WireguardResponse,
WireguardInitiation,
WireguardTransport,
+ WireguardCookieReply,
)
from cryptography.hazmat.primitives.asymmetric.x25519 import (
X25519PrivateKey,
from cryptography.hazmat.backends import default_backend
from noise.connection import NoiseConnection, Keypair
+from Crypto.Cipher import ChaCha20_Poly1305
+from Crypto.Random import get_random_bytes
+
from vpp_ipip_tun_interface import VppIpIpTunInterface
from vpp_interface import VppInterface
from vpp_ip_route import VppIpRoute, VppRoutePath
return k.public_bytes(Encoding.Raw, PublicFormat.Raw)
+def get_field_bytes(pkt, name):
+ fld, val = pkt.getfield_and_val(name)
+ return fld.i2m(pkt, val)
+
+
class VppWgInterface(VppInterface):
"""
VPP WireGuard interface
self.private_key = X25519PrivateKey.generate()
self.public_key = self.private_key.public_key()
+ # cookie related params
+ self.cookie_key = blake2s(b"cookie--" + self.public_key_bytes()).digest()
+ self.last_sent_cookie = None
+
self.noise = NoiseConnection.from_name(NOISE_HANDSHAKE_NAME)
def add_vpp_config(self, is_ip6=False):
return True
return False
- def set_responder(self):
- self.noise.set_as_responder()
-
def mk_tunnel_header(self, tx_itf, is_ip6=False):
if is_ip6 is False:
return (
self.noise.start_handshake()
+ def mk_cookie(self, p, tx_itf, is_resp=False, is_ip6=False):
+ self.verify_header(p, is_ip6)
+
+ wg_pkt = Wireguard(p[Raw])
+
+ if is_resp:
+ self._test.assertEqual(wg_pkt[Wireguard].message_type, 2)
+ self._test.assertEqual(wg_pkt[Wireguard].reserved_zero, 0)
+ self._test.assertEqual(wg_pkt[WireguardResponse].mac2, bytes([0] * 16))
+ else:
+ self._test.assertEqual(wg_pkt[Wireguard].message_type, 1)
+ self._test.assertEqual(wg_pkt[Wireguard].reserved_zero, 0)
+ self._test.assertEqual(wg_pkt[WireguardInitiation].mac2, bytes([0] * 16))
+
+ # collect info from wg packet (initiation or response)
+ src = get_field_bytes(p[IPv6 if is_ip6 else IP], "src")
+ sport = p[UDP].sport.to_bytes(2, byteorder="big")
+ if is_resp:
+ mac1 = wg_pkt[WireguardResponse].mac1
+ sender_index = wg_pkt[WireguardResponse].sender_index
+ else:
+ mac1 = wg_pkt[WireguardInitiation].mac1
+ sender_index = wg_pkt[WireguardInitiation].sender_index
+
+ # make cookie reply
+ cookie_reply = Wireguard() / WireguardCookieReply()
+ cookie_reply[Wireguard].message_type = 3
+ cookie_reply[Wireguard].reserved_zero = 0
+ cookie_reply[WireguardCookieReply].receiver_index = sender_index
+ nonce = get_random_bytes(24)
+ cookie_reply[WireguardCookieReply].nonce = nonce
+
+ # generate cookie data
+ changing_secret = get_random_bytes(32)
+ self.last_sent_cookie = blake2s(
+ src + sport, digest_size=16, key=changing_secret
+ ).digest()
+
+ # encrypt cookie data
+ cipher = ChaCha20_Poly1305.new(key=self.cookie_key, nonce=nonce)
+ cipher.update(mac1)
+ ciphertext, tag = cipher.encrypt_and_digest(self.last_sent_cookie)
+ cookie_reply[WireguardCookieReply].encrypted_cookie = ciphertext + tag
+
+ # prepare cookie reply to be sent
+ cookie_reply = self.mk_tunnel_header(tx_itf, is_ip6) / cookie_reply
+
+ return cookie_reply
+
def mk_handshake(self, tx_itf, is_ip6=False, public_key=None):
self.noise.set_as_initiator()
self.noise_init(public_key)
self._test.assertEqual(p[UDP].dport, self.port)
self._test.assert_packet_checksums_valid(p)
- def consume_init(self, p, tx_itf, is_ip6=False):
+ def consume_init(self, p, tx_itf, is_ip6=False, is_mac2=False):
self.noise.set_as_responder()
self.noise_init(self.itf.public_key)
self.verify_header(p, is_ip6)
self.sender = init[WireguardInitiation].sender_index
- # validate the hash
+ # validate the mac1 hash
mac_key = blake2s(b"mac1----" + public_key_bytes(self.public_key)).digest()
mac1 = blake2s(bytes(init)[0:-32], digest_size=16, key=mac_key).digest()
self._test.assertEqual(init[WireguardInitiation].mac1, mac1)
+ # validate the mac2 hash
+ if is_mac2:
+ self._test.assertNotEqual(init[WireguardInitiation].mac2, bytes([0] * 16))
+ self._test.assertNotEqual(self.last_sent_cookie, None)
+ mac2 = blake2s(
+ bytes(init)[0:-16], digest_size=16, key=self.last_sent_cookie
+ ).digest()
+ self._test.assertEqual(init[WireguardInitiation].mac2, mac2)
+ self.last_sent_cookie = None
+ else:
+ self._test.assertEqual(init[WireguardInitiation].mac2, bytes([0] * 16))
+
# this passes only unencrypted_ephemeral, encrypted_static,
# encrypted_timestamp fields of the init
payload = self.noise.read_message(bytes(init)[8:-32])
mac6_error = wg6_input_node_name + "Invalid MAC handshake"
peer6_in_err = wg6_input_node_name + "Peer error"
peer6_out_err = wg6_output_node_name + "Peer error"
+ cookie_dec4_err = wg4_input_node_name + "Failed during Cookie decryption"
+ cookie_dec6_err = wg6_input_node_name + "Failed during Cookie decryption"
@classmethod
def setUpClass(cls):
self.base_mac6_err = self.statistics.get_err_counter(self.mac6_error)
self.base_peer6_in_err = self.statistics.get_err_counter(self.peer6_in_err)
self.base_peer6_out_err = self.statistics.get_err_counter(self.peer6_out_err)
+ self.base_cookie_dec4_err = self.statistics.get_err_counter(
+ self.cookie_dec4_err
+ )
+ self.base_cookie_dec6_err = self.statistics.get_err_counter(
+ self.cookie_dec6_err
+ )
def test_wg_interface(self):
"""Simple interface creation"""
self.assertEqual(tgt, act)
+ def _test_wg_send_cookie_tmpl(self, is_resp, is_ip6):
+ port = 12323
+
+ # create wg interface
+ if is_ip6:
+ wg0 = VppWgInterface(self, self.pg1.local_ip6, port).add_vpp_config()
+ wg0.admin_up()
+ wg0.config_ip6()
+ else:
+ wg0 = VppWgInterface(self, self.pg1.local_ip4, port).add_vpp_config()
+ wg0.admin_up()
+ wg0.config_ip4()
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ # create a peer
+ if is_ip6:
+ peer_1 = VppWgPeer(
+ self, wg0, self.pg1.remote_ip6, port + 1, ["1::3:0/112"]
+ ).add_vpp_config()
+ else:
+ peer_1 = VppWgPeer(
+ self, wg0, self.pg1.remote_ip4, port + 1, ["10.11.3.0/24"]
+ ).add_vpp_config()
+ self.assertEqual(len(self.vapi.wireguard_peers_dump()), 1)
+
+ if is_resp:
+ # prepare and send a handshake initiation
+ # expect the peer to send a handshake response
+ init = peer_1.mk_handshake(self.pg1, is_ip6=is_ip6)
+ rxs = self.send_and_expect(self.pg1, [init], self.pg1)
+ else:
+ # wait for the peer to send a handshake initiation
+ rxs = self.pg1.get_capture(1, timeout=2)
+
+ # prepare and send a wrong cookie reply
+ # expect no replies and the cookie error incremented
+ cookie = peer_1.mk_cookie(rxs[0], self.pg1, is_resp=is_resp, is_ip6=is_ip6)
+ cookie.nonce = b"1234567890"
+ self.send_and_assert_no_replies(self.pg1, [cookie], timeout=0.1)
+ if is_ip6:
+ self.assertEqual(
+ self.base_cookie_dec6_err + 1,
+ self.statistics.get_err_counter(self.cookie_dec6_err),
+ )
+ else:
+ self.assertEqual(
+ self.base_cookie_dec4_err + 1,
+ self.statistics.get_err_counter(self.cookie_dec4_err),
+ )
+
+ # prepare and send a correct cookie reply
+ cookie = peer_1.mk_cookie(rxs[0], self.pg1, is_resp=is_resp, is_ip6=is_ip6)
+ self.pg_send(self.pg1, [cookie])
+
+ # wait for the peer to send a handshake initiation with mac2 set
+ rxs = self.pg1.get_capture(1, timeout=6)
+
+ # verify the initiation and its mac2
+ peer_1.consume_init(rxs[0], self.pg1, is_ip6=is_ip6, is_mac2=True)
+
+ # remove configs
+ peer_1.remove_vpp_config()
+ wg0.remove_vpp_config()
+
+ def test_wg_send_cookie_on_init_v4(self):
+ """Send cookie on handshake initiation (v4)"""
+ self._test_wg_send_cookie_tmpl(is_resp=False, is_ip6=False)
+
+ def test_wg_send_cookie_on_init_v6(self):
+ """Send cookie on handshake initiation (v6)"""
+ self._test_wg_send_cookie_tmpl(is_resp=False, is_ip6=True)
+
+ def test_wg_send_cookie_on_resp_v4(self):
+ """Send cookie on handshake response (v4)"""
+ self._test_wg_send_cookie_tmpl(is_resp=True, is_ip6=False)
+
+ def test_wg_send_cookie_on_resp_v6(self):
+ """Send cookie on handshake response (v6)"""
+ self._test_wg_send_cookie_tmpl(is_resp=True, is_ip6=True)
+
def test_wg_peer_resp(self):
"""Send handshake response"""
port = 12323
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