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#! /usr/bin/python3
# -*- test-case-name: twisted.mail.test.test_pop3client -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
import sys
from twisted.internet import reactor
from twisted.internet.protocol import Factory
from twisted.protocols import basic
USER = "test"
PASS = "twisted"
PORT = 1100
SSL_SUPPORT = True
UIDL_SUPPORT = True
INVALID_SERVER_RESPONSE = False
INVALID_CAPABILITY_RESPONSE = False
INVALID_LOGIN_RESPONSE = False
DENY_CONNECTION = False
DROP_CONNECTION = False
BAD_TLS_RESPONSE = False
TIMEOUT_RESPONSE = False
TIMEOUT_DEFERRED = False
SLOW_GREETING = False
"""Commands"""
CONNECTION_MADE = b"+OK POP3 localhost v2003.83 server ready"
CAPABILITIES = [b"TOP", b"LOGIN-DELAY 180", b"USER", b"SASL LOGIN"]
CAPABILITIES_SSL = b"STLS"
CAPABILITIES_UIDL = b"UIDL"
INVALID_RESPONSE = b"-ERR Unknown request"
VALID_RESPONSE = b"+OK Command Completed"
AUTH_DECLINED = b"-ERR LOGIN failed"
AUTH_ACCEPTED = b"+OK Mailbox open, 0 messages"
TLS_ERROR = b"-ERR server side error start TLS handshake"
LOGOUT_COMPLETE = b"+OK quit completed"
NOT_LOGGED_IN = b"-ERR Unknown AUHORIZATION state command"
STAT = b"+OK 0 0"
UIDL = b"+OK Unique-ID listing follows\r\n."
LIST = b"+OK Mailbox scan listing follows\r\n."
CAP_START = b"+OK Capability list follows:"
class POP3TestServer(basic.LineReceiver):
def __init__(self, contextFactory=None):
self.loggedIn = False
self.caps = None
self.tmpUser = None
self.ctx = contextFactory
def sendSTATResp(self, req):
self.sendLine(STAT)
def sendUIDLResp(self, req):
self.sendLine(UIDL)
def sendLISTResp(self, req):
self.sendLine(LIST)
def sendCapabilities(self):
if self.caps is None:
self.caps = [CAP_START]
if UIDL_SUPPORT:
self.caps.append(CAPABILITIES_UIDL)
if SSL_SUPPORT:
self.caps.append(CAPABILITIES_SSL)
for cap in CAPABILITIES:
self.caps.append(cap)
resp = b"\r\n".join(self.caps)
resp += b"\r\n."
self.sendLine(resp)
def connectionMade(self):
if DENY_CONNECTION:
self.disconnect()
return
if SLOW_GREETING:
reactor.callLater(20, self.sendGreeting)
else:
self.sendGreeting()
def sendGreeting(self):
self.sendLine(CONNECTION_MADE)
def lineReceived(self, line):
"""Error Conditions"""
uline = line.upper()
find = lambda s: uline.find(s) != -1
if TIMEOUT_RESPONSE:
# Do not respond to clients request
return
if DROP_CONNECTION:
self.disconnect()
return
elif find(b"CAPA"):
if INVALID_CAPABILITY_RESPONSE:
self.sendLine(INVALID_RESPONSE)
else:
self.sendCapabilities()
elif find(b"STLS") and SSL_SUPPORT:
self.startTLS()
elif find(b"USER"):
if INVALID_LOGIN_RESPONSE:
self.sendLine(INVALID_RESPONSE)
return
resp = None
try:
self.tmpUser = line.split(" ")[1]
resp = VALID_RESPONSE
except BaseException:
resp = AUTH_DECLINED
self.sendLine(resp)
elif find(b"PASS"):
resp = None
try:
pwd = line.split(" ")[1]
if self.tmpUser is None or pwd is None:
resp = AUTH_DECLINED
elif self.tmpUser == USER and pwd == PASS:
resp = AUTH_ACCEPTED
self.loggedIn = True
else:
resp = AUTH_DECLINED
except BaseException:
resp = AUTH_DECLINED
self.sendLine(resp)
elif find(b"QUIT"):
self.loggedIn = False
self.sendLine(LOGOUT_COMPLETE)
self.disconnect()
elif INVALID_SERVER_RESPONSE:
self.sendLine(INVALID_RESPONSE)
elif not self.loggedIn:
self.sendLine(NOT_LOGGED_IN)
elif find(b"NOOP"):
self.sendLine(VALID_RESPONSE)
elif find(b"STAT"):
if TIMEOUT_DEFERRED:
return
self.sendLine(STAT)
elif find(b"LIST"):
if TIMEOUT_DEFERRED:
return
self.sendLine(LIST)
elif find(b"UIDL"):
if TIMEOUT_DEFERRED:
return
elif not UIDL_SUPPORT:
self.sendLine(INVALID_RESPONSE)
return
self.sendLine(UIDL)
def startTLS(self):
if SSL_SUPPORT and self.ctx is not None:
self.sendLine(b"+OK Begin TLS negotiation now")
self.transport.startTLS(self.ctx)
else:
self.sendLine(b"-ERR TLS not available")
def disconnect(self):
self.transport.loseConnection()
usage = """popServer.py [arg] (default is Standard POP Server with no messages)
no_ssl - Start with no SSL support
no_uidl - Start with no UIDL support
bad_resp - Send a non-RFC compliant response to the Client
bad_cap_resp - send a non-RFC compliant response when the Client sends a 'CAPABILITY' request
bad_login_resp - send a non-RFC compliant response when the Client sends a 'LOGIN' request
deny - Deny the connection
drop - Drop the connection after sending the greeting
bad_tls - Send a bad response to a STARTTLS
timeout - Do not return a response to a Client request
to_deferred - Do not return a response on a 'Select' request. This
will test Deferred callback handling
slow - Wait 20 seconds after the connection is made to return a Server Greeting
"""
def printMessage(msg):
print("Server Starting in %s mode" % msg)
def processArg(arg):
if arg.lower() == "no_ssl":
global SSL_SUPPORT
SSL_SUPPORT = False
printMessage("NON-SSL")
elif arg.lower() == "no_uidl":
global UIDL_SUPPORT
UIDL_SUPPORT = False
printMessage("NON-UIDL")
elif arg.lower() == "bad_resp":
global INVALID_SERVER_RESPONSE
INVALID_SERVER_RESPONSE = True
printMessage("Invalid Server Response")
elif arg.lower() == "bad_cap_resp":
global INVALID_CAPABILITY_RESPONSE
INVALID_CAPABILITY_RESPONSE = True
printMessage("Invalid Capability Response")
elif arg.lower() == "bad_login_resp":
global INVALID_LOGIN_RESPONSE
INVALID_LOGIN_RESPONSE = True
printMessage("Invalid Capability Response")
elif arg.lower() == "deny":
global DENY_CONNECTION
DENY_CONNECTION = True
printMessage("Deny Connection")
elif arg.lower() == "drop":
global DROP_CONNECTION
DROP_CONNECTION = True
printMessage("Drop Connection")
elif arg.lower() == "bad_tls":
global BAD_TLS_RESPONSE
BAD_TLS_RESPONSE = True
printMessage("Bad TLS Response")
elif arg.lower() == "timeout":
global TIMEOUT_RESPONSE
TIMEOUT_RESPONSE = True
printMessage("Timeout Response")
elif arg.lower() == "to_deferred":
global TIMEOUT_DEFERRED
TIMEOUT_DEFERRED = True
printMessage("Timeout Deferred Response")
elif arg.lower() == "slow":
global SLOW_GREETING
SLOW_GREETING = True
printMessage("Slow Greeting")
elif arg.lower() == "--help":
print(usage)
sys.exit()
else:
print(usage)
sys.exit()
def main():
if len(sys.argv) < 2:
printMessage("POP3 with no messages")
else:
args = sys.argv[1:]
for arg in args:
processArg(arg)
f = Factory()
f.protocol = POP3TestServer
reactor.listenTCP(PORT, f)
reactor.run()
if __name__ == "__main__":
main()
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