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authorDavid Trudgian <dave@trudgian.net>2020-01-04 09:19:17 -0600
committerDanny Milosavljevic <dannym@scratchpost.org>2020-01-05 11:14:00 +0100
commit7aa28eb339dd667d07cfb8b5347e159d5da3ccd7 (patch)
tree05b2af8453b524d97d1ddfd6c45ea4b395f3b2d9 /gnu/build
parent7f16122efd59472ecc63a231054471c2bad5a46b (diff)
downloadguix-7aa28eb339dd667d07cfb8b5347e159d5da3ccd7.tar.gz
file-systems: Handle LUKS2 header.
* gnu/build/file-systems.scm (luks-superblock?): Handle LUKS2 header.

Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>
Diffstat (limited to 'gnu/build')
-rw-r--r--gnu/build/file-systems.scm13
1 files changed, 11 insertions, 2 deletions
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index 9299cc2e4c..ee6375515f 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -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)