mailcow/data/Dockerfiles/dovecot/quarantine_notify.py

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#!/usr/bin/python3
import smtplib
import os
import mysql.connector
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.utils import COMMASPACE, formatdate
import cgi
import jinja2
from jinja2 import Template
import json
import redis
import time
import html2text
import socket
while True:
try:
r = redis.StrictRedis(host='redis', decode_responses=True, port=6379, db=0)
r.ping()
except Exception as ex:
print('%s - trying again...' % (ex))
time.sleep(3)
else:
break
time_now = int(time.time())
def query_mysql(query, headers = True, update = False):
while True:
try:
cnx = mysql.connector.connect(unix_socket = '/var/run/mysqld/mysqld.sock', user='__DBUSER__', passwd='__DBPASS__', database='__DBNAME__', charset="utf8")
except Exception as ex:
print('%s - trying again...' % (ex))
time.sleep(3)
else:
break
cur = cnx.cursor()
cur.execute(query)
if not update:
result = []
columns = tuple( [d[0] for d in cur.description] )
for row in cur:
if headers:
result.append(dict(list(zip(columns, row))))
else:
result.append(row)
cur.close()
cnx.close()
return result
else:
cnx.commit()
cur.close()
cnx.close()
def notify_rcpt(rcpt, msg_count, quarantine_acl):
meta_query = query_mysql('SELECT SHA2(CONCAT(id, qid), 256) AS qhash, id, subject, score, sender, created FROM quarantine WHERE notified = 0 AND rcpt = "%s"' % (rcpt))
if r.get('Q_HTML'):
try:
template = Template(r.get('Q_HTML'))
except:
print("Error: Cannot parse quarantine template, falling back to default template.")
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with open('/templates/quarantine.tpl') as file_:
template = Template(file_.read())
else:
with open('/templates/quarantine.tpl') as file_:
template = Template(file_.read())
html = template.render(meta=meta_query, counter=msg_count, hostname=socket.gethostname(), quarantine_acl=quarantine_acl)
text = html2text.html2text(html)
count = 0
while count < 15:
try:
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server = smtplib.SMTP('postfix', 590, 'quarantine')
server.ehlo()
msg = MIMEMultipart('alternative')
msg_from = r.get('Q_SENDER') or "quarantine@localhost"
# Remove non-ascii chars from field
msg['From'] = ''.join([i if ord(i) < 128 else '' for i in msg_from])
msg['Subject'] = r.get('Q_SUBJ') or "Spam Quarantine Notification"
msg['Date'] = formatdate(localtime = True)
text_part = MIMEText(text, 'plain', 'utf-8')
html_part = MIMEText(html, 'html', 'utf-8')
msg.attach(text_part)
msg.attach(html_part)
msg['To'] = str(rcpt)
text = msg.as_string()
server.sendmail(msg['From'], msg['To'], text)
server.quit()
for res in meta_query:
query_mysql('UPDATE quarantine SET notified = 1 WHERE id = "%d"' % (res['id']), update = True)
r.hset('Q_LAST_NOTIFIED', record['rcpt'], time_now)
break
except Exception as ex:
server.quit()
print('%s' % (ex))
time.sleep(3)
records = query_mysql('SELECT IFNULL(user_acl.quarantine, 0) AS quarantine_acl, count(id) AS counter, rcpt FROM quarantine LEFT OUTER JOIN user_acl ON user_acl.username = rcpt WHERE notified = 0 AND rcpt in (SELECT username FROM mailbox) GROUP BY rcpt')
for record in records:
attrs = ''
attrs_json = ''
try:
last_notification = int(r.hget('Q_LAST_NOTIFIED', record['rcpt']))
if last_notification > time_now:
print('Last notification is > time now, assuming never')
last_notification = 0
except Exception as ex:
print('Could not determine last notification for %s, assuming never' % (record['rcpt']))
last_notification = 0
attrs_json = query_mysql('SELECT attributes FROM mailbox WHERE username = "%s"' % (record['rcpt']))
attrs = attrs_json[0]['attributes']
if isinstance(attrs, str):
# if attr is str then just load it
attrs = json.loads(attrs)
else:
# if it's bytes then decode and load it
attrs = json.loads(attrs.decode('utf-8'))
if attrs['quarantine_notification'] not in ('hourly', 'daily', 'weekly', 'never'):
print('Abnormal quarantine_notification value')
continue
if attrs['quarantine_notification'] == 'hourly':
if last_notification == 0 or (last_notification + 3600) < time_now:
print("Notifying %s about %d new items in quarantine" % (record['rcpt'], record['counter']))
notify_rcpt(record['rcpt'], record['counter'], record['quarantine_acl'])
elif attrs['quarantine_notification'] == 'daily':
if last_notification == 0 or (last_notification + 86400) < time_now:
print("Notifying %s about %d new items in quarantine" % (record['rcpt'], record['counter']))
notify_rcpt(record['rcpt'], record['counter'], record['quarantine_acl'])
elif attrs['quarantine_notification'] == 'weekly':
if last_notification == 0 or (last_notification + 604800) < time_now:
print("Notifying %s about %d new items in quarantine" % (record['rcpt'], record['counter']))
notify_rcpt(record['rcpt'], record['counter'], record['quarantine_acl'])