218 lines
8.5 KiB
Python
218 lines
8.5 KiB
Python
import asyncio
|
|
from aiosmtpd.controller import Controller
|
|
from email.parser import BytesParser
|
|
from email import policy
|
|
import os
|
|
import re
|
|
import time
|
|
import json
|
|
import hashlib
|
|
import configparser
|
|
from email.mime.multipart import MIMEMultipart
|
|
from email.mime.text import MIMEText
|
|
import logging
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
# globals for settings
|
|
DISCARD_UNKNOWN = False
|
|
DELETE_OLDER_THAN_DAYS = False
|
|
ATTACHMENTS_MAX_SIZE = 0
|
|
DOMAINS = []
|
|
LAST_CLEANUP = 0
|
|
URL = ""
|
|
|
|
class CustomHandler:
|
|
async def handle_DATA(self, server, session, envelope):
|
|
peer = session.peer
|
|
rcpts = []
|
|
for rcpt in envelope.rcpt_tos:
|
|
rcpts.append(rcpt)
|
|
|
|
logger.debug('Receiving message from: %s:%d' % peer)
|
|
logger.debug('Message addressed from: %s' % envelope.mail_from)
|
|
logger.debug('Message addressed to: %s' % str(rcpts))
|
|
|
|
filenamebase = str(int(round(time.time() * 1000)))
|
|
|
|
# Get the raw email data
|
|
raw_email = envelope.content.decode('utf-8')
|
|
|
|
# Parse the email
|
|
message = BytesParser(policy=policy.default).parsebytes(envelope.content)
|
|
|
|
# Separate HTML and plaintext parts
|
|
plaintext = ''
|
|
html = ''
|
|
attachments = {}
|
|
for part in message.walk():
|
|
if part.get_content_maintype() == 'multipart':
|
|
continue
|
|
if part.get_content_type() == 'text/plain':
|
|
#if it's a file
|
|
if part.get_filename() is not None:
|
|
att = self.handleAttachment(part)
|
|
if(att == False):
|
|
return '500 Attachment too large. Max size: ' + str(ATTACHMENTS_MAX_SIZE/1000000)+"MB"
|
|
attachments['file%d' % len(attachments)] = att
|
|
else:
|
|
plaintext += part.get_payload(decode=True).decode('utf-8')
|
|
elif part.get_content_type() == 'text/html':
|
|
html += part.get_payload()
|
|
else:
|
|
att = self.handleAttachment(part)
|
|
if(att == False):
|
|
return '500 Attachment too large. Max size: ' + str(ATTACHMENTS_MAX_SIZE/1000000)+"MB"
|
|
attachments['file%d' % len(attachments)] = att
|
|
|
|
for em in rcpts:
|
|
em = em.lower()
|
|
if not re.match(r"[^@\s]+@[^@\s]+\.[a-zA-Z0-9]+$", em):
|
|
logger.exception('Invalid recipient: %s' % em)
|
|
continue
|
|
|
|
domain = em.split('@')[1]
|
|
found = False
|
|
for x in DOMAINS:
|
|
if "*" in x and domain.endswith(x.replace('*', '')):
|
|
found = True
|
|
elif domain == x:
|
|
found = True
|
|
if(DISCARD_UNKNOWN and found==False):
|
|
logger.info('Discarding email for unknown domain: %s' % domain)
|
|
continue
|
|
|
|
if not os.path.exists("../data/"+em):
|
|
os.mkdir( "../data/"+em, 0o755 )
|
|
|
|
|
|
edata = {
|
|
'subject': message['subject'],
|
|
'body': plaintext,
|
|
'htmlbody': self.replace_cid_with_attachment_id(html, attachments,filenamebase,em),
|
|
'from': message['from'],
|
|
'attachments':[],
|
|
'attachments_details':[]
|
|
}
|
|
savedata = {'sender_ip':peer[0],
|
|
'from':message['from'],
|
|
'rcpts':rcpts,
|
|
'raw':raw_email,
|
|
'parsed':edata
|
|
}
|
|
|
|
#same attachments if any
|
|
for att in attachments:
|
|
if not os.path.exists("../data/"+em+"/attachments"):
|
|
os.mkdir( "../data/"+em+"/attachments", 0o755 )
|
|
attd = attachments[att]
|
|
file_id = attd[3]
|
|
file = open("../data/"+em+"/attachments/"+file_id, 'wb')
|
|
file.write(attd[1])
|
|
file.close()
|
|
edata["attachments"].append(file_id)
|
|
edata["attachments_details"].append({
|
|
"filename":attd[0],
|
|
"cid":attd[2],
|
|
"id":attd[3],
|
|
"download_url":URL+"/api/attachment/"+em+"/"+file_id,
|
|
"size":len(attd[1])
|
|
})
|
|
|
|
# save actual json data
|
|
with open("../data/"+em+"/"+filenamebase+".json", "w") as outfile:
|
|
json.dump(savedata, outfile)
|
|
|
|
return '250 OK'
|
|
|
|
def handleAttachment(self, part):
|
|
filename = part.get_filename()
|
|
if filename is None:
|
|
filename = 'untitled'
|
|
cid = part.get('Content-ID')
|
|
if cid is not None:
|
|
cid = cid[1:-1]
|
|
elif part.get('X-Attachment-Id') is not None:
|
|
cid = part.get('X-Attachment-Id')
|
|
else: # else create a unique id using md5 of the attachment
|
|
cid = hashlib.md5(part.get_payload(decode=True)).hexdigest()
|
|
fid = hashlib.md5(filename.encode('utf-8')).hexdigest()+filename
|
|
logger.debug('Handling attachment: "%s" (ID: "%s") of type "%s" with CID "%s"',filename, fid,part.get_content_type(), cid)
|
|
|
|
if(ATTACHMENTS_MAX_SIZE > 0 and len(part.get_payload(decode=True)) > ATTACHMENTS_MAX_SIZE):
|
|
logger.info("Attachment too large: " + filename)
|
|
return False
|
|
|
|
return (filename,part.get_payload(decode=True),cid,fid)
|
|
|
|
def replace_cid_with_attachment_id(self, html_content, attachments,filenamebase,email):
|
|
# Replace cid references with attachment filename
|
|
for attachment_id in attachments:
|
|
attachment = attachments[attachment_id]
|
|
filename = attachment[0]
|
|
cid = attachment[2]
|
|
if cid is None:
|
|
continue
|
|
cid = cid[1:-1]
|
|
if cid is not None:
|
|
html_content = html_content.replace('cid:' + cid, "/api/attachment/"+email+"/"+filenamebase+"-"+filename)
|
|
return html_content
|
|
|
|
def cleanup():
|
|
if(DELETE_OLDER_THAN_DAYS == False or time.time() - LAST_CLEANUP < 86400):
|
|
return
|
|
logger.info("Cleaning up")
|
|
rootdir = '../data/'
|
|
for subdir, dirs, files in os.walk(rootdir):
|
|
for file in files:
|
|
if(file.endswith(".json")):
|
|
filepath = os.path.join(subdir, file)
|
|
file_modified = os.path.getmtime(filepath)
|
|
if(time.time() - file_modified > (DELETE_OLDER_THAN_DAYS * 86400)):
|
|
os.remove(filepath)
|
|
logger.info("Deleted file: " + filepath)
|
|
|
|
async def run(port):
|
|
controller = Controller(CustomHandler(), hostname='0.0.0.0', port=port)
|
|
controller.start()
|
|
logger.info("[i] Ready to receive Emails")
|
|
logger.info("")
|
|
|
|
try:
|
|
while True:
|
|
await asyncio.sleep(1)
|
|
except KeyboardInterrupt:
|
|
controller.stop()
|
|
|
|
if __name__ == '__main__':
|
|
ch = logging.StreamHandler()
|
|
ch.setLevel(logging.DEBUG)
|
|
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
|
|
ch.setFormatter(formatter)
|
|
logger.setLevel(logging.DEBUG)
|
|
logger.addHandler(ch)
|
|
|
|
if not os.path.isfile("../config.ini"):
|
|
logger.info("[ERR] Config.ini not found. Rename example.config.ini to config.ini. Defaulting to port 25")
|
|
port = 25
|
|
else:
|
|
Config = configparser.ConfigParser(allow_no_value=True)
|
|
Config.read("../config.ini")
|
|
port = int(Config.get("MAILSERVER", "MAILPORT"))
|
|
if("discard_unknown" in Config.options("MAILSERVER")):
|
|
DISCARD_UNKNOWN = (Config.get("MAILSERVER", "DISCARD_UNKNOWN").lower() == "true")
|
|
DOMAINS = Config.get("GENERAL", "DOMAINS").lower().split(",")
|
|
URL = Config.get("GENERAL", "URL")
|
|
if("attachments_max_size" in Config.options("MAILSERVER")):
|
|
ATTACHMENTS_MAX_SIZE = int(Config.get("MAILSERVER", "ATTACHMENTS_MAX_SIZE"))
|
|
|
|
if("CLEANUP" in Config.sections() and "delete_older_than_days" in Config.options("CLEANUP")):
|
|
DELETE_OLDER_THAN_DAYS = (Config.get("CLEANUP", "DELETE_OLDER_THAN_DAYS").lower() == "true")
|
|
|
|
logger.info("[i] Starting Mailserver on port " + str(port))
|
|
logger.info("[i] Discard unknown domains: " + str(DISCARD_UNKNOWN))
|
|
logger.info("[i] Max size of attachments: " + str(ATTACHMENTS_MAX_SIZE))
|
|
logger.info("[i] Listening for domains: " + str(DOMAINS))
|
|
|
|
asyncio.run(run(port))
|