[Mono-bugs] [Bug 653564] New: Erroneous value returned by Environment.UserName when running as root with su

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=653564

https://bugzilla.novell.com/show_bug.cgi?id=653564#c0


           Summary: Erroneous value returned by Environment.UserName when
                    running as root with su
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.8.x
          Platform: All
        OS/Version: openSUSE 11.3
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: CORLIB
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: djechelon at fastwebnet.it
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; it; rv:1.9.2.12)
Gecko/20101026 SUSE/3.6.12-1.2 Firefox/3.6.12

Hello,

I wanted to implement a simple root check in C# for console programs.
I tried to get the System.Environment.UserName value, but I found that it
doesn't always return what I expect when running the program after privileges
elevation (the recommended practice instead than logging in as root in the
first place)

If I run the program logging with elevated privileges using sudo, I get the
correct value, but if I first perform su and then run the program, I get my
regular user's name.

Reproducible: Always

Steps to Reproduce:
Play with the following code:

public static void Main (string[] args)
        {
            Console.WriteLine ("I am: {0}",Environment.UserName);
        }
Actual Results:  
djechelon at MONSTR:~/Mono/Hello/Whoami/bin/Debug> mono Whoami.exe
I am: djechelon #CORRECT
djechelon at MONSTR:~/Mono/Hello/Whoami/bin/Debug> sudo mono Whoami.exe
root's password:
I am: root #CORRECT
djechelon at MONSTR:~/Mono/Hello/Whoami/bin/Debug> su
Password: 
MONSTR:/home/djechelon/Mono/Hello/Whoami/bin/Debug # mono Whoami.exe
I am: djechelon #WRONG

Expected Results:  
djechelon in the first run, root in the others

A possible workaround may involve the usage of whoami command with Process
class

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