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-rw-r--r--fs/smb/client/asn1.c63
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;
+}