/*
 *  Unix SMB/CIFS implementation.
 *  Version 3.0
 *  NTLMSSP Signing routines
 *  Copyright (C) Luke Kenneth Casson Leighton 1996-2001
 *  Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003-2005
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "includes.h"
#include "auth/ntlmssp/ntlmssp.h"
#include "auth/gensec/gensec.h"
#include "auth/gensec/gensec_internal.h"
#include "auth/ntlmssp/ntlmssp_private.h"

NTSTATUS gensec_ntlmssp_magic(struct gensec_security *gensec_security,
			      const DATA_BLOB *first_packet)
{
	if (ntlmssp_blob_matches_magic(first_packet)) {
		return NT_STATUS_OK;
	} else {
		return NT_STATUS_INVALID_PARAMETER;
	}
}

/**
 * Return the NTLMSSP master session key
 *
 * @param ntlmssp_state NTLMSSP State
 */

NTSTATUS gensec_ntlmssp_session_key(struct gensec_security *gensec_security,
				    TALLOC_CTX *mem_ctx,
				    DATA_BLOB *session_key)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(gensec_security->private_data,
				      struct gensec_ntlmssp_context);
	struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;

	if (ntlmssp_state->expected_state != NTLMSSP_DONE) {
		return NT_STATUS_NO_USER_SESSION_KEY;
	}

	if (!ntlmssp_state->session_key.data) {
		return NT_STATUS_NO_USER_SESSION_KEY;
	}
	*session_key = data_blob_talloc_s(mem_ctx,
					  ntlmssp_state->session_key.data,
					  ntlmssp_state->session_key.length);
	if (!session_key->data) {
		return NT_STATUS_NO_MEMORY;
	}

	return NT_STATUS_OK;
}

bool gensec_ntlmssp_have_feature(struct gensec_security *gensec_security,
				 uint32_t feature)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(gensec_security->private_data,
				      struct gensec_ntlmssp_context);
	struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;

	if (feature & GENSEC_FEATURE_SIGN) {
		if (!ntlmssp_state->session_key.length) {
			return false;
		}
		if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
			return true;
		}
	}
	if (feature & GENSEC_FEATURE_SEAL) {
		if (!ntlmssp_state->session_key.length) {
			return false;
		}
		if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
			return true;
		}
	}
	if (feature & GENSEC_FEATURE_SESSION_KEY) {
		if (ntlmssp_state->session_key.length) {
			return true;
		}
	}
	if (feature & GENSEC_FEATURE_DCE_STYLE) {
		return true;
	}
	if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
		if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
			return true;
		}
	}
	if (feature & GENSEC_FEATURE_SIGN_PKT_HEADER) {
		return true;
	}
	if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
		if (!ntlmssp_state->session_key.length) {
			return false;
		}
		if (!(ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
			return false;
		}
		return ntlmssp_state->new_spnego;
	}

	return false;
}

NTSTATUS gensec_ntlmssp_start(struct gensec_security *gensec_security)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp;

	gensec_ntlmssp = talloc_zero(gensec_security,
				     struct gensec_ntlmssp_context);
	if (!gensec_ntlmssp) {
		return NT_STATUS_NO_MEMORY;
	}

	gensec_security->private_data = gensec_ntlmssp;
	return NT_STATUS_OK;
}

NTSTATUS gensec_ntlmssp_sign_packet(struct gensec_security *gensec_security,
				    TALLOC_CTX *sig_mem_ctx,
				    const uint8_t *data, size_t length,
				    const uint8_t *whole_pdu, size_t pdu_length,
				    DATA_BLOB *sig)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(gensec_security->private_data,
				      struct gensec_ntlmssp_context);
	NTSTATUS nt_status;

	nt_status = ntlmssp_sign_packet(gensec_ntlmssp->ntlmssp_state,
					sig_mem_ctx,
					data, length,
					whole_pdu, pdu_length,
					sig);

	return nt_status;
}

NTSTATUS gensec_ntlmssp_check_packet(struct gensec_security *gensec_security,
				     const uint8_t *data, size_t length,
				     const uint8_t *whole_pdu, size_t pdu_length,
				     const DATA_BLOB *sig)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(gensec_security->private_data,
				      struct gensec_ntlmssp_context);
	NTSTATUS nt_status;

	nt_status = ntlmssp_check_packet(gensec_ntlmssp->ntlmssp_state,
					 data, length,
					 whole_pdu, pdu_length,
					 sig);

	return nt_status;
}

NTSTATUS gensec_ntlmssp_seal_packet(struct gensec_security *gensec_security,
				    TALLOC_CTX *sig_mem_ctx,
				    uint8_t *data, size_t length,
				    const uint8_t *whole_pdu, size_t pdu_length,
				    DATA_BLOB *sig)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(gensec_security->private_data,
				      struct gensec_ntlmssp_context);
	NTSTATUS nt_status;

	nt_status = ntlmssp_seal_packet(gensec_ntlmssp->ntlmssp_state,
					sig_mem_ctx,
					data, length,
					whole_pdu, pdu_length,
					sig);

	return nt_status;
}

/*
  wrappers for the ntlmssp_*() functions
*/
NTSTATUS gensec_ntlmssp_unseal_packet(struct gensec_security *gensec_security,
				      uint8_t *data, size_t length,
				      const uint8_t *whole_pdu, size_t pdu_length,
				      const DATA_BLOB *sig)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(gensec_security->private_data,
				      struct gensec_ntlmssp_context);
	NTSTATUS nt_status;

	nt_status = ntlmssp_unseal_packet(gensec_ntlmssp->ntlmssp_state,
					  data, length,
					  whole_pdu, pdu_length,
					  sig);

	return nt_status;
}

size_t gensec_ntlmssp_sig_size(struct gensec_security *gensec_security, size_t data_size)
{
	return NTLMSSP_SIG_SIZE;
}

NTSTATUS gensec_ntlmssp_wrap(struct gensec_security *gensec_security,
			     TALLOC_CTX *out_mem_ctx,
			     const DATA_BLOB *in,
			     DATA_BLOB *out)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(gensec_security->private_data,
				      struct gensec_ntlmssp_context);

	return ntlmssp_wrap(gensec_ntlmssp->ntlmssp_state,
			    out_mem_ctx,
			    in, out);
}


NTSTATUS gensec_ntlmssp_unwrap(struct gensec_security *gensec_security,
			       TALLOC_CTX *out_mem_ctx,
			       const DATA_BLOB *in,
			       DATA_BLOB *out)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(gensec_security->private_data,
				      struct gensec_ntlmssp_context);

	return ntlmssp_unwrap(gensec_ntlmssp->ntlmssp_state,
			      out_mem_ctx,
			      in, out);
}
