/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * Transport Layer Security
 *
 * Copyright 2011-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef FREERDP_LIB_CRYPTO_TLS_H
#define FREERDP_LIB_CRYPTO_TLS_H

#include <winpr/crt.h>
#include <winpr/sspi.h>

#include <openssl/ssl.h>
#include <openssl/err.h>

#include <freerdp/api.h>
#include <freerdp/types.h>
#include <freerdp/crypto/certificate_store.h>

#include <winpr/stream.h>

#define TLS_ALERT_LEVEL_WARNING 1
#define TLS_ALERT_LEVEL_FATAL 2

#define TLS_ALERT_DESCRIPTION_CLOSE_NOTIFY 0
#define TLS_ALERT_DESCRIPTION_UNEXPECTED_MESSAGE 10
#define TLS_ALERT_DESCRIPTION_BAD_RECORD_MAC 20
#define TLS_ALERT_DESCRIPTION_DECRYPTION_FAILED 21
#define TLS_ALERT_DESCRIPTION_RECORD_OVERFLOW 22
#define TLS_ALERT_DESCRIPTION_DECOMPRESSION_FAILURE 30
#define TLS_ALERT_DESCRIPTION_HANSHAKE_FAILURE 40
#define TLS_ALERT_DESCRIPTION_NO_CERTIFICATE 41
#define TLS_ALERT_DESCRIPTION_BAD_CERTIFICATE 42
#define TLS_ALERT_DESCRIPTION_UNSUPPORTED_CERTIFICATE 43
#define TLS_ALERT_DESCRIPTION_CERTIFICATE_REVOKED 44
#define TLS_ALERT_DESCRIPTION_CERTIFICATE_EXPIRED 45
#define TLS_ALERT_DESCRIPTION_CERTIFICATE_UNKNOWN 46
#define TLS_ALERT_DESCRIPTION_ILLEGAL_PARAMETER 47
#define TLS_ALERT_DESCRIPTION_UNKNOWN_CA 48
#define TLS_ALERT_DESCRIPTION_ACCESS_DENIED 49
#define TLS_ALERT_DESCRIPTION_DECODE_ERROR 50
#define TLS_ALERT_DESCRIPTION_DECRYPT_ERROR 51
#define TLS_ALERT_DESCRIPTION_EXPORT_RESTRICTION 60
#define TLS_ALERT_DESCRIPTION_PROTOCOL_VERSION 70
#define TLS_ALERT_DESCRIPTION_INSUFFICIENT_SECURITY 71
#define TLS_ALERT_DESCRIPTION_INTERNAL_ERROR 80
#define TLS_ALERT_DESCRIPTION_USER_CANCELED 90
#define TLS_ALERT_DESCRIPTION_NO_RENEGOTIATION 100
#define TLS_ALERT_DESCRIPTION_UNSUPPORTED_EXTENSION 110

typedef struct rdp_tls rdpTls;

struct rdp_tls
{
	SSL* ssl;
	BIO* bio;
	void* tsg;
	SSL_CTX* ctx;
	BYTE* PublicKey;
	DWORD PublicKeyLength;
	rdpSettings* settings;
	SecPkgContext_Bindings* Bindings;
	rdpCertificateStore* certificate_store;
	BIO* underlying;
	const char* hostname;
	int port;
	int alertLevel;
	int alertDescription;
	BOOL isGatewayTransport;
	BOOL isClientMode;
};

/** @brief result of a handshake operation */
typedef enum
{
	TLS_HANDSHAKE_SUCCESS,     /*!< handshake was successful */
	TLS_HANDSHAKE_CONTINUE,    /*!< handshake is not completed */
	TLS_HANDSHAKE_ERROR,       /*!< an error (probably IO error) happened */
	TLS_HANDSHAKE_VERIFY_ERROR /*!< Certificate verification failed (client mode) */
} TlsHandshakeResult;

#ifdef __cplusplus
extern "C"
{
#endif

	FREERDP_LOCAL const SSL_METHOD* freerdp_tls_get_ssl_method(BOOL isDtls, BOOL isClient);

	FREERDP_LOCAL int freerdp_tls_connect(rdpTls* tls, BIO* underlying);

	FREERDP_LOCAL TlsHandshakeResult freerdp_tls_connect_ex(rdpTls* tls, BIO* underlying,
	                                                        const SSL_METHOD* methods);

	FREERDP_LOCAL BOOL freerdp_tls_accept(rdpTls* tls, BIO* underlying, rdpSettings* settings);

	FREERDP_LOCAL TlsHandshakeResult freerdp_tls_accept_ex(rdpTls* tls, BIO* underlying,
	                                                       rdpSettings* settings,
	                                                       const SSL_METHOD* methods);

	FREERDP_LOCAL TlsHandshakeResult freerdp_tls_handshake(rdpTls* tls);

	FREERDP_LOCAL BOOL freerdp_tls_send_alert(rdpTls* tls);

	FREERDP_LOCAL int freerdp_tls_write_all(rdpTls* tls, const BYTE* data, int length);

	FREERDP_LOCAL int freerdp_tls_set_alert_code(rdpTls* tls, int level, int description);

	FREERDP_LOCAL rdpTls* freerdp_tls_new(rdpSettings* settings);
	FREERDP_LOCAL void freerdp_tls_free(rdpTls* tls);

#ifdef __cplusplus
}
#endif

#endif /* FREERDP_LIB_CRYPTO_TLS_H */