glenn 01/02/03 08:41:10
Added: catalina/docs tomcat-security.html
Log:
Implement SecurityManager
Revision Changes Path
1.1 jakarta-tomcat-4.0/catalina/docs/tomcat-security.html
Index: tomcat-security.html
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<title>Using the Java SecurityManager with Tomcat</title>
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<h1>
Using the Java SecurityManager with Tomcat</h1>
<ul>
<li>
<a href="#why">Why use a SecurityManager?</a></li>
<li>
<a href="#requirements">System Requirements</a></li>
<li>
<a href="#precautions">Precautions</a></li>
<li>
<a href="#permissions">Types of Permissions</a></li>
<li>
<a href="tomcat-security-unix.html">Tomcat SecurityManager setup with Unix</a></li>
<li>
<a href="#violation">What happens when the SecurityManager detects a Security
violation?</a></li>
</ul>
<h3>
<a NAME="why"></a>Why use a SecurityManager?</h3>
The Java SecurityManager is what allows a web browser to run an applet
in its own sandbox to prevent untrusted code from accessing files on the
local system, connecting to a host other than the one the applet was loaded
from, etc.
<p>In the same way the SecurityManager protects you from an untrusted applet
running in your browser, use of a SecurityManager while running Tomcat
can protect your server from trojan servlets, JSP's, JSP beans, and tag
libraries. Or even inadvertent mistakes.
<p>Imagine if someone who is authorized to publish JSP's on your site invadvertently
included the following in their JSP:
<blockquote>
<pre><% System.exit(1); %></pre>
</blockquote>
<p><br>Every time that JSP was executed by Tomcat, Tomcat would exit.
<p>Using the Java SecurityManager is just one more line of defense a system
administrator can use to keep the server secure and reliable.
<h3>
<a NAME="requirements"></a>System Requirements</h3>
Use of the SecurityManager requires a JVM that supports JDK 1.2.
<br>
<h3>
<a NAME="precautions"></a>Precautions</h3>
Implementation of a SecurityManager in Tomcat has not been fully tested
or had a security audit. Make sure that you are satisfied with
your SecurityManager configuration before allowing untrusted users to publish
web applications, JSP's, servlets, beans, or tag libraries.
<p>Still, running with a SecurityManager is definitely better than running
without one.
<br>
<h3>
<a NAME="permissions"></a>Types of Permissions</h3>
Permission classes are used to define what Permissions a class loaded by
Tomcat will have. There are a number of Permission classes as part
of the JDK and you can even create your own Permission class for use in
your own web applications.
<p>This is just a short summary of the System SecurityManager Permission
classes applicable to Tomcat. Please refer to the JDK documentation
for more information on using the below Permissions.
<p><b>java.util.PropertyPermission</b>
<br> Controls read/write access to JVM properties such
as java.home.
<p><b>java.lang.RuntimePermission</b>
<br> Controls use of some System/Runtime functions like
exit() and exec().
<p><b>java.io.FilePermission</b>
<br> Controls read/write/execute access to files and
directories.
<p><b>java.net.SocketPermission</b>
<br> Controls use of network sockets.
<p><b>java.net.NetPermission</b>
<br> Controls use of multicast network connections.
<p><b>java.lang.reflect.ReflectPermission</b>
<br> Controls use of reflection to do class introspection.
<p><b>java.security.SecurityPermission</b>
<br> Controls access to Security methods.
<p><b>java.security.AllPermission</b>
<br> Allows access to all permissions, just as if you
were running Tomcat without a SecurityManager.
<br>
<h3>
<a NAME="violation"></a>What happens when the SecurityManager detects a
Security violation?</h3>
The JVM will throw an AccessControlException or a SecurityException when
the SecurityManager detects a security policy violation.
<br>
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