strongSwan

Current Release: 5.9.3
Download - Changelog

the OpenSource IPsec-based VPN Solution

runs on Linux 2.6, 3.x and 4.x kernels, Android, FreeBSD, OS X, iOS and Windows
implements both the IKEv1 and IKEv2 (RFC 7296) key exchange protocols
Fully tested support of IPv6 IPsec tunnel and transport connections
Dynamical IP address and interface update with IKEv2 MOBIKE (RFC 4555)
Automatic insertion and deletion of IPsec-policy-based firewall rules
NAT-Traversal via UDP encapsulation and port floating (RFC 3947)
Support of IKEv2 message fragmentation (RFC 7383) to avoid issues with IP fragmentation
Dead Peer Detection (DPD, RFC 3706) takes care of dangling tunnels
Static virtual IPs and IKEv1 ModeConfig pull and push modes
XAUTH server and client functionality on top of IKEv1 Main Mode authentication
Virtual IP address pool managed by IKE daemon or SQL database
Secure IKEv2 EAP user authentication (EAP-SIM, EAP-AKA, EAP-TLS, EAP-TTLS, EAP-PEAP, EAP-MSCHAPv2, etc.)
Optional relaying of EAP messages to AAA server via EAP-RADIUS plugin
Support of IKEv2 Multiple Authentication Exchanges (RFC 4739)
Authentication based on X.509 certificates or preshared keys
Use of strong signature algorithms with Signature Authentication in IKEv2 (RFC 7427)
Retrieval and local caching of Certificate Revocation Lists via HTTP or LDAP
Full support of the Online Certificate Status Protocol (OCSP, RFC 2560).
CA management (OCSP and CRL URIs, default LDAP server)
Powerful IPsec policies based on wildcards or intermediate CAs
Storage of RSA private keys and certificates on a smartcard (PKCS #11 interface) or protected by a TPM 2.0
Modular plugins for crypto algorithms and relational database interfaces
Support of NIST elliptic curve DH groups and ECDSA signatures and certificates (Suite B, RFC 4869)
Support of X25519 elliptic curve DH group (RFC 8031) and Ed25519 signatures and certificates (RFC 8420)
Optional built-in integrity and crypto tests for plugins and libraries
Smooth Linux desktop integration via the strongSwan NetworkManager applet
Trusted Network Connect compliant to PB-TNC (RFC 5793), PA-TNC (RFC 5792), PT-TLS (RFC 6876), PT-EAP (RFC 7171) and SWIMA for PA-TNC (RFC 8412)

strongSwan VPN Client for Android 4 and newer

The free strongSwan App can be downloaded from Google Play. The VPN client supports IKEv2 only with EAP-MD5 or EAP-MSCHAPv2 password-based, or certificate based user authentication and certificate-based VPN gateway authentication.

strongSwan 5.x with Single Monolithic IKEv1/IKEv2 Daemon

The strongSwan 5.x branch supports both the IKEv1 and IKEv2 key exchange protocols in conjunction with the native NETKEY IPsec stack of the Linux kernel. The charon IKE daemon is based on a modern object-oriented and multi-threaded concept, with 100% of the code being written in C. strongSwan's IKEv2 functionality has been successfully tested against 15 IKEv2 vendors during the third and fourth IKEv2 Interoperability Workshops in 2007 and 2008, respectively. The IKEv1 functionality has been re-implemented in 2012 from scratch by extending the source code of our successful IKEv2 charon daemon. IKEv1 interoperability has been tested against the existing strongSwan 4.6 pluto daemon and several third party products.

2021-07-06 info@strongswan.org