88 lines
2.3 KiB
Bash
Executable File
88 lines
2.3 KiB
Bash
Executable File
#!/bin/sh
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#Hashes all files in /boot to check them during early boot
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#Exit codes: 0 = success, 1 = wrong usage, 2 = not root, 3 = no hasher found, 4 = checksum mismatch
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VERSION="0.3"
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DIGEST_FILE="/var/lib/hashboot.digest"
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LOG_FILE="/tmp/hashboot.log"
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BACKUP_FILE="/var/cache/boot-backup.tar.gz"
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HASHER=""
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BOOT_MOUNTED=""
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#Umount /boot if we mounted it, exit with given exit code
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function die
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{
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if [ ! -z ${BOOT_MOUNTED} ]
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then
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umount /boot
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fi
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exit ${1}
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}
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#If we're not root: exit
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if [ ${UID} -ne 0 ]
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then
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echo "You have to be root" >&2
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die 2
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fi
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#Try different hashers, use the most secure
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HASHER=$(/usr/bin/which --skip-dot --skip-tilde sha512sum 2> /dev/null)
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test -z ${HASHER} && $(/usr/bin/which --skip-dot --skip-tilde sha384sum 2> /dev/null)
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test -z ${HASHER} && $(/usr/bin/which --skip-dot --skip-tilde sha256sum 2> /dev/null)
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test -z ${HASHER} && $(/usr/bin/which --skip-dot --skip-tilde sha224sum 2> /dev/null)
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#It gets insecure below here, but better than nothing?
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test -z ${HASHER} && $(/usr/bin/which --skip-dot --skip-tilde sha1sum 2> /dev/null)
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test -z ${HASHER} && $(/usr/bin/which --skip-dot --skip-tilde md5sum 2> /dev/null)
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#If we found no hasher: exit
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if [ -z ${HASHER} ]
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then
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echo "No hash calculator found" >&2
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die 3
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fi
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#If /boot is in fstab but not mounted: mount, mark as mounted
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if grep -q '/boot.*noauto' /etc/fstab && ! grep -q /boot /etc/mtab
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then
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mount /boot
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BOOT_MOUNTED=1
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fi
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if [ "${1}" == "index" ]
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then
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#Write header
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echo "#hashboot ${VERSION} - Algorithm: $(basename ${HASHER})" > ${DIGEST_FILE}
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#Write hashes of all regular files to ${DIGEST_FILE}
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find /boot -type f -exec ${HASHER} --binary {} >> ${DIGEST_FILE} +
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#Backup of good files
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tar -czpPf ${BACKUP_FILE} /boot
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die 0
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elif [ "${1}" == "check" ]
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then
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if $(${HASHER} --check --warn --quiet --strict ${DIGEST_FILE} > ${LOG_FILE})
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then
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die 0
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else
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echo " !! TIME TO PANIK: A FILE WAS MODIFIED !!"
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echo "Restoring files from backup... (type yes or no for each file)"
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#For each failed file: ask if it should be recovered from backup
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for file in $(cut -d: -f1 ${LOG_FILE})
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do
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tar -xzpPvwf ${BACKUP_FILE} ${file}
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done
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echo -n "Type reboot to reboot now, otherwise you get a shell: "
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read -r reboot
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if [ ${reboot} == "reboot" ]
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then
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reboot
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fi
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die 4
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fi
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else
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echo "Usage: ${0} index|check" >&2
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die 1
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fi |