Version 4.5.2¶

• The whitelist plugin for the IKEv2 daemon maintains an in-memory identity
  whitelist. Any connection attempt of peers not whitelisted will get rejected.
  The 'ipsec whitelist' utility provides a simple command line frontend for
  whitelist administration.

• The duplicheck plugin provides a specialized form of duplicate checking,
  doing a liveness check on the old SA and optionally notify a third party
  application about detected duplicates.

• The coupling plugin permanently couples two or more devices by limiting
  authentication to previously used certificates.

• In the case that the peer config and child config don't have the same name
  (usually in SQL database defined connections), ipsec up|route <peer config>
  starts|routes all associated child configs and ipsec up|route <child config>
  only starts|routes the specific child config.

• fixed the encoding and parsing of X.509 certificate policy statements (CPS).

• Duncan Salerno contributed the eap-sim-pcsc plugin implementing a
  pcsc-lite based SIM card backend.

• The eap-peap plugin implements the EAP PEAP protocol. Interoperates
  successfully with a FreeRADIUS server and Windows 7 Agile VPN clients.

• The IKEv2 daemon charon rereads strongswan.conf on SIGHUP and instructs
  all plugins to reload. Currently only the eap-radius and the attr plugins
  support configuration reloading.

• Added userland support to the IKEv2 daemon for Extended Sequence Numbers
  support coming with Linux 2.6.39. To enable ESN on a connection, add
  the 'esn' keyword to the proposal. The default proposal uses 32-bit sequence
  numbers only ('noesn'), and the same value is used if no ESN mode is
  specified. To negotiate ESN support with the peer, include both, e.g.
  esp=aes128-sha1-esn-noesn.

• In addition to ESN, Linux 2.6.39 gained support for replay windows larger
  than 32 packets. The new global strongswan.conf option 'charon.replay_window'
  configures the size of the replay window, in packets.