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diff --git a/docs/v2.1.0-ReleaseNotes b/docs/v2.1.0-ReleaseNotes new file mode 100644 index 0000000..36d2247 --- /dev/null +++ b/docs/v2.1.0-ReleaseNotes @@ -0,0 +1,210 @@ +Cryptsetup 2.1.0 Release Notes +============================== +Stable release with new features and bug fixes. + +Cryptsetup 2.1 version uses a new on-disk LUKS2 format as the default +LUKS format and increases default LUKS2 header size. + +The legacy LUKS (referenced as LUKS1) will be fully supported forever +as well as a traditional and fully backward compatible format. + +When upgrading a stable distribution, please use configure option +--with-default-luks-format=LUKS1 to maintain backward compatibility. + +This release also switches to OpenSSL as a default cryptographic +backend for LUKS header processing. Use --with-crypto_backend=gcrypt +configure option if you need to preserve legacy libgcrypt backend. + +Please do not use LUKS2 without properly configured backup or +in production systems that need to be compatible with older systems. + +Changes since version 2.0.6 +~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +* The default for cryptsetup LUKS format action is now LUKS2. + You can use LUKS1 with cryptsetup option --type luks1. + +* The default size of the LUKS2 header is increased to 16 MB. + It includes metadata and the area used for binary keyslots; + it means that LUKS header backup is now 16MB in size. + + Note, that used keyslot area is much smaller, but this increase + of reserved space allows implementation of later extensions + (like online reencryption). + It is fully compatible with older cryptsetup 2.0.x versions. + If you require to create LUKS2 header with the same size as + in the 2.0.x version, use --offset 8192 option for luksFormat + (units are in 512-bytes sectors; see notes below). + +* Cryptsetup now doubles LUKS default key size if XTS mode is used + (XTS mode uses two internal keys). This does not apply if key size + is explicitly specified on the command line and it does not apply + for the plain mode. + This fixes a confusion with AES and 256bit key in XTS mode where + code used AES128 and not AES256 as often expected. + + Also, the default keyslot encryption algorithm (if cannot be derived + from data encryption algorithm) is now available as configure + options --with-luks2-keyslot-cipher and --with-luks2-keyslot-keybits. + The default is aes-xts-plain64 with 2 * 256-bits key. + +* Default cryptographic backend used for LUKS header processing is now + OpenSSL. For years, OpenSSL provided better performance for PBKDF. + + NOTE: Cryptsetup/libcryptsetup supports several cryptographic + library backends. The fully supported are libgcrypt, OpenSSL and + kernel crypto API. FIPS mode extensions are maintained only for + libgcrypt and OpenSSL. Nettle and NSS are usable only for some + subset of algorithms and cannot provide full backward compatibility. + You can always switch to other backends by using a configure switch, + for libgcrypt (compatibility for older distributions) use: + --with-crypto_backend=gcrypt + +* The Python bindings are no longer supported and the code was removed + from cryptsetup distribution. Please use the libblockdev project + that already covers most of the libcryptsetup functionality + including LUKS2. + +* Cryptsetup now allows using --offset option also for luksFormat. + It means that the specified offset value is used for data offset. + LUKS2 header areas are automatically adjusted according to this value. + (Note units are in 512-byte sectors due to the previous definition + of this option in plain mode.) + This option can replace --align-payload with absolute alignment value. + +* Cryptsetup now supports new refresh action (that is the alias for + "open --refresh"). + It allows changes of parameters for an active device (like root + device mapping), for example, it can enable or disable TRIM support + on-the-fly. + It is supported for LUKS1, LUKS2, plain and loop-AES devices. + +* Integritysetup now supports mode with detached data device through + new --data-device option. + Since kernel 4.18 there is a possibility to specify external data + device for dm-integrity that stores all integrity tags. + +* Integritysetup now supports automatic integrity recalculation + through new --integrity-recalculate option. + Linux kernel since version 4.18 supports automatic background + recalculation of integrity tags for dm-integrity. + +Other changes and fixes +~~~~~~~~~~~~~~~~~~~~~~~ + +* Fix for crypt_wipe call to allocate space if the header is backed + by a file. This means that if you use detached header file, it will + now have always the full size after luksFormat, even if only + a few keyslots are used. + +* Fixes to offline cryptsetup-reencrypt to preserve LUKS2 keyslots + area sizes after reencryption and fixes for some other issues when + creating temporary reencryption headers. + +* Added some FIPS mode workarounds. We cannot (yet) use Argon2 in + FIPS mode, libcryptsetup now fallbacks to use PBKDF2 in FIPS mode. + +* Rejects conversion to LUKS1 if PBKDF2 hash algorithms + in keyslots differ. + +* The hash setting on command line now applies also to LUKS2 PBKDF2 + digest. In previous versions, the LUKS2 key digest used PBKDF2-SHA256 + (except for converted headers). + +* Allow LUKS2 keyslots area to increase if data offset allows it. + Cryptsetup can fine-tune LUKS2 metadata area sizes through + --luks2-metadata-size=BYTES and --luks2-keyslots-size=BYTES. + Please DO NOT use these low-level options until you need it for + some very specific additional feature. + Also, the code now prints these LUKS2 header area sizes in dump + command. + +* For LUKS2, keyslot can use different encryption that data with + new options --keyslot-key-size=BITS and --keyslot-cipher=STRING + in all commands that create new LUKS keyslot. + Please DO NOT use these low-level options until you need it for + some very specific additional feature. + +* Code now avoids data flush when reading device status through + device-mapper. + +* The Nettle crypto backend and the userspace kernel crypto API + backend were enhanced to allow more available hash functions + (like SHA3 variants). + +* Upstream code now does not require libgcrypt-devel + for autoconfigure, because OpenSSL is the default. + The libgcrypt does not use standard pkgconfig detection and + requires specific macro (part of libgcrypt development files) + to be always present during autoconfigure. + With other crypto backends, like OpenSSL, this makes no sense, + so this part of autoconfigure is now optional. + +* Cryptsetup now understands new --debug-json option that allows + an additional dump of some JSON information. These are no longer + present in standard debug output because it could contain some + specific LUKS header parameters. + +* The luksDump contains the hash algorithm used in Anti-Forensic + function. + +* All debug messages are now sent through configured log callback + functions, so an application can easily use own debug messages + handling. In previous versions debug messages were printed directly + to standard output.) + +Libcryptsetup API additions +~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +These new calls are now exported, for details see libcryptsetup.h: + + * crypt_init_data_device + * crypt_get_metadata_device_name + functions to init devices with separate metadata and data device + before a format function is called. + + * crypt_set_data_offset + sets the data offset for LUKS to the specified value + in 512-byte sectors. + It should replace alignment calculation in LUKS param structures. + + * crypt_get_metadata_size + * crypt_set_metadata_size + allows to set/get area sizes in LUKS header + (according to specification). + + * crypt_get_default_type + get default compiled-in LUKS type (version). + + * crypt_get_pbkdf_type_params + allows to get compiled-in PBKDF parameters. + + * crypt_keyslot_set_encryption + * crypt_keyslot_get_encryption + allows to set/get per-keyslot encryption algorithm for LUKS2. + + * crypt_keyslot_get_pbkdf + allows to get PBKDF parameters per-keyslot. + + and these new defines: + * CRYPT_LOG_DEBUG_JSON (message type for JSON debug) + * CRYPT_DEBUG_JSON (log level for JSON debug) + * CRYPT_ACTIVATE_RECALCULATE (dm-integrity recalculate flag) + * CRYPT_ACTIVATE_REFRESH (new open with refresh flag) + +All existing API calls should remain backward compatible. + +Unfinished things & TODO for next releases +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +* Optional authenticated encryption is still an experimental feature + and can have performance problems for high-speed devices and device + with larger IO blocks (like RAID). + +* Authenticated encryption does not use encryption for a dm-integrity + journal. While it does not influence data confidentiality or + integrity protection, an attacker can get some more information + from data journal or cause that system will corrupt sectors after + journal replay. (That corruption will be detected though.) + +* The LUKS2 metadata area increase is mainly needed for the new online + reencryption as the major feature for the next release. |