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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$ finger yeti
Login: yeti Name: yeti
Directory: /arpa/tz/y/yeti Shell: /bin/ksh
On since Wed Apr 2 15:24 (UTC) on pts/149
Mail last read Mon Mar 31 11:08 2014 (UTC)
No Plan.
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LEARN ABOUT DEBIAN
x11::protocol::connection
Protocol::Connection(3pm) User Contributed Perl Documentation Protocol::Connection(3pm)
NAME
X11::Protocol::Connection - Perl module abstract base class for X11 client to server connections
SYNOPSIS
# In connection object module
package X11::Protocol::Connection::CarrierPigeon;
use X11::Protocol::Connection;
@ISA = ('X11::Protocol::Connection');
sub open { ... }
sub give { ... }
sub get { ... }
sub fh { ... }
...
# In program
$connection = X11::Protocol::Connection::CarrierPigeon
->open($host, $display_number);
$x = X11::Protocol->new($connection);
$connection->give($data);
$reply = unpack("I", $connection->get(4));
use IO::Select;
$sel = IO::select->new($connection->fh);
if ($sel->can_read == $connection->fh) ...
DESCRIPTION
This module is an abstract base class for the various X11::Protocol::Connection::* modules that provide connections to X servers for the
X11::Protocol module. It provides stubs for the following methods:
open
$conn = X11::Protocol::Connection::Foo->open($host, $display_num)
Open a connection to the specified display (numbered from 0) on the specified $host.
give
$conn->give($data)
Send the given data to the server. Normally, this method is used only by the protocol module itself.
get
$data = $conn->get($n)
Read $n bytes of data from the server. Normally, this method is used only by the protocol module itself.
fh
$filehandle = $conn->fh
Return an object suitable for use as a filehandle. This is mainly useful for doing select() and other such system calls.
AUTHOR
Stephen McCamant <SMCCAM@cpan.org>.
SEE ALSO
perl(1), X11::Protocol, X11::Protocol::Connection::Socket, X11::Protocol::Connection::FileHandle, X11::Protocol::Connection::INETSocket,
X11::Protocol::Connection::UNIXSocket, X11::Protocol::Connection::INETFH, X11::Protocol::Connection::UNIXFH.
perl v5.14.2 2003-01-27 Protocol::Connection(3pm)