136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#ifndef _WG_NOISE_H
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#define _WG_NOISE_H
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#include "messages.h"
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#include "peerlookup.h"
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/atomic.h>
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#include <linux/rwsem.h>
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#include <linux/mutex.h>
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#include <linux/kref.h>
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struct noise_replay_counter {
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u64 counter;
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spinlock_t lock;
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unsigned long backtrack[COUNTER_BITS_TOTAL / BITS_PER_LONG];
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};
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struct noise_symmetric_key {
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u8 key[NOISE_SYMMETRIC_KEY_LEN];
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u64 birthdate;
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bool is_valid;
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};
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struct noise_keypair {
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struct index_hashtable_entry entry;
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struct noise_symmetric_key sending;
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atomic64_t sending_counter;
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struct noise_symmetric_key receiving;
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struct noise_replay_counter receiving_counter;
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__le32 remote_index;
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bool i_am_the_initiator;
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struct kref refcount;
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struct rcu_head rcu;
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u64 internal_id;
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};
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struct noise_keypairs {
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struct noise_keypair __rcu *current_keypair;
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struct noise_keypair __rcu *previous_keypair;
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struct noise_keypair __rcu *next_keypair;
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spinlock_t keypair_update_lock;
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};
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struct noise_static_identity {
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u8 static_public[NOISE_PUBLIC_KEY_LEN];
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u8 static_private[NOISE_PUBLIC_KEY_LEN];
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struct rw_semaphore lock;
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bool has_identity;
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};
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enum noise_handshake_state {
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HANDSHAKE_ZEROED,
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HANDSHAKE_CREATED_INITIATION,
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HANDSHAKE_CONSUMED_INITIATION,
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HANDSHAKE_CREATED_RESPONSE,
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HANDSHAKE_CONSUMED_RESPONSE
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};
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struct noise_handshake {
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struct index_hashtable_entry entry;
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enum noise_handshake_state state;
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u64 last_initiation_consumption;
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struct noise_static_identity *static_identity;
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u8 ephemeral_private[NOISE_PUBLIC_KEY_LEN];
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u8 remote_static[NOISE_PUBLIC_KEY_LEN];
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u8 remote_ephemeral[NOISE_PUBLIC_KEY_LEN];
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u8 precomputed_static_static[NOISE_PUBLIC_KEY_LEN];
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u8 preshared_key[NOISE_SYMMETRIC_KEY_LEN];
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u8 hash[NOISE_HASH_LEN];
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u8 chaining_key[NOISE_HASH_LEN];
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u8 latest_timestamp[NOISE_TIMESTAMP_LEN];
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__le32 remote_index;
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/* Protects all members except the immutable (after noise_handshake_
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* init): remote_static, precomputed_static_static, static_identity.
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*/
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struct rw_semaphore lock;
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};
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struct wg_device;
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void wg_noise_init(void);
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void wg_noise_handshake_init(struct noise_handshake *handshake,
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struct noise_static_identity *static_identity,
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const u8 peer_public_key[NOISE_PUBLIC_KEY_LEN],
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const u8 peer_preshared_key[NOISE_SYMMETRIC_KEY_LEN],
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struct wg_peer *peer);
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void wg_noise_handshake_clear(struct noise_handshake *handshake);
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static inline void wg_noise_reset_last_sent_handshake(atomic64_t *handshake_ns)
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{
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atomic64_set(handshake_ns, ktime_get_coarse_boottime_ns() -
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(u64)(REKEY_TIMEOUT + 1) * NSEC_PER_SEC);
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}
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void wg_noise_keypair_put(struct noise_keypair *keypair, bool unreference_now);
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struct noise_keypair *wg_noise_keypair_get(struct noise_keypair *keypair);
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void wg_noise_keypairs_clear(struct noise_keypairs *keypairs);
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bool wg_noise_received_with_keypair(struct noise_keypairs *keypairs,
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struct noise_keypair *received_keypair);
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void wg_noise_expire_current_peer_keypairs(struct wg_peer *peer);
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void wg_noise_set_static_identity_private_key(
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struct noise_static_identity *static_identity,
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const u8 private_key[NOISE_PUBLIC_KEY_LEN]);
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void wg_noise_precompute_static_static(struct wg_peer *peer);
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bool
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wg_noise_handshake_create_initiation(struct message_handshake_initiation *dst,
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struct noise_handshake *handshake);
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struct wg_peer *
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wg_noise_handshake_consume_initiation(struct message_handshake_initiation *src,
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struct wg_device *wg);
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bool wg_noise_handshake_create_response(struct message_handshake_response *dst,
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struct noise_handshake *handshake);
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struct wg_peer *
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wg_noise_handshake_consume_response(struct message_handshake_response *src,
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struct wg_device *wg);
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bool wg_noise_handshake_begin_session(struct noise_handshake *handshake,
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struct noise_keypairs *keypairs);
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#endif /* _WG_NOISE_H */
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