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Old 03-09-2006, 09:51 PM   #1
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setting up dansguardian, squid and iptables as webfilter!!


I read an article about linux web filtering by using Squid, DansGuardian and IPTables. So, I try to implement it on my single computer. I used Redhat Enterprise Edition 4 AS that already have squid-2.5.STABLE6-3 and iptables-1.2.11-3.1.RHEL4. So, I just need to install dansguardian. I install DG by using rpm. The configuration as below:

Squid Configuration
Add or edit the file on ( /etc/squid/squid.conf )

httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy on
httpd_accel_uses_host_header on
cache_effective_user squid
cache_effective_group squid

On the command prompt type :
groupadd -r squid
useradd -g squid -d /var/spool/squid -s /bin/false -r squid

DansGuardian Configuration

Add or edit the file on ( /etc/dansguardian/dansguardian.conf)

reportinglevel = 3
filterip =
filterport = 8080
proxyip =
proxyport = 3128
daemonuser = 'squid'
daemongroup = 'squid'

Iptables Command
Setting up the transparent proxy using iptables. ( allow the user squid to access both the Internet and the Squid proxy )

iptables -t nat -A OUTPUT -p tcp --dport 80 -m owner --uid-owner squid -j ACCEPT
iptables -t nat -A OUTPUT -p tcp --dport 3128 -m owner --uid-owner squid -j ACCEPT

The next command redirects Internet traffic from all users, other than squid and any exempt users, to the filter on port 8080:

iptables -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT --to-ports 8080
iptables -t nat -A OUTPUT -p tcp --dport 3128 -j REDIRECT --to-ports 8080

iptables-save > /etc/sysconfig/iptables

chkconfig iptables on
service iptables restart

chkconfig squid on
chkconfig dansguardian on

service squid restart
service dansguardian restart

All seems okay except for the command “service dansguardian restart” where my DG stop OK, but start failed!! So I just start it manually using Redhat system setting-service.
After that I try to open the web site but my computer can’t reach the internet!!there’s a prompt pop out saying that “cannot attempt to reach the connection…” a sort like that! I can’t browse the internet at all. My computer can enter the internet like normal again after i disable (stop) iptables. But then I can reach the prohibited site!! Can anyone help me???
Old 03-10-2006, 06:29 PM   #2
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