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Portsentry

Portsentry. Pendahuluan. Port scan adalah proses scanning berbagai aplikasi servis yang dijalankan di server Internet. Port scan adalah langkah paling awal sebelum sebuah serangan di lakukan. PortSentry http://www.psionic.com/products/portsentry.html. Apa itu Port Sentry. Port : Pelabuhan

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Portsentry

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  1. Portsentry

  2. Pendahuluan • Port scan adalah proses scanning berbagai aplikasi servis yang dijalankan di server Internet. Port scan adalah langkah paling awal sebelum sebuah serangan di lakukan.

  3. PortSentryhttp://www.psionic.com/products/portsentry.html.

  4. Apa itu Port Sentry • Port : Pelabuhan • Sentry : Penjaga • PortSentry adalah sebuah perangkat lunak yang di rancang untuk mendeteksi adanya port scanning & meresponds secara aktif jika ada port scanning secara real time

  5. Platform Port Sentry • FreeBSD • Open BSD • Linux

  6. Keuntungan Port Sentry

  7. Kekurangan Port Sentry • Portsentry bind to port, therefore countermeasure is necessary • Cannot detect spoofing

  8. Dimana Port Sentry Diletakkan • Dibelakang Firewall • Dibelakang tiap host yang dilindungi

  9. Fiture PortSentry • Mendeteksi scan • Melakukan aksi terhadap host yg melakukan pelanggaran • Mengemail admin system bila di integrasikan dengan Logcheck/LogSentry

  10. Jenis-Jenis Scan • Connect scans - • SYN Scans - . • FIN Scans - • NULL Scans - • XMAS Scans - . • FULL-XMAS Scan - • UDP Scan

  11. Aksi yang dilakukan Port Sentry • Stealth setting ???? • Melogging pelanggaran akses di /var/log/messages • Menambahkan entry untuk penyerang di /etc/hosts.deny • Menambahkan non-permanent route dari penyerang ke "black-hole" • Mengeblok akses ke sistem

  12. File Konfigurasi PortSentry • file /etc/portsentry/portsentry.conf • file /etc/portsentry.modes • file /etc/portsentry/portsentry.ignore

  13. Menjalankan portsentry • /usr/sbin/portsentry • /etc/rc.d/init.d/portsentry start • portsentry -udp • portsentry -tcp • portsentry -audp • portsentry -sudp • portsentry -atcp • portsentry -stcp

  14. Konfigurasi Port Sentry • Un-comment these if you are really anal: #TCP_PORTS="1,7,9,11,15,70,79,80,109,110,111,119,138,139,143,512,513,514,515,540,635,1080,1524,2000,2001,[..] #UDP_PORTS="1,7,9,66,67,68,69,111,137,138,161,162,474,513,517,518,635,640,641,666,700,2049,31335,27444,34555,[..] • # # Use these if you just want to be aware: TCP_PORTS="1,11,15,79,111,119,143,540,635,1080,1524,2000,5742,6667,12345,12346,20034,27665,31337,32771,32772,[..] UDP_PORTS="1,7,9,69,161,162,513,635,640,641,700,37444,34555,31335,32770,32771,32772,32773,32774,31337,54321“ • # # Use these for just bare-bones #TCP_PORTS="1,11,15,110,111,143,540,635,1080,1524,2000,12345,12346,20034,32771,32772,32773,32774,49724,54320" #UDP_PORTS="1,7,9,69,161,162,513,640,700,32770,32771,32772,32773,32774,31337,54321"

  15. KILL_ROUTE="/usr/local/sbin/iptables -I INPUT -s $TARGET$ -j DROP“ • KILL_HOSTS_DENY="ALL: $TARGET$ # Portsentry blocked"

  16. Daftar Log Serangan • /etc/hosts.deny – • /etc/portsentry/portsentry.blocked.atcp – • /etc/portsentry/portsentry.blocked.audp – • /etc/portsentry/portsentry.history – .

  17. Output PortSentry • Sep 19 01:50:19 striker portsentry[129]: attackalert: \ Host 192.168.0.1 has been blocked via dropped route using command: \ "/sbin/ipfw add 1 deny all from 192.168.0.1:255.255.255.255 to any" • Sep 19 01:50:19 striker portsentry[129]: attackalert: \ Connect from host: 192.168.0.1/192.168.0.1 to TCP port: 9 Sep 19 01:50:19 striker portsentry[129]: attackalert: \ Host: 192.168.0.1 is already blocked. Ignoring

  18. Tool – Tools lain • scanlogd - Attack detection. • InterSect Alliance - Intrusiuon analysis. Identifies malicious or unauthorized access attempts. • snort - Instead of monitoring a single server with portsentry, snort monitors the network, performing real-time traffic analysis and packet logging on IP networks for the detection of an attack or probe.

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