The four offences where people face life sentences are:

• making an incursion into a foreign country with the intent of engaging in hostile activities.

• Preparing for incursions into foreign countries for the purpose of engaging in hostile activities.

• Giving or receiving goods and services to promote the commission of an offence.

• Allowing use of buildings, vessels or aircraft to commit a foreign incursions offence.

http://www.theguardian.com/world/2014/sep/23/australians-travelling-to-fight-in-...