mirror of https://github.com/watcha-fr/synapse
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
221 lines
7.6 KiB
221 lines
7.6 KiB
# Copyright 2021 The Matrix.org C.I.C. Foundation
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
import email.utils
|
|
import logging
|
|
from email.mime.multipart import MIMEMultipart
|
|
from email.mime.text import MIMEText
|
|
from io import BytesIO
|
|
from typing import TYPE_CHECKING, Any, Optional
|
|
|
|
from pkg_resources import parse_version
|
|
|
|
import twisted
|
|
from twisted.internet.defer import Deferred
|
|
from twisted.internet.interfaces import IOpenSSLContextFactory
|
|
from twisted.internet.ssl import optionsForClientTLS
|
|
from twisted.mail.smtp import ESMTPSender, ESMTPSenderFactory
|
|
|
|
from synapse.logging.context import make_deferred_yieldable
|
|
from synapse.types import ISynapseReactor
|
|
|
|
if TYPE_CHECKING:
|
|
from synapse.server import HomeServer
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
_is_old_twisted = parse_version(twisted.__version__) < parse_version("21")
|
|
|
|
|
|
class _NoTLSESMTPSender(ESMTPSender):
|
|
"""Extend ESMTPSender to disable TLS
|
|
|
|
Unfortunately, before Twisted 21.2, ESMTPSender doesn't give an easy way to disable
|
|
TLS, so we override its internal method which it uses to generate a context factory.
|
|
"""
|
|
|
|
def _getContextFactory(self) -> Optional[IOpenSSLContextFactory]:
|
|
return None
|
|
|
|
|
|
async def _sendmail(
|
|
reactor: ISynapseReactor,
|
|
smtphost: str,
|
|
smtpport: int,
|
|
from_addr: str,
|
|
to_addr: str,
|
|
msg_bytes: bytes,
|
|
username: Optional[bytes] = None,
|
|
password: Optional[bytes] = None,
|
|
require_auth: bool = False,
|
|
require_tls: bool = False,
|
|
enable_tls: bool = True,
|
|
force_tls: bool = False,
|
|
) -> None:
|
|
"""A simple wrapper around ESMTPSenderFactory, to allow substitution in tests
|
|
|
|
Params:
|
|
reactor: reactor to use to make the outbound connection
|
|
smtphost: hostname to connect to
|
|
smtpport: port to connect to
|
|
from_addr: "From" address for email
|
|
to_addr: "To" address for email
|
|
msg_bytes: Message content
|
|
username: username to authenticate with, if auth is enabled
|
|
password: password to give when authenticating
|
|
require_auth: if auth is not offered, fail the request
|
|
require_tls: if TLS is not offered, fail the reqest
|
|
enable_tls: True to enable STARTTLS. If this is False and require_tls is True,
|
|
the request will fail.
|
|
force_tls: True to enable Implicit TLS.
|
|
"""
|
|
msg = BytesIO(msg_bytes)
|
|
d: "Deferred[object]" = Deferred()
|
|
|
|
def build_sender_factory(**kwargs: Any) -> ESMTPSenderFactory:
|
|
return ESMTPSenderFactory(
|
|
username,
|
|
password,
|
|
from_addr,
|
|
to_addr,
|
|
msg,
|
|
d,
|
|
heloFallback=True,
|
|
requireAuthentication=require_auth,
|
|
requireTransportSecurity=require_tls,
|
|
**kwargs,
|
|
)
|
|
|
|
if _is_old_twisted:
|
|
# before twisted 21.2, we have to override the ESMTPSender protocol to disable
|
|
# TLS
|
|
factory = build_sender_factory()
|
|
|
|
if not enable_tls:
|
|
factory.protocol = _NoTLSESMTPSender
|
|
else:
|
|
# for twisted 21.2 and later, there is a 'hostname' parameter which we should
|
|
# set to enable TLS.
|
|
factory = build_sender_factory(hostname=smtphost if enable_tls else None)
|
|
|
|
if force_tls:
|
|
reactor.connectSSL(
|
|
smtphost,
|
|
smtpport,
|
|
factory,
|
|
optionsForClientTLS(smtphost),
|
|
timeout=30,
|
|
bindAddress=None,
|
|
)
|
|
else:
|
|
reactor.connectTCP(
|
|
smtphost,
|
|
smtpport,
|
|
factory,
|
|
timeout=30,
|
|
bindAddress=None,
|
|
)
|
|
|
|
await make_deferred_yieldable(d)
|
|
|
|
|
|
class SendEmailHandler:
|
|
def __init__(self, hs: "HomeServer"):
|
|
self.hs = hs
|
|
|
|
self._reactor = hs.get_reactor()
|
|
|
|
self._from = hs.config.email.email_notif_from
|
|
self._smtp_host = hs.config.email.email_smtp_host
|
|
self._smtp_port = hs.config.email.email_smtp_port
|
|
|
|
user = hs.config.email.email_smtp_user
|
|
self._smtp_user = user.encode("utf-8") if user is not None else None
|
|
passwd = hs.config.email.email_smtp_pass
|
|
self._smtp_pass = passwd.encode("utf-8") if passwd is not None else None
|
|
self._require_transport_security = hs.config.email.require_transport_security
|
|
self._enable_tls = hs.config.email.enable_smtp_tls
|
|
self._force_tls = hs.config.email.force_tls
|
|
|
|
self._sendmail = _sendmail
|
|
|
|
async def send_email(
|
|
self,
|
|
email_address: str,
|
|
subject: str,
|
|
app_name: str,
|
|
html: str,
|
|
text: str,
|
|
) -> None:
|
|
"""Send a multipart email with the given information.
|
|
|
|
Args:
|
|
email_address: The address to send the email to.
|
|
subject: The email's subject.
|
|
app_name: The app name to include in the From header.
|
|
html: The HTML content to include in the email.
|
|
text: The plain text content to include in the email.
|
|
"""
|
|
try:
|
|
from_string = self._from % {"app": app_name}
|
|
except (KeyError, TypeError):
|
|
from_string = self._from
|
|
|
|
raw_from = email.utils.parseaddr(from_string)[1]
|
|
raw_to = email.utils.parseaddr(email_address)[1]
|
|
|
|
if raw_to == "":
|
|
raise RuntimeError("Invalid 'to' address")
|
|
|
|
html_part = MIMEText(html, "html", "utf8")
|
|
text_part = MIMEText(text, "plain", "utf8")
|
|
|
|
multipart_msg = MIMEMultipart("alternative")
|
|
multipart_msg["Subject"] = subject
|
|
multipart_msg["From"] = from_string
|
|
multipart_msg["To"] = email_address
|
|
multipart_msg["Date"] = email.utils.formatdate()
|
|
multipart_msg["Message-ID"] = email.utils.make_msgid()
|
|
# Discourage automatic responses to Synapse's emails.
|
|
# Per RFC 3834, automatic responses should not be sent if the "Auto-Submitted"
|
|
# header is present with any value other than "no". See
|
|
# https://www.rfc-editor.org/rfc/rfc3834.html#section-5.1
|
|
multipart_msg["Auto-Submitted"] = "auto-generated"
|
|
# Also include a Microsoft-Exchange specific header:
|
|
# https://learn.microsoft.com/en-us/openspecs/exchange_server_protocols/ms-oxcmail/ced68690-498a-4567-9d14-5c01f974d8b1
|
|
# which suggests it can take the value "All" to "suppress all auto-replies",
|
|
# or a comma separated list of auto-reply classes to suppress.
|
|
# The following stack overflow question has a little more context:
|
|
# https://stackoverflow.com/a/25324691/5252017
|
|
# https://stackoverflow.com/a/61646381/5252017
|
|
multipart_msg["X-Auto-Response-Suppress"] = "All"
|
|
multipart_msg.attach(text_part)
|
|
multipart_msg.attach(html_part)
|
|
|
|
logger.info("Sending email to %s" % email_address)
|
|
|
|
await self._sendmail(
|
|
self._reactor,
|
|
self._smtp_host,
|
|
self._smtp_port,
|
|
raw_from,
|
|
raw_to,
|
|
multipart_msg.as_string().encode("utf8"),
|
|
username=self._smtp_user,
|
|
password=self._smtp_pass,
|
|
require_auth=self._smtp_user is not None,
|
|
require_tls=self._require_transport_security,
|
|
enable_tls=self._enable_tls,
|
|
force_tls=self._force_tls,
|
|
)
|
|
|