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Groups > linux.debian.user > #194935

Re: encryption

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On Sat 21 Apr 2018 at 19:14:06 (+0100), Brian wrote:
> On Sat 21 Apr 2018 at 11:36:05 -0500, David Wright wrote:
> 
> > On Fri 20 Apr 2018 at 20:38:48 (+0100), Brian wrote:
> > > T have a script. It contains an important password.
> > 
> > If you   cat /usr/local/bin/myscript   do you see your important
> > password on the screen?
> 
> With the unencrypted file - yes. With the encrypted file -no.
> > 
> > > I have encrypted the script with
> > > 
> > >   scrypt [enc] -t 10 /usr/local/bin/myscript
> > > 
> > > I can, of course, decrypt it with
> > > 
> > >   scrypt dec /usr/local/bin/myscript
> > > 
> > > and then execute the script.
> > > 
> > > The two last steps have been combined into
> > > 
> > >   DECRYPT=$(scrypt dec /usr/local/bin/myscript) && eval "$DECRYPT"
> > > 
> > > Should I have any more concerns with this command than I have with the
> > > two-step process?
> > 
> > If so, then won't the password be revealed by ps while eval is
> > evaluating it?
> 
> I do not know the most efficacious way to see the ps output in real time
> as eval runs. With a bit of trial and error (scrypt is slow enough to
> switch to another console and use ps) I captured
> 
> 23266 pts/7    R+     0:00 mpw -q -F     -M                                       -t     railcard
> 
> in its output. mpw is the basic command executed by myscript. Switches
> are shown but not parameters. -M is the very important one. The gap
> would be occupied by the passphrase.
> 
> Is it possible that ps output does not show parameters to switches?

Not AFAIK. Here, I can see lines in the list such as:

 1247 ?    Ss 0:00 wpa_supplicant -B -i wlp2s0 -c /var/lib/wicd/configurations/44xxfcxxxxxx -Dwext
 1706 tty1 S  0:00 xterm -geometry 110x38+0+0 -fn neep-iso10646-1-18 -xrm *Page: 3 1

As you can see, I've mangled the MAC of my router that would be revealed otherwise.

And I wouldn't like to rely on winning a race with ps to avoid capture
of information exposed in my command lines.

Cheers,
David.

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encryption Brian <ad44@cityscape.co.uk> - 2018-04-20 21:40 +0200
  Re: encryption Greg Wooledge <wooledg@eeg.ccf.org> - 2018-04-20 22:00 +0200
  Re: encryption David Christensen <dpchrist@holgerdanske.com> - 2018-04-21 02:10 +0200
    Re: encryption Brian <ad44@cityscape.co.uk> - 2018-04-21 17:30 +0200
      Re: encryption john doe <johndoe65534@mail.com> - 2018-04-21 17:40 +0200
        Re: encryption David Christensen <dpchrist@holgerdanske.com> - 2018-04-21 22:00 +0200
          Re: encryption john doe <johndoe65534@mail.com> - 2018-04-22 08:30 +0200
            Re: encryption David Christensen <dpchrist@holgerdanske.com> - 2018-04-22 20:30 +0200
      Re: encryption Glenn English <ghe2001@gmail.com> - 2018-04-21 19:00 +0200
        Re: encryption David Christensen <dpchrist@holgerdanske.com> - 2018-04-21 22:30 +0200
      Re: encryption David Christensen <dpchrist@holgerdanske.com> - 2018-04-21 21:50 +0200
        Re: encryption David Wright <deblis@lionunicorn.co.uk> - 2018-04-22 18:20 +0200
          Re: encryption Brian <ad44@cityscape.co.uk> - 2018-04-22 18:50 +0200
            Re: encryption David Wright <deblis@lionunicorn.co.uk> - 2018-04-23 10:50 +0200
              Re: encryption Brian <ad44@cityscape.co.uk> - 2018-04-23 13:20 +0200
                Re: encryption David Wright <deblis@lionunicorn.co.uk> - 2018-04-24 20:50 +0200
  Re: encryption David Wright <deblis@lionunicorn.co.uk> - 2018-04-21 18:40 +0200
    Re: encryption Brian <ad44@cityscape.co.uk> - 2018-04-21 20:20 +0200
      Re: encryption David Wright <deblis@lionunicorn.co.uk> - 2018-04-21 21:00 +0200
        Re: encryption Brian <ad44@cityscape.co.uk> - 2018-04-21 21:20 +0200
          Re: encryption David Christensen <dpchrist@holgerdanske.com> - 2018-04-21 23:30 +0200
          Re: encryption David Wright <deblis@lionunicorn.co.uk> - 2018-04-22 04:30 +0200
            Re: encryption Curt <curty@free.fr> - 2018-04-22 11:20 +0200
              Re: encryption Reco <recoverym4n@gmail.com> - 2018-04-22 11:50 +0200
                Re: encryption Brian <ad44@cityscape.co.uk> - 2018-04-22 19:10 +0200
      Re: encryption David Christensen <dpchrist@holgerdanske.com> - 2018-04-21 22:50 +0200
    Re: encryption David Christensen <dpchrist@holgerdanske.com> - 2018-04-21 22:10 +0200
      Re: encryption David Wright <deblis@lionunicorn.co.uk> - 2018-04-22 04:00 +0200
        Re: encryption Brian <ad44@cityscape.co.uk> - 2018-04-22 17:40 +0200
          Re: encryption Richard Hector <richard@walnut.gen.nz> - 2018-04-23 08:00 +0200
            Re: encryption Andrew McGlashan <andrew.mcglashan@affinityvision.com.au> - 2018-04-23 09:00 +0200
        Re: encryption David Christensen <dpchrist@holgerdanske.com> - 2018-04-22 20:10 +0200

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