/
client_final.py
273 lines (192 loc) · 8.04 KB
/
client_final.py
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import socket
import sys
import utils
import encrypt
DATA_TRANSFER_SIZE = 1024
DEFAULT_PRIME = 197221152031991558322935568090317202983
DEFAULT_GENERATOR = 2
request = { "request_type": None,
"payload": None}
# "request_type": "authentication",
# "request_type": "message_1",
# "request_type": "message_3",
# "request_type": "file_transfer_init",
# "request_type": "file_transfer",
client_db = {"username": None, "password": None,
"pwd_digest": None, "client_Xa": None,
"client_eke": None, "client_Na": None,
"client_encrypted_final_nonce": None,
"prime_num": DEFAULT_PRIME, "generator": DEFAULT_GENERATOR,
"server_eke": None, "client_kas": None,
"server_enc_nonce": None
}
user_pswd_dict = {"username": None, "password": None}
message_1_payload = {"username": None, "prime_num" : None, "generator" : None,
"client_eke": None}
message_2_payload = {"server_eke": None, "server_encrypted_nonce" : None}
message_3_payload = {"username": None, "client_encrypted_final_nonce" : None}
file_transfer_payload = {"username": None, "filename": None }
password = None
user_name = None
def get_prime_and_gene():
return client_db['prime_num'], client_db['generator']
def get_user_cred():
username = raw_input("Enter your username:")
pwd = raw_input("Enter your password:")
# username = 'naren'
# pwd = 'password1'
user_pswd_dict['username'] = username
user_pswd_dict['password'] = pwd
client_db['username'] = username
client_db['password'] = pwd
client_db['pwd_digest'] = encrypt.generate_hash_digest(pwd)
return user_pswd_dict
def client_send_message_1(sd):
utils.print_trancsation_message("Client sending message 1")
# Fetching values of generator and prime number
p,g = get_prime_and_gene()
# client_Xa = int(raw_input("Please enter Xa value:"))
client_Xa = 17
client_db['client_Xa'] = client_Xa
client_eke = encrypt.get_eke(client_db['pwd_digest'],
client_Xa,g,p)
client_db['client_eke'] = client_eke
# Loading message payload
message_1_payload['username'] = client_db['username']
print "client_db['pwd_digest']", client_db['pwd_digest']
message_1_payload['client_eke'] = client_eke
message_1_payload['prime_num'] = p
message_1_payload['generator'] = g
request['request_type'] = 'message_1'
request['payload'] = message_1_payload
utils.print_dict("Payload 1",request)
utils.print_dict("Client db",client_db)
sd.sendall(str(request))
def client_recv_message_2(sd):
utils.print_trancsation_message("Client receiving message 2")
msg_2 = sd.recv(DATA_TRANSFER_SIZE)
message_2_payload = utils.get_dict_from_string(msg_2)
utils.print_dict("Payload 2", message_2_payload)
client_db['server_eke'] = message_2_payload['server_eke']
client_db['server_enc_nonce'] = message_2_payload['server_encrypted_nonce']
utils.print_dict("Client db",client_db)
def client_send_message_3(sd):
utils.print_trancsation_message("Client sending message 3")
message_3_payload['username'] = client_db['username']
server_dhkey = encrypt.decrypt_eke( client_db['server_eke'],
client_db['pwd_digest'])
client_kas = encrypt.generate_kas(server_dhkey,client_db['client_Xa'],
client_db['prime_num'])
client_db['client_kas'] = client_kas
client_db['client_Na'] = encrypt.get_random_number()
print "client_db['server_enc_nonce']", client_db['server_enc_nonce']
c_server_nonce = encrypt.decrypt_nonce(client_kas, client_db['server_enc_nonce'])
print "c_server_nonce:", c_server_nonce
final_nonce_c = encrypt.concat(c_server_nonce, client_db['client_Na'])
# Client encypting final nonce with kas
enc_final_nonce_c = encrypt.encrypt_nonce(client_kas, final_nonce_c)
message_3_payload['username'] = client_db['username']
message_3_payload['client_encrypted_final_nonce'] = enc_final_nonce_c
client_db['client_encrypted_final_nonce'] = enc_final_nonce_c
request['request_type'] = 'message_3'
request['payload'] = message_3_payload
utils.print_dict("Payload 3",request)
sd.sendall(str(request))
utils.print_dict("Client db",client_db)
utils.print_trancsation_message("With this send Server will know if the user is valid or not")
def client_recv_message_4(sd):
utils.print_trancsation_message("Client receiving message 4")
msg_4 = sd.recv(DATA_TRANSFER_SIZE)
message_4_payload = utils.get_dict_from_string(msg_4)
utils.print_dict("Payload 4", message_4_payload)
client_db[''] = message_4_payload['server_encrypted_Na']
utils.print_dict("Client db",client_db)
return message_4_payload['success']
def get_authenticated(sd):
user_creds = get_user_cred()
utils.print_dict("User Credentials",user_creds)
client_send_message_1(sd)
client_recv_message_2(sd)
client_send_message_3(sd)
success = client_recv_message_4(sd)
return success
def create_socket_connection(host="localhost", port="9090"):
port = int(port)
sd = socket.socket()
sd.connect((host,port))
return sd
def file_transfer_init(socket_descriptor, filename):
file_transfer_payload['filename'] = filename
file_transfer_payload['username'] = client_db['username']
request['request_type'] = "file_transfer_init"
request['payload'] = file_transfer_payload
utils.print_dict("File Init request",request)
socket_descriptor.sendall(str(request))
data = socket_descriptor.recv(DATA_TRANSFER_SIZE)
response = utils.get_dict_from_string(data)
utils.print_dict("File Init response",response)
if response['file_exists'] :
filesize = response['file_size']
message = raw_input("File Exists, " + str(filesize)+\
"Bytes, download? (Y/N)? -> ")
if message.lower() == 'Y'.lower():
# socket_descriptor.send('OK')
file_transfer(socket_descriptor, filename, int(filesize))
else:
print "File download canceled"
else:
print "File doesn't exist"
def file_transfer(socket_descriptor, filename, filesize):
file_transfer_payload['filename'] = filename
file_transfer_payload['username'] = client_db['username']
request['request_type'] = "file_transfer"
request['payload'] = file_transfer_payload
utils.print_dict("File Transfer Request",request)
socket_descriptor.sendall(str(request))
new_filename = 'new_' + filename
with open(new_filename, 'wb') as f:
print "new_filename ", new_filename
data = socket_descriptor.recv(DATA_TRANSFER_SIZE)
totalRecv = len(data)
f.write(data)
print "{0:.2f}".format((totalRecv/float(filesize))*100)+ "% Done"
print "Naren Total recv {}, file size {}".format(totalRecv, filesize)
while totalRecv < filesize:
print "before recv "
data = socket_descriptor.recv(DATA_TRANSFER_SIZE)
totalRecv += len(data)
f.write(data)
print "{0:.2f}".format((totalRecv/float(filesize))*100)+ "% Done"
print "Total recv {}, file size {}".format(totalRecv, filesize)
print "out of while loop"
return
def main():
host = sys.argv[1]
port = sys.argv[2]
#client_Xa = sys.argv[3]
if len(sys.argv) != 3:
print 'Usage: python %s <HostName> <PortNumber>' % (sys.argv[0])
sys.exit();
sd = create_socket_connection(host, port)
authorized = get_authenticated(sd)
if authorized:
print "yahooo"
else:
print "Boo!"
i = 1
while not authorized and i <= 3:
authorized = get_authenticated(sd)
i+=1
if authorized:
print "yahooo"
else:
print "Boo!"
if authorized == False and i >=3:
sd.close()
filename = raw_input("Filename?")
if filename != 'q':
file_transfer_init(sd,filename)
print "back to main"
sd.close()
if __name__ == '__main__':
main()