Ipkungfu Tulemüür

From ICO wiki
Revision as of 18:46, 13 May 2015 by Hniidas (talk | contribs)
Jump to navigationJump to search

Sissejuhatus

Artikli eesmärgiks on tutvustada ipkungfu tulemüüri, anda ülevaade rakenduse paigaldamisest, konfigureerimisest, haldamisest ning eesmärkidest.

Eeldused

Artikli koostamisel on testimiseks kasutatud Ubuntu v.12.04 LTS

Mis on ipkungfu

Tegemist on iptables[1] baasil loodud, kuid lihtsustatud Linuxi tulemüüriga mis hõlbustab võrguliikluse administreerimist. Rakendus töötab iptables ja sysctl baasil. Võib öelda, et tegemist on iptables liidesega mis on omakorda kerneli tulemüürimooduli Netfilter'i kasutajaliides. Tänu lihtsale menüüle sobib rakendus nii algajale kui eksperdile. Toote trumpideks peetakse: [2]

  • Turvalisust
  • Lihtsat hallatavust
  • Jõudlust


Tänu Linuxi kerneli võimekusele leiab tarkvara laialdast rakendust ning toetab [3]

  • Võrguühenduse jagamist
  • Virtualhoste
  • IP suunamist
  • IP maskimist
  • Logide jälgmist ning kontrollimist


Eelised: [4]

  • Võimalik kiiresti paigaldada ning koheselt kasutama hakata
  • Seadistamine lihtne ning vähe aega nõudev
  • Ei vaja töötavat teenust ega erilisi teadmisi


Installeerimine

Tulemüür töötab iptables ja sysctl baasil. Võib öelda, et tegemist on iptables liidesega mis on kerneli tulemüürimooduli Netfilter'i kasutajaliides. Konfiguratsiooni failid asuvad kaustas /etc/ipkungfu (lisa conf fail?) mida on võimalik vastavalt soovile muuta.[5]

  • Enne installimist uuenda olemasolevaid pakette [6]
sudo apt-get update
  • Installi tarkvara
sudo apt-get install ipkungfu
  • ipkungfu käivitamine
sudo ipkungfu
  • ipkungfu rakenduse peatamine
ipkungfu -d

Konfigureerimine

Konfiguratsiooni failid asuvad kaustas /etc/ipkungfu mida on võimalik vastavalt soovile muuta.[7]

  • Ava fail /etc/ipkungfu/ipkungfu.conf [FAILI LINK]
nano /etc/ipkungfu/ipkungfu.conf

Muudan faili vastavalt soovile. Testis tegin järgmised muudatused failis:

  • Määran logide asukoha
# Set the path to ipkungfu's runtime error log.
# Default: /var/log/ipkungfu.log
IPKUNGFU_LOG=/var/log/ipconfig.log
  • Määran IP vahemiku
# IP Range of your internal network.  Use "127.0.0.1"
# for a standalone machine.  Default is a reasonable
# guess. Separate multiple ranges with spaces.
LOCAL_NET="192.168.0.0/255.255.0.0"
  • Eemaldan kommentaari
# Set this to 0 for a standalone machine, or 1 for
# a gateway device to share an Internet connection.
# Default is 1.
GATEWAY=1
  • Määran keelatud pordid
# Temporarily block future connection attempts from an
# IP that hits these ports (If module is present)
# Hits to these ports will be logged as "BADGUY" hits
# regardless of log.conf settings.
FORBIDDEN_PORTS="135 137 139"
  • Keelan PING paketid:
# Drop all ping packets?
# Set to 1 for yes, 0 for no. Default is no.
BLOCK_PINGS=1
  • Keelan ebaturvalised paketid:
# What to do with 'probably malicious' packets
#SUSPECT="REJECT"
SUSPECT="DROP"
  • Keelan vale liikluse:
# What to do with obviously invalid traffic
# This is also the action for FORBIDDEN_PORTS
KNOWN_BAD="REJECT"
  • Keelan portide skännimise:
# What to do with port scans
#PORT_SCAN="REJECT"
PORT_SCAN="DROP"


  • Tulemüüri automaatseks käivitamiseks ava järgnev fail ning muuda seadistust:
nano /etc/default/ipkungfu

#IPKFSTART=0

IPKFSTART=1


Reeglite vaatamine: [8]

  • You can check ipkungfu with the following:
$ ipkungfu -c
  • You can list all of ipkungfu rules with the following:
$ ipkungfu -l
  • You can test ipkungfu with the following:
$ ipkungfu -t
  • List all iptables rules with the following:
$ iptables -L -n

Parameetrid

Võimalused:[9] 

      -c  (or  --check)
                  Check whether ipkungfu is loaded, and  report  any  command
                  line options it may have been loaded with.

      -t  (or  --test)
                  Runs  a configuration test, and displays the results.  Note
                  that this  does  not  test  or  display  all  configuration
                  options.   This  gives  you  an  opportunity to verify that
                  major configuration options are correct before putting them
                  into action.

      -d  (or  --disable)
                  Disables  the  firewall.   It  is important to know exactly
                  what this option does.  All traffic is allowed in and  out,
                  and  in  the  case  of  a  gateway,  all  NATed  traffic is
                  forwarded  (the  option  retains  your  connection  sharing
                  options).    Custom   rules   are   not   implemented,  and
                  deny_hosts.conf is ignored.

      -f  (or  --flush)
                  Disables the firewall COMPLETELY.  All rules  are  flushed,
                  all  chains  are  removed.  Any port forwarding or internet
                  connection sharing will cease to work.

      -h  (or  --help)
                  Displays brief usage information and exits.

      -v  (or  --version)
                  Displays version information and exits.

      --quiet     Runs ipkungfu with no standard output

      --panic     Drops  ALL  traffic  in  all  directions  on  all   network
                  interfaces.   You  should  probably  never use this option.
                  The --panic option is  available  for  the  highly  unusual
                  situation where you know that an attack is underway but you
                  know of no other way to stop it.

      --failsafe  If ipkungfu  fails,  --failsafe  will  cause  all  firewall
                  policies  to revert to ACCEPT.  This is useful when working
                  with ipkungfu remotely, to prevent loss  of  remote  access
                  due to firewall failure.

      --no-caching
                  Disables rules caching feature.
  • Konfiguratsioonifailide asukohad [10]
    • /etc/ipkungfu/ipkungfu.conf
    • /etc/ipkungfu/advanced.conf
    • /etc/ipkungfu/accept_hosts.conf
    • /etc/ipkungfu/deny_hosts.conf
    • /etc/ipkungfu/custom.conf
    • /etc/ipkungfu/log.conf
    • /etc/ipkungfu/redirect.conf
    • /etc/ipkungfu/services.conf
    • /usr/sbin/ipkungfu
    • /usr/share/doc/ipkungfu/AUTHORS
    • /usr/share/doc/ipkungfu/README
    • /usr/share/doc/ipkungfu/FAQ
    • /usr/share/doc/ipkungfu/ChangeLog
    • /usr/share/doc/ipkungfu/COPYING

Mõned näited kasutamise kohta

Kokkuvõte

Kasutatud kirjandus

Koostas

Heiko Niidas AK-31, 2015

Retrieved from "https://wiki.itcollege.ee/index.php?title=Ipkungfu_Tulemüür&oldid=88473"