strongSwan

h1. Integration into the Android VPN frontend

To easily setup IKEv2/IPsec VPN connections with EAP-authentication on Android we prepared a set of patches that integrate strongSwan into the default Android VPN frontend.

The patches should apply cleanly to the Android 2.2 (Froyo) sources.

h2. Register charon

We [[Android|previously]] described how to build strongSwan, the Kernel and libvstr. To register [[Charon|charon]] as a daemon, the @init.rc@ file of the @system/core@ project has to be patched (attachment:system.core.patch).

<pre>

cd /patch/to/android/source

cd system/core

patch -p1 < /path/to/system.core.patch

cd -

</pre>

h2. Framework

The actual VPN types and the Daemon Proxy provided in the @frameworks/base@ project have to be extended by another patch (attachment:frameworks.base.patch).

<pre>

cd frameworks/base

patch -p1 < /path/to/frameworks.base.patch

cd -

</pre>

h2. Settings (Frontend)

And with a final patch (attachment:packages.apps.Settings.patch) the actual frontend in the @packages/apps/Settings@ project is extended.

<pre>

cd packages/apps/Settings

patch -p1 < /path/to/packages.apps.Settings.patch

cd -

</pre>

Building the complete source tree completes the integration.

h2. Example Gateway Configuration

h3. Certificates

A gateway certificate signed by a Certificate Authority (CA) is required and the CA-certificate has to be installed on the Android phone. This can be done easily via the integrated browser. The web server has to provide @application/x-x509-ca-cert@ as MIME-type for the certificate to trigger the installation on the phone.

h3. Configuration

The following example gateway configuration can be used with the Android client (basically, you can use the same [[Win7EapMultipleConfig|configuration]] as for the [[Windows7|Windows 7]] clients).

[[IpsecConf|ipsec.conf]]

<pre>

# ipsec.conf - strongSwan IPsec configuration file

conn android

	leftsubnet=0.0.0.0/0

	leftcert=vpnCert.pem

	leftauth=pubkey

	leftid=@vpn.strongswan.org

	right=%any

	rightsourceip=10.0.5.0/24

	rightauth=eap-mschapv2

	rightsendcert=never

	keyexchange=ikev2

	eap_identity=%any

	auto=add

</pre>

[[IpsecSecrets|ipsec.secrets]]

<pre>

# /etc/ipsec.secrets - strongSwan IPsec secrets file

: RSA vpnKey.pem

carol : EAP "abcd1234"

dave  : EAP "fghj5678"

</pre>

[[StrongswanConf|strongswan.conf]]

<pre>

# /etc/strongswan.conf - strongSwan configuration file

charon {

	dns1 = 62.2.17.60

	dns2 = 62.2.24.162

}

</pre>