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Several mangle table targets are shown here:
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TOS TCPMSS ECN DSCP ROUTE Modify the Type of Service field to manage the priority of the packet Modify the allowed size of packets for a connection, enabling larger transmissions Remove ECN black hole information Change DSCP bits Extension TARGET to modify destination information in the packet
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NOTE The IPtables package is designed to be extensible, allowing customized targets to be added
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easily This involves applying patches to the kernel and rebuilding it See netfilterorg for more details, along with a listing of extended targets
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Though you can enter IPtables rules from the shell command line, when you shut down your system, these commands will be lost You will most likely need to place your IPtables rules in a script that can then be executed directly This way you can edit and manage a complex set of rules, adding comments and maintaining their ordering
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You now have enough information to create a simple IPtables script that will provide basic protection for a single system connected to the Internet The following script, myfilter, provides an IPtables filtering process to protect a local network and a website from outside attacks This example uses IPtables and IPv4 addressing For IPv6 addressing you would use ip6tables, which has corresponding commands, except for the NAT rules, which would be implemented as mangle rules The script configures a simple firewall for a private network (check the IPtables HOWTO for a more complex example) If you have a local network, you can adapt this script to it In this configuration, all remote access initiated from the outside is blocked, but two-way communication is allowed for connections that users in the network make with outside systems In this example, the firewall system functions as a gateway for a private network whose network address is 19216800 (see Figure 20-1) The Internet address is, for the sake
PART V
FIGURE 20-1 A network with a rewall
Part V:
Security
FIGURE 20-2 Firewall rules applied to a local network example
of this example, 10001 The system has two Ethernet devices: one for the private network (eth1) and one for the Internet (eth0) The gateway firewall system also supports a web server at address 10002 Entries in this example that are too large to fit on one line are continued on a second line, with the newline quoted with a backslash The basic rules as they apply to different parts of the network are illustrated in Figure 20-2 myfilter
# Firewall Gateway system IP address is 10001 using Ethernet device eth0 # Private network address is 19216800 using Ethernet device eth1 # Website address is 10002 # turn off IP forwarding echo 0 > /proc/sys/net/ipv4/ip_forward # Flush chain rules iptables -F INPUT iptables -F OUTPUT iptables -F FORWARD # set default (policy) rules iptables -P INPUT DROP iptables -P OUTPUT ACCEPT iptables -P FORWARD ACCEPT # IP spoofing, deny any packets on the internal network that have an external source address iptables -A INPUT -j LOG -i eth1 \! -s 19216800/24 iptables -A INPUT -j DROP -i eth1 \! -s 19216800/24 iptables -A FORWARD -j DROP -i eth1 \! -s 19216800/24
20:
Firewalls
# IP spoofing, deny any outside packets (any not on eth1) that have the source address of the internal network iptables -A INPUT -j DROP \! -i eth1 -s 19216800/24 iptables -A FORWARD -j DROP \! -i eth1 -s 19216800/24 # IP spoofing, deny any outside packets with localhost address # (packets not on the lo interface (any on eth0 or eth1) that have the source address of localhost) iptables -A INPUT -j DROP -i \! lo -s 127000/255000 iptables -A FORWARD -j DROP -i \! lo -s 127000/255000 # allow all incoming messages for users on your firewall system iptables -A INPUT -j ACCEPT -i lo # allow communication to the web server (address 10002), port www iptables -A INPUT -j ACCEPT -p tcp -i eth0 --dport www -s 10002 # Allow established connections from web servers to internal network iptables -A INPUT -m state --state ESTABLISHED,RELATED -i eth0 -p tcp --sport www -s 10002 -d 19216800/24 -j ACCEPT # Prevent new connections from web servers to internal network iptables -A OUTPUT -m state --state NEW -o eth0 -p tcp --sport www -d 19216800/24 -j DROP # allow established and related outside communication to your system # allow outside communication to the firewall, except for ICMP packets iptables -A INPUT -m state --state ESTABLISHED,RELATED -i eth0 -p \! icmp -j ACCEPT # prevent outside-initiated connections iptables -A INPUT -m state --state NEW -i eth0 -j DROP iptables -A FORWARD -m state --state NEW -i eth0 -j DROP # allow all local communication to and from the firewall on eth1 from the local network iptables -A INPUT -j ACCEPT -p all -i eth1 -s 19216800/24 # Set up masquerading to allow internal machines access to outside network iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE # Accept ICMP Ping and Destination-unreachable messages # Others will be rejected by INPUT and OUTPUT DROP policy iptables -A INPUT -j ACCEPT -p icmp -i eth0 --icmp-type echo-reply -d 10001 iptables -A INPUT -j ACCEPT -p icmp -i eth0 --icmp-type echo-request -d 10001 iptables -A INPUT -j ACCEPT -p icmp -i eth0 --icmp-type destination -unreachable -d 10001 # Turn on IP Forwarding echo 1 > /proc/sys/net/ipv4/ip_forward
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