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strongSwan on FreeBSD » History » Version 21

Martin Larsson, 27.07.2017 09:22

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h1. strongSwan on FreeBSD
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{{>toc}}
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Since [[4.3.4|strongSwan 4.3.4]] the IKE daemon charon runs on "FreeBSD":http://www.freebsd.org. There are still some [[FreeBSD#Limitations|limitations]] but
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it has since been tested by several users (even with an adapted version of our "test framework":http://www.strongswan.org/uml-testing.html).
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Please note that releases before [[5.0.0]] don't support IKEv1 because the old pluto IKEv1 daemon was not ported to FreeBSD.
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h2. Prepare FreeBSD
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Starting with FreeBSD 11, IPsec is now enabled in the kernel, by default. However, if you need NAT Traversal you will still have to enable the @IPSEC_NAT_T@ option and build your own kernel (see below).
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FreeBSD 11.1 and above now has NAT-T included as well and GENERIC kernel will work.
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In versions older than FreeBSD 11.0 the generic kernel does not come with IPsec support enabled. So you will have to compile your own kernel.
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The NAT Traversal patch is included in the kernel sources since FreeBSD 8, so you don't have to apply any patches yourself, if you need that feature.
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h3. Build the Kernel
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Basic documentation on how to build a custom kernel can be found in the "FreeBSD Handbook":http://www.freebsd.org/doc/handbook/kernelconfig-building.html.
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To enable IPsec you'll need to add the following options to your kernel configuration file:
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<pre>
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options   IPSEC
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device    crypto
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</pre>
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You can verify that your kernel has IPsec support using the following command, which should print a list of ipsec specific kernel state.
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<pre>
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/sbin/sysctl -a | grep ipsec
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</pre>
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If you need NAT Traversal, add the following option to your kernel config:
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<pre>
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options   IPSEC_NAT_T
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</pre>
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h2. Install FreeBSD Port / Package
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The easiest way to install strongSwan on FreeBSD is to use the "security/strongswan":http://www.freshports.org/security/strongswan port
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<pre>
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cd /usr/ports/security/strongswan/ && make install clean
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</pre>
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or to install the binary package with
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<pre>
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pkg install strongswan
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</pre>
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or in earlier FreeBSD releases with
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<pre>
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pkg_add -r strongswan
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</pre>
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h2. Manual Installation
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h3. Install Packages
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Our test-system was installed using the Developer and Kern-Developer distributions in sysinstall. So there are maybe additional packages required on your system.
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The packages required to build strongSwan are as follows:
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* libgmp (optional, depending on configuration)
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* openssl (optional, depending on configuration)
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Notes:
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* The "printf-Bug":http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/133776 in earlier FreeBSD releases has been fixed and backported to FreeBSD 8. Thus, the *vstr* string library is not required anymore (check the history of this wiki page for details).
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h3. Building strongSwan
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Get the "latest tarball":http://www.strongswan.org/download.html and configure strongSwan as follows (this compiles the GMP plugin, so libgmp is required).
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For details refer to [[InstallationDocumentation]].
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<pre>
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./configure --enable-kernel-pfkey --enable-kernel-pfroute --disable-kernel-netlink \
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            --disable-scripts --with-group=wheel
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</pre>
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Notes:
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* For releases before [[5.0.0]] you also need to add @--disable-pluto@.
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h2. Limitations
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* Before [[5.1.0]] virtual IPs could not be used on clients due to the lack of policy based routing. Since [[5.1.0]] TUN devices are created to implement this, so that FreeBSD can be used as client in road-warrior setups.
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* Before [[5.1.0]] the kernel-pfroute interface lacked several features to properly support MOBIKE.
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* Because there is currently no way to change the IP addresses of an installed IPsec SA in the FreeBSD kernel IPsec SAs are rekeyed when a client's IP address changes. "This discussion":http://forums.freebsd.org/showthread.php?p=226838 on the FreeBSD forums has more on this.
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h2. Known Problems
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* Before [[4.6.0|strongSwan 4.6.0]] [[IpsecStarter|starter]] did not use the modular kernel interfaces, thus, when it tried to detect an IPsec stack it failed:
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<pre>
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Starting strongSwan 4.x.x IPsec [starter]...
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no netkey IPsec stack detected
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no KLIPS IPsec stack detected
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no known IPsec stack detected, ignoring!
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</pre> Fortunately, this detection is not really needed on FreeBSD so simply ignore this message.