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After configuring IPSec with Openswan, you need to ensure the firewall configuration allows connections to pass through. To do this, you need to enable TCP protocol 50, the Encapsulating Security Payload (which authenticates and encrypts VPN traffic), to and from the systems you want to connect in your firewall configuration. You need to do this on both of the systems you are connecting, as well as on any network devices such as firewalls or routers between the two systems. The emphasis on the word protocol is important. You are not enabling a port here. You are enabling the ESP encryption and authentication protocol that is not bound to a particular port (using the iptables option -p).16 You also need to enable UDP port 500 between the systems and other devices for the Internet Key Exchange (IKE), which handles connection and key negotiation. Listing 3-25 shows some simple iptables rules for this.

Listing 3-25. iptables Rules for Openswan and IPSec iptables iptables iptables iptables -A -A -A -A INPUT OUTPUT INPUT OUTPUT -p -p -p -p 50 -j ACCEPT 50 -j ACCEPT udp --sport 500 --dport 500 -j ACCEPT udp --sport 500 --dport 500 -j ACCEPT

I recommend you further adjust these rules to allow only protocol 50 and UDP port 500 traffic from specific gateways (in other words, only from those systems to which you want to connect). This is the basic configuration required for almost all Openswan configurations. Some additional configurations also require the Authentication Header (AH) protocol, which handles packet authentication. If you do need the AH protocol, then you will need to also enable protocol 51. The Openswan and IPSec documentation clearly indicates in what circumstances this protocol is also required. Enter the following: iptables -A INPUT -p 51 -j ACCEPT iptables -A OUTPUT -p 51 -j ACCEPT

This is a simple transformation that is used to remove debug attributes when the application is built in release mode.

With copies of the ipsec.conf file on both systems, you want to connect, and with the firewalls rules right, you can now attempt to start the VPN tunnel. You use the ipsec auto command to start a VPN tunnel. Enter the following: puppy# ipsec auto --up puppy_to_kitten 102 "puppy_to_kitten" #1: STATE_MAIN_I1: initiate 104 "puppy_to_kitten" #1: STATE_MAIN_I2: from STATE_MAIN_I1; sent MI2, expecting MR2 106 "puppy_to_kitten" #1: STATE_MAIN_I3: from STATE_MAIN_I2; sent MI3, expecting MR3 004 "puppy_to_kitten" #1: STATE_MAIN_I4: ISAKMP SA established 110 "puppy_to_kitten" #2: STATE_QUICK_I1: initiate 004 "puppy_to_kitten" #2: STATE_QUICK_I2: sent QI2, IPSec SA established You only need to start the connection from one system. Once you have run this command, your IPSec tunnel should be up and connected. You can also use the ipsec auto command to shut down the connection. Enter the following: puppy# ipsec auto --down puppy_to_kitten The ipsec command comes with a variety of other useful functions. One of which is barf, which outputs a considerable quantity of debugging and logging data that is often useful for assisting in resolving issues and problems with Openswan. Listing 3-26 shows how to run barf. Listing 3-26. Debugging Openswan puppy# ipsec barf > barf.log Here I have directed the barf output to a file. Another useful command if you have changed your IPSec configuration is the ipsec setup command, which you can use to stop and restart IPSec. Enter the following:

puppy# ipsec setup --stop puppy# ipsec setup --start You can see details of the other ipsec commands by entering the following: puppy$ ipsec --help

In the previous section you looked at securing persistent connections in the form of always active applications such as a mail server or a network-enabled syslog daemon But other types of connections exist also, most notably on-demand connections such as those initiated and controlled by the inetd or xinetd daemons (sometimes called master daemons) As a result of the number of systems that use inetd and xinetd, it is worth taking a brief look at these daemons and decide whether you need to run them These daemons monitor the ports defined to them, and if they receive a connection on that port, then the daemons start the required application The inetd/xinetd daemons can also provide access control (including using TCP Wrappers) and additional logging while they manage the applications and connections.