1 files changed, 63 insertions, 0 deletions
diff --git a/fs/smb/client/asn1.c b/fs/smb/client/asn1.c
new file mode 100644
index 000000000000..b5724ef9f182
--- /dev/null
+++ b/fs/smb/client/asn1.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/oid_registry.h>
+#include "cifsglob.h"
+#include "cifs_debug.h"
+#include "cifsproto.h"
+#include "cifs_spnego_negtokeninit.asn1.h"
+
+int
+decode_negTokenInit(unsigned char *security_blob, int length,
+		    struct TCP_Server_Info *server)
+{
+	if (asn1_ber_decoder(&cifs_spnego_negtokeninit_decoder, server,
+			     security_blob, length) == 0)
+		return 1;
+	else
+		return 0;
+}
+
+int cifs_gssapi_this_mech(void *context, size_t hdrlen,
+			  unsigned char tag, const void *value, size_t vlen)
+{
+	enum OID oid;
+
+	oid = look_up_OID(value, vlen);
+	if (oid != OID_spnego) {
+		char buf[50];
+
+		sprint_oid(value, vlen, buf, sizeof(buf));
+		cifs_dbg(FYI, "Error decoding negTokenInit header: unexpected OID %s\n",
+			 buf);
+		return -EBADMSG;
+	}
+	return 0;
+}
+
+int cifs_neg_token_init_mech_type(void *context, size_t hdrlen,
+				  unsigned char tag,
+				  const void *value, size_t vlen)
+{
+	struct TCP_Server_Info *server = context;
+	enum OID oid;
+
+	oid = look_up_OID(value, vlen);
+	if (oid == OID_mskrb5)
+		server->sec_mskerberos = true;
+	else if (oid == OID_krb5u2u)
+		server->sec_kerberosu2u = true;
+	else if (oid == OID_krb5)
+		server->sec_kerberos = true;
+	else if (oid == OID_ntlmssp)
+		server->sec_ntlmssp = true;
+	else {
+		char buf[50];
+
+		sprint_oid(value, vlen, buf, sizeof(buf));
+		cifs_dbg(FYI, "Decoding negTokenInit: unsupported OID %s\n",
+			 buf);
+	}
+	return 0;
+}