pymaster: implement server-to-master challenge, implement ratelimiting, remove server remove handler it can be broken with IP spoofing, refactoring
This commit is contained in:
parent
3cbb519ccb
commit
c75a900443
210
pymaster.py
210
pymaster.py
|
@ -6,75 +6,131 @@ import traceback
|
|||
import logging
|
||||
import os
|
||||
from optparse import OptionParser
|
||||
from struct import pack
|
||||
from struct import pack, unpack
|
||||
from time import time
|
||||
from ipaddress import ip_address, ip_network
|
||||
|
||||
from server_entry import ServerEntry
|
||||
from protocol import MasterProtocol
|
||||
import ipfilter
|
||||
|
||||
LOG_FILENAME = 'pymaster.log'
|
||||
MAX_SERVERS_FOR_IP = 14
|
||||
CHALLENGE_SEND_PERIOD = 10
|
||||
|
||||
def logPrint( msg ):
|
||||
def log(msg):
|
||||
logging.debug(msg)
|
||||
|
||||
class RateLimitItem:
|
||||
def __init__(self, resetAt):
|
||||
self.reset(resetAt)
|
||||
|
||||
def reset(self, resetAt):
|
||||
self.resetAt = resetAt
|
||||
self.logs = self.calls = 0
|
||||
|
||||
def inc(self):
|
||||
self.calls = self.calls + 1
|
||||
self.logs = self.logs + 1
|
||||
|
||||
def shouldReset(self, curtime):
|
||||
return curtime > self.resetAt
|
||||
|
||||
class IPRateLimit:
|
||||
def __init__(self, type, period, maxcalls):
|
||||
self.type = type
|
||||
self.period = period
|
||||
self.maxcalls = maxcalls
|
||||
self.maxlogs = maxcalls + 2
|
||||
self.ips = {}
|
||||
|
||||
def ratelimit(self, ip):
|
||||
curtime = time()
|
||||
|
||||
if ip not in self.ips:
|
||||
self.ips[ip] = RateLimitItem(curtime + self.period)
|
||||
elif self.ips[ip].shouldReset(curtime):
|
||||
self.ips[ip].reset(curtime + self.period)
|
||||
|
||||
self.ips[ip].inc()
|
||||
|
||||
if self.ips[ip].calls > self.maxcalls:
|
||||
if self.ips[ip].logs < self.maxlogs:
|
||||
log('Ratelimited %s %s' % (self.type, ip))
|
||||
return True
|
||||
|
||||
return False
|
||||
|
||||
class PyMaster:
|
||||
def __init__(self, ip, port):
|
||||
self.serverList = []
|
||||
self.serverRL = IPRateLimit('server', 60, 30)
|
||||
self.clientRL = IPRateLimit('client', 60, 120)
|
||||
self.ipfilterRL = IPRateLimit('filterlog', 60, 10)
|
||||
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
|
||||
self.sock.bind((ip, port))
|
||||
|
||||
logPrint("Welcome to PyMaster!")
|
||||
logPrint("I ask you again, are you my master?")
|
||||
logPrint("Running on %s:%d" % (ip, port))
|
||||
log("Welcome to PyMaster!")
|
||||
log("I ask you again, are you my master?")
|
||||
log("Running on %s:%d" % (ip, port))
|
||||
|
||||
def serverLoop(self):
|
||||
data, addr = self.sock.recvfrom(1024)
|
||||
data = data.decode('latin_1')
|
||||
|
||||
if( data[0] == MasterProtocol.clientQuery ):
|
||||
self.clientQuery(data, addr)
|
||||
elif( data[0] == MasterProtocol.challengeRequest ):
|
||||
self.sendChallengeToServer(data, addr)
|
||||
elif( data[0] == MasterProtocol.addServer ):
|
||||
self.addServerToList(data, addr)
|
||||
elif( data[0] == MasterProtocol.removeServer ):
|
||||
self.removeServerFromList(data, addr)
|
||||
else:
|
||||
logPrint("Unknown message: {0} from {1}:{2}".format(data, addr[0], addr[1]))
|
||||
|
||||
def clientQuery(self, data, addr):
|
||||
region = data[1] # UNUSED
|
||||
data = data.strip('1' + region)
|
||||
try:
|
||||
query = data.split('\0')
|
||||
except ValueError:
|
||||
logPrint(traceback.format_exc())
|
||||
if ip_address(addr[0]) in ipfilter.ipfilter:
|
||||
if not self.ipfilterRL.ratelimit(addr[0]):
|
||||
log('Filter: %s:%d' % (addr[0], addr[1]))
|
||||
return
|
||||
|
||||
queryAddr = query[0] # UNUSED
|
||||
rawFilter = query[1]
|
||||
if len(data) == 0:
|
||||
return
|
||||
|
||||
# Remove first \ character
|
||||
rawFilter = rawFilter.strip('\\')
|
||||
split = rawFilter.split('\\')
|
||||
# only client stuff
|
||||
if data.startswith(MasterProtocol.clientQuery):
|
||||
if not self.clientRL.ratelimit(addr[0]):
|
||||
self.clientQuery(data, addr)
|
||||
return
|
||||
|
||||
# Use NoneType as undefined
|
||||
gamedir = 'valve' # halflife, by default
|
||||
# only server stuff
|
||||
if not self.serverRL.ratelimit(addr[0]):
|
||||
if data.startswith(MasterProtocol.challengeRequest):
|
||||
self.sendChallengeToServer(data, addr)
|
||||
elif data.startswith(MasterProtocol.addServer):
|
||||
self.addServerToList(data, addr)
|
||||
elif data.startswith(MasterProtocol.removeServer):
|
||||
self.removeServerFromList(data, addr)
|
||||
else:
|
||||
log('Unknown message: %s from %s:%d' % (str(data), addr[0], addr[1]))
|
||||
|
||||
def clientQuery(self, data, addr):
|
||||
data = data.decode('latin_1')
|
||||
data = data.strip('1' + data[1])
|
||||
info = data.split('\0')[1].strip('\\')
|
||||
split = info.split('\\')
|
||||
|
||||
protocol = None
|
||||
gamedir = 'valve'
|
||||
clver = None
|
||||
nat = 0
|
||||
|
||||
for i in range(0, len(split), 2):
|
||||
try:
|
||||
key = split[i + 1]
|
||||
if( split[i] == 'gamedir' ):
|
||||
gamedir = key.lower() # keep gamedir in lowercase
|
||||
elif( split[i] == 'nat' ):
|
||||
nat = int(key)
|
||||
elif( split[i] == 'clver' ):
|
||||
clver = key
|
||||
k = split[i]
|
||||
v = split[i + 1]
|
||||
if k == 'gamedir':
|
||||
gamedir = v.lower() # keep gamedir in lowercase
|
||||
elif k == 'nat':
|
||||
nat = int(v)
|
||||
elif k == 'clver':
|
||||
clver = v
|
||||
elif k == 'protocol':
|
||||
protocol = int(v)
|
||||
# somebody is playing :)
|
||||
elif k == 'thisismypcid' or k == 'heydevelopersifyoureadthis':
|
||||
self.fakeInfoForOldVersions(gamedir, addr)
|
||||
return
|
||||
else:
|
||||
logPrint('Unhandled info string entry: {0}/{1}. Infostring was: {2}'.format(split[i], key, split))
|
||||
log('Client Query: %s:%d, invalid infostring=%s' % (addr[0], addr[1], rawFilter))
|
||||
except IndexError:
|
||||
pass
|
||||
|
||||
|
@ -84,24 +140,22 @@ class PyMaster:
|
|||
|
||||
packet = MasterProtocol.queryPacketHeader
|
||||
for i in self.serverList:
|
||||
if( time() > i.die ):
|
||||
if time() > i.die:
|
||||
self.serverList.remove(i)
|
||||
continue
|
||||
|
||||
if( not i.check ):
|
||||
if not i.check:
|
||||
continue
|
||||
|
||||
if( nat != i.nat ):
|
||||
if nat != i.nat or gamedir != i.gamedir:
|
||||
continue
|
||||
|
||||
if( gamedir != None ):
|
||||
if( gamedir != i.gamedir ):
|
||||
if protocol != None and protocol != i.protocol:
|
||||
continue
|
||||
|
||||
if( nat ):
|
||||
reply = '\xff\xff\xff\xffc {0}:{1}'.format( addr[0], addr[1] )
|
||||
data = reply.encode( 'latin_1' )
|
||||
if nat:
|
||||
# Tell server to send info reply
|
||||
data = ('\xff\xff\xff\xffc %s:%d' % (addr[0], addr[1])).encode('latin_1')
|
||||
self.sock.sendto(data, i.addr)
|
||||
|
||||
# Use pregenerated address string
|
||||
|
@ -124,53 +178,65 @@ class PyMaster:
|
|||
sendFakeInfo(self.sock, "GooglePlay или GitHub", gamedir, addr)
|
||||
|
||||
def removeServerFromList(self, data, addr):
|
||||
for i in self.serverList:
|
||||
if (i.addr == addr):
|
||||
logPrint("Remove Server: from {0}:{1}".format(addr[0], addr[1]))
|
||||
self.serverList.remove(i)
|
||||
pass
|
||||
|
||||
def sendChallengeToServer(self, data, addr):
|
||||
logPrint("Challenge Request: from {0}:{1}".format(addr[0], addr[1]))
|
||||
# At first, remove old server- data from list
|
||||
#self.removeServerFromList(None, addr)
|
||||
|
||||
count = 0
|
||||
s = None
|
||||
for i in self.serverList:
|
||||
if ( i.addr[0] == addr[0] ):
|
||||
if( i.addr[1] == addr[1] ):
|
||||
self.serverList.remove(i)
|
||||
if addr[0] != i.addr[0]:
|
||||
continue
|
||||
if addr[1] == i.addr[1]:
|
||||
s = i
|
||||
break
|
||||
else:
|
||||
count += 1
|
||||
if( count > MAX_SERVERS_FOR_IP ):
|
||||
if count > MAX_SERVERS_FOR_IP:
|
||||
return
|
||||
|
||||
# Generate a 32 bit challenge number
|
||||
challenge = random.randint(0, 2**32-1)
|
||||
challenge2 = None
|
||||
if len(data) == 6:
|
||||
# little endian challenge
|
||||
challenge2 = unpack('<I', data[2:])[0]
|
||||
|
||||
# Add server to list
|
||||
self.serverList.append(ServerEntry(addr, challenge))
|
||||
if not s:
|
||||
challenge = random.randint(0, 2**32-1) & 0xffffffff #hash(addr[0]) + hash(addr[1]) + hash(time())
|
||||
s = ServerEntry(addr, challenge)
|
||||
self.serverList.append(s)
|
||||
elif s.sentChallengeAt + 5 > time():
|
||||
return
|
||||
|
||||
# And send him a challenge
|
||||
packet = MasterProtocol.challengePacketHeader
|
||||
packet += pack('I', challenge)
|
||||
packet += pack('I', s.challenge)
|
||||
|
||||
# send server-to-master challenge back
|
||||
if challenge2 is not None:
|
||||
packet += pack('I', challenge2)
|
||||
|
||||
self.sock.sendto(packet, addr)
|
||||
|
||||
def addServerToList(self, data, addr):
|
||||
logPrint("Add Server: from {0}:{1}".format(addr[0], addr[1]))
|
||||
# Remove the header. Just for better parsing.
|
||||
serverInfo = data.strip('\x30\x0a\x5c')
|
||||
info = data.strip(b'\x30\x0a\x5c').decode('latin_1')
|
||||
|
||||
# Find a server with same address
|
||||
for serverEntry in self.serverList:
|
||||
if( serverEntry.addr == addr ):
|
||||
s = None
|
||||
for s in self.serverList:
|
||||
if s.addr == addr:
|
||||
break
|
||||
if not s:
|
||||
log('Server skipped challenge request: %s:%d' % (addr[0], addr[1]))
|
||||
return
|
||||
|
||||
serverEntry.setInfoString( serverInfo )
|
||||
if s.setInfoString( info ):
|
||||
log('Add server: %s:%d, game=%s/%s, protocol=%d, players=%d/%d/%d, version=%s' % (addr[0], addr[1], s.gamemap, s.gamedir, s.protocol, s.players, s.bots, s.maxplayers, s.version))
|
||||
else:
|
||||
log('Failed challenge from %s:%d: %d must be %d' % (addr[0], addr[1], s.challenge, s.challenge2))
|
||||
|
||||
def spawn_pymaster(verbose, ip, port):
|
||||
if verbose:
|
||||
logging.getLogger().addHandler(logging.StreamHandler())
|
||||
logging.getLogger().addHandler(logging.FileHandler(LOG_FILENAME))
|
||||
# logging.getLogger().addHandler(logging.FileHandler(LOG_FILENAME))
|
||||
logging.getLogger().setLevel(logging.DEBUG)
|
||||
|
||||
masterMain = PyMaster(ip, port)
|
||||
|
@ -178,7 +244,7 @@ def spawn_pymaster(verbose, ip, port):
|
|||
try:
|
||||
masterMain.serverLoop()
|
||||
except Exception:
|
||||
logPrint(traceback.format_exc())
|
||||
log(traceback.format_exc())
|
||||
pass
|
||||
|
||||
if __name__ == "__main__":
|
||||
|
|
Loading…
Reference in New Issue