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	<title>:: Mujie on the Net :: &#187; Keamanan</title>
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	<pubDate>Sat, 13 Feb 2010 14:30:50 +0000</pubDate>
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			<item>
		<title>Mengenal Keamanan Wireless 2.4Ghz</title>
		<link>http://mujie.blog.niwakarya.com/keamanan/2008/08/29/mengenal-keamanan-wireless-24ghz.html</link>
		<comments>http://mujie.blog.niwakarya.com/keamanan/2008/08/29/mengenal-keamanan-wireless-24ghz.html#comments</comments>
		<pubDate>Fri, 29 Aug 2008 15:12:46 +0000</pubDate>
		<dc:creator>mujie</dc:creator>
		
		<category><![CDATA[Keamanan]]></category>

		<category><![CDATA[Jaringan]]></category>

		<guid isPermaLink="false">http://mujie.blog.niwakarya.com/?p=75</guid>
		<description><![CDATA[Mungkin topik ini sudah basi, dan sudah seringkali dibahas dan diulas baik itu di blog, website, forum bahkan milis. Namun, izinkan saya menuliskannya kembali tentang pengetahuan dasar keamanan wireless 2.4Ghz.

Gambar contoh keamanan wireless

Ada bermacam-macam metode keamanan wireless 2.4Ghz, yaitu :

WEP
WAP/WAP2
Radius
Web login based


WEP

WEP (Wired Equivalent Privacy) adalah metode enkripsi wireless 2.4Ghz terlemah. Dimana hanya menggunakan 40-bit [...]]]></description>
			<content:encoded><![CDATA[<p style="text-align: justify">Mungkin topik ini sudah basi, dan sudah seringkali dibahas dan diulas baik itu di blog, website, forum bahkan milis. Namun, izinkan saya menuliskannya kembali tentang pengetahuan dasar keamanan wireless 2.4Ghz.</p>
<p style="text-align: center"><img class="alignnone size-full wp-image-77" src="http://mujie.blog.niwakarya.com/files/2008/08/topologi_wireless1.jpg" alt="" width="480" height="237" /></p>
<p style="text-align: center">Gambar contoh keamanan wireless</p>
<p style="text-align: justify"><span id="more-75"></span></p>
<p style="text-align: justify">Ada bermacam-macam metode keamanan wireless 2.4Ghz, yaitu :</p>
<ul>
<li>WEP</li>
<li>WAP/WAP2</li>
<li>Radius</li>
<li>Web login based</li>
</ul>
<ul>
<li><strong>WEP</strong></li>
</ul>
<p style="text-align: justify;padding-left: 30px">WEP (<em>Wired Equivalent Privacy</em>) adalah metode enkripsi wireless 2.4Ghz terlemah. Dimana hanya menggunakan 40-bit hingga 128-bit, dengan kata lain untuk 40-bit kita menggunakan 10 karakter sebagai kata kunci hexadesimal (0-9, A-F) dan untuk 128-bit sebanyak 26 karakter. Tidak bisa menggunakan symbol-symbol ataupun kombinasinya. WEP terbagi lagi atas : Open System authentication dan Shared Key authentication.</p>
<p style="text-align: justify;padding-left: 30px">
<p style="text-align: justify;padding-left: 30px">
<ul>
<li><strong>WAP/WAP2</strong></li>
</ul>
<p style="text-align: justify;padding-left: 30px">Wi-Fi Alliance tidak lama kemudian juga membuat sebuah protokol enkripsi untuk wireless 2.4Ghz yaitu WPA (<em>Wi-Fi Protected Access</em>) dan disempurnakan dengan WPA2. Dibandingkan WEP, WAP dan WAP2 bisa menggunakan symbol-symbol, maupun  kata kunci membentuk kalimat. Hanya saja, tidak semua perangkat keras wifi dapat menggunakannya karena keterbatasan firmware.</p>
<p style="text-align: justify;padding-left: 30px">
<p style="text-align: justify;padding-left: 30px">
<ul>
<li><strong>Radius</strong></li>
</ul>
<p style="text-align: justify;padding-left: 30px">Radius (<em>Remote Authentication Dial In User Service</em>) yaitu protokol akses terpusat, mulai dari authentication, authorization dan accounting (ototentikasi, otoritas dan pengelolaan akun) atau yang disingkat dengan AAA proses. Pengolaan wireless 2.4Ghz dengan Radius lebih kompleks, karena melibatkan server Radius, username dan password. Data-data disimpan didalam sebuah database atau pun active directory.</p>
<p style="text-align: justify;padding-left: 30px">
<ul>
<li><strong>Web Login Based</strong></li>
</ul>
<p style="text-align: justify;padding-left: 30px">Terakhir, metode ini juga digunakan oleh MikroTik sebagai salah satu fasilitas hotspot login yang bisa diakses ketika terkoneksi. MikroTik akan menampilkan halaman login di web secara otomatis.</p>
<p style="text-align: justify;padding-left: 30px">
<p style="text-align: justify">Untuk selengkapnya silahkan Anda berkunjung ke :</p>
<p style="text-align: justify"><a href="http://en.wikipedia.org/wiki/Wired_Equivalent_Privacy" target="_blank">http://en.wikipedia.org/wiki/Wired_Equivalent_Privacy</a><br />
<a href="http://en.wikipedia.org/wiki/Wi-Fi_Protected_Access" target="_blank">http://en.wikipedia.org/wiki/Wi-Fi_Protected_Access</a><br />
<a href="http://en.wikipedia.org/wiki/RADIUS" target="_blank">http://en.wikipedia.org/wiki/RADIUS</a></p>
<p style="text-align: justify;padding-left: 30px">

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		</item>
		<item>
		<title>Firewalling IP Address dan MAC Address dengan iptables</title>
		<link>http://mujie.blog.niwakarya.com/keamanan/2005/11/26/firewalling-ip-address-dan-mac-address-dengan-iptables.html</link>
		<comments>http://mujie.blog.niwakarya.com/keamanan/2005/11/26/firewalling-ip-address-dan-mac-address-dengan-iptables.html#comments</comments>
		<pubDate>Fri, 25 Nov 2005 23:37:07 +0000</pubDate>
		<dc:creator>mujie</dc:creator>
		
		<category><![CDATA[Keamanan]]></category>

		<category><![CDATA[Jaringan]]></category>

		<category><![CDATA[Linux]]></category>

		<guid isPermaLink="false">http://mujie.blog.palangkaraya.net/2005/11/26/firewalling-ip-address-dan-mac-address-dengan-iptables/</guid>
		<description><![CDATA[Halu rekan-rekan peminat IT sekalian, lama tak jumpa. Kadang kita sebagai administrator suatu jaringan sangat dipusingkan dengan beberapa client &#8220;nakal&#8221; yang suka berganti-ganti IP Address. Padahal sebelumnya suatu IP Address tertentu dari client sudah kita blok aksesnya untuk jam-jam tertentu, atau kita blok untuk mengakses suatu situs tertentu.

Mungkin sedikit yang bisa saya berikan disini adalah, [...]]]></description>
			<content:encoded><![CDATA[<p align="justify">Halu rekan-rekan peminat IT sekalian, lama tak jumpa. Kadang kita sebagai administrator suatu jaringan sangat dipusingkan dengan beberapa client &#8220;nakal&#8221; yang suka berganti-ganti IP Address. Padahal sebelumnya suatu IP Address tertentu dari client sudah kita blok aksesnya untuk jam-jam tertentu, atau kita blok untuk mengakses suatu situs tertentu.</p>
<p align="justify"><span id="more-6"></span></p>
<p align="justify">Mungkin sedikit yang bisa saya berikan disini adalah, bagaimana kita dapat mengatasi &#8220;kenakalan&#8221; client-client tersebut agar tidak bisa mengganti IP Address mereka secara &#8220;enaknya saja&#8221;. Saya harapkan Anda paling tidak sudah tahu apa itu IP Address dan apa itu MAC Address. Dalam melakukan percobaan disini saya menggunakan Linux distro <a title="ClarkConnect Home Edition versi 3.0" href="http://www.clarkconnect.com/">ClarkConnect Home Edition versi 3.0</a> yang dilengkapi dengan <a title="iptables" href="http://www.netfilter.org/">iptables</a> versi 1.2.11. Rekan-rekan dapat menggunakan distro Linux lainnya.Keuntungan dan kerugian :</p>
<ul>
<li>Keuntungan yang didapatkan adalah, kita dapat dengan mudah memonitor &#8220;pergerakan&#8221; client dan melakukan logging untuk administrasi jaringan atau analisa-analisa lain yang diperlukan, karena client tidak dapat melakukan perubahan IP Address.</li>
<li>Kerugian, seandainya saja interface hardware milik client mengalami kerusakan dan melakukan pergantian, kita harus melakukan konfigurasi ulang rules firewall kita berdasarkan MAC Address yang baru. Tapi kerusakan ini sangat jarang terjadi.</li>
</ul>
<p>Ada 2 metode yang saya gunakan disini dan dapat rekan-rekan sekalian pilih salah satunya, yaitu :</p>
<ul>
<li>
<p align="justify">Pertama, apakah kita akan melakukan pendaftaran semua IP Address dan MAC Address client-client kita dan tidak memperkenankan semua client yang terhubung dengan kita tidak dapat berganti-ganti IP Address. Jika IP dan MAC Address tidak terdaftar didalam rules firewall, maka client tidak dapat melakukan koneksi.</p>
</li>
<li>
<p align="justify">Kedua, apakah kita hanya menginginkan IP Address dan MAC Address tertentu saja yang tidak kita inginkan untuk berganti-ganti IP Address. Disini, jika ada IP baru dan dengan MAC Address baru, client tetap dapat melakukan koneksi.</p>
</li>
</ul>

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			<wfw:commentRss>http://mujie.blog.niwakarya.com/keamanan/2005/11/26/firewalling-ip-address-dan-mac-address-dengan-iptables.html/feed</wfw:commentRss>
		</item>
		<item>
		<title>Otomatisasi firewalling IP dan MAC Address dengan iptables</title>
		<link>http://mujie.blog.niwakarya.com/keamanan/2005/11/21/otomatisasi-firewalling-ip-dan-mac-address-dengan-iptables.html</link>
		<comments>http://mujie.blog.niwakarya.com/keamanan/2005/11/21/otomatisasi-firewalling-ip-dan-mac-address-dengan-iptables.html#comments</comments>
		<pubDate>Sun, 20 Nov 2005 23:41:45 +0000</pubDate>
		<dc:creator>mujie</dc:creator>
		
		<category><![CDATA[Keamanan]]></category>

		<category><![CDATA[Jaringan]]></category>

		<category><![CDATA[Linux]]></category>

		<guid isPermaLink="false">http://mujie.blog.palangkaraya.net/2005/11/21/otomatisasi-firewalling-ip-dan-mac-address-dengan-iptables/</guid>
		<description><![CDATA[Berhubung ada pertanyaan menarik dari salah satu member sebuah milis yang saya ikuti, bagaimana jika client kita berjumlah banyak, puluhan atau ratusan. Yang terpenting adalah, kita mempunyai daftar IP Address dan MAC Address client yang terhubung. Dengan menggunakan sedikit baris bash script sederhana, kita dapat membuat otomatisasinya.

Berikut langkah-langkahnya :
1. Buat file bernama rc.iplock didalam directory [...]]]></description>
			<content:encoded><![CDATA[<p>Berhubung ada pertanyaan menarik dari salah satu member sebuah milis yang saya ikuti, bagaimana jika client kita berjumlah banyak, puluhan atau ratusan. Yang terpenting adalah, kita mempunyai daftar IP Address dan MAC Address client yang terhubung. Dengan menggunakan sedikit baris bash script sederhana, kita dapat membuat otomatisasinya.</p>
<p><span id="more-5"></span><br />
Berikut langkah-langkahnya :</p>
<p>1. Buat file bernama rc.iplock didalam directory /etc/rc.d/ dengan isi sebagai berikut :</p>
<p>#!/bin/bash<br />
# Bash script Lock IP Address dan MAC Address<br />
iptables=&#8221;/sbin/iptables&#8221;	#path ke iptables<br />
files=&#8221;/etc/rc.d/list.txt&#8221;	#path ke list IP Address dan MAC Address<br />
device=&#8221;eth1&#8243;			#ethernet devices ke client<br />
lockall=&#8221;yes&#8221;			#yes|no ,yes jika mendaftarkan semua IP &amp; MAC Address<br />
#jika tidak, tulis no.<br />
#yes untuk metode pertama, no untuk metode kedua</p>
<p>if [ $lockall = "yes" ]; then<br />
$iptables -I PREROUTING -t nat -i $device -j DROP<br />
cat $files | while read ip_address mac_address; do<br />
$iptables -I PREROUTING -t nat -i $devices -s $ip_address \<br />
-m mac &#8211;mac-source $mac_address -j ACCEPT<br />
$iptables -I FORWARD -i $device -s ! $ip_address \<br />
-m mac &#8211;mac-source $mac_address -j DROP<br />
$iptables -I PREROUTING -t nat -s ! $ip_address \<br />
-m mac &#8211;mac-source $mac_address -j DROP<br />
done<br />
elif [ $lockall = "no" ]; then<br />
$iptables -I PREROUTING -t nat -i $device -j ACCEPT<br />
cat $files | while read ip_address mac_address; do<br />
$iptables -I FORWARD -i $device -s ! $ip_address \<br />
-m mac &#8211;mac-source $mac_address -j DROP<br />
$iptables -I PREROUTING -t nat -s ! $ip_address \<br />
-m mac &#8211;mac-source $mac_address -j DROP<br />
done<br />
fi</p>
<p>echo &#8220;Locking IP Address and Mac Address&#8230;&#8221;<br />
#end script</p>
<p>2. Buat file bernama list.txt didalam directory /etc/rc.d/ dengan format penulisan sebagai berikut :<br />
&lt;IP Address&gt;	&lt;MAC Address&gt;</p>
<p>Peringatan!! Jangan tambahkan baris apapun atau kalimat apapun selain format diatas!</p>
<p>Contoh isi file /etc/rc.d/list.txt untuk 3 client:</p>
<p>192.168.1.5	00:89:CD:64:01:EF<br />
192.168.1.20	00:90:DD:14:11:CF<br />
192.168.1.14	00:40:EE:21:26:GE</p>
<p>3. Set file rc.iplock agar dapat di eksekusi :</p>
<p>chmod +x /etc/rc.d/rc.iplock</p>
<p>4. Tambahkan didalam file /etc/rc.d/rc.local agar dapat di eksekusi pada saat start up :</p>
<p>/etc/rc.d/rc.iplock</p>
<p>5. Jalankan :</p>
<p>/etc/rc.d/rc.iplock</p>
<p>6. Selesai! Selamat Anda dapat bintang =P</p>

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