Instalasi Squid Proxy Server di Linux CentOS 6.0

Bagi saya materi kali ini adalah materi yang paling asyik dan menyenangkan.Kenapa itu yang saya katakan..??? jawab saya,karena materi kali ini adalah Instalasi Squid Proxy server di Linux CentOS 6.0 ( baru dasar Proxy,bukan ProxyGuard/ProxyLusca :p ) yang bisa memonitoring aktifitas yang dilihat oleh Client dan memblocked sistus yang tidak di inginkan.sebenarnya masih banyak fungsi-fungsi dari Proxy ini,tetapi pengetahuan saya baru sampai di Install squid Proxy server yang akan saya bahas ini.

Baik,langsung saja Langkah-langkah di bawah ini :

1. Install Squid dan Konfigurasi Squid.conf

Spoiler :

#yum -y install squid
#nano /etc/squid/squid.conf
=========================contoh seperti bawah========================

#
# Recommended minimum configuration:
#
acl manager proto cache_object
acl localhost src 127.0.0.1/32 ::1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1
acl sharing-linux.blogspot.com src Ip_address_eth1_anda/24

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 10.0.0.0/8     # RFC1918 possible internal network
acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl localnet src fc00::/7       # RFC 4193 local private network range
acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
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

#
# Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access deny manager

# Deny requests to certain unsafe ports
http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#

# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost
http_access allow sharing-linux.blogspot.com
http_access deny all

# And finally deny all other access to this proxy
http_access deny all

# Squid normally listens to port 3128
http_port 3128 transparent

# We recommend you to use at least the following line.
hierarchy_stoplist cgi-bin ?

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 100 16 256

# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid

# Add any of your own refresh_pattern entries above these.
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320
=========================contoh seperti diatas=======================
Ket:
- acl sharing-linux.blogspot.com src Ip_address_eth1_anda/24
   adalah Ip address eth1 anda.
- http_access allow sharing-linux.blogspot.com  http_access deny all
   bisa anda ubah sharing-linux.blogspot.com anda
- http_port 3128 transparent
  anda tambahkan transparent di akhir baris http_port 3128

2. Aktifkan Iptables 3128 port dan restart squid

Spoiler :

#iptables -t nat -A PREROUTING -p tcp -s 50.50.5.0/24 --dport 80 -j REDIRECT --to-port 3128 
#nano /etc/rc.local

salin baris di bawah ini di bawah baris => # want to do the full Sys V style init stuff.

 iptables -t nat -A PREROUTING -p tcp -s 12.12.6.0/24 --dport 80 -j REDIRECT --to-port 3128

#service iptables restart

#service squid restart
#tail -f /var/log/squid/access.log
    coba browsing di browser dan lihat apa yang akan terjadi !

3. Jika anda ingin memblocked situs website yang dinginkan perhatikan di bawah ini :

Spoiler :

#cd /etc/squid
#nano blokirwebsite
    ---------------------isi website yang akan di blokir-----------------
       sharing-linux.blogspot.com
    ---------------------isi website yang akan di blokir-----------------

#nano squid.conf
    -------------isikan baris di bawah ini letaknya terserah--------------
       acl badsite1 url_regex /etc/squid/blokirwebsite
       http_access deny badsite1
       http_access deny all
    -------------isikan baris di bawah ini letaknya terserah--------------

#service squid restart

Sampai disini,jika tidak ada error maka squid proxy server anda sudah bierhasil terinstal.di bawah ini adalah contoh pemblokiran website yang sudah saya terangkan di atas.berikut contoh screen shot nya :

Selamat Mencoba :D