Different actions on different passwords?
rgm at htt-consult.com
Tue Dec 31 01:09:21 UTC 2013
On 12/30/2013 08:03 PM, Bill Oliver wrote:
> On Tue, 31 Dec 2013, Patrick O'Callaghan wrote:
>> On Mon, Dec 30, 2013 at 11:25 PM, Bill Oliver <vendor at billoblog.com>
>> In linux, is it possible to dictate two different actions upon
>> login with different passwords?
>> Short answer: no.
>> Longer answer: in computing almost anything is possible if you really
>> want to achieve it. Given that on Unix-style systems, including
>> Linux, the login program can be changed, you can modify the source
>> to do what you want. Of course you'll need to have superuser
>> privileges to install it in place of the system standard. Note that
>> doing this may well open a can of worms, e.g. you might have to modify
>> the format of the password file (and hence the library routines that
>> access it), possibly fiddle with SElinux settings, etc. etc.
>> If the conditions are relaxed slightly you can get a partial solution
>> using the standard login: write a Shell startup script (.profile or
>> whatever) that allows the user to discriminate between the two
>> modes, e.g. by using a timeout, detecting the initial state of the
>> Shift (or Control or whatever) key etc., in a way that is hopefully
>> non-obvious to an observer. Probably not reliable enough for
>> serious use.
>> Conclusion: better look for some other way to cover your tracks, and
>> note that a forensic investigation can be carried out without having
>> you log in at all.
> Yeah, that's what I thought. I'm a little surprised that there hasn't
> been a variant of linux developed for areas with intrusive government
> surveillance. I recently noticed that the government of Venezuela has
> a government-developed distro (Canaima); think there's some back doors
> in that? One would think that there would be a movement to provide
> anti-governmental variants.
> I know there's no perfect security. Back in the day, I had an
> acquaintance whose job was to break into houses and install keyloggers
> on machines in people's homes. Of course that was back when we still
> believed in silly things like search warrants.
> Sigh. I guess I'll just have to continue keeping my plans for world
> domination on my brother-in-law's computer... (Just kidding, NSA).
One approach is to put your important stuff on an encrypted partition
that is not auto mounted. Mount it only when needed, then unmount it.
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