[RFE] Support signaling only connections owned by specific uid

[Bogdan Lotko]

Hello Pavel,

I don't know the details, but is it not much more simple to make a 
broadcast and process the message only in applications that belong to 
specified user?

regards,

Bogdan


On 2021-04-08 11:05, Pavel Březina wrote:
> Hi dbus,
>
> I would like to be able to connect to system bus and emit a signal. 
> But I want the signal to be delivered to only processes of specific 
> user. That is limit the broadcast to only names owned by the user.
>
> So instead of sending a signal with empty destination, or unicasting 
> it by providing target name, I want to be able to set the destination 
> to e.g. "uid:$uid". The message bus would broadcast it only to names 
> owned by $uid.
>
> I am able to implement this change if this is something that would be 
> accepted.
>
> Rationale:
> We have a daemon (sssd-kcm, Kerberos ccache manager) that runs as root 
> and we would like to implement a notification mechanism (ccache 
> changed, e.g. user kinited), preferably using dbus signals. However, 
> we can not broadcast this information to anyone, we want to limit the 
> signal to target only specific uid (the user who owns the ccache).
>
> I understand there are different ways how to achieve this. For 
> example, get the list of active names, resolve their owner and then 
> send multiple unicast signals. But we would like to pursue this RFE 
> first, if possible.
>
> Thanks,
> Pavel.
>
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