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Is the security-manager enabled in your server?

Posted by felipegaucho on January 4, 2006 at 2:37 PM PST

Recently I have tried to run Cejug-Classifieds on GlassFish - my first
try was frustrated because the application didn't open even the first
page. And the server console didn't reflect anything about the problem.
Very strange, but very didactic also, as I will explain in this blog entry.

assume Tomcat as its target server
and it also was tested
on Geronimo and

. Due to these successful tests, I got confused
about such a difficulty to run it on
. After few inspections and with a very helpful support from

GlassFish forum
, I figured out the

issues. Glassfish comes with the security-manager
enabled by default
and it avoided my application to include security
restrictions on demand - my original algorithm. The Cejug-Classifieds has a security module based on a JassFilter designed to authenticate user requests. During the JaasFilter instantiation, the system adds a set of file names into the system properties.


On the code below copied from the login module, the method
init(FilterConfig) of the filter tries to set the name of the
properties files as

System properties
, but it is not allowed when the security-manager is enabled:

	public void init(FilterConfig arg0) throws ServletException {
ServletContext context = arg0.getServletContext();
System.setProperty("", "");
System.setProperty("", context
System.setProperty("", context
System.setProperty("", context

* JAAS is a subject to a further blog entry - for now, I will focus on the security-manager.

The work around this problem and the discussions about security
revealed a curiosity: the most popular web-servers come with the
security-manager disabled. Why?
The server vendors argue about the facility
of disabling security-manager
during the development phase and also argue about the need of a experienced
technician in order to configure the correct details during the deployment
into a production server. Well, I agree in part with such policy but I perceive the
damage on the culture of the developers. How many times did you, developer,
think about the security-manager and its functionality? If you answer
almost never or if you even don't know what this thing means, don't
worry - you are part of the majority of Java community that never has time
or interest to learn about that.

Another interesting detail is about the
2 Platform Enterprise Edition
Specification, v1.4
which claims that the Security Manager is not
optional; it must be enabled in the Application Server
. Glassfish
just follows the specification - and why the other servers don

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Very good

Some basic concepts are ignored by some developers