95 lines
3 KiB
Python
Executable file
95 lines
3 KiB
Python
Executable file
#!/usr/bin/python3
|
|
|
|
# SPDX-License-Identifier: MIT
|
|
# Author: Piotr Lizonczyk <plizonczyk.public@gmail.com>
|
|
|
|
import base64
|
|
import datetime
|
|
from hashlib import blake2s
|
|
import socket
|
|
import struct
|
|
|
|
from scapy.layers.inet import IP, ICMP
|
|
|
|
from noise.connection import NoiseConnection, Keypair
|
|
|
|
|
|
address = ('demo.wireguard.com', 12913)
|
|
|
|
our_private = base64.b64decode('WAmgVYXkbT2bCtdcDwolI88/iVi/aV3/PHcUBTQSYmo=')
|
|
their_public = base64.b64decode('qRCwZSKInrMAq5sepfCdaCsRJaoLe5jhtzfiw7CjbwM=')
|
|
preshared = base64.b64decode('FpCyhws9cxwWoV4xELtfJvjJN+zQVRPISllRWgeopVE=')
|
|
prologue = b'WireGuard v1 zx2c4 Jason@zx2c4.com'
|
|
|
|
noise = NoiseConnection.from_name(b'Noise_IKpsk2_25519_ChaChaPoly_BLAKE2s')
|
|
noise.set_as_initiator()
|
|
noise.set_keypair_from_private_bytes(Keypair.STATIC, our_private)
|
|
noise.set_keypair_from_public_bytes(Keypair.REMOTE_STATIC, their_public)
|
|
noise.set_psks(psk=preshared)
|
|
noise.set_prologue(prologue)
|
|
noise.start_handshake()
|
|
|
|
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
|
|
|
|
|
|
# 1. Prepare and send handshake initiation packet
|
|
now = datetime.datetime.now()
|
|
tai = struct.pack('!qi', 4611686018427387914 + int(now.timestamp()), int(now.microsecond * 1e3))
|
|
initiation_packet = b'\x01' # Type: initiation
|
|
initiation_packet += b'\x00' * 3 # Reserved
|
|
initiation_packet += struct.pack('<i', 28) # Sender index: 28 (arbitrary)
|
|
initiation_packet += noise.write_message(payload=tai)
|
|
mac_key = blake2s(b'mac1----' + their_public).digest()
|
|
initiation_packet += blake2s(initiation_packet, digest_size=16, key=mac_key).digest()
|
|
initiation_packet += b'\x00' * 16
|
|
|
|
sock.sendto(initiation_packet, address)
|
|
|
|
|
|
# 2. Receive response to finalize handshake
|
|
response_packet = sock.recv(92)
|
|
assert response_packet[0] == 2 # Type: response
|
|
assert response_packet[1:4] == b'\x00' * 3 # Reserved
|
|
their_index, our_index = struct.unpack('<ii', response_packet[4:12])
|
|
assert our_index == 28
|
|
payload = noise.read_message(response_packet[12:60])
|
|
assert payload == b''
|
|
assert noise.handshake_finished
|
|
|
|
|
|
# 3. Prepare, encrypt and send ping packet
|
|
icmp_packet = ICMP(type=8, id=921, seq=438)/b'WireGuard'
|
|
ip_packet = IP(proto=1, ttl=20, src="10.189.129.2", dst="10.189.129.1", id=0)/icmp_packet
|
|
ping_packet = b'\x04' # Type: data
|
|
ping_packet += b'\x00' * 3 # Reserved
|
|
ping_packet += struct.pack('<iq', their_index, 0)
|
|
ping_packet += noise.encrypt(bytes(ip_packet))
|
|
|
|
sock.sendto(ping_packet, address)
|
|
|
|
|
|
# 4. Retrieve ping response, decrypt and verify
|
|
encrypted_response = sock.recv(80)
|
|
assert encrypted_response[0] == 4 # Type: data
|
|
assert encrypted_response[1:4] == b'\x00' * 3 # Reserved
|
|
our_index, nonce = struct.unpack('<iq', encrypted_response[4:16])
|
|
assert our_index == 28
|
|
assert nonce == 0
|
|
ip = IP(noise.decrypt(encrypted_response[16:]))
|
|
icmp = ip[1]
|
|
payload = ip[2]
|
|
assert icmp.type == 0
|
|
assert icmp.code == 0
|
|
assert icmp.id == 921
|
|
assert icmp.seq == 438
|
|
assert payload.load == b'WireGuard'
|
|
|
|
|
|
# 5. Send keepalive
|
|
keepalive = b'\x04' # Type: data
|
|
keepalive += b'\x00' * 3 # Reserved
|
|
keepalive += struct.pack('<iq', their_index, 1)
|
|
keepalive += noise.encrypt(b'')
|
|
|
|
sock.sendto(keepalive, address)
|