From: Ralph Boehme <slow@samba.org>
Date: Thu, 5 Mar 2020 14:14:21 +0000 (+0100)
Subject: smbd: add is_lease_stat_open()
X-Git-Tag: ldb-2.2.0~788
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9b0a31af128f9ec2551b6cca7200903d8e24a6f4;p=thirdparty%2Fsamba.git

smbd: add is_lease_stat_open()

This adds a leases specific stat opens access mask check function.

See also:

https://lists.samba.org/archive/cifs-protocol/2020-March/003409.html

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14357

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
---

diff --git a/source3/smbd/open.c b/source3/smbd/open.c
index b5160300e48..3cd8f156ab6 100644
--- a/source3/smbd/open.c
+++ b/source3/smbd/open.c
@@ -1577,6 +1577,21 @@ bool is_oplock_stat_open(uint32_t access_mask)
 		((access_mask & ~stat_open_bits) == 0));
 }
 
+/**
+ * Allowed access mask for stat opens relevant to leases
+ **/
+bool is_lease_stat_open(uint32_t access_mask)
+{
+	const uint32_t stat_open_bits =
+		(SYNCHRONIZE_ACCESS|
+		 FILE_READ_ATTRIBUTES|
+		 FILE_WRITE_ATTRIBUTES|
+		 READ_CONTROL_ACCESS);
+
+	return (((access_mask &  stat_open_bits) != 0) &&
+		((access_mask & ~stat_open_bits) == 0));
+}
+
 struct has_delete_on_close_state {
 	bool ret;
 };
diff --git a/source3/smbd/proto.h b/source3/smbd/proto.h
index 5713620ab6e..dadccf189bb 100644
--- a/source3/smbd/proto.h
+++ b/source3/smbd/proto.h
@@ -714,6 +714,7 @@ void change_file_owner_to_parent(connection_struct *conn,
 				 struct smb_filename *inherit_from_dir,
 				 files_struct *fsp);
 bool is_oplock_stat_open(uint32_t access_mask);
+bool is_lease_stat_open(uint32_t access_mask);
 NTSTATUS send_break_message(struct messaging_context *msg_ctx,
 			    const struct file_id *id,
 			    const struct share_mode_entry *exclusive,