This is a proposal to improve libnfsidmap to support kerberized NFS4
server and client environments with a mixed setup using short and fully
qualified names.
My situation is the following: I want to use a file server that is set
up to use fully qualified names (sssd.conf: use_fully_qualified_names =
true). I have no say in the configuration of said server. On the clients
I want to use short names since there is only one realm anyway and the
lengthy johndoe@xxxxxxxxxxx user and group names are too cumbersome.
On all Linux distros I have tried this works with the exception of the
chgrp (and chown) command. Changing the group always results in an
'Operation not permitted' error.
I have tracked down the source of the problem to nsswitch.so in
libnfsidmap. In nss.c the write_name() function creates the user@domain
string that is sent over the wire. For short names it should actually
send user@realm@domain, at least if the server is configured to use
fully qualified names. I have patched the function to do this and
verified that this actually fixes my problem with chgrp.
Has this been noticed or discussed before? Would a patch be welcome and
have a chance to be integrated in the upstream libnfsidmap that would
then trickle down to the various distros?
Stefan
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