Distributed Access Control System (DACS)
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DACS is a light-weight single sign-on and role-based access control system for web servers and server-based software. It is also an authentication and authorization toolkit for programmers. DACS makes secure resource sharing and remote access via the web easier, safer, and more efficient.

DACS provides:

* universal, extensible, modular, and efficient authentication methods,
including two-factor authentication and hardware tokens
* powerful, comprehensive, rule-based authorization checking that can
be applied selectively and transparently to any resource or activity
(such as web services, web content, and program features) by
Apache-based web services, CGI programs, servlets, or virtually any
program or script
* secure, web-based single sign-on (SSO)
* flexible, programmable configuration
* an Apache 2.0/2.2 module, suite of CGI-based programs, and collection
of command line tools