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Martin Willi, 29.10.2009 18:24


NetworkManager

NetworkManager allows configuration and control of VPN daemons through a plugin interface. We provide such a plugin for NetworkManager to configure road warrior clients for the most common setups.

NetworkManager uses DBUS to communicate with a plugin loaded by the IKEv2 charon daemon.

The plugin uses a certificate for gateway authentication and supports EAP and RSA authentication for client authentication. PSK is not supported, as it is considered insecure if the secrets are not strong enough.

You can use any password based EAP method supported by strongSwan (MD5/GTC/MSCHAPv2) or private key authentication. Private keys are either stored in a file or accessed through your ready-to-use ssh-agent. You'll need a certificate matching that key.

If you configure the gateway certificate directly on the clients, there are no requirements to the certificate. If you deploy CA certificates (supported in 4.3.1+), the gateway certificate will need a subjectAltName including the Hostname of the gateway (the same you enter in the clients configuration). Starting with version 4.3.5, you can also use preinstalled root CA certificates of your distribution, using the --with-nm-ca-dir configure option. Just do not specify any gateway/CA certificate to use preinstalled root certificates.
h2. Dependencies

The strongSwan NM plugin and the NetworkManager VPN module are currently based on the NetworkManager 7.1/7.99 interface. It should work with your distributors latest packages.

Installation

In Debian Testing and Ubuntu Karmic Koala, install the network-manager-strongswan packages.

If you are not running Ubuntu/Debian, you have to build strongSwan from source.

Building from source

To build from source, you additionally need the PAM headers for EAP-GTC and NetworkManager headers for the plugin:

aptitude install libpam0g-dev network-manager-dev libnm-util-dev libnm-glib-dev libgnomeui-dev gnome-common

NM integration works only for IKEv2, but this allows us to disable a lot of IKEv1 legacy stuff. Since on a desktop we have OpenSSL installed anyway, we are going to use libcrypto for all cryptographical operations. --enable-agent builds the ssh-agent private key plugin, EAP plugins are enabled using --enable-eap-gtc --enable-eap-md5 --enable-eap-mschapv2. You may build only what you'll actually use.

# get the strongSwan tarball
wget http://download.strongswan.org/strongswan-4.3.5.tar.bz2
tar xjf strongswan-4.3.5.tar.bz2
cd strongswan-4.3.5

# build charon with OpenSSL/NM Plugin
./configure --sysconfdir=/etc --prefix=/usr --libexecdir=/usr/lib \
   --disable-aes --disable-des --disable-md5 --disable-sha1 --disable-sha2 \
   --disable-fips-prf --disable-gmp --disable-stroke --disable-pluto --disable-tools \
   --disable-updown --enable-openssl --enable-nm --enable-agent \
   --enable-eap-gtc --enable-eap-md5 --enable-eap-mschapv2
make
make install

# get the NetworkManager strongsSwan plugin as a tarball
wget http://download.strongswan.org/NetworkManager/NetworkManager-strongswan-1.1.1.tar.bz2
tar xjf NetworkManager-strongswan-1.1.1.tar.bz2
cd NetworkManager-strongswan-1.1.1

# build the NetworkManager strongsSwan plugin
./configure --sysconfdir=/etc --prefix=/usr --libexecdir=/usr/lib --with-charon=/usr/lib/ipsec/charon
make
make install

Configuration

  • Click on nm-applet -> VPN Connections -> Configure VPN...
  • Add -> Ipsec/IKEv2 (strongswan) -> Create ...
  • Configure your client
  • Click on nm-applet -> VPN Connections -> Your Connection
  • Enter password

As you can see, there is no subnet configuration for the tunnel. We let the gateway administration choose the subnet; the client always proposes 0.0.0.0/0 for the remote network and the gateway narrows that down to the configured subnet.

Screenshots

Server configuration

Depending on the used authentication methods, you can use gateway configurations very similar to Windows 7 (Certificate/MSCHAPv2), or use EAP-GTC to authenticate against PAM.