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file-systems: Handle LUKS2 header.

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* gnu/build/file-systems.scm (luks-superblock?): Handle LUKS2 header.

Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>
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David Trudgian 2020-01-04 09:19:17 -06:00 • committed by Danny Milosavljevic
parent 7f16122efd
commit 7aa28eb339
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1 changed files with 11 additions and 2 deletions
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13
gnu/build/file-systems.scm
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@ -4,6 +4,7 @@
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019 Guillaume Le Vaillant <glv@posteo.net>
;;; Copyright © 2019 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2019 David C. Trudgian <dave@trudgian.net>
;;;
;;; This file is part of GNU Guix.
;;;
@ -343,6 +344,10 @@ if DEVICE does not contain a JFS file system."
;; <https://gitlab.com/cryptsetup/cryptsetup/wikis/Specification>. We follow
;; version 1.2.1 of this document.
;; The LUKS2 header format is described in "LUKS2 On-Disk Format Specification":
;; <https://gitlab.com/cryptsetup/LUKS2-docs/blob/master/luks2_doc_wip.pdf>.
;; It is a WIP document.
(define-syntax %luks-endianness
;; Endianness of LUKS headers.
(identifier-syntax (endianness big)))
@ -356,12 +361,16 @@ if DEVICE does not contain a JFS file system."
(let ((magic (sub-bytevector sblock 0 6))
(version (bytevector-u16-ref sblock 6 %luks-endianness)))
(and (bytevector=? magic %luks-magic)
(= version 1))))
(or (= version 1) (= version 2)))))
(define (read-luks-header file)
"Read a LUKS header from FILE. Return the raw header on success, and #f if
not valid header was found."
;; Size in bytes of the LUKS header, including key slots.
;; Size in bytes of the LUKS binary header, which includes key slots in
;; LUKS1. In LUKS2 the binary header is partially backward compatible, so
;; that UUID can be extracted as for LUKS1. Keyslots and other metadata are
;; not part of this header in LUKS2, but are included in the JSON metadata
;; area that follows.
(read-superblock file 0 592 luks-superblock?))
(define (luks-header-uuid header)