diff --git a/doc/user-guide/06-layout-configuration.adoc b/doc/user-guide/06-layout-configuration.adoc
index f59384db..88ba0420 100644
--- a/doc/user-guide/06-layout-configuration.adoc
+++ b/doc/user-guide/06-layout-configuration.adoc
@@ -630,7 +630,7 @@ lvmvol <volume_group> <name> <size(bytes)> <layout> [key:value ...]
=== LUKS Devices ===
----------------------------------
-crypt /dev/mapper/<name> <device> [cipher=<cipher>] [key_size=<key size>] [hash=<hash function>] [uuid=<uuid>] [keyfile=<keyfile>] [password=<password>]
+crypt /dev/mapper/<name> <device> [type=<type>] [cipher=<cipher>] [key_size=<key size>] [hash=<hash function>] [uuid=<uuid>] [keyfile=<keyfile>] [password=<password>]
----------------------------------
=== DRBD ===
diff --git a/usr/share/rear/layout/prepare/GNU/Linux/160_include_luks_code.sh b/usr/share/rear/layout/prepare/GNU/Linux/160_include_luks_code.sh
index 05279bc8..0c662f67 100644
--- a/usr/share/rear/layout/prepare/GNU/Linux/160_include_luks_code.sh
+++ b/usr/share/rear/layout/prepare/GNU/Linux/160_include_luks_code.sh
@@ -1,35 +1,75 @@
+
# Code to recreate and/or open LUKS volumes.
create_crypt() {
+ # See the create_device() function in lib/layout-functions.sh what "device type" means:
+ local device_type="$1"
+ if ! grep -q "^crypt $device_type " "$LAYOUT_FILE" ; then
+ LogPrintError "Skip recreating LUKS volume $device_type (no 'crypt $device_type' entry in $LAYOUT_FILE)"
+ # FIXME: The return code is ignored in the create_device() function in lib/layout-functions.sh:
+ return 1
+ fi
+
local crypt target_device source_device options
- read crypt target_device source_device options < <(grep "^crypt $1 " "$LAYOUT_FILE")
+ local mapping_name option key value
+ local cryptsetup_options="" keyfile="" password=""
- local target_name=${target_device#/dev/mapper/}
+ read crypt target_device source_device options < <( grep "^crypt $device_type " "$LAYOUT_FILE" )
+
+ # Careful! One cannot 'test -b $source_device' here at the time when this code is run
+ # because the source device is usually a disk partition block device like /dev/sda2
+ # but disk partition block devices usually do not yet exist (in particular not on a new clean disk)
+ # because partitions are actually created later when the diskrestore.sh script is run
+ # but not here when this code is run which only generates the diskrestore.sh script:
+ if ! test $source_device ; then
+ LogPrintError "Skip recreating LUKS volume $device_type: No source device (see the 'crypt $device_type' entry in $LAYOUT_FILE)"
+ # FIXME: The return code is ignored in the create_device() function in lib/layout-functions.sh:
+ return 1
+ fi
+
+ mapping_name=${target_device#/dev/mapper/}
+ if ! test $mapping_name ; then
+ LogPrintError "Skip recreating LUKS volume $device_type on $source_device: No /dev/mapper/... mapping name (see the 'crypt $device_type' entry in $LAYOUT_FILE)"
+ # FIXME: The return code is ignored in the create_device() function in lib/layout-functions.sh:
+ return 1
+ fi
- local cryptsetup_options="" keyfile="" password=""
- local option key value
for option in $options ; do
- key=${option%=*}
+ # $option is of the form keyword=value and
+ # we assume keyword has no '=' character but value could be anything that may have a '=' character
+ # so we split keyword=value at the leftmost '=' character so that
+ # e.g. keyword=foo=bar gets split into key="keyword" and value="foo=bar":
+ key=${option%%=*}
value=${option#*=}
-
+ # The "cryptseup luksFormat" command does not require any of the type, cipher, key-size, hash, uuid option values
+ # because if omitted a cryptseup default value is used so we treat those values as optional.
+ # Using plain test to ensure the value is a single non empty and non blank word
+ # without quoting because test " " would return zero exit code
+ # cf. "Beware of the emptiness" in https://github.com/rear/rear/wiki/Coding-Style
case "$key" in
- cipher)
- cryptsetup_options+=" --cipher $value"
+ (type)
+ test $value && cryptsetup_options+=" --type $value"
+ ;;
+ (cipher)
+ test $value && cryptsetup_options+=" --cipher $value"
+ ;;
+ (key_size)
+ test $value && cryptsetup_options+=" --key-size $value"
;;
- key_size)
- cryptsetup_options+=" --key-size $value"
+ (hash)
+ test $value && cryptsetup_options+=" --hash $value"
;;
- hash)
- cryptsetup_options+=" --hash $value"
+ (uuid)
+ test $value && cryptsetup_options+=" --uuid $value"
;;
- uuid)
- cryptsetup_options+=" --uuid $value"
+ (keyfile)
+ test $value && keyfile=$value
;;
- keyfile)
- keyfile=$value
+ (password)
+ test $value && password=$value
;;
- password)
- password=$value
+ (*)
+ LogPrintError "Skipping unsupported LUKS cryptsetup option '$key' in 'crypt $target_device $source_device' entry in $LAYOUT_FILE"
;;
esac
done
@@ -37,26 +77,25 @@ create_crypt() {
cryptsetup_options+=" $LUKS_CRYPTSETUP_OPTIONS"
(
- echo "Log \"Creating LUKS device $target_name on $source_device\""
+ echo "LogPrint \"Creating LUKS volume $mapping_name on $source_device\""
if [ -n "$keyfile" ] ; then
# Assign a temporary keyfile at this stage so that original keyfiles do not leak onto the rescue medium.
# The original keyfile will be restored from the backup and then re-assigned to the LUKS device in the
# 'finalize' stage.
# The scheme for generating a temporary keyfile path must be the same here and in the 'finalize' stage.
- keyfile="${TMPDIR:-/tmp}/LUKS-keyfile-$target_name"
+ keyfile="$TMP_DIR/LUKS-keyfile-$mapping_name"
dd bs=512 count=4 if=/dev/urandom of="$keyfile"
chmod u=rw,go=- "$keyfile"
-
echo "cryptsetup luksFormat --batch-mode $cryptsetup_options $source_device $keyfile"
- echo "cryptsetup luksOpen --key-file $keyfile $source_device $target_name"
+ echo "cryptsetup luksOpen --key-file $keyfile $source_device $mapping_name"
elif [ -n "$password" ] ; then
echo "echo \"$password\" | cryptsetup luksFormat --batch-mode $cryptsetup_options $source_device"
- echo "echo \"$password\" | cryptsetup luksOpen $source_device $target_name"
+ echo "echo \"$password\" | cryptsetup luksOpen $source_device $mapping_name"
else
- echo "LogPrint \"Please enter the password for LUKS device $target_name ($source_device):\""
+ echo "LogUserOutput \"Set the password for LUKS volume $mapping_name (for 'cryptsetup luksFormat' on $source_device):\""
echo "cryptsetup luksFormat --batch-mode $cryptsetup_options $source_device"
- echo "LogPrint \"Please re-enter the password for LUKS device $target_name ($source_device):\""
- echo "cryptsetup luksOpen $source_device $target_name"
+ echo "LogUserOutput \"Enter the password for LUKS volume $mapping_name (for 'cryptsetup luksOpen' on $source_device):\""
+ echo "cryptsetup luksOpen $source_device $mapping_name"
fi
echo ""
) >> "$LAYOUT_CODE"
@@ -64,38 +103,61 @@ create_crypt() {
# Function open_crypt() is meant to be used by the 'mountonly' workflow
open_crypt() {
+ # See the do_mount_device() function in lib/layout-functions.sh what "device type" means:
+ local device_type="$1"
+ if ! grep -q "^crypt $device_type " "$LAYOUT_FILE" ; then
+ LogPrintError "Skip opening LUKS volume $device_type (no 'crypt $device_type' entry in $LAYOUT_FILE)"
+ # FIXME: The return code is ignored in the do_mount_device() function in lib/layout-functions.sh:
+ return 1
+ fi
+
local crypt target_device source_device options
- read crypt target_device source_device options < <(grep "^crypt $1 " "$LAYOUT_FILE")
+ local mapping_name option key value
+ local cryptsetup_options="" keyfile="" password=""
- local target_name=${target_device#/dev/mapper/}
+ read crypt target_device source_device options < <( grep "^crypt $device_type " "$LAYOUT_FILE" )
+
+ if ! test -b "$source_device" ; then
+ LogPrintError "Skip opening LUKS volume $device_type on device '$source_device' that is no block device (see the 'crypt $device_type' entry in $LAYOUT_FILE)"
+ # FIXME: The return code is ignored in the do_mount_device() function in lib/layout-functions.sh:
+ return 1
+ fi
+
+ mapping_name=${target_device#/dev/mapper/}
+ if ! test $mapping_name ; then
+ LogPrintError "Skip opening LUKS volume $device_type on $source_device: No /dev/mapper/... mapping name (see the 'crypt $device_type' entry in $LAYOUT_FILE)"
+ # FIXME: The return code is ignored in the do_mount_device() function in lib/layout-functions.sh:
+ return 1
+ fi
- local cryptsetup_options="" keyfile="" password=""
- local option key value
for option in $options ; do
- key=${option%=*}
+ # $option is of the form keyword=value and
+ # we assume keyword has no '=' character but value could be anything that may have a '=' character
+ # so we split keyword=value at the leftmost '=' character so that
+ # e.g. keyword=foo=bar gets split into key="keyword" and value="foo=bar":
+ key=${option%%=*}
value=${option#*=}
-
case "$key" in
- keyfile)
- keyfile=$value
+ (keyfile)
+ test $value && keyfile=$value
;;
- password)
- password=$value
+ (password)
+ test $value && password=$value
;;
esac
done
(
- echo "Log \"Opening LUKS device $target_name on $source_device\""
+ echo "LogPrint \"Opening LUKS volume $mapping_name on $source_device\""
if [ -n "$keyfile" ] ; then
# During a 'mountonly' workflow, the original keyfile is supposed to be
# available at this point.
- echo "cryptsetup luksOpen --key-file $keyfile $source_device $target_name"
+ echo "cryptsetup luksOpen --key-file $keyfile $source_device $mapping_name"
elif [ -n "$password" ] ; then
- echo "echo \"$password\" | cryptsetup luksOpen $source_device $target_name"
+ echo "echo \"$password\" | cryptsetup luksOpen $source_device $mapping_name"
else
- echo "LogPrint \"Please enter the password for LUKS device $target_name ($source_device):\""
- echo "cryptsetup luksOpen $source_device $target_name"
+ echo "LogUserOutput \"Enter the password for LUKS volume $mapping_name (for 'cryptsetup luksOpen' on $source_device):\""
+ echo "cryptsetup luksOpen $source_device $mapping_name"
fi
echo ""
) >> "$LAYOUT_CODE"
diff --git a/usr/share/rear/layout/save/GNU/Linux/260_crypt_layout.sh b/usr/share/rear/layout/save/GNU/Linux/260_crypt_layout.sh
index c1e1cfd5..afeabf6a 100644
--- a/usr/share/rear/layout/save/GNU/Linux/260_crypt_layout.sh
+++ b/usr/share/rear/layout/save/GNU/Linux/260_crypt_layout.sh
@@ -9,6 +9,8 @@ Log "Saving Encrypted volumes."
REQUIRED_PROGS+=( cryptsetup dmsetup )
COPY_AS_IS+=( /usr/share/cracklib/\* /etc/security/pwquality.conf )
+local invalid_cryptsetup_option_value="no"
+
while read target_name junk ; do
# find the target device we're mapping
if ! [ -e /dev/mapper/$target_name ] ; then
@@ -30,29 +32,96 @@ while read target_name junk ; do
source_device="$(get_device_name ${slave##*/})"
done
- if ! cryptsetup isLuks $source_device >/dev/null 2>&1; then
+ if ! blkid -p -o export $source_device >$TMP_DIR/blkid.output ; then
+ LogPrintError "Error: Cannot get attributes for $target_name ('blkid -p -o export $source_device' failed)"
continue
fi
- # gather crypt information
- cipher=$(cryptsetup luksDump $source_device | grep "Cipher name" | sed -r 's/^.+:\s*(.+)$/\1/')
- mode=$(cryptsetup luksDump $source_device | grep "Cipher mode" | cut -d: -f2- | awk '{printf("%s",$1)};')
- key_size=$(cryptsetup luksDump $source_device | grep "MK bits" | sed -r 's/^.+:\s*(.+)$/\1/')
- hash=$(cryptsetup luksDump $source_device | grep "Hash spec" | sed -r 's/^.+:\s*(.+)$/\1/')
- uuid=$(cryptsetup luksDump $source_device | grep "UUID" | sed -r 's/^.+:\s*(.+)$/\1/')
- keyfile_option=$([ -f /etc/crypttab ] && awk '$1 == "'"$target_name"'" && $3 != "none" && $3 != "-" && $3 != "" { print "keyfile=" $3; }' /etc/crypttab)
+ if ! grep -q "TYPE=crypto_LUKS" $TMP_DIR/blkid.output ; then
+ Log "Skipping $target_name (no 'TYPE=crypto_LUKS' in 'blkid -p -o export $source_device' output)"
+ continue
+ fi
- # LUKS version 2 is not yet suppported, see https://github.com/rear/rear/issues/2204
- # When LUKS version 2 is used the above code fails at least to determine the hash value
- # so we use an empty hash value as a simple test if gathering crypt information was successful:
- test "$hash" || Error "No hash value for LUKS device '$target_name' at '$source_device' (only LUKS version 1 is supported)"
+ # Detect LUKS version:
+ # Remove all non-digits in particular to avoid leading or trailing spaces in the version string
+ # cf. "Beware of the emptiness" in https://github.com/rear/rear/wiki/Coding-Style
+ # that could happen if the blkid output contains "VERSION = 2" so that 'cut -d= -f2' results " 2".
+ version=$( grep "VERSION" $TMP_DIR/blkid.output | cut -d= -f2 | tr -c -d '[:digit:]' )
+ if ! test "$version" = "1" -o "$version" = "2" ; then
+ LogPrintError "Error: Unsupported LUKS version for $target_name ('blkid -p -o export $source_device' shows 'VERSION=$version')"
+ continue
+ fi
+ luks_type=luks$version
- echo "crypt /dev/mapper/$target_name $source_device cipher=$cipher-$mode key_size=$key_size hash=$hash uuid=$uuid $keyfile_option" >> $DISKLAYOUT_FILE
-done < <( dmsetup ls --target crypt )
+ # Gather crypt information:
+ if ! cryptsetup luksDump $source_device >$TMP_DIR/cryptsetup.luksDump ; then
+ LogPrintError "Error: Cannot get LUKS$version values for $target_name ('cryptsetup luksDump $source_device' failed)"
+ continue
+ fi
+ uuid=$( grep "UUID" $TMP_DIR/cryptsetup.luksDump | sed -r 's/^.+:\s*(.+)$/\1/' )
+ keyfile_option=$( [ -f /etc/crypttab ] && awk '$1 == "'"$target_name"'" && $3 != "none" && $3 != "-" && $3 != "" { print "keyfile=" $3; }' /etc/crypttab )
+ if test $luks_type = "luks1" ; then
+ cipher_name=$( grep "Cipher name" $TMP_DIR/cryptsetup.luksDump | sed -r 's/^.+:\s*(.+)$/\1/' )
+ cipher_mode=$( grep "Cipher mode" $TMP_DIR/cryptsetup.luksDump | cut -d: -f2- | awk '{printf("%s",$1)};' )
+ cipher=$cipher_name-$cipher_mode
+ key_size=$( grep "MK bits" $TMP_DIR/cryptsetup.luksDump | sed -r 's/^.+:\s*(.+)$/\1/' )
+ hash=$( grep "Hash spec" $TMP_DIR/cryptsetup.luksDump | sed -r 's/^.+:\s*(.+)$/\1/' )
+ elif test $luks_type = "luks2" ; then
+ cipher=$( grep "cipher:" $TMP_DIR/cryptsetup.luksDump | sed -r 's/^.+:\s*(.+)$/\1/' )
+ # More than one keyslot may be defined - use key_size from the first slot.
+ # Depending on the version the "cryptsetup luksDump" command outputs the key_size value
+ # as a line like
+ # Key: 512 bits
+ # and/or as a line like
+ # Cipher key: 512 bits
+ # cf. https://github.com/rear/rear/pull/2504#issuecomment-718729198 and subsequent comments
+ # so we grep for both lines but use only the first match from the first slot:
+ key_size=$( egrep -m 1 "Key:|Cipher key:" $TMP_DIR/cryptsetup.luksDump | sed -r 's/^.+:\s*(.+) bits$/\1/' )
+ hash=$( grep "Hash" $TMP_DIR/cryptsetup.luksDump | sed -r 's/^.+:\s*(.+)$/\1/' )
+ fi
-# cryptsetup is required in the recovery system if disklayout.conf contains at least one 'crypt' entry
-# see the create_crypt function in layout/prepare/GNU/Linux/160_include_luks_code.sh
-# what program calls are written to diskrestore.sh
-# cf. https://github.com/rear/rear/issues/1963
-grep -q '^crypt ' $DISKLAYOUT_FILE && REQUIRED_PROGS+=( cryptsetup ) || true
+ # Basic checks that the cipher key_size hash uuid values exist
+ # cf. https://github.com/rear/rear/pull/2504#issuecomment-718729198
+ # because some values are needed during "rear recover"
+ # to set cryptsetup options in layout/prepare/GNU/Linux/160_include_luks_code.sh
+ # and it seems cryptsetup fails when options with empty values are specified
+ # cf. https://github.com/rear/rear/pull/2504#issuecomment-719479724
+ # For example a LUKS1 crypt entry in disklayout.conf looks like
+ # crypt /dev/mapper/luks1test /dev/sda7 type=luks1 cipher=aes-xts-plain64 key_size=256 hash=sha256 uuid=1b4198c9-d9b0-4c57-b9a3-3433e391e706
+ # and a LUKS1 crypt entry in disklayout.conf looks like
+ # crypt /dev/mapper/luks2test /dev/sda8 type=luks2 cipher=aes-xts-plain64 key_size=256 hash=sha256 uuid=3e874a28-7415-4f8c-9757-b3f28a96c4d2
+ # Only the keyfile_option value is optional and the luks_type value is already tested above.
+ # Using plain test to ensure a value is a single non empty and non blank word
+ # without quoting because test " " would return zero exit code
+ # cf. "Beware of the emptiness" in https://github.com/rear/rear/wiki/Coding-Style
+ # Do not error out instantly here but only report errors here so the user can see all messages
+ # and actually error out at the end of this script if there was one actually invalid value:
+ if ! test $cipher ; then
+ LogPrint "No 'cipher' value for LUKS$version volume $target_name in $source_device"
+ fi
+ if test $key_size ; then
+ if ! is_positive_integer $key_size ; then
+ LogPrintError "Error: 'key_size=$key_size' is no positive integer for LUKS$version volume $target_name in $source_device"
+ invalid_cryptsetup_option_value="yes"
+ fi
+ else
+ LogPrint "No 'key_size' value for LUKS$version volume $target_name in $source_device"
+ fi
+ if ! test $hash ; then
+ LogPrint "No 'hash' value for LUKS$version volume $target_name in $source_device"
+ fi
+ if ! test $uuid ; then
+ # Report a missig uuid value as an error to have the user informed
+ # but do not error out here because things can be fixed manually during "rear recover"
+ # cf. https://github.com/rear/rear/pull/2506#issuecomment-721757810
+ # and https://github.com/rear/rear/pull/2506#issuecomment-722315498
+ # and https://github.com/rear/rear/issues/2509
+ LogPrintError "Error: No 'uuid' value for LUKS$version volume $target_name in $source_device (mounting it or booting the recreated system may fail)"
+ fi
+
+ echo "crypt /dev/mapper/$target_name $source_device type=$luks_type cipher=$cipher key_size=$key_size hash=$hash uuid=$uuid $keyfile_option" >> $DISKLAYOUT_FILE
+
+done < <( dmsetup ls --target crypt )
+# Let this script return successfully when invalid_cryptsetup_option_value is not true:
+is_true $invalid_cryptsetup_option_value && Error "Invalid or empty LUKS cryptsetup option value(s) in $DISKLAYOUT_FILE" || true