Version 4.5.1¶

• Sansar Choinyambuu implemented the RFC 5793 Posture Broker Protocol (BP)
  compatible with Trusted Network Connect (TNC). The TNCCS 2.0 protocol
  requires the tnccs_20, tnc_imc and tnc_imv plugins but does not depend
  on the libtnc library. Any available IMV/IMC pairs conforming to the
  Trusted Computing Group's TNC-IF-IMV/IMC 1.2 interface specification
  can be loaded via /etc/tnc_config.

• Re-implemented the TNCCS 1.1 protocol by using the tnc_imc and tnc_imv
  in place of the external libtnc library.

• The tnccs_dynamic plugin loaded on a TNC server in addition to the
  tnccs_11 and tnccs_20 plugins, dynamically detects the IF-TNCCS
  protocol version used by a TNC client and invokes an instance of
  the corresponding protocol stack.

• IKE and ESP proposals can now be stored in an SQL database using a
  new proposals table. The start_action field in the child_configs
  tables allows the automatic starting or routing of connections stored
  in an SQL database.

• The new certificate_authorities and certificate_distribution_points
  tables make it possible to store CRL and OCSP Certificate Distribution
  points in an SQL database.

• The new 'include' statement allows to recursively include other files in
  strongswan.conf. Existing sections and values are thereby extended and
  replaced, respectively.

• Due to the changes in the parser for strongswan.conf, the configuration
  syntax for the attr plugin has changed. Previously, it was possible to
  specify multiple values of a specific attribute type by adding multiple
  key/value pairs with the same key (e.g. dns) to the plugins.attr section.
  Because values with the same key now replace previously defined values
  this is not possible anymore. As an alternative, multiple values can be
  specified by separating them with a comma (e.g. dns = 1.2.3.4, 2.3.4.5).

• ipsec listalgs now appends (set in square brackets) to each crypto
  algorithm listed the plugin that registered the function.

• Traffic Flow Confidentiality padding supported with Linux 2.6.38 can be used
  by the IKEv2 daemon. The ipsec.conf 'tfc' keyword pads all packets to a given
  boundary, the special value '%mtu' pads all packets to the path MTU.

• The new af-alg plugin can use various crypto primitives of the Linux Crypto
  API using the AF_ALG interface introduced with 2.6.38. This removes the need
  for additional userland implementations of symmetric cipher, hash, hmac and
  xcbc algorithms.

• The IKEv2 daemon supports the INITIAL_CONTACT notify as initiator and
  responder. The notify is sent when initiating configurations with a unique
  policy, set in ipsec.conf via the global 'uniqueids' option.

• The conftest conformance testing framework enables the IKEv2 stack to perform
  many tests using a distinct tool and configuration frontend. Various hooks
  can alter reserved bits, flags, add custom notifies and proposals, reorder
  or drop messages and much more. It is enabled using the --enable-conftest
  ./configure switch.

• The new libstrongswan constraints plugin provides advanced X.509 constraint
  checking. In addition to X.509 pathLen constraints, the plugin checks for
  nameConstraints and certificatePolicies, including policyMappings and
  policyConstraints. The x509 certificate plugin and the pki tool have been
  enhanced to support these extensions. The new left/rightcertpolicy ipsec.conf
  connection keywords take OIDs a peer certificate must have.

• The left/rightauth ipsec.conf keywords accept values with a minimum strength
  for trustchain public keys in bits, such as rsa-2048 or ecdsa-256.

• The revocation and x509 libstrongswan plugins and the pki tool gained basic
  support for delta CRLs.