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| 2 | |
| 3 | * Copyright (C) 2015-2019 Jason A. Donenfeld <[email protected]>. All Rights Reserved.
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| 4 |
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| 5 |
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| 6 | #ifndef _WG_COOKIE_H
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| 7 | #define _WG_COOKIE_H
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| 8 |
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| 9 | #include "messages.h"
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| 10 | #include <linux/rwsem.h>
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| 11 |
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| 12 | struct wg_peer;
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| 13 |
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| 14 | struct cookie_checker {
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| 15 | u8 secret[NOISE_HASH_LEN];
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| 16 | u8 cookie_encryption_key[NOISE_SYMMETRIC_KEY_LEN];
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| 17 | u8 message_mac1_key[NOISE_SYMMETRIC_KEY_LEN];
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| 18 | u64 secret_birthdate;
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| 19 | struct rw_semaphore secret_lock;
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| 20 | struct wg_device *device;
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| 21 | };
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| 22 |
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| 23 | struct cookie {
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| 24 | u64 birthdate;
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| 25 | bool is_valid;
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| 26 | u8 cookie[COOKIE_LEN];
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| 27 | bool have_sent_mac1;
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| 28 | u8 last_mac1_sent[COOKIE_LEN];
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| 29 | u8 cookie_decryption_key[NOISE_SYMMETRIC_KEY_LEN];
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| 30 | u8 message_mac1_key[NOISE_SYMMETRIC_KEY_LEN];
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| 31 | struct rw_semaphore lock;
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| 32 | };
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| 33 |
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| 34 | enum cookie_mac_state {
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| 35 | INVALID_MAC,
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| 36 | VALID_MAC_BUT_NO_COOKIE,
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| 37 | VALID_MAC_WITH_COOKIE_BUT_RATELIMITED,
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| 38 | VALID_MAC_WITH_COOKIE
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| 39 | };
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| 40 |
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| 41 | void wg_cookie_checker_init(struct cookie_checker *checker,
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| 42 | struct wg_device *wg);
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| 43 | void wg_cookie_checker_precompute_device_keys(struct cookie_checker *checker);
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| 44 | void wg_cookie_checker_precompute_peer_keys(struct wg_peer *peer);
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| 45 | void wg_cookie_init(struct cookie *cookie);
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| 46 |
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| 47 | enum cookie_mac_state wg_cookie_validate_packet(struct cookie_checker *checker,
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| 48 | struct sk_buff *skb,
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| 49 | bool check_cookie);
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| 50 | void wg_cookie_add_mac_to_packet(void *message, size_t len,
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| 51 | struct wg_peer *peer);
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| 52 |
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| 53 | void wg_cookie_message_create(struct message_handshake_cookie *src,
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| 54 | struct sk_buff *skb, __le32 index,
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| 55 | struct cookie_checker *checker);
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| 56 | void wg_cookie_message_consume(struct message_handshake_cookie *src,
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| 57 | struct wg_device *wg);
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| 58 |
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| 59 | #endif
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