What’s New in strongSwan 6.0

Plugins

New Plugins

The following new libstrongswan plugins have been added:

Plugin Name Description

frodo

FrodoKEM post quantum safe key exchange method

oqs

Open quantum safe plugin based on the liboqs library

Removed Plugins

The following deprecated libstrongswan plugins have been removed:

Plugin Name Description

bliss

Bimodal Lattice Signature Scheme (BLISS) post-quantum computer signature scheme

newhope

Key exchange based on post-quantum computer New Hope algorithm

ntru

Key exchange based on post-quantum computer NTRU encryption

Default Plugins

The powerful openssl crypto plugin is now enabled by default:

Plugin Name Description

openssl

Crypto backend based on the OpenSSL library

Due to the nearly all-encompassing capabilities of the openssl default crypto plugin, the following libstrongswan plugins are not enabled by default anymore:

Plugin Name Description

aes

AES-128/192/256 cipher software implementation

curve25519

X25519 DH group and Ed25519 public key authentication

des

DES/3DES cipher software implementation

fips-prf

PRF specified by FIPS, used by EAP-SIM/AKA algorithms

gmp

RSA/DH crypto backend based on libgmp

hmac

HMAC wrapper using various hashers

md5

MD5 hasher software implementation

pkcs12

PKCS#12 decoding routines

rc2

RC2 cipher software implementation

sha1

SHA1 hasher software implementation

sha2

SHA-2 hasher software implementation

The legacy stroke management interface has been deprecated for many years and has been replaced by the versatile vici management interface. Thus with strongSwan 6.0, the stroke plugin is not enabled by default anymore and has to be built separately.
Plugin Name Description

stroke

Deprecated stroke configuration/control backend used with ipsec script and starter

Thus the following 25 plugins are now enabled by default.

Configuration Options

The following strongswan.conf configuration option is now enabled by default:

Key Default Description [Default]

make_before_break

yes

Initiate IKEv2 reauthentication with a make-before-break instead of a break-before-make scheme. Make-before-break uses overlapping IKE and CHILD SA during reauthentication by first recreating all new SAs before deleting the old ones. This behavior can be beneficial to avoid connectivity gaps during reauthentication, but requires support for overlapping SAs by the peer. strongSwan can handle such overlapping SAs since version 5.3.0