Add a new role - Logsentry is a tool that scans system logs to report suspicious/unusual activity

Tristan PILAT 3 years ago
parent e9a1373a30
commit d84fc581d8

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# logsentry
Installation and custom configuration of logsentry (formely logcheck)
## Tasks
Everything is in the `tasks/main.yml` file.

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# Log file checker
# Written by Craig Rowland <>
# This file needs the program logtail.c to run
# This script checks logs for unusual activity and blatant
# attempts at hacking. All items are mailed to administrators
# for review. This script and the logtail.c program are based upon
# the script idea from the Gauntlet(tm) Firewall
# (c)Trusted Information Systems Inc. The original authors are
# Marcus J. Ranum and Fred Avolio.
# Default search files are tuned towards the TIS Firewall toolkit
# the TCP Wrapper program. Custom daemons and reporting facilites
# can be accounted for as the rest of the script for
# details.
# Version Information
# 1.0 9/29/96 -- Initial Release
# 1.01 11/01/96 -- Added working /tmp directory for symlink protection
# (Thanks Richard Bullington (
# 1.1 1/03/97 -- Made this script more portable for Sun's.
# 1/03/97 -- Made this script work on HPUX
# 5/14/97 -- Added Digital OSF/1 logging support. Big thanks
# to Jay Vassos-Libove <> for
# his changes.
# Logcheck is pre-configured to work on most BSD like systems, however it
# is a rather dumb program and may need some help to work on other
# systems. Please check the following command paths to ensure they are
# correct.
# Person to send log activity to.
# Full path to logtail program.
# This program is required to run this script and comes with the package.
# Full path to SECURED (non public writable) /tmp directory.
# Prevents Race condition and potential symlink problems. I highly
# recommend you do NOT make this a publically writable/readable directory.
# You would also be well advised to make sure all your system/cron scripts
# use this directory for their "scratch" area.
# The 'grep' command. This command MUST support the
# '-i' '-v' and '-f' flags!! The GNU grep does this by default (that's
# good GNUs for you Linux/FreeBSD/BSDI people :) ). The Sun grep I'm told
# does not support these switches, but the 'egrep' command does (Thanks
# Jason <> ). Since grep and egrep are usually the GNU
# variety on most systems (well most Linux, FreeBSD, BSDI, etc) and just
# hard links to each other we'll just specify egrep here. Change this if
# you get errors.
# Linux, FreeBSD, BSDI, Sun, HPUX, etc.
# The 'mail' command. Most systems this should be OK to leave as is.
# If your default mail command does not support the '-s' (subject) command
# line switch you will need to change this command one one that does.
# The only system I've seen this to be a problem on are HPUX boxes.
# Naturally, the HPUX is so superior to the rest of UNIX OS's that they
# feel they need to do everything differently to remind the rest that
# they are the best ;).
# Linux, FreeBSD, BSDI, Sun, etc.
# HPUX 10.x and others(?)
# Digital OSF/1, Irix
# File of known active hacking attack messages to look for.
# Only put messages in here if you are sure they won't cause
# false alarms. This is a rather generic way of checking for
# malicious activity and can be inaccurate unless you know
# what past hacking activity looks like. The default is to
# look for generic ISS probes (who the hell else looks for
# "WIZ" besides ISS?), and obvious sendmail attacks/probes.
# File of security violation patterns to specifically look for.
# This file should contain keywords of information administrators should
# probably be aware of. May or may not cause false alarms sometimes.
# Generally, anything that is "negative" is put in this file. It may miss
# some items, but these will be caught by the next check. Move suspicious
# items into this file to have them reported regularly.
# File that contains more complete sentences that have keywords from
# the violations file. These keywords are normal and are not cause for
# concern but could cause a false alarm. An example of this is the word
# "refused" which is often reported by sendmail if a message cannot be
# delivered or can be a more serious security violation of a system
# attaching to illegal ports. Obviously you would put the sendmail
# warning as part of this file. Use your judgement before putting words
# in here or you can miss really important events. The default is to leave
# this file with only a couple entries. DO NOT LEAVE THE FILE EMPTY. Some
# grep's will assume that an EMPTY file means a wildcard and will ignore
# everything! The basic configuration allows for the more frequent sendmail
# error.
# Again, be careful what you put in here and DO NOT LEAVE IT EMPTY!
# This is the name of a file that contains patterns that we should
# ignore if found in a log file. If you have repeated false alarms
# or want specific errors ignored, you should put them in here.
# Once again, be as specific as possible, and go easy on the wildcards
# The files are reported in the order of hacking, security
# violations, and unusual system events. Notice that this
# script uses the principle of "That which is not explicitely
# ignored is reported" in that the script will report all items
# that you do not tell it to ignore specificially. Be careful
# how you use wildcards in the logcheck.ignore file or you
# may miss important entries.
# Make sure we really did clean up from the last run.
# Also this ensures that people aren't trying to trick us into
# overwriting files that we aren't supposed to. This is still a race
# condition, but if you are in a temp directory that does not have
# generic luser access it is not a problem. Do not allow this program
# to write to a generic /tmp directory where others can watch and/or
# create files!!
# Shouldn't need to touch these...
DATE=`date +%m/%d/%y:%H.%M`
umask 077
rm -f $TMPDIR/check.$$ $TMPDIR/checkoutput.$$ $TMPDIR/checkreport.$$
if [ -f $TMPDIR/check.$$ -o -f $TMPDIR/checkoutput.$$ -o -f $TMPDIR/checkreport.$$ ]; then
echo "Log files exist in $TMPDIR directory that cannot be removed. This
may be an attempt to spoof the log checker." \
exit 1
# You might have to customize these entries depending on how
# you have syslogd configured. Be sure you check all relevant logs.
# The logtail utility is required to read and mark log files.
# See INSTALL for more information. Again, using one log file
# is preferred and is easier to manage. Be sure you know what the
# > and >> operators do before you change them. LOG FILES SHOULD
# ALWAYS BE chmod 600 OWNER root!!
# Generic and Linux Slackware 3.x
#$LOGTAIL /var/log/messages > $TMPDIR/check.$$
# OpenBSD 2.x, 3.x
$LOGTAIL /var/log/messages > $TMPDIR/check.$$
$LOGTAIL /var/log/maillog >> $TMPDIR/check.$$
$LOGTAIL /var/log/authlog >> $TMPDIR/check.$$
$LOGTAIL /var/log/secure >> $TMPDIR/check.$$
$LOGTAIL /var/log/daemon >> $TMPDIR/check.$$
$LOGTAIL /var/log/xferlog >> $TMPDIR/check.$$
# Linux Red Hat Version 3.x, 4.x
#$LOGTAIL /var/log/messages > $TMPDIR/check.$$
#$LOGTAIL /var/log/secure >> $TMPDIR/check.$$
#$LOGTAIL /var/log/maillog >> $TMPDIR/check.$$
# FreeBSD 2.x
#$LOGTAIL /var/log/messages > $TMPDIR/check.$$
#$LOGTAIL /var/log/maillog >> $TMPDIR/check.$$
# BSDI 2.x
#$LOGTAIL /var/log/messages > $TMPDIR/check.$$
#$LOGTAIL /var/log/secure >> $TMPDIR/check.$$
#$LOGTAIL /var/log/maillog >> $TMPDIR/check.$$
#$LOGTAIL /var/log/ftp.log >> $TMPDIR/check.$$
# Un-comment out the line below if you are using BSDI 2.1
#$LOGTAIL /var/log/daemon.log >> $TMPDIR/check.$$
# SunOS, Sun Solaris 2.5
#$LOGTAIL /var/log/syslog > $TMPDIR/check.$$
#$LOGTAIL /var/adm/messages >> $TMPDIR/check.$$
# HPUX 10.x and others(?)
#$LOGTAIL /var/adm/syslog/syslog.log > $TMPDIR/check.$$
# Digital OSF/1
# OSF/1 - uses rotating log directory with date & time in name
# LOGDIRS=`find /var/adm/syslog.dated/* -type d -prune -print`
# LOGDIR=`ls -dtr1 $LOGDIRS | tail -1`
# if [ ! -d "$LOGDIR" ]
# then
# echo "Can't identify current log directory." >> $TMPDIR/checkrepo$
# else
# $LOGTAIL $LOGDIR/auth.log >> $TMPDIR/check.$$
# $LOGTAIL $LOGDIR/daemon.log >> $TMPDIR/check.$$
# $LOGTAIL $LOGDIR/kern.log >> $TMPDIR/check.$$
# $LOGTAIL $LOGDIR/lpr.log >> $TMPDIR/check.$$
# $LOGTAIL $LOGDIR/mail.log >> $TMPDIR/check.$$
# $LOGTAIL $LOGDIR/syslog.log >> $TMPDIR/check.$$
# $LOGTAIL $LOGDIR/user.log >> $TMPDIR/check.$$
# fi
# Set the flag variables
# See if the tmp file exists and actually has data to check,
# if it doesn't we should erase it and exit as our job is done.
if [ ! -s $TMPDIR/check.$$ ]; then
rm -f $TMPDIR/check.$$
exit 0
# Perform Searches
# Check for blatant hacking attempts
if [ -f "$HACKING_FILE" ]; then
if $GREP -i -f $HACKING_FILE $TMPDIR/check.$$ > $TMPDIR/checkoutput.$$; then
echo >> $TMPDIR/checkreport.$$
echo "Active System Attack Alerts" >> $TMPDIR/checkreport.$$
echo "=-=-=-=-=-=-=-=-=-=-=-=-=-=" >> $TMPDIR/checkreport.$$
cat $TMPDIR/checkoutput.$$ >> $TMPDIR/checkreport.$$
# Check for security violations
if [ -f "$VIOLATIONS_FILE" ]; then
if $GREP -i -f $VIOLATIONS_FILE $TMPDIR/check.$$ |
$GREP -v -f $VIOLATIONS_IGNORE_FILE > $TMPDIR/checkoutput.$$; then
echo >> $TMPDIR/checkreport.$$
echo "Security Violations" >> $TMPDIR/checkreport.$$
echo "=-=-=-=-=-=-=-=-=-=" >> $TMPDIR/checkreport.$$
cat $TMPDIR/checkoutput.$$ >> $TMPDIR/checkreport.$$
# Do reverse grep on patterns we want to ignore
if [ -f "$IGNORE_FILE" ]; then
if $GREP -v -f $IGNORE_FILE $TMPDIR/check.$$ > $TMPDIR/checkoutput.$$; then
echo >> $TMPDIR/checkreport.$$
echo "Unusual System Events" >> $TMPDIR/checkreport.$$
echo "=-=-=-=-=-=-=-=-=-=-=" >> $TMPDIR/checkreport.$$
cat $TMPDIR/checkoutput.$$ >> $TMPDIR/checkreport.$$
# If there are results, mail them to sysadmin
if [ "$ATTACK" -eq 1 ]; then
elif [ "$FOUND" -eq 1 ]; then
cat $TMPDIR/checkreport.$$ | $MAIL -s "$HOSTNAME $DATE system check" $SYSADMIN
# Clean Up
rm -f $TMPDIR/check.$$ $TMPDIR/checkoutput.$$ $TMPDIR/checkreport.$$

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- name: Install logsentry
- logsentry--
state: present
- logsentry
- name: Copy logsentry script to /usr/share/scripts
dest: /usr/share/scripts/
owner: root
group: wheel
mode: "0644"
- logsentry
- name: hourly cron job for is installed
name: logsentry
minute: "11"
job: >
/bin/sh /usr/share/scripts/
- logsentry