Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 488 insertions, 0 deletions

diff --git a/source4/ntvfs/posix/pvfs_xattr.c b/source4/ntvfs/posix/pvfs_xattr.c
new file mode 100644
index 0000000..ab88d89
--- /dev/null
+++ b/source4/ntvfs/posix/pvfs_xattr.c
@@ -0,0 +1,488 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   POSIX NTVFS backend - xattr support
+
+   Copyright (C) Andrew Tridgell 2004
+
+   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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "vfs_posix.h"
+#include "../lib/util/unix_privs.h"
+#include "librpc/gen_ndr/ndr_xattr.h"
+#include "param/param.h"
+#include "ntvfs/posix/posix_eadb_proto.h"
+
+/*
+  pull a xattr as a blob
+*/
+static NTSTATUS pull_xattr_blob(struct pvfs_state *pvfs,
+				TALLOC_CTX *mem_ctx,
+				const char *attr_name, 
+				const char *fname, 
+				int fd, 
+				size_t estimated_size,
+				DATA_BLOB *blob)
+{
+	NTSTATUS status;
+
+	if (pvfs->ea_db) {
+		return pull_xattr_blob_tdb(pvfs, mem_ctx, attr_name, fname, 
+					   fd, estimated_size, blob);
+	}
+
+	status = pull_xattr_blob_system(pvfs, mem_ctx, attr_name, fname, 
+					fd, estimated_size, blob);
+
+	/* if the filesystem doesn't support them, then tell pvfs not to try again */
+	if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)||
+	    NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)||
+	    NT_STATUS_EQUAL(status, NT_STATUS_INVALID_SYSTEM_SERVICE)) {
+		DEBUG(2,("pvfs_xattr: xattr not supported in filesystem: %s\n", nt_errstr(status)));
+		pvfs->flags &= ~PVFS_FLAG_XATTR_ENABLE;
+		status = NT_STATUS_NOT_FOUND;
+	}
+
+	return status;
+}
+
+/*
+  push a xattr as a blob
+*/
+static NTSTATUS push_xattr_blob(struct pvfs_state *pvfs,
+				const char *attr_name, 
+				const char *fname, 
+				int fd, 
+				const DATA_BLOB *blob)
+{
+	if (pvfs->ea_db) {
+		return push_xattr_blob_tdb(pvfs, attr_name, fname, fd, blob);
+	}
+	return push_xattr_blob_system(pvfs, attr_name, fname, fd, blob);
+}
+
+
+/*
+  delete a xattr
+*/
+static NTSTATUS delete_xattr(struct pvfs_state *pvfs, const char *attr_name, 
+			     const char *fname, int fd)
+{
+	if (pvfs->ea_db) {
+		return delete_posix_eadb(pvfs, attr_name, fname, fd);
+	}
+	return delete_xattr_system(pvfs, attr_name, fname, fd);
+}
+
+/*
+  a hook called on unlink - allows the tdb xattr backend to cleanup
+*/
+NTSTATUS pvfs_xattr_unlink_hook(struct pvfs_state *pvfs, const char *fname)
+{
+	if (pvfs->ea_db) {
+		return unlink_posix_eadb(pvfs, fname);
+	}
+	return unlink_xattr_system(pvfs, fname);
+}
+
+
+/*
+  load a NDR structure from a xattr
+*/
+NTSTATUS pvfs_xattr_ndr_load(struct pvfs_state *pvfs,
+			     TALLOC_CTX *mem_ctx,
+			     const char *fname, int fd, const char *attr_name,
+			     void *p, void *pull_fn)
+{
+	NTSTATUS status;
+	DATA_BLOB blob;
+	enum ndr_err_code ndr_err;
+
+	status = pull_xattr_blob(pvfs, mem_ctx, attr_name, fname, 
+				 fd, XATTR_DOSATTRIB_ESTIMATED_SIZE, &blob);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	/* pull the blob */
+	ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, p,
+								   (ndr_pull_flags_fn_t)pull_fn);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		return ndr_map_error2ntstatus(ndr_err);
+	}
+
+	data_blob_free(&blob);
+
+	return NT_STATUS_OK;
+}
+
+/*
+  save a NDR structure into a xattr
+*/
+NTSTATUS pvfs_xattr_ndr_save(struct pvfs_state *pvfs,
+			     const char *fname, int fd, const char *attr_name, 
+			     void *p, void *push_fn)
+{
+	TALLOC_CTX *mem_ctx = talloc_new(NULL);
+	DATA_BLOB blob;
+	NTSTATUS status;
+	enum ndr_err_code ndr_err;
+
+	ndr_err = ndr_push_struct_blob(&blob, mem_ctx, p, (ndr_push_flags_fn_t)push_fn);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		talloc_free(mem_ctx);
+		return ndr_map_error2ntstatus(ndr_err);
+	}
+
+	status = push_xattr_blob(pvfs, attr_name, fname, fd, &blob);
+	talloc_free(mem_ctx);
+
+	return status;
+}
+
+
+/*
+  fill in file attributes from extended attributes
+*/
+NTSTATUS pvfs_dosattrib_load(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd)
+{
+	NTSTATUS status;
+	struct xattr_DosAttrib attrib;
+	TALLOC_CTX *mem_ctx = talloc_new(name);
+	struct xattr_DosInfo1 *info1;
+	struct xattr_DosInfo2Old *info2;
+
+	if (name->stream_name != NULL) {
+		name->stream_exists = false;
+	} else {
+		name->stream_exists = true;
+	}
+
+	if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
+		return NT_STATUS_OK;
+	}
+
+	status = pvfs_xattr_ndr_load(pvfs, mem_ctx, name->full_name, 
+				     fd, XATTR_DOSATTRIB_NAME,
+				     &attrib,
+				     (void *) ndr_pull_xattr_DosAttrib);
+
+	/* not having a DosAttrib is not an error */
+	if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
+		talloc_free(mem_ctx);
+		return pvfs_stream_info(pvfs, name, fd);
+	}
+
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(mem_ctx);
+		return status;
+	}
+
+	switch (attrib.version) {
+	case 1:
+		info1 = &attrib.info.info1;
+		name->dos.attrib = pvfs_attrib_normalise(info1->attrib, 
+							 name->st.st_mode);
+		name->dos.ea_size = info1->ea_size;
+		if (name->st.st_size == info1->size) {
+			name->dos.alloc_size = 
+				pvfs_round_alloc_size(pvfs, info1->alloc_size);
+		}
+		if (!null_nttime(info1->create_time)) {
+			name->dos.create_time = info1->create_time;
+		}
+		if (!null_nttime(info1->change_time)) {
+			name->dos.change_time = info1->change_time;
+		}
+		name->dos.flags = 0;
+		break;
+
+	case 2:
+		/*
+		 * Note: This is only used to parse existing values from disk
+		 *       We use xattr_DosInfo1 again for storing new values
+		 */
+		info2 = &attrib.info.oldinfo2;
+		name->dos.attrib = pvfs_attrib_normalise(info2->attrib, 
+							 name->st.st_mode);
+		name->dos.ea_size = info2->ea_size;
+		if (name->st.st_size == info2->size) {
+			name->dos.alloc_size = 
+				pvfs_round_alloc_size(pvfs, info2->alloc_size);
+		}
+		if (!null_nttime(info2->create_time)) {
+			name->dos.create_time = info2->create_time;
+		}
+		if (!null_nttime(info2->change_time)) {
+			name->dos.change_time = info2->change_time;
+		}
+		name->dos.flags = info2->flags;
+		break;
+
+	default:
+		DEBUG(0,("ERROR: Unsupported xattr DosAttrib version %d on '%s'\n",
+			 attrib.version, name->full_name));
+		talloc_free(mem_ctx);
+		return NT_STATUS_INVALID_LEVEL;
+	}
+	talloc_free(mem_ctx);
+	
+	status = pvfs_stream_info(pvfs, name, fd);
+
+	return status;
+}
+
+
+/*
+  save the file attribute into the xattr
+*/
+NTSTATUS pvfs_dosattrib_save(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd)
+{
+	struct xattr_DosAttrib attrib;
+	struct xattr_DosInfo1 *info1;
+
+	if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
+		return NT_STATUS_OK;
+	}
+
+	attrib.version = 1;
+	info1 = &attrib.info.info1;
+
+	name->dos.attrib = pvfs_attrib_normalise(name->dos.attrib, name->st.st_mode);
+
+	info1->attrib      = name->dos.attrib;
+	info1->ea_size     = name->dos.ea_size;
+	info1->size        = name->st.st_size;
+	info1->alloc_size  = name->dos.alloc_size;
+	info1->create_time = name->dos.create_time;
+	info1->change_time = name->dos.change_time;
+
+	return pvfs_xattr_ndr_save(pvfs, name->full_name, fd, 
+				   XATTR_DOSATTRIB_NAME, &attrib, 
+				   (void *) ndr_push_xattr_DosAttrib);
+}
+
+
+/*
+  load the set of DOS EAs
+*/
+NTSTATUS pvfs_doseas_load(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
+			  struct xattr_DosEAs *eas)
+{
+	NTSTATUS status;
+	ZERO_STRUCTP(eas);
+
+	if (name->stream_name) {
+		/* We don't support EAs on streams */
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
+		return NT_STATUS_OK;
+	}
+	status = pvfs_xattr_ndr_load(pvfs, eas, name->full_name, fd, XATTR_DOSEAS_NAME,
+				     eas, (void *) ndr_pull_xattr_DosEAs);
+	if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
+		return NT_STATUS_OK;
+	}
+	return status;
+}
+
+/*
+  save the set of DOS EAs
+*/
+NTSTATUS pvfs_doseas_save(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
+			  struct xattr_DosEAs *eas)
+{
+	if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
+		return NT_STATUS_OK;
+	}
+	return pvfs_xattr_ndr_save(pvfs, name->full_name, fd, XATTR_DOSEAS_NAME, eas, 
+				   (void *) ndr_push_xattr_DosEAs);
+}
+
+
+/*
+  load the set of streams from extended attributes
+*/
+NTSTATUS pvfs_streams_load(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
+			   struct xattr_DosStreams *streams)
+{
+	NTSTATUS status;
+	ZERO_STRUCTP(streams);
+	if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
+		return NT_STATUS_OK;
+	}
+	status = pvfs_xattr_ndr_load(pvfs, streams, name->full_name, fd, 
+				     XATTR_DOSSTREAMS_NAME,
+				     streams, 
+				     (void *) ndr_pull_xattr_DosStreams);
+	if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
+		return NT_STATUS_OK;
+	}
+	return status;
+}
+
+/*
+  save the set of streams into filesystem xattr
+*/
+NTSTATUS pvfs_streams_save(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
+			   struct xattr_DosStreams *streams)
+{
+	if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
+		return NT_STATUS_OK;
+	}
+	return pvfs_xattr_ndr_save(pvfs, name->full_name, fd, 
+				   XATTR_DOSSTREAMS_NAME, 
+				   streams, 
+				   (void *) ndr_push_xattr_DosStreams);
+}
+
+
+/*
+  load the current ACL from extended attributes
+*/
+NTSTATUS pvfs_acl_load(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
+		       struct xattr_NTACL *acl)
+{
+	NTSTATUS status;
+	ZERO_STRUCTP(acl);
+	if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
+		return NT_STATUS_NOT_FOUND;
+	}
+	status = pvfs_xattr_ndr_load(pvfs, acl, name->full_name, fd, 
+				     XATTR_NTACL_NAME,
+				     acl, 
+				     (void *) ndr_pull_xattr_NTACL);
+	return status;
+}
+
+/*
+  save the acl for a file into filesystem xattr
+*/
+NTSTATUS pvfs_acl_save(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
+		       struct xattr_NTACL *acl)
+{
+	NTSTATUS status;
+	void *privs;
+
+	if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
+		return NT_STATUS_OK;
+	}
+
+	/* this xattr is in the "system" namespace, so we need
+	   admin privileges to set it */
+	privs = root_privileges();
+	status = pvfs_xattr_ndr_save(pvfs, name->full_name, fd, 
+				     XATTR_NTACL_NAME, 
+				     acl, 
+				     (void *) ndr_push_xattr_NTACL);
+	talloc_free(privs);
+	return status;
+}
+
+/*
+  create a zero length xattr with the given name
+*/
+NTSTATUS pvfs_xattr_create(struct pvfs_state *pvfs, 
+			   const char *fname, int fd,
+			   const char *attr_prefix,
+			   const char *attr_name)
+{
+	NTSTATUS status;
+	DATA_BLOB blob = data_blob(NULL, 0);
+	char *aname = talloc_asprintf(NULL, "%s%s", attr_prefix, attr_name);
+	if (aname == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	status = push_xattr_blob(pvfs, aname, fname, fd, &blob);
+	talloc_free(aname);
+	return status;
+}
+
+
+/*
+  delete a xattr with the given name
+*/
+NTSTATUS pvfs_xattr_delete(struct pvfs_state *pvfs, 
+			   const char *fname, int fd,
+			   const char *attr_prefix,
+			   const char *attr_name)
+{
+	NTSTATUS status;
+	char *aname = talloc_asprintf(NULL, "%s%s", attr_prefix, attr_name);
+	if (aname == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	status = delete_xattr(pvfs, aname, fname, fd);
+	talloc_free(aname);
+	return status;
+}
+
+/*
+  load a xattr with the given name
+*/
+NTSTATUS pvfs_xattr_load(struct pvfs_state *pvfs, 
+			 TALLOC_CTX *mem_ctx,
+			 const char *fname, int fd,
+			 const char *attr_prefix,
+			 const char *attr_name,
+			 size_t estimated_size,
+			 DATA_BLOB *blob)
+{
+	NTSTATUS status;
+	char *aname = talloc_asprintf(mem_ctx, "%s%s", attr_prefix, attr_name);
+	if (aname == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	status = pull_xattr_blob(pvfs, mem_ctx, aname, fname, fd, estimated_size, blob);
+	talloc_free(aname);
+	return status;
+}
+
+/*
+  save a xattr with the given name
+*/
+NTSTATUS pvfs_xattr_save(struct pvfs_state *pvfs, 
+			 const char *fname, int fd,
+			 const char *attr_prefix,
+			 const char *attr_name,
+			 const DATA_BLOB *blob)
+{
+	NTSTATUS status;
+	char *aname = talloc_asprintf(NULL, "%s%s", attr_prefix, attr_name);
+	if (aname == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	status = push_xattr_blob(pvfs, aname, fname, fd, blob);
+	talloc_free(aname);
+	return status;
+}
+
+
+/*
+  probe for system support for xattrs
+*/
+void pvfs_xattr_probe(struct pvfs_state *pvfs)
+{
+	TALLOC_CTX *tmp_ctx = talloc_new(pvfs);
+	DATA_BLOB blob;
+	pull_xattr_blob(pvfs, tmp_ctx, "user.XattrProbe", pvfs->base_directory, 
+			-1, 1, &blob);
+	pull_xattr_blob(pvfs, tmp_ctx, "security.XattrProbe", pvfs->base_directory, 
+			-1, 1, &blob);
+	talloc_free(tmp_ctx);
+}