cifsd: add server-side procedures for SMB3

This adds smb3 engine, NTLM/NTLMv2/Kerberos authentication, oplock/lease
cache mechanism for cifsd.

Signed-off-by: Namjae Jeon <[email protected]>
Signed-off-by: Sergey Senozhatsky <[email protected]>
Signed-off-by: Hyunchul Lee <[email protected]>
Acked-by: Ronnie Sahlberg <[email protected]>
Signed-off-by: Steve French <[email protected]>

Author: namjaejeon

fs/cifsd/asn1.c

@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * The ASB.1/BER parsing code is derived from ip_nat_snmp_basic.c which was in
+ * turn derived from the gxsnmp package by Gregory McLean & Jochen Friedrich
+ *
+ * Copyright (c) 2000 RP Internet (www.rpi.net.au).
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#ifndef __ASN1_H__
+#define __ASN1_H__
+
+int ksmbd_decode_negTokenInit(unsigned char *security_blob,
+			      int length,
+			      struct ksmbd_conn *conn);
+
+int ksmbd_decode_negTokenTarg(unsigned char *security_blob,
+			      int length,
+			      struct ksmbd_conn *conn);
+
+int build_spnego_ntlmssp_neg_blob(unsigned char **pbuffer,
+				  u16 *buflen,
+				  char *ntlm_blob,
+				  int ntlm_blob_len);
+
+int build_spnego_ntlmssp_auth_blob(unsigned char **pbuffer,
+				   u16 *buflen,
+				   int neg_result);
+#endif /* __ASN1_H__ */