diff options
| -rwxr-xr-x | src/file_system_reporter.sh | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/file_system_reporter.sh b/src/file_system_reporter.sh new file mode 100755 index 0000000..e88d70d --- /dev/null +++ b/src/file_system_reporter.sh @@ -0,0 +1,92 @@ +#!/bin/bash +# +# file_system_reporter.sh - hash the files on the boot device and compare +# +# This hashes files in $BOOTDEVICE_FILESYSTEM recursively and hashes the entire +# $BOOTDEVICE as well This must be run as root or as a user that has access to +# the specific device. +# + +BOOTDEVICE="/dev/sda1"; +BOOTDEVICE_FILESYSTEM="/boot/"; +STATE_DIR="/var/lib/smartmonster"; +PREVIOUS_BOOTDEVICE_FILESYSTEM_FILE="$STATE_DIR/previous_bootdevice_files_state"; +CURRENT_BOOTDEVICE_FILESYSTEM_FILE="$STATE_DIR/current_bootdevice_files_state"; +PREVIOUS_BOOTDEVICE_RAW_FILE="$STATE_DIR/previous_bootdevice_raw_state"; +CURRENT_BOOTDEVICE_RAW_FILE="$STATE_DIR/current_bootdevice_raw_state"; +TAMPER=0; +HASHER="`which sha256deep`"; +HASHER_ARGS="-r"; + +if [ "$USER" != "root" ]; +then + echo "You must be root!"; + exit 1; +fi + +# XXX: Hello TOCTOU! +if [ ! -d "$STATE_DIR" ]; +then + echo "You have no $STATE_DIR; creating it!"; + mkdir -p $STATE_DIR; + + if [ $? != 0 ]; + then + echo "Unable to create $STATE_DIR!"; + exit 1; + fi + +fi + +# Hash all files and store the state in $STATE_DIR +echo "Hashing files in $BOOTDEVICE_FILESYSTEM"; +if [ ! -f "$PREVIOUS_BOOTDEVICE_FILESYSTEM_FILE" ]; +then + echo "You have no $PREVIOUS_BOOTDEVICE_FILESYSTEM_FILE!"; + echo "Assuming first run and populating with hashes!"; + $HASHER $HASHER_ARGS $BOOTDEVICE_FILESYSTEM > $PREVIOUS_BOOTDEVICE_FILESYSTEM_FILE; + cp -f $PREVIOUS_BOOTDEVICE_FILESYSTEM_FILE $CURRENT_BOOTDEVICE_FILESYSTEM_FILE; +else + $HASHER $HASHER_ARGS $BOOTDEVICE_FILESYSTEM > $CURRENT_BOOTDEVICE_FILESYSTEM_FILE; +fi + +# Diff and recurse +HASHER_ARGS="-r -x"; +# Now attempt to detect a miss-match of hashes in the $BOOTDEVICE_FILE path +$HASHER $HASHER_ARGS $PREVIOUS_BOOTDEVICE_FILESYSTEM_FILE $BOOTDEVICE_FILESYSTEM; +HASHER_RESULT=$?; +if [ "$HASHER_RESULT" -ge 2 ]; +then + echo "Files on $BOOTDEVICE_FILESYSTEM appear to be mismatched - tampering detected?"; + TAMPER=1; +fi + +# Hash $BOOTDEVICE and store the state in $STATE_DIR +echo "Hashing $BOOTDEVICE"; +if [ ! -f "$PREVIOUS_BOOTDEVICE_RAW_FILE" ]; +then + echo "You have no $PREVIOUS_BOOTDEVICE_RAW_FILE!"; + echo "Assuming first run and populating with hashes!"; + $HASHER $BOOTDEVICE > $PREVIOUS_BOOTDEVICE_RAW_FILE; +else + $HASHER $BOOTDEVICE > $CURRENT_BOOTDEVICE_RAW_FILE; +fi + +# Diff +HASHER_ARGS="-x"; +# Now attempt to detect a miss-match with the $BOOTDEVICE itself +$HASHER $HASHER_ARGS $PREVIOUS_BOOTDEVICE_RAW_FILE $BOOTDEVICE; +HASHER_RESULT=$?; +if [ "$HASHER_RESULT" -ge 3 ]; +then + echo "Files on $BOOTDEVICE_FILESYSTEM appear to be mismatched - tampering detected?"; + TAMPER=1; +fi + +if [ "$TAMPER" -eq 1 ]; +then + echo "Possible tampering detected - please inspect with caution!"; + exit 1; +else + exit 0; +fi |