From: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Date: Sat, 25 May 2013 13:24:15 +0000 (-0700)
Subject: On unix systems, when creating the default authentication token
X-Git-Tag: upstream/1.9.6^2~207
X-Git-Url: https://git.piment-noir.org/?p=deb_libnfs.git;a=commitdiff_plain;h=43e0e7a7e6cbec9ba55db89eac368d42e969ad55

On unix systems, when creating the default authentication token
use getgid() as the group instead of -1.
Recent linux knfsd do not allow grp==-1

On windows there are no uid/gids in the traditional sense so there I still specify a default credential of uid==gid==-1 :
	rpc->auth = authunix_create("LibNFS", 65535, 65535, 0, NULL);

This is I think the sanest/safest thing to do since most servers will have
special handing of -1 meaning 'nobody' or similar.
This should work on many/most servers and give the user the minimum available
access allowed for 'nobody'.

I think on windows (or AROS for that matter) applications will probably have
to invoke and set the credentials themself explicitely.
Those apps probably, unfortunately, also need to have a configuration
setting to select which uid/gid to use when talking to the server.
(or they could hardcode it)

rpc_set_auth(rpc, libnfs_authunix_create("hostname", uid, gid, 0, NULL))
should do the trick if they call immediately after creating the rpc/nfs context.

But dont set it to 0,0 root/root for uid/gid.
First of all, most servers have root-squash so they will re-map this uid/gid
to 'nobody' internally.
But, if the user uses a server that does not do root-squash, then setting this to 0,0 would mean that your app now access the nfs share as root   which is probably not what you want.
---

diff --git a/lib/libnfs-zdr.c b/lib/libnfs-zdr.c
index 24bf6c2..29bb18d 100644
--- a/lib/libnfs-zdr.c
+++ b/lib/libnfs-zdr.c
@@ -504,7 +504,7 @@ struct AUTH *libnfs_authunix_create(char *host, uint32_t uid, uint32_t gid, uint
 
 struct AUTH *libnfs_authunix_create_default(void)
 {
-	return libnfs_authunix_create("libnfs", getuid(), -1, 0, NULL);
+	return libnfs_authunix_create("libnfs", getuid(), getgid(), 0, NULL);
 }
 
 void libnfs_auth_destroy(struct AUTH *auth)