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if [ "${0#/usr/share/initramfs-tools/hooks/}" != "$0" ] ||
[ "${0#/etc/initramfs-tools/hooks/}" != "$0" ]; then
# called from an initramfs-tools hook script
TABFILE="$DESTDIR/cryptroot/crypttab"
elif [ "${0#/scripts/}" != "$0" ]; then
# called at initramfs stage from a boot script
TABFILE="/cryptroot/crypttab"
else
TABFILE="${TABFILE-/etc/crypttab}"
fi
export DM_DEFAULT_NAME_MANGLING_MODE=hex # for dmsetup(8)
export CRYPTR_LOCAL_BLOCK="/run/cryptroot.local-block"
export CRYPTR_CNT_FILE="/run/cryptroot.initrd.cnt"
# Logging helpers. Send the argument list to plymouth(1), or fold it
# and print it to the standard error.
cryptsetup_message() {
local IFS=' '
if [ "${0#/scripts/}" != "$0" ] && [ -x /bin/plymouth ] && plymouth --ping; then
plymouth message --text="cryptsetup: $*"
elif [ ${#*} -lt 70 ]; then
echo "cryptsetup: $*" >&2
else
# use busybox's fold(1) and sed(1) at initramfs stage
echo "cryptsetup: $*" | fold -s | sed '1! s/^/ /' >&2
fi
return 0
}
# crypttab_parse_options([--export], [--quiet], [--missing-path={ignore|warn|fail}])
# Parse $_CRYPTTAB_OPTIONS, a comma-separated option string from the
# crypttab(5) 4th column, and sets corresponding variables
# CRYPTTAB_OPTION_<option>=<value> (which are added to the environment
# if --export is set). If --path-exists isn't set to "ignore" (the
# default), then options taking a file name, such as header=<path>,
# need to point to an existing path, otherwise a warning is printed;
# and an error is raised if the value is set to "fail".
# For error and warning messages, CRYPTTAB_NAME, (resp. CRYPTTAB_KEY)
# should be set to the (unmangled) mapped device name (resp. key
# file).
# Return 1 on parsing error, 0 otherwise (incl. if unknown options
# were encountered).
crypttab_parse_options() {
local quiet="n" export="n" missing_path="ignore"
while [ $# -gt 0 ]; do
case "$1" in
--quiet) quiet="y";;
--export) export="y";;
--missing-path=*) missing_path="${1#--missing-path=}";;
*) cryptsetup_message "WARNING: crypttab_parse_options(): unknown option $1"
esac
shift
done
local IFS=',' x OPTION VALUE
unset -v CRYPTTAB_OPTION_cipher \
CRYPTTAB_OPTION_size \
CRYPTTAB_OPTION_sector_size \
CRYPTTAB_OPTION_hash \
CRYPTTAB_OPTION_offset \
CRYPTTAB_OPTION_skip \
CRYPTTAB_OPTION_verify \
CRYPTTAB_OPTION_readonly \
CRYPTTAB_OPTION_discard \
CRYPTTAB_OPTION_plain \
CRYPTTAB_OPTION_luks \
CRYPTTAB_OPTION_tcrypt \
CRYPTTAB_OPTION_veracrypt \
CRYPTTAB_OPTION_swap \
CRYPTTAB_OPTION_tmp \
CRYPTTAB_OPTION_check \
CRYPTTAB_OPTION_checkargs \
CRYPTTAB_OPTION_tries \
CRYPTTAB_OPTION_initramfs \
CRYPTTAB_OPTION_noearly \
CRYPTTAB_OPTION_noauto \
CRYPTTAB_OPTION_loud \
CRYPTTAB_OPTION_quiet \
CRYPTTAB_OPTION_keyscript \
CRYPTTAB_OPTION_keyslot \
CRYPTTAB_OPTION_header \
CRYPTTAB_OPTION_tcrypthidden
# use $_CRYPTTAB_OPTIONS not $CRYPTTAB_OPTIONS as options values may
# contain '\054' which is decoded to ',' in the latter
for x in $_CRYPTTAB_OPTIONS; do
OPTION="${x%%=*}"
VALUE="${x#*=}"
if [ "$x" = "$OPTION" ]; then
unset -v VALUE
else
VALUE="$(printf '%b' "$VALUE")"
fi
if ! crypttab_validate_option; then
if [ "$quiet" = "n" ]; then
cryptsetup_message "ERROR: $CRYPTTAB_NAME: invalid value for '${x%%=*}' option, skipping"
fi
return 1
elif [ -z "${OPTION+x}" ]; then
continue
fi
if [ "$export" = "y" ]; then
export "CRYPTTAB_OPTION_$OPTION"="${VALUE-yes}"
else
eval "CRYPTTAB_OPTION_$OPTION"='${VALUE-yes}'
fi
done
IFS=" "
if [ "$quiet" = "n" ] &&
[ -z "${CRYPTTAB_OPTION_luks+x}" ] && [ -n "${CRYPTTAB_OPTION_header+x}" ]; then
cryptsetup_message "WARNING: Option 'luks' missing in crypttab for target $CRYPTTAB_NAME." \
"Headers are only supported for LUKS devices."
fi
if [ -z "${CRYPTTAB_OPTION_luks+x}" ] && [ -z "${CRYPTTAB_OPTION_tcrypt+x}" ]; then
# the compiled-in default for these are subject to change
options='cipher size'
if [ -n "${CRYPTTAB_OPTION_keyscript+x}" ] || [ "$CRYPTTAB_KEY" = "none" ]; then
options="$options hash" # --hash is being ignored in plain mode with keyfile specified
fi
for o in $options; do
if [ "$quiet" = "n" ] && eval [ -z "\${CRYPTTAB_OPTION_$o+x}" ]; then
cryptsetup_message "WARNING: Option '$o' missing in crypttab for plain dm-crypt" \
"mapping $CRYPTTAB_NAME. Please read /usr/share/doc/cryptsetup-initramfs/README.initramfs.gz and" \
"add the correct '$o' option to your crypttab(5)."
fi
done
fi
}
# crypttab_validate_option()
# Validate $OPTION=$VALUE (or flag $OPTION if VALUE is unset). return
# 1 on error, unsets OPTION for unknown or useless options.
crypttab_validate_option() {
# option aliases
case "$OPTION" in
read-only) OPTION="readonly";;
key-slot) OPTION="keyslot";;
tcrypt-hidden) OPTION="tcrypthidden";;
tcrypt-veracrypt) OPTION="veracrypt";;
esac
# sanitize the option name so CRYPTTAB_OPTION_$OPTION is a valid variable name
local o="$OPTION"
case "$o" in
keyfile-offset) OPTION="keyfile_offset";;
keyfile-size) OPTION="keyfile_size";;
sector-size) OPTION="sector_size";;
esac
case "$o" in
# value must be a non-empty string
cipher|hash)
[ -n "${VALUE:+x}" ] || return 1
;;
# value must be a non-empty string, and an existing path if --missing-path is set
header)
[ -n "${VALUE:+x}" ] || return 1
if [ "$missing_path" != "ignore" ]; then
if [ ! -e "$VALUE" ]; then
cryptsetup_message "WARNING: $CRYPTTAB_NAME: $VALUE does not exist";
[ "$missing_path" = "warn" ] || return 1
fi
fi
;;
# numeric options >0
size|keyfile-size|sector-size)
if ! printf '%s' "${VALUE-}" | grep -Exq "0*[1-9][0-9]*"; then
return 1
fi
;;
# numeric options >=0
offset|skip|tries|keyslot|keyfile-offset)
if ! printf '%s' "${VALUE-}" | grep -Exq "[0-9]+"; then
return 1
fi
;;
tmp)
if [ -z "${VALUE+x}" ]; then
VALUE="ext4" # 'tmp flag'
elif [ -z "$VALUE" ]; then
return 1
fi
;;
check)
if [ -z "${VALUE+x}" ]; then
if [ -n "${CRYPTDISKS_CHECK-}" ]; then
VALUE="$CRYPTDISKS_CHECK"
else
unset -v OPTION
return 0
fi
fi
if [ -x "/lib/cryptsetup/checks/$VALUE" ] && [ -f "/lib/cryptsetup/checks/$VALUE" ]; then
VALUE="/lib/cryptsetup/checks/$VALUE"
elif [ ! -x "$VALUE" ] || [ ! -f "$VALUE" ]; then
return 1
fi
;;
checkargs)
[ -n "${VALUE+x}" ] || return 1 # must have a value (possibly empty)
;;
keyscript)
[ -n "${VALUE:+x}" ] || return 1 # must have a value
if [ "${VALUE#/}" = "$VALUE" ]; then
VALUE="/lib/cryptsetup/scripts/$VALUE"
fi
if [ ! -x "$VALUE" ] || [ ! -f "$VALUE" ]; then
return 1
fi
;;
# and now the flags
verify) ;;
loud) ;;
quiet) ;;
initramfs) ;;
noearly) ;;
noauto) ;;
readonly) ;;
discard) ;;
plain) ;;
luks) ;;
swap) ;;
tcrypt) ;;
veracrypt) ;;
tcrypthidden) ;;
*)
if [ "${quiet:-n}" = "n" ]; then
cryptsetup_message "WARNING: $CRYPTTAB_NAME: ignoring unknown option '$o'";
fi
unset -v OPTION
;;
esac
}
# crypttab_resolve_source()
# Resolve the CRYPTTAB_SOURCE variable, containing value of the second
# field of a crypttab(5)-like file.
# On error (non-existing source), CRYPTTAB_SOURCE is not changed and 1
# is returned.
crypttab_resolve_source() {
# return immediately if source is a regular file
[ ! -f "$CRYPTTAB_SOURCE" ] || return 0
# otherwise resolve the block device specification
local dev="$CRYPTTAB_SOURCE"
dev="$(resolve_device_spec "$dev")" && CRYPTTAB_SOURCE="$dev" || return 1
}
# run_keyscript($keyscriptarg, $tried_count)
# exec()'ute `$CRYPTTAB_OPTION_keyscript $keyscriptarg`.
# If $CRYPTTAB_OPTION_keyscript is unset or null and $keyscriptarg is
# "none" (meaning the passphrase is to be read interactively from the
# console), use `/lib/cryptsetup/askpass` as keyscript with a suitable
# prompt message.
# Since the shell process is replaced with the $CRYPTTAB_OPTION_keyscript
# program, run_keyscript() must be used on the left-hand side of a
# pipe, or similar.
run_keyscript() {
local keyscriptarg="$1" CRYPTTAB_TRIED="$2" keyscript;
export CRYPTTAB_NAME CRYPTTAB_SOURCE CRYPTTAB_OPTIONS
export CRYPTTAB_TRIED
if [ -n "${CRYPTTAB_OPTION_keyscript+x}" ] && \
[ "$CRYPTTAB_OPTION_keyscript" != "/lib/cryptsetup/askpass" ]; then
# 'keyscript' option is present: export its argument as
# $CRYPTTAB_KEY
export CRYPTTAB_KEY="$keyscriptarg"
keyscript="$CRYPTTAB_OPTION_keyscript"
elif [ "$keyscriptarg" = none ]; then
# don't export the prompt message as CRYPTTAB_KEY
keyscript="/lib/cryptsetup/askpass"
keyscriptarg="Please unlock disk $CRYPTTAB_NAME: "
fi
exec "$keyscript" "$keyscriptarg"
}
# get_crypt_type()
# Set CRYPTTAB_TYPE to the mapping type, depending on its
# $CRYPTTAB_OPTION_<option> values
get_crypt_type() {
if [ "${CRYPTTAB_OPTION_tcrypt-}" = "yes" ]; then
CRYPTTAB_TYPE="tcrypt"
elif [ "${CRYPTTAB_OPTION_plain-}" = "yes" ]; then
CRYPTTAB_TYPE="plain"
elif [ "${CRYPTTAB_OPTION_luks-}" = "yes" ] ||
/sbin/cryptsetup isLuks -- "${CRYPTTAB_OPTION_header-$CRYPTTAB_SOURCE}"; then
CRYPTTAB_TYPE="luks"
else
# assume plain dm-crypt device by default
CRYPTTAB_TYPE="plain"
fi
}
# unlock_mapping([$keyfile])
# Run cryptsetup(8) with suitable options and arguments to unlock
# $CRYPTTAB_SOURCE and setup dm-crypt managed device-mapper mapping
# $CRYPTTAB_NAME.
unlock_mapping() {
local keyfile="${1:--}"
if [ "$CRYPTTAB_TYPE" = "luks" ] || [ "$CRYPTTAB_TYPE" = "tcrypt" ]; then
# ignored for LUKS and TCRYPT devices
unset -v CRYPTTAB_OPTION_cipher \
CRYPTTAB_OPTION_size \
CRYPTTAB_OPTION_hash \
CRYPTTAB_OPTION_offset \
CRYPTTAB_OPTION_skip
fi
if [ "$CRYPTTAB_TYPE" = "plain" ] || [ "$CRYPTTAB_TYPE" = "tcrypt" ]; then
unset -v CRYPTTAB_OPTION_keyfile_size
fi
if [ "$CRYPTTAB_TYPE" = "tcrypt" ]; then
# ignored for TCRYPT devices
unset -v CRYPTTAB_OPTION_keyfile_offset
else
# ignored for non-TCRYPT devices
unset -v CRYPTTAB_OPTION_veracrypt CRYPTTAB_OPTION_tcrypthidden
fi
if [ "$CRYPTTAB_TYPE" != "luks" ]; then
# ignored for non-LUKS devices
unset -v CRYPTTAB_OPTION_keyslot
fi
/sbin/cryptsetup -T1 \
${CRYPTTAB_OPTION_header:+--header="$CRYPTTAB_OPTION_header"} \
${CRYPTTAB_OPTION_cipher:+--cipher="$CRYPTTAB_OPTION_cipher"} \
${CRYPTTAB_OPTION_size:+--key-size="$CRYPTTAB_OPTION_size"} \
${CRYPTTAB_OPTION_sector_size:+--sector-size="$CRYPTTAB_OPTION_sector_size"} \
${CRYPTTAB_OPTION_hash:+--hash="$CRYPTTAB_OPTION_hash"} \
${CRYPTTAB_OPTION_offset:+--offset="$CRYPTTAB_OPTION_offset"} \
${CRYPTTAB_OPTION_skip:+--skip="$CRYPTTAB_OPTION_skip"} \
${CRYPTTAB_OPTION_verify:+--verify-passphrase} \
${CRYPTTAB_OPTION_readonly:+--readonly} \
${CRYPTTAB_OPTION_discard:+--allow-discards} \
${CRYPTTAB_OPTION_veracrypt:+--veracrypt} \
${CRYPTTAB_OPTION_keyslot:+--key-slot="$CRYPTTAB_OPTION_keyslot"} \
${CRYPTTAB_OPTION_tcrypthidden:+--tcrypt-hidden} \
${CRYPTTAB_OPTION_keyfile_size:+--keyfile-size="$CRYPTTAB_OPTION_keyfile_size"} \
${CRYPTTAB_OPTION_keyfile_offset:+--keyfile-offset="$CRYPTTAB_OPTION_keyfile_offset"} \
--type="$CRYPTTAB_TYPE" --key-file="$keyfile" \
open -- "$CRYPTTAB_SOURCE" "$CRYPTTAB_NAME"
}
# crypttab_key_check()
# Sanity checks for keyfile $CRYPTTAB_KEY. CRYPTTAB_NAME and
# CRYPTTAB_OPTION_<option> must be set appropriately.
crypttab_key_check() {
if [ ! -f "$CRYPTTAB_KEY" ] && [ ! -b "$CRYPTTAB_KEY" ] && [ ! -c "$CRYPTTAB_KEY" ] ; then
cryptsetup_message "WARNING: $CRYPTTAB_NAME: keyfile '$CRYPTTAB_KEY' not found"
return 0
fi
if [ "$CRYPTTAB_KEY" = "/dev/random" ] || [ "$CRYPTTAB_KEY" = "/dev/urandom" ]; then
if [ -n "${CRYPTTAB_OPTION_luks+x}" ] || [ -n "${CRYPTTAB_OPTION_tcrypt+x}" ]; then
cryptsetup_message "WARNING: $CRYPTTAB_NAME: has random data as key"
return 1
else
return 0
fi
fi
local mode="$(stat -L -c"%04a" -- "$CRYPTTAB_KEY")"
if [ $(stat -L -c"%u" -- "$CRYPTTAB_KEY") -ne 0 ] || [ "${mode%00}" = "$mode" ]; then
cryptsetup_message "WARNING: $CRYPTTAB_NAME: key file $CRYPTTAB_KEY has" \
"insecure ownership, see /usr/share/doc/cryptsetup/README.Debian.gz."
fi
}
# resolve_device_spec($spec)
# Resolve LABEL=<label>, UUID=<uuid>, PARTUUID=<partuuid> and
# PARTLABEL=<partlabel> to a block special device. If $spec is
# already a (link to a block special device) then it is echoed as is.
# Return 1 if $spec doesn't correspond to a block special device.
resolve_device_spec() {
local spec="$1"
case "$spec" in
UUID=*|LABEL=*|PARTUUID=*|PARTLABEL=*)
# don't use /dev/disk/by-label/... to avoid gessing udev mangling
spec="$(blkid -l -t "$spec" -o device)" || spec=
;;
esac
[ -b "$spec" ] && printf '%s\n' "$spec" || return 1
}
# dm_blkdevname($name)
# Print the mapped device name, or return 1 if the the device doesn't exist.
dm_blkdevname() {
local name="$1" dev
# /dev/mapper/$name isn't reliable due to udev mangling
if dev="$(dmsetup info -c --noheadings -o blkdevname -- "$name" 2>/dev/null)" &&
[ -n "$dev" ] && [ -b "/dev/$dev" ]; then
echo "/dev/$dev"
return 0
else
return 1
fi
}
# crypttab_find_entry([--quiet], $target)
# Search in the crypttab(5) for the given $target, and sets the
# variables CRYPTTAB_NAME, CRYPTTAB_SOURCE, CRYPTTAB_KEY and
# CRYPTTAB_OPTIONS accordingly. (In addition _CRYPTTAB_NAME,
# _CRYPTTAB_SOURCE, _CRYPTTAB_KEY and _CRYPTTAB_OPTIONS are set to the
# unmangled values before decoding the escape sequence.) If there are
# duplicates then only the first match is considered.
# Return 0 if a match is found, and 1 otherwise.
crypttab_find_entry() {
local target="$1" quiet="n" IFS
if [ "$target" = "--quiet" ] && [ $# -eq 2 ]; then
quiet="y"
target="$2"
fi
if [ -f "$TABFILE" ]; then
while IFS=" " read -r _CRYPTTAB_NAME _CRYPTTAB_SOURCE _CRYPTTAB_KEY _CRYPTTAB_OPTIONS; do
if [ "${_CRYPTTAB_NAME#\#}" != "$_CRYPTTAB_NAME" ] || [ -z "$_CRYPTTAB_NAME" ]; then
# ignore comments and empty lines
continue
fi
# unmangle names
CRYPTTAB_NAME="$(printf '%b' "$_CRYPTTAB_NAME")"
if [ -z "$_CRYPTTAB_SOURCE" ] || [ -z "$_CRYPTTAB_KEY" ] || [ -z "$_CRYPTTAB_OPTIONS" ]; then
cryptsetup_message "WARNING: '$CRYPTTAB_NAME' is missing some arguments, see crypttab(5)"
continue
elif [ "$CRYPTTAB_NAME" = "$target" ]; then
CRYPTTAB_SOURCE="$( printf '%b' "$_CRYPTTAB_SOURCE" )"
CRYPTTAB_KEY="$( printf '%b' "$_CRYPTTAB_KEY" )"
CRYPTTAB_OPTIONS="$(printf '%b' "$_CRYPTTAB_OPTIONS")"
return 0
fi
done <"$TABFILE"
fi
if [ "$quiet" = "n" ]; then
cryptsetup_message "WARNING: target '$target' not found in $TABFILE"
fi
return 1
}
# crypttab_foreach_entry($callback)
# Iterate through the crypttab(5) and run the given $callback for each
# entry found. Variables CRYPTTAB_NAME, CRYPTTAB_SOURCE, CRYPTTAB_KEY
# and CRYPTTAB_OPTIONS are set accordingly and available to the
# $callback. (In addition _CRYPTTAB_NAME, _CRYPTTAB_SOURCE,
# _CRYPTTAB_KEY and _CRYPTTAB_OPTIONS are set to the unmangled values
# before decoding the escape sequence.)
# Return 0 if a match is found, and 1 otherwise.
crypttab_foreach_entry() {
local callback="$1" IFS
local _CRYPTTAB_NAME _CRYPTTAB_SOURCE _CRYPTTAB_KEY _CRYPTTAB_OPTIONS \
CRYPTTAB_NAME CRYPTTAB_SOURCE CRYPTTAB_KEY CRYPTTAB_OPTIONS
[ -f "$TABFILE" ] || return
while IFS=" " read -r _CRYPTTAB_NAME _CRYPTTAB_SOURCE _CRYPTTAB_KEY _CRYPTTAB_OPTIONS <&9; do
if [ "${_CRYPTTAB_NAME#\#}" != "$_CRYPTTAB_NAME" ] || [ -z "$_CRYPTTAB_NAME" ]; then
# ignore comments and empty lines
continue
fi
# unmangle names
CRYPTTAB_NAME="$( printf '%b' "$_CRYPTTAB_NAME" )"
CRYPTTAB_SOURCE="$( printf '%b' "$_CRYPTTAB_SOURCE" )"
CRYPTTAB_KEY="$( printf '%b' "$_CRYPTTAB_KEY" )"
CRYPTTAB_OPTIONS="$(printf '%b' "$_CRYPTTAB_OPTIONS")"
if [ -z "$CRYPTTAB_SOURCE" ] || [ -z "$CRYPTTAB_KEY" ] || [ -z "$CRYPTTAB_OPTIONS" ]; then
cryptsetup_message "WARNING: '$CRYPTTAB_NAME' is missing some arguments, see crypttab(5)"
continue
fi
"$callback" 9<&-
done 9<"$TABFILE"
}
# vim: set filetype=sh :
