diff options
| author |   Alexander Chernavin <achernavin@netgate.com> | 2022-07-20 12:43:42 +0000 |
|---|---|---|
| committer |   Fan Zhang <roy.fan.zhang@intel.com> | 2022-08-08 14:24:06 +0000 |
| commit | ce91af8ad27e5ddef1e1f8316129bfcaa3de9ef6 (patch) | |
| tree | 42fa54977a8b413e43d7b03f27ce8a256ad8f109 /src/plugins/wireguard/wireguard_chachapoly.c | |
| parent | 03aae9637922023dd77955cb15caafb7ce309200 (diff) | |
wireguard: add dos mitigation support
Type: feature
With this change:
- if the number of received handshake messages exceeds the limit
calculated based on the peers number, under load state will activate;
- if being under load a handshake message with a valid mac1 is
received, but mac2 is invalid, a cookie reply will be sent.
Also, cover these with tests.
Signed-off-by: Alexander Chernavin <achernavin@netgate.com>
Change-Id: I3003570a9cf807cfb0b5145b89a085455c30e717
Diffstat (limited to 'src/plugins/wireguard/wireguard_chachapoly.c')
| -rw-r--r-- | src/plugins/wireguard/wireguard_chachapoly.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/plugins/wireguard/wireguard_chachapoly.c b/src/plugins/wireguard/wireguard_chachapoly.c index 961b43f100d..0dd7908d2e2 100644 --- a/src/plugins/wireguard/wireguard_chachapoly.c +++ b/src/plugins/wireguard/wireguard_chachapoly.c @@ -61,6 +61,36 @@ wg_chacha20poly1305_calc (vlib_main_t *vm, u8 *src, u32 src_len, u8 *dst, return (op->status == VNET_CRYPTO_OP_STATUS_COMPLETED); } +void +wg_xchacha20poly1305_encrypt (vlib_main_t *vm, u8 *src, u32 src_len, u8 *dst, + u8 *aad, u32 aad_len, + u8 nonce[XCHACHA20POLY1305_NONCE_SIZE], + u8 key[CHACHA20POLY1305_KEY_SIZE]) +{ + int i; + u32 derived_key[CHACHA20POLY1305_KEY_SIZE / sizeof (u32)]; + u64 h_nonce; + + clib_memcpy (&h_nonce, nonce + 16, sizeof (h_nonce)); + h_nonce = le64toh (h_nonce); + hchacha20 (derived_key, nonce, key); + + for (i = 0; i < (sizeof (derived_key) / sizeof (derived_key[0])); i++) + (derived_key[i]) = htole32 ((derived_key[i])); + + uint32_t key_idx; + + key_idx = + vnet_crypto_key_add (vm, VNET_CRYPTO_ALG_CHACHA20_POLY1305, + (uint8_t *) derived_key, CHACHA20POLY1305_KEY_SIZE); + + wg_chacha20poly1305_calc (vm, src, src_len, dst, aad, aad_len, h_nonce, + VNET_CRYPTO_OP_CHACHA20_POLY1305_ENC, key_idx); + + vnet_crypto_key_del (vm, key_idx); + wg_secure_zero_memory (derived_key, CHACHA20POLY1305_KEY_SIZE); +} + bool wg_xchacha20poly1305_decrypt (vlib_main_t *vm, u8 *src, u32 src_len, u8 *dst, u8 *aad, u32 aad_len, |