topic How to switch user by script? in Operating System - HP-UX

How to switch user by script?

Periandro Saraiva Vaz — Fri, 29 Nov 2002 17:23:48 GMT

Hi friends!

I'm needing to do a script to switch user during a session without inform a password.

I've already tried to use expect, but there's a problem:
I don't get work interactive in new passord, because expect nedd a answer for each action.

Example:

$ expect
expect1.1> spawn su - i67844
spawn su - i67844
17383

expect1.2> expect "Password:"
Password: expect1.3> send "nova2002\r"

expect1.3> exit

So, when i go out of expect, I don't get to switch user.

I hope that you understand me.

Thank you!!!
Periandro Saraiva Vaz

Re: How to switch user by script?

Ralph Grothe — Fri, 29 Nov 2002 17:36:46 GMT

If you are willing to do your stuff with Perl it would be as easy as assignments to the special vars that represent EUID, UID, EGID, GID
(read "perldoc perlvar")

e.g.

$> = $<;

or

($>, $<) = ($<, $>);

$> # is EUID
$< # is UID
$) # is EGID
$( # is GID

(or "use English", see "perldoc English")

...provided you started your script with sufficient privileges (or have it run with suid bit set).

You also can easily fork() and exec() where you swap IDs for the child to restrict possible damage.

Read "perldoc perlipc"

Btw, there is even an Expect.pm at CPAN
http://www.cpan.org/modules/by-module/Expect/

Re: How to switch user by script?

harry d brown jr — Sun, 01 Dec 2002 04:22:34 GMT

have you tried "sudo" ??

http://hpux.cs.utah.edu/hppd/hpux/Sysadmin/sudo-1.6.6/

live free or die
harry

Re: How to switch user by script?

Periandro Saraiva Vaz — Mon, 02 Dec 2002 17:10:49 GMT

Hi Harry,

I didn't try to use a sudo because I don't know it. Do you have an example to solve my problem?

Is there a way to solve using a table of "user's equivalence"?

Re: How to switch user by script?

Bill Cahill — Thu, 05 Dec 2002 14:49:29 GMT

If you enable the second user to be remsh'd, then you can use that.

For second user, in .rhosts add
hostname username

Then in your script, remsh to your own hostname as the second user.

eg: rlogin `hostname` -l seconduser

We use this to let oracle become applmgr in our oracle financials environment. This is acceptable because oracle is a "higher" privileged user than applmgr.

Re: How to switch user by script?

harry d brown jr — Thu, 05 Dec 2002 15:15:01 GMT

Periandro,

http://www.onlamp.com/lpt/a/2704

live free or die
harry