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<HTML><HEAD><TITLE>Acegi Security System for Spring</TITLE>
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<BODY>
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<HR>
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2006-05-29 09:26:29 -04:00
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<B><CENTER>What is Acegi Security?</CENTER></B>
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<HR>
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<BR>
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Acegi Security is a powerful, flexible security solution for enterprise software,
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with a particular emphasis on applications that use
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<A href="http://www.springframework.org/">Spring</A>. Using Acegi Security provides your
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applications with comprehensive authentication, authorization, instance-based access control,
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channel security and human user detection capabilities.
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<BR>
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<HR>
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<B><CENTER>Key Features</CENTER></B>
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<HR>
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<BR>
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<UL>
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<LI><B>Stable and mature.</B> Acegi Security 1.0.0 was released in May 2006 after
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more than two and a half years of use in large production software projects, 70,000+ downloads
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and hundreds of community contributions.
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In terms of release numbering, we also use the <A
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href="http://apr.apache.org/versioning.html">Apache APR Project
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Versioning Guidelines</A> so that you can easily identify release
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compatibility.<BR><BR>
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<LI><B>Well documented:</B> All APIs are fully documented using
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<a href="http://acegisecurity.sourceforge.net/multiproject/acegi-security/apidocs/index.html">JavaDoc</a>,
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with almost 100 pages of
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<a href="reference.html">Reference Guide</a> documentation providing an easy-to-follow
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introduction. Even more documentation is provided on this web site, as
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shown in the left hand navigation sidebar.<BR><BR>
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<LI><B>Fast results:</B> View our <a href="suggested.html">suggested steps</a>
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for the fastest way to develop complex, security-compliant applications.<BR><BR>
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<LI><B>Enterprise-wide single sign on:</B> Using JA-SIG's open
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source <A href="http://www.ja-sig.org/products/cas/">Central Authentication
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Service</A> (CAS), the Acegi Security can participate
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in an enterprise-wide single sign on environment. You no longer need
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every web application to have its own authentication database. Nor are
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you restricted to single sign on across a single web container. Advanced
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single sign on features like proxy support and forced refresh of logins
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are supported by both CAS and Acegi Security.<BR><BR>
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<LI><B>Reuses your Spring expertise:</B> We use Spring application
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contexts for all configuration, which should help Spring developers get
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up-to-speed nice and quickly.<BR><BR>
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<LI><B>Domain object instance security:</B> In many applications it's
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desirable to define Access Control Lists (ACLs) for individual domain
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object instances. We provide a comprehensive ACL package with features
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including integer bit masking, permission inheritence (including
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blocking), a JDBC-backed ACL repository, caching and a pluggable,
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interface-driven design.<BR><BR>
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<LI><B>Non-intrusive setup:</B> The entire security system can operate
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within a single web application using the provided filters. There is no
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need to make special changes or deploy libraries to your Servlet or EJB
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container.<BR><BR>
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<LI><B>Full (but optional) container integration:</B> The credential
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collection and authorization capabilities of your Servlet or EJB
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container can be fully utilised via included "container adapters". We
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currently support Catalina (Tomcat), Jetty, JBoss and Resin, with
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additional containers easily added.<BR><BR>
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<LI><B>Keeps your objects free of security code:</B> Many applications
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need to secure data at the bean level based on any combination of
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parameters (user, time of day, authorities held, method being invoked,
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parameter on method being invoked....). This package gives you this
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flexibility without adding security code to your Spring business
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objects.<BR><BR>
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<LI><B>After invocation security:</B> Acegi Security can not only protect
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methods from being invoked in the first place, but it can also
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deal with the objects returned from the methods. Included implementations
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of after invocation security can throw an exception or mutate the returned
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object based on ACLs.<BR><BR>
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<LI><B>Secures your HTTP requests as well:</B> In addition to securing
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your beans, the project also secures your HTTP requests. No longer is it
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necessary to rely on web.xml security constraints. Best of all, your
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HTTP requests can now be secured by your choice of regular expressions
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or Apache Ant paths, along with pluggable authentication, authorization
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and run-as replacement managers.<BR><BR>
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<LI><B>Channel security:</B> Acegi Security can
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automatically redirect requests across an appropriate transport channel.
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Whilst flexible enough to support any of your "channel" requirements (eg
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the remote user is a human, not a robot), a common channel security
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feature is to ensure your secure pages will only be available over
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HTTPS, and your public pages only over HTTP. Acegi Security also
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supports unusual port combinations (including if accessed via an
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intermediate server like Apache) and pluggable transport decision
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managers.<BR><BR>
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<LI><B>Supports HTTP BASIC authentication:</B> Perfect for remoting
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protocols or those web applications that prefer a simple browser pop-up
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(rather than a form login), Acegi Security can directly process HTTP
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BASIC authentication requests as per RFC 1945.<BR><BR>
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<LI><B>Supports HTTP Digest authentication:</B> For greater security than
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offered by BASIC authentcation, Acegi Security also supports Digest Authentication
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(which never sends the user's password across the wire). Digest Authentication
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is widely supported by modern browsers. Acegi Security's implementation complies
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with both RFC 2617 and RFC 2069.<BR><BR>
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<LI><B>Computer Associates Siteminder support:</B> Authentication can be
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delegated through to CA's Siteminder solution, which is common in large
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corporate environments.<BR><BR>
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<LI><B>X509 (Certificate) support:</B> Acegi Security can easily read
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client-side X509 certificates for authenticating users.<BR><BR>
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<LI><B>LDAP Support:</B> Do you have an LDAP directory? Acegi Security can
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happily authenticate against it.<BR><BR>
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<LI><B>Tag library support:</B> Your JSP files can use our taglib
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to ensure that protected content like links and messages are only
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displayed to users holding the appropriate granted authorities. The taglib
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also fully integrates with Acegi Security's ACL services, and
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obtaining extra information about the logged-in principal.<BR><BR>
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<LI><B>Configuration via IoC XML, Commons Attributes, or JDK 5 Annotations:</B> You
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select the method used to configure your security environment. The
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project supports configuration via Spring application contexts, as well
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as Jakarta Commons Attributes and Java 5's annotations feature. Some users
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(such as those building content management systems) pull configuration data
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from a database, which exemplifies Acegi Security's flexible configuration
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metadata system.<BR><BR>
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<LI><B>Various authentication backends:</B> We include the ability to
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retrieve your user and granted authority definitions from an XML
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file, JDBC datasource or Properties file. Alternatively, you can implement the
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single-method UserDetailsService interface and obtain authentication details from
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anywhere you like.<BR><BR>
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<LI><B>Event support:</B> Building upon Spring's
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<CODE>ApplicationEvent</CODE> services, you can write your own listeners
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for authentication-related events, along with authorisation-related events.
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This enables you to implement account lockout and audit log systems, with
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complete decoupling from Acegi Security code.<BR><BR>
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<LI><B>Easy integration with existing databases:</B> Our implementations
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have been designed to make it very easy to use your existing
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authentication schema and data (without modification). Of course,
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you can also provide your own Data Access Object if you wish.<BR><BR>
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<LI><B>Caching:</B> Acegi Security integrates with Spring's <A
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href="http://ehcache.sourceforge.net/">EHCACHE</A> factory.
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This flexibility means your database (or other authentication
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repository) is not repeatedly queried for authentication
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information.<BR><BR>
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<LI><B>Pluggable architecture:</B> Every critical aspect of the package
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has been modelled using high cohesion, loose coupling, interface-driven
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design principles. You can easily replace, customise or extend parts of
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the package.<BR><BR>
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<LI><B>Startup-time validation:</B> Every critical object dependency and
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configuration parameter is validated at application context startup
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time. Security configuration errors are therefore detected early and
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corrected quickly.<BR><BR>
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<LI><B>Remoting support:</B> Does your project use a rich client? Not a
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problem. Acegi Security integrates with standard Spring remoting
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protocols, because it automatically processes the HTTP BASIC
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authentication headers they present. Add our BASIC authentication filter
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to your web.xml and you're done. You can also easily use RMI or Digest
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authentication for your rich clients with a simple configuration statement.<BR><BR>
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<LI><B>Advanced password encoding:</B> Of course, passwords in your
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authentication repository need not be in plain text. We support both SHA
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and MD5 encoding, and also pluggable "salt" providers to maximise
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password security. Acegi Security doesn't even need to see the password
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if your backend can use a bind-based strategy for authentication (such as
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an LDAP directory, or a database login).<BR><BR>
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<LI><B>Run-as replacement:</B> The system fully supports
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temporarily replacing the authenticated principal for the duration of the web
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request or bean invocation. This enables you to build public-facing
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object tiers with different security configurations than your backend
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objects.<BR><BR>
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<LI><B>Transparent security propagation:</B> Acegi Security can automatically
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transfer its core authentication information from one machine to another,
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using a variety of protocols including RMI and Spring's HttpInvoker.<BR><BR>
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<LI><B>Compatible with HttpServletRequest's security methods:</B> Even though
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Acegi Security can deliver authentication using a range of pluggable mechanisms
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(most of which require no web container configuration), we allow you to access
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the resulting Authentication object via the getRemoteUser() and other
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security methods on HttpServletRequest.<BR><BR>
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<LI><B>Unit tests:</B> A must-have of any quality security project, unit
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tests are included. Our unit test coverage is very high, as shown in the
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<a href="multiproject/acegi-security/clover/index.html">coverage report</a>.<BR><BR>
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<LI><B>Built by Maven:</B> This assists you in effectively reusing the Acegi
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Security artifacts in your own Maven-based projects.<BR><BR>
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<LI><B>Supports your own unit tests:</B> We provide a number of classes
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that assist with your own unit testing of secured business objects. For
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example, you can change the authentication identity and its associated
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granted authorities directly within your test methods.<BR><BR>
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<LI><B>Peer reviewed:</B> Whilst nothing is ever completely secure,
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using an open source security package leverages the continuous design
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and code quality improvements that emerge from peer review.<BR><BR>
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<LI><B>Community:</B> Well-known for its supportive community, Acegi Security
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has an active group of developers and users. Visit our project resources (below)
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to access these services.<BR><BR>
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<LI><B>Apache license.</B> You can confidently use Acegi Security in your project.<BR><BR></LI></UL><BR><B>
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<HR>
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<CENTER>Project Resources</CENTER></B>
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<HR>
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<BR>
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<CENTER>
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<A href="http://forum.springframework.org/"><B>Support Forums</B></A><BR><BR>
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<A href="mail-lists.html"><B>Developer Mailing List</B></A><BR><BR>
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<A href="downloads.html"><B>Downloads</B></A>
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</CENTER></FONT>
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