fcheck - IDS filesystem baseline integrity checker
The options to fcheck are defined below:
- Automatic mode, do all directories in configuration
- Create a new base line database for the given
- Directory names are to be monitored for changes also.
- -f filename
- Use alternate 'filename' as the configuration file.
- Ignore creation times, check permissions, adds, deletes
- Append the $HOSTNAME to the configuration filename.
- Log information to logger rather than stdout messages.
- Report mode, great for emailed status reports.
- Sign each file with a CRC/hash signature.
- Verbose mode, not used for report generation.
- eXtended unix checks, # of links, UID, GID, Major/Minor
The fcheck utility is an IDS (Intrusion Detection System) which can be used to
monitor changes to any given filesystem.
Essentially, fcheck has the ability to monitor directories, files or complete
filesystems for any additions, deletions, and modifications. It is
configurable to exclude active log files, and can be ran as often as needed
from the command line or cron making it extremely difficult to circumvent.
Flag passing is a fairly simple process. Primarily you will be using two
commands. One builds (or rebuilds) your baseline database files (system
snapshots). The second runs in a scanning comparison mode.
Builds the baseline database.
Comparison scans the system against the baseline database.
For normal operation: Initially you will run fcheck by issuing the command
"fcheck -ac" to create the initial baseline file used for
comparison. Any runs after the creation of the basline will normally be with
the following flags "fcheck "-a"" to scan for any system
After a scan is completed, you will probably want to have fcheck re-create its
baseline database for the next comparison cycle. Otherwise you will be seeing
every system modification since the last baseline re-build. In other words,
run the "fcheck -ac" command again.
(Advanced Note:) A more intensive system check would be accomplished by building
your database to include GID/UID checks, directories, and CRC checks by using
the following sample syntax:
"fcheck -cadsxlf /etc/fcheck/fcheck.cfg"
And provide periodic integrity scans from cron by using the following sample
"fcheck -adsxlf /etc/fcheck/fcheck.cfg"
Author: Copyright (C) 1996 Michael A. Gumienny <email@example.com>
Debianized by: Graham Simpson <firstname.lastname@example.org>
Please also refer to the excellent README and INSTALL instructions provided with
the package /usr/share/doc/fcheck