Squid

Installation

# yum -y install squid

Configuration

Réseaux source

Commençons par spécifier le réseaux duquel parviennent les requêtes HTTP.

Pour cela, remplacer les lignes

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

un peu trop permissive par

acl localnet src 192.168.1.0/24 # RFC1918 possible internal network

Activation du cache

Pour que le proxy puisse mémoriser le contenu statique des requêtes et ainsi accélérer le trafic, il faut activer le cache.

Pour cela, repérez la ligne

# cache_dir ufs /var/spool/squid 100 16 256

et remplacer la par

cache_dir ufs /var/spool/squid 100 16 256
cache_mem 100 MB

Mode proxy de base

Dans ce mode, il est obligatoire de configurer les navigateurs des clients pour qu'il passent par le proxy. Il n'y a rien d'autre a faire qu'ouvrir le port 3128 du pare-feu et configurer le navigateur en conséquence.

# iptables -I INPUT 2 -p tcp --dport 3128 -j ACCEPT

Mode proxy transparent

#
# 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 192.168.1.0/24 # 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

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

# Squid normally listens to port 3128
#http_port 3128 intercept
http_port 3128 intercept 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
cache_mem 100 MB

# 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

visible_hostname hades

shutdown_lifetime 2 seconds
cache_effective_user squid
cache_effective_group squid

Chargeur de démarrage

# chkconfig squid on