Keskne logihaldus Rsyslog ja SEC näitel

Ülesande püstitus

Juhendi eesmärgiks on luua keskne logihaldus Rsyslog ja SEC näitel ning esmane logi seire.

Kasutatud tarkvara ja virtuaalmasinad

Tarkvara

Rsyslog 5.8.6
SEC 2.5.3

Virtuaalmasinad

1) Keskne logiserver: Ubuntu Server 64bit versioon 12.04.3 LTS.
IP aadress: 192.168.56.201
2) Klient: Ubuntu Desktop 64bit versioon 13.
IP aadress: 192.168.56.101

Logiserveri seadistamine

Rsyslog [1]

1) Luua uus virtuaalmasin unikaalse IP-aadressiga.

2) Seejärel tuleks luua kaust logide jaoks.
NB! Kõik käsklused peaksid olema SUDO õigustes

mkdir /var/log/remote

3) Pärast seda tuleks anda kaustale grupi automaatse kirjutamise õigus

chmod g+ws /var/log/remote/

4) Samuti tuleks ka kausta omanik ära vahetada, et syslogil oleks täiendavad õigused.

chown syslog:adm /var/log/remote/

5) Seejärel tuleks lisada konfiguratsioonifaili(/etc/rsyslog.conf) järgnevad read:

# provides TCP syslog reception
$ModLoad imtcp
#default port 514 do not work untill rsyslog has been updated.
$InputTCPServerRun 1025

# This one is the template to generate the log filename dynamically, depending on the client's IP address.
$template FILENAME,"/var/log/remote/%fromhost-ip%/syslog.log"

# Log all messages to the dynamically formed file. Now each clients log (192.168.56.*), will be under a separate directory which is formed by the template FILENAME.
*.* ?FILENAME

6) Pärast seda tuleks kliendi masina konfiguratsioonifaili(/etc/rsyslog.conf) lisada.

# provides TCP syslog reception
$ModLoad imtcp
#default port 514 do not work untill rsyslog has been updated.
$InputTCPServerRun 1025

# Provides TCP forwarding.
#default port 514 do not work untill rsyslog has been updated.
 *.* @@192.168.56.201:1025

SEC [2]

1) Installige SEC

apt-get update
apt-get install sec

2) Seejärel tuleks luua kaust

mkdir /etc/sec

3) Pärast seda tuleks luua reegli fail

vim /etc/sec/rule1.conf

4) Reegli faili sisuks tuleks lisada

type=PairWithWindow # Kasutatakse kahte tingimust (mustrit)
ptype=RegExp # mustri tüüp
pattern=sshd\[\d+\]: Failed .+ for (\S+) from ([\d.]+) port \d+ ssh2 # muster, mida otsitakse
desc=User $1 has been unable to log in from $2 over SSH during 1 minute # kirjeldus
action=pipe ' %t: %s' /bin/echo %t: %s >> /etc/test
ptype2=RegExp
pattern2=sshd\[\d+\]: Accepted .+ for $1 from $2 port \d+ ssh2 
desc2=SSH login successful for %1 from %2 after initial failure
action2=logonly
window=60 #ajaintervall sekundites

Antud reegel logib SSH pordi pihta tehtud ebaõnnestunuid päringuid. 5) Käivitage reegel järgmise käsuga

perl /usr/bin/sec -conf=/etc/sec/rule1.conf -input=/var/log/remote/192.168.56.101/syslog.log

Feeding event ' Wed Jan  8 14:35:05 2014: User student has been unable to log in from 192.168.56.1 over SSH during 1 minute' to shell command '/bin/echo Wed Jan  8 14:35:05 2014: User student has been unable to log in from 192.168.56.1 over SSH during 1 minute >> /etc/test'

SEC reegli teine näide

Järgnev reegel logib Puppeti kleindi sulgemist 1) Loome reegli faili

vim /etc/sec/puppetcheck.conf

2) Defineerime reegli

type=SingleWithThreshold #üks muster
ptype=RegExp
pattern=puppet-agent\[\d+\]: Puppet client disabled
desc=Puppeti klient forced to close by $1
action=pipe '%t : %s' /bin/mail 'puppet error' root@localhost # saadetakse mail
window=3600 #intervall
thresh=1  # kordade arv enne saatmist

Kontrollida saab antud käslusega

logger -t puppet-agent -i Puppet client disabled

Kasutatud kirjandus

http://www.canonical.com/sites/default/files/active/Whitepaper-CentralisedLogging-v1.pdf
http://www.thegeekstuff.com/2012/01/rsyslog-remote-logging/
http://www.occam.com/sa/CentralizedLogging2012.pdf http://simple-evcorr.sourceforge.net/SEC-tutorial/article.html