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    Question about Firewall rules

    Firewalling
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    • pozolero
      pozolero last edited by

      Hi everyone!  I have an iptables script (Yes, i know pfsense doesn't use iptables) but i think it's a clever script.

      This script was on a debian server with squid in transparent mode, and was for blocking https (443) connections for domains like youtube.com without blocking google.com domain. Both domains use same ip address.

      My question is: Is it possible to achieve something like this firewall rules on pfsense?

      I'll let you the firewall script below

      #! /bin/sh
      # BLOCKING HTTPS CONNECTIONS / PORT 443
      
      echo "Starting Firewall. "
      echo "Applying Firewall Rules .........."
      
      iptables -F
      iptables -X
      iptables -t nat -F
      iptables -t nat -X
      iptables -t nat -Z
      
      #iptables -P INPUT ACCEPT
      #iptables -P OUTPUT ACCEPT
      #iptables -P FORWARD DROP
      
      INTERNET="eth0"
      LAN="eth1"
      IPLAN="172.16.0.0/12"
      RED="172.20.5"
      MOVIL="172.20.10"
      
      echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
      echo 1 > /proc/sys/net/ipv4/ip_forward
      
      iptables -A INPUT -i lo -j ACCEPT	# Localhost
      iptables -A OUTPUT -o lo -j ACCEPT	# Localhost
      #---------------------------------------------------------------------
      iptables -A FORWARD -p tcp --dport 443 -j ACCEPT	# HTTPS
      
      iptables -A INPUT -i $INTERNET -p tcp --dport 20 -j ACCEPT	# FTP
      iptables -A INPUT -i $INTERNET -p tcp --dport 21 -j ACCEPT	# FTP
      
      #iptables -A INPUT -i $INTERNET -p tcp --dport 22 -j ACCEPT	# SSH
      #iptables -A INPUT -i $INTERNET -p tcp --dport 25 -j ACCEPT	# SMTP
      #iptables -A INPUT -i $INTERNET -p tcp --dport 53 -j ACCEPT	# DNS
      #iptables -A INPUT -i $INTERNET -p tcp --dport 80 -j ACCEPT	# WEB
      #iptables -A INPUT -i $INTERNET -p tcp --dport 110 -j ACCEPT	# POP
      #iptables -A INPUT -i $INTERNET -p tcp --dport 143 -j ACCEPT	# IMAP
      #iptables -A INPUT -i $INTERNET -p tcp --dport 1433 -j ACCEPT	# SQL Server
      #iptables -A INPUT -i $INTERNET -p tcp --dport 3306 -j ACCEPT	# MySQL
      
      iptables -A INPUT -p tcp --dport 20 -j ACCEPT		# FTP
      iptables -A INPUT -p tcp --dport 21 -j ACCEPT		# FTP
      iptables -A OUTPUT -p tcp --sport 20 -j ACCEPT		# FTP
      iptables -A OUTPUT -p tcp --sport 21 -j ACCEPT		# FTP
      iptables -A INPUT -p tcp --dport 22 -j ACCEPT		# SSH
      iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT		# SSH
      iptables -A INPUT -p tcp --dport 25 -j ACCEPT		# SMTP
      iptables -A OUTPUT -p tcp --sport 25 -j ACCEPT		# SMTP
      iptables -A INPUT -p tcp --dport 80 -j ACCEPT		# WEB
      iptables -A OUTPUT -p tcp --sport 80 -j ACCEPT		# WEB
      iptables -A INPUT -p tcp --dport 110 -j ACCEPT		# POP MAIL
      iptables -A OUTPUT -p tcp --sport 110 -j ACCEPT		# POP MAIL
      iptables -A INPUT -p tcp --dport 143 -j ACCEPT		# IMAP MAIL
      iptables -A OUTPUT -p tcp --sport 143 -j ACCEPT		# IMAP MAIL
      #iptables -A INPUT -p tcp --dport 1433 -j ACCEPT	# SQL Server
      #iptables -A OUTPUT -p tcp --sport 1433 -j ACCEPT	# SQL Server
      #iptables -A INPUT -p tcp --dport 3306 -j ACCEPT	# MySQL
      #iptables -A OUTPUT -p tcp --sport 3306 -j ACCEPT	# MySQL
      
      iptables -A INPUT -p tcp --dport 7777 -j ACCEPT		# CNPSS
      iptables -A OUTPUT -p tcp --sport 7777 -j ACCEPT	# CNPSS
      
      #-----------------------------------------------------------------------
      iptables -t nat -A PREROUTING -s $IPLAN -p tcp --dport 80 -j DNAT --to 172.20.5.1:3128
      iptables -t nat -A POSTROUTING -s $IPLAN -o $INTERNET -j MASQUERADE
      
      # ACCESS LEVELS FOR UNRESTRICTED IP
      # WEBSITES RESTRICTIONS ARE MADE BY SQUID, FIREWALL ONLY CONTROLS HTTPS ACCESS
      
      # --------------------------------------- FIREWALL LEVELS
      # 1° LEVEL -  NO RESTRICTIONS
      # 2° LEVEL -  ACCESS ONLY  FACEBOOK + TWITTER + YOUTUBE + DROPBOX, BLOCKED PEER-TO-PEER
      # 3° LEVEL - ACCESS ONLY FACEBOOK;  TWITTER, YOUTUBE, DROPBOX, BLOCKED PEER-TO-PEER
      
      iptables -A FORWARD -d 151.101.0.0/16 -j ACCEPT
      iptables -A OUTPUT -p tcp -d 151.101.0.0/16 -j ACCEPT	# Schoology
      iptables -A FORWARD -p tcp -d schoology.com --dport 443 -j ACCEPT
      #iptables -A OUTPUT -p tcp -d www.schoology.com -j ACCEPT	
      #iptables -A OUTPUT -p tcp -d schoology.com -j ACCEPT
      
      # UNRESTRICTED IP ( ACCESS LEVEL 1)
      #-----------------------------------------------------------------------------
      iptables -A FORWARD -s $RED.41 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.42 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.48 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.49 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.55 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.57 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.68 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.69 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.70 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.76 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.129 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.141 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.168 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.170 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.249 -o $INTERNET -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.218 -o $INTERNET -j ACCEPT	# USER
      #----------------------------------------------------------------------------
      # APPLE SERVERS
      #----------------------------
      #iptables -A FORWARD -d 74.125.0.0/16 -j ACCEPT		# Google
      iptables -A FORWARD -s 17.142.160.59 -j ACCEPT
      iptables -A FORWARD -s 17.172.224.47 -j ACCEPT
      iptables -A FORWARD -s 17.178.96.59 -j ACCEPT
      
      iptables -A FORWARD -s $MOVIL.10 -o $INTERNET -j ACCEPT		# CELL PHONE
      iptables -A FORWARD -s $MOVIL.15 -o $INTERNET -j ACCEPT		# CELL PHONE
      iptables -A FORWARD -s $MOVIL.19 -o $INTERNET -j ACCEPT		# CELL PHONE
      iptables -A FORWARD -s $MOVIL.20 -o $INTERNET -j ACCEPT		# CELL PHONE
      iptables -A FORWARD -s $MOVIL.21 -o $INTERNET -j ACCEPT		# CELL PHONE
      iptables -A FORWARD -s $MOVIL.36 -o $INTERNET -j ACCEPT		# CELL PHONE
      iptables -A FORWARD -s $MOVIL.77 -o $INTERNET -j ACCEPT		# CELL PHONE
      iptables -A FORWARD -s $MOVIL.78 -o $INTERNET -j ACCEPT		# CELL PHONE
      iptables -A FORWARD -s $MOVIL.39 -o $INTERNET -j ACCEPT		# CELL PHONE
      iptables -A FORWARD -s $MOVIL.40 -o $INTERNET -j ACCEPT		# CELL PHONE
      iptables -A FORWARD -s $MOVIL.44 -o $INTERNET -j ACCEPT		# CELL PHONE
      iptables -A FORWARD -s $MOVIL.85 -o $INTERNET -j ACCEPT 	        # TABLET
      
      # BLOCKED TORRENT DOWNLOADS
      #----------------------------------------------------------------------------
      iptables -A FORWARD -m string --algo bm --string "BitTorrent" -j DROP
      iptables -A FORWARD -m string --algo bm --string "BitTorrent protocol" -j DROP
      iptables -A FORWARD -m string --algo bm --string "peer_id" -j DROP
      iptables -A FORWARD -m string --algo bm --string ".torrent" -j DROP
      iptables -A FORWARD -m string --algo bm --string "announce.php?passkey=" -j DROP
      iptables -A FORWARD -m string --algo bm --string "torrent" -j DROP
      iptables -A FORWARD -m string --algo bm --string "announce" -j DROP
      iptables -A FORWARD -m string --algo bm --string "info_hash" -j DROP
      
      iptables -A FORWARD -m string --algo bm --string "get_peers" -j DROP
      iptables -A FORWARD -m string --algo bm --string "announce_peer" -j DROP
      iptables -A FORWARD -m string --algo bm --string "find_node" -j DROP
      
      # BLOCKED TORRENT Y P2P
      # BY MODULE ----- apt-get install xtables-addons-common
      # iptables -m ipp2p --help
      #-------------------------------------------------------
      #iptables -A FORWARD -p tcp -m ipp2p --edk -j DROP
      #iptables -A FORWARD -p udp -m ipp2p --edk -j DROP
      #iptables -A FORWARD -p tcp -m ipp2p --dc -j DROP
      #iptables -A FORWARD -p tcp -m ipp2p --kazaa -j DROP
      #iptables -A FORWARD -p udp -m ipp2p --kazaa -j DROP
      #iptables -A FORWARD -p tcp -m ipp2p --gnu -j DROP
      #iptables -A FORWARD -p udp -m ipp2p --gnu -j DROP
      #iptables -A FORWARD -p tcp -m ipp2p --bit -j DROP
      #iptables -A FORWARD -p udp -m ipp2p --bit -j DROP
      #iptables -A FORWARD -p tcp -m ipp2p --apple -j DROP
      #iptables -A FORWARD -p tcp -m ipp2p --winmx -j DROP
      #iptables -A FORWARD -p tcp -m ipp2p --soul -j DROP
      #iptables -A FORWARD -p tcp -m ipp2p --ares -j DROP
      
      # IP WITH HTTPS - 443 ACCESS GRANTED (ACCESS LEVEL 2)
      #-----------------------------------------------------------------------------
      iptables -A FORWARD -s $RED.56 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.59 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.67 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.69 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.73 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.74 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.77 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.79 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.80 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.102 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.104 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.150 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.176 -p tcp --dport 443 -j ACCEPT	# USER
      iptables -A FORWARD -s $RED.201 -p tcp --dport 443 -j ACCEPT	# USER
      
      #----------------------
      
      # BLOCKING YOUTUBE AND TWITTER
      # TO BLOCK YOUTUBE, FIRST WE NEED TO ACCEPT GOOGLE REQUESTS BECAUSE BOTH DOMAINS
      # DEPENDS ON SAME SERVERS OR IP ADDRESS BUT DOMAIN REQUEST IS INDEPENDENT.
      # AFTER THIS, I PERMIT ACCESS TO GOOGLE DOMAIN BUT NOT TO YOUTUBE DOMAIN
      #-----------------------------------------------------------------------------
      iptables -A FORWARD -m string --string "google.com" --algo bm -j ACCEPT
      iptables -A FORWARD -m string --string "youtube.com" --algo bm -j DROP
      #iptables -A FORWARD -m string --string "dropbox.com" --algo bm -j DROP
      
      iptables -A FORWARD -d 199.59.148.0/22 -j DROP # Twitter
      
      # BLOCKED YOUTUBE, BLOCKED DOWNLOADS, UBLOCKED FACEBOOK  (ACCESS LEVEL 3
      #-----------------------------------------------------------------------------
      iptables -A FORWARD -s $RED.49 -p tcp --dport 443 -j ACCEPT	# USER
      
      # BLOCKED FACEBOOK SERVERS
      #-----------------------------------------------------------------------------
      iptables -A FORWARD -d 65.201.208.24/29 -j DROP
      iptables -A FORWARD -d 65.204.104.128/28 -j DROP
      iptables -A FORWARD -d 66.92.180.48/29 -j DROP
      iptables -A FORWARD -d 67.200.105.48/28 -j DROP
      iptables -A FORWARD -d 69.63.176.0/30 -j DROP
      iptables -A FORWARD -d 69.171.224.0/20 -j DROP
      iptables -A FORWARD -d 74.119.76.0/19 -j DROP
      iptables -A FORWARD -d 204.25.20.0/22 -j DROP
      iptables -A FORWARD -d 66.220.144.0/20 -j DROP
      iptables -A FORWARD -d 173.252.64.0/18 -j DROP
      
      # SCHOOLOGY.COM
      #----------------------------------------------------------
      #iptables -A FORWARD -d 151.101.0.0/16 -j ACCEPT
      #iptables -A FORWARD -m string --string "schoology.com" --algo bm -j ACCEPT
      #iptables -I INPUT -p tcp --dport 443 -m string --string "schoology.com" --algo bm -j ACCEPT
      
      # GRANT ACCESS TO HTTPS - 443 WEBSITES
      #-------------------------------------------------------------------------------
      
      #iptables -A FORWARD -s 52.2.100.81 -p tcp --dport 443 -j ACCEPT		# WEBSITE
      #iptables -A FORWARD -s 52.204.251.50 -p tcp --dport 443 -j ACCEPT		# WEBSITE
      #iptables -A FORWARD -s 107.23.6.245 -p tcp --dport 443 -j ACCEPT		# WEBSITE
      #iptables -A FORWARD -s 52.21.168.68 -p tcp --dport 443 -j ACCEPT		# WEBSITE
      
      #iptables -A FORWARD -p tcp -m iprange --dst-range 74.125.0.0-74.125.255.255 --dport 443 -j ACCEPT	# Google
      iptables -A FORWARD -d 74.125.0.0/16 -j ACCEPT					# Google
      #iptables -A FORWARD -p tcp -d accounts.google.com --dport 443 -j ACCEPT	# Gmail
      #iptables -A FORWARD -p tcp -m iprange --dst-range 172.194.46.0-173.194.46.255 --dport 443 -j ACCEPT	# Gmail
      #iptables -A FORWARD -p tcp -d mail.google.com --dport 443 -j ACCEPT		# Gmail
      
      #iptables -A FORWARD -s 187.210.186.221 -p tcp --dport 443 -j ACCEPT		# WEBSITE
      #iptables -A FORWARD -s 187.191.75.171 -p tcp --dport 443 -j ACCEPT		# WEBSITE
      #iptables -A FORWARD -p tcp -d www.website.com --dport 443 -j ACCEPT	# 
      
      #iptables -A FORWARD -s 65.66.206.154 -p tcp --dport 443 -j ACCEPT		# Hotmail
      #iptables -A FORWARD -p tcp -d live.com --dport 443 -j ACCEPT			# Hotmail
      #iptables -A FORWARD -p tcp -d login.live.com --dport 443 -j ACCEPT		# Hotmail
      #iptables -A FORWARD -p tcp -d secure.shared.live.com --dport 443 -j ACCEPT	# Hotmail
      #iptables -A FORWARD -p tcp -d outlook.com --dport 443 -j ACCEPT		# Hotmail
      
      #iptables -A FORWARD -d 157.54.0.0/15 -j ACCEPT		# Outlook.com
      #iptables -A FORWARD -d 157.56.0.0/14 -j ACCEPT		# Outlook.com
      #iptables -A FORWARD -d 157.60.0.0/16 -j ACCEPT		# Outlook.com
      #iptables -A FORWARD -d 132.245.0.0/16 -j ACCEPT	# Outlook.com
      #iptables -A FORWARD -d 131.253.62.0/23 -j DROP 	# login.live.com
      #iptables -A FORWARD -d 131.253.128.0/17 -j DROP 	# login.live.com
      #iptables -A FORWARD -d 131.253.61.0/24 -j DROP 	# login.live.com
      #iptables -A FORWARD -d 131.253.64.0/18 -j DROP 	# login.live.com
      #iptables -A FORWARD -d 65.52.0.0/14 -j DROP 		# mail.live.com
      
      iptables -A FORWARD -d 189.202.196.50 -j ACCEPT
      iptables -A FORWARD -d 189.203.200.235 -j ACCEPT
      
      # ALL PORTS BLOCKED
      #-------------------------------------------------------------------------------
      #iptables -A INPUT -j DROP
      #iptables -A OUTPUT -j DROP
      #iptables -A FORWARD -j LOG
      
      #iptables -A FORWARD -p tcp --dport 443 -j DROP	# HTTPS
      

      What i want to know or confirm is if i can configure something like this:

      # BLOCKING YOUTUBE AND TWITTER
      # TO BLOCK YOUTUBE, FIRST WE NEED TO ACCEPT GOOGLE REQUESTS BECAUSE BOTH DOMAINS
      # DEPENDS ON SAME SERVERS OR IP ADDRESS BUT DOMAIN REQUEST IS INDEPENDENT.
      # AFTER THIS, I PERMIT ACCESS TO GOOGLE DOMAIN BUT NOT TO YOUTUBE DOMAIN
      #-----------------------------------------------------------------------------
      iptables -A FORWARD -m string --string "google.com" --algo bm -j ACCEPT
      iptables -A FORWARD -m string --string "youtube.com" --algo bm -j DROP
      #iptables -A FORWARD -m string --string "dropbox.com" --algo bm -j DROP
      
      iptables -A FORWARD -d 199.59.148.0/22 -j DROP # Twitter
      

      So i can make an IP alias on firewall rules to block some users on LAN

      Best regards!

      1 Reply Last reply Reply Quote 0
      • D
        doktornotor Banned last edited by

        There is no iptables on FreeBSD. Wrong forum, dude.

        1 Reply Last reply Reply Quote 0
        • I
          isolatedvirus last edited by

          you could probably accomplish this with squid using URL lists.

          1 Reply Last reply Reply Quote 0
          • K
            kpa last edited by

            PF is a strict layer 3 packet filter and that means that it won't look inside the data payload on the packets no matter what you do. As noted you'll need a proxy of some sort to accomplish layer 7 filtering on pfSense.

            1 Reply Last reply Reply Quote 0
            • F
              Fabio72 last edited by

              Also with Snort you can do something like this.
              For example https://forum.pfsense.org/index.php?topic=84227.0

              1 Reply Last reply Reply Quote 0
              • pozolero
                pozolero last edited by

                @doktornotor:

                There is no iptables on FreeBSD. Wrong forum, dude.

                Thanks for answer dude.

                I'll quote

                Hi everyone!  I have an iptables script (Yes, i know pfsense doesn't use iptables) but i think it's a clever script.

                This script was on a debian server with squid in transparent mode, and was for blocking https (443) connections for domains like youtube.com without blocking google.com domain. Both domains use same ip address.

                My question is: Is it possible to achieve something like this firewall rules on pfsense?

                :-)

                1 Reply Last reply Reply Quote 0
                • pozolero
                  pozolero last edited by

                  @Fabio72:

                  Also with Snort you can do something like this.
                  For example https://forum.pfsense.org/index.php?topic=84227.0

                  Look very interesting!!  I'll try to make some test on virtualbox.

                  Thanks a lot

                  1 Reply Last reply Reply Quote 0
                  • pozolero
                    pozolero last edited by

                    @isolatedvirus:

                    you could probably accomplish this with squid using URL lists.

                    Thanks for your answer, the problem is https sites over transparent squid.

                    1 Reply Last reply Reply Quote 0
                    • pozolero
                      pozolero last edited by

                      @kpa:

                      PF is a strict layer 3 packet filter and that means that it won't look inside the data payload on the packets no matter what you do. As noted you'll need a proxy of some sort to accomplish layer 7 filtering on pfSense.

                      Thank for your answer

                      1 Reply Last reply Reply Quote 0
                      • I
                        isolatedvirus last edited by

                        @pozolero:

                        @isolatedvirus:

                        you could probably accomplish this with squid using URL lists.

                        Thanks for your answer, the problem is https sites over transparent squid.

                        squid can handle https sites, just not transparently IIRC. youll have to load the cert on each computer passing through the proxy at that point.

                        HOWEVER, a IP alias in pfsense "Firewall->Alias->IP->Add->Type: URL (IPs)" can accept hostnames and domain names. If your goal is to just block access to these sites, you can create an alias, add all the websites/domains in there you want, and create a deny rule when user traffic is destined to them. This is accomplished by pfsense periodically doing a nslookup on anything in that list, and adding every IP it receives in response to its list.

                        This would affectively stop http and https, as well as any traffic to the destined hosts.

                        1 Reply Last reply Reply Quote 0
                        • pozolero
                          pozolero last edited by

                          @isolatedvirus:

                          squid can handle https sites, just not transparently IIRC. youll have to load the cert on each computer passing through the proxy at that point.

                          HOWEVER, a IP alias in pfsense "Firewall->Alias->IP->Add->Type: URL (IPs)" can accept hostnames and domain names. If your goal is to just block access to these sites, you can create an alias, add all the websites/domains in there you want, and create a deny rule when user traffic is destined to them. This is accomplished by pfsense periodically doing a nslookup on anything in that list, and adding every IP it receives in response to its list.

                          This would affectively stop http and https, as well as any traffic to the destined hosts.

                          I'll try this, thank you

                          1 Reply Last reply Reply Quote 0
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