_disks|the encrypt hook and multiple disks]].  
 
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See [[Dm-crypt/Specialties]].
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== See also ==
 
== See also ==
* [http://code.google.com/p/cryptsetup/wiki/FrequentlyAskedQuestions cryptsetup FAQ] - The main and foremost help resource, directly from the developers.
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* [https://gitlab.com/cryptsetup/cryptsetup/wikis/DMCrypt dm-crypt] - The project homepage
* [http://www.freeotfe.org/ FreeOTFE] - Supports unlocking LUKS encrypted volumes in Microsoft Windows.
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* [https://gitlab.com/cryptsetup/cryptsetup cryptsetup] - The LUKS homepage and [https://gitlab.com/cryptsetup/cryptsetup/wikis/FrequentlyAskedQuestions FAQ] - the main and foremost help resource.  
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* [https://git.kernel.org/cgit/utils/cryptsetup/cryptsetup.git/ cryptsetup repository] and [https://www.kernel.org/pub/linux/utils/cryptsetup/ release] archive.
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* [https://github.com/t-d-k/doxbox DOXBOX] - Supports unlocking LUKS encrypted volumes in Microsoft Windows.

Latest revision as of 08:47, 15 February 2016

From the cryptsetup project's wiki:

Device-mapper is infrastructure in the Linux 2.6 and 3.x kernel that provides a generic way to create virtual layers of block devices. Device-mapper crypt target provides transparent encryption of block devices using the kernel crypto API. The user can basically specify one of the symmetric ciphers, an encryption mode, a key (of any allowed size), an iv generation mode and then the user can create a new block device in /dev. Writes to this device will be encrypted and reads decrypted. You can mount your filesystem on it as usual or stack dm-crypt device with another device like RAID or LVM volume. Basic documentation of dm-crypt mapping table comes with kernel source and the latest version is available in git repository.

Common scenarios

This part introduces common scenarios to employ dm-crypt to encrypt a system or individual filesystem mount points. It is meant as starting point to familiarize with different practical encryption procedures. The scenarios cross-link to the other subpages where needed.

See Dm-crypt/Encrypting a non-root file system if you need to encrypt a device that is not used for booting a system, like a partition or a loop device.

See Dm-crypt/Encrypting an entire system if you want to encrypt an entire system, in particular a root partition. Several scenarios are covered, including the use of dm-crypt with the LUKS extension, plain mode encryption and encryption and LVM.

Drive preparation

Dm-crypt/Drive preparation deals with operations like securely erasing the drive and dm-crypt specific points for partitioning it.

Device encryption

Dm-crypt/Device encryption covers how to manually utilize dm-crypt to encrypt a system through the cryptsetup command. It covers examples of the Encryption options with dm-crypt, deals with the creation of keyfiles, LUKS specific commands for key management as well as for Backup and restore.

System configuration

Dm-crypt/System configuration illustrates how to configure mkinitcpio, the boot loader and the crypttab file when encrypting a system.

Swap device encryption

Dm-crypt/Swap encryption covers how to add a swap partition to an encrypted system, if required. The swap partition must be encrypted as well to protect any data swapped out by the system. This part details methods without and with suspend-to-disk support.

Specialties

Dm-crypt/Specialties deals with special operations like securing the unencrypted boot partition, using GPG or OpenSSL encrypted keyfiles, a method to boot and unlock via the network, another for setting up discard/TRIM for a SSD, and sections dealing with the encrypt hook and multiple disks.

See also