nsupdate and netlink_socket AVCs

[Daniel J Walsh]

Aleksey Nogin wrote:
Is nsupdate a program to be run by an ordinary user? 
If yes we need to define a security context for nsupdate to allow it to 
access the netlink_sockets.

If we allow users access that any rogue app the user runs could access 
the network devices.

Dan

> If I attempt to use nsupdate from under an ordinary user (which 
> shouldn't be a problem, should it?), then I see
>
> audit(1079022100.499:0): avc:  denied  { bind } for  pid=18759 
> exe=/usr/bin/nsupdate scontext=user_u:user_r:user_t 
> tcontext=user_u:user_r:user_t tclass=netlink_socket
> audit(1079022100.499:0): avc:  denied  { getattr } for  pid=18759 
> exe=/usr/bin/nsupdate scontext=user_u:user_r:user_t 
> tcontext=user_u:user_r:user_t tclass=netlink_socket
> audit(1079022100.499:0): avc:  denied  { write } for  pid=18759 
> exe=/usr/bin/nsupdate scontext=user_u:user_r:user_t 
> tcontext=user_u:user_r:user_t tclass=netlink_socket
> audit(1079022100.500:0): avc:  denied  { read } for  pid=18759 
> exe=/usr/bin/nsupdate scontext=user_u:user_r:user_t 
> tcontext=user_u:user_r:user_t tclass=netlink_socket
>
> Not sure what this is all about.
>