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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 :