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11a7686aa9
We precompute the static-static ECDH during configuration time, in order to save an expensive computation later when receiving network packets. However, not all ECDH computations yield a contributory result. Prior, we were just not letting those peers be added to the interface. However, this creates a strange inconsistency, since it was still possible to add other weird points, like a valid public key plus a low-order point, and, like points that result in zeros, a handshake would not complete. In order to make the behavior more uniform and less surprising, simply allow all peers to be added. Then, we'll error out later when doing the crypto if there's an issue. This also adds more separation between the crypto layer and the configuration layer. Discussed-with: Mathias Hall-Andersen <mathias@hall-andersen.dk> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: David S. Miller <davem@davemloft.net>
138 lines
3.9 KiB
C
138 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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union noise_counter {
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struct {
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u64 counter;
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unsigned long backtrack[COUNTER_BITS_TOTAL / BITS_PER_LONG];
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spinlock_t lock;
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} receive;
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atomic64_t counter;
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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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union noise_counter counter;
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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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struct noise_symmetric_key receiving;
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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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