forked from thinkst/canarytokens
/
channel_input_smtp.py
199 lines (162 loc) · 6.55 KB
/
channel_input_smtp.py
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import re
from zope.interface import implements
from twisted.internet import defer
from twisted.mail import smtp
from twisted.cred.portal import IRealm
from twisted.cred.portal import Portal
from twisted.python import log
from twisted.application import internet
from twisted.application import service
from constants import INPUT_CHANNEL_SMTP
from tokens import Canarytoken
from canarydrop import Canarydrop
from exception import NoCanarytokenPresent, NoCanarytokenFound
from channel import InputChannel
from queries import get_canarydrop
class CanaryMessageDelivery:
implements(smtp.IMessageDelivery)
def __init__(self):
print 'Created CanaryMessageDelivery()'
def receivedHeader(self, helo, origin, recipients):
return "Received: CanaryMessageDelivery"
def validateFrom(self, helo, origin):
return origin
def validateTo(self, user):
# Only messages directed to the "console" user are accepted.
if user.dest.local == "console":
return lambda: CanaryMessage()
raise smtp.SMTPBadRcpt(user)
class CanaryMessage:
implements(smtp.IMessage)
def __init__(self, esmtp=None):
self.esmtp = esmtp
self.headers = []
self.headers_finished = False
self.attachments = []
self.links = []
self.links_re = re.compile('(http[s]?://[^\s\'"]+)', re.I)
self.mime_boundary = None
self.mime_boundary_re = re.compile('.*boundary[ ]*=[" ]?([^" ]+)')
self.in_mime_header = True
self.lines = []
self.stored_byte_count = 0
def lineReceived(self, line):
if line == '' and not self.headers_finished:
self.headers_finished = True
if not self.headers_finished:
self.headers.append(line)
m = self.mime_boundary_re.match(line)
if m:
self.mime_boundary = m.group(1)
else:
if self.mime_boundary:
if self.in_mime_header:
if line == '':
self.in_mime_header = False
else:
self.attachments[-1].append(line)
if self.mime_boundary in line:
self.in_mime_header = True
self.attachments.append([])
if self.stored_byte_count < 5*2**20: #5MB limit
self.lines.append(line)
self.stored_byte_count ++ len(line)
def eomReceived(self):
print "New message received:"
self.esmtp.mail['headers'] = self.headers
print "\n".join(self.headers)
self.esmtp.mail['links'] = self.links_re.findall(
'\r\n'.join(self.lines))
print "\n".join(self.links)
self.esmtp.mail['attachments'] = [ '\n'.join(x) for x in self.attachments]
print '\n\n'.join([ '\n'.join(x) for x in self.attachments])
self.lines = None
self.esmtp.dispatch()
#return defer.succeed(None)
d = defer.Deferred()
d.callback("Success")
return d
def connectionLost(self):
# There was an error, throw away the stored lines
self.lines = None
class CanaryESMTP(smtp.ESMTP):
def __init__(self, **kwargs):
smtp.ESMTP.__init__(self, **kwargs)
self.mail = {'recipients': [],
'sender': '',
'helo': {},
'headers': [],
'links': [],
'attachments': []}
def greeting(self,):
self.src_ip = self.transport.getPeer().host
try:
return self.factory.responses['greeting']
except KeyError:
return smtp.ESMTP.greeting(self)
def receivedHeader(self, helo, origin, recipients):
self.mail['helo']['client_name'] = helo[0]
self.mail['helo']['client_ip'] = helo[1]
self.mail['sender'] = origin
for r in recipients:
address = r.dest.addrstr
self.mail['recipients'].append(address)
def validateFrom(self, helo, origin):
return origin
def validateTo(self, user):
# Only messages directed to the "console" user are accepted.
try:
token = Canarytoken(value=user.dest.local)
self.canarydrop = Canarydrop(**get_canarydrop(canarytoken=token.value()))
return lambda: CanaryMessage(esmtp=self)
except (NoCanarytokenPresent, NoCanarytokenFound):
log.err('No token in recipient address: {address}'\
.format(address=user.dest.local))
except Exception as e:
log.err(e)
raise smtp.SMTPBadRcpt(user)
def dispatch(self,):
self.factory.dispatch(canarydrop=self.canarydrop, src_ip=self.src_ip,
mail=self.mail)
class CanarySMTPFactory(smtp.SMTPFactory, InputChannel):
protocol = CanaryESMTP
CHANNEL = INPUT_CHANNEL_SMTP
def __init__(self, *a, **kw):
self.responses = {'data_success': 'Finished', 'greeting': 'Hello there'}
self.switchboard = kw.pop('switchboard')
smtp.SMTPFactory.__init__(self, *a, **kw)
InputChannel.__init__(self, switchboard=self.switchboard,
name=self.CHANNEL,
unique_channel=False)
def buildProtocol(self, addr):
p = smtp.SMTPFactory.buildProtocol(self, addr)
# p.delivery = self.delivery
# p.challengers = {"LOGIN": LOGINCredentials, "PLAIN": PLAINCredentials}
return p
def format_additional_data(self, **kwargs):
log.msg('%r' % kwargs)
if kwargs.has_key('src_ip') and kwargs['src_ip']:
additional_report = 'Source IP : {ip}'.format(ip=kwargs['src_ip'])
if kwargs.has_key('mail') and kwargs['mail']:
mail = kwargs['mail']
additional_report += """
Client Name : {client_name}
Client IP : {client_ip}
Sender : {sender}
Recipients : {recipients}
Links : {links}
Attachments :
{attachments}
Headers :
{headers}""".format(
recipients = ', '.join(mail['recipients']),
sender = mail['sender'],
client_ip= mail['helo']['client_ip'],
client_name = mail['helo']['client_name'],
links = ', '.join(mail['links']),
attachments = '\n\n'.join(mail['attachments']),
headers = '\n'.join(mail['headers']))
return additional_report
class ChannelSMTP():
def __init__(self, port=25, switchboard=None):
self.service = internet.TCPServer(port, CanarySMTPFactory(None, switchboard=switchboard))