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Full Discussion: chmod 777 security risks?
Top Forums UNIX for Dummies Questions & Answers chmod 777 security risks? Post 302097261 by Gary777 on Wednesday 22nd of November 2006 11:13:49 PM
Old 11-23-2006
Thanks Blowtorch

Thanks for the reply Blowtorch,

I am still not clear about the answer though... Lets say someone broke into my garage and the files were not chmod'ed 666 or 777, (all files are 644 right now) are you saying that all they can do is look around and read files? But if the files were 666 or 777 they could do whatever they want to?

Are you also saying that it's possible to gain access to public_html (for instance) but not the root directories?

Ok, regarding my partner, he is not computer savvy but he knows a little HTML, SnippetMaster allows users to "edit LIVE html in the page" from their browser, you can define "snippet" areas within a page that are editable, there are different user levels where you can set different rights/areas that they can edit (it's actually very cool!) The user doesn't need to know; how to use FTP, how to upload or how to do other backend tasks, they just log-in and edit parts of a live page in a WYSIWYG editor within their browser. I use a lot of SSI, PHP, JS and CGI code on our web site and it's possible he could really mess things up if he has upload access.

Lastly, let me ask a question, should I absolutely not chmod 666 or 777 my .shtml and .html files? I guess I could chmod only the base html files that I include via SSI but that means a LOT more work for me...

Happy Holidays!

Gary
 

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CHMOD(3)								 1								  CHMOD(3)

chmod - Changes file mode

SYNOPSIS
bool chmod (string $filename, int $mode) DESCRIPTION
Attempts to change the mode of the specified file to that given in $mode. PARAMETERS
o $filename - Path to the file. o $mode - Note that $mode is not automatically assumed to be an octal value, so to ensure the expected operation, you need to prefix $mode with a zero (0). Strings such as "g+w" will not work properly. <?php chmod("/somedir/somefile", 755); // decimal; probably incorrect chmod("/somedir/somefile", "u+rwx,go+rx"); // string; incorrect chmod("/somedir/somefile", 0755); // octal; correct value of mode ?> man 1 chmod' and ' man 2 chmod'. <?php // Read and write for owner, nothing for everybody else chmod("/somedir/somefile", 0600); // Read and write for owner, read for everybody else chmod("/somedir/somefile", 0644); // Everything for owner, read and execute for others chmod("/somedir/somefile", 0755); // Everything for owner, read and execute for owner's group chmod("/somedir/somefile", 0750); ?> RETURN VALUES
Returns TRUE on success or FALSE on failure. NOTES
Note The current user is the user under which PHP runs. It is probably not the same user you use for normal shell or FTP access. The mode can be changed only by user who owns the file on most systems. Note This function will not work on remote files as the file to be examined must be accessible via the server's filesystem. Note When safe mode is enabled, PHP checks whether the files or directories you are about to operate on have the same UID (owner) as the script that is being executed. In addition, you cannot set the SUID, SGID and sticky bits. SEE ALSO
chown(3), chgrp(3), fileperms(3), stat(3). PHP Documentation Group CHMOD(3)
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