Vpnsec Linux install

This procedure assumes using NetworkManager. See below for a manual procedure.

Install the required software:

$ sudo apt-get install network-manager-strongswan strongswan-plugin-eap-mschapv2
The following NEW packages will be installed:
  libstrongswan{a} network-manager-strongswan strongswan-ike{a} strongswan-nm{a}
  strongswan-plugin-eap-mschapv2 strongswan-plugin-openssl{a} 
...

$ sudo service network-manager stop
network-manager stop/waiting
$ sudo service network-manager start
network-manager start/running, process 29031

Configuration:

Select the NetworkManager applet and after that Edit Connections...

Click Add, select IPsec/IKEv2 in the section VPN, click Create

Enter data at:Connection name, Address (vpnsec.science.ru.nl), loginname, etc. and check the marks where needed.

Save: (Save and Close)

Start the VPN. Select the NetworkManager applet, next VPN Connections and finally the connection created.

Known problems

If the VPN connection has been established, but ping ns1.science.ru.nl doesn't work, while ping 131.174.224.4 does work, then probably dnsmasq is the culprit. This can be solved bij disabling the dnsmasq DNS cache, as is described in Ask Ubuntu: DNS problem when connected to a VPN:

First make sure that there are no lines beginning with nameserver in any files in /etc/resolvconf/resolv.conf.d.
If /etc/resolvconf/resolv.conf.d/tail is a symbolic link to target original, make it point to /dev/null.

Second, disconnect from the VPN. Edit /etc/NetworkManager/NetworkManager.conf

$ sudo gedit /etc/NetworkManager/NetworkManager.conf

and comment out

dns=dnsmasq

(i.e., add a # so that it looks like the following)

#dns=dnsmasq

and then

sudo service network-manager restart

Installation without NetworkManager

Note: Below some remarks on doing this for Fedora Core (FC23).

Install strongswan, including the curl, eap-identity, eap-mschapv2 and eap-md4 (required for eap-mschapv2) plugins. When you compile strongswan from source, make sure to pass the right parameters to the configure script.

$ ./configure --enable-curl --enable-md4 --enable-openssl --enable-xauth-eap --enable-eap-md5 --enable-eap-gtc --enable-eap-tls --enable-eap-ttls --enable-eap-peap --enable-eap-mschapv2 --enable-eap-identify
$ make
$ sudo make install

You can test which plugins are loaded with sudo ipsec statusall or sudo ipsec listplugins. If necessary you can load plugins manually by editing strongswan.conf.

Make sure your ipsec.conf, probably located in /etc or in /usr/local/etc, looks like this:

config setup
    strictcrlpolicy=yes

conn %default
    ikelifetime=60m
    keylife=20m
    rekeymargin=3m
    keyingtries=1
    keyexchange=ikev2

conn science
    left=%defaultroute
    leftfirewall=yes
    leftsourceip=%config
    leftauth=eap-mschapv2
    leftid=mysciencelogin        <-- edit this
    eap_identity=mysciencelogin  <-- edit this
    right=vpnsec.science.ru.nl
    rightauth=pubkey
    rightid=@vpnsec.science.ru.nl
    rightsubnet=0.0.0.0/0
    forceencaps=yes
    auto=start

And your ipsec.secrets as follows, where you enter your own Science account name and password. Watch out that this file cannot be read by everyone, as it contains your password! It is typically owned by root:root with -rw------- (600) permissions.

mysciencelogin : EAP "mypassword"

Everything should work now:

$ sudo ipsec start
$ sudo ipsec up science

It can be necessary to put the root certificate in the right folder manually:

$ sudo ln -s /etc/ca-certificates/extracted/cadir/DigiCert_Assured_ID_Root_CA.pem [/usr/local]/etc/ipsec.d/cacerts/DigiCert_Assured_ID_Root_CA.pem

Fedora (FC23)

Work in progress... [Gebruiker:Arjen], FC23, 4/3/2016:

On Fedora (tested on FC23), replace command ipsec by strongswan in the instructions above.

To get the newest SELinux policies, you need to issue:

dnf update --enablerepo=updates-testing selinux-policy

Edit /etc/strongswan/strongswan.d/charon/resolve.conf to include a line:

file = /etc/resolv.conf

To resolve errors about certificate CN=TERENA SSL CA 3 not being trusted:

Navigate to [2] Download DigiCert_Assured_ID_Root_CA.crt and TERENA_SSL_CA_3.crt.

Next, extract the .pem files, copy these to the strongswan config directories, and reread the certificates, like this:

openssl x509 -inform DES -in DigiCert_Assured_ID_Root_CA.crt -out DigiCert_Assured_ID_Root_CA.pem -text
openssl x509 -inform DES -in TERENA_SSL_CA_3.crt -out TERENA_SSL_CA_3.pem -text

cp DigiCert_Assured_ID_Root_CA.pem /etc/strongswan/ipsec.d/cacerts
cp TERENA_SSL_CA_3.pem /etc/strongswan/ipsec.d/certs

strongswan rereadall

To overcome problems with DNS, I had to stop service `libvirtd`. Yet to be resolved.