r19441: work in progress support for NFS4 ACLs in Samba4 on Linux. Still work

to do, particularly with getting the detailed bit mappings right, and
on sid mapping. Does not pass RAW-ACLS yet
(This used to be commit b92553481b534d0ef5277dbfe8c0d64a03f819eb)

1 files changed, 163 insertions, 0 deletions

diff --git a/source4/ntvfs/posix/pvfs_acl_nfs4.c b/source4/ntvfs/posix/pvfs_acl_nfs4.c
new file mode 100644
index 0000000000..b0a329c639
--- /dev/null
+++ b/source4/ntvfs/posix/pvfs_acl_nfs4.c
@@ -0,0 +1,163 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   POSIX NTVFS backend - NT ACLs mapped to NFS4 ACLs, as per
+   http://www.suse.de/~agruen/nfs4acl/
+
+   Copyright (C) Andrew Tridgell 2006
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "vfs_posix.h"
+#include "lib/util/unix_privs.h"
+#include "librpc/gen_ndr/ndr_nfs4acl.h"
+#include "libcli/security/security.h"
+
+#define ACE4_IDENTIFIER_GROUP 0x40
+
+/*
+  load the current ACL from system.nfs4acl
+*/
+static NTSTATUS pvfs_acl_load_nfs4(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
+				   TALLOC_CTX *mem_ctx,
+				   struct security_descriptor **psd)
+{
+	NTSTATUS status;
+	struct nfs4acl *acl;
+	struct security_descriptor *sd;
+	int i;
+
+	acl = talloc_zero(mem_ctx, struct nfs4acl);
+	NT_STATUS_HAVE_NO_MEMORY(acl);
+
+	status = pvfs_xattr_ndr_load(pvfs, mem_ctx, name->full_name, fd, 
+				     NFS4ACL_XATTR_NAME,
+				     acl, ndr_pull_nfs4acl);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(acl);
+		return status;
+	}
+
+	*psd = security_descriptor_initialise(mem_ctx);
+	NT_STATUS_HAVE_NO_MEMORY(*psd);
+
+	sd = *psd;
+
+	sd->type |= acl->a_flags;
+	status = sidmap_uid_to_sid(pvfs->sidmap, sd, name->st.st_uid, &sd->owner_sid);
+	NT_STATUS_NOT_OK_RETURN(status);
+	status = sidmap_gid_to_sid(pvfs->sidmap, sd, name->st.st_gid, &sd->group_sid);
+	NT_STATUS_NOT_OK_RETURN(status);
+
+	for (i=0;i<acl->a_count;i++) {
+		struct nfs4ace *a = &acl->ace[i];
+		struct security_ace ace;
+		struct dom_sid *sid;
+		ace.type = a->e_type;
+		ace.flags = a->e_flags;
+		ace.access_mask = a->e_mask;
+		if (a->e_flags & ACE4_IDENTIFIER_GROUP) {
+			status = sidmap_gid_to_sid(pvfs->sidmap, sd, a->e_id, &sid);
+		} else {
+			status = sidmap_uid_to_sid(pvfs->sidmap, sd, a->e_id, &sid);
+		}
+		NT_STATUS_NOT_OK_RETURN(status);
+		ace.trustee = *sid;
+		security_descriptor_dacl_add(sd, &ace);
+	}
+
+	return NT_STATUS_OK;
+}
+
+/*
+  save the acl for a file into system.nfs4acl
+*/
+static NTSTATUS pvfs_acl_save_nfs4(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
+				   struct security_descriptor *sd)
+{
+	NTSTATUS status;
+	void *privs;
+	struct nfs4acl acl;
+	int i;
+	TALLOC_CTX *tmp_ctx;
+
+	tmp_ctx = talloc_new(pvfs);
+	NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
+
+	acl.a_version = 0;
+	acl.a_flags   = sd->type;
+	acl.a_count   = sd->dacl?sd->dacl->num_aces:0;
+	acl.a_owner_mask = 0;
+	acl.a_group_mask = 0;
+	acl.a_other_mask = 0;
+
+	acl.ace = talloc_array(tmp_ctx, struct nfs4ace, acl.a_count);
+	if (!acl.ace) {
+		talloc_free(tmp_ctx);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	for (i=0;i<acl.a_count;i++) {
+		struct nfs4ace *a = &acl.ace[i];
+		struct security_ace *ace = &sd->dacl->aces[i];
+		a->e_type  = ace->type;
+		a->e_flags = ace->flags;
+		a->e_mask  = ace->access_mask;
+		if (sidmap_sid_is_group(pvfs->sidmap, &ace->trustee)) {
+			gid_t gid;
+			a->e_flags |= ACE4_IDENTIFIER_GROUP;
+			status = sidmap_sid_to_unixgid(pvfs->sidmap, &ace->trustee, &gid);
+			if (!NT_STATUS_IS_OK(status)) {
+				talloc_free(tmp_ctx);
+				return status;
+			}
+			a->e_id = gid;
+		} else {
+			uid_t uid;
+			status = sidmap_sid_to_unixuid(pvfs->sidmap, &ace->trustee, &uid);
+			if (!NT_STATUS_IS_OK(status)) {
+				talloc_free(tmp_ctx);
+				return status;
+			}
+			a->e_id = uid;
+		}
+		a->e_who   = "";
+	}
+
+	privs = root_privileges();
+	status = pvfs_xattr_ndr_save(pvfs, name->full_name, fd, 
+				     NFS4ACL_XATTR_NAME, 
+				     &acl, ndr_push_nfs4acl);
+	talloc_free(privs);
+
+	talloc_free(tmp_ctx);
+	return status;
+}
+
+
+/*
+  initialise pvfs acl NFS4 backend
+*/
+NTSTATUS pvfs_acl_nfs4_init(void)
+{
+	struct pvfs_acl_ops ops = {
+		.name = "nfs4acl",
+		.acl_load = pvfs_acl_load_nfs4,
+		.acl_save = pvfs_acl_save_nfs4
+	};
+	return pvfs_acl_register(&ops);
+}