11-14-2016
X Windows Security Issue
Hi there,
I am trying to understanding the difference between X11, host- based versus user-based access controls. And how vulnerability can the X11 settings be and why it is recommended to turn it off.
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LEARN ABOUT DEBIAN
prima::nox11
Prima::noX11(3) User Contributed Perl Documentation Prima::noX11(3)
NAME
Prima::noX11 - Use Prima without X11
SYNOPSIS
use Prima::noX11;
use Prima;
my $error = Prima::XOpenDisplay();
if ( defined $error) {
print "not connected to display: $error
";
} else {
print "connected to display
";
}
DESCRIPTION
Prima will by default connect to X11 server on unix. To use Prima functionality in modules or programs where this default behavior is
undesired, please follow the guidelines below.
No connection
In the beginning of a script or a module that is never intended to connect to X11 display, add this:
use Prima::noX11;
use Prima;
It will be possible to connect to X11 server later on manually.
Manual connect to X11
If connection to X11 is optional, use this code after "use Prima::noX11" was invoked:
my $error = Prima::XOpenDisplay();
if ( defined $error) {
print "not connected to display: $error
";
} else {
print "connected to display
";
}
Checking if GUI functionality is accesiible.
Without X11 connection, no GUI functionality such as screen grabbing will be accessible. In addition to that functionality, windowing
functions will only become accessible after Prima::Application creates a single instance $::application.
Therefore, if $::application is defined, then all GUI functions can be safely used. If, on the contrary, it is not defined, initiate it as
this:
unless ( $::application) {
my $error = Prima::XOpenDisplay();
die $error if defined $error;
require Prima::Application;
import Prima::Application;
}
AUTHOR
Dmitry Karasik, <dmitry@karasik.eu.org>.
SEE ALSO
Prima::X11
perl v5.14.2 2009-02-24 Prima::noX11(3)