Re: [PLUG] shell script help...

["Mag Gam" <magawake@gmail.com>]

Wow..didn't think about this.
B. Subshell, invoked with invalid or non-existant history file
        $ HISTFILE="" bash
                {nefarious commands...}
        $ exit
        $ logout

On 9/1/07, Matthew Rosewarne <mukidohime@case.edu> wrote:

On Saturday 01 September 2007, Mag Gam wrote:
> I am in the process of writing a shell script to take history file (fc -l)
> and backup it up, while appending it.
>
> My strategy is, once the user exits out of his shell, i will dump the
> history into a file by using a trap() with EXIT. The file will be appended
> by the username... (ie, username.history.date

I would not attempt to rely on this for any measure of security, as it can be
easily circumvented by users.  For example, one could:

A: Subshell, then remove the history file
        $ bash
                {nefarious commands...}
        $ exit
        $ rm ~/.bash_history
        $ logout

B. Subshell, invoked with invalid or non-existant history file
        $ HISTFILE="" bash
                {nefarious commands...}
        $ exit
        $ logout

All of this could just as easily be hidden in a script, making it very
difficult to catch.  It would be a better idea to use IDS/auditing software
than to rely on something controlled by the user.

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___________________________________________________________________________
Philadelphia Linux Users Group         --        http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion  --   http://lists.phillylinux.org/mailman/listinfo/plug