From: Chip Salzenberg <chip@pobox.com>
Subject: ACL patch - is this bad or good?
Date: Sat, 4 Dec 2004 17:26:59 -0500
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Hi there.  A Debian user contributed a copy of what he says is a Red
Hat patch to support "acl" and "no_acl" options for NFS exports.

Is this patch OK?
-- 
Chip Salzenberg              - a.k.a. -           <chip@pobox.com>
People are supposed to die for freedom.  Not the other way around.

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Add `no_acl' nfs export option

This patch adds the `acl' and `no_acl' nfs export options, which replace
the nfs_permission_mode module parameter of nfsd.o. The `no_acl' option
tells nfsd to mask off acl permissions so that clients will see a subset
of permissions that is safe even with old clients. Current clients
implement the NFSv3 ACCESS RPC, and therefore do not require the
`no_acl' export option. If no acls are supported in the nfs server, the
`no_acl' export option is not needed, either.

Thanks to Steve Dickson <SteveD@redhat.com> for proposing this.


Andreas Gruenbacher <agruen@suse.de>, SuSE Labs


Index: nfs-utils-1.0.4/utils/exportfs/exportfs.c
===================================================================
--- nfs-utils-1.0.4.orig/utils/exportfs/exportfs.c	2003-07-03 03:28:53.000000000 +0200
+++ nfs-utils-1.0.4/utils/exportfs/exportfs.c	2003-07-14 12:56:26.000000000 +0200
@@ -378,6 +378,8 @@ dump(int verbose)
 				c = dumpopt(c, "no_subtree_check");
 			if (ep->e_flags & NFSEXP_NOAUTHNLM)
 				c = dumpopt(c, "insecure_locks");
+			if (ep->e_flags & NFSEXP_NOACL)
+				c = dumpopt(c, "no_acl");
 			if (ep->e_flags & NFSEXP_FSID)
 				c = dumpopt(c, "fsid=%d", ep->e_fsid);
 			if (ep->e_mountpoint)
Index: nfs-utils-1.0.4/support/nfs/exports.c
===================================================================
--- nfs-utils-1.0.4.orig/support/nfs/exports.c	2003-05-30 07:17:56.000000000 +0200
+++ nfs-utils-1.0.4/support/nfs/exports.c	2003-07-14 12:56:26.000000000 +0200
@@ -185,6 +185,8 @@ putexportent(struct exportent *ep)
 		"no_" : "");
 	fprintf(fp, "%ssecure_locks,", (ep->e_flags & NFSEXP_NOAUTHNLM)?
 		"in" : "");
+	fprintf(fp, "%sacl,", (ep->e_flags & NFSEXP_NOACL)?
+		"no_" : "");
 	if (ep->e_flags & NFSEXP_FSID) {
 		fprintf(fp, "fsid=%d,", ep->e_fsid);
 	}
@@ -374,6 +376,10 @@ parseopts(char *cp, struct exportent *ep
 			ep->e_flags &= ~NFSEXP_NOAUTHNLM;
 		else if (strcmp(opt, "insecure_locks") == 0)
 			ep->e_flags |= NFSEXP_NOAUTHNLM;
+		else if (strcmp(opt, "acl") == 0)
+			ep->e_flags &= ~NFSEXP_NOACL;
+		else if (strcmp(opt, "no_acl") == 0)
+			ep->e_flags |= NFSEXP_NOACL;
 		else if (strncmp(opt, "mapping=", 8) == 0)
 			ep->e_maptype = parsemaptype(opt+8);
 		else if (strcmp(opt, "map_identity") == 0)	/* old style */
Index: nfs-utils-1.0.4/utils/exportfs/exports.man
===================================================================
--- nfs-utils-1.0.4.orig/utils/exportfs/exports.man	2003-05-30 07:17:56.000000000 +0200
+++ nfs-utils-1.0.4/utils/exportfs/exports.man	2003-07-14 12:56:26.000000000 +0200
@@ -218,6 +218,21 @@ be explicitly requested with either of t
 .IR auth_nlm ,
 or
 .IR secure_locks .
+.TP
+.IR no_acl
+This option tells nfsd to mask off acl permissions so that clients will
+only see a subset of the permissions on the exported file system. This
+subset is safe for NFSv2 clients, and for NFSv3 clients that perform
+access decisions locally. Current NFSv3 clients use the ACCESS RPC
+to perform all access decisions on the server. The
+.I no_acl
+option should be used for nfs exports with acl support that are exported
+to NFSv2 clients, or to NFSv3 clients that don't use the ACCESS RPC.
+This option is not needed for recent NFSv3 clients or if the exported
+file system has no acl support. The default is to export with acl
+support enabled (i.e.,
+.I no_acl
+is off.)
 
 '''.TP
 '''.I noaccess

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