// 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 if (oid == OID_IAKerb)
                server->sec_iakerb = true;
        else {
                char buf[50];

                sprint_oid(value, vlen, buf, sizeof(buf));
                cifs_dbg(FYI, "Decoding negTokenInit: unsupported OID %s\n",
                         buf);
        }
        return 0;
}