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anonymousland-synapse/synapse/config/emailconfig.py
Richard van der Hoff 74d7336686
Add a setting to disable TLS for sending email (#10546) 
This is mostly useful in case the server offers TLS, but doesn't present a valid certificate.
2021-08-06 10:13:34 +00:00

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# Copyright 2015-2016 OpenMarket Ltd
# Copyright 2017-2018 New Vector Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# 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.
# This file can't be called email.py because if it is, we cannot:
import email.utils
import os
from enum import Enum
from typing import Optional
import attr
from ._base import Config, ConfigError
MISSING_PASSWORD_RESET_CONFIG_ERROR = """\
Password reset emails are enabled on this homeserver due to a partial
'email' block. However, the following required keys are missing:
%s
"""
DEFAULT_SUBJECTS = {
"message_from_person_in_room": "[%(app)s] You have a message on %(app)s from %(person)s in the %(room)s room...",
"message_from_person": "[%(app)s] You have a message on %(app)s from %(person)s...",
"messages_from_person": "[%(app)s] You have messages on %(app)s from %(person)s...",
"messages_in_room": "[%(app)s] You have messages on %(app)s in the %(room)s room...",
"messages_in_room_and_others": "[%(app)s] You have messages on %(app)s in the %(room)s room and others...",
"messages_from_person_and_others": "[%(app)s] You have messages on %(app)s from %(person)s and others...",
"invite_from_person": "[%(app)s] %(person)s has invited you to chat on %(app)s...",
"invite_from_person_to_room": "[%(app)s] %(person)s has invited you to join the %(room)s room on %(app)s...",
"invite_from_person_to_space": "[%(app)s] %(person)s has invited you to join the %(space)s space on %(app)s...",
"password_reset": "[%(server_name)s] Password reset",
"email_validation": "[%(server_name)s] Validate your email",
}
@attr.s(slots=True, frozen=True)
class EmailSubjectConfig:
message_from_person_in_room = attr.ib(type=str)
message_from_person = attr.ib(type=str)
messages_from_person = attr.ib(type=str)
messages_in_room = attr.ib(type=str)
messages_in_room_and_others = attr.ib(type=str)
messages_from_person_and_others = attr.ib(type=str)
invite_from_person = attr.ib(type=str)
invite_from_person_to_room = attr.ib(type=str)
invite_from_person_to_space = attr.ib(type=str)
password_reset = attr.ib(type=str)
email_validation = attr.ib(type=str)
class EmailConfig(Config):
section = "email"
def read_config(self, config, **kwargs):
# TODO: We should separate better the email configuration from the notification
# and account validity config.
self.email_enable_notifs = False
email_config = config.get("email")
if email_config is None:
email_config = {}
self.email_smtp_host = email_config.get("smtp_host", "localhost")
self.email_smtp_port = email_config.get("smtp_port", 25)
self.email_smtp_user = email_config.get("smtp_user", None)
self.email_smtp_pass = email_config.get("smtp_pass", None)
self.require_transport_security = email_config.get(
"require_transport_security", False
)
self.enable_smtp_tls = email_config.get("enable_tls", True)
if self.require_transport_security and not self.enable_smtp_tls:
raise ConfigError(
"email.require_transport_security requires email.enable_tls to be true"
)
if "app_name" in email_config:
self.email_app_name = email_config["app_name"]
else:
self.email_app_name = "Matrix"
# TODO: Rename notif_from to something more generic, or have a separate
# from for password resets, message notifications, etc?
# Currently the email section is a bit bogged down with settings for
# multiple functions. Would be good to split it out into separate
# sections and only put the common ones under email:
self.email_notif_from = email_config.get("notif_from", None)
if self.email_notif_from is not None:
# make sure it's valid
parsed = email.utils.parseaddr(self.email_notif_from)
if parsed[1] == "":
raise RuntimeError("Invalid notif_from address")
# A user-configurable template directory
template_dir = email_config.get("template_dir")
if isinstance(template_dir, str):
# We need an absolute path, because we change directory after starting (and
# we don't yet know what auxiliary templates like mail.css we will need).
template_dir = os.path.abspath(template_dir)
elif template_dir is not None:
# If template_dir is something other than a str or None, warn the user
raise ConfigError("Config option email.template_dir must be type str")
self.email_enable_notifs = email_config.get("enable_notifs", False)
self.threepid_behaviour_email = (
# Have Synapse handle the email sending if account_threepid_delegates.email
# is not defined
# msisdn is currently always remote while Synapse does not support any method of
# sending SMS messages
ThreepidBehaviour.REMOTE
if self.account_threepid_delegate_email
else ThreepidBehaviour.LOCAL
)
# Prior to Synapse v1.4.0, there was another option that defined whether Synapse would
# use an identity server to password reset tokens on its behalf. We now warn the user
# if they have this set and tell them to use the updated option, while using a default
# identity server in the process.
self.using_identity_server_from_trusted_list = False
if (
not self.account_threepid_delegate_email
and config.get("trust_identity_server_for_password_resets", False) is True
):
# Use the first entry in self.trusted_third_party_id_servers instead
if self.trusted_third_party_id_servers:
# XXX: It's a little confusing that account_threepid_delegate_email is modified
# both in RegistrationConfig and here. We should factor this bit out
first_trusted_identity_server = self.trusted_third_party_id_servers[0]
# trusted_third_party_id_servers does not contain a scheme whereas
# account_threepid_delegate_email is expected to. Presume https
self.account_threepid_delegate_email: Optional[str] = (
"https://" + first_trusted_identity_server
)
self.using_identity_server_from_trusted_list = True
else:
raise ConfigError(
"Attempted to use an identity server from"
'"trusted_third_party_id_servers" but it is empty.'
)
self.local_threepid_handling_disabled_due_to_email_config = False
if (
self.threepid_behaviour_email == ThreepidBehaviour.LOCAL
and email_config == {}
):
# We cannot warn the user this has happened here
# Instead do so when a user attempts to reset their password
self.local_threepid_handling_disabled_due_to_email_config = True
self.threepid_behaviour_email = ThreepidBehaviour.OFF
# Get lifetime of a validation token in milliseconds
self.email_validation_token_lifetime = self.parse_duration(
email_config.get("validation_token_lifetime", "1h")
)
if self.threepid_behaviour_email == ThreepidBehaviour.LOCAL:
missing = []
if not self.email_notif_from:
missing.append("email.notif_from")
# public_baseurl is required to build password reset and validation links that
# will be emailed to users
if config.get("public_baseurl") is None:
missing.append("public_baseurl")
if missing:
raise ConfigError(
MISSING_PASSWORD_RESET_CONFIG_ERROR % (", ".join(missing),)
)
# These email templates have placeholders in them, and thus must be
# parsed using a templating engine during a request
password_reset_template_html = email_config.get(
"password_reset_template_html", "password_reset.html"
)
password_reset_template_text = email_config.get(
"password_reset_template_text", "password_reset.txt"
)
registration_template_html = email_config.get(
"registration_template_html", "registration.html"
)
registration_template_text = email_config.get(
"registration_template_text", "registration.txt"
)
add_threepid_template_html = email_config.get(
"add_threepid_template_html", "add_threepid.html"
)
add_threepid_template_text = email_config.get(
"add_threepid_template_text", "add_threepid.txt"
)
password_reset_template_failure_html = email_config.get(
"password_reset_template_failure_html", "password_reset_failure.html"
)
registration_template_failure_html = email_config.get(
"registration_template_failure_html", "registration_failure.html"
)
add_threepid_template_failure_html = email_config.get(
"add_threepid_template_failure_html", "add_threepid_failure.html"
)
# These templates do not support any placeholder variables, so we
# will read them from disk once during setup
password_reset_template_success_html = email_config.get(
"password_reset_template_success_html", "password_reset_success.html"
)
registration_template_success_html = email_config.get(
"registration_template_success_html", "registration_success.html"
)
add_threepid_template_success_html = email_config.get(
"add_threepid_template_success_html", "add_threepid_success.html"
)
# Read all templates from disk
(
self.email_password_reset_template_html,
self.email_password_reset_template_text,
self.email_registration_template_html,
self.email_registration_template_text,
self.email_add_threepid_template_html,
self.email_add_threepid_template_text,
self.email_password_reset_template_confirmation_html,
self.email_password_reset_template_failure_html,
self.email_registration_template_failure_html,
self.email_add_threepid_template_failure_html,
password_reset_template_success_html_template,
registration_template_success_html_template,
add_threepid_template_success_html_template,
) = self.read_templates(
[
password_reset_template_html,
password_reset_template_text,
registration_template_html,
registration_template_text,
add_threepid_template_html,
add_threepid_template_text,
"password_reset_confirmation.html",
password_reset_template_failure_html,
registration_template_failure_html,
add_threepid_template_failure_html,
password_reset_template_success_html,
registration_template_success_html,
add_threepid_template_success_html,
],
template_dir,
)
# Render templates that do not contain any placeholders
self.email_password_reset_template_success_html_content = (
password_reset_template_success_html_template.render()
)
self.email_registration_template_success_html_content = (
registration_template_success_html_template.render()
)
self.email_add_threepid_template_success_html_content = (
add_threepid_template_success_html_template.render()
)
if self.email_enable_notifs:
missing = []
if not self.email_notif_from:
missing.append("email.notif_from")
if config.get("public_baseurl") is None:
missing.append("public_baseurl")
if missing:
raise ConfigError(
"email.enable_notifs is True but required keys are missing: %s"
% (", ".join(missing),)
)
notif_template_html = email_config.get(
"notif_template_html", "notif_mail.html"
)
notif_template_text = email_config.get(
"notif_template_text", "notif_mail.txt"
)
(
self.email_notif_template_html,
self.email_notif_template_text,
) = self.read_templates(
[notif_template_html, notif_template_text],
template_dir,
)
self.email_notif_for_new_users = email_config.get(
"notif_for_new_users", True
)
self.email_riot_base_url = email_config.get(
"client_base_url", email_config.get("riot_base_url", None)
)
if self.account_validity_renew_by_email_enabled:
expiry_template_html = email_config.get(
"expiry_template_html", "notice_expiry.html"
)
expiry_template_text = email_config.get(
"expiry_template_text", "notice_expiry.txt"
)
(
self.account_validity_template_html,
self.account_validity_template_text,
) = self.read_templates(
[expiry_template_html, expiry_template_text],
template_dir,
)
subjects_config = email_config.get("subjects", {})
subjects = {}
for key, default in DEFAULT_SUBJECTS.items():
subjects[key] = subjects_config.get(key, default)
self.email_subjects = EmailSubjectConfig(**subjects)
# The invite client location should be a HTTP(S) URL or None.
self.invite_client_location = email_config.get("invite_client_location") or None
if self.invite_client_location:
if not isinstance(self.invite_client_location, str):
raise ConfigError(
"Config option email.invite_client_location must be type str"
)
if not (
self.invite_client_location.startswith("http://")
or self.invite_client_location.startswith("https://")
):
raise ConfigError(
"Config option email.invite_client_location must be a http or https URL",
path=("email", "invite_client_location"),
)
def generate_config_section(self, config_dir_path, server_name, **kwargs):
return (
"""\
# Configuration for sending emails from Synapse.
#
email:
# The hostname of the outgoing SMTP server to use. Defaults to 'localhost'.
#
#smtp_host: mail.server
# The port on the mail server for outgoing SMTP. Defaults to 25.
#
#smtp_port: 587
# Username/password for authentication to the SMTP server. By default, no
# authentication is attempted.
#
#smtp_user: "exampleusername"
#smtp_pass: "examplepassword"
# Uncomment the following to require TLS transport security for SMTP.
# By default, Synapse will connect over plain text, and will then switch to
# TLS via STARTTLS *if the SMTP server supports it*. If this option is set,
# Synapse will refuse to connect unless the server supports STARTTLS.
#
#require_transport_security: true
# Uncomment the following to disable TLS for SMTP.
#
# By default, if the server supports TLS, it will be used, and the server
# must present a certificate that is valid for 'smtp_host'. If this option
# is set to false, TLS will not be used.
#
#enable_tls: false
# notif_from defines the "From" address to use when sending emails.
# It must be set if email sending is enabled.
#
# The placeholder '%%(app)s' will be replaced by the application name,
# which is normally 'app_name' (below), but may be overridden by the
# Matrix client application.
#
# Note that the placeholder must be written '%%(app)s', including the
# trailing 's'.
#
#notif_from: "Your Friendly %%(app)s homeserver <noreply@example.com>"
# app_name defines the default value for '%%(app)s' in notif_from and email
# subjects. It defaults to 'Matrix'.
#
#app_name: my_branded_matrix_server
# Uncomment the following to enable sending emails for messages that the user
# has missed. Disabled by default.
#
#enable_notifs: true
# Uncomment the following to disable automatic subscription to email
# notifications for new users. Enabled by default.
#
#notif_for_new_users: false
# Custom URL for client links within the email notifications. By default
# links will be based on "https://matrix.to".
#
# (This setting used to be called riot_base_url; the old name is still
# supported for backwards-compatibility but is now deprecated.)
#
#client_base_url: "http://localhost/riot"
# Configure the time that a validation email will expire after sending.
# Defaults to 1h.
#
#validation_token_lifetime: 15m
# The web client location to direct users to during an invite. This is passed
# to the identity server as the org.matrix.web_client_location key. Defaults
# to unset, giving no guidance to the identity server.
#
#invite_client_location: https://app.element.io
# Directory in which Synapse will try to find the template files below.
# If not set, or the files named below are not found within the template
# directory, default templates from within the Synapse package will be used.
#
# Synapse will look for the following templates in this directory:
#
# * The contents of email notifications of missed events: 'notif_mail.html' and
# 'notif_mail.txt'.
#
# * The contents of account expiry notice emails: 'notice_expiry.html' and
# 'notice_expiry.txt'.
#
# * The contents of password reset emails sent by the homeserver:
# 'password_reset.html' and 'password_reset.txt'
#
# * An HTML page that a user will see when they follow the link in the password
# reset email. The user will be asked to confirm the action before their
# password is reset: 'password_reset_confirmation.html'
#
# * HTML pages for success and failure that a user will see when they confirm
# the password reset flow using the page above: 'password_reset_success.html'
# and 'password_reset_failure.html'
#
# * The contents of address verification emails sent during registration:
# 'registration.html' and 'registration.txt'
#
# * HTML pages for success and failure that a user will see when they follow
# the link in an address verification email sent during registration:
# 'registration_success.html' and 'registration_failure.html'
#
# * The contents of address verification emails sent when an address is added
# to a Matrix account: 'add_threepid.html' and 'add_threepid.txt'
#
# * HTML pages for success and failure that a user will see when they follow
# the link in an address verification email sent when an address is added
# to a Matrix account: 'add_threepid_success.html' and
# 'add_threepid_failure.html'
#
# You can see the default templates at:
# https://github.com/matrix-org/synapse/tree/master/synapse/res/templates
#
#template_dir: "res/templates"
# Subjects to use when sending emails from Synapse.
#
# The placeholder '%%(app)s' will be replaced with the value of the 'app_name'
# setting above, or by a value dictated by the Matrix client application.
#
# If a subject isn't overridden in this configuration file, the value used as
# its example will be used.
#
#subjects:
# Subjects for notification emails.
#
# On top of the '%%(app)s' placeholder, these can use the following
# placeholders:
#
# * '%%(person)s', which will be replaced by the display name of the user(s)
# that sent the message(s), e.g. "Alice and Bob".
# * '%%(room)s', which will be replaced by the name of the room the
# message(s) have been sent to, e.g. "My super room".
#
# See the example provided for each setting to see which placeholder can be
# used and how to use them.
#
# Subject to use to notify about one message from one or more user(s) in a
# room which has a name.
#message_from_person_in_room: "%(message_from_person_in_room)s"
#
# Subject to use to notify about one message from one or more user(s) in a
# room which doesn't have a name.
#message_from_person: "%(message_from_person)s"
#
# Subject to use to notify about multiple messages from one or more users in
# a room which doesn't have a name.
#messages_from_person: "%(messages_from_person)s"
#
# Subject to use to notify about multiple messages in a room which has a
# name.
#messages_in_room: "%(messages_in_room)s"
#
# Subject to use to notify about multiple messages in multiple rooms.
#messages_in_room_and_others: "%(messages_in_room_and_others)s"
#
# Subject to use to notify about multiple messages from multiple persons in
# multiple rooms. This is similar to the setting above except it's used when
# the room in which the notification was triggered has no name.
#messages_from_person_and_others: "%(messages_from_person_and_others)s"
#
# Subject to use to notify about an invite to a room which has a name.
#invite_from_person_to_room: "%(invite_from_person_to_room)s"
#
# Subject to use to notify about an invite to a room which doesn't have a
# name.
#invite_from_person: "%(invite_from_person)s"
# Subject for emails related to account administration.
#
# On top of the '%%(app)s' placeholder, these one can use the
# '%%(server_name)s' placeholder, which will be replaced by the value of the
# 'server_name' setting in your Synapse configuration.
#
# Subject to use when sending a password reset email.
#password_reset: "%(password_reset)s"
#
# Subject to use when sending a verification email to assert an address's
# ownership.
#email_validation: "%(email_validation)s"
"""
% DEFAULT_SUBJECTS
)
class ThreepidBehaviour(Enum):
"""
Enum to define the behaviour of Synapse with regards to when it contacts an identity
server for 3pid registration and password resets
REMOTE = use an external server to send tokens
LOCAL = send tokens ourselves
OFF = disable registration via 3pid and password resets
"""
REMOTE = "remote"
LOCAL = "local"
OFF = "off"
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