Command handling in extra klassen ausgelagert
This commit is contained in:
trollhase
parent
aa0a319234
commit
4f9b38cd78
1 changed files with 267 additions and 153 deletions
294
fakeftp.py
294
fakeftp.py
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@ -3,8 +3,9 @@ import threading
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import socket
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from random import randint
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import datetime
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def mask(rights):
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class Utils:
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@staticmethod
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def mask(rights):
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m = ""
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if rights&4 != 0:
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m += "r"
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@ -23,9 +24,18 @@ def mask(rights):
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return m
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def _r( (u,g,o) ):
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@staticmethod
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def _r( (u,g,o) ):
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return ( (u&7) << 6 ) + ( (g&7) << 3 ) + (o&7)
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class Logger:
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def log(self, handler, message):
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pass
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class StdoutLogger:
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def log(self, handler, message):
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print "[%s] %s" % (handler.client_address[0],message)
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class FSNode:
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def __init__(self,name,owner="nobody",group="nobody",rights=(6,4,4),size=0, iun=1):
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self.name = name
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@ -33,11 +43,11 @@ class FSNode:
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self.group = group
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if type(rights) == tuple and len(rights) == 3:
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self.rights = _r( rights )
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self.rights = Utils._r( rights )
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elif type(rights) == int:
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self.rights = rights
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else:
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self.rights = _r( (6,4,4) )
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self.rights = Utils._r( (6,4,4) )
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self.size = size
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@ -86,9 +96,9 @@ class FSNode:
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m += "-"
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rights = self.get_rights()
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m += mask((rights >> 6)&7)
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m += mask((rights >> 3)&7)
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m += mask(rights&7)
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m += Utils.mask((rights >> 6)&7)
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m += Utils.mask((rights >> 3)&7)
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m += Utils.mask(rights&7)
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return m
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@ -340,6 +350,10 @@ class SystemTypeMessage(FTPMessage):
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def __init__(self, sys="UNIX",typ="L8"):
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FTPMessage.__init__(self,"215","%s Type: %s" % ( sys.upper(), typ ))
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class FatalServerErrorMessage(FTPMessage):
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def __init__(self):
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FTPMessage.__init__(self, "421", "Fatal server error")
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# Data Connection Handler
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class NListHandler:
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def __init__(self, directory, handler):
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@ -381,148 +395,246 @@ class RetrieveHandler:
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self.node.send_content(socket)
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self.handler.send( EndFileRetrieve() )
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# State classes
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class State:
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# CommandHandler classes
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class CommandHandler:
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cmd = None
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def process(self, handler, message):
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pass
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class MainState(State):
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class ForbiddenCommandHandler(CommandHandler):
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def process(self, handler, message):
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if message.cmd == "QUIT":
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handler.debug( "Quitting" )
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handler.send( QuitMessage() )
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handler.running = False
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else:
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if hasattr(self,'log'):
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handler.log(self.log % message.parameter)
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handler.send( OperationNotPermittedMessage() )
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class UnknownCommandHandler(CommandHandler):
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def process(self, handler, message):
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handler.log("Unknown command %s" % message.cmd)
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handler.send( InvalidCommandMessage(message.cmd) )
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class NonAuthorizedState(MainState):
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class QuitCommandHandler(CommandHandler):
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cmd = "QUIT"
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def process(self, handler, message):
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if message.cmd == "USER":
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handler.debug("Setting user to %s" % message.parameter)
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handler.log("Client quits")
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handler.send( QuitMessage() )
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handler.running = False
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class UserCommandHandler(CommandHandler):
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cmd = "USER"
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def process(self, handler, message):
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handler.log("Setting user to %s" % message.parameter)
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handler.user = message.parameter
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handler.state = AuthorizingState()
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handler.send( PasswordRequiredMessage(handler.user) )
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else:
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MainState.process(self, handler, message)
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class AuthorizingState(MainState):
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class PassCommandHandler(CommandHandler):
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cmd = "PASS"
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def process(self, handler, message):
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if message.cmd == "USER":
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handler.debug("Changing user to %s" % message.parameter)
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handler.user = message.parameter
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handler.send( PasswordRequiredMessage(handler.user) )
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elif message.cmd == "PASS":
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password = message.parameter
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if handler.authorizer.authorize(handler.user, password, handler):
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handler.debug("User login %s successful using password %s" % (handler.user,password))
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handler.log("User login %s successful using password %s" % (handler.user,password))
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handler.state = AuthorizedState()
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handler.send( AuthorizationSuccessfulMessage() )
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else:
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handler.debug("User login %s failed using password %s" % (handler.user, password) )
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handler.log("User login %s failed using password %s" % (handler.user, password) )
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handler.state = NonAuthorizedState()
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handler.send( AuthorizationFailedMessage() )
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else:
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MainState.process(self, handler, message)
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class AuthorizedState(MainState):
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class PasvCommandHandler(CommandHandler):
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cmd = "PASV"
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def process(self, handler, message):
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if message.cmd == "PASV":
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addr = handler.createPassiveDataConnection()
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handler.debug("Created passive data connection")
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handler.log("Create passive data connection")
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handler.send( EnteringPassiveModeMessage( addr ) )
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elif message.cmd == "DELE":
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handler.debug( "Attempt to delete file %s" % message.parameter )
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handler.send( OperationNotPermittedMessage() )
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elif message.cmd == "RMD":
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handler.debug( "Attempt to delete directory %s" % message.parameter )
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handler.send( OperationNotPermittedMessage() )
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elif message.cmd == "RNFR":
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handler.debug( "Attempt to rename %s" % message.parameter )
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handler.send( OperationNotPermittedMessage() )
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elif message.cmd == "RNTO":
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handler.debug( "Attempt to rename to %s" % message.parameter )
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handler.send( OperationNotPermittedMessage() )
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elif message.cmd == "STOR":
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handler.debug( "Attempt to store a file %s" % message.parameter )
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handler.send( OperationNotPermittedMessage() )
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elif message.cmd == "RETR":
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node = handler.get_node(message.parameter)
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if node.is_file():
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if handler.runDataConnection( RetrieveHandler(node, handler) ):
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handler.debug( "Retrieving file %s" % message.parameter )
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else:
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handler.send( UnableToBuildConnectionMessage() )
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else:
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handler.send( OperationNotPermittedMessage() )
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elif message.cmd == "PORT":
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class PortCommandHandler(CommandHandler):
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cmd = "PORT"
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def process(self, handler, message):
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hp = message.parameter.split(",")
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if len(hp) != 6:
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handler.send( InvalidParametersMessage() )
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return
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if int(hp[0]) == 10 or int(hp[0]) == 127 or int(hp[0]) == 192: #Prevent local scanning
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handler.debug( "Attempt to port to local network." )
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handler.log( "Attempt to port to local network." )
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handler.send( InvalidPortCommandMessage() )
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return
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addr = ( ".".join(hp[:4]), int(hp[4])<<8+int(hp[5]) )
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handler.debug( "Creating active data connection to %s:%d" % addr )
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handler.log( "Creating active data connection to %s:%d" % addr )
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handler.createActiveDataConnection(addr)
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handler.send( CommandSuccessfulMessage("PORT") )
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elif message.cmd == "LIST":
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class DeleteCommandHandler(ForbiddenCommandHandler):
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cmd = "DELE"
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log = "Attempt to delete file %s"
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class RemoveDirCommandHandler(ForbiddenCommandHandler):
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cmd = "RMD"
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log = "Attempt to delete directory %s"
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class RenameFromCommandHandler(ForbiddenCommandHandler):
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cmd = "RNFR"
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log = "Attempt to rename %s"
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class RenameToCommandHandler(ForbiddenCommandHandler):
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cmd = "RNTO"
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log = "Attempt to rename to %s"
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class StoreCommandHandler(ForbiddenCommandHandler):
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cmd = "STOR"
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log = "Attempt to store file %s"
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class RetrieveCommandHandler(CommandHandler):
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cmd = "RETR"
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def process(self, handler, message):
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node = handler.get_node(message.parameter)
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if node.is_file():
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if handler.runDataConnection( RetrieveHandler(node, handler) ):
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handler.log( "Retrieving file %s" % message.parameter )
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else:
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handler.send( UnableToBuildConnectionMessage() )
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else:
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handler.send( OperationNotPermittedMessage() )
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class ListCommandHandler(CommandHandler):
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cmd = "LIST"
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def process(self, handler, message):
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if handler.runDataConnection(ListHandler(handler.currentDirectory, handler)):
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handler.debug("Listing current directory")
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handler.log("Listing current directory")
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else:
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handler.send( UnableToBuildConnectionMessage() )
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elif message.cmd == "NLST":
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class SimpleListCommandHandler(CommandHandler):
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cmd = "NLST"
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def process(self, handler, message):
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if handler.runDataConnection(NListHandler(handler.currentDirectory)):
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handler.debug("Listing current directory (simple)")
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handler.log("Listing current directory (simple)")
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else:
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handler.send( UnableToBuildConnectionMessage() )
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elif message.cmd == "CWD":
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class ChangeWorkingDirectoryCommandHandler(CommandHandler):
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cmd = "CWD"
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def process(self, handler, message):
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node = handler.get_node(message.parameter)
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if node is None or not node.is_dir():
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handler.debug("Error trying to switch into non-existent directory")
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handler.log("Error trying to switch into non-existent directory")
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handler.send( ChangeDirectoryFailedMessage() )
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else:
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handler.currentDirectory = node
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handler.debug("Changed working directory to "+node.get_absolute_path())
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handler.log("Changed working directory to "+node.get_absolute_path())
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handler.send( ChangeDirectorySuccessfulMessage() )
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elif message.cmd == "CDUP":
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class ChangeDirectoryUpCommandHandler(CommandHandler):
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cmd = "CDUP"
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def process(self, handler, message):
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node = handler.currentDirectory.get_parent_directory()
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if node is None or not node.is_dir():
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handler.debug("Error trying to switch to non-existent parent directory")
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handler.log("Error trying to switch to non-existent parent directory")
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else:
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handler.debug("Changed working directory to "+node.get_absolute_path())
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handler.log("Changed working directory to "+node.get_absolute_path())
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handler.currentDirectory = node
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handler.send( ChangeDirectorySuccessfulMessage() )
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elif message.cmd == "PWD":
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handler.debug( "Printing working directory" )
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class PrintWorkingDirectoryCommandHandler(CommandHandler):
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cmd = "PWD"
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def process(self, handler, message):
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handler.log( "Printing working directory" )
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handler.send( WorkingDirectoryMessage(handler.currentDirectory.get_absolute_path()) )
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elif message.cmd == "TYPE":
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class SetTypeCommandHandler(CommandHandler):
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cmd = "TYPE"
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def process(self, handler, message):
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if message.parameter == "A":
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handler.debug("Setting type to ASCII")
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handler.log("Setting type to ASCII")
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handler.send( TypeSetMessage(message.parameter) )
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else:
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handler.debug("Unrecognized type %s" % message.parameter)
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handler.log("Unrecognized type %s" % message.parameter)
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handler.send( InvalidCommandMessage("TYPE") )
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elif message.cmd == "NOOP":
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handler.debug("No operation")
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class NoOperationCommandHandler(CommandHandler):
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cmd = "NOOP"
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def process(self, handler, message):
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handler.log("No operation")
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handler.send( CommandSuccessfulMessage("NOOP") )
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elif message.cmd == "SIZE":
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handler.debug("Requested size of %s" % message.parameter)
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class SizeCommandHandler(CommandHandler):
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cmd = "SIZE"
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def process(self, handler, message):
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handler.log("Requested size of %s" % message.parameter)
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handler.send( CommandNotAllowedInAscii("SIZE") )
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elif message.cmd == "ABOR":
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handler.debug("Aborting data connection")
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class AbortCommandHandler(CommandHandler):
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cmd = "ABOR"
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def process(self, handler, message):
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handler.log("Aborting data connection")
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handler.send( AbortSuccessfulMessage() )
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elif message.cmd == "SYST":
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handler.debug("Requested system type")
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class SystemTypeCommandHandler(CommandHandler):
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cmd = "SYST"
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def process(self, handler, message):
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handler.log("Requested system type")
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handler.send( SystemTypeMessage() )
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else:
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MainState.process(self, handler, message)
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# State classes
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class State:
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handlers = []
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defaulthandler = UnknownCommandHandler()
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@classmethod
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def get_handlers(cls):
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hlds = [] + cls.handlers
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for b in cls.__bases__:
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hlds += b.get_handlers()
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return hlds
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@classmethod
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def get_handler(cls, cmd):
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for hld in cls.get_handlers():
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if hld.cmd == cmd:
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return hld
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return cls.defaulthandler
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def process(self, handler, message):
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try:
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self.get_handler(message.cmd).process(handler,message)
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except Exception:
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handler.send( FatalServerErrorMessage() )
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handler.running = False
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class BaseState(State):
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handlers = [ QuitCommandHandler(), NoOperationCommandHandler() ]
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class NonAuthorizedState(BaseState):
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handlers = [ UserCommandHandler() ]
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class AuthorizingState(NonAuthorizedState):
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handlers = [ PassCommandHandler() ]
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class AuthorizedState(BaseState):
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handlers = [
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PasvCommandHandler(),
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PortCommandHandler(),
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DeleteCommandHandler(),
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RemoveDirCommandHandler(),
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RenameToCommandHandler(),
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RenameFromCommandHandler(),
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StoreCommandHandler(),
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RetrieveCommandHandler(),
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ListCommandHandler(),
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SimpleListCommandHandler(),
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ChangeWorkingDirectoryCommandHandler(),
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ChangeDirectoryUpCommandHandler(),
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PrintWorkingDirectoryCommandHandler(),
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SetTypeCommandHandler(),
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SizeCommandHandler(),
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AbortCommandHandler(),
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SystemTypeCommandHandler()
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]
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class LineReader:
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def __init__(self):
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@ -542,8 +654,10 @@ class LineReader:
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pos = self.buf.find("\n")
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class FTPHandler(SocketServer.BaseRequestHandler):
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def debug(self, text):
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print ("[%s] " % self.client_address[0]) + text
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logger = StdoutLogger()
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def log(self, message):
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self.logger.log(self,message)
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def send(self, message):
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self.request.send( str(message) )
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@ -594,7 +708,7 @@ class FTPHandler(SocketServer.BaseRequestHandler):
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self.state = NonAuthorizedState()
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self.debug("Client connected");
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self.log("Client connected");
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self.send( WelcomeMessage() )
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@ -613,7 +727,7 @@ class FTPHandler(SocketServer.BaseRequestHandler):
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message = FTPMessage.parse(line)
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self.state.process(self,message)
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self.debug("Client disconnected")
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self.log("Client disconnected")
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handler = FTPHandler
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handler.authorizer = AnonymousAuthorizer()
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