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File folder permissions for Linux web server (Amazon EC2)

Posted on 2014-01-05
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Last Modified: 2014-01-06
hi guys

I have a web server in the cloud hosted with Amazon cloud. It's a linux server.

Not long ago, the website was badly compromised due to flaws in the PHP code. So the hacker was able to 'inject' some sort of code and was able to make changes to the php file.

The security holes in the PHP code have been patched. However, we're still worried of something like that happening in the future.

As it stands, the files and folders on the public facing side seem to have the 775 permissions. The owner of this group is the actual EC2-user, which is the default user. However you can only access the files/folders as this user if you have a special private key, otherwise you can't (well, the hacker evidently did when the site was vulnerable).

Question is, if this was you, how would you tighten the security? Would you create a new user and set all files and folders on the public side to have 755 permissions and make that user the owner of those files/folders?

thank you
Yash
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Question by:Yashy
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by:Duncan Roe
ID: 39757895
If you can get in as owner, you can always change permissions. Do the files need to be group-writable? They should only be group writable if it's actually necessary.
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by:Yashy
ID: 39758040
The don't need to be group writeable no.

Point is, the new user I create will be given to our developers. So in terms of ownership, what would you change? (if i'm being too vague, let me know what you need and I'll provide more info)

THanks
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Accepted Solution

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Duncan Roe earned 500 total points
ID: 39758684
As root, I would do a chown -R on the system so all the files belong to the newly created user. Still no need for group write I should think.
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