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-rwxr-xr-xhandlers/sys.in65
1 files changed, 64 insertions, 1 deletions
diff --git a/handlers/sys.in b/handlers/sys.in
index f293840..de81435 100755
--- a/handlers/sys.in
+++ b/handlers/sys.in
@@ -1,7 +1,7 @@
# -*- mode: sh; sh-basic-offset: 3; indent-tabs-mode: nil; -*-
#
# this handler will save various reports of vital system information.
-# by default, all the reports are enabled and are saved in /var/backups.
+# by default, all the reports are saved in /var/backups.
#
# (1) a capture of the debconf package selection states. This file
# can be used to restore the answers to debconf questions for
@@ -24,6 +24,12 @@
# (4) hardware information.
# write to a text file the important things which hwinfo can gleen.
#
+# (5) the Luks header of every Luks block device, if option luksheaders
+# is enabled.
+# in case you (have to) scramble such a Luks header (for some time),
+# and restore it later by running "dd if=luksheader.sda2.bin of=/dev/sda2"
+# (MAKE SURE YOU PASS THE CORRECT DEVICE AS of= !!!)
+#
if [ -f /etc/debian_version ]
then
@@ -82,6 +88,11 @@ getconf HWINFO `which hwinfo`
getconf sfdisk_options ""
getconf hwinfo_options ""
+getconf CRYPTSETUP `which cryptsetup`
+getconf DD `which dd`
+getconf luksheaders no
+getconf luksheadersfile $parentdir/luksheader.__star__.bin
+
getconf vsnames all
# If vservers are configured, check that the ones listed in $vsnames are running.
@@ -97,6 +108,19 @@ if [ $vservers_are_available = yes ]; then
usevserver=yes
fi
+## SANITY CHECKS #########################
+
+if [ "$luksheaders" == "yes" ]; then
+ if [ ! -x "$DD" ]; then
+ warning "can't find dd, skipping backup of Luks headers."
+ luksheaders="no"
+ fi
+ if [ ! -x "$CRYPTSETUP" ]; then
+ warning "can't find cryptsetup, skipping backup of Luks headers."
+ luksheaders="no"
+ fi
+fi
+
## PACKAGES ##############################
#
@@ -541,3 +565,42 @@ if [ "$partitions" == "yes" ]; then
$HWINFO --disk >> $hardwarefile
fi
fi
+
+if [ "$luksheaders" == "yes" ]; then
+ devices=`LC_ALL=C $SFDISK -l 2>/dev/null | grep "^Disk /dev" | @AWK@ '{print $2}' | cut -d: -f1`
+ [ -n "$devices" ] || warning "No block device found"
+ targetdevices=""
+ for dev in $devices; do
+ [ -b $dev ] || continue
+ debug "$CRYPTSETUP isLuks $dev"
+ $CRYPTSETUP isLuks $dev
+ [ $? -eq 0 ] && targetdevices="$targetdevices $dev"
+ done
+ for dev in $targetdevices; do
+ label=${dev#/dev/}
+ label=${label//\//-}
+ outputfile=${luksheadersfile//__star__/$label}
+ # the following sizes are expressed in terms of 512-byte sectors
+ debug "Let us find out the Luks header size for $dev"
+ debug "$CRYPTSETUP luksDump \"$dev\" | grep '^Payload offset:' | @AWK@ '{print $3}'"
+ headersize=`$CRYPTSETUP luksDump "$dev" | grep '^Payload offset:' | @AWK@ '{print $3}'`
+ if [ $? -ne 0 ]; then
+ warning "Could not compute the size of Luks header, skipping device $dev"
+ continue
+ elif [ -z "$headersize" -o -n "`echo \"$headersize\" | sed 's/[0-9]*//g'`" ]; then
+ warning "The computed size of Luks header is not an integer, skipping device $dev"
+ continue
+ fi
+ debug "Let us backup the Luks header of device $dev"
+ debug "$DD if=\"${dev}\" of=\"${outputfile}\" bs=512 count=\"${headersize}\""
+ output=`$DD if="${dev}" of="${outputfile}" bs=512 count="${headersize}" 2>&1`
+ exit_code=$?
+ if [ $exit_code -eq 0 ]; then
+ debug $output
+ info "The Luks header of $dev was saved to $outputfile."
+ else
+ debug $output
+ fatal "The Luks header of $dev could not be saved."
+ fi
+ done
+fi