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PATH="/usr/sbin:/usr/bin:/sbin:/bin" TABFILE=${TABFILE-"/etc/crypttab"} CRYPTDISKS_ENABLE="Yes" #set -x # Sanity check #1 [ -x /sbin/cryptsetup ] || exit 0 . /lib/lsb/init-functions if [ -r /etc/default/cryptdisks ]; then . /etc/default/cryptdisks fi # Sanity check #2 [ -f "$TABFILE" ] || exit 0 MOUNT="$CRYPTDISKS_MOUNT" # Parses the option field from the crypttab file parse_opts () { local opts opt IFS PARAM VALUE # Strip comments - https://bugs.launchpad.net/bugs/185380 opts=$(echo -n $1 | sed 's/ *#.*//') PARAMS="" LUKSPARAMS="" CRYPTHEADER="" TCRYPTPARAMS="" PLAINPARAMS="" CHECK="" CHECKARGS="" PRECHECK="" TRIES="3" TMPFS="" MAKESWAP="" USELUKS="" USETCRYPT="" KEYSCRIPT="" IGNORE="" CRYPTTAB_OPTIONS="" LOUD="$DEFAULT_LOUD" # Parse the options field, convert to cryptsetup parameters # and construct the command line IFS=',' for opt in $opts; do PARAM=$(echo "$opt" | sed 's/=.*//') VALUE=$(echo "$opt" | sed '/=/!d;s/^.*=//') case "$PARAM" in readonly) PARAMS="$PARAMS -r" ;; cipher) if [ -z "$VALUE" ]; then log_warning_msg "$dst: no value for cipher option, skipping" return 1 fi PLAINPARAMS="$PLAINPARAMS -c $VALUE" ;; size) if [ -z "$VALUE" ] || echo "$VALUE" | grep -q "^[[:digit:]]\+$" && [ "$VALUE" -gt 0 ]; then PLAINPARAMS="$PLAINPARAMS -s $VALUE" else log_warning_msg "$dst: option size used with an incorrect argument, skipping" return 1 fi ;; hash) if [ -z "$VALUE" ]; then log_warning_msg "$dst: no value for hash option, skipping" return 1 fi PLAINPARAMS="$PLAINPARAMS -h $VALUE" ;; offset) if [ -z "$VALUE" ]; then log_warning_msg "$dst: no value for offset option, skipping" return 1 fi PLAINPARAMS="$PLAINPARAMS -o $VALUE" ;; skip) if [ -z "$VALUE" ]; then log_warning_msg "$dst: no value for skip option, skipping" return 1 fi PLAINPARAMS="$PLAINPARAMS -p $VALUE" ;; verify) PARAMS="$PARAMS -y" ;; check) if [ -z "$VALUE" ]; then VALUE="$CRYPTDISKS_CHECK" fi if [ -x "$VALUE" ]; then CHECK="$VALUE" elif [ -x "/lib/cryptsetup/checks/$VALUE" ]; then CHECK="/lib/cryptsetup/checks/$VALUE" else log_warning_msg "check $VALUE is not an executable script, skipping" return 1 fi ;; checkargs) if [ -n "$VALUE" ]; then CHECKARGS="$VALUE" fi ;; precheck) if [ -z "$VALUE" ]; then VALUE="$CRYPTDISKS_PRECHECK" fi if [ -x "$VALUE" ]; then PRECHECK="$VALUE" elif [ -x "/lib/cryptsetup/checks/$VALUE" ]; then PRECHECK="/lib/cryptsetup/checks/$VALUE" else log_warning_msg "precheck $VALUE is not an executable script, skipping" return 1 fi ;; tries) if echo "$VALUE" | grep -q "^[[:digit:]]\+$" && [ "$VALUE" -ge 0 ]; then TRIES="$VALUE" else log_warning_msg "$dst: option tries used with an incorrect argument - forced to $TRIES" fi ;; discard) PARAMS="$PARAMS --allow-discards" ;; swap) MAKESWAP="yes" ;; tmp) if [ -z "$VALUE" ]; then TMPFS="ext4" else TMPFS="$VALUE" fi ;; luks) USELUKS="yes" ;; header) if [ -z "$VALUE" ]; then log_warning_msg "$dst: no value for header option, skipping" return 1 fi LUKSPARAMS="$LUKSPARAMS --header=$VALUE" CRYPTHEADER="$VALUE" ;; tcrypt) USETCRYPT="yes" ;; noearly) if [ "$INITSTATE" = "early" ]; then IGNORE="yes" fi ;; noauto) if [ "$INITSTATE" != "manual" ]; then IGNORE="yes" fi ;; loud) LOUD="yes" ;; quiet) LOUD="" ;; keyscript) if [ -n "$KEYSCRIPT" ]; then log_warning_msg "$dst: multiple key decryption options are not allowed together, skipping" return 1 elif [ -z "$VALUE" ]; then log_warning_msg "$dst: no value for keyscript option, skipping" return 1 elif [ -x "$VALUE" ]; then KEYSCRIPT="$VALUE" elif [ -x "/lib/cryptsetup/scripts/$VALUE" ]; then KEYSCRIPT="/lib/cryptsetup/scripts/$VALUE" elif type "$VALUE" >/dev/null 2>&1; then KEYSCRIPT="$VALUE" else log_warning_msg "script $VALUE is not an executable script, skipping" return 1 fi ;; keyslot) if [ -z "$VALUE" ]; then log_warning_msg "$dst: no value for keyslot option, skipping" return 1 fi LUKSPARAMS="$LUKSPARAMS --key-slot $VALUE" ;; tcrypthidden) TCRYPTPARAMS="$TCRYPTPARAMS --tcrypt-hidden" ;; veracrypt) TCRYPTPARAMS="$TCRYPTPARAMS --veracrypt" ;; esac CRYPTTAB_OPTIONS="$CRYPTTAB_OPTIONS $PARAM" [ -z "$VALUE" ] && VALUE="yes" eval export CRYPTTAB_OPTION_$PARAM="\"$VALUE\"" done export CRYPTTAB_OPTIONS return 0 } # Sanity check for keys check_key () { local GMODE OMODE OWNER GROUP # If the keyscript option is set, the "key" is just an argument to # the keyscript and not necessarily a file if [ -n "$KEYSCRIPT" ]; then return 0 fi if [ -z "$key" ] || [ "$key" = "none" ]; then key="" return 0 fi if [ ! -e "$key" ]; then log_warning_msg "$dst: keyfile not found" return 1 fi # LUKS requires a persistent key, /dev/*random is not supported if [ "$USELUKS" = "yes" ] && [ "$key" != "${key%random}" ]; then log_warning_msg "$dst: LUKS does not work with random data as key" return 1 fi # TCRYPT requires a persistent key, /dev/*random is not supported if [ "$TCRYPT" = "yes" ] && [ "$key" != "${key%random}" ]; then log_warning_msg "$dst: TCRYPT does not work with random data as key" return 1 fi # Check ownership of $key OWNER="$(/bin/ls -l "$(readlink -f $key)" | sed 's/^.\{10\}[+\.]\?.[^[:space:]]* \([^[:space:]]*\).*/\1/')" if [ "$OWNER" != "root" ]; then log_warning_msg "$dst: INSECURE OWNER FOR $key, see /usr/share/doc/cryptsetup/README.Debian." fi # If key is random, we're done if [ "$key" != "${key%random}" ]; then return 0 fi # Check owner group of $key GROUP="$(/bin/ls -l "$(readlink -f $key)" | sed 's/^.\{12\}[+\.]\?.[^[:space:]]* \([^[:space:]]*\).*/\1/')" if [ "$GROUP" != "root" ]; then log_warning_msg "$dst: INSECURE OWNER GROUP FOR $key, see /usr/share/doc/cryptsetup/README.Debian." fi # Check group and other permissions GMODE="$(/bin/ls -l "$(readlink -f $key)" | sed 's/[[:space:]].*//;s/^.\{4\}\(.\{3\}\).*/\1/')" OMODE="$(/bin/ls -l "$(readlink -f $key)" | sed 's/[[:space:]].*//;s/^.\{7\}\(.\{3\}\).*/\1/')" if [ "$GMODE" != "---" ] && [ "$OMODE" != "---" ]; then log_warning_msg "$dst: INSECURE MODE FOR $key, see /usr/share/doc/cryptsetup/README.Debian." fi return 0 } # Setup a luks mapping do_luks () { local tried keyscriptarg tried=0 keyscriptarg="" if ! cryptsetup isLuks "${CRYPTHEADER:-$src}" >/dev/null 2>&1; then log_warning_msg "$dst: device '${CRYPTHEADER:-$src}' is not a LUKS partition, skipping" return 1 fi if [ -n "$KEYSCRIPT" ]; then # keyscript => "key" is just an argument to the keyscript keyscriptarg="$key" key="-" elif [ -z "$key" ]; then # no keyscript, no key => password keyscriptarg="$promptmsg" key="-" KEYSCRIPT="/lib/cryptsetup/askpass" elif [ "$key" != "${key%/dev/*}" ]; then # no keyscript, device key => special treatment keyscriptarg="" key="$key" KEYSCRIPT="" else # no keyscript, key => file input keyscriptarg="$key" key="-" KEYSCRIPT="cat" fi PARAMS="$PARAMS --key-file=$key" while [ "$tried" -lt "$TRIES" ] || [ "$TRIES" -eq "0" ]; do export CRYPTTAB_TRIED="$tried" if [ -n "$KEYSCRIPT" ]; then if $KEYSCRIPT "$keyscriptarg" | cryptsetup $PARAMS $LUKSPARAMS open --type luks "$src" "${dst}_unformatted"; then break fi else if cryptsetup $PARAMS $LUKSPARAMS open --type luks "$src" "${dst}_unformatted"; then break fi fi tried=$(( $tried + 1 )) if [ "$tried" -ge "$TRIES" ] && [ "$TRIES" -ne "0" ]; then return 1 fi done if [ -n "$CHECK" ] && ! "$CHECK" "/dev/mapper/${dst}_unformatted" $CHECKARGS; then log_warning_msg "$dst: the check for '/dev/mapper/$dst' failed" cryptsetup luksClose "${dst}_unformatted" return 1 fi return 0 } # Setup a tcrypt mapping do_tcrypt () { local tried keyscriptarg tried=0 keyscriptarg="" if ! pre_out="$($PRECHECK "$src" 2>/dev/null)" && \ ! /lib/cryptsetup/checks/blkid "$src" swap >/dev/null; then log_warning_msg "$dst: the precheck for '$src' failed: $pre_out" return 1 fi if [ -n "$KEYSCRIPT" ]; then # keyscript => "key" is just an argument to the keyscript keyscriptarg="$key" key="-" elif [ -z "$key" ]; then # no keyscript, no key => password keyscriptarg="$promptmsg" key="-" KEYSCRIPT="/lib/cryptsetup/askpass" elif [ "$key" != "${key%/dev/*}" ]; then # no keyscript, device key => special treatment keyscriptarg="" key="$key" KEYSCRIPT="" else # no keyscript, key => file input keyscriptarg="$key" key="-" KEYSCRIPT="cat" fi PARAMS="$PARAMS --key-file=$key" while [ "$tried" -lt "$TRIES" ] || [ "$TRIES" -eq "0" ]; do export CRYPTTAB_TRIED="$tried" if [ -n "$KEYSCRIPT" ]; then if $KEYSCRIPT "$keyscriptarg" | cryptsetup $PARAMS $TCRYPTPARAMS open --type tcrypt "$src" "${dst}_unformatted"; then break fi else if cryptsetup $PARAMS $TCRYPTPARAMS open --type tcrypt "$src" "${dst}_unformatted"; then break fi fi tried=$(( $tried + 1 )) if [ "$tried" -ge "$TRIES" ] && [ "$TRIES" -ne "0" ]; then return 1 fi done if [ -n "$CHECK" ] && ! "$CHECK" "/dev/mapper/${dst}_unformatted" $CHECKARGS; then log_warning_msg "$dst: the check for '/dev/mapper/$dst' failed" cryptsetup luksClose "${dst}_unformatted" return 1 fi return 0 } # Setup a regular mapping do_noluks () { local pre_out tried keyscriptarg tried=0 keyscriptarg="" if [ -z "$PRECHECK" ]; then PRECHECK="/lib/cryptsetup/checks/un_blkid" fi if ! pre_out="$($PRECHECK "$src" 2>/dev/null)" && \ ! /lib/cryptsetup/checks/blkid "$src" swap >/dev/null; then log_warning_msg "$dst: the precheck for '$src' failed: $pre_out" return 1 fi if [ -n "$KEYSCRIPT" ]; then # keyscript => "key" is just an argument to the keyscript keyscriptarg="$key" key="-" elif [ -z "$key" ]; then # no keyscript, no key => password keyscriptarg="$promptmsg" key="-" KEYSCRIPT="/lib/cryptsetup/askpass" else # no keyscript, key => file input keyscriptarg="" key="$key" KEYSCRIPT="" fi PARAMS="$PARAMS --key-file=$key" while [ "$tried" -lt "$TRIES" ]; do export CRYPTTAB_TRIED="$tried" if [ -n "$KEYSCRIPT" ]; then $KEYSCRIPT "$keyscriptarg" | cryptsetup $PLAINPARAMS $PARAMS open --type plain "$src" "${dst}_unformatted" else cryptsetup $PLAINPARAMS $PARAMS open --type plain "$src" "${dst}_unformatted" fi if [ -z "$CHECK" ] || "$CHECK" "/dev/mapper/${dst}_unformatted" $CHECKARGS; then break else log_warning_msg "$dst: the check for '/dev/mapper/$dst' failed - maybe the password is wrong" cryptsetup remove "${dst}_unformatted" fi tried=$(( $tried + 1 )) if [ "$tried" -ge "$TRIES" ]; then return 1 fi done return 0 } # Premounts file systems mount_fs () { local point MOUNTED="" for point in $MOUNT; do if mount "$point" >/dev/null; then MOUNTED="$MOUNTED $point" fi done } # Postunmounts file systems umount_fs () { local point for point in $MOUNTED; do umount "$point" >/dev/null done } # Prepares swap partitions using random keys do_swap () { local swap_out if [ "$MAKESWAP" != "yes" ] || [ ! -b "/dev/mapper/${dst}_unformatted" ]; then return 0 fi if swap_out="$(/lib/cryptsetup/checks/un_blkid "/dev/mapper/${dst}_unformatted" 2>/dev/null)" || \ /lib/cryptsetup/checks/blkid "/dev/mapper/${dst}_unformatted" swap >/dev/null 2>&1; then mkswap "/dev/mapper/${dst}_unformatted" >/dev/null 2>&1 else log_warning_msg "$dst: the check for '/dev/mapper/$dst' failed. /dev/mapper/$dst contains data: $swap_out" do_close return 1 fi return 0 } # Prepares tmp partitions using random keys do_tmp () { if [ "x$TMPFS" = "x" ] || [ ! -b "/dev/mapper/${dst}_unformatted" ]; then return 0 fi mkfs -t $TMPFS -q "/dev/mapper/${dst}_unformatted" >/dev/null 2>&1 || return 1 mkdir -p "/var/run/cryptsetup/$dst" mount -t $TMPFS "/dev/mapper/${dst}_unformatted" "/var/run/cryptsetup/$dst" || return 1 chmod 1777 "/var/run/cryptsetup/$dst" umount "/var/run/cryptsetup/$dst" return 0 } # Rename the device from its temp name to its final name, which will # trigger mountall finalize_device () { if command -v udevadm >/dev/null 2>&1; then udevadm settle fi dmsetup rename "${dst}_unformatted" "$dst" } # Removes a mapping do_close () { local found IFS opt found="no" IFS=',' for opt in $opts; do if [ "$opt" = "luks" ]; then found="yes" break fi done if [ "$found" = "yes" ]; then cryptsetup luksClose "$dst" else cryptsetup remove "$dst" fi return $? } load_optimized_module () { local module optmodule module="$1" optmodule=$(find "/lib/modules/$(uname -r)/kernel/arch" -name "${module}*.ko" 2>/dev/null) if [ -n "$optmodule" ] && [ "$(echo -n "$optmodule" | wc -l)" -eq 1 ]; then modprobe "$optmodule" 2>/dev/null && return 0 fi modprobe "$module" 2>/dev/null || return 1 return 0 } # Sets up all entries in crypttab handle_crypttab_line_start () { dst=$1 src=$2 key=$3 opts=$4 # Make sure that all fields are present if [ -z "$dst" ]; then return 1 elif [ -z "$src" ] || [ -z "$key" ] || [ -z "$opts" ]; then device_msg "$dst" "skipped, missing parameters" return 1 fi # parse UUID= symlinks if [ "${src#UUID=}" != "$src" ]; then src="/dev/disk/by-uuid/${src#UUID=}" elif [ "${src#LABEL=}" != "$src" ]; then src="/dev/disk/by-label/$(printf '%s' "${src#LABEL=}" | sed 's,/,\\x2f,g')" fi # Do the preparatory steps if ! parse_opts "$opts"; then device_msg "$dst" "invalid opts" return 1 fi # Ignore noauto devices if [ "$IGNORE" = "yes" ] && [ -z "$FORCE_START" ]; then device_msg "$dst" "ignored" return 0 fi if ! check_key; then device_msg "$dst" "invalid key" return 1 fi # Export crypttab fields as environment variables export CRYPTTAB_NAME="$dst" export CRYPTTAB_SOURCE="$src" export CRYPTTAB_KEY="$key" # Make sure source device exists if [ ! -r "$src" ]; then if [ "$LOUD" = "yes" ]; then device_msg "$dst" "skipped, device $src does not exist" return 1 fi return 0 fi # Make sure that target device doesn't exist if [ -b "/dev/mapper/${dst}_unformatted" ] || [ -b "/dev/mapper/$dst" ]; then device_msg "$dst" "running" return 0 fi # Prepare the unlocking prompt if [ "${src#/dev/disk/by-uuid/}" != "$src" ]; then # UUIDs are not very helpful diskname="$dst" else diskname="$src ($dst)" fi promptmsg="Please unlock disk $diskname: " # All checks passed, do the real setup log_action_msg "$dst (starting).." result="ok" if [ "$USELUKS" = "yes" ]; then do_luks || result="fail" elif [ "$USETCRYPT" = "yes" ]; then do_tcrypt || result="fail" else do_noluks || result="fail" fi # Finish up if [ "$result" != "ok" ]; then device_msg "$dst" "failed" return 1 else do_swap do_tmp finalize_device device_msg "$dst" "started" fi return 0 } handle_crypttab_line_stop () { dst=$1 src=$2 key=$3 opts=$4 if [ ! -b "/dev/mapper/$dst" ]; then device_msg "$dst" "stopped" return 0 fi opencount=$(dmsetup info -c --noheadings -o open "$dst" 2>/dev/null || true) if [ -z "$opencount" ]; then device_msg "$dst" "error" return 1 elif [ "$opencount" != "0" ]; then device_msg "$dst" "busy" if [ "$INITSTATE" = "early" ] || [ "$INITSTATE" = "manual" ]; then return 1 elif [ "$INITSTATE" = "remaining" ]; then return 2 fi return 0 fi #major=$(dmsetup info -c --noheadings -o major "$dst" 2>/dev/null || true) #minor=$(dmsetup info -c --noheadings -o minor "$dst" 2>/dev/null || true) src_major="$(dmsetup deps "$dst" 2>/dev/null | sed -e 's/^.*(\([0-9]*\), [0-9]*)$/\1/g' || true)" src_minor="$(dmsetup deps "$dst" 2>/dev/null | sed -e 's/^.*([0-9]*, \([0-9]*\))$/\1/g' || true)" if [ -z "$src_major" ] || [ -z "$src_minor" ]; then device_msg "$dst" "error" return 1 fi do_close || return $? device_msg "$dst" "stopping" return 0 } crypttab_start_one_disk () { local dst src key opts result local ret=0 egrep -v "^[[:space:]]*(#|$)" "$TABFILE" | while read dst src key opts; do if [ "xUUID=$ID_FS_UUID" = "x$src" ]; then src="/dev/disk/by-uuid/${src#UUID=}" elif [ "xLABEL=$ID_FS_LABEL_ENC" = "x$src" ]; then src="/dev/disk/by-label/$(printf '%s' "${src#LABEL=}" | sed 's,/,\\x2f,g')" elif [ "x$1" != "x$src" ]; then found= for link in $DEVLINKS; do if [ "x$link" = "x$src" ]; then found=1 break fi done if [ -z "$found" ]; then continue fi fi modprobe -qb dm-mod || true modprobe -qb dm-crypt || true dmsetup mknodes > /dev/null 2>&1 || true # FIXME: no locking mount_fs handle_crypttab_line_start "$dst" "$src" "$key" "$opts" || ret=$? umount_fs done return $ret } # Starts all mappings in crypttab do_start () { local dst src key opts result modprobe -qb dm-mod || true modprobe -qb dm-crypt || true dmsetup mknodes >/dev/null 2>&1 || true if [ "$INITSTATE" != "init" ]; then log_action_begin_msg "Starting $INITSTATE crypto disks" fi mount_fs egrep -v "^[[:space:]]*(#|$)" "$TABFILE" | while read dst src key opts; do dev_match="$src" if [ "${dev_match#UUID=}" != "$dev_match" ]; then dev_match="$(readlink -f /dev/disk/by-uuid/${dev_match#UUID=})" elif [ "${dev_match#LABEL=}" != "$dev_match" ]; then dev_match="$(readlink -f "/dev/disk/by-label/$(printf '%s' "${dev_match#LABEL=}" | sed 's,/,\\x2f,g')")" fi # only required for the (ubuntu) upstart init system: # if there's already a udev-triggered job running for this # device, wait for it to finish, then re-process to confirm # that it's started successfully. In the general case this # will just be a no-op, but we don't want to defer to the # other job entirely because this is the fallback for fixing # up any ordering-dependent decrypting. [ -x /sbin/status ] && while /sbin/status cryptdisks-udev DEVNAME="$dev_match" 2>&1 | grep -q "\