09-10-2009
This is my client's requirement so I cannot question him why he want to do this, I simply have to provide the solution as long as it is not crime by law :-) so it would be better we discuss this purely in technical terms rather than debating if it's appropriate or not.
I am thinking of achieving this by trapping the signal for ENTER (RETURN) key so that I can monitor each command entered by the user and handle them inside my script. I this way when user enters PATH command my script will trigger and handle it inside the script.
Now question is whether there is better way to do this? and How do I TRAP ENTER or RETURN key. Is that possible?
---------- Post updated at 11:59 AM ---------- Previous update was at 11:43 AM ----------
Quote:
Originally Posted by
Annihilannic
Why not simply deny them access if they fail authentication?
Also this is not just the question of denying them access. The users should not be able to change PATH and defeat our purpose for changing their PATH. This is the main requirement (fooling the user is secondary and if that is achieved it will be bonus).
Any clues or pointers?
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SETUID(1) General Commands Manual SETUID(1)
NAME
setuid - run a command with a different uid.
SYNOPSIS
setuid username|uid command [ args ]
DESCRIPTION
Setuid changes user id, then executes the specified command. Unlike some versions of su(1), this program doesn't ever ask for a password
when executed with effective uid=root. This program doesn't change the environment; it only changes the uid and then uses execvp() to find
the command in the path, and execute it. (If the command is a script, execvp() passes the command name to /bin/sh for processing.)
For example,
setuid some_user $SHELL
can be used to start a shell running as another user.
Setuid is useful inside scripts that are being run by a setuid-root user -- such as a script invoked with super, so that the script can
execute some commands using the uid of the original user, instead of root. This allows unsafe commands (such as editors and pagers) to be
used in a non-root mode inside a super script. For example, an operator with permission to modify a certain protected_file could use a
super command that simply does:
cp protected_file temp_file
setuid $ORIG_USER ${EDITOR:-/bin/vi} temp_file
cp temp_file protected_file
(Note: don't use this example directly. If the temp_file can somehow be replaced by another user, as might be the case if it's kept in a
temporary directory, there will be a race condition in the time between editing the temporary file and copying it back to the protected
file.)
AUTHOR
Will Deich
local SETUID(1)