mirror of
https://schlomp.space/tastytea/hashboot
synced 2024-11-16 14:37:06 +01:00
111 lines
2.6 KiB
Bash
Executable File
111 lines
2.6 KiB
Bash
Executable File
#!/bin/sh
|
|
#Hashes all files in /boot to check them during early boot
|
|
#Exit codes: 0 = success, 1 = wrong usage, 2 = not root, 3 = no hasher found,
|
|
#4 = checksum mismatch, 5 = write error
|
|
|
|
VERSION="0.5"
|
|
PATH="/bin:/usr/bin:/sbin:/usr/sbin"
|
|
|
|
|
|
DIGEST_FILE="/var/lib/hashboot.digest"
|
|
LOG_FILE="/tmp/hashboot.log"
|
|
BACKUP_FILE="/var/cache/boot-backup.tar.gz"
|
|
HASHER=""
|
|
BOOT_MOUNTED=""
|
|
|
|
|
|
#Umount /boot if we mounted it, exit with given exit code
|
|
function die
|
|
{
|
|
if [ ! -z ${BOOT_MOUNTED} ]
|
|
then
|
|
umount /boot
|
|
fi
|
|
|
|
exit ${1}
|
|
}
|
|
|
|
function recover
|
|
{
|
|
echo "Restoring files from backup... (type yes or no for each file)"
|
|
|
|
#For each failed file: ask if it should be recovered from backup
|
|
for file in $(cut -d: -f1 ${LOG_FILE})
|
|
do
|
|
tar -xzpPvwf ${BACKUP_FILE} ${file}
|
|
[ $? != 0 ] && echo "Error restoring ${file} from backup, continuing"
|
|
done
|
|
}
|
|
|
|
#If we're not root: exit
|
|
if [ ${UID} -ne 0 ]
|
|
then
|
|
echo "You have to be root" >&2
|
|
die 2
|
|
fi
|
|
|
|
#Try different hashers, use the most secure
|
|
HASHER=$(/usr/bin/which --skip-dot --skip-tilde sha512sum 2> /dev/null)
|
|
test -z ${HASHER} && $(/usr/bin/which --skip-dot --skip-tilde sha384sum 2> /dev/null)
|
|
test -z ${HASHER} && $(/usr/bin/which --skip-dot --skip-tilde sha256sum 2> /dev/null)
|
|
test -z ${HASHER} && $(/usr/bin/which --skip-dot --skip-tilde sha224sum 2> /dev/null)
|
|
#It gets insecure below here, but better than nothing?
|
|
test -z ${HASHER} && $(/usr/bin/which --skip-dot --skip-tilde sha1sum 2> /dev/null)
|
|
test -z ${HASHER} && $(/usr/bin/which --skip-dot --skip-tilde md5sum 2> /dev/null)
|
|
|
|
#If we found no hasher: exit
|
|
if [ -z ${HASHER} ]
|
|
then
|
|
echo "No hash calculator found" >&2
|
|
die 3
|
|
fi
|
|
|
|
#If /boot is in fstab but not mounted: mount, mark as mounted
|
|
if grep -q '/boot.*noauto' /etc/fstab && ! grep -q /boot /etc/mtab
|
|
then
|
|
mount /boot
|
|
BOOT_MOUNTED=1
|
|
fi
|
|
|
|
if [ "${1}" == "index" ]
|
|
then
|
|
#Write header
|
|
echo "#hashboot ${VERSION} - Algorithm: $(basename ${HASHER})" > ${DIGEST_FILE}
|
|
#Write hashes of all regular files to ${DIGEST_FILE}
|
|
find /boot -type f -exec ${HASHER} --binary {} >> ${DIGEST_FILE} +
|
|
if [ $? == 0 ]
|
|
then
|
|
echo "List of hashes written to ${DIGEST_FILE}"
|
|
else
|
|
echo "Error writing ${DIGEST_FILE}" >&2
|
|
die 5
|
|
fi
|
|
|
|
#Backup of good files
|
|
tar -czpPf ${BACKUP_FILE} /boot
|
|
if [ $? == 0 ]
|
|
then
|
|
echo "Backup written to ${BACKUP_FILE}"
|
|
else
|
|
echo "Error writing ${BACKUP_FILE}" >&2
|
|
die 5
|
|
fi
|
|
elif [ "${1}" == "check" ]
|
|
then
|
|
if $(${HASHER} --check --warn --quiet --strict ${DIGEST_FILE} > ${LOG_FILE})
|
|
then
|
|
die 0
|
|
else
|
|
echo " !! TIME TO PANIK: AT LEAST 1 FILE WAS MODIFIED !!"
|
|
die 4
|
|
fi
|
|
elif [ "${1}" == "recover" ]
|
|
then
|
|
recover
|
|
else
|
|
echo "Usage: ${0} index|check|recover" >&2
|
|
die 1
|
|
fi
|
|
|
|
die 0
|