78 lines
1.9 KiB
Python
78 lines
1.9 KiB
Python
import socket
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from common import *
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import socket
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from AES import AESCipher
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import os
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HOST = "127.0.0.1"
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PORT = TGS_PORT
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def process_message(message):
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print(message)
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message = message.split("||")
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if message[0] == "request":
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"""
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T_c_tgs = {ID_C + T_R + K_c_tgs}K_tgs
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M3 = [{ID_C + ID_S + T_R + N2}K_c_tgs + T_c_tgs]
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M4 = [{K_c_s + T_A + N2}K_c_tgs + T_c_s]
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T_c_s = {ID_C + T_A + K_c_s}K_s
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"""
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body = message[1].split(",")
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K_tgs = C_K_tgs
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M3 = body[0]
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M3 = M3.split(",")
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M3_inner = M3[0]
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T_c_tgs = body[1]
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print('T_c_tgs', type(T_c_tgs), T_c_tgs)
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M3_AES = AESCipher(K_tgs)
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T_c_tgs = M3_AES.decrypt(T_c_tgs)
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T_c_tgs = T_c_tgs.split(",")
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ID_C = T_c_tgs[0]
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T_R = int(T_c_tgs[1])
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K_c_tgs = eval(T_c_tgs[2])
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M3_inner_AES = AESCipher(K_c_tgs)
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M3_inner = M3_inner_AES.decrypt(M3_inner)
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M3_inner = M3_inner.split(",")
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ID_S = M3_inner[1]
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N2 = M3_inner[3]
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# generate M4
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K_c_s = os.urandom(16)
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T_A = 600 if T_R > 600 else T_R
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T_c_s = f"{ID_C},{T_A},{K_c_s}"
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K_s = C_K_s
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T_c_s_AES = AESCipher(K_s)
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T_c_s = T_c_s_AES.encrypt(T_c_s)
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M4_inner = f"{K_c_s},{T_A},{N2}"
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M4_inner_AES = AESCipher(K_c_tgs)
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M4_inner = M4_inner_AES.encrypt(M4_inner)
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M4 = f"{M4_inner},{T_c_s}"
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return M4
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def main():
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
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s.bind((HOST, PORT))
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s.listen()
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while True:
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conn, addr = s.accept()
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with conn:
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print(f"Connected by {addr}")
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all_data = ""
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data = conn.recv(4096)
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all_data += data.decode()
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response = process_message(all_data)
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conn.sendall(response.encode())
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if __name__ == "__main__":
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main()
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