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CHAPTER 3 s SECURING CONNECTIONS AND REMOTE ADMINISTRATION
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IPSec, VPNs, and Openswan
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IPSec is short for IP security and represents a collection of extension standards and protocols for the original Internet protocol related to the secure exchange of IP packets. It was first developed for IPv6 and then made backward compatible for IPv4. At the core of this collection of standards is RFC2401.12 A variety of products and tools use IPSec to secure connections between systems. IPSec works at a lower level than the SSL/TLS protocols. Whereas SSL operates between the network and application layers, IPSec encrypts traffic at the IP level and is capable of encapsulating the entire IP datagram (tunnel mode) or just the data portion of the IP datagram (transport mode). The tunnel mode allows the encapsulation of the entire original IP datagram with a new encrypted datagram. While the transport mode encrypts only the payload of the IP datagram, leaving the IP header unencrypted. With IPSec you could even layer a protocol like SSL/TLS over the top of a connection, further enhancing your security. You will now look at the S/WAN13 implementation of IPSec. S/WAN can be best described as a virtual private network (VPN) solution. S/WAN stands for secure wide area network and was an initiative by RSA Security both to develop a standard for the use of IPSec to build VPNs and to promote the deployment of Internet-based VPNs using IPSec. While S/WAN is no longer being actively developed, a number of open-source packages have developed out of the S/WAN project. One example of this is Openswan. Openswan is an open-source S/WAN IPSec implementation principally for Linux and other *nix operating systems (though it also supports Windows to some degree). It is available at http://www.openswan.org/. I will show you how to install Openswan and create a VPN tunnel between two subnets over the Internet using RSA encryption.14 You can perform other tasks with Openswan, including a variety of functions aimed at providing remote VPN connectivity for roving users. See the Openswan wiki for further details.15
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s Additionally, you do not have to only connect two systems. You could also connect a system to a Tip firewall or router. For example, instructions are available at http://www.johnleach.co.uk/documents/ freeswan-pix/freeswan-pix.html that should provide a starting point for connections between a system and a Cisco PIX firewall using Openswan.
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Openswan has a couple of prerequisites for installation. These are the GMP (GNU MultiPrecision) libraries from http://swox.com/gmp/. These should probably be installed by default on your distribution, but an up-to-date version is the safest. Openswan itself is available in two branches of code, which you can download from http://www.openswan.org/code/. The first, version 2, supports all current kernels up to version 2.6 and is the current path of development of the Openswan package. The second, version 1, supports only kernel versions 2.0, 2.2, and 2.4. It contains a fixed feature set that is somewhat limited compared to the version 2
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12. http://www.faqs.org/rfcs/rfc2401.html 13. Pronounced swan 14. You can also use shared secrets and X.509 certificate authentication with Openswan. 15. http://wiki.openswan.org/
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branch. Openswan version 1 is well tested and stable, but given the lack of support for 2.6 kernels it may have a limited life span as more people upgrade to more recent kernel versions. I recommend going with the version 2 branch for this reason to avoid a potentially complicated upgrade path as more distributions default to a version 2.6 kernel. For the purposes of this explanation, I will assume you are going to download the version 2 branch of Openswan.
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s Caution Openswan works best with 2.4.x and 2.6.x kernels, and I recommend that all your systems run
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at least version 2.4. Indeed, not only is support unpredictable for older versions of 2.0 and 2.2 kernels (2.0 earlier than release 2.0.39 and 2.2 earlier than release 2.2.20), but these versions of the kernel also suffer from a variety of security issues.
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Installing Openswan on kernel version 2.4 is not an easy task for a beginner because it involves working with your kernel. If this worries you or you are not comfortable with activities such as working with your kernel or recompiling your kernel, I recommend you avoid Openswan.
s Red Hat Enterprise Linux 3-0 (AS, WS, and ES) and Red Hat Fedora Core 2 do not require a kernel Tip
recompilation; although they have version 2.4 kernels, they also have the IPSec modules from the version 2.6 kernel that is backward compatible.
Download Openswan from the Web site. If you are running Red Hat Enterprise 3 or Fedora Core 2 based systems, you are able to install Openswan via RPM. If you have downloaded the RPM, then install it using the following command and move onto the section talking about Openswan configuration. Enter the following: puppy# rpm -Uvh openswan-version.as3.i386.rpm If you have downloaded the source package, then unpack the package and change to the resulting directory. For kernel version 2.4 systems, you need a clean copy of your kernel source either from your distribution or downloaded via http://www.kernel.org. The best method to ensure your installation goes smoothly is to compile your kernel from source prior to installing Openswan. Once you have done this, make a note of the location of your kernel source package and you can begin to install Openswan. If you require Network Address Translation Traversal (NAT-T) support, you need to patch the kernel source. NAT-T allows IPSec traffic to work with NAT devices such as routers and firewalls. From inside the Openswan source directory, run the following command replacing the /path/to/kernel/source with the location of your kernel source, as follows. The last command make bzImage will make a new boot image for your system. You will need to install this new boot image; I recommend you reboot after this to test the new boot image. puppy$ make nattpatch | (cd /path/to/kernel/source && patch -p1 && make bzImage)
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