On Tue, Sep 05, 2006 at 07:34:13AM +0700, Agi Subagio wrote: > lihat website ini > http://help.yahoo.com/help/us/messenger/win/signin/signin-02.html > lalu blok port dan server2-nya melalui iptables. > dijamin gak akan bisa konek YM lagi.
Alternatif lain, squid diset sbg proxy transparent, kemudian edit squid.conf dan tambahkan baris2 yg ditandai dg "##" atau yg mengandung kata "BROWSER" hasilnya seperti ini: acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl localnet1 src 192.168.0.0/255.255.255.0 acl to_localhost dst 127.0.0.0/8 acl SSL_ports port 443 563 acl Safe_ports port 80 # http acl Safe_ports port 88 # to my local webserver acl Safe_ports port 21 # ftp acl Safe_ports port 443 563 # https, snews acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT ## acl BROWSER req_header User-Agent -i "/usr/local/squid/etc/user-agent" http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localhost http_access deny !BROWSER ## http_access allow localnet1 http_access deny all http_reply_access allow manager http_reply_access deny !BROWSER ## http_reply_access allow all icp_access deny all Buat dulu filenya /usr/local/squid/etc/user-agent. # cd /usr/local/squid/etc/ # touch user-agent # squid -k reconfigure Sekarang kita kudu "mendengarkan" pakai ngrep browser2 default mana saja yg boleh pakai internet selain itu diblok, biasanya muncul access denied. Cari dan install ngrep, kemudian jalankan perintah sbg root: # ngrep -qi user-agent host ip_client_yg_buka_internet Paling enak kita jalankan ngrep di posisi client via putty, kemudian browsing pakai IE atau Mozilla, pasti kena access_denied. Hasil pengamatan via ngrep nanti di masukkan ke file user-agent, contoh pengamatannya kayak ini: Saya pakai IE 6.0.2800. [EMAIL PROTECTED] root]# ngrep -qi user-agent host 192.168.0.114 interface: eth0 (192.168.0.0/255.255.255.0) filter: (ip) and ( host 192.168.0.114 ) match: ser-agent T 192.168.0.114:3123 -> 202.146.5.33:80 [AP] GET /kompas-cetak/0609/07/daerah/ HTTP/1.1..Accept: image/gif, image/x-xbitmap, image/jpeg, i mage/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, appl ication/x-shockwave-flash, */*..Referer: http://www.kompas.co.id/kompas-cetak/0609/07/Sosok/2 935993.htm..Accept-Language: en-us..Accept-Encoding: gzip, deflate..User-Agent: Mozilla/4.0 ( compatible; MSIE 6.0; Windows NT 5.1)..Host: www.kompas.co.id..Connection: Keep-Alive.... User agentnya: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1) Biasanya kalau pakai yahoo messenger, user-agentnya: Mozilla.Compatible/2.0.\(WinNT;.I;.NCC/2.0\) Memang repot sih, kita harus mantau trafik internet dg ngrep mana2 agent browser yg boleh ke internet dan kemudian menuliskan user-agentnya satu demi satu ke file /usr/local/squid/etc/user-agent Nulisnya juga ada aturannya, jadi kayak tadi (yg boleh lewat) ditulis begini: # cat /usr/local/squid/etc/user-agent Mozilla/4.0.\(compatible;.MSIE.6.0;.Windows.NT.5.1\) Selain itu bisa memblok virus2 yg biasa jalan begitu suatu link dibuka. Biasanya kalo kita buka situs2 warez, serial numbers dll. Selamat berjuang ! Salam, ~yudi NB: Topik blok akses via user-agent ini dulu pernah saya lempar ke milis sekitar setahun yl, kira2 april/mei 2005. -- FAQ milis di http://wiki.linux.or.id/FAQ_milis_tanya-jawab Unsubscribe: kirim email ke [EMAIL PROTECTED] Arsip dan info milis selengkapnya di http://linux.or.id/milis
