From owner-freebsd-questions  Tue May 28 15:28:11 2002
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From: "Daniel Blankensteiner" <db@traceroute.dk>
To: "Jonathan Chen" <jonc@chen.org.nz>
Cc: <freebsd-questions@freebsd.org>
References: <005401c2068a$35c1ebf0$6800a8c0@rafter> <20020529100157.B60716@grimoire.chen.org.nz>
Subject: Re: I386<<FreeBSD 4.5<<getlogin()
Date: Wed, 29 May 2002 00:28:21 +0200
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----- Original Message -----
From: "Jonathan Chen" <jonc@chen.org.nz>
> On Tue, May 28, 2002 at 10:56:54PM +0200, Daniel Blankensteiner wrote:
> > I have found a weird problem using getlogin() or maybe it is just me
that
> > is weird ;-)
>
> [...]
> > db# su testuser
> > ~% whoami
> > testuser
> > ~% ./test
> > You are logged in as: root
> > Your group number is: 1000
> > Your uid is: 1000
> > What is going on? If I ssh to the computer and log in as testuser, the
> > program
> > works fine. Programs(proccess) that change user and use getlogin() may
have
> > a security problem or am I just missing som "su" info?
> > btw what is the difference between a real and effective user?
>
> getlogin() is working fine. You should be using getuid(2) and geteuid(2)
> to determine real and effective user.

But why does getlogin() give me "root", when I have su'ed to testuser?
And what is the difference between a real and effective user?

br
db


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