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Full Discussion: Make a password protected bash script resist/refuse “bash -x” when the password is given
Top Forums Shell Programming and Scripting Make a password protected bash script resist/refuse “bash -x” when the password is given Post 302878877 by Corona688 on Monday 9th of December 2013 10:39:26 AM
Old 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

amgpgcrypt

AMGPGCRYPT(8)						  System Administration Commands					     AMGPGCRYPT(8)

NAME

       amgpgcrypt - reference crypt program for Amanda public-key data encryption

SYNOPSIS

       amgpgcrypt  to be called by Amanda only

DESCRIPTION

       amgpgcrypt calls gpg to perform public-key data encryption on Amanda backup.  amgpgcrypt will search for the gpg program in the following
       directories: /usr/local/bin:/usr/bin:/usr/sbin:/bin:/sbin

       amgpgcrypt sets GNUPGHOME to $AMANDA_HOME/.gnupg where gpg will look for the gpg keys.  amgpgcrypt uses the public key to encrypt the
       Amanda data and uses the private key to decrypt the Amanda backup data. Thus, passphrase is only required at the time of data restore.

KEY AND PASSPHRASE

       amgpgcrypt uses the private key to decrypt Amanda backup data.

       It is very important to store, manage and  protect the key and the passphrase properly. Encrypted backup data can only be recovered with
       the correct key and passphrase.

HOW TO CREATE ENCRYPTION KEYS AND PASSPHRASE FOR AMGPGCRYPT

       Store the passphrase that you used in following "gpg --gen-key" command 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

       Run "gpg --gen-key". Below is an example:
       $ gpg --gen-key
       gpg (GnuPG) 1.2.6; Copyright (C) 2004 Free Software Foundation, Inc.
       This program comes with ABSOLUTELY NO WARRANTY.
       This is free software, and you are welcome to redistribute it
       under certain conditions. See the file COPYING for details.

       Please select what kind of key you want:
	  (1) DSA and ElGamal (default)
	  (2) DSA (sign only)
	  (4) RSA (sign only)
       Your selection? 1
       DSA keypair will have 1024 bits.
       About to generate a new ELG-E keypair.
		     minimum keysize is  768 bits
		     default keysize is 1024 bits
	   highest suggested keysize is 2048 bits
       What keysize do you want? (1024)
       Requested keysize is 1024 bits
       Please specify how long the key should be valid.
		0 = key does not expire
	     (n)  = key expires in n days
	     (n)w = key expires in n weeks
	     (n)m = key expires in n months
	     (n)y = key expires in n years
       Key is valid for? (0) 6m
       Key expires at Sun 06 Aug 2006 03:51:25 PM PDT
       Is this correct (y/n)? y

       You need a User-ID to identify your key; the software constructs the user id
       from Real Name, Comment and Email Address in this form:
	   "Heinrich Heine (Der Dichter) (heinrichh@duesseldorf.de)"

       Real name: amandabackup
       Email address:
       Comment: gpg keys for amandabackup
       You selected this USER-ID:
	   "amandabackup (gpg keys for amandabackup)"

       Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? o
       You need a Passphrase to protect your secret key.

       We need to generate a lot of random bytes. It is a good idea to perform
       some other action (type on the keyboard, move the mouse, utilize the
       disks) during the prime generation; this gives the random number
       generator a better chance to gain enough entropy.

       We need to generate a lot of random bytes. It is a good idea to perform
       some other action (type on the keyboard, move the mouse, utilize the
       disks) during the prime generation; this gives the random number
       generator a better chance to gain enough entropy.

       public and secret key created and signed.
       key marked as ultimately trusted.

       pub  1024D/4417A8CB 2006-02-07 amandabackup (gpg keys for amandabackup)
	    Key fingerprint = 139C 6369 44FC 7F1A 655C	E5E9 7EAA 515A 4417 A8CB
       sub  1024g/8C3A6A78 2006-02-07 [expires: 2006-08-06]

FILES

       $AMANDA_HOME/.gnupg/pubring.gpg
	   The public key.  amgpgcrypt encrypt data with this public key along with the cipher algorithm.

       $AMANDA_HOME/.gnupg/secring.gpg
	   The private/secret key. It's only needed during amrecover/amrestore. Store and protect it properly during other time.

       $AMANDA_HOME/.am_passphrase
	   The passphrase. It's only needed during amrecover/amrestore. Store and protect it properly during other time.

BUGS

       Amanda has problem with gpg mdc(modification detection code) in the binary mode.  amgpgcrypt calls gpg with mdc disabled

SEE ALSO

       amanda(8), amanda.conf(5), amcrypt(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							     AMGPGCRYPT(8)
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