[Bug 2813] sshd fails to start in user namespaces when the gid for tty is not mapped

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2813

--- Comment #2 from Oliver Freyermuth <o.freyermuth at googlemail.com> ---
That's not possible. 
See:
http://man7.org/linux/man-pages/man7/user_namespaces.7.html

In short, as already mentioned, in a user-namespace, one can only map
his / her own effective uid / gid from outside the namespace to a
single uid / gid paid inside the namespace. 
Mapping of other uids / gids required privileges (CAP_SETUID /
CAP_SETGID) in the parent namespace, which users do not have. 

So there is nothing to configure, sadly.

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