Run bash script to create file in PHP

Question

In addition to my previous question, another problem appeared and I decided to make a new question for it:

I am currently calling a php script that than runs a bash script. The php script looks like:

chdir('/home/');
$output = shell_exec('./do.sh');
echo "<pre>$output</pre>";

The do.sh contains:

#! /bin/bash

echo 12;
dd if=/dev/urandom of=test.test bs=1048576 count=2

The problem is following:

When I call ./do.sh from the terminal everything works fine: test.test is created and the ouput is 12

However, when I call it from my php file, the output is 12 aswell, but no file is being created. Since I know almost nothing about bash scripting, I have no idea why this is happening...

That would probably be because the user that PHP is running as does not have write permissions on the /home/ directory. You will have to chmod nnn /home where nnn is the appropriate permissions structure - remember to make it as restrictive as possible. You might want to look at the ownership and group memberships to get the best setup. To test you can chmod 777 /home, and if it works then you have your answer. — DaveRandom
– DaveRandom, Commented Jun 15, 2012 at 15:18
Thanks a lot! I did forget to put the correct permissions for the home folder. I only thought about the actual php file and changed its permission, but didnt do the same for the folder it is in! I hope you dont mind me marking @dAm2K ´s answer, since he also suggested to look at the permissions! — r0skar
– r0skar, Commented Jun 15, 2012 at 15:26

dAm2K · Accepted Answer · 2012-06-15 15:19:44Z

3

Check if PHP safe_mode is enabled. You have to turn it off in your /etc/php.ini file, and obviously check filesystem permissions.

answered Jun 15, 2012 at 15:19

dAm2K

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3 Comments

r0skar Over a year ago

Safe mode is off and the php aswell as the .sh file have all permissions to write. However, I am not sure about the user(see @DaveRandom ´s comment).

dAm2K Over a year ago

Try to use absolute path for dd: /bin/dd if=/dev/urandom of=test.test bs=1048576 count=2

r0skar Over a year ago

It was the permissions after all! Thanks a lot! I did forget to put the correct permissions for the home folder. I only thought about the actual php file and changed its permission, but didnt do the same for the folder it is in!

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