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mbr check added

pull/1/head
oh 2015-09-26 11:57:14 +02:00
parent 27e787c366
commit d59eaf7ef8
1 changed files with 73 additions and 54 deletions
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47
hashboot.sh
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@ -1,18 +1,20 @@
#!/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
#Exit codes: 0 = success, 1 = checksum mbr mismatch, 2 = checksum /boot mismatch,
#3 = checksum mbr/boot mismatch, 4 = not root, 5 = no hasher found, 6 = wrong usage,
#7 = write error, 8 = dd error
VERSION="0.6"
VERSION="0.7"
PATH="/bin:/usr/bin:/sbin:/usr/sbin"
DIGEST_FILE="/var/lib/hashboot.digest"
LOG_FILE="/tmp/hashboot.log"
MBR_FILE="/var/lib/mbr.digest"
MBR_TMP="/tmp/mbr"
BACKUP_FILE="/var/cache/boot-backup.tar.gz"
HASHER=""
BOOT_MOUNTED=""
#Umount /boot if we mounted it, exit with given exit code
function die
{
@ -40,7 +42,7 @@ function recover
if [ ${UID} -ne 0 ]
then
echo "You have to be root" >&2
die 2
die 4
fi
#Try different hashers, use the most secure
@ -51,12 +53,11 @@ test -z ${HASHER} && HASHER=$(/usr/bin/which --skip-dot sha224sum 2> /dev/null)
#It gets insecure below here, but better than nothing?
test -z ${HASHER} && HASHER=$(/usr/bin/which --skip-dot sha1sum 2> /dev/null)
test -z ${HASHER} && HASHER=$(/usr/bin/which --skip-dot md5sum 2> /dev/null)
#If we found no hasher: exit
if [ -z ${HASHER} ]
then
echo "No hash calculator found" >&2
die 3
die 5
fi
#If /boot is in fstab but not mounted: mount, mark as mounted
@ -71,39 +72,57 @@ then
#Write header
echo "#hashboot ${VERSION} - Algorithm: $(basename ${HASHER})" > ${DIGEST_FILE}
#Write hashes of all regular files to ${DIGEST_FILE}
err=$(dd if=/dev/sda of=${MBR_TMP} bs=1M count=1 status=noxfer 2>&1) || die 8 >&2
${HASHER} ${MBR_TMP} > ${MBR_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
die 7
fi
#Backup of good files
tar -czpPf ${BACKUP_FILE} /boot
tar -czpPf ${BACKUP_FILE} /boot ${MBR_TMP} ${MBR_FILE}
if [ $? == 0 ]
then
echo "Backup written to ${BACKUP_FILE}"
else
echo "Error writing ${BACKUP_FILE}" >&2
die 5
die 7
fi
elif [ "${1}" == "check" ]
then
if $(${HASHER} --check --warn --quiet --strict ${DIGEST_FILE} > ${LOG_FILE})
COUNTER=0
err=$(dd if=/dev/sda of=${MBR_TMP} bs=1M count=1 status=noxfer 2>&1) || die 8 >&2
if $(${HASHER} --check --warn --quiet --strict ${MBR_FILE} > ${LOG_FILE})
then
echo "MBR ok"
else
echo " !! TIME TO PANIK: MBR WAS MODIFIED !!"
COUNTER=$((COUNTER + 1))
fi
if $(${HASHER} --check --warn --quiet --strict ${DIGEST_FILE} >> ${LOG_FILE})
then
echo "/boot io"
die 0
else
echo " !! TIME TO PANIK: AT LEAST 1 FILE WAS MODIFIED !!"
die 4
COUNTER=$((COUNTER + 2))
die $COUNTER
fi
elif [ "${1}" == "recover" ]
then
recover
else
echo "Usage: ${0} index|check|recover" >&2
die 1
die 6
fi
die 0