75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
import time
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import sys
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import logging
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import Milter
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from Milter.utils import parse_addr
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import re
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# Basic logger that also logs to stdout
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# TODO: Improve this a lot.
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logger = logging.getLogger(__name__)
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logger.setLevel(logging.DEBUG)
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handler = logging.StreamHandler(sys.stdout)
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handler.setLevel(logging.DEBUG)
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formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
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handler.setFormatter(formatter)
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logger.addHandler(handler)
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split_from_regex = re.compile('(?P<from_label>("(.*)")|(.*))(.*)<(?P<from_address>.*)>')
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def splitFromHeader(value):
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match = split_from_regex.match(value)
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result = {
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'label': match.group('from_label').strip(),
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'address': match.group('from_address').strip()
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}
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return result
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class SuspiciousFrom(Milter.Base):
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def __init__(self):
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self.id = Milter.uniqueID()
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logger.info(f"{self.id} got fired up.")
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self.milter_final_result = Milter.ACCEPT
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self.new_headers = []
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def header(self, field, value):
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if field.lower() == 'from':
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logger.info(f"Got \"From:\" header with raw value: '{value}'")
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split = splitFromHeader(value)
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logger.info(f"Label: {split['label']}, address: {split['address']}")
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if '@' in split['label']:
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self.milter_final_result = Milter.REJECT
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else:
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self.new_headers.append({'name': 'X-From-Checked', 'value': 'Yes, no address in label.'})
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# Supposedly no additional address in the label, accept it for now
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# TODO: Also decode utf-8 weirdness and check in there
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self.milter_final_result = Milter.ACCEPT
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return Milter.CONTINUE
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else:
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return Milter.CONTINUE
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def eom(self):
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# Finish up message according to results collected on the way.
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for new_header in self.new_headers:
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self.addheader(new_header['name'], new_header['value'])
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return self.milter_final_result
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def main():
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milter_socket = "inet:7777@127.0.0.1"
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milter_timeout = 60
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Milter.factory = SuspiciousFrom
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logger.info(f"Starting Milter.")
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# This call blocks the main thread.
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Milter.runmilter("SuspiciousFromMilter", milter_socket, milter_timeout, rmsock=False)
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logger.info(f"Milter finished running.")
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if __name__ == "__main__":
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logger.debug(f"Hello world!")
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main()
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