How to install Squid on Centos 6.6 as an elite proxy

Hello again, now i want to share about squid proxy, before we start let's knowing squid by definition first, Squid is a caching and forwarding web proxy. It has a wide variety of uses, from speeding up a web server by caching repeated requests; to caching web, DNS and other computer network lookups for a group of people sharing network resources; to aiding security by filtering traffic

wikipedia.com

Yesterday "someone" has email me about my instalation method, which is using auto install, he suggest to provide 2 installation method, first is using auto install or "lazy mode" and the second is manual install line by line.

But because squid installation no needed auto installation, because many custumize option depend on user necessary, so lazy mode will not provided this time. Let's start

Step 1 - Installing Squid (as a base and must do)

yum -y install squid

when it's done, type below

vi /etc/ squid/squid.conf

This is the master configuration file for squid, you can costumized squid here, but for minimum requirement of squid, the default setting is work, it's what everybody said, including my friend.

I can't get squid start for first time even squid is running

[root@centos6 ~]# service squid start
Starting squid: ................                           [  OK  ]

But when i check using proxyfier this what i got, if you don't know what is proxifier, click this link (http://www.angelimus.com/2015/07/proxy-load-balancing.html)

For information, i'm using VPS from Evoburst.com with centos 6.6 64Bit. By default, squid proxy run in port 3128.
So if we see error information above picture, it says

Could not connect to 104.xxx.xxx.19:3128

My guess is there are something wrong with port 3128, now try change the port by editing /etc/squid/squid.conf

vi /etc/squid/squid.conf

and find http_port 3128 and change it to http_port 5678
now let's save it by press ESC on keyboard and type :wq

service squid restart

let's go to proxifier again and check it.

Now we are allowed to use the port, but still not pass, through the internet. If we try using browser, using this port, it will show like this

That's good, why i said it's good? it because squid has been detected, and we can know for sure our squid is running.
Picture above means there are something wrong in /etc/squid/squid.conf actually its not wrong but we need a little costumize in our configuration. Now open your squid.conf by type :

vi /etc/squid/squid.conf

let see at the top of your file you will see similar like below (i will copy paste it and explain it)

#
# 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

# 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

What is acl? acl is Access List, so all user that want to use squid proxy must be listed here.
We take example at Line 11, see below

acl localnet src 10.0.0.0/8
-- it read like this, Access List with group localnet with source 10.0.0.0/8

Still confuse? i bet you will, don't worry.
1. 10.0.0.0/8 This is CIDR (Classless Inter-Domain Routing) Identification, it present ip address within range 10.0.0.0 - 10.255.255.255
2. Localnet this is group identifier, so we can allow which group can use proxy using rule.

So, from above acl we see :
10.0.0.0/8 Range = 10.0.0.0 - 10.255.255.255
172.16.0.0/12 Range = 172.16.0.0 - 172.31.255.255
192.168.0.0/16 Range = 192.168.0.0 - 192.168.255.255

Scrool down your squid.conf you will find like this :

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

it will deny access to proxy server if you ip is other than listed above by, since my ip is 104.xxx.xxx.19, it will not allowed.

In step 2, Choose between 2.1 or 2.2 or 2.3 depend on your necessary.

Step 2.1 - How to Allowed All IP to using Proxy Server, make it Public
So, if you want to allow all user ip address in the world to use your proxy server, edit your squid-conf, and find :

http_access deny all 

change it to http_access allow all

save it, and restart your squid by type

service squid restart

Now squid allready connected and running, it accept all ip address without limitation.

Step 2.2 - How to Make squid Personally (Private Use Only)
Edit your squid.conf and add below

acl angelimus src 104.xxx.xxx.19/32

Scroll down, find like below

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

and type http_access allow angelimus

and make sure it block all ip other than listed, by find

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

make sure it is http_access deny all

save squid.conf and restart squid

Step 2.3 - How make squid public with user authenticated system
This step will explain how to create public squid proxy with user authentication system, so user who want to use proxy must be registered first in order to use proxy service.

So before user using proxy, it required authentication, see above image.
Let's start with editing your squid.conf (/etc/squid/squid.conf)
goto at very top of file and copy paste below code :

auth_param basic program /usr/lib64/squid/ncsa_auth /etc/squid/passwd
auth_param basic children 2
auth_param basic realm Angelimus Proxy Server
auth_param basic credentialsttl 24 hours
auth_param basic casesensitive off
acl proxusers proxy_auth REQUIRED
http_access deny !proxusers
http_access allow proxusers

for centos 6 64Bit auth_param basic program /usr/lib64/squid/ncsa_auth
for centos 6 32Bit auth_param basic program /usr/lib/squid/ncsa_auth

save squid.conf
Now we will create user and password file for squid

touch /etc/squid/passwd

set file owner to squid

chown root.squid /etc/squid/passwd

set permission for file

chmod 640 /etc/squid/passwd

Now lets create user for squid with name user001

htpasswd /etc/squid/passwd user001

[root@centos6 ~]# htpasswd /etc/squid/passwd user001
New password: <password is not visible, after type password, press enter>
Re-type new password: <retype password>
Adding password for user user001

now restart squid by type

service squid restart

It's done, try open Mozilla Firefox, set the proxy, and try open http://www.angelimus.com

Now, try open any website, it will show login before you access it.

Step 3 - Create Elite Proxy
Now lets create elite proxy, open your squid.conf, and add below code at the bottom of file.

tcp_outgoing_address 104.xxx.xxx.19 all
104.xxx.xxx.19 >> replace it with your server ip

forwarded_for off
request_header_access Allow allow all
request_header_access Authorization allow all
request_header_access WWW-Authenticate allow all
request_header_access Proxy-Authorization allow all
request_header_access Proxy-Authenticate allow all
request_header_access Cache-Control allow all
request_header_access Content-Encoding allow all
request_header_access Content-Length allow all
request_header_access Content-Type allow all
request_header_access Date allow all
request_header_access Expires allow all
request_header_access Host allow all
request_header_access If-Modified-Since allow all
request_header_access Last-Modified allow all
request_header_access Location allow all
request_header_access Pragma allow all
request_header_access Accept allow all
request_header_access Accept-Charset allow all
request_header_access Accept-Encoding allow all
request_header_access Accept-Language allow all
request_header_access Content-Language allow all
request_header_access Mime-Version allow all
request_header_access Retry-After allow all
request_header_access Title allow all
request_header_access Connection allow all
request_header_access Proxy-Connection allow all
request_header_access User-Agent allow all
request_header_access Cookie allow all
request_header_access All deny all

NOTE : It's occur to Step 1, Step 2, and Step 3 above.. IMPORTANT!!!
if you can't connect to https, like facebook.com or whatismyip.com or google.com, or another site, do this step :
1. Edit your squid.conf (vi /etc/squid/squid.conf)
2. Find acl SSL_ports port 443, add below that code >> acl SSL_ports port 80

so it will look like this (see below)
acl SSL_ports port 443
acl SSL_ports port 80
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https

Save and restart squid.
Now you already have personal proxy server with ELITE PROXY.
Try go to angelimus.com and see what is your ip? It will change into your VPS IP address.

Test my proxy using Gather Proxy 8.5 Free Edition

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VPS can't connect to Internet "Unknown Host"

Hello again, today i want to show you to fix some little problem that may occur on your VPS, i experience it today, while i installing package from yum or in other word officially apps for Centos 6 64Bit, everything is fine, i can host my website using wordpress, connect SSH, surfing with VPN, etc, no problem at all, this time i using VPS provided by EthernetServer.com for review purpose with Intel(R) Xeon(R) CPU E3-1240 v3 @ 3.40GHz as CPU - 2GB Ram - 100GB SSD - and 2TB Bandwidth (check limited offer here).

And, i start reboot my VPS, nothing strange happened or maybe i didn't realized it, i try run VNC and connect to KDE from windows, and tada...

"The connection was refused by the host computer"

And i try start my vncserver from terminal, i type vncserver from terminal, it won't start.

I think my VPS can't connect to Internet, so to make sure, not guessing, i try simple thing, i type :

ping www.google.com

"unknown host"

Yes indeed, there are conflict in network, so it block each other, maybe when you installing some package, you don't realized you already create that conflict.

Fisrt to make sure again i type :

chkconfig --list | grep -Ei 'network|wpa'

network         0:off   1:off   2:on    3:on    4:on    5:on    6:off
NetworkManager  0:off   1:off   2:on    3:on    4:on    5:on    6:off
wpa_supplicant  0:off   1:off   2:off   3:off   4:off   5:off   6:off

That's the problem, 2 network manage in one system, so try remove NetworkManager, type :

yum remove NetworkManager

Then restart or reboot your VPS, try ping first.

ping www.google.com

64 bytes from yyz08s14-in-f16.1e100.net (74.125.226.144): icmp_seq=1 ttl=54 time=2.37 ms
64 bytes from yyz08s14-in-f16.1e100.net (74.125.226.144): icmp_seq=2 ttl=54 time=2.33 ms

it success, then i try connect to KDE using VNC in windows 7

"The connection was refused by the host computer"

this occur because vncserver is not started, try start it by type :

vncserver

New 'server.angelimus.com:1 (root)' desktop is server.angelimus.com:1

Starting applications specified in /root/.vnc/xstartup
Log file is /root/.vnc/server.angelimus.com:1.log

IT's DONE, PROBLEM SOLVED, but what cause that matter? so i reinstall my VPS, and try install package one by one, after installing i do reboot, and then ping, no problem so far, until i install KDE (Tutorial INSTALL KDE click here), after i reboot, i can't ping Google.

So i assume, that source of problem is from KDE, but from previous tutorial that i using another VPS Host, this kind of problem is not exist. Maybe i just unlucky or something passed by me.

Hope my experience can help you solve problem like this.

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