strongSwan is a complete IPsec implementation for the Linux, Android, Maemo, FreeBSD, and Mac OS X operating systems. It interoperates with with most other IPsec-based VPN products via the IKEv2 or IKEv1 key exchange protocols. The focus of the strongSwan project is on strong authentication mechanisms using X.509 public key certificates and optional secure storage of private keys on smartcards through a standardized PKCS#11 interface. A rich choice of modular plugins adds additional features like Trusted Network Connect or advanced cryptographical algorithms.
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The strongSwan Trusted Network Connect functionality supports all IETF Standard PA-TNC attributes and a new OS IMC/IMV pair using these attributes to transfer Linux or Android operating system information. Interoperability with Windows XP has been improved by supporting PKCS#7 certificate containers and legacy NAT traversal protocols. The test framework has been migrated from User Mode Linux to KVM, making it faster and more robust.
The leftsourceip option now accepts a comma separated combination of %config4, %config6, or fixed IP addresses to request from the responder. Likewise, the rightsourceip option accepts multiple explicitly specified or referenced named address pools. TPM-based remote attestation has been extended to verify the complete measurements done by the Linux Integrity Measurement Architecture (IMA). Reference hash values of up to 10'000 Linux system files are stored in an SQLite database.
The IKEv1 protocol was re-implemented from scratch by extending the successful IKEv2 code. The charon keying daemon now supports both protocols, which allowed the old IKEv1 pluto daemon to be removed. Support for the IKEv1 Aggressive and Hybrid Modes has been added.
An extended EAP-RADIUS interfaces allows one to enforce Session-Timeout attributes using RFC4478 repeated authentication, and acts upon RADIUS Dynamic Authorization extensions (RFC 5176). Currently supported are disconnect requests and CoA messages containing a Session-Timeout. The tnc-pdp plugin implements a RADIUS server interface allowing a strongSwan TNC server to act as a Policy Decision Point.
The Trusted Computing Group Attestation Platform Trust Service (PTS) protocol was implemented. TPM-based remote attestation of Linux IMA (Integrity Measurement Architecture) is now possible. Measurement reference values are automatically stored in a SQLite database. A RADIUS accounting interface was provided along with support for PKCS#8 encoded private keys.