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.
| Tags | Security Cryptography Networking |
|---|---|
| Licenses | GPL |
| Operating Systems | POSIX Linux Android Maemo FreeBSD Mac OS X |
| Implementation | C |
Recent releases


Release Notes: 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.


Release Notes: 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.


Release Notes: Because Ubuntu 11.10 activated the --as-needed ld option that discards included links to dynamic libraries that are not actually used by the charon daemon itself, the loading of plugins depending on external symbols provided by the libsimaka, libtls, or libtnccs libraries failed. As a fix, the plugins include the required libraries directly, and due to relinking during the installation, the approach of computing integrity checksums for plugins had to be changed radically by moving the hash generation from the compilation to the post-installation phase.


Release Notes: The libstrongswan plugin system now supports detailed plugin dependencies. Many plugins have been extended to export their capabilities and requirements. This allows the plugin loader to resolve the plugin loading order automatically, The pkcs11 plugin has been extended to handle Elliptic Curve Cryptography smartcards. The tnc-ifmap plugin implements a TNC IF-MAP 2.0 client which can deliver metadata about IKE_SAs via a SOAP interface to a Trusted Network Connect MAP server.


Release Notes: The IKEv2 charon daemon allows one to define PASS and DROP shunt policies that, for example, prevent local traffic from going through IPsec connections or except certain protocols from IPsec encryption. A new IMC/IMV Scanner pair implements the RFC 5792 PA-TNC protocol. The Integrity Measurement Collector uses netstat to scan for open listening ports on the TNC client and sends a port list to the Integrity Measurement Verifier atttached to the TNC Server, which decides whether the client is admitted to the network based on a configurable port policy.