switch config to JSON format and new rules/modifications logic
This commit is contained in:
@@ -15,16 +15,16 @@
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__all__ = [
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"make_header",
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"replace_illegal_chars",
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"HeaderRule",
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"HeaderMilter"]
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"run",
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"version",
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"Modification",
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"Rule",
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"ModifyMilter"]
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import Milter
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import argparse
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import configparser
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import logging
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import logging.handlers
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import re
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import sys
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from Milter.utils import parse_addr
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from email.charset import Charset
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@@ -61,108 +61,74 @@ def replace_illegal_chars(string):
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"\n", "")
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class HeaderRule:
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"""HeaderRule to implement a rule to apply on e-mail headers."""
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class Modification:
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"""Modification to implement a modification to apply on e-mail headers."""
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def __init__(self, name, action, header, search="", value="",
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ignore_hosts=[], ignore_envfrom=None, only_hosts=[],
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log=True):
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types = {
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"add_header": ["header", "value"],
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"del_header": ["header"],
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"mod_header": ["header", "search", "value"]
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}
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def __init__(self, name, mod_type, log, **params):
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self.logger = logging.getLogger(__name__)
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self.logger.debug(f"initializing modification '{name}'")
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self.name = name
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self.action = action
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self.header = header
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self.search = search
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self.value = value
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self.ignore_hosts = ignore_hosts
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self.ignore_envfrom = ignore_envfrom
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self.only_hosts = only_hosts
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self.log = log
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# check mod_type
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if mod_type not in Modification.types:
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raise RuntimeError(
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f"{self.name}: invalid modification type '{mod_type}'")
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self.mod_type = mod_type
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# check if mandatory modification options are present in config
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for option in Modification.types[self.mod_type]:
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if option not in params:
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raise RuntimeError(
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f"{self.name}: mandatory config "
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f"option '{option}' not found")
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if option == "value" and not params["value"]:
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raise RuntimeError(
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f"{self.name}: empty value specified")
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if action in ["del", "mod"]:
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if mod_type == "add_header":
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self.header = params["header"]
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self.value = params["value"]
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elif mod_type in ["del_header", "mod_header"]:
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# compile header regex
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try:
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self.header = re.compile(
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header, re.MULTILINE + re.DOTALL + re.IGNORECASE)
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params["header"], re.MULTILINE + re.DOTALL + re.IGNORECASE)
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except re.error as e:
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raise RuntimeError(
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f"unable to parse option 'header' of rule '{name}': {e}")
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f"{self.name}: unable to parse regular expression of "
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f"option 'header': {e}")
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if action == "mod":
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if mod_type == "mod_header":
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# compile search regex
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try:
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self.search = re.compile(
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search, re.MULTILINE + re.DOTALL + re.IGNORECASE)
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params["search"],
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re.MULTILINE + re.DOTALL + re.IGNORECASE)
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except re.error as e:
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raise RuntimeError(
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f"unable to parse option 'search' of "
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f"rule '{name}': {e}")
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f"{self.name}: unable to parse regular expression of "
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f"option 'search': {e}")
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self.value = params["value"]
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if action in ["add", "mod"] and not value:
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raise RuntimeError("value of option 'value' is empty")
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# replace strings in ignore_hosts and only_hosts with IPNetwork
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# instances
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try:
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for index, ignore in enumerate(ignore_hosts):
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self.ignore_hosts[index] = IPNetwork(ignore)
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except AddrFormatError as e:
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raise RuntimeError(
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f"unable to parse option 'ignore_hosts' of rule '{name}': {e}")
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if self.ignore_envfrom:
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try:
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self.ignore_envfrom = re.compile(ignore_envfrom, re.IGNORECASE)
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except re.error as e:
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raise RuntimeError(
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f"unable to parse option 'ignore_envfrom' of "
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f"rule '{name}': {e}")
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try:
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for index, only in enumerate(only_hosts):
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self.only_hosts[index] = IPNetwork(only)
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except AddrFormatError as e:
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raise RuntimeError(
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f"unable to parse option 'only_hosts' of rule '{name}': {e}")
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def ignore_host(self, host):
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ip = IPAddress(host)
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ignore = False
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# check if host matches ignore_hosts
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for ignored in self.ignore_hosts:
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if ip in ignored:
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ignore = True
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break
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if not ignore and self.only_hosts:
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# host does not match ignore_hosts, check if it matches only_hosts
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ignore = True
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for only in self.only_hosts:
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if ip in only:
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ignore = False
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break
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if ignore:
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self.logger.debug(f"host {host} is ignored by rule {self.name}")
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return ignore
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def ignore_from(self, envfrom):
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ignore = False
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if self.ignore_envfrom:
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if self.ignore_envfrom.search(envfrom):
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ignore = True
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self.logger.debug(
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f"envelope-from {envfrom} is ignored by rule {self.name}")
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return ignore
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def execute(self, headers):
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def execute(self, qid, headers):
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"""
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Execute rule on given headers and return list
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with modified headers.
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"""
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if self.action == "add":
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return [(self.header, self.value, 0, 1)]
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if self.mod_type == "add_header":
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header = f"{self.header}: {self.value}"
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if self.log:
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self.logger.info(
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f"{qid}: {self.name}: add_header: {header[0:70]}")
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else:
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self.logger.debug(
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f"{qid}: {self.name}: add_header: {header}")
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return [(self.mod_type, self.header, self.value, 0, 1)]
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modified = []
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index = 0
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@@ -178,32 +144,184 @@ class HeaderRule:
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occurrences[name] += 1
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# check if header line matches regex
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if self.header.search(f"{name}: {value}"):
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if self.action == "del":
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header = f"{name}: {value}"
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if self.header.search(header):
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if self.mod_type == "del_header":
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# set an empty value to delete the header
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new_value = ""
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if self.log:
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self.logger.info(
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f"{qid}: {self.name}: del_header: "
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f"{header[0:70]}")
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else:
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self.logger.debug(
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f"{qid}: {self.name}: del_header: "
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f"(occ. {occurrences[name]}): {header}")
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else:
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old_header = header
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new_value = self.search.sub(self.value, value)
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if value != new_value:
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modified.append(
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(name, new_value, index, occurrences[name]))
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if value == new_value:
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continue
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header = f"{name}: {new_value}"
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if self.log:
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self.logger.info(
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f"{qid}: {self.name}: mod_header: "
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f"{old_header[0:70]}: {header[0:70]}")
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else:
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self.logger.debug(
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f"{qid}: {self.name}: mod_header: "
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f"(occ. {occurrences[name]}): {old_header}: "
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f"{header}")
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modified.append(
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(self.mod_type, name, new_value, index, occurrences[name]))
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index += 1
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return modified
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class HeaderMilter(Milter.Base):
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"""HeaderMilter based on Milter.Base to implement milter communication"""
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class Rule:
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def __init__(self, name, modifications, local_addrs, log, conditions={}):
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self.logger = logging.getLogger(__name__)
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self.name = name
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self.log = log
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self.logger.debug(f"initializing rule '{self.name}'")
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self._local_addrs = []
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# replace strings in local_addrs list with IPNetwork instances
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try:
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for addr in local_addrs:
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self._local_addrs.append(IPNetwork(addr))
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except AddrFormatError as e:
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raise RuntimeError(
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f"{self.name}: unable to parse entry of "
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f"option local_addrs: {e}")
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self.conditions = {}
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for option, value in conditions.items():
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if option == "local":
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self.conditions[option] = value
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self.logger.debug(
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f"{self.name}: added condition: {option} = {value}")
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elif option == "hosts":
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self.conditions[option] = []
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try:
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for host in value:
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self.conditions[option].append(IPNetwork(host))
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except AddrFormatError as e:
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raise RuntimeError(
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f"{self.name}: unable to parse entry of "
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f"condition '{option}': {e}")
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self.logger.debug(
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f"{self.name}: added condition: {option} = {value}")
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elif option == "envfrom":
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try:
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self.conditions[option] = re.compile(value, re.IGNORECASE)
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except re.error as e:
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raise RuntimeError(
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f"{self.name}: unable to parse regular expression of "
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f"condition '{option}': {e}")
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self.logger.debug(
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f"{self.name}: added condition: {option} = {value}")
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self.modifications = []
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for mod_idx, mod in enumerate(modifications):
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params = {}
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# set default values if not specified in config
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if "name" not in mod:
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mod["name"] = f"Modification #{mod_idx}"
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if self.name:
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params["name"] = f"{self.name}/{mod['name']}"
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else:
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params["name"] = mod["name"]
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if "log" in mod:
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params["log"] = mod["log"]
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else:
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params["log"] = self.log
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if "type" in mod:
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params["mod_type"] = mod["type"]
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else:
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raise RuntimeError(
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f"{params['name']}: mandatory config "
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f"option 'type' not found")
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if "header" in mod:
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params["header"] = mod["header"]
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if "search" in mod:
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params["search"] = mod["search"]
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if "value" in mod:
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params["value"] = mod["value"]
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self.modifications.append(Modification(**params))
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self.logger.debug(
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f"{self.name}: added modification: {mod['name']}")
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def ignore_host(self, host):
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ip = IPAddress(host)
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if "local" in self.conditions:
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is_local = False
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for addr in self._local_addrs:
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if ip in addr:
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is_local = True
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break
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if is_local != self.conditions["local"]:
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return True
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if "hosts" in self.conditions:
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# check if host is in list
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for accepted in self.conditions["hosts"]:
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if ip in accepted:
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return False
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return True
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return False
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def ignore_envfrom(self, envfrom):
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if "envfrom" in self.conditions:
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if not self.conditions["envfrom"].search(envfrom):
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return True
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return False
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def execute(self, qid, headers):
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changes = []
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if self.log:
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self.logger.info(f"{qid}: executing rule '{self.name}'")
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else:
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self.logger.debug(f"{qid}: executing rule '{self.name}'")
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for mod in self.modifications:
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self.logger.debug(f"{qid}: executing modification '{mod.name}'")
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result = mod.execute(qid, headers)
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changes += result
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for mod_type, name, value, index, occurrence in result:
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if mod_type == "add_header":
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headers.append((name, value))
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else:
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if mod_type == "mod_header":
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headers[index] = (name, value)
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elif mod_type == "del_header":
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del headers[index]
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return changes
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class ModifyMilter(Milter.Base):
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"""ModifyMilter based on Milter.Base to implement milter communication"""
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_rules = []
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@staticmethod
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def set_rules(rules):
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HeaderMilter._rules = rules
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ModifyMilter._rules = rules
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def __init__(self):
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self.logger = logging.getLogger(__name__)
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# save rules, it must not change during runtime
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self.rules = HeaderMilter._rules.copy()
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self.rules = ModifyMilter._rules.copy()
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def connect(self, IPname, family, hostaddr):
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self.logger.debug(
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@@ -214,6 +332,8 @@ class HeaderMilter(Milter.Base):
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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.ignore_host(ip):
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self.logger.debug(
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f"host {hostaddr[0]} is ignored by rule '{rule.name}'")
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self.rules.remove(rule)
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if not self.rules:
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@@ -226,7 +346,10 @@ class HeaderMilter(Milter.Base):
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def envfrom(self, mailfrom, *str):
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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.ignore_from(mailfrom):
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if rule.ignore_envfrom(mailfrom):
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self.logger.debug(
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f"envelope-from {mailfrom} is ignored by "
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f"rule '{rule.name}'")
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self.rules.remove(rule)
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if not self.rules:
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@@ -263,246 +386,21 @@ class HeaderMilter(Milter.Base):
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def eom(self):
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try:
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for rule in self.rules:
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self.logger.debug(f"{self.qid}: executing rule '{rule.name}'")
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modified = rule.execute(self.headers)
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for name, value, index, occurrence in modified:
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header = f"{name}: {value}"
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changes = rule.execute(self.qid, self.headers)
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for mod_type, name, value, index, occurrence in changes:
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enc_value = replace_illegal_chars(
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Header(s=value).encode())
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if rule.action == "add":
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if rule.log:
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self.logger.info(
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f"{self.qid}: add: header: "
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f"{header[0:70]}")
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else:
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self.logger.debug(
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f"{self.qid}: add: header: "
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f"{header}")
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self.headers.insert(0, (name, value))
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self.addheader(name, enc_value, 1)
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if mod_type == "add_header":
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self.logger.debug(f"{self.qid}: milter: adding "
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f"header: {name}: {enc_value}")
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self.addheader(name, enc_value, -1)
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else:
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if rule.action == "mod":
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old_header = "{}: {}".format(*self.headers[index])
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if rule.log:
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self.logger.info(
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f"{self.qid}: modify: header: "
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f"{old_header[0:70]}: {header[0:70]}")
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else:
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self.logger.debug(
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f"{self.qid}: modify: header "
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f"(occ. {occurrence}): {old_header}: "
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f"{header}")
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self.headers[index] = (name, value)
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elif rule.action == "del":
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if rule.log:
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self.logger.info(
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f"{self.qid}: delete: header: "
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f"{header[0:70]}")
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else:
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self.logger.debug(
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f"{self.qid}: delete: header "
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f"(occ. {occurrence}): {header}")
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del self.headers[index]
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self.logger.debug(f"{self.qid}: milter: modify "
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f"header (occ. {occurrence}): "
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f"{name}: {enc_value}")
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self.chgheader(name, occurrence, enc_value)
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return Milter.ACCEPT
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except Exception as e:
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self.logger.exception(
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f"an exception occured in eom function: {e}")
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return Milter.TEMPFAIL
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def main():
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"Run PyMod-Milter."
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# parse command line
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parser = argparse.ArgumentParser(
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description="PyMod milter daemon",
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formatter_class=lambda prog: argparse.HelpFormatter(
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prog, max_help_position=45, width=140))
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parser.add_argument(
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"-c", "--config", help="Config file to read.",
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default="/etc/pymodmilter.conf")
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parser.add_argument(
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"-s",
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"--socket",
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help="Socket used to communicate with the MTA.",
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required=True)
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parser.add_argument(
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"-d",
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"--debug",
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help="Log debugging messages.",
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action="store_true")
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parser.add_argument(
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"-t",
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"--test",
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help="Check configuration.",
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||||
action="store_true")
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args = parser.parse_args()
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|
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# setup logging
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||||
loglevel = logging.INFO
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logname = "pymodmilter"
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||||
syslog_name = logname
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if args.debug:
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||||
loglevel = logging.DEBUG
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logname = f"{logname}[%(name)s]"
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syslog_name = f"{syslog_name}: [%(name)s] %(levelname)s"
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|
||||
# set config files for milter class
|
||||
root_logger = logging.getLogger()
|
||||
root_logger.setLevel(loglevel)
|
||||
|
||||
# setup console log
|
||||
stdouthandler = logging.StreamHandler(sys.stdout)
|
||||
stdouthandler.setLevel(logging.DEBUG)
|
||||
formatter = logging.Formatter("%(message)s")
|
||||
stdouthandler.setFormatter(formatter)
|
||||
root_logger.addHandler(stdouthandler)
|
||||
logger = logging.getLogger(__name__)
|
||||
|
||||
try:
|
||||
# read config file
|
||||
parser = configparser.ConfigParser()
|
||||
if not parser.read(args.config):
|
||||
raise RuntimeError("config file not found")
|
||||
|
||||
# check if mandatory config options in global section are present
|
||||
if "global" not in parser.sections():
|
||||
raise RuntimeError(
|
||||
"mandatory section 'global' not present in config file")
|
||||
for option in ["rules"]:
|
||||
if not parser.has_option("global", option):
|
||||
raise RuntimeError(
|
||||
f"mandatory option '{option}' not present in config "
|
||||
f"section 'global'")
|
||||
|
||||
# read global config section
|
||||
global_config = dict(parser.items("global"))
|
||||
|
||||
# read active rules
|
||||
active_rules = [r.strip() for r in global_config["rules"].split(",")]
|
||||
if len(active_rules) != len(set(active_rules)):
|
||||
raise RuntimeError(
|
||||
"at least one rule is specified multiple times "
|
||||
"in 'rules' option")
|
||||
if "global" in active_rules:
|
||||
active_rules.remove("global")
|
||||
logger.warning(
|
||||
"removed illegal rule name 'global' from list of "
|
||||
"active rules")
|
||||
if not active_rules:
|
||||
raise RuntimeError("no rules configured")
|
||||
|
||||
logger.debug("preparing milter configuration ...")
|
||||
rules = []
|
||||
# iterate active rules
|
||||
for rule_name in active_rules:
|
||||
# check if config section exists
|
||||
if rule_name not in parser.sections():
|
||||
raise RuntimeError(
|
||||
f"config section '{rule_name}' does not exist")
|
||||
config = dict(parser.items(rule_name))
|
||||
|
||||
# check if mandatory option action is present in config
|
||||
option = "action"
|
||||
if option not in config.keys() and \
|
||||
option in global_config.keys():
|
||||
config[option] = global_config[option]
|
||||
if option not in config.keys():
|
||||
raise RuntimeError(
|
||||
f"mandatory option '{option}' not specified for "
|
||||
f"rule '{rule_name}'")
|
||||
config["action"] = config["action"].lower()
|
||||
if config["action"] not in ["add", "del", "mod"]:
|
||||
raise RuntimeError(
|
||||
f"invalid action specified for rule '{rule_name}'")
|
||||
|
||||
# check if mandatory options are present in config
|
||||
mandatory = ["header"]
|
||||
if config["action"] == "add":
|
||||
mandatory += ["value"]
|
||||
elif config["action"] == "mod":
|
||||
mandatory += ["search", "value"]
|
||||
for option in mandatory:
|
||||
if option not in config.keys() and \
|
||||
option in global_config.keys():
|
||||
config[option] = global_config[option]
|
||||
if option not in config.keys():
|
||||
raise RuntimeError(
|
||||
f"mandatory option '{option}' not specified for "
|
||||
f"rule '{rule_name}'")
|
||||
|
||||
# check if optional config options are present in config
|
||||
defaults = {
|
||||
"ignore_hosts": [],
|
||||
"ignore_envfrom": None,
|
||||
"only_hosts": [],
|
||||
"log": "true"
|
||||
}
|
||||
for option in defaults.keys():
|
||||
if option not in config.keys() and \
|
||||
option in global_config.keys():
|
||||
config[option] = global_config[option]
|
||||
if option not in config.keys():
|
||||
config[option] = defaults[option]
|
||||
if config["ignore_hosts"]:
|
||||
config["ignore_hosts"] = [
|
||||
h.strip() for h in config["ignore_hosts"].split(",")]
|
||||
if config["only_hosts"]:
|
||||
config["only_hosts"] = [
|
||||
h.strip() for h in config["only_hosts"].split(",")]
|
||||
config["log"] = config["log"].lower()
|
||||
if config["log"] == "true":
|
||||
config["log"] = True
|
||||
elif config["log"] == "false":
|
||||
config["log"] = False
|
||||
else:
|
||||
raise RuntimeError(
|
||||
f"invalid value specified for option 'log' for "
|
||||
f"rule '{rule_name}'")
|
||||
|
||||
# add rule
|
||||
logging.debug(f"adding rule '{rule_name}'")
|
||||
rules.append(HeaderRule(name=rule_name, **config))
|
||||
|
||||
except RuntimeError as e:
|
||||
logger.error(e)
|
||||
sys.exit(255)
|
||||
|
||||
if args.test:
|
||||
print("Configuration ok")
|
||||
sys.exit(0)
|
||||
|
||||
# change log format for runtime
|
||||
formatter = logging.Formatter(
|
||||
f"%(asctime)s {logname}: [%(levelname)s] %(message)s",
|
||||
datefmt="%Y-%m-%d %H:%M:%S")
|
||||
stdouthandler.setFormatter(formatter)
|
||||
|
||||
# setup syslog
|
||||
sysloghandler = logging.handlers.SysLogHandler(
|
||||
address="/dev/log", facility=logging.handlers.SysLogHandler.LOG_MAIL)
|
||||
sysloghandler.setLevel(loglevel)
|
||||
formatter = logging.Formatter(f"{syslog_name}: %(message)s")
|
||||
sysloghandler.setFormatter(formatter)
|
||||
root_logger.addHandler(sysloghandler)
|
||||
|
||||
logger.info("pymodmilter starting")
|
||||
HeaderMilter.set_rules(rules)
|
||||
|
||||
# register milter factory class
|
||||
Milter.factory = HeaderMilter
|
||||
Milter.set_exception_policy(Milter.TEMPFAIL)
|
||||
|
||||
rc = 0
|
||||
try:
|
||||
Milter.runmilter("pymodmilter", socketname=args.socket, timeout=30)
|
||||
except Milter.milter.error as e:
|
||||
logger.error(e)
|
||||
rc = 255
|
||||
logger.info("pymodmilter terminated")
|
||||
sys.exit(rc)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
|
||||
Reference in New Issue
Block a user