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Client.py
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Client.py
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import socket, time, sys, thread, ip2country, errno
from collections import defaultdict
from BaseClient import BaseClient
import CryptoHandler
from CryptoHandler import encrypt_sign_message
from CryptoHandler import decrypt_auth_message
from CryptoHandler import int32_to_str
from CryptoHandler import str_to_int32
from CryptoHandler import DATA_MARKER_BYTE
from CryptoHandler import DATA_PARTIT_BYTE
from CryptoHandler import UNICODE_ENCODING
class Client(BaseClient):
'this object represents one server-side connected client'
def __init__(self, root, connection, address, session_id):
'initial setup for the connected client'
self._root = root
self.conn = connection
# detects if the connection is from this computer
if address[0].startswith('127.'):
if root.online_ip:
address = (root.online_ip, address[1])
elif root.local_ip:
address = (root.local_ip, address[1])
self.ip_address = address[0]
self.local_ip = address[0]
self.port = address[1]
self.setFlagByIP(self.ip_address)
self.session_id = session_id
self.db_id = session_id
self.handler = None
self.static = False
self._protocol = None
self.removing = False
self.sendError = False
self.msg_id = ''
self.msg_sendbuffer = []
self.enc_sendbuffer = []
self.sendingmessage = ''
## time-stamps for encrypted data
self.incoming_msg_ctr = 0
self.outgoing_msg_ctr = 1
## note: this NEVER becomes false after LOGIN!
self.logged_in = False
self.status = '12'
self.is_ingame = False
self.cpu = 0
self.access = 'fresh'
self.accesslevels = ['fresh','everyone']
self.channels = []
self.battle_bots = {}
self.current_battle = None
self.battle_bans = []
self.ingame_time = 0
self.went_ingame = 0
self.spectator = False
self.battlestatus = {'ready':'0', 'id':'0000', 'ally':'0000', 'mode':'0', 'sync':'00', 'side':'00', 'handicap':'0000000'}
self.teamcolor = '0'
## copies of the DB User values, set on successful LOGIN
self.set_user_pwrd_salt("", ("", ""))
self.email = ''
self.hostport = None
self.udpport = 0
self.bot = 0
self.floodlimit = {
'fresh':{'msglength':1024*32, 'bytespersecond':1024*32, 'seconds':2},
'user':{'msglength':1024*32, 'bytespersecond':1024*32, 'seconds':10},
'bot':{'msglength':1024, 'bytespersecond':10000, 'seconds':5},
'mod':{'msglength':10000, 'bytespersecond':10000, 'seconds':10},
'admin':{'msglength':10000, 'bytespersecond':100000, 'seconds':10},
}
self.msg_length_history = {}
self.lastsaid = {}
self.current_channel = ''
self.debug = False
self.data = ''
# holds compatibility flags - will be set by Protocol as necessary
self.compat = defaultdict(lambda: False)
self.scriptPassword = None
now = time.time()
self.last_login = now
self.failed_logins = 0
self.register_date = now
self.lastdata = now
self.last_id = 0
self.users = set([]) # session_id
self.battles = set([]) # [battle_id] = [user1, user2, user3, etc]
self.ignored = {}
self._root.console_write('Client connected from %s:%s, session ID %s.' % (self.ip_address, self.port, session_id))
## AES cipher used for encrypted protocol communication
## with this client; starts with a NULL session-key and
## becomes active when client sends SETSHAREDKEY
self.set_aes_cipher_obj(CryptoHandler.aes_cipher(""))
self.set_session_key("")
self.set_session_key_received_ack(False)
def set_aes_cipher_obj(self, obj): self.aes_cipher_obj = obj
def get_aes_cipher_obj(self): return self.aes_cipher_obj
def set_session_key_received_ack(self, b): self.session_key_received_ack = b
def get_session_key_received_ack(self): return self.session_key_received_ack
def set_session_key(self, key): self.aes_cipher_obj.set_key(key)
def get_session_key(self): return (self.aes_cipher_obj.get_key())
def use_secure_session(self): return (len(self.get_session_key()) != 0)
def use_msg_auth_codes(self): return (self._root.use_message_authent_codes)
def set_msg_id(self, msg):
self.msg_id = ""
if (not msg.startswith('#')):
return msg
test = msg.split(' ')[0][1:]
if (not test.isdigit()):
return msg
self.msg_id = '#%s ' % test
return (' '.join(msg.split(' ')[1:]))
def setFlagByIP(self, ip, force=True):
cc = ip2country.lookup(ip)
if force or cc != '??':
self.country_code = cc
def Bind(self, handler=None, protocol=None):
if handler: self.handler = handler
if protocol:
if not self._protocol:
protocol._new(self)
self._protocol = protocol
##
## handle data from client
##
def Handle(self, data):
if (self.access in self.floodlimit):
msg_limits = self.floodlimit[self.access]
else:
msg_limits = self.floodlimit['user']
now = int(time.time())
self.lastdata = now # data received, store time to detect disconnects
bytespersecond = msg_limits['bytespersecond']
seconds = msg_limits['seconds']
if (now in self.msg_length_history):
self.msg_length_history[now] += len(data)
else:
self.msg_length_history[now] = len(data)
total = 0
for iter in dict(self.msg_length_history):
if (iter < now - (seconds - 1)):
del self.msg_length_history[iter]
else:
total += self.msg_length_history[iter]
if total > (bytespersecond * seconds):
if not self.access in ('admin', 'mod'):
if (self.bot != 1):
# FIXME: no flood limit for these atm, need to do server-side shaping/bandwith limiting
self.Send('SERVERMSG No flooding (over %s per second for %s seconds)' % (bytespersecond, seconds))
self.Remove('Kicked for flooding (%s)' % (self.access))
return
## keep appending until we see at least one newline
self.data += data
## if too much data has accumulated without a newline, clear
if (len(self.data) > (msg_limits['msglength'] * 32)):
del self.data; self.data = ""; return
if (self.data.count('\n') == 0):
return
self.HandleProtocolCommands(self.data.split(DATA_PARTIT_BYTE), msg_limits)
def HandleProtocolCommands(self, split_data, msg_limits):
assert(type(split_data) == list)
assert(type(split_data[-1]) == str)
msg_length_limit = msg_limits['msglength']
check_msg_limits = (not ('disabled' in msg_limits))
## either a list of commands, or a list of encrypted data
## blobs which may contain embedded (post-decryption) NLs
##
## note: will be empty if len(split_data) == 1
raw_data_blobs = split_data[: len(split_data) - 1]
## will be a single newline in most cases, or an incomplete
## command which should be saved for a later time when more
## data is in buffer
self.data = split_data[-1]
commands_buffer = []
def check_message_timestamp(msg):
ctr = str_to_int32(msg)
if (ctr <= self.incoming_msg_ctr):
return False
self.incoming_msg_ctr = ctr
return True
for raw_data_blob in raw_data_blobs:
if (len(raw_data_blob) == 0):
continue
if (self.use_secure_session()):
dec_data_blob = decrypt_auth_message(self.aes_cipher_obj, raw_data_blob, self.use_msg_auth_codes())
## can only happen in case of an invalid MAC or missing timestamp
if (len(dec_data_blob) < 4):
continue
## handle an encrypted client command, using the AES session key
## previously exchanged between client and server by SETSHAREDKEY
## (this includes LOGIN and REGISTER, key can be set before login)
##
## this assumes (!) a client message to be of the form
## ENCODE(ENCRYPT_AES("CMD ARG1 ARG2 ...", AES_KEY))
## where ENCODE is the standard base64 encoding scheme
##
## if this is not the case (e.g. if a command was sent UNENCRYPTED
## by client after session-key exchange) the decryption will yield
## garbage and command will be rejected
##
## NOTE:
## blocks of encrypted data are always base64-encoded and will be
## separated by newlines, but after decryption might contain more
## embedded newlines themselves (e.g. if encryption was performed
## over *batches* of plaintext commands)
##
## client --> C=ENCODE(ENCRYPT("CMD1 ARG11 ARG12 ...\nCMD2 ARG21 ...\n"))
## server --> DECRYPT(DECODE(C))="CMD1 ARG11 ARG12 ...\nCMD2 ARG21 ...\n"
##
## ignore any replayed messages
if (not check_message_timestamp(dec_data_blob[0: 4])):
continue
split_commands = dec_data_blob[4: ].split(DATA_PARTIT_BYTE)
strip_commands = [(cmd.rstrip('\r')).lstrip(' ') for cmd in split_commands]
else:
if (raw_data_blob[0] == DATA_MARKER_BYTE):
continue
## strips leading spaces and trailing carriage returns
strip_commands = [(raw_data_blob.rstrip('\r')).lstrip(' ')]
commands_buffer += strip_commands
for command in commands_buffer:
if (check_msg_limits and (len(command) > msg_length_limit)):
self.Send('SERVERMSG message-length limit (%d) exceeded: command \"%s...\" dropped.' % (msg_length_limit, command[0: 8]))
else:
self.HandleProtocolCommand(command)
def HandleProtocolCommand(self, cmd):
## probably caused by trailing newline ("abc\n".split("\n") == ["abc", ""])
if (len(cmd) <= 1):
return
self._protocol._handle(self, cmd)
def Remove(self, reason='Quit'):
while self.msg_sendbuffer:
self.FlushBuffer()
self.handler.finishRemove(self, reason)
##
## send data to client
##
def Send(self, data, batch = True):
## don't append new data to buffer when client gets removed
if ((not data) or self.removing):
return
if (self.handler.thread == thread.get_ident()):
data = self.msg_id + data
## this *must* always succeed (protocol operates on
## unicode internally, but is otherwise fully ASCII
## and will never send raw binary data)
if (type(data) == unicode):
data = data.encode(UNICODE_ENCODING)
assert(type(data) == str)
def wrap_encrypt_sign_message(raw_msg):
raw_msg = int32_to_str(self.outgoing_msg_ctr) + raw_msg
enc_msg = encrypt_sign_message(self.aes_cipher_obj, raw_msg, self.use_msg_auth_codes())
self.outgoing_msg_ctr += 1
return enc_msg
buf = ""
if (self.use_secure_session()):
## buffer encrypted data until we get client ACK
## (the most recent message will be at the back)
##
## note: should not normally contain anything of
## value, server has little to send before LOGIN
self.enc_sendbuffer.append(data)
if (self.get_session_key_received_ack()):
self.enc_sendbuffer.reverse()
## encrypt everything in the queue
## message order in reversed queue is newest to
## oldest, but we pop() from the back so client
## receives in proper order
if (batch):
while (len(self.enc_sendbuffer) > 0):
buf += (self.enc_sendbuffer.pop() + DATA_PARTIT_BYTE)
## batch-encrypt into one blob (more efficient)
buf = wrap_encrypt_sign_message(buf)
else:
while (len(self.enc_sendbuffer) > 0):
buf += wrap_encrypt_sign_message(self.enc_sendbuffer.pop() + DATA_PARTIT_BYTE)
else:
buf = data + DATA_PARTIT_BYTE
if (len(buf) == 0):
return
self.msg_sendbuffer.append(buf)
self.handler.poller.setoutput(self.conn, True)
def FlushBuffer(self):
# client gets removed, delete buffers
if self.removing:
self.msg_sendbuffer = []
self.sendingmessage = None
return
if not self.sendingmessage:
message = ''
while not message:
if not self.msg_sendbuffer: # just in case, since it returns before going to the end...
self.handler.poller.setoutput(self.conn, False)
return
message = self.msg_sendbuffer.pop(0)
self.sendingmessage = message
senddata = self.sendingmessage# [:64] # smaller chunks interpolate better, maybe base this off of number of clients?
try:
sent = self.conn.send(senddata)
self.sendingmessage = self.sendingmessage[sent:] # only removes the number of bytes sent
except UnicodeDecodeError:
self.sendingmessage = None
self._root.console_write('Error sending unicode string, message dropped.')
except socket.error, e:
if e == errno.EAGAIN:
return
self.msg_sendbuffer = []
self.sendingmessage = None
self.handler.poller.setoutput(self.conn, bool(self.msg_sendbuffer or self.sendingmessage))
# Queuing
def AddUser(self, user):
if type(user) in (str, unicode):
try: user = self._root.usernames[user]
except: return
session_id = user.session_id
if session_id in self.users: return
self.users.add(session_id)
self._protocol.client_AddUser(self, user)
def RemoveUser(self, user):
if type(user) in (str, unicode):
try: user = self._root.usernames[user]
except: return
session_id = user.session_id
if session_id in self.users:
self.users.remove(session_id)
self._protocol.client_RemoveUser(self, user)
def SendUser(self, user, data):
if type(user) in (str, unicode):
try: user = self._root.usernames[user]
except: return
session_id = user.session_id
if session_id in self.users:
self.Send(data)
def AddBattle(self, battle):
battle_id = battle.id
if battle_id in self.battles: return
self.battles.add(battle_id)
self._protocol.client_AddBattle(self, battle)
def RemoveBattle(self, battle):
battle_id = battle.id
if battle_id in self.battles:
self.battles.remove(battle_id)
self._protocol.client_RemoveBattle(self, battle)
def SendBattle(self, battle, data):
battle_id = battle.id
if battle_id in self.battles:
self.Send(data)
def isAdmin(self):
return ('admin' in self.accesslevels)
def isMod(self):
return self.isAdmin() or ('mod' in self.accesslevels) # maybe cache these