mirror of
https://github.com/mailcow/mailcow-dockerized.git
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55 lines
2.0 KiB
Python
Executable File
55 lines
2.0 KiB
Python
Executable File
#!/usr/bin/python3
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# Policy service of the mail policies (mailcow-policy in master.cf, spawned by Postfix): reads the policy requests
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# of smtpd and asks the mailcow UI for the action (nginx:8081/mailpolicy.php). Without an answer the recipient is
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# deferred; smtpd only asks while policies or internal aliases exist (mysql_mail_policy_maps.cf).
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import http.client
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import re
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import socket
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import sys
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from urllib.parse import urlencode
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# one line: DUNNO or a rejection with code and text
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valid_action = re.compile(rb'DUNNO|[45]\d\d [45]\.\d{1,3}\.\d{1,3} [\x20-\x7e]{1,200}')
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unavailable = b'DEFER_IF_PERMIT Mail policy check temporarily unavailable'
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# address of nginx, resolved once per process (a lookup costs more than the check)
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nginx = None
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def check(request):
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global nginx
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body = urlencode(sorted(request.items())).encode()
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try:
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if nginx is None:
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nginx = socket.gethostbyname('nginx')
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# http.client sets TCP_NODELAY, so the body is not held back until the headers are acknowledged
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# below the timeout of Postfix (main.cf), so an answer always arrives
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conn = http.client.HTTPConnection(nginx, 8081, timeout=8)
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try:
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conn.request('POST', '/mailpolicy.php', body, {'Host': 'nginx', 'Content-Type': 'application/x-www-form-urlencoded'})
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response = conn.getresponse()
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action = response.read()
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finally:
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conn.close()
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except (OSError, http.client.HTTPException):
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# nginx may have a new address after a restart
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nginx = None
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return unavailable
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return action if response.status == 200 and valid_action.fullmatch(action) else unavailable
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def main():
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request = {}
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# attributes as bytes: addresses may contain any 8-bit characters
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for line in sys.stdin.buffer:
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line = line.rstrip(b'\r\n')
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if line:
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name, separator, value = line.partition(b'=')
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if separator:
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request[name] = value
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continue
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sys.stdout.buffer.write(b'action=' + check(request) + b'\n\n')
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sys.stdout.buffer.flush()
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request = {}
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if __name__ == '__main__':
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main()
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