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/* SPDX-License-Identifier: ISC
*
* Copyright (C) 2015-2021 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
* Copyright (C) 2019-2021 Matt Dunwoodie <ncon@noconroy.net>
*/
#ifndef __COOKIE_H__
#define __COOKIE_H__
#include <sys/types.h>
#include <sys/time.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <crypto/siphash/siphash.h>
#include "crypto.h"
#define COOKIE_MAC_SIZE 16
#define COOKIE_KEY_SIZE 32
#define COOKIE_NONCE_SIZE XCHACHA20POLY1305_NONCE_SIZE
#define COOKIE_COOKIE_SIZE 16
#define COOKIE_SECRET_SIZE 32
#define COOKIE_INPUT_SIZE 32
#define COOKIE_ENCRYPTED_SIZE (COOKIE_COOKIE_SIZE + COOKIE_MAC_SIZE)
struct cookie_macs {
uint8_t mac1[COOKIE_MAC_SIZE];
uint8_t mac2[COOKIE_MAC_SIZE];
};
struct cookie_maker {
uint8_t cm_mac1_key[COOKIE_KEY_SIZE];
uint8_t cm_cookie_key[COOKIE_KEY_SIZE];
struct rwlock cm_lock;
bool cm_cookie_valid;
uint8_t cm_cookie[COOKIE_COOKIE_SIZE];
sbintime_t cm_cookie_birthdate; /* sbinuptime */
bool cm_mac1_sent;
uint8_t cm_mac1_last[COOKIE_MAC_SIZE];
};
struct cookie_checker {
struct rwlock cc_key_lock;
uint8_t cc_mac1_key[COOKIE_KEY_SIZE];
uint8_t cc_cookie_key[COOKIE_KEY_SIZE];
struct mtx cc_secret_mtx;
sbintime_t cc_secret_birthdate; /* sbinuptime */
uint8_t cc_secret[COOKIE_SECRET_SIZE];
};
int cookie_init(void);
void cookie_deinit(void);
void cookie_checker_init(struct cookie_checker *);
void cookie_checker_free(struct cookie_checker *);
void cookie_checker_update(struct cookie_checker *,
const uint8_t[COOKIE_INPUT_SIZE]);
void cookie_checker_create_payload(struct cookie_checker *,
struct cookie_macs *cm, uint8_t[COOKIE_NONCE_SIZE],
uint8_t [COOKIE_ENCRYPTED_SIZE], struct sockaddr *);
void cookie_maker_init(struct cookie_maker *, const uint8_t[COOKIE_INPUT_SIZE]);
void cookie_maker_free(struct cookie_maker *);
int cookie_maker_consume_payload(struct cookie_maker *,
uint8_t[COOKIE_NONCE_SIZE], uint8_t[COOKIE_ENCRYPTED_SIZE]);
void cookie_maker_mac(struct cookie_maker *, struct cookie_macs *,
void *, size_t);
int cookie_checker_validate_macs(struct cookie_checker *,
struct cookie_macs *, void *, size_t, bool, struct sockaddr *,
struct vnet *);
#ifdef SELFTESTS
bool cookie_selftest(void);
#endif /* SELFTESTS */
#endif /* __COOKIE_H__ */
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