s3: smbd: Add two new functions in a new file, smb2_posix.c: smb2_posix_cc_info(), store_smb2_posix_info()

Not yet used.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>

Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Tue Feb  1 17:25:45 UTC 2022 on sn-devel-184

source3/smbd/proto.h

@@ -1331,4 +1331,15 @@ NTSTATUS vfs_default_durable_reconnect(struct connection_struct *conn,
 				       files_struct **result,
 				       DATA_BLOB *new_cookie);
 
+/* The following definitions come from smbd/smb2_posix.c */
+DATA_BLOB smb2_posix_cc_info(TALLOC_CTX *mem_ctx,
+				connection_struct *conn,
+				uint32_t reparse_tag,
+				const SMB_STRUCT_STAT *psbuf);
+DATA_BLOB store_smb2_posix_info(TALLOC_CTX *mem_ctx,
+				connection_struct *conn,
+				const SMB_STRUCT_STAT *psbuf,
+				uint32_t reparse_tag,
+				uint32_t dos_attributes);
+
 #endif /* _SMBD_PROTO_H_ */

source3/smbd/smb2_posix.c

@@ -0,0 +1,170 @@
+/*
+   Unix SMB/CIFS implementation.
+   SMB2 POSIX code.
+   Copyright (C) Jeremy Allison                 2022
+
+   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 "smbd/smbd.h"
+#include "passdb/lookup_sid.h"
+#include "librpc/gen_ndr/ndr_security.h"
+
+/*
+ * SMB2 POSIX create context return details.
+ */
+DATA_BLOB smb2_posix_cc_info(TALLOC_CTX *mem_ctx,
+				connection_struct *conn,
+				uint32_t reparse_tag,
+				const SMB_STRUCT_STAT *psbuf)
+{
+	DATA_BLOB ret_blob = data_blob_null;
+	struct dom_sid sid_owner;
+	struct dom_sid sid_group;
+	size_t owner_sid_size = 0;
+	size_t group_sid_size = 0;
+	size_t b_size = 12;
+
+	uid_to_sid(&sid_owner, psbuf->st_ex_uid);
+	owner_sid_size = ndr_size_dom_sid(&sid_owner, 0);
+	if (b_size + owner_sid_size < b_size) {
+		return data_blob_null;
+	}
+	b_size += owner_sid_size;
+
+	gid_to_sid(&sid_group, psbuf->st_ex_gid);
+	group_sid_size = ndr_size_dom_sid(&sid_group, 0);
+	if (b_size + group_sid_size < b_size) {
+		return data_blob_null;
+	}
+	b_size += group_sid_size;
+
+	ret_blob = data_blob_talloc(mem_ctx,
+				    NULL,
+				    b_size);
+	if (ret_blob.data == NULL) {
+		return data_blob_null;
+	}
+
+	/* number of hard links */
+	PUSH_LE_U32(ret_blob.data, 0, psbuf->st_ex_nlink);
+
+	/* Reparse tag if FILE_FLAG_REPARSE is set, else zero. */
+	PUSH_LE_U32(ret_blob.data, 4, reparse_tag);
+
+	/*
+	 * Remove type info from mode, leaving only the
+	 * permissions and setuid/gid bits.
+	 */
+	PUSH_LE_U32(ret_blob.data,
+		    8,
+		    unix_perms_to_wire(psbuf->st_ex_mode & ~S_IFMT));
+
+	/* Now add in the owner and group sids. */
+	sid_linearize(ret_blob.data + 12,
+		      b_size - 12,
+		      &sid_owner);
+	sid_linearize(ret_blob.data + 12 + owner_sid_size,
+		      b_size - owner_sid_size - 12,
+		      &sid_group);
+	return ret_blob;
+}
+
+/*
+ * SMB2 POSIX info level.
+ */
+DATA_BLOB store_smb2_posix_info(TALLOC_CTX *mem_ctx,
+				connection_struct *conn,
+				const SMB_STRUCT_STAT *psbuf,
+				uint32_t reparse_tag,
+				uint32_t dos_attributes)
+{
+	uint64_t file_id = SMB_VFS_FS_FILE_ID(conn, psbuf);
+	DATA_BLOB ret_blob = data_blob_null;
+	DATA_BLOB cc = smb2_posix_cc_info(mem_ctx,
+					conn,
+					reparse_tag,
+					psbuf);
+	if (cc.data == NULL) {
+		return data_blob_null;
+	}
+
+	if (cc.length + 68 < 68) {
+		data_blob_free(&cc);
+		return data_blob_null;
+	}
+
+	ret_blob = data_blob_talloc(mem_ctx,
+				NULL,
+				cc.length + 68);
+	if (ret_blob.data == NULL) {
+		data_blob_free(&cc);
+		return data_blob_null;
+	}
+
+	/* Timestamps. */
+
+	/* Birth (creation) time. */
+	put_long_date_timespec(TIMESTAMP_SET_NT_OR_BETTER,
+			       (char *)ret_blob.data+0,
+			       psbuf->st_ex_btime);
+	/* Access time. */
+	put_long_date_timespec(TIMESTAMP_SET_NT_OR_BETTER,
+			       (char *)ret_blob.data+8,
+			       psbuf->st_ex_atime);
+	/* Last write time. */
+	put_long_date_timespec(TIMESTAMP_SET_NT_OR_BETTER,
+			       (char *)ret_blob.data+16,
+			       psbuf->st_ex_mtime);
+	/* Change time. */
+	put_long_date_timespec(TIMESTAMP_SET_NT_OR_BETTER,
+			       (char *)ret_blob.data+24,
+			       psbuf->st_ex_ctime);
+
+	/* File size 64 Bit */
+	SOFF_T(ret_blob.data,32, get_file_size_stat(psbuf));
+
+	/* Number of bytes used on disk - 64 Bit */
+	SOFF_T(ret_blob.data,40,SMB_VFS_GET_ALLOC_SIZE(conn,NULL,psbuf));
+
+	/* DOS attributes */
+	if (S_ISREG(psbuf->st_ex_mode)) {
+		PUSH_LE_U32(ret_blob.data, 48, dos_attributes);
+	} else if (S_ISDIR(psbuf->st_ex_mode)) {
+		PUSH_LE_U32(ret_blob.data,
+			    48,
+			    dos_attributes|FILE_ATTRIBUTE_DIRECTORY);
+	} else {
+		/*
+		 * All non-directory or regular files are reported
+		 * as reparse points. Client may or may not be able
+		 * to access these.
+		 */
+		PUSH_LE_U32(ret_blob.data,
+			    48,
+			    FILE_ATTRIBUTE_REPARSE_POINT);
+	}
+
+	/* Add the inode and dev (16 bytes). */
+	PUSH_LE_U64(ret_blob.data, 52, file_id);
+	PUSH_LE_U64(ret_blob.data, 60, psbuf->st_ex_dev);
+
+	/*
+	 * Append a POSIX create context (variable bytes).
+	 */
+	memcpy(ret_blob.data + 68, cc.data, cc.length);
+	data_blob_free(&cc);
+	return ret_blob;
+}

source3/wscript_build

@@ -675,6 +675,7 @@ bld.SAMBA3_LIBRARY('smbd_base',
                           smbd/smb2_getinfo.c
                           smbd/smb2_setinfo.c
                           smbd/smb2_break.c
+                          smbd/smb2_posix.c
                           smbd/smbXsrv_version.c
                           smbd/smbXsrv_client.c
                           smbd/smbXsrv_session.c