Advanced Shell

cp -Rfv /etc ./etc

vim Security.sh

#!/bin/bash

if [ -f "/etc/passwd" ] ; then
echo "passwd file exists"
grep -n -v -f "./etc/passwd" "/etc/passwd"
else
echo "passwd file does not exist"
fi

if [ -f "/etc/group" ] ; then
echo "group file exists"
grep -n -v -f "./etc/group" "/etc/group"
else
echo "group file does not exist"
fi

exit 0

i to edit esc hold shift ZZ to save and exit

to exit without saving hit the esc key then :q! enter

chmod +x Security.sh
./Security

You must have 4 files checked in order to get credit for this assignment. I only do 2 in this example.

Remote Logging And Test

Remote Logging Receiving Server:
Setting Up The Receiving Host:

Red Hat:
vi /etc/sysconfig/rsyslog

CentOS:
vi /etc/sysconfig/syslog

Edit File Change Line To:

SYSLOGD_OPTIONS="-c 2 -r"

i to edit. Esc then shift ZZ to save and exit.

Now Edit:

Red Hat:
vi /etc/rsyslog.conf

CentOS:
vi /etc/syslog.conf

i to edit. Change the lines below Provides UDP syslog reception and Provides TCP syslog reception by un-commenting the lines. Esc then shift ZZ to save and exit.

Update The Remote System Log:

Red Hat:
service rsyslog restart

CentOS:
/sbin/service syslog restart


last

command finds the when people logged in and out of the system along with what time and where from.

last | tail

will give you just the recent logins and logouts.

logger Your Message Goes Here

Lets you test the logging of the log files. Your message will be in the messages log file. You can find the log messages with regards to a certain user by using grep.

grep yourusername /var/log/messages

Setting Up Fail Log

How To Setup Fail Log:
http://www.cyberciti.biz/tips/rhel-centos-fedora-linux-log-failed-login.html