12-09-2013
It's worse than that -- the program runs the code through sh ultimately, so substituting a false sh can get the code directly.
Many people have been down this road before. Rube goldberg machines are not and cannot be the solution.
In short, if you don't want the customer to see the code, you can try either
1) Don't give it to them -- make it a service they access over the network
or
2) Put it on a machine you control, where they do not have root, and deny them access via file access permissions and isolate it further with sudo.
You cannot expect to protect a program by encryption when, by definition, the program contains the necessary code to decrypt itself in unencrypted form.
You cannot expect to protect anything run in plaintext from root.
If you rewrote your application in a language like C, decoding it would be a lot harder since quite a lot of information is thrown away in the compiling/linking process.
Last edited by Corona688; 12-09-2013 at 11:45 AM..
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LEARN ABOUT CENTOS
amcryptsimple
AMCRYPTSIMPLE(8) System Administration Commands AMCRYPTSIMPLE(8)
NAME
amcryptsimple - reference simple crypt program for Amanda symmetric data encryption
SYNOPSIS
amcryptsimple to be called by Amanda only
DESCRIPTION
amcryptsimple calls gpg to perform symmetric data encryption on Amanda backup. amcryptsimple will search for the gpg program in the
following directories: /usr/local/bin:/usr/bin:/usr/sbin:/bin:/sbin
amcryptsimple uses one passphrase to encrypt the Amanda data and uses the same passphrase to decrypt the Amanda backup data. amcryptsimple
uses AES256 as the symmetric cipher.
HOW TO CREATE PASSPHRASE
Store the passphrase inside the home-directory of the Amanda user ($amanda_user) and protect it with proper permissions:
echo my_secret_passphrase > ~$amanda_user/.am_passphrase
chown $amanda_user:disk ~$amanda_user/.am_passphrase
chmod 700 ~$amanda_user/.am_passphrase
NOTES
Choose a good passphrase and protect it properly. Backup data can only be restored with the passphrase. There is no backdoor.
If storing and securing passphrase in your environment presents challenges, Amanda provide public-key data encryption through amgpgcrypt.
Public-key encryption uses the public key to encrypt and uses the private key to decrypt.
SEE ALSO
amanda(8), amanda.conf(5), amcrypt(8), amgpgcrypt(8), amrestore(8), gpg(1)
The Amanda Wiki: : http://wiki.zmanda.com/
AUTHOR
Kevin Till <kevin.till@zmanda.com>
Zmanda, Inc. (http://www.zmanda.com)
Amanda 3.3.3 01/10/2013 AMCRYPTSIMPLE(8)