754 lines
27 KiB
Python
754 lines
27 KiB
Python
# PyMod-Milter is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# PyMod-Milter is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with PyMod-Milter. If not, see <http://www.gnu.org/licenses/>.
|
|
#
|
|
|
|
__all__ = [
|
|
"make_header",
|
|
"replace_illegal_chars",
|
|
"run",
|
|
"version",
|
|
"Modification",
|
|
"Rule",
|
|
"ModifyMilter"]
|
|
|
|
import Milter
|
|
import logging
|
|
import logging.handlers
|
|
import re
|
|
|
|
from Milter.utils import parse_addr
|
|
from bs4 import BeautifulSoup
|
|
from email.charset import Charset
|
|
from email.header import Header, decode_header
|
|
from email import message_from_binary_file
|
|
from email.message import MIMEPart
|
|
from email.policy import default as default_policy, SMTP
|
|
from io import BytesIO
|
|
from netaddr import IPAddress, IPNetwork, AddrFormatError
|
|
|
|
|
|
def make_header(decoded_seq, maxlinelen=None, header_name=None,
|
|
continuation_ws=' ', errors='strict'):
|
|
"""Create a Header from a sequence of pairs as returned by decode_header()
|
|
|
|
decode_header() takes a header value string and returns a sequence of
|
|
pairs of the format (decoded_string, charset) where charset is the string
|
|
name of the character set.
|
|
|
|
This function takes one of those sequence of pairs and returns a Header
|
|
instance. Optional maxlinelen, header_name, and continuation_ws are as in
|
|
the Header constructor.
|
|
"""
|
|
h = Header(maxlinelen=maxlinelen, header_name=header_name,
|
|
continuation_ws=continuation_ws)
|
|
for s, charset in decoded_seq:
|
|
# None means us-ascii but we can simply pass it on to h.append()
|
|
if charset is not None and not isinstance(charset, Charset):
|
|
charset = Charset(charset)
|
|
h.append(s, charset, errors=errors)
|
|
return h
|
|
|
|
|
|
def replace_illegal_chars(string):
|
|
"""Replace illegal characters in header values."""
|
|
return string.replace(
|
|
"\x00", "").replace(
|
|
"\r", "").replace(
|
|
"\n", "")
|
|
|
|
|
|
class Modification:
|
|
"""
|
|
Modification to implement certain modifications on e-mails.
|
|
|
|
Each modification function returns the necessary changes for ModifyMilter
|
|
so they can be applied to the email passing the MTA.
|
|
"""
|
|
|
|
def __init__(self, name, mod_type, log, **params):
|
|
self.logger = logging.getLogger(__name__)
|
|
self.logger.debug(f"initializing modification '{name}'")
|
|
self.name = name
|
|
self.log = log
|
|
# needs for each modification type
|
|
self.types = {
|
|
"add_header": {
|
|
"needs": ["headers"]},
|
|
"del_header": {
|
|
"needs": ["headers"]},
|
|
"mod_header": {
|
|
"needs": ["headers"]},
|
|
"add_disclaimer": {
|
|
"needs": ["headers", "data"]}}
|
|
|
|
if mod_type not in self.types:
|
|
raise RuntimeError(
|
|
f"{self.name}: invalid modification type '{mod_type}'")
|
|
|
|
self.mod_type = mod_type
|
|
|
|
try:
|
|
if mod_type == "add_header":
|
|
self.header = params["header"]
|
|
self.value = params["value"]
|
|
elif mod_type in ["del_header", "mod_header"]:
|
|
try:
|
|
self.header = re.compile(
|
|
params["header"],
|
|
re.MULTILINE + re.DOTALL + re.IGNORECASE)
|
|
except re.error as e:
|
|
raise RuntimeError(
|
|
f"{self.name}: unable to parse regex of "
|
|
f"option 'header': {e}")
|
|
|
|
if mod_type == "mod_header":
|
|
try:
|
|
self.search = re.compile(
|
|
params["search"],
|
|
re.MULTILINE + re.DOTALL + re.IGNORECASE)
|
|
except re.error as e:
|
|
raise RuntimeError(
|
|
f"{self.name}: unable to parse regex of "
|
|
f"option 'search': {e}")
|
|
|
|
self.value = params["value"]
|
|
elif mod_type == "add_disclaimer":
|
|
if params["action"] not in ["append", "prepend"]:
|
|
raise RuntimeError(
|
|
f"{self.name}: unknown action specified")
|
|
|
|
self.action = params["action"]
|
|
|
|
if params["error_policy"] not in ["wrap", "ignore", "reject"]:
|
|
raise RuntimeError(
|
|
f"{self.name}: unknown error_policy specified")
|
|
|
|
self.error_policy = params["error_policy"]
|
|
|
|
try:
|
|
with open(params["html_template"], "r") as f:
|
|
self.html = BeautifulSoup(f.read(), "html.parser")
|
|
body = self.html.find('body')
|
|
if body:
|
|
# just use content within the body tag if present
|
|
self.html = body
|
|
with open(params["text_template"], "r") as f:
|
|
self.text = f.read()
|
|
except IOError as e:
|
|
raise RuntimeError(f"unable to read template: {e}")
|
|
except KeyError as e:
|
|
raise RuntimeError(
|
|
f"{self.name}: mandatory configuration option not found: {e}")
|
|
|
|
def needs(self):
|
|
"""Return the needs of this modification to work."""
|
|
return self.types[self.mod_type]["needs"]
|
|
|
|
def add_header(self, qid, headers, header, value, pos=-1):
|
|
"""Add header to email."""
|
|
hdr = f"{header}: {value}"
|
|
if self.log:
|
|
self.logger.info(
|
|
f"{qid}: {self.name}: add_header: {hdr[0:70]}")
|
|
else:
|
|
self.logger.debug(
|
|
f"{qid}: {self.name}: add_header: {hdr}")
|
|
|
|
headers.append((header, value))
|
|
params = [header, value, pos]
|
|
return [("add_header", *params)]
|
|
|
|
def mod_header(self, qid, headers, header, search, replace):
|
|
"""Modify an email header."""
|
|
if isinstance(header, str):
|
|
header = re.compile(
|
|
header, re.MULTILINE + re.DOTALL + re.IGNORECASE)
|
|
|
|
if isinstance(search, str):
|
|
search = re.compile(
|
|
search, re.MULTILINE + re.DOTALL + re.IGNORECASE)
|
|
|
|
changes = []
|
|
index = 0
|
|
occurrences = {}
|
|
# iterate a copy of headers because headers may be modified
|
|
for name, value in headers.copy():
|
|
# keep track of the occurrence of each header
|
|
# needed by Milter.Base.chgheader
|
|
if name not in occurrences.keys():
|
|
occurrences[name] = 1
|
|
else:
|
|
occurrences[name] += 1
|
|
|
|
hdr = f"{name}: {value}"
|
|
if header.search(hdr):
|
|
new_value = search.sub(replace, value).strip()
|
|
if new_value == "":
|
|
self.logger.warning(
|
|
f"{qid}: {self.name}: mod_header: resulting value is "
|
|
f"empty, skip modification")
|
|
elif value != new_value:
|
|
old_hdr = hdr
|
|
hdr = f"{name}: {new_value}"
|
|
if self.log:
|
|
self.logger.info(
|
|
f"{qid}: {self.name}: mod_header: "
|
|
f"{old_hdr[0:70]}: {hdr[0:70]}")
|
|
else:
|
|
self.logger.debug(
|
|
f"{qid}: {self.name}: mod_header: "
|
|
f"(occ. {occurrences[name]}): {old_hdr}: "
|
|
f"{hdr}")
|
|
|
|
headers[index] = (name, new_value)
|
|
params = [name, new_value, occurrences[name]]
|
|
changes.append(("mod_header", *params))
|
|
|
|
index += 1
|
|
|
|
return changes
|
|
|
|
def del_header(self, qid, headers, header):
|
|
"""Delete an email header."""
|
|
if isinstance(header, str):
|
|
header = re.compile(
|
|
header, re.MULTILINE + re.DOTALL + re.IGNORECASE)
|
|
|
|
changes = []
|
|
index = 0
|
|
occurrences = {}
|
|
# iterate a copy of headers because headers may be modified
|
|
for name, value in headers.copy():
|
|
# keep track of the occurrence of each header,
|
|
# needed by Milter.Base.chgheader
|
|
if name not in occurrences.keys():
|
|
occurrences[name] = 1
|
|
else:
|
|
occurrences[name] += 1
|
|
|
|
hdr = f"{name}: {value}"
|
|
if header.search(hdr):
|
|
if self.log:
|
|
self.logger.info(
|
|
f"{qid}: {self.name}: del_header: "
|
|
f"{hdr[0:70]}")
|
|
else:
|
|
self.logger.debug(
|
|
f"{qid}: {self.name}: del_header: "
|
|
f"(occ. {occurrences[name]}): {hdr}")
|
|
|
|
del headers[index]
|
|
params = [name, "", occurrences[name]]
|
|
changes.append(("mod_header", *params))
|
|
index -= 1
|
|
occurrences[name] -= 1
|
|
|
|
index += 1
|
|
|
|
return changes
|
|
|
|
def add_disclaimer(self, qid, headers, fp, text_template, html_template,
|
|
error_policy):
|
|
"""Append or prepend a disclaimer to the email body."""
|
|
changes = []
|
|
|
|
fp.seek(0)
|
|
msg = message_from_binary_file(fp, policy=default_policy)
|
|
|
|
html_body = None
|
|
text_body = None
|
|
update_headers = False
|
|
|
|
try:
|
|
html_body = msg.get_body(preferencelist=("html"))
|
|
text_body = msg.get_body(preferencelist=("plain"))
|
|
except Exception as e:
|
|
self.logger.error(
|
|
f"{qid}: {self.name}: an error occured in "
|
|
f"email.message.EmailMessage.get_body: {e}")
|
|
|
|
if html_body is None and text_body is None:
|
|
if self.error_policy == "ignore":
|
|
self.logger.info(
|
|
f"{qid}: {self.name}: unable to find email body, "
|
|
f"ignore according to policy")
|
|
return changes
|
|
elif self.error_policy == "reject":
|
|
self.logger.info(
|
|
f"{qid}: {self.name}: unable to find email body, "
|
|
f"reject message according to policy")
|
|
return [
|
|
("reject", "Message rejected due to missing email body")]
|
|
|
|
self.logger.info(
|
|
f"{qid}: {self.name}: unable to find email body, "
|
|
f"wrapping original email in a new message envelope")
|
|
msg = MIMEPart()
|
|
msg.add_header("MIME-Version", "1.0")
|
|
msg.set_content(
|
|
"Please see the original email attached to this email.")
|
|
msg.add_alternative(
|
|
"Please see the original email attached to this email.",
|
|
subtype="html")
|
|
fp.seek(0)
|
|
msg.add_attachment(
|
|
fp.read(), maintype="plain", subtype="text",
|
|
filename="original_email.eml")
|
|
html_body = msg.get_body(preferencelist=("html"))
|
|
text_body = msg.get_body(preferencelist=("plain"))
|
|
# content and mime headers may have to be updated because
|
|
# a new message has been created
|
|
update_headers = True
|
|
elif not msg.is_multipart():
|
|
# content and mime headers may have to be updated because
|
|
# we operate on a non-multipart email
|
|
update_headers = True
|
|
|
|
if text_body is not None:
|
|
if self.log:
|
|
self.logger.info(
|
|
f"{qid}: {self.name}: {self.action} text disclaimer")
|
|
else:
|
|
self.logger.debug(
|
|
f"{qid}: {self.name}: {self.action} text disclaimer")
|
|
|
|
text = text_body.get_content()
|
|
if self.action == "prepend":
|
|
text = f"{text_template}{text}"
|
|
else:
|
|
text = f"{text}{text_template}"
|
|
|
|
text_body.set_content(
|
|
text.encode(), maintype="text", subtype="plain")
|
|
text_body.set_param("charset", "UTF-8", header="Content-Type")
|
|
|
|
if html_body is not None:
|
|
if self.log:
|
|
self.logger.info(
|
|
f"{qid}: {self.name}: {self.action} html disclaimer")
|
|
else:
|
|
self.logger.debug(
|
|
f"{qid}: {self.name}: {self.action} html disclaimer")
|
|
|
|
soup = BeautifulSoup(html_body.get_content(), "html.parser")
|
|
body = soup.find('body')
|
|
if body:
|
|
# work within the body tag if it is present
|
|
soup = body
|
|
|
|
if self.action == "prepend":
|
|
soup.insert(0, html_template)
|
|
else:
|
|
soup.append(html_template)
|
|
|
|
html_body.set_content(
|
|
str(soup).encode(), maintype="text", subtype="html")
|
|
html_body.set_param("charset", "UTF-8", header="Content-Type")
|
|
|
|
if update_headers:
|
|
for name, value in msg.items():
|
|
name_lower = name.lower()
|
|
if not name_lower.startswith("content-") and \
|
|
name_lower != "mime-version":
|
|
continue
|
|
|
|
defined = False
|
|
for n, v in headers:
|
|
if n.lower() == name_lower:
|
|
changes += self.mod_header(
|
|
qid, headers, f"^{n}:", ".*", value)
|
|
defined = True
|
|
break
|
|
|
|
if not defined:
|
|
changes += self.add_header(
|
|
qid, headers, name, value)
|
|
|
|
msg = msg.as_string(policy=SMTP).encode("ascii", errors="replace")
|
|
fp.seek(0)
|
|
fp.write(msg)
|
|
fp.truncate()
|
|
body_pos = msg.find(b"\r\n\r\n") + 2
|
|
changes.append(("mod_body", body_pos))
|
|
return changes
|
|
|
|
def execute(self, qid, headers, fp):
|
|
"""
|
|
Execute configured modification.
|
|
"""
|
|
changes = []
|
|
|
|
if self.mod_type == "add_header":
|
|
changes = self.add_header(
|
|
qid, headers, self.header, self.value)
|
|
elif self.mod_type == "mod_header":
|
|
changes = self.mod_header(
|
|
qid, headers, self.header, self.search, self.value)
|
|
elif self.mod_type == "del_header":
|
|
changes = self.del_header(
|
|
qid, headers, self.header)
|
|
elif self.mod_type == "add_disclaimer":
|
|
changes = self.add_disclaimer(
|
|
qid, headers, fp, self.text,
|
|
self.html, self.error_policy)
|
|
|
|
return changes
|
|
|
|
|
|
class Rule:
|
|
"""
|
|
Rule to implement multiple modifications on emails based on conditions.
|
|
"""
|
|
|
|
def __init__(self, name, modifications, local_addrs, log, conditions={},
|
|
pretend=False):
|
|
self.logger = logging.getLogger(__name__)
|
|
if pretend:
|
|
self.name = f"{name} (pretend)"
|
|
else:
|
|
self.name = name
|
|
|
|
self.logger.debug(f"initializing rule '{self.name}'")
|
|
self.log = log
|
|
self.pretend = pretend
|
|
self._needs = []
|
|
self._local_addrs = []
|
|
|
|
try:
|
|
for addr in local_addrs:
|
|
self._local_addrs.append(IPNetwork(addr))
|
|
except AddrFormatError as e:
|
|
raise RuntimeError(
|
|
f"{self.name}: unable to parse entry of "
|
|
f"option local_addrs: {e}")
|
|
|
|
self.conditions = {}
|
|
for option, value in conditions.items():
|
|
if option == "local":
|
|
self.conditions[option] = value
|
|
self.logger.debug(
|
|
f"{self.name}: added condition: {option} = {value}")
|
|
elif option == "hosts":
|
|
self.conditions[option] = []
|
|
try:
|
|
for host in value:
|
|
self.conditions[option].append(IPNetwork(host))
|
|
except AddrFormatError as e:
|
|
raise RuntimeError(
|
|
f"{self.name}: unable to parse entry of "
|
|
f"condition '{option}': {e}")
|
|
|
|
self.logger.debug(
|
|
f"{self.name}: added condition: {option} = {value}")
|
|
elif option in ["envfrom", "envto"]:
|
|
try:
|
|
self.conditions[option] = re.compile(value, re.IGNORECASE)
|
|
except re.error as e:
|
|
raise RuntimeError(
|
|
f"{self.name}: unable to parse regex of "
|
|
f"condition '{option}': {e}")
|
|
|
|
self.logger.debug(
|
|
f"{self.name}: added condition: {option} = {value}")
|
|
|
|
self.modifications = []
|
|
for mod_idx, mod in enumerate(modifications):
|
|
params = {}
|
|
if "name" not in mod:
|
|
mod["name"] = f"Modification #{mod_idx}"
|
|
|
|
if self.name:
|
|
params["name"] = f"{self.name}: {mod['name']}"
|
|
else:
|
|
params["name"] = mod["name"]
|
|
|
|
if "log" in mod:
|
|
params["log"] = mod["log"]
|
|
else:
|
|
params["log"] = self.log
|
|
|
|
if "type" in mod:
|
|
params["mod_type"] = mod["type"]
|
|
else:
|
|
raise RuntimeError(
|
|
f"{params['name']}: mandatory config "
|
|
f"option 'type' not found")
|
|
|
|
for param in [
|
|
"header", "search", "value", "action", "html_template",
|
|
"text_template", "error_policy"]:
|
|
if param in mod:
|
|
params[param] = mod[param]
|
|
|
|
modification = Modification(**params)
|
|
for need in modification.needs():
|
|
if need not in self._needs:
|
|
self._needs.append(need)
|
|
|
|
self.modifications.append(modification)
|
|
self.logger.debug(
|
|
f"{self.name}: added modification: {mod['name']}")
|
|
|
|
self.logger.debug(
|
|
f"{self.name}: rule needs: {self._needs}")
|
|
|
|
def needs(self):
|
|
"""Return the needs of this rule."""
|
|
return self._needs
|
|
|
|
def ignore_host(self, host):
|
|
"""Check if host is ignored by this rule."""
|
|
ip = IPAddress(host)
|
|
|
|
if "local" in self.conditions:
|
|
is_local = False
|
|
for addr in self._local_addrs:
|
|
if ip in addr:
|
|
is_local = True
|
|
break
|
|
|
|
if is_local != self.conditions["local"]:
|
|
return True
|
|
|
|
if "hosts" in self.conditions:
|
|
# check if host is in list
|
|
for accepted in self.conditions["hosts"]:
|
|
if ip in accepted:
|
|
return False
|
|
|
|
return True
|
|
|
|
return False
|
|
|
|
def ignore_envfrom(self, envfrom):
|
|
"""Check if envelope-from address is ignored by this rule."""
|
|
if "envfrom" in self.conditions:
|
|
if not self.conditions["envfrom"].search(envfrom):
|
|
return True
|
|
|
|
return False
|
|
|
|
def ignore_envto(self, envto):
|
|
"""Check if envelope-to address is ignored by this rule."""
|
|
if "envto" in self.conditions:
|
|
if not isinstance(envto, set):
|
|
envto = set(envto)
|
|
for to in envto:
|
|
if not self.conditions["envto"].search(to):
|
|
return True
|
|
|
|
return False
|
|
|
|
def execute(self, qid, headers, data):
|
|
"""Execute all modifications of this rule."""
|
|
changes = []
|
|
if self.log:
|
|
self.logger.info(f"{qid}: executing rule '{self.name}'")
|
|
else:
|
|
self.logger.debug(f"{qid}: executing rule '{self.name}'")
|
|
|
|
for mod in self.modifications:
|
|
self.logger.debug(f"{qid}: executing modification '{mod.name}'")
|
|
changes += mod.execute(qid, headers, data)
|
|
|
|
if self.pretend:
|
|
changes = []
|
|
return changes
|
|
|
|
|
|
class ModifyMilter(Milter.Base):
|
|
"""ModifyMilter based on Milter.Base to implement milter communication"""
|
|
|
|
_rules = []
|
|
|
|
@staticmethod
|
|
def set_rules(rules):
|
|
ModifyMilter._rules = rules
|
|
|
|
def __init__(self):
|
|
self.logger = logging.getLogger(__name__)
|
|
# save rules, it must not change during runtime
|
|
self.rules = ModifyMilter._rules.copy()
|
|
|
|
def connect(self, IPname, family, hostaddr):
|
|
self.logger.debug(
|
|
f"accepted milter connection from {hostaddr[0]} "
|
|
f"port {hostaddr[1]}")
|
|
ip = IPAddress(hostaddr[0])
|
|
|
|
# remove rules which ignore this host
|
|
for rule in self.rules.copy():
|
|
if rule.ignore_host(ip):
|
|
self.logger.debug(
|
|
f"host {hostaddr[0]} is ignored by rule '{rule.name}'")
|
|
self.rules.remove(rule)
|
|
|
|
if not self.rules:
|
|
self.logger.debug(
|
|
f"host {hostaddr[0]} is ignored by all rules, "
|
|
f"skip further processing")
|
|
return Milter.ACCEPT
|
|
|
|
return Milter.CONTINUE
|
|
|
|
def envfrom(self, mailfrom, *str):
|
|
mailfrom = "@".join(parse_addr(mailfrom)).lower()
|
|
for rule in self.rules.copy():
|
|
if rule.ignore_envfrom(mailfrom):
|
|
self.logger.debug(
|
|
f"envelope-from {mailfrom} is ignored by "
|
|
f"rule '{rule.name}'")
|
|
self.rules.remove(rule)
|
|
|
|
if not self.rules:
|
|
self.logger.debug(
|
|
f"envelope-from address {mailfrom} is ignored by all rules, "
|
|
f"skip further processing")
|
|
return Milter.ACCEPT
|
|
|
|
self.recipients = set()
|
|
return Milter.CONTINUE
|
|
|
|
@Milter.noreply
|
|
def envrcpt(self, to, *str):
|
|
self.recipients.add("@".join(parse_addr(to)).lower())
|
|
return Milter.CONTINUE
|
|
|
|
def data(self):
|
|
try:
|
|
for rule in self.rules.copy():
|
|
if rule.ignore_envto(self.recipients):
|
|
self.logger.debug(
|
|
f"envelope-to addresses are ignored by "
|
|
f"rule '{rule.name}'")
|
|
self.rules.remove(rule)
|
|
|
|
if not self.rules:
|
|
self.logger.debug(
|
|
f"envelope-to addresses are ignored by all rules, "
|
|
f"skip further processing")
|
|
return Milter.ACCEPT
|
|
|
|
self.qid = self.getsymval('i')
|
|
self.logger.debug(f"{self.qid}: received queue-id from MTA")
|
|
self.headers = None
|
|
self.fp = None
|
|
for rule in self.rules:
|
|
if "headers" in rule.needs() and self.headers is None:
|
|
self.headers = []
|
|
|
|
if "data" in rule.needs() and self.fp is None:
|
|
self.fp = BytesIO()
|
|
|
|
if None not in [self.headers, self.fp]:
|
|
break
|
|
|
|
except Exception as e:
|
|
self.logger.exception(
|
|
f"an exception occured in data function: {e}")
|
|
return Milter.TEMPFAIL
|
|
|
|
return Milter.CONTINUE
|
|
|
|
def header(self, name, value):
|
|
try:
|
|
# remove surrogates from value
|
|
value = value.encode(
|
|
errors="surrogateescape").decode(errors="replace")
|
|
if self.fp is not None:
|
|
self.fp.write(f"{name}: {value}\r\n".encode(
|
|
encoding="ascii", errors="replace"))
|
|
|
|
if self.headers is not None:
|
|
self.logger.debug(f"{self.qid}: received header: "
|
|
f"{name}: {value}")
|
|
header = make_header(decode_header(value), errors="replace")
|
|
value = str(header).replace("\x00", "")
|
|
self.logger.debug(
|
|
f"{self.qid}: decoded header: {name}: {value}")
|
|
self.headers.append((name, value))
|
|
except Exception as e:
|
|
self.logger.exception(
|
|
f"an exception occured in header function: {e}")
|
|
return Milter.TEMPFAIL
|
|
|
|
return Milter.CONTINUE
|
|
|
|
def eoh(self):
|
|
try:
|
|
if self.fp is not None:
|
|
self.fp.write(b"\r\n")
|
|
except Exception as e:
|
|
self.logger.exception(
|
|
f"an exception occured in eoh function: {e}")
|
|
return Milter.TEMPFAIL
|
|
|
|
return Milter.CONTINUE
|
|
|
|
def body(self, chunk):
|
|
try:
|
|
if self.fp is not None:
|
|
self.fp.write(chunk)
|
|
except Exception as e:
|
|
self.logger.exception(
|
|
f"an exception occured in body function: {e}")
|
|
return Milter.TEMPFAIL
|
|
|
|
return Milter.CONTINUE
|
|
|
|
def eom(self):
|
|
try:
|
|
changes = []
|
|
for rule in self.rules:
|
|
changes += rule.execute(self.qid, self.headers, self.fp)
|
|
|
|
mod_body_pos = None
|
|
for mod_type, *params in changes:
|
|
if mod_type in ["add_header", "mod_header", "del_header"]:
|
|
header, value, occurrence = params
|
|
enc_value = replace_illegal_chars(
|
|
Header(s=value).encode())
|
|
if mod_type == "add_header":
|
|
self.logger.debug(f"{self.qid}: milter: add "
|
|
f"header: {header}: {enc_value}")
|
|
self.addheader(header, enc_value, occurrence)
|
|
else:
|
|
if enc_value == "":
|
|
self.logger.debug(
|
|
f"{self.qid}: milter: delete "
|
|
f"header (occ. {occurrence}): "
|
|
f"{header}")
|
|
else:
|
|
self.logger.debug(
|
|
f"{self.qid}: milter: modify "
|
|
f"header (occ. {occurrence}): "
|
|
f"{header}: {enc_value}")
|
|
|
|
self.chgheader(header, occurrence, enc_value)
|
|
elif mod_type == "mod_body":
|
|
mod_body_pos = params[0]
|
|
elif mod_type == "reject":
|
|
self.setreply("554", "5.7.0", params[0])
|
|
return Milter.REJECT
|
|
|
|
if mod_body_pos is not None:
|
|
self.fp.seek(mod_body_pos)
|
|
self.logger.debug(f"{self.qid}: milter: replace body")
|
|
self.replacebody(self.fp.read())
|
|
except Exception as e:
|
|
self.logger.exception(
|
|
f"an exception occured in eom function: {e}")
|
|
return Milter.TEMPFAIL
|
|
|
|
return Milter.ACCEPT
|