DBUS_COOKIE_SHA1 - X11 variant

[Thomas Sondergaard]

Wouldn't it make sense for a session-bus to support a variant of 
DBUS_COOKIE_SHA1 authentication that establish that the client has 
access to read a property on a window on the associated X11 display, 
rather than access to read a file in the users file system? The 
session-bus is, after all, associated with the X11 session, not the 
users file system.

This would be useful for me, because I work for a company that runs 
applications on display clusters, where an application may occasionally 
run on another machine than its X11 display (if resources on that 
machine are running low). I've found old posts on the mailing list that 
have considered discussing session-bus forwarding over ssh, and an 
X11-based version of DBUS_COOKIE_SHA1 would also be useful for that.

Has anyone considered doing this? Would it be difficult to do? What 
would be the best way to do it?

Regards,

Thomas