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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 08:06:26 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 08:06:26 +0000
commit1660d4b7a65d9ad2ce0deaa19d35579ca4084ac5 (patch)
tree6cf8220b628ebd2ccfc1375dd6516c6996e9abcc /docs/v2.6.0-ReleaseNotes
parentInitial commit. (diff)
downloadcryptsetup-1660d4b7a65d9ad2ce0deaa19d35579ca4084ac5.tar.xz
cryptsetup-1660d4b7a65d9ad2ce0deaa19d35579ca4084ac5.zip
Adding upstream version 2:2.6.1.upstream/2%2.6.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+Cryptsetup 2.6.0 Release Notes
+==============================
+Stable release with new features and bug fixes.
+
+Changes since version 2.5.0
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+* Introduce support for handling macOS FileVault2 devices (FVAULT2).
+
+ Cryptsetup now supports the mapping of FileVault2 full-disk encryption
+ by Apple for the macOS operating system using a native Linux kernel.
+ You can open an existing USB FileVault portable device and (with
+ the hfsplus filesystem driver) access the native data read/write.
+
+ Cryptsetup supports only (legacy) FileVault2 based on Core Storage
+ and HFS+ filesystem (introduced in MacOS X 10.7 Lion).
+ It does NOT support the new version of FileVault based on the APFS
+ filesystem used in recent macOS versions.
+
+ Header formatting and changes are not supported; cryptsetup never
+ changes the metadata on the device.
+
+ FVAULT2 extension requires kernel userspace crypto API and kernel
+ driver for HFS+ (hfsplus) filesystem (available on most systems today).
+
+ Example of using FileVault2 formatted USB device:
+
+ A typical encrypted device contains three partitions; the FileVault
+ encrypted partition is here sda2:
+
+ $ lsblk -o NAME,FSTYPE,LABEL /dev/sda
+ NAME FSTYPE LABEL
+ sda
+ |-sda1 vfat EFI
+ |-sda2
+ `-sda3 hfsplus Boot OS X
+
+ Note: blkid does not recognize FileVault2 format yet.
+
+ To dump metadata information about the device, you can use
+ the fvault2Dump command:
+
+ $ cryptsetup fvault2Dump /dev/sda2
+ Header information for FVAULT2 device /dev/sda2.
+ Physical volume UUID: 6f353c05-daae-4e76-a0ee-6a9569a22d81
+ Family UUID: f82cceb0-a788-4815-945a-53d57fcd55a8
+ Logical volume offset: 67108864 [bytes]
+ Logical volume size: 3288334336 [bytes]
+ Cipher: aes
+ Cipher mode: xts-plain64
+ PBKDF2 iterations: 97962
+ PBKDF2 salt: 173a4ec7447662ec79ca7a47df6c2a01
+
+ To activate the device, use open --type fvault2 option:
+
+ $ cryptsetup open --type fvault2 /dev/sda2 test
+ Enter passphrase for /dev/sda2: ...
+
+ And check the status of the active device:
+
+ $ cryptsetup status test
+ /dev/mapper/test is active.
+ type: FVAULT2
+ cipher: aes-xts-plain64
+ keysize: 256 bits
+ key location: dm-crypt
+ device: /dev/sda2
+ sector size: 512
+ offset: 131072 sectors
+ size: 6422528 sectors
+ mode: read/write
+
+ Now, if the kernel contains hfsplus filesystem driver, you can mount
+ decrypted content:
+
+ $ mount /dev/mapper/test /mnt/test
+
+ For more info about implementation, please refer to the master thesis
+ by Pavel Tobias, which was the source for this extension.
+ https://is.muni.cz/th/p0aok/?lang=en
+
+* libcryptsetup: no longer use global memory locking through mlockall()
+
+ For many years, libcryptsetup locked all memory (including dependent
+ library address space) to prevent swapping sensitive content outside
+ of RAM.
+
+ This strategy no longer works as the locking of basic libraries exceeds
+ the memory locking limit if running as a non-root user.
+
+ Libcryptsetup now locks only memory ranges containing sensitive
+ material (keys) through crypt_safe_alloc() calls.
+
+ This change solves many reported mysterious problems of unexpected
+ failures. If the initial lock was still under the limit and succeeded,
+ some following memory allocation could fail later as it exceeded
+ the locking limit. If the initial locking fails, memory locking
+ was quietly ignored completely.
+
+ The whole crypt_memory_lock() API call is deprecated; it no longer
+ calls memlockall().
+
+* libcryptsetup: process priority is increased only for key derivation
+ (PBKDF) calls.
+
+ Increasing priority was tight to memory locking and works only if
+ running under superuser.
+ Only PBKDF calls and benchmarking now increase the process priority.
+
+* Add new LUKS keyslot context handling functions and API.
+
+ In practice, the luksAddKey action does two operations.
+ It unlocks the existing device volume key and stores the unlocked
+ volume key in a new keyslot.
+ Previously the options were limited to key files and passphrases.
+
+ Newly available methods (keyslot contexts) are passphrase, keyfile,
+ key (binary representation), and LUKS2 token.
+
+ To unlock a keyslot user may:
+ - provide existing passphrase via interactive prompt (default method)
+ - use --key-file option to provide a file with a valid passphrase
+ - provide volume key directly via --volume-key-file
+ - unlock keyslot via all available LUKS2 tokens by --token-only
+ - unlock keyslot via specific token with --token-id
+ - unlock keyslot via specific token type by --token-type
+
+ To provide the passphrase for a new keyslot, a user may:
+ - provide existing passphrase via interactive prompt (default method)
+ - use --new-keyfile to read the passphrase from the file
+ - use --new-token-id to select LUKS2 token to get passphrase
+ for new keyslot. The new keyslot is assigned to the selected token
+ id if the operation is successful.
+
+* The volume key may now be extracted using a passphrase, keyfile, or
+ token. For LUKS devices, it also returns the volume key after
+ a successful crypt_format call.
+
+* Fix --disable-luks2-reencryption configuration option.
+
+* cryptsetup: Print a better error message and warning if the format
+ produces an image without space available for data.
+
+ Activation now fails early with a more descriptive message.
+
+* Print error if anti-forensic LUKS2 hash setting is not available.
+ If the specified hash was not available, activation quietly failed.
+
+* Fix internal crypt segment compare routine if the user
+ specified cipher in kernel format (capi: prefix).
+
+* cryptsetup: Add token unassign action.
+
+ This action allows removing token binding on specific keyslot.
+
+* veritysetup: add support for --use-tasklets option.
+
+ This option sets try_verify_in_tasklet kernel dm-verity option
+ (available since Linux kernel 6.0) to allow some performance
+ improvement on specific systems.
+
+* Provide pkgconfig Require.private settings.
+
+ While we do not completely provide static build on udev systems,
+ it helps produce statically linked binaries in certain situations.
+
+* Always update automake library files if autogen.sh is run.
+
+ For several releases, we distributed older automake scripts by mistake.
+
+* reencryption: Fix user defined moved segment size in LUKS2 decryption.
+
+ The --hotzone-size argument was ignored in cases where the actual data
+ size was less than the original LUKS2 data offset.
+
+* Delegate FIPS mode detection to configured crypto backend.
+ System FIPS mode check no longer depends on /etc/system-fips file.
+
+* tests: externally provided systemd plugin is now optionally compiled
+ from systemd git and tested with cryptsetup
+
+* tests: initial integration to OSS-fuzz project with basic crypt_load()
+ test for LUKS2 and JSON mutated fuzzing.
+
+ For more info, see README in tests/fuzz directory.
+
+* Update documentation, including FAQ and man pages.
+
+Libcryptsetup API extensions
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The libcryptsetup API is backward compatible with existing symbols.
+
+New symbols:
+ crypt_keyslot_context_init_by_passphrase
+ crypt_keyslot_context_init_by_keyfile
+ crypt_keyslot_context_init_by_token
+ crypt_keyslot_context_init_by_volume_key
+ crypt_keyslot_context_get_error
+ crypt_keyslot_context_set_pin
+ crypt_keyslot_context_get_type
+ crypt_keyslot_context_free
+ crypt_keyslot_add_by_keyslot_context
+ crypt_volume_key_get_by_keyslot_context
+
+New defines:
+ CRYPT_FVAULT2 "FVAULT2" (FileVault2 compatible mode)
+
+Keyslot context types:
+ CRYPT_KC_TYPE_PASSPHRASE
+ CRYPT_KC_TYPE_KEYFILE
+ CRYPT_KC_TYPE_TOKEN
+ CRYPT_KC_TYPE_KEY
+
+ CRYPT_ACTIVATE_TASKLETS (dm-verity: use tasklets activation flag)
+
+WARNING!
+~~~~~~~~
+The next version of cryptsetup will change the encryption mode and key
+derivation option for the PLAIN format.
+
+This change will cause backward incompatibility.
+For this reason, the user will have to specify the exact parameters
+for cipher, key size, and key derivation parameters for plain format.
+
+The default encryption mode will be AES-XTS with 512bit key (AES-256).
+The CBC mode is no longer considered the best default, as it allows easy
+bit-flipped ciphertext modification attacks and performance problems.
+
+For the passphrase hashing in plain mode, the encryption key is directly
+derived through iterative hashing from a user-provided passphrase
+(except a keyfile that is not hashed).
+
+The default hash is RIPEMD160, which is no longer the best default
+option. The exact change will be yet discussed but should include
+the possibility of using a password-based key derivation function
+instead of iterative hashing.