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Running COM WScript.Shell on PHP IIS6 Windows Server 2003

Posted on 2011-03-17
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Last Modified: 2012-05-11
I am trying to run the following PHP code on a Windows Server 2003 with II6 running php as isapi to convert pdfs to swfs.

<?php
flush();

echo "This is a test<br><Br>";
$software_path ="C:\\SWFTools\pdf2swf.exe" ;
$pdf_path ="D:\\Book\DMC\php\Test\PDF\\1.pdf" ;

$argument = "-o";
$swf_output ="D:\Book\DMC\php\Test\SWF\\1.swf" ;

$cmd =" $software_path $pdf_path $argument $swf_output";
echo $cmd;
$WshShell = new COM("WScript.Shell") or die("Could not start WScript");


$oExec = $WshShell->Run("cmd /C $cmd ", 0, false);
?>

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I receive a 500 error when running the code. When I comment out
//$oExec = $WshShell->Run("cmd /C $cmd ", 0, false);

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the code will run without the error, but of course the command is not exicuted.

$cmd echos to:

C:\SWFTools\pdf2swf.exe D:\Book\DMC\php\Test\PDF\1.pdf -o D:\Book\DMC\php\Test\SWF\1.swf

which does work perfecty in the command prompt.

I have tried other sample codes as well that try to run from the cmd promt, and get a 500 error. I have never needed to interface with the cmd propt with php before so I am not familiar with the requirements.

I did try to give IUSR read / write permissions on the server, but this did not solve the issue.

Thanks for the help.
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Question by:dmccull2000
8 Comments
 
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Expert Comment

by:Shinesh Premrajan
ID: 35164397
Did you tried executing the command using system or exec command.


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Author Comment

by:dmccull2000
ID: 35168776
I tried both with no luck same 500 error. I also tried passthru. Passthu does not receive a 500 error but it is also not exicuted.
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LVL 15

Expert Comment

by:pcsmitpra
ID: 35230766
Check the user (Identity) for the application pool holding the website for PHP Website. Go to c:\WINDOWS\system32\cmd.exe and add that user here with 'Execute' permissions. Try now it with your page.
PS: - It is RISKY.
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Accepted Solution

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Ron M earned 500 total points
ID: 35233058
Try adding the following to your web config

<identity impersonate="true" userName="Administrator" password="yourpass"/>


This will make IIS impersonate administrator when launching processes.  It would be preferrable to use a service account with admin privilages though.
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Author Comment

by:dmccull2000
ID: 35233503
Thank you, both solutions worked on the test environment. I can see how this can be very risky to the security of the server. Now to find a way to do this more securely. Any suggestions would be greatly appreciated.
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LVL 25

Expert Comment

by:Ron M
ID: 35233635
Well your web.config file should not be accessible from IIS.  Access to it is forbidden by default.

One risk is if you create a web process that can be exploited, as it is running under an administrative account.

Another is if you have multiple people with access to logon to the server itself, who can view this file and get the credentials right out of it.

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