[arch-general] Which security setting in Arch prevents forwarding X apps when su root?

[Tim Gelter]

Damjan Georgievski wrote:
>> Which setting in Arch prevents forwarding apps when you ssh -X in an Arch box,
>> su and then try to start a kde app, etc.? X forwarding works just fine as a
>> user, but when trying it su'ed to root, I get the following error:
>>
>> [23:29 archangel:/etc] # kwrite
>> X11 connection rejected because of wrong authentication.
>> kwrite: cannot connect to X server localhost:10.0
> 
> In order for X apps to connect to the X server they need to provide a
> security cookie. The standard path for the cookie is ~/.Xauthority .
> ssh -X does append the cookie to this file  so that's why you can
> start X apps when logged in as user. But when you "su",  ~/.Xauthority
> is now another file (/root/.Xauthority) and that one doesn't have the
> cookie.
> 
> As Eric said, kdesu or gsu are sollution ... or you could copy the
> Xauthority file
> 
>> kdm config? X config? Any pointers/links would be appreciated.
> 
> none
> 
> 
If I understand correctly, this should happen automatically if you use
the following:
aur/sux 1.0.1_5-1 (38)
    A wrapper around su which will transfer your X credentials
-Tim

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