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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_noise_h__
#define __included_wg_noise_h__
#include <vlib/vlib.h>
#include <vnet/crypto/crypto.h>
#include <wireguard/blake/blake2s.h>
#include <wireguard/wireguard_key.h>
#define NOISE_PUBLIC_KEY_LEN CURVE25519_KEY_SIZE
#define NOISE_SYMMETRIC_KEY_LEN 32 // CHACHA20POLY1305_KEY_SIZE
#define NOISE_TIMESTAMP_LEN (sizeof(uint64_t) + sizeof(uint32_t))
#define NOISE_AUTHTAG_LEN 16 //CHACHA20POLY1305_AUTHTAG_SIZE
#define NOISE_HASH_LEN BLAKE2S_HASH_SIZE
/* Protocol string constants */
#define NOISE_HANDSHAKE_NAME "Noise_IKpsk2_25519_ChaChaPoly_BLAKE2s"
#define NOISE_IDENTIFIER_NAME "WireGuard v1 zx2c4 Jason@zx2c4.com"
/* Constants for the counter */
#define COUNTER_BITS_TOTAL 8192
#define COUNTER_BITS (sizeof(unsigned long) * 8)
#define COUNTER_NUM (COUNTER_BITS_TOTAL / COUNTER_BITS)
#define COUNTER_WINDOW_SIZE (COUNTER_BITS_TOTAL - COUNTER_BITS)
/* Constants for the keypair */
#define REKEY_AFTER_MESSAGES (1ull << 60)
#define REJECT_AFTER_MESSAGES (UINT64_MAX - COUNTER_WINDOW_SIZE - 1)
#define REKEY_AFTER_TIME 120
#define REKEY_AFTER_TIME_RECV 165
#define REJECT_AFTER_TIME 180
#define REJECT_INTERVAL (0.02) /* fifty times per sec */
/* 24 = floor(log2(REJECT_INTERVAL)) */
#define REJECT_INTERVAL_MASK (~((1ull<<24)-1))
enum noise_state_crypt
{
SC_OK = 0,
SC_CONN_RESET,
SC_KEEP_KEY_FRESH,
SC_FAILED,
};
enum noise_state_hs
{
HS_ZEROED = 0,
CREATED_INITIATION,
CONSUMED_INITIATION,
CREATED_RESPONSE,
CONSUMED_RESPONSE,
};
typedef struct noise_handshake
{
enum noise_state_hs hs_state;
uint32_t hs_local_index;
uint32_t hs_remote_index;
uint8_t hs_e[NOISE_PUBLIC_KEY_LEN];
uint8_t hs_hash[NOISE_HASH_LEN];
uint8_t hs_ck[NOISE_HASH_LEN];
} noise_handshake_t;
typedef struct noise_counter
{
uint64_t c_send;
uint64_t c_recv;
unsigned long c_backtrack[COUNTER_NUM];
} noise_counter_t;
typedef struct noise_keypair
{
int kp_valid;
int kp_is_initiator;
uint32_t kp_local_index;
uint32_t kp_remote_index;
vnet_crypto_key_index_t kp_send_index;
vnet_crypto_key_index_t kp_recv_index;
f64 kp_birthdate;
noise_counter_t kp_ctr;
} noise_keypair_t;
typedef struct noise_local noise_local_t;
typedef struct noise_remote
{
uint32_t r_peer_idx;
uint8_t r_public[NOISE_PUBLIC_KEY_LEN];
uint32_t r_local_idx;
uint8_t r_ss[NOISE_PUBLIC_KEY_LEN];
noise_handshake_t r_handshake;
uint8_t r_psk[NOISE_SYMMETRIC_KEY_LEN];
uint8_t r_timestamp[NOISE_TIMESTAMP_LEN];
f64 r_last_init;
clib_rwlock_t r_keypair_lock;
noise_keypair_t *r_next, *r_current, *r_previous;
} noise_remote_t;
typedef struct noise_local
{
uint8_t l_public[NOISE_PUBLIC_KEY_LEN];
uint8_t l_private[NOISE_PUBLIC_KEY_LEN];
struct noise_upcall
{
void *u_arg;
noise_remote_t *(*u_remote_get) (const uint8_t[NOISE_PUBLIC_KEY_LEN]);
uint32_t (*u_index_set) (noise_remote_t *);
void (*u_index_drop) (uint32_t);
} l_upcall;
} noise_local_t;
/* pool of noise_local */
extern noise_local_t *noise_local_pool;
/* Set/Get noise parameters */
static_always_inline noise_local_t *
noise_local_get (uint32_t locali)
{
return (pool_elt_at_index (noise_local_pool, locali));
}
void noise_local_init (noise_local_t *, struct noise_upcall *);
bool noise_local_set_private (noise_local_t *,
const uint8_t[NOISE_PUBLIC_KEY_LEN]);
void noise_remote_init (noise_remote_t *, uint32_t,
const uint8_t[NOISE_PUBLIC_KEY_LEN], uint32_t);
/* Should be called anytime noise_local_set_private is called */
void noise_remote_precompute (noise_remote_t *);
/* Cryptographic functions */
bool noise_create_initiation (vlib_main_t * vm, noise_remote_t *,
uint32_t * s_idx,
uint8_t ue[NOISE_PUBLIC_KEY_LEN],
uint8_t es[NOISE_PUBLIC_KEY_LEN +
NOISE_AUTHTAG_LEN],
uint8_t ets[NOISE_TIMESTAMP_LEN +
NOISE_AUTHTAG_LEN]);
bool noise_consume_initiation (vlib_main_t * vm, noise_local_t *,
noise_remote_t **,
uint32_t s_idx,
uint8_t ue[NOISE_PUBLIC_KEY_LEN],
uint8_t es[NOISE_PUBLIC_KEY_LEN +
NOISE_AUTHTAG_LEN],
uint8_t ets[NOISE_TIMESTAMP_LEN +
NOISE_AUTHTAG_LEN]);
bool noise_create_response (vlib_main_t * vm, noise_remote_t *,
uint32_t * s_idx,
uint32_t * r_idx,
uint8_t ue[NOISE_PUBLIC_KEY_LEN],
uint8_t en[0 + NOISE_AUTHTAG_LEN]);
bool noise_consume_response (vlib_main_t * vm, noise_remote_t *,
uint32_t s_idx,
uint32_t r_idx,
uint8_t ue[NOISE_PUBLIC_KEY_LEN],
uint8_t en[0 + NOISE_AUTHTAG_LEN]);
bool noise_remote_begin_session (vlib_main_t * vm, noise_remote_t * r);
void noise_remote_clear (vlib_main_t * vm, noise_remote_t * r);
void noise_remote_expire_current (noise_remote_t * r);
bool noise_remote_ready (noise_remote_t *);
enum noise_state_crypt
noise_remote_encrypt (vlib_main_t * vm, noise_remote_t *,
uint32_t * r_idx,
uint64_t * nonce,
uint8_t * src, size_t srclen, uint8_t * dst);
enum noise_state_crypt
noise_remote_decrypt (vlib_main_t * vm, noise_remote_t *,
uint32_t r_idx,
uint64_t nonce,
uint8_t * src, size_t srclen, uint8_t * dst);
#endif /* __included_wg_noise_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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