(c) Squid Proxy authentication in a transparent mode Therefore, I had quickly reopen port 443 (router firewall) for all my LAN computers and problem was solved. You might be able to successfully achive this, but not without breaking the encryption and certification that is the point behind SSL“. You cannot redirect port 443, from debian mailing list, “ Long answer: SSL is specifically designed to prevent “man in the middle” attacks, and setting up squid in such a way would be the same as such a “man in the middle” attack. So all ports including 443 (https/ssl) request denied. I had block out all connection request from our router settings except for our proxy (192.168.1.1) server. Please note that modprobe command is already added to a shell script (above). Just type the following modprobe command and press the Enter key and voila! I had loaded the ip_nat_ftp kernel module. Related: How to find out top directories and files (disk space) usage in Linux Problems and solutionsĪll Desktop client FTP session request ended with an error: Illegal PORT command. You can use the df command or du command to find about Linux disk space usage. See linux log files tutorial that explains what are logs and where are log files are stored in the Linux system for more info. Now if somebody accessing a website through browser, squid will log information. For instance:Ībove command will monitor all incoming request and log them to /var/log/squid/access_log file. See access log file /var/log/squid/access.log using the tail command or more command or less command. How do I test my squid proxy is working correctly? You do not have to setup up individual browsers to work with proxies. Point all desktop clients to your eth1 IP address (192.168.2.1) as Router/Gateway (use DHCP to distribute this information). # chkconfig squid on Desktop / Client computer configuration Start or restart or reload the squid server. Execute script so that system will act as a router and forward the ports:Īlso, check all our complete firewall tutorials for Alpine Linux Awall, CentOS 8, OpenSUSE, RHEL 8, Ubuntu Linux version 16.04 LTS/ 18.04 LTS/ 20.04 LTS, and 22.04 LTS. Iptables -t nat -A PREROUTING -i $INTERNET -p tcp -dport 80 -j REDIRECT -to -port $SQUID_PORT Iptables -t nat -A PREROUTING -i $LAN_IN -p tcp -dport 80 -j DNAT -to $SQUID_SERVER : $SQUID_PORT # DNAT port 80 request comming from LAN systems to squid 3128 ($SQUID_PORT) aka transparent proxy Iptables -append FORWARD -in -interface $LAN_IN -j ACCEPT Iptables -table nat -append POSTROUTING -out -interface $INTERNET -j MASQUERADE # set this system as a router for Rest of LAN Iptables -A INPUT -i $INTERNET - m state -state ESTABLISHED ,RELATED -j ACCEPT # Load IPTABLES modules for NAT and IP conntrack support Script first configure Linux system as router and forwards all http request to port 3128 (Download the fw.proxy shell script): # iptables -t nat -A PREROUTING -i eth0 -p tcp -dport 80 -j REDIRECT -to-port 3128 Next, I had added following rules to forward all http requests (coming to port 80) to the Squid server port 3128 using the iptables command # iptables -t nat -A PREROUTING -i eth1 -p tcp -dport 80 -j DNAT -to 192.168.1.1:3128 Here is the complete listing of nf for your reference (grep will remove all comments and sed will remove all empty lines, thanks to David Klein for quick hint ): http_access allow lan: - same as above.http_access allow localhost: Squid access to LAN and localhost ACL only.acl lan src 192.168.1.1 192.168.2.0/24: Access control list, only allow LAN computers to use squid.httpd_accel_uses_host_header on: Header is turned on which is the hostname from the URL.httpd_accel_with_proxy on: Squid act as both a local httpd accelerator and as a proxy.httpd_accel_port 80: 80 is port you want to act as a proxy.httpd_accel_host virtual: Squid as an httpd accelerator.Modify or add following squid directives: I am going to configure the proxy server by adding following directives. Step #3: Run scripts and start squid serviceįirst, Squid server installed (use the up2date command to install squid proxy server).b)ğorward all http requests to 3128 (DNAT).Step #1 : Squid configuration so that it will act as a transparent proxy.I left this page up and running for historical reasons. Why? Because HTTPS is designed to prevent “man in the middle” attacks, setting up squid in such for HTTPS is a bad idea because the SQUID will turn into a “man in the middle” attack vector. These days, setting up squid as a transparent proxy makes no sense because of HTTPS. WARNING! This page was initially created in the 2000s when HTTPS was rare.
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