add option to store unparse msg and rework rules logic
This commit is contained in:
@@ -32,9 +32,10 @@ import json
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from Milter.utils import parse_addr
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from collections import defaultdict
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from email import message_from_binary_file
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from email.header import Header
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from email.parser import BytesFeedParser
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from email.policy import default as default_policy, SMTP
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from io import BytesIO
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from netaddr import IPNetwork, AddrFormatError
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from pymodmilter.base import CustomLogger, BaseConfig, MilterMessage
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@@ -92,6 +93,7 @@ class ModifyMilterConfig(BaseConfig):
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"should be list of strings"
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else:
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local_addrs = [
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"fe80::/64",
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"::1/128",
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"127.0.0.0/8",
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"10.0.0.0/8",
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@@ -139,12 +141,6 @@ class ModifyMilter(Milter.Base):
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self.logger = logging.getLogger(__name__)
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self.logger.setLevel(ModifyMilter._loglevel)
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# save rules, it must not change during runtime
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self.rules = ModifyMilter._rules.copy()
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self.msg = None
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self._replace_body = False
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def addheader(self, field, value, idx=-1):
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value = replace_illegal_chars(Header(s=value).encode())
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self.logger.debug(f"milter: addheader: {field}: {value}")
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@@ -181,28 +177,20 @@ class ModifyMilter(Milter.Base):
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self.addheader(field, value)
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def replacebody(self):
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self._replace_body = True
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self._replacebody = True
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def connect(self, IPname, family, hostaddr):
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try:
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if hostaddr is None:
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self.logger.error("unable to proceed, host address is None")
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self.logger.error(f"received invalid host address {hostaddr}, "
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f"unable to proceed")
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return Milter.TEMPFAIL
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self.IP = hostaddr[0]
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self.port = hostaddr[1]
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self.logger.debug(
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f"accepted milter connection from {hostaddr[0]} "
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f"port {hostaddr[1]}")
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# remove rules which ignore this host
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for rule in self.rules.copy():
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if rule.ignores(host=hostaddr[0]):
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self.rules.remove(rule)
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if not self.rules:
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self.logger.debug(
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f"host {hostaddr[0]} is ignored by all rules, "
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f"skip further processing")
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return Milter.ACCEPT
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f"accepted milter connection from {self.IP} "
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f"port {self.port}")
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except Exception as e:
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self.logger.exception(
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f"an exception occured in connect method: {e}")
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@@ -210,20 +198,21 @@ class ModifyMilter(Milter.Base):
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return Milter.CONTINUE
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def hello(self, heloname):
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try:
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self.heloname = heloname
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self.logger.debug(f"received HELO name: {heloname}")
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except Exception as e:
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self.logger.exception(
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f"an exception occured in hello method: {e}")
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return Milter.TEMPFAIL
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return Milter.CONTINUE
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def envfrom(self, mailfrom, *str):
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try:
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mailfrom = "@".join(parse_addr(mailfrom)).lower()
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for rule in self.rules.copy():
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if rule.ignores(envfrom=mailfrom):
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self.rules.remove(rule)
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if not self.rules:
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self.logger.debug(
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f"envelope-from address {mailfrom} is ignored by "
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f"all rules, skip further processing")
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return Milter.ACCEPT
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self.recipients = set()
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self.mailfrom = "@".join(parse_addr(mailfrom)).lower()
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self.rcpts = set()
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except Exception as e:
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self.logger.exception(
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f"an exception occured in envfrom method: {e}")
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@@ -233,7 +222,7 @@ class ModifyMilter(Milter.Base):
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def envrcpt(self, to, *str):
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try:
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self.recipients.add("@".join(parse_addr(to)).lower())
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self.rcpts.add("@".join(parse_addr(to)).lower())
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except Exception as e:
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self.logger.exception(
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f"an exception occured in envrcpt method: {e}")
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@@ -243,32 +232,25 @@ class ModifyMilter(Milter.Base):
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def data(self):
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try:
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for rule in self.rules.copy():
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if rule.ignores(envto=[*self.recipients]):
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self.rules.remove(rule)
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if not self.rules:
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self.logger.debug(
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"envelope-to addresses are ignored by all rules, "
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"skip further processing")
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return Milter.ACCEPT
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self.qid = self.getsymval('i')
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self.logger = CustomLogger(self.logger, {"qid": self.qid})
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self.logger.debug("received queue-id from MTA")
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self.fields = None
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self.fields_bytes = None
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self.body_data = None
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self.rules = []
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self._headersonly = True
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for rule in ModifyMilter._rules:
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if not rule.ignores(host=self.IP, envfrom=self.mailfrom,
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envto=[*self.rcpts]):
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self.rules.append(rule)
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if rule.need_body():
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self._headersonly = False
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self._fp = BytesFeedParser(
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_factory=MilterMessage, policy=default_policy)
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self._keep_body = False
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for rule in self.rules:
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if rule.need_body():
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self._keep_body = True
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break
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if not self.rules:
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self.logger.debug(
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"message is ignored by all rules, skip further processing")
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return Milter.ACCEPT
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self.fp = BytesIO()
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except Exception as e:
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self.logger.exception(
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f"an exception occured in data method: {e}")
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@@ -282,7 +264,7 @@ class ModifyMilter(Milter.Base):
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field = field.encode("ascii", errors="replace")
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value = value.encode("ascii", errors="replace")
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self._fp.feed(field + b": " + value + b"\r\n")
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self.fp.write(field + b": " + value + b"\r\n")
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except Exception as e:
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self.logger.exception(
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f"an exception occured in header method: {e}")
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@@ -292,7 +274,7 @@ class ModifyMilter(Milter.Base):
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def eoh(self):
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try:
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self._fp.feed(b"\r\n")
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self.fp.write(b"\r\n")
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except Exception as e:
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self.logger.exception(
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f"an exception occured in eoh method: {e}")
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@@ -302,8 +284,8 @@ class ModifyMilter(Milter.Base):
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def body(self, chunk):
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try:
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if self._keep_body:
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self._fp.feed(chunk)
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if not self._headersonly:
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self.fp.write(chunk)
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except Exception as e:
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self.logger.exception(
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f"an exception occured in body method: {e}")
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@@ -313,7 +295,19 @@ class ModifyMilter(Milter.Base):
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def eom(self):
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try:
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self.msg = self._fp.close()
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self.fp.seek(0)
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self.msg = message_from_binary_file(
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self.fp, _class=MilterMessage, policy=default_policy)
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self.msg_info = defaultdict(str)
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self.msg_info["ip"] = self.IP
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self.msg_info["port"] = self.port
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self.msg_info["heloname"] = self.heloname
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self.msg_info["envfrom"] = self.mailfrom
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self.msg_info["rcpts"] = self.rcpts
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self.msg_info["qid"] = self.qid
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self._replacebody = False
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milter_action = None
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for rule in self.rules:
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milter_action = rule.execute(self)
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@@ -321,7 +315,7 @@ class ModifyMilter(Milter.Base):
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if milter_action is not None:
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break
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if self._replace_body:
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if self._replacebody:
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data = self.msg.as_bytes(policy=SMTP)
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body_pos = data.find(b"\r\n\r\n") + 4
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self.logger.debug("milter: replacebody")
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