Best Authentication Software for C

FreeRADIUS is a robust, highly efficient, and modular open-source RADIUS solution that encompasses a server, client library, development libraries, and a variety of additional tools. It stands as the most widely utilized RADIUS server worldwide, serving as the backbone for prominent Internet Service Providers and telecom companies, and is instrumental in powering eduroam, the global Wi-Fi roaming service for educational institutions. This software boasts support for a diverse array of authentication protocols, which include PAP, CHAP, and all types of EAP, such as EAP-TLS, EAP-TTLS, and EAP-PEAP with EAP-MSCHAP. Its modular architecture facilitates adaptable configurations, allowing for conditional processing of requests, integration with LDAP and SQL databases, and the ability to run external scripts. The support for virtual servers simplifies intricate implementations while also minimizing maintenance expenses. Additionally, FreeRADIUS accommodates more than 100 vendor-specific attributes, guaranteeing compatibility with numerous network access servers and contributing to its widespread adoption in various settings.