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 OSF1
xkbdfltmap
xkbdfltmap(1X) xkbdfltmap(1X)
NAME
xkbdfltmap - Determine default X keymap for locale and keyboard
SYNOPSIS
xkbdfltmap [options]
OPTIONS
lang specifies a string to be used instead of the console language. This option is useful for locales that cannot be specified in the con-
sole. This option is only used if XKB is active in the server. kbd specifies a string to be used instead of the console keyboard. This
option is useful for keyboard types that cannot be uniquely identified by the kernel. For example, the kernal identifies the Microsoft
Natural Keyboard as a PCXAL. If XKB is not active in the server, file specifies the xmodmap command. The default is /usr/bin/X11/xmodmap.
If XKB is not active in the server, file specifies the file containing the information necessary to determine what xmodmap keymap to use
based upon the console language and keyboard type. The default is /usr/lib/X11/xdm/Xkeymaps. If XKB is active in the server, file speci-
fies the XKB keyboard compiler. The default is /usr/bin/X11/xkbcomp. If XKB is active in the server, path specifies the top-level direc-
tory that contains the XKB keymaps. The default is /usr/lib/X11/xkb. If XKB is active in the server, file specifies the file containing
the information necessary to determine what XKB keymap to use based upon the console language and keyboard type. The default is
/usr/lib/X11/keymaps.dir. Specifies whether execute the necessary command to download the keymap to the server after determining the
default, or whether to just print out the necessary command. Specify -exec to download the keymap. Specify -noexec to just print out the
necessary command. The default is -noexec. If the -noexec command is specified, and XKB is active in the server, the -file option
instructs xkbdfltmap to print out just the XKB keymap file that contains the keymap. A keymap will not be downloaded to the server if
-file is used. If the -noexec command is specified, and XKB is active in the server, the -map option instructs xkbdfltmap to print out
just the XKB keymap name. A keymap will not be downloaded to the server if -map is used.
DESCRIPTION
The xkbdfltmap command queries the system console for the language and keyboard settings. Then, based upon whether the XKB server exten-
sion is active in the server, it will optionally download an xmodmap file from /usr/lib/X11/keymaps or an XKB keymap file from
/usr/lib/X11/xkb to the server.
FILES
/usr/lib/X11/xdm/Xkeymaps
/usr/lib/X11/xkb/keymaps.dir
SEE ALSO
X(1X)
xkbdfltmap(1X)