Runas using open

slloyd has asked for the wisdom of the Perl Monks concerning the following question:

I am trying to pass in the password to the runas program. Shouldn't this work?

my $exe='myprogram.exe';
my $user='tester';
my $pass='lab';
my $cmd=qq|runas /profile /user:$user "$exe"|;
open(FH,"| $cmd")  || die $^E;
print FH $pass;
close(FH);
[download]

It does not seem to be sending the password. I get the following output:

H:\Products\Sandbox>runas.pl
Enter the password for tester:
Attempting to start myprogram.exe as user "GUYBOX\tester" ...
RUNAS ERROR: Unable to run - myprogram.exe
1326: Logon failure: unknown user name or bad password.
[download]

What am I doing wrong?

http://www.basgetti.com

Comment on Runas using open Select or Download Code

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Re: Runas using open by BrowserUk (Patriarch) on Jun 12, 2005 at 02:28 UTC
runas.exe does not read passwords from stdin. It uses a call, CredUICmdLinePromptForCredentials() from a system dll that accesses the console directly. I assume that this is designed as a security measure. You may be able to use Win32::Console to obtain a handle to the current console and the WriteInput() method to drive the program. This is an untested idea. Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal? "Science is about questioning the status quo. Questioning authority". The "good enough" maybe good enough for the now, and perfection maybe unobtainable, but that should not preclude us from striving for perfection, when time, circumstance or desire allow.	[reply]
Re^2: Runas using open by slloyd (Hermit) on Jun 12, 2005 at 04:46 UTC
Till now, I have never used Win32::Console. I tried a bunch of things but could not get anything to work... http://www.basgetti.com	[reply]
Re: Runas using open by Zaxo (Archbishop) on Jun 12, 2005 at 02:09 UTC
This is probably from some form of command line interpretation doing unexpected things. Stick a `print $cmd, "\n";` in there to see what you get, and try pasting that into the command line to see what happens. It might fix things to construct the command as an array and use the list form of 3+ arg open. After Compline, Zaxo	[reply] [d/l]
Re: Runas using open by monarch (Priest) on Jun 12, 2005 at 02:07 UTC
Did you just ask this question before? Perhaps it's best to wait for an appropriate answer in that thread?	[reply]