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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
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<TITLE>Introduction to FreeS/WAN</TITLE>
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<A HREF="toc.html">Contents</A>
<A HREF="adv_config.html">Previous</A>
<A HREF="config.html">Next</A>
<HR>
<H1><A name="install">Installing FreeS/WAN</A></H1>
<P>This document will teach you how to install Linux FreeS/WAN. If your
distribution comes with Linux FreeS/WAN, we offer tips to get you
started.</P>
<H2><A NAME="15_1">Requirements</A></H2>
<P>To install FreeS/WAN you must:</P>
<UL>
<LI>be running Linux with the 2.4 or 2.2 kernel series. See this<A HREF="http://www.freeswan.ca/download.php#contact">
kernel compatibility table</A>.
<BR>We also have experimental support for 2.6 kernels. Here are two
basic approaches:
<UL>
<LI> install FreeS/WAN, including its<A HREF="ipsec.html#parts"> KLIPS</A>
kernel code. This will remove the native IPsec stack and replace it
with KLIPS.</LI>
<LI> install the FreeS/WAN<A HREF="ipsec.html#parts"> userland tools</A>
(keying daemon and supporting scripts) for use with<A HREF="http://lartc.org/howto/lartc.ipsec.html">
2.6 kernel native IPsec</A>,</LI>
</UL>
See also these<A HREF="2.6.known-issues"> known issues with 2.6</A>.</LI>
<LI>have root access to your Linux box</LI>
<LI>choose the version of FreeS/WAN you wish to install based on<A HREF="http://www.freeswan.org/mail.html">
mailing list reports</A>
<!-- or
our updates page (coming soon)-->
</LI>
</UL>
<H2><A NAME="15_2">Choose your install method</A></H2>
<P>There are three basic ways to get FreeS/WAN onto your system:</P>
<UL>
<LI>activating and testing a FreeS/WAN that<A HREF="#distroinstall">
shipped with your Linux distribution</A></LI>
<LI><A HREF="#rpminstall">RPM install</A></LI>
<LI><A HREF="#srcinstall">Install from source</A></LI>
</UL>
<A NAME="distroinstall"></A>
<H2><A NAME="15_3">FreeS/WAN ships with some Linuxes</A></H2>
<P>FreeS/WAN comes with<A HREF="intro.html#distwith"> these
distributions</A>.</P>
<P>If you're running one of these, include FreeS/WAN in the choices you
make during installation, or add it later using the distribution's
tools.</P>
<H3><A NAME="15_3_1">FreeS/WAN may be altered...</A></H3>
<P>Your distribution may have integrated extra features, such as Andreas
Steffen's X.509 patch, into FreeS/WAN. It may also use custom startup
script locations or directory names.</P>
<H3><A NAME="15_3_2">You might need to create an authentication keypair</A>
</H3>
<P>If your FreeS/WAN came with your distribution, you may wish to
generate a fresh RSA key pair. FreeS/WAN will use these keys for
authentication.</P>
<P> To do this, become root, and type:</P>
<PRE> ipsec newhostkey --output /etc/ipsec.secrets --hostname xy.example.com
chmod 600 /etc/ipsec.secrets</PRE>
<P>where you replace xy.example.com with your machine's fully-qualified
domain name. Generate some randomness, for example by wiggling your
mouse, to speed the process.</P>
<P>The resulting ipsec.secrets looks like:</P>
<PRE>: RSA {
# RSA 2192 bits xy.example.com Sun Jun 8 13:42:19 2003
# for signatures only, UNSAFE FOR ENCRYPTION
#pubkey=0sAQOFppfeE3cC7wqJi...
Modulus: 0x85a697de137702ef0...
# everything after this point is secret
PrivateExponent: 0x16466ea5033e807...
Prime1: 0xdfb5003c8947b7cc88759065...
Prime2: 0x98f199b9149fde11ec956c814...
Exponent1: 0x9523557db0da7a885af90aee...
Exponent2: 0x65f6667b63153eb69db8f300dbb...
Coefficient: 0x90ad00415d3ca17bebff123413fc518...
}
# do not change the indenting of that "}"</PRE>
<P>In the actual file, the strings are much longer.</P>
<H3><A NAME="15_3_3">Start and test FreeS/WAN</A></H3>
<P>You can now<A HREF="install.html#starttest"> start FreeS/WAN and test
whether it's been successfully installed.</A>.</P>
<A NAME="rpminstall"></A>
<H2><A NAME="15_4">RPM install</A></H2>
<P>These instructions are for a recent Red Hat with a stock Red Hat
kernel. We know that Mandrake and SUSE also produce FreeS/WAN RPMs. If
you're running either, install using your distribution's tools.</P>
<H3><A NAME="15_4_1">Download RPMs</A></H3>
<P>Decide which functionality you need:</P>
<UL>
<LI>standard FreeS/WAN RPMs. Use these shortcuts:
<BR>
<UL>
<LI>(for 2.6 kernels: userland only)
<BR> ncftpget
ftp://ftp.xs4all.nl/pub/crypto/freeswan/binaries/RedHat-RPMs/\*userland*
</LI>
<LI>(for 2.4 kernels)
<BR> ncftpget
ftp://ftp.xs4all.nl/pub/crypto/freeswan/binaries/RedHat-RPMs/`uname -r
| tr -d 'a-wy-z'`/\*</LI>
<LI> or view all the offerings at our<A href="ftp://ftp.xs4all.nl/pub/crypto/freeswan/binaries/RedHat-RPMs">
FTP site</A>.</LI>
</UL>
</LI>
<LI>unofficial<A href="http://www.freeswan.ca/download.php"> Super
FreeS/WAN</A> RPMs, which include Andreas Steffen's X.509 patch and
more. Super FreeS/WAN RPMs do not currently include<A HREF="glossary.html#NAT.gloss">
Network Address Translation</A> (NAT) traversal, but Super FreeS/WAN
source does.</LI>
</UL>
<A NAME="2.6.rpm"></A>
<P>For 2.6 kernels, get the latest FreeS/WAN userland RPM, for example:</P>
<PRE> freeswan-userland-2.04.9-0.i386.rpm</PRE>
<P>Note: FreeS/WAN's support for 2.6 kernel IPsec is preliminary. Please
see<A HREf="2.6.known-issues"> 2.6.known-issues</A>, and the latest<A HREF="http://www.freeswan.org/mail.html">
mailing list reports</A>.</P>
<P>Change to your new FreeS/WAN directory, and make and install the</P>
<P>For 2.4 kernels, get both kernel and userland RPMs. Check your kernel
version with</P>
<PRE> uname -r</PRE>
<P>Get a kernel module which matches that version. For example:</P>
<PRE> freeswan-module-2.04_2.4.20_20.9-0.i386.rpm</PRE>
<P>Note: These modules<B> will only work on the Red Hat kernel they were
built for</B>, since they are very sensitive to small changes in the
kernel.</P>
<P>Get FreeS/WAN utilities to match. For example:</P>
<PRE> freeswan-userland-2.04_2.4.20_20.9-0.i386.rpm</PRE>
<H3><A NAME="15_4_2">For freeswan.org RPMs: check signatures</A></H3>
<P>While you're at our ftp site, grab the RPM signing key</P>
<PRE> freeswan-rpmsign.asc</PRE>
<P>If you're running RedHat 8.x or later, import this key into the RPM
database:</P>
<PRE> rpm --import freeswan-rpmsign.asc</PRE>
<P>For RedHat 7.x systems, you'll need to add it to your<A HREF="glossary.html#PGP">
PGP</A> keyring:</P>
<PRE> pgp -ka freeswan-rpmsign.asc</PRE>
<P>Check the digital signatures on both RPMs using:</P>
<PRE> rpm --checksig freeswan*.rpm </PRE>
<P>You should see that these signatures are good:</P>
<PRE> freeswan-module-2.04_2.4.20_20.9-0.i386.rpm: pgp md5 OK
freeswan-userland-2.04_2.4.20_20.9-0.i386.rpm: pgp md5 OK</PRE>
<H3><A NAME="15_4_3">Install the RPMs</A></H3>
<P>Become root:</P>
<PRE> su</PRE>
<P>For a first time install, use:</P>
<PRE> rpm -ivh freeswan*.rpm</PRE>
<P>To upgrade existing RPMs (and keep all .conf files in place), use:</P>
<PRE> rpm -Uvh freeswan*.rpm</PRE>
<P>If you're upgrading from FreeS/WAN 1.x to 2.x RPMs, and encounter
problems, see<A HREF="upgrading.html#upgrading.rpms"> this note</A>.</P>
<H3><A NAME="15_4_4">Start and Test FreeS/WAN</A></H3>
<P>Now,<A HREF="install.html#starttest"> start FreeS/WAN and test your
install</A>.</P>
<A NAME="srcinstall"></A>
<H2><A NAME="15_5">Install from Source</A></H2>
<!-- Most of this section, along with "Start and Test", can replace
INSTALL. -->
<H3><A NAME="15_5_1">Decide what functionality you need</A></H3>
<P>Your choices are:</P>
<UL>
<LI><A HREF="ftp://ftp.xs4all.nl/pub/crypto/freeswan">standard FreeS/WAN</A>
,</LI>
<LI>standard FreeS/WAN plus any of these<A HREF="web.html#patch">
user-supported patches</A>, or</LI>
<LI><A HREF="http://www.freeswan.ca/download">Super FreeS/WAN</A>, an
unofficial FreeS/WAN pre-patched with many of the above. Provides
additional algorithms, X.509, SA deletion, dead peer detection, and<A HREF="glossary.html#NAT.gloss">
Network Address Translation</A> (NAT) traversal.</LI>
</UL>
<H3><A NAME="15_5_2">Download FreeS/WAN</A></H3>
<P>Download the source tarball you've chosen, along with any patches.</P>
<H3><A NAME="15_5_3">For freeswan.org source: check its signature</A></H3>
<P>While you're at our ftp site, get our source signing key</P>
<PRE> freeswan-sigkey.asc</PRE>
<P>Add it to your PGP keyring:</P>
<PRE> pgp -ka freeswan-sigkey.asc</PRE>
<P>Check the signature using:</P>
<PRE> pgp freeswan-2.04.tar.gz.sig freeswan-2.04.tar.gz</PRE>
<P>You should see something like:</P>
<PRE> Good signature from user "Linux FreeS/WAN Software Team (build@freeswan.org)".
Signature made 2002/06/26 21:04 GMT using 2047-bit key, key ID 46EAFCE1</PRE>
<!-- Note to self: build@freeswan.org has angled brackets in the original.
Changed because it conflicts with HTML tags. -->
<H3><A NAME="15_5_4">Untar, unzip</A></H3>
<P>As root, unpack your FreeS/WAN source into<VAR> /usr/src</VAR>.</P>
<PRE> su
mv freeswan-2.04.tar.gz /usr/src
cd /usr/src
tar -xzf freeswan-2.04.tar.gz
</PRE>
<H3><A NAME="15_5_5">Patch if desired</A></H3>
<P>Now's the time to add any patches. The contributor may have special
instructions, or you may simply use the patch command.</P>
<H3><A NAME="15_5_6">... and Make</A></H3>
<P>Choose one of the methods below.</P>
<H4>Userland-only Install for 2.6 kernels</H4>
<A NAME="2.6.src"></A>
<P>Note: FreeS/WAN's support for 2.6 kernel IPsec is preliminary. Please
see<A HREf="2.6.known-issues"> 2.6.known-issues</A>, and the latest<A HREF="http://www.freeswan.org/mail.html">
mailing list reports</A>.</P>
<P>Change to your new FreeS/WAN directory, and make and install the
FreeS/WAN userland tools.</P>
<PRE> cd /usr/src/freeswan-2.04
make programs
make install</PRE>
<P>Now,<A HREF="install.html#starttest"> start FreeS/WAN and test your
install</A>.</P>
<H4>KLIPS install for 2.2, 2.4, or 2.6 kernels</H4>
<A NAME="modinstall"></A>
<P>To make a modular version of KLIPS, along with other FreeS/WAN
programs you'll need, use the command sequence below. This will change
to your new FreeS/WAN directory, make the FreeS/WAN module (and other
stuff), and install it all.</P>
<PRE> cd /usr/src/freeswan-2.04
make oldmod
make minstall</PRE>
<P><A HREF="install.html#starttest">Start FreeS/WAN and test your
install</A>.</P>
<P>To link KLIPS statically into your kernel (using your old kernel
settings), and install other FreeS/WAN components, do:</P>
<PRE> cd /usr/src/freeswan-2.04
make oldmod
make minstall</PRE>
<P>Reboot your system and<A HREF="install.html#testonly"> test your
install</A>.</P>
<P>For other ways to compile KLIPS, see our Makefile.</P>
<A name="starttest"></A>
<H2><A NAME="15_6">Start FreeS/WAN and test your install</A></H2>
<P>Bring FreeS/WAN up with:</P>
<PRE> service ipsec start</PRE>
<P>This is not necessary if you've rebooted.</P>
<A name="testonly"></A>
<H2><A NAME="15_7">Test your install</A></H2>
<P>To check that you have a successful install, run:</P>
<PRE> ipsec verify</PRE>
<P>You should see at least:</P>
<PRE>
Checking your system to see if IPsec got installed and started correctly
Version check and ipsec on-path [OK]
Checking for KLIPS support in kernel [OK]
Checking for RSA private key (/etc/ipsec.secrets) [OK]
Checking that pluto is running [OK]
</PRE>
<P>If any of these first four checks fails, see our<A href="trouble.html#install.check">
troubleshooting guide</A>.</P>
<H2><A NAME="15_8">Making FreeS/WAN play well with others</A></H2>
<P>There are at least a couple of things on your system that might
interfere with FreeS/WAN, and now's a good time to check these:</P>
<UL>
<LI>Firewalling. You need to allow UDP 500 through your firewall, plus
ESP (protocol 50) and AH (protocol 51). For more information, see our
updated firewalls document (coming soon).</LI>
<LI>Network address translation. Do not NAT the packets you will be
tunneling.</LI>
</UL>
<H2><A NAME="15_9">Configure for your needs</A></H2>
<P>You'll need to configure FreeS/WAN for your local site. Have a look
at our<A HREF="quickstart.html"> opportunism quickstart guide</A> to
see if that easy method is right for your needs. Or, see how to<A HREF="config.html">
configure a network-to-network or Road Warrior style VPN</A>.</P>
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