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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2019
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
Header file for NTP authentication
*/
#ifndef GOT_NTP_AUTH_H
#define GOT_NTP_AUTH_H
#include "addressing.h"
#include "ntp.h"
#include "reports.h"
typedef struct NAU_Instance_Record *NAU_Instance;
/* Create an authenticator instance in a specific mode */
extern NAU_Instance NAU_CreateNoneInstance(void);
extern NAU_Instance NAU_CreateSymmetricInstance(uint32_t key_id);
extern NAU_Instance NAU_CreateNtsInstance(IPSockAddr *nts_address, const char *name,
const IPSockAddr *ntp_address);
/* Destroy an instance */
extern void NAU_DestroyInstance(NAU_Instance instance);
/* Check if an instance is not in the None mode */
extern int NAU_IsAuthEnabled(NAU_Instance instance);
/* Get NTP version recommended for better compatibility */
extern int NAU_GetSuggestedNtpVersion(NAU_Instance instance);
/* Perform operations necessary for NAU_GenerateRequestAuth() */
extern int NAU_PrepareRequestAuth(NAU_Instance instance);
/* Extend a request with data required by the authentication mode */
extern int NAU_GenerateRequestAuth(NAU_Instance instance, NTP_Packet *request,
NTP_PacketInfo *info);
/* Parse a request or response to detect the authentication mode */
extern int NAU_ParsePacket(NTP_Packet *packet, NTP_PacketInfo *info);
/* Verify that a request is authentic. If it is not authentic and a non-zero
kod code is returned, a KoD response should be sent back. */
extern int NAU_CheckRequestAuth(NTP_Packet *request, NTP_PacketInfo *info, uint32_t *kod);
/* Extend a response with data required by the authentication mode. This
function can be called only if the previous call of NAU_CheckRequestAuth()
was on the same request. */
extern int NAU_GenerateResponseAuth(NTP_Packet *request, NTP_PacketInfo *request_info,
NTP_Packet *response, NTP_PacketInfo *response_info,
NTP_Remote_Address *remote_addr,
NTP_Local_Address *local_addr,
uint32_t kod);
/* Verify that a response is authentic */
extern int NAU_CheckResponseAuth(NAU_Instance instance, NTP_Packet *response,
NTP_PacketInfo *info);
/* Change an authentication-specific address (e.g. after replacing a source) */
extern void NAU_ChangeAddress(NAU_Instance instance, IPAddr *address);
/* Save authentication-specific data to speed up the next start */
extern void NAU_DumpData(NAU_Instance instance);
/* Provide a report about the current authentication state */
extern void NAU_GetReport(NAU_Instance instance, RPT_AuthReport *report);
#endif
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