OpenIKED

OpenIKED is a free and open-source implementation of the Internet Key Exchange protocol version 2 (IKEv2). It is primarily designed for use in virtual private network (VPN) and IPsec security solutions. Developed as part of the OpenBSD project, OpenIKED aims to provide a secure, reliable, and easy-to-audit IKEv2 implementation.

OpenIKED focuses on security and adheres to the principle of least privilege. It is written in a memory-safe language (C) and undergoes rigorous code review and security auditing. The design prioritizes a clean and simple architecture to facilitate easier maintenance and reduce the attack surface.

The software handles the key exchange process, establishing security associations (SAs) between two communicating endpoints. This involves authenticating the peers, negotiating encryption algorithms, and generating shared secrets used for securing the subsequent data transfer. OpenIKED works in conjunction with other tools, such as ipsecctl (in OpenBSD), or similar tools in other operating systems, to manage IPsec policies and configure the network stack.

Key features of OpenIKED include:

• IKEv2 Support: Fully implements the IKEv2 protocol as defined in RFC 7296 and related RFCs.
• Modern Cryptographic Algorithms: Supports a variety of modern cryptographic algorithms for encryption, authentication, and key exchange.
• X.509 Certificate Authentication: Supports authentication using X.509 certificates.
• EAP Authentication: Implements support for Extensible Authentication Protocol (EAP) methods for user authentication.
• IPv6 Support: Fully supports IPv6, including IKEv2 over IPv6.
• Minimal Dependencies: Designed to have minimal dependencies, simplifying deployment and reducing potential vulnerabilities.
• Cross-Platform Compatibility: While originating in OpenBSD, OpenIKED has been ported to other operating systems, including Linux and macOS.
• Configuration: Configuration is typically achieved through a configuration file that defines policies, authentication methods, and other parameters.

OpenIKED is used in various applications, including:

• VPN Gateways: As a key component in VPN gateways, providing secure connectivity between networks.
• Road Warrior VPNs: Enabling secure remote access for individual users connecting to a network.
• Site-to-Site VPNs: Establishing secure connections between geographically separated networks.

OpenIKED provides a robust and secure solution for establishing IKEv2-based VPNs and securing IPsec communications.