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import random
import sys
import string
from hashlib import sha256
import socketserver
from Crypto.Cipher import AES
import os
import hashlib
import time
secret = os.urandom(16)
admin_key = os.urandom(16).hex()
aes_key = os.urandom(16)
iv = os.urandom(AES.block_size)
wel = b'Welcome, somebody\nyou can:\n1. login\n2. registe\n'
class process(socketserver.BaseRequestHandler):
def justWaite(self):
time.sleep(3)
def _pad(self, s):
s = bytes(s, 'utf-8')
return s + (16 - len(s) % 16) * bytes((16 - len(s) % 16, ))
def _unpad(self, s):
return s[0:-s[-1]].decode('utf-8', 'ignore')
def mac(self, msg):
hmac = sha256(secret + msg).digest()
return (msg + hmac).hex()
def verifyMac(self, mac):
mac = bytes.fromhex(mac)
hmac = mac[-32:]
msg = mac[:-32]
if hmac == sha256(secret + msg).digest():
flag = True
else:
flag = False
return msg, flag
def encrypt(self, plain):
plain = self._pad(plain)
cipher = AES.new(aes_key, AES.MODE_CBC, iv)
ciphertext = iv + cipher.encrypt(plain)
return ciphertext
def decrypt(self, ciphertext):
cipher = AES.new(aes_key, AES.MODE_CBC, iv)
plain = cipher.decrypt(ciphertext[AES.block_size:])
return self._unpad(plain)
def adminLogin(self, username):
self.request.send(b'1. pic1\n2. pic2\n3. flag\n')
c = self.request.recv(2).decode('utf-8')[0]
if c == '1':
self.request.send(bytes('your gun:\n▄︻┻═┳一\n', 'UTF-8'))
elif c == '2':
self.request.send(bytes('your Tu Long Knife:\n━╋▇▇▇◤\n', 'UTF-8'))
elif c == '3':
with open('flag') as f:
flag = f.readline()
self.request.send(flag.encode('utf-8') + b'\n')
else:
self.request.send(b'wrong num')
def userLogin(self, username):
self.request.send(b'1. pic1\n2. pic2\n')
c = self.request.recv(2).decode('utf-8')[0]
if c == '1':
self.request.send(bytes('your gun:\n▄︻┻═┳一', 'UTF-8'))
elif c == '2':
self.request.send(bytes('your Tu Long Knife:\n━╋▇▇▇◤', 'UTF-8'))
else:
self.request.send(b'wrong num')
def handle(self):
while True:
self.isAdmin = False
self.request.send(wel)
wel_choice = self.request.recv(2).decode('utf-8')[0]
if wel_choice == '1':
self.request.send(b'input your cookie:>>')
cookie = self.request.recv(513).decode('utf-8')[:-1]
msg, flag = self.verifyMac(cookie)
msg = self.decrypt(msg)
print(msg)
print(len(msg))
try:
for i in range(len(msg) - 3):
if msg[i:i + 3] == 'un=':
username = msg[i + 3:]
username = username.split(';')[0]
print(username)
for i in range(len(msg) - 3):
if msg[i:i + 3] == 'pw=':
passwd = msg[i + 3:]
passwd = passwd.split(';')[0]
print(passwd)
for i in range(len(msg) - 8):
if msg[i:i + 8] == 'isAdmin=':
if msg[i + 8:i + 13] == 'True;':
self.isAdmin = True
except Exception as e:
print('error detected\n')
print(e)
if flag == False:
self.request.send(b'dear %s, your cookie is broken\n' % (
username.encode('utf-8')))
break
self.request.send(b'input your password:>>')
pw_t = self.request.recv(37).decode('utf-8')[:-1]
if pw_t != passwd:
self.request.send(b'wrong passwd!')
break
self.request.send(b'welcome! %s\n' %
(username.encode('utf-8')))
if self.isAdmin:
self.adminLogin(username)
else:
self.userLogin(username)
elif wel_choice == '2':
self.request.send(b'welcome! are you an admin?(Y/N)\n')
reg_c = self.request.recv(2).decode('utf-8')[0]
if reg_c == 'Y':
self.request.send(b'input admin key:>>')
u_key = self.request.recv(33).decode('utf-8')[:-1]
if u_key != admin_key:
break
else:
self.isAdmin = True
self.request.send(b'input your name:>>\n')
username = self.request.recv(37).decode('utf-8')[:-1]
if 'admin' in username.lower():
self.request.send(b'no admin in username\n')
continue
self.request.send(b'input your pw:>>\n')
passwd = self.request.recv(37).decode('utf-8')[:-1]
if 'admin' in passwd.lower():
self.request.send(b'no admin in password\n')
continue
cookie = self.mac(self.encrypt(
'isAdmin=' + str(self.isAdmin) + ';pw=' + passwd + ';un=' + username))
self.request.send(b'your cookie:>>\n' +
cookie.encode('utf-8') + b'\n')
else:
break
self.request.close()
class ThreadedServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
pass
if __name__ == "__main__":
HOST, PORT = '0.0.0.0', 10086
server = ThreadedServer((HOST, PORT), process)
server.allow_reuse_address = True
server.serve_forever()
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