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/*
* Copyright (c) 2020 Doc.ai and/or its affiliates.
* Copyright (c) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>.
* Copyright (c) 2019-2020 Matt Dunwoodie <ncon@noconroy.net>.
* 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 __included_wg_cookie_h__
#define __included_wg_cookie_h__
#include <vnet/ip/ip46_address.h>
#include <wireguard/wireguard_noise.h>
enum cookie_mac_state
{
INVALID_MAC,
VALID_MAC_BUT_NO_COOKIE,
VALID_MAC_WITH_COOKIE,
VALID_MAC_WITH_COOKIE_BUT_RATELIMITED,
};
#define COOKIE_MAC_SIZE 16
#define COOKIE_KEY_SIZE 32
#define COOKIE_NONCE_SIZE 24
#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)
#define COOKIE_MAC1_KEY_LABEL "mac1----"
#define COOKIE_COOKIE_KEY_LABEL "cookie--"
#define COOKIE_SECRET_MAX_AGE 120
#define COOKIE_SECRET_LATENCY 5
/* Constants for initiation rate limiting */
#define RATELIMIT_SIZE (1 << 13)
#define RATELIMIT_SIZE_MAX (RATELIMIT_SIZE * 8)
#define NSEC_PER_SEC 1000000000LL
#define INITIATIONS_PER_SECOND 20
#define INITIATIONS_BURSTABLE 5
#define INITIATION_COST (NSEC_PER_SEC / INITIATIONS_PER_SECOND)
#define TOKEN_MAX (INITIATION_COST * INITIATIONS_BURSTABLE)
#define ELEMENT_TIMEOUT 1
typedef struct cookie_macs
{
uint8_t mac1[COOKIE_MAC_SIZE];
uint8_t mac2[COOKIE_MAC_SIZE];
} message_macs_t;
typedef struct ratelimit_entry
{
f64 r_last_time;
u64 r_tokens;
} ratelimit_entry_t;
typedef struct ratelimit
{
ratelimit_entry_t *rl_pool;
uword *rl_table;
f64 rl_last_gc;
} ratelimit_t;
typedef struct cookie_maker
{
uint8_t cp_mac1_key[COOKIE_KEY_SIZE];
uint8_t cp_cookie_key[COOKIE_KEY_SIZE];
uint8_t cp_cookie[COOKIE_COOKIE_SIZE];
f64 cp_birthdate;
int cp_mac1_valid;
uint8_t cp_mac1_last[COOKIE_MAC_SIZE];
} cookie_maker_t;
typedef struct cookie_checker
{
ratelimit_t cc_ratelimit_v4;
ratelimit_t cc_ratelimit_v6;
uint8_t cc_mac1_key[COOKIE_KEY_SIZE];
uint8_t cc_cookie_key[COOKIE_KEY_SIZE];
f64 cc_secret_birthdate;
uint8_t cc_secret[COOKIE_SECRET_SIZE];
} cookie_checker_t;
void cookie_maker_init (cookie_maker_t *, const uint8_t[COOKIE_INPUT_SIZE]);
void cookie_checker_init (cookie_checker_t *, ratelimit_entry_t *);
void cookie_checker_update (cookie_checker_t *, uint8_t[COOKIE_INPUT_SIZE]);
void cookie_checker_deinit (cookie_checker_t *);
void cookie_checker_create_payload (vlib_main_t *vm, cookie_checker_t *cc,
message_macs_t *cm,
uint8_t nonce[COOKIE_NONCE_SIZE],
uint8_t ecookie[COOKIE_ENCRYPTED_SIZE],
ip46_address_t *ip, u16 udp_port);
bool cookie_maker_consume_payload (vlib_main_t *vm, cookie_maker_t *cp,
uint8_t nonce[COOKIE_NONCE_SIZE],
uint8_t ecookie[COOKIE_ENCRYPTED_SIZE]);
void cookie_maker_mac (cookie_maker_t *, message_macs_t *, void *, size_t);
enum cookie_mac_state
cookie_checker_validate_macs (vlib_main_t *vm, cookie_checker_t *,
message_macs_t *, void *, size_t, bool,
ip46_address_t *ip, u16 udp_port);
#endif /* __included_wg_cookie_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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