How to hide from UNIX strings - obfuscate or hide a literal or constant?
Hi,
I need to somehow pipe the password to a command and run some SQL, for example, something like echo $password | sqlplus -s system @query01.sql
To make it not so obvious, I decided to try out writing a small C program that basically just do echo $password. So now I just do x9.out | sqlplus -s system@query01.sql.
I understand it still is not a secure thing to do as someone can just run x9.out and knows the password. Anyway, the intent is to make is less obvious that I am echo'ing a password so I am more than happy with that for the time being as a start.
The very, very simple C program is a below:
Unfortunately, as you can see if I do a strings of the x9.out file, it is quite obvious that the word hello stands out.
Can anyone please advise how I can somehow hide that word in the bushes ?
For example, maybe I can do a printf of the ASCII values of the word so that if anyone do a strings of it, it shows number instead of words.
Finally, eventually, I would want to put something more into the code so that it will be an array that stores a list of username+password, so that if I do x9.out user01 it prints the password of user01, x9.out user02 prints the password of user02 and so on. It will probably be wise that it prompts for a username/password before it allows me to display the information.
BTW, it would be nice if I can put the whole "echo $password | sqlplus -s system" string into the C program so that I only do x9.out @query01.sql so it hides the username and password. I don't see how that they can be done, maybe one of the gurus can advice how to do that.
Anyway for now, I just want to know how to hide from UNIX strings :-)
Last edited by newbie_01; 03-08-2014 at 05:41 AM..
Reason: Adding more info
Wipe it out means something like this:
No matter how it got there, after the string is built you have "hello" sitting in core. Don't let it sit for long.
I don't understand your second question at all. The whole purpose of that script is to read a password that a human types in. That is the only way to have true security. It is always possible to reverse engineer a program that secretly builds a password and discover what that password is.
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