#!/usr/bin/env python3 """ Wg tests """ import datetime import base64 from hashlib import blake2s from scapy.packet import Packet from scapy.packet import Raw from scapy.layers.l2 import Ether, ARP from scapy.layers.inet import IP, UDP from scapy.contrib.wireguard import Wireguard, WireguardResponse, \ WireguardInitiation, WireguardTransport from cryptography.hazmat.primitives.asymmetric.x25519 import \ X25519PrivateKey, X25519PublicKey from cryptography.hazmat.primitives.serialization import Encoding, \ PrivateFormat, PublicFormat, NoEncryption from cryptography.hazmat.primitives.hashes import BLAKE2s, Hash from cryptography.hazmat.primitives.hmac import HMAC from cryptography.hazmat.backends import default_backend from noise.connection import NoiseConnection, Keypair from vpp_ipip_tun_interface import VppIpIpTunInterface from vpp_interface import VppInterface from vpp_object import VppObject from framework import VppTestCase from re import compile import unittest """ TestWg is a subclass of VPPTestCase classes. Wg test. """ def private_key_bytes(k): return k.private_bytes(Encoding.Raw, PrivateFormat.Raw, NoEncryption()) def public_key_bytes(k): return k.public_bytes(Encoding.Raw, PublicFormat.Raw) class VppWgInterface(VppInterface): """ VPP WireGuard interface """ def __init__(self, test, src, port): super(VppWgInterface, self).__init__(test) self.port = port self.src = src self.private_key = X25519PrivateKey.generate() self.public_key = self.private_key.public_key() def public_key_bytes(self): return public_key_bytes(self.public_key) def private_key_bytes(self): return private_key_bytes(self.private_key) def add_vpp_config(self): r = self.test.vapi.wireguard_interface_create(interface={ 'user_instance': 0xffffffff, 'port': self.port, 'src_ip': self.src, 'private_key': private_key_bytes(self.private_key), 'generate_key': False }) self.set_sw_if_index(r.sw_if_index) self.test.registry.register(self, self.test.logger) return self def remove_vpp_config(self): self.test.vapi.wireguard_interface_delete( sw_if_index=self._sw_if_index) def query_vpp_config(self): ts = self.test.vapi.wireguard_interface_dump(sw_if_index=0xffffffff) for t in ts: if t.interface.sw_if_index == self._sw_if_index and \ str(t.interface.src_ip) == self.src and \ t.interface.port == self.port and \ t.interface.private_key == private_key_bytes(self.private_key): return True return False def __str__(self): return self.object_id() def object_id(self): return "wireguard-%d" % self._sw_if_index def find_route(test, prefix, table_id=0): routes = test.vapi.ip_route_dump(table_id, False) for e in routes: if table_id == e.route.table_id \ and str(e.route.prefix) == str(prefix): return True return False NOISE_HANDSHAKE_NAME = b"Noise_IKpsk2_25519_ChaChaPoly_BLAKE2s" NOISE_IDENTIFIER_NAME = b"WireGuard v1 zx2c4 Jason@zx2c4.com" class VppWgPeer(VppObject): def __init__(self, test, itf, endpoint, port, allowed_ips, persistent_keepalive=15): self._test = test self.itf = itf self.endpoint = endpoint self.port = port self.allowed_ips = allowed_ips self.persistent_keepalive = persistent_keepalive # remote peer's public self.private_key = X25519PrivateKey.generate() self.public_key = self.private_key.public_key() self.noise = NoiseConnection.from_name(NOISE_HANDSHAKE_NAME) def validate_routing(self): for a in self.allowed_ips: self._test.assertTrue(find_route(self._test, a)) def validate_no_routing(self): for a in self.allowed_ips: self._test.assertFalse(find_route(self._test, a)) def add_vpp_config(self): rv = self._test.vapi.wireguard_peer_add( peer={ 'public_key': self.public_key_bytes(), 'port': self.port, 'endpoint': self.endpoint, 'n_allowed_ips': len(self.allowed_ips), 'allowed_ips': self.allowed_ips, 'sw_if_index': self.itf.sw_if_index, 'persistent_keepalive': self.persistent_keepalive}) self.index = rv.peer_index self.receiver_index = self.index + 1 self._test.registry.register(self, self._test.logger) self.validate_routing() return self def remove_vpp_config(self): self._test.vapi.wireguard_peer_remove(peer_index=self.index) self.validate_no_routing() def object_id(self): return ("wireguard-peer-%s" % self.index) def public_key_bytes(self): return public_key_bytes(self.public_key) def query_vpp_config(self): peers = self._test.vapi.wireguard_peers_dump() for p in peers: if p.peer.public_key == self.public_key_bytes() and \ p.peer.port == self.port and \ str(p.peer.endpoint) == self.endpoint and \ p.peer.sw_if_index == self.itf.sw_if_index and \ len(self.allowed_ips) == p.peer.n_allowed_ips: self.allowed_ips.sort() p.peer.allowed_ips.sort() for (a1, a2) in zip(self.allowed_ips, p.peer.allowed_ips): if str(a1) != str(a2): return False return True return False def set_responder(self): self.noise.set_as_responder() def mk_tunnel_header(self, tx_itf): return (Ether(dst=tx_itf.local_mac, src=tx_itf.remote_mac) / IP(src=self.endpoint, dst=self.itf.src) / UDP(sport=self.port, dport=self.itf.port)) def noise_init(self, public_key=None): self.noise.set_prologue(NOISE_IDENTIFIER_NAME) self.noise.set_psks(psk=bytes(bytearray(32))) if not public_key: public_key = self.itf.public_key # local/this private self.noise.set_keypair_from_private_bytes( Keypair.STATIC, private_key_bytes(self.private_key)) # remote's public self.noise.set_keypair_from_public_bytes( Keypair.REMOTE_STATIC, public_key_bytes(public_key)) self.noise.start_handshake() def mk_handshake(self, tx_itf, public_key=None): self.noise.set_as_initiator() self.noise_init(public_key) p = (Wireguard() / WireguardInitiation()) p[Wireguard].message_type = 1 p[Wireguard].reserved_zero = 0 p[WireguardInitiation].sender_index = self.receiver_index # some random data for the message # lifted from the noise protocol's wireguard example now = datetime.datetime.now() tai = struct.pack('!qi', 4611686018427387914 + int(now.timestamp()), int(now.microsecond * 1e3)) b = self.noise.write_message(payload=tai) # load noise into init message p[WireguardInitiation].unencrypted_ephemeral = b[0:32] p[WireguardInitiation].encrypted_static = b[32:80] p[WireguardInitiation].encrypted_timestamp = b[80:108] # generate the mac1 hash mac_key = blake2s(b'mac1----' + self.itf.public_key_bytes()).digest() p[WireguardInitiation].mac1 = blake2s(bytes(p)[0:116], digest_size=16, key=mac_key).digest() p[WireguardInitiation].mac2 = bytearray(16) p = (self.mk_tunnel_header(tx_itf) / p) return p def verify_header(self, p): self._test.assertEqual(p[IP].src, self.itf.src) self._test.assertEqual(p[IP].dst, self.endpoint) self._test.assertEqual(p[UDP].sport, self.itf.port) self._test.assertEqual(p[UDP].dport, self.port) self._test.assert_packet_checksums_valid(p) def consume_init(self, p, tx_itf): self.noise.set_as_responder() self.noise_init(self.itf.public_key) self.verify_header(p) init = Wireguard(p[Raw]) self._test.assertEqual(init[Wireguard].message_type, 1) self._test.assertEqual(init[Wireguard].reserved_zero, 0) self.sender = init[WireguardInitiation].sender_index # validate the 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) # this passes only unencrypted_ephemeral, encrypted_static, # encrypted_timestamp fields of the init payload = self.noise.read_message(bytes(init)[8:-32]) # build the response b = self.noise.write_message() mac_key = blake2s(b'mac1----' + public_key_bytes(self.itf.public_key)).digest() resp = (Wireguard(message_type=2, reserved_zero=0) / WireguardResponse(sender_index=self.receiver_index, receiver_index=self.sender, unencrypted_ephemeral=b[0:32], encrypted_nothing=b[32:])) mac1 = blake2s(bytes(resp)[:-32], digest_size=16, key=mac_key).digest() resp[WireguardResponse].mac1 = mac1 resp = (self.mk_tunnel_header(tx_itf) / resp) self._test.assertTrue(self.noise.handshake_finished) return resp def consume_response(self, p): self.verify_header(p) resp = Wireguard(p[Raw]) self._test.assertEqual(resp[Wireguard].message_type, 2) self._test.assertEqual(resp[Wireguard].reserved_zero, 0) self._test.assertEqual(resp[WireguardResponse].receiver_index, self.receiver_index) self.sender = resp[Wireguard].sender_index payload = self.noise.read_message(bytes(resp)[12:60]) self._test.assertEqual(payload, b'') self._test.assertTrue(self.noise.handshake_finished) def decrypt_transport(self, p): self.verify_header(p) p = Wireguard(p[Raw]) self._test.assertEqual(p[Wireguard].message_type, 4) self._test.assertEqual(p[Wireguard].reserved_zero, 0) self._test.assertEqual(p[WireguardTransport].receiver_index, self.receiver_index) d = self.noise.decrypt( p[WireguardTransport].encrypted_encapsulated_packet) return d def encrypt_transport(self, p): return self.noise.encrypt(bytes(p)) class TestWg(VppTestCase): """ Wireguard Test Case """ error_str = compile(r"Error") @classmethod def setUpClass(cls): super(TestWg, cls).setUpClass() try: cls.create_pg_interfaces(range(3)) for i in cls.pg_interfaces: i.admin_up() i.config_ip4() i.resolve_arp() except Exception: super(TestWg, cls).tearDownClass() raise @classmethod def tearDownClass(cls): super(TestWg, cls).tearDownClass() def test_wg_interface(self): """ Simple interface creation """ port = 12312 # Create interface wg0 = VppWgInterface(self, self.pg1.local_ip4, port).add_vpp_config() self.logger.info(self.vapi.cli("sh int")) # delete interface wg0.remove_vpp_config() def test_handshake_hash(self): """ test hashing an init message """ # a init packet generated by linux given the key below h = "0100000098b9032b" \ "55cc4b39e73c3d24" \ "a2a1ab884b524a81" \ "1808bb86640fb70d" \ "e93154fec1879125" \ "ab012624a27f0b75" \ "c0a2582f438ddb5f" \ "8e768af40b4ab444" \ "02f9ff473e1b797e" \ "80d39d93c5480c82" \ "a3d4510f70396976" \ "586fb67300a5167b" \ "ae6ca3ff3dfd00eb" \ "59be198810f5aa03" \ "6abc243d2155ee4f" \ "2336483900aef801" \ "08752cd700000000" \ "0000000000000000" \ "00000000" b = bytearray.fromhex(h) tgt = Wireguard(b) pubb = base64.b64decode("aRuHFTTxICIQNefp05oKWlJv3zgKxb8+WW7JJMh0jyM=") pub = X25519PublicKey.from_public_bytes(pubb) self.assertEqual(pubb, public_key_bytes(pub)) # strip the macs and build a new packet init = b[0:-32] mac_key = blake2s(b'mac1----' + public_key_bytes(pub)).digest() init += blake2s(init, digest_size=16, key=mac_key).digest() init += b'\x00' * 16 act = Wireguard(init) self.assertEqual(tgt, act) def test_wg_peer_resp(self): """ Send handshake response """ wg_output_node_name = '/err/wg-output-tun/' wg_input_node_name = '/err/wg-input/' port = 12323 # Create interfaces 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() peer_1 = VppWgPeer(self, wg0, self.pg1.remote_ip4, port+1, ["10.11.2.0/24", "10.11.3.0/24"]).add_vpp_config() self.assertEqual(len(self.vapi.wireguard_peers_dump()), 1) # wait for the peer to send a handshake rx = self.pg1.get_capture(1, timeout=2) # consume the handshake in the noise protocol and # generate the response resp = peer_1.consume_init(rx[0], self.pg1) # send the response, get keepalive rxs = self.send_and_expect(self.pg1, [resp], self.pg1) for rx in rxs: b = peer_1.decrypt_transport(rx) self.assertEqual(0, len(b)) # send a packets that are routed into the tunnel p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / IP(src=self.pg0.remote_ip4, dst="10.11.3.2") / UDP(sport=555, dport=556) / Raw(b'\x00' * 80)) rxs = self.send_and_expect(self.pg0, p * 255, self.pg1) for rx in rxs: rx = IP(peer_1.decrypt_transport(rx)) # chech the oringial packet is present self.assertEqual(rx[IP].dst, p[IP].dst) self.assertEqual(rx[IP].ttl, p[IP].ttl-1) # send packets into the tunnel, expect to receive them on # the other side p = [(peer_1.mk_tunnel_header(self.pg1) / Wireguard(message_type=4, reserved_zero=0) / WireguardTransport( receiver_index=peer_1.sender, counter=ii, encrypted_encapsulated_packet=peer_1.encrypt_transport( (IP(src="10.11.3.1", dst=self.pg0.remote_ip4, ttl=20) / UDP(sport=222, dport=223) / Raw())))) for ii in range(255)] rxs = self.send_and_expect(self.pg1, p, self.pg0) for rx in rxs: self.assertEqual(rx[IP].dst, self.pg0.remote_ip4) self.assertEqual(rx[IP].ttl, 19) def test_wg_peer_init(self): """ Send handshake init """ wg_output_node_name = '/err/wg-output-tun/' wg_input_node_name = '/err/wg-input/' port = 12323 # Create interfaces wg0 = VppWgInterface(self, self.pg1.local_ip4, port).add_vpp_config() wg0.admin_up() wg0.config_ip4() peer_1 = VppWgPeer(self, wg0, self.pg1.remote_ip4, port+1, ["10.11.2.0/24", "10.11.3.0/24"]).add_vpp_config() self.assertEqual(len(self.vapi.wireguard_peers_dump()), 1) # route a packet into the wg interface # use the allowed-ip prefix # this is dropped because the peer is not initiated p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / IP(src=self.pg0.remote_ip4, dst="10.11.3.2") / UDP(sport=555, dport=556) / Raw()) self.send_and_assert_no_replies(self.pg0, [p]) kp_error = wg_output_node_name + "Keypair error" self.assertEqual(1, self.statistics.get_err_counter(kp_error)) # send a handsake from the peer with an invalid MAC p = peer_1.mk_handshake(self.pg1) p[WireguardInitiation].mac1 = b'foobar' self.send_and_assert_no_replies(self.pg1, [p]) self.assertEqual(1, self.statistics.get_err_counter( wg_input_node_name + "Invalid MAC handshake")) # send a handsake from the peer but signed by the wrong key. p = peer_1.mk_handshake(self.pg1, X25519PrivateKey.generate().public_key()) self.send_and_assert_no_replies(self.pg1, [p]) self.assertEqual(1, self.statistics.get_err_counter( wg_input_node_name + "Peer error")) # send a valid handsake init for which we expect a response p = peer_1.mk_handshake(self.pg1) rx = self.send_and_expect(self.pg1, [p], self.pg1) peer_1.consume_response(rx[0]) # route a packet into the wg interface # this is dropped because the peer is still not initiated p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / IP(src=self.pg0.remote_ip4, dst="10.11.3.2") / UDP(sport=555, dport=556) / Raw()) self.send_and_assert_no_replies(self.pg0, [p]) self.assertEqual(2, self.statistics.get_err_counter(kp_error)) # send a data packet from the peer through the tunnel # this completes the handshake p = (IP(src="10.11.3.1", dst=self.pg0.remote_ip4, ttl=20) / UDP(sport=222, dport=223) / Raw()) d = peer_1.encrypt_transport(p) p = (peer_1.mk_tunnel_header(self.pg1) / (Wireguard(message_type=4, reserved_zero=0) / WireguardTransport(receiver_index=peer_1.sender, counter=0, encrypted_encapsulated_packet=d))) rxs = self.send_and_expect(self.pg1, [p], self.pg0) for rx in rxs: self.assertEqual(rx[IP].dst, self.pg0.remote_ip4) self.assertEqual(rx[IP].ttl, 19) # send a packets that are routed into the tunnel p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / IP(src=self.pg0.remote_ip4, dst="10.11.3.2") / UDP(sport=555, dport=556) / Raw(b'\x00' * 80)) rxs = self.send_and_expect(self.pg0, p * 255, self.pg1) for rx in rxs: rx = IP(peer_1.decrypt_transport(rx)) # chech the oringial packet is present self.assertEqual(rx[IP].dst, p[IP].dst) self.assertEqual(rx[IP].ttl, p[IP].ttl-1) # send packets into the tunnel, expect to receive them on # the other side p = [(peer_1.mk_tunnel_header(self.pg1) / Wireguard(message_type=4, reserved_zero=0) / WireguardTransport( receiver_index=peer_1.sender, counter=ii+1, encrypted_encapsulated_packet=peer_1.encrypt_transport( (IP(src="10.11.3.1", dst=self.pg0.remote_ip4, ttl=20) / UDP(sport=222, dport=223) / Raw())))) for ii in range(255)] rxs = self.send_and_expect(self.pg1, p, self.pg0) for rx in rxs: self.assertEqual(rx[IP].dst, self.pg0.remote_ip4) self.assertEqual(rx[IP].ttl, 19) peer_1.remove_vpp_config() wg0.remove_vpp_config() def test_wg_multi_peer(self): """ multiple peer setup """ port = 12323 # Create interfaces wg0 = VppWgInterface(self, self.pg1.local_ip4, port).add_vpp_config() wg1 = VppWgInterface(self, self.pg2.local_ip4, port+1).add_vpp_config() wg0.admin_up() wg1.admin_up() # Check peer counter self.assertEqual(len(self.vapi.wireguard_peers_dump()), 0) self.pg_enable_capture(self.pg_interfaces) self.pg_start() # Create many peers on sencond interface NUM_PEERS = 16 self.pg2.generate_remote_hosts(NUM_PEERS) self.pg2.configure_ipv4_neighbors() self.pg1.generate_remote_hosts(NUM_PEERS) self.pg1.configure_ipv4_neighbors() peers_1 = [] peers_2 = [] for i in range(NUM_PEERS): peers_1.append(VppWgPeer(self, wg0, self.pg1.remote_hosts[i].ip4, port+1+i, ["10.0.%d.4/32" % i]).add_vpp_config()) peers_2.append(VppWgPeer(self, wg1, self.pg2.remote_hosts[i].ip4, port+100+i, ["10.100.%d.4/32" % i]).add_vpp_config()) self.assertEqual(len(self.vapi.wireguard_peers_dump()), NUM_PEERS*2) self.logger.info(self.vapi.cli("show wireguard peer")) self.logger.info(self.vapi.cli("show wireguard interface")) self.logger.info(self.vapi.cli("show adj 37")) self.logger.info(self.vapi.cli("sh ip fib 172.16.3.17")) self.logger.info(self.vapi.cli("sh ip fib 10.11.3.0")) # remove peers for p in peers_1: self.assertTrue(p.query_vpp_config()) p.remove_vpp_config() for p in peers_2: self.assertTrue(p.query_vpp_config()) p.remove_vpp_config() wg0.remove_vpp_config() wg1.remove_vpp_config()