Question regardin deleting a file in /tmp directory

Question regardin deleting a file in /tmp directory

[Mário Gamito]

Hi,

I have this PHP script (simplificated here), called delete_tmp.php
that basically calls external commands:

<?php

$session_file = '/tmp/sess_89765'

system(''rm -f' . ' ' . $session_file);

?>

delete_tmp.php file is owned by gamito.users

/tmp/sess_89765 file has permissions -rw------ and is owned by gamito.users

My /tmp permissions are rwxrwxrwt and is owned by root.root

I know that the the sticky bit only allows files to be deleted by
their owners, the owner of the directory or by root.

Never the less, i can switch to /tmp directory and delete sess_89765
file as user gamito.

If I run:
$ php delete_tmp.php

as root, it deletes sess_89765 file.

But if I do the same has user gamito, it doesn't delete the file !!!

Ideas ?

Any help would be appreciated.

Warm Regards,
Mário Gamito
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Re: Question regardin deleting a file in /tmp directory

[Jose Celestino]

Words by Mário Gamito [Fri, Mar 28, 2008 at 03:23:37PM +0000]:
> Hi,
> 
> I have this PHP script (simplificated here), called delete_tmp.php
> that basically calls external commands:
> 
> <?php
> 
> $session_file = '/tmp/sess_89765'
> 
> system(''rm -f' . ' ' . $session_file);
> 
> ?>
> 
> delete_tmp.php file is owned by gamito.users
> 
> /tmp/sess_89765 file has permissions -rw------ and is owned by gamito.users
> 
> My /tmp permissions are rwxrwxrwt and is owned by root.root
> 
> I know that the the sticky bit only allows files to be deleted by
> their owners, the owner of the directory or by root.
> 
> Never the less, i can switch to /tmp directory and delete sess_89765
> file as user gamito.
> 
> If I run:
> $ php delete_tmp.php
> 
> as root, it deletes sess_89765 file.
> 
> But if I do the same has user gamito, it doesn't delete the file !!!
> 
> Ideas ?
> 

Yes, remove the -f.

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Jose Celestino
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Re: Question regardin deleting a file in /tmp directory

[Adam Bowen]

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Hi,

Mário Gamito wrote:
> If I run:
> $ php delete_tmp.php

Is this the CGI or CLI version of php that you are running (php 
--version)?  (You can create a standalone version of both, I know, I 
have the empty follicles to prove it).  The CGI version has extra 
restrictions that may cause weirdness.  As a test I would try doing an 
ls of the file before the rm and see what the output of that is.

Cheers

Adam

> as root, it deletes sess_89765 file.
> 
> But if I do the same has user gamito, it doesn't delete the file !!!
> 
> Ideas ?
> 
> Any help would be appreciated.
> 
> Warm Regards,
> Mário Gamito
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> To unsubscribe from this list: send the line "unsubscribe linux-admin" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html



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