A security manager is an object that defines a security policy for an application. This policy specifies actions that are unsafe or sensitive. Any actions not allowed by the security policy cause a SecurityException to be thrown. An application can also query its security manager to discover which actions are allowed.
Questions tagged [securitymanager]
218 questions
38
votes
4 answers
Preventing System.exit() from API
I am using a third party library that does a System.exit() if it encounters exceptions. I am using the APIs from a jar. Is there anyway that I can prevent the System.exit() call because it causes my application to shutdown? I cannot decompile and…
Swaranga Sarma
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34
votes
3 answers
Java security: Sandboxing plugins loaded via URLClassLoader
Question summary: How do I modify the code below so that untrusted, dynamically-loaded code runs in a security sandbox while the rest of the application remains unrestricted? Why doesn't URLClassLoader just handle it like it says it does?
EDIT:…
Robert J. Walker
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31
votes
6 answers
Java: no security manager: RMI class loader disabled
Hi I have RMI application and now I try to invoke some methods at server from my client. I have following code:
public static void main(final String[] args) {
try {
//Setting the security manager
System.setSecurityManager(new…
Xorty
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22
votes
1 answer
Limiting file access in Java
Problem:
In my Java application (not an applet) I wish to limit certain file operations to all classes except a list/group/package of classes that should not be restricted.
Specifically, I would like to limit...
File reads
File writes
File…
obfuscation
- 1,023
- 3
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21
votes
3 answers
Disable Java reflection for the current thread
I need to call some semi-trustworthy Java code and want to disable the ability to use reflection for the duration of that code's execution.
try{
// disable reflection somehow
someObject.method();
}
finally{
// enable reflection…
Thilo
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17
votes
4 answers
How to sanely configure security policy in Tomcat 6
I'm using Tomcat 6.0.24, as packaged for Ubuntu Karmic. The default security policy of Ubuntu's Tomcat package is pretty stringent, but appears straightforward. In /var/lib/tomcat6/conf/policy.d, there are a variety of files that establish default…
cemerick
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16
votes
2 answers
Why can't I shutdown my own ExecutorService under a SecurityManager?
Under the default security manager, if I create an ExecutorService (ThreadPoolExecutor in this case), I cannot shut it down, shutdown() just calls checkPermission("modifyThread") and thus immediately dies:
import java.util.concurrent.*;
class A {
…
L̲̳o̲̳̳n̲̳̳g̲̳̳p̲̳o̲̳̳k̲̳̳e̲̳̳
- 12,464
- 4
- 50
- 55
14
votes
3 answers
Enable the Java SecurityManager with AllPermission
I'm trying to get myself familiar with the SecurityManager but even this simple scenario fails. When I run the following from inside my IDE or from command line I get the following exception;
access denied ("java.util.PropertyPermission" "java.home"…
Karussell
- 17,085
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13
votes
2 answers
Which permission to set, to avoid error with Security-Manager with https-URLS?
In a software for a customer we have to read given URLs to parse their content. Also the customer needs to activate Tomcat-Security-Manager to let Java-Policies control what the program does.
Now, with reading URLs the exception…
Mnementh
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13
votes
2 answers
why java security manager doesn't forbid neither creating new Thread() nor starting it?
do you happen to know explanation why java security manager doesn't forbid creating new threads or starting them? new FileWriter is under security manager, but neither new Thread(), nor threadInstance.start() isn't uneder security manager, and are…
bastiat
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- 2
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12
votes
3 answers
Java Security Manager - What does it check?
This article about Java security says:
Code in the Java library consults the
Security Manager whenever a dangerous
operation is about to be attempted.
So, what does this exactly mean? Say, if I've implemented my own securitymanager and enabled…
RubyDosa
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- 15
12
votes
3 answers
Java Security Manager completely disable reflection
I've been reading quite a lot of questions on Stackoverflow about this question but couldn't quit find a solution or answer for my problem. If there is already one I would be grateful if somebody would give a hint ...
My problem/question is if it…
Bruno
- 894
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- 32
12
votes
2 answers
SecurityException from I/O code in a parallel stream
I have no way to explain this one, but I found this phenomenon in somebody else's code:
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.util.stream.Stream;
import org.junit.Test;
public…
Hakanai
- 12,010
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- 132
12
votes
1 answer
java.security vs javax.security
I'm a little confused with how Java (6+) distributes its security framework. On one hand, you have the following packages (and their respective subpackages & types):
java.security.*
javax.security.*
And on the other hand you have…
IAmYourFaja
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- 756
12
votes
3 answers
mockito vs sealed packages
I'm working on a project with heavy security constraints.
A requirement is to seal our jars.
Since we sealed jars, a lot of our junit-tests failed with the following error :
java.lang.SecurityException: sealing violation: package…
Syrdek
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- 4