/etc/selinux/mls/contexts/x_contexts is in selinux-policy-mls 2:2.20110726-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Config file for XSELinux extension
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#
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### Rules for X Clients
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#
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# The default client rule defines a context to be used for all clients
# connecting to the server from a remote host.
#
client * system_u:object_r:remote_t:s0
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### Rules for X Properties
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#
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# Property rules map a property name to a context. A default property
# rule indicated by an asterisk should follow all other property rules.
#
# Properties that normal clients may only read
property _SELINUX_* system_u:object_r:seclabel_xproperty_t:s0
# Clipboard and selection properties
property CUT_BUFFER? system_u:object_r:clipboard_xproperty_t:s0
# Default fallback type
property * system_u:object_r:xproperty_t:s0
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### Rules for X Extensions
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#
#
# Extension rules map an extension name to a context. A default extension
# rule indicated by an asterisk should follow all other extension rules.
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# Restricted extensions
extension SELinux system_u:object_r:security_xextension_t:s0
# Standard extensions
extension * system_u:object_r:xextension_t:s0
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### Rules for X Selections
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#
# Selection rules map a selection name to a context. A default selection
# rule indicated by an asterisk should follow all other selection rules.
#
# Standard selections
selection PRIMARY system_u:object_r:clipboard_xselection_t:s0
selection CLIPBOARD system_u:object_r:clipboard_xselection_t:s0
# Default fallback type
selection * system_u:object_r:xselection_t:s0
#
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### Rules for X Events
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#
#
# Event rules map an event protocol name to a context. A default event
# rule indicated by an asterisk should follow all other event rules.
#
# Input events
event X11:KeyPress system_u:object_r:input_xevent_t:s0
event X11:KeyRelease system_u:object_r:input_xevent_t:s0
event X11:ButtonPress system_u:object_r:input_xevent_t:s0
event X11:ButtonRelease system_u:object_r:input_xevent_t:s0
event X11:MotionNotify system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceKeyPress system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceKeyRelease system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceButtonPress system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceButtonRelease system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceMotionNotify system_u:object_r:input_xevent_t:s0
event XInputExtension:DeviceValuator system_u:object_r:input_xevent_t:s0
event XInputExtension:ProximityIn system_u:object_r:input_xevent_t:s0
event XInputExtension:ProximityOut system_u:object_r:input_xevent_t:s0
# Client message events
event X11:ClientMessage system_u:object_r:client_xevent_t:s0
event X11:SelectionNotify system_u:object_r:client_xevent_t:s0
event X11:UnmapNotify system_u:object_r:client_xevent_t:s0
event X11:ConfigureNotify system_u:object_r:client_xevent_t:s0
# Default fallback type
event * system_u:object_r:xevent_t:s0
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