Tecnologia da Informação - TI : Proxy Server

Squid + SquidGuard

2014/09/30

	Configure Squid + SquidGuard to set contents filtering.
[1]	Install SquidGuard.

# install from EPEL

[root@prox ~]#

yum --enablerepo=epel -y install squidGuard

[root@prox ~]#

mv /etc/squid/squidGuard.conf /etc/squid/squidGuard.conf.bk

[root@prox ~]#

vi /etc/squid/squidGuard.conf

# create new

dbhome /var/lib/squidGuard/db
logdir /var/log/squidGuard

# define 'deny' category

dest deny {

# define prohibited domain list in 'deny' category

domainlist deny/domains

# define prohibited URL list in 'deny' category

urllist deny/urls
}

acl {
default {

# permit all except 'deny' category

pass !deny all

# the redirected URL if matches 'deny'

redirect http://www.server.world/error.html
}
}

[root@prox ~]#

mkdir -p /var/lib/squidGuard/db/deny

[root@prox ~]#

vi /var/lib/squidGuard/db/deny/domains

# write domains you'd like to prohibit to access

yahoo.co.jp
example.com

[root@prox ~]#

vi /var/lib/squidGuard/db/deny/urls

# write URLs you'd like to prohibit to access

www.yahoo.co.jp/deny/
www.example.com/

[root@prox ~]#

squidGuard -C all

[root@prox ~]#

chown -R squid. /var/lib/squidGuard/db/deny

[root@prox ~]#

vi /etc/squid/squid.conf

# add follows to the end

url_rewrite_program /usr/bin/squidGuard

[root@prox ~]#

systemctl restart squid

[2]	Try to access to the URL you set as prohibited domains in [1].

Squid + SquidClamav

2015/06/03

	Install SquidClamav and Configure Proxy Server to scan downloaded files to protect from virus.
[1]	Install Clamav first, refer to here.
[2]	Install Clamav Server.

# install from EPEL

[root@prox ~]#

yum --enablerepo=epel -y install clamav-server clamav-server-systemd

[root@prox ~]#

cp /usr/share/doc/clamav-server*/clamd.conf /etc/clamd.d/squid.conf

[root@prox ~]#

vi /etc/clamd.d/squid.conf

# line 8: comment out

Example

# line 14: uncomment and change

LogFile

/var/log/clamd.squid

# line 66: uncomment and change

PidFile

/var/run/clamd.squid/clamd.pid

# line 70: uncomment

TemporaryDirectory /var/tmp

# line 85: uncomment and change

LocalSocket

/var/run/clamd.squid/clamd.sock

# line 101: uncomment

TCPSocket 3310

# line 195: change

User

squidclamav

[root@prox ~]#

useradd -M -d /var/tmp -s /sbin/nologin squidclamav

[root@prox ~]#

mkdir /var/run/clamd.squid

[root@prox ~]#

chown squidclamav. /var/run/clamd.squid

[root@prox ~]#

cp /usr/share/doc/clamav-server*/clamd.sysconfig /etc/sysconfig/clamd.squid

[root@prox ~]#

vi /etc/sysconfig/clamd.squid

# line 1,2: uncomment and change

CLAMD_CONFIGFILE=/etc/clamd.d/

squid.conf

CLAMD_SOCKET=/var/run/

clamd.squid

/clamd.sock

[root@prox ~]#

vi /etc/tmpfiles.d/clamd.squid.conf

# create new

d /var/run/clamd.squid 0755 squidclamav squidclamav -

[root@prox ~]#

vi /usr/lib/systemd/system/clamd@.service

# add follows to the end

[Install]
WantedBy=multi-user.target

[root@prox ~]#

touch /var/log/clamd.squid

[root@prox ~]#

chown squidclamav. /var/log/clamd.squid

[root@prox ~]#

chmod 600 /var/log/clamd.squid

[root@prox ~]#

systemctl start clamd@squid

[root@prox ~]#

systemctl enable clamd@squid

[3]	Install c-icap.

[root@prox ~]#

yum -y install gcc make

[root@prox ~]#

curl -L -O http://downloads.sourceforge.net/project/c-icap/c-icap/0.3.x/c_icap-0.3.5.tar.gz

[root@prox ~]#

tar zxvf c_icap-0.3.5.tar.gz

[root@prox ~]#

cd c_icap-0.3.5

[root@prox c_icap-0.3.5]#

./configure

[root@prox c_icap-0.3.5]#

make

[root@prox c_icap-0.3.5]#

make install

[root@prox c_icap-0.3.5]#

[root@prox ~]#

cp /usr/local/etc/c-icap.conf /etc

[root@prox ~]#

vi /etc/c-icap.conf

# line 140: change admin email

ServerAdmin

root@server.world

# line 149: change hostname

ServerName

prox.server.world

# line 517: add

Service squidclamav squidclamav.so

[root@prox ~]#

vi /etc/tmpfiles.d/c-icap.conf

# create new

d /var/run/c-icap 0755 root root -

[root@prox ~]#

vi /usr/lib/systemd/system/c-icap.service

[Unit]
Description=c-icap service
After=network.target

[Service]
Type=forking
PIDFile=/var/run/c-icap/c-icap.pid
ExecStart=/usr/local/bin/c-icap -f /etc/c-icap.conf
KillMode=process

[Install]
WantedBy=multi-user.target

[4]	Install SquidClamav ( Download the latest version of it from the following link ). http://sourceforge.net/projects/squidclamav/files/squidclamav/

[root@prox ~]#

curl -L -O http://downloads.sourceforge.net/project/squidclamav/squidclamav/6.13/squidclamav-6.13.tar.gz

[root@prox ~]#

tar zxvf squidclamav-6.13.tar.gz

[root@prox ~]#

cd squidclamav-6.13

[root@prox squidclamav-6.13]#

./configure --with-c-icap

[root@prox squidclamav-6.13]#

make

[root@prox squidclamav-6.13]#

make install

[root@prox squidclamav-6.13]#

[root@prox ~]#

ln -s /usr/local/etc/squidclamav.conf /etc/squidclamav.conf

[root@prox ~]#

vi /etc/squidclamav.conf

# line 18: change( destination URL for redirect. Create it first )

redirect

http://www.server.world/error.html

# line 27: change( same with clamd )

clamd_local

/var/run/clamd.squid/clamd.sock

[5]	Configure Squid.

[root@prox ~]#

vi /etc/squid/squid.conf

# add follows to the end

icap_enable on
icap_send_client_ip on
icap_send_client_username on
icap_client_username_header X-Authenticated-User
icap_service service_req reqmod_precache bypass=1 icap://127.0.0.1:1344/squidclamav
adaptation_access service_req allow all
icap_service service_resp respmod_precache bypass=1 icap://127.0.0.1:1344/squidclamav
adaptation_access service_resp allow all

[root@prox ~]#

systemctl start c-icap

[root@prox ~]#

systemctl enable c-icap

[root@prox ~]#

systemctl restart squid

[6]	It's OK all. Next, try to access to the site below from a ClientPC with Web browser, http://eicar.org/85-0-Download.html then, click the test Virus "eicar.com" to make sure to redirect the site you configured.

Reverse Proxy Server

2014/09/03

	Configure Squid as a reverse proxy server.
[1]	Configure Squid.

[root@prox ~]#

vi /etc/squid/squid.conf

# 54: add ( allow all http access )

http_access allow all

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

# line 63: specify backend Web server

http_port

80 accel defaultsite=www.server.world

# line 62: uncomment

# number means ⇒ [disk cache size] [number of directories on top level] [number of directories on 2nd level]

cache_dir ufs /var/spool/squid 100 16 256

# add follows to the end

cache_peer www.server.world parent 80 0 no-query originserver

# memory cache size

cache_mem 256 MB

# define hostname

visible_hostname prox.server.world

[root@prox ~]#

systemctl start squid

[root@prox ~]#

systemctl enable squid

[2]	Change settings of DNS or Routers in your LAN if need to listen HTTP access on Squid, then try to access to Squid Reverse Proxy Server from a ClientPC with Web browser like follows.

Use Basic Authentication2014/07/24

Use Basic Authentication

2014/07/24

	Set Basic Authentication and limit squid for users to require authentication.
[1]	Install a package which includes htpasswd.

[root@prox ~]#

yum -y install httpd-tools

[2]	Configure Squid to set Basic Auth.

[root@prox ~]#

vi /etc/squid/squid.conf

acl CONNECT method CONNECT

# line 26: add follows for Basic Auth

auth_param basic program /usr/lib64/squid/basic_ncsa_auth /etc/squid/.htpasswd
auth_param basic children 5
auth_param basic realm Squid Basic Authentication
auth_param basic credentialsttl 5 hours
acl password proxy_auth REQUIRED
http_access allow password

# add a user : create a new file with "-c" ( add the "-c" option only for the initial registration )

[root@prox ~]#

htpasswd -c /etc/squid/.htpasswd cent

New password:

# set password

Re-type new password:

# confirm

Adding password for user cent

[root@prox ~]#

systemctl restart squid

Configure Proxy Client : CentOS

[3]	Configure CentOS Proxy Client for Basic Auth.

[root@client ~]#

vi /etc/profile

# add follows to the end

# username:password@proxyserver:port

MY_PROXY_URL="http://cent:password@prox.server.world:8080/"

HTTP_PROXY=$MY_PROXY_URL
HTTPS_PROXY=$MY_PROXY_URL
FTP_PROXY=$MY_PROXY_URL
http_proxy=$MY_PROXY_URL
https_proxy=$MY_PROXY_URL
ftp_proxy=$MY_PROXY_URL

export HTTP_PROXY HTTPS_PROXY FTP_PROXY http_proxy https_proxy ftp_proxy

[root@client ~]#

source /etc/profile

# it's OK all, but it's possible to set proxy settings for each application like follows.

# for yum

[root@client ~]#

vi /etc/yum.conf

# add follows to the end

proxy=http://prox.server.world:8080/
proxy_username=cent
proxy_password=password

# for wget

[root@client ~]#

vi /etc/wgetrc

# add follows to the end

http_proxy = http://prox.server.world:8080/
https_proxy = http://prox.server.world:8080/
ftp_proxy = http://prox.server.world:8080/
proxy_user = cent
proxy_passwd = password

Configure Proxy Client : Windows

[4]	For Windows Clients, none of specific settings, but when access to a web, proxy server requires authentication like follows, then input username and password.

Proxy Client : CentOS

2014/07/21

	Configure Proxy Client to connect to the Proxy server.
[1]	Configure proxy settings like follows on CentOS Client.

[root@client ~]#

vi /etc/profile

# add follows to the end (set proxy settings to the environment variables)

MY_PROXY_URL="http://prox.server.world:8080/"

HTTP_PROXY=$MY_PROXY_URL
HTTPS_PROXY=$MY_PROXY_URL
FTP_PROXY=$MY_PROXY_URL
http_proxy=$MY_PROXY_URL
https_proxy=$MY_PROXY_URL
ftp_proxy=$MY_PROXY_URL

export HTTP_PROXY HTTPS_PROXY FTP_PROXY http_proxy https_proxy ftp_proxy

[root@client ~]#

source /etc/profile

# it's OK all, but it's possible to set proxy settings for each application like follows.

# for yum

[root@client ~]#

vi /etc/yum.conf

# add follows to the end

proxy=http://prox.server.world:8080/

# for wget

[root@client ~]#

vi /etc/wgetrc

# add follows to the end

http_proxy = http://prox.server.world:8080/
https_proxy = http://prox.server.world:8080/
ftp_proxy = http://prox.server.world:8080/

Proxy Client : Windows

	Configure proxy settings like follows on Windows Client.
[2]	For exmaple on Firefox, Open [Tool] - [Option] and move to [Detail] - [Network] tab.

[3]	Check a box "Configure Proxy manually" and input your server's hostname or IP address. It's OK, it's possible to access to the web via proxy server.

Install Squid

2014/07/21

	Install Squid to configure Proxy server.
[1]	This is common forward proxy settings.

[root@prox ~]#

yum -y install squid

[root@prox ~]#

vi /etc/squid/squid.conf

acl CONNECT method CONNECT

# line 26: add ( define new ACL )

acl lan src 10.0.0.0/24

http_access allow localhost

# line 54: add ( allow defined ACL above )

http_access allow lan

# line 59: change

http_port

8080

# add follows to the end

request_header_access Referer deny all
request_header_access X-Forwarded-For deny all
request_header_access Via deny all
request_header_access Cache-Control deny all

# specify hostname

visible_hostname prox.server.world

# not display IP address

forwarded_for off

[root@prox ~]#

systemctl start squid

[root@prox ~]#

systemctl enable squid

Tecnologia da Informação - TI

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segunda-feira, 25 de abril de 2016

Squid + SquidGuard

Squid + SquidClamav

Reverse Proxy Server

Use Basic Authentication2014/07/24

Proxy Client : CentOS

Install Squid

Console Sony Playstation 5 Edição Slim Disk 1tb Branco + Controle Sem Fio Dualsense Ps5 Branco