How to get the output of java apps in a php web script?

Question

I have written a Java application that runs from the command line. I want to allow users to access this via a simple PHP web interface - it'll just allow them to specify certain parameters, and then execute the java app and return the output.

For some reason, I'm getting a 'Permission Denied' error message when I try to do anything with Java, even something as simple as:

shell_exec('/usr/bin/java -version 2>&1');

returns 'sh: /usr/bin/java: Permission denied ' when run through a browser.

If I give apache a shell account and log in as apache, I can execute this command fine.

Is there some kind of setting preventing the JVM running if there is no associated tty? How can I get this to work? I'm running PHP 5.3.2.

Thanks

Yes - I just ran 'whoami' in the script and it reported 'apache'. — Michael Jones
– Michael Jones, Commented Aug 2, 2010 at 9:37
safe_mode is off and the error comes from sh, so something executes (this info was on an answer that I deleted, I put it here so it doesn't get lost) — Vinko Vrsalovic
– Vinko Vrsalovic, Commented Aug 2, 2010 at 9:47

sarnold · Accepted Answer · 2010-08-02 09:46:41Z

3

Your application host may be confined with a tool like AppArmor or SELinux or TOMOYO or SMACK, or similar confinement tools.

It would be very simple to confine an Apache to allow executing /usr/bin/whoami but not /usr/bin/java.

Ask your system administrator to grant access to java and your jars for you.

answered Aug 2, 2010 at 9:46

sarnold

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2 Comments

Vinko Vrsalovic Over a year ago

They usually leave a log on unauthorized accesses... in case he's the admin he should look for them

Michael Jones Over a year ago

Thanks a lot. Yes, SELinux was the problem. I wouldn't have thought of that. Thanks.

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