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Remove support for ACME v1 (#10194)

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Fixes #9778

ACME v1 has been fully decommissioned for existing installs on June 1st 2021(see https://community.letsencrypt.org/t/end-of-life-plan-for-acmev1/88430/27), so we can now safely remove it from Synapse.
This commit is contained in:
Brendan Abolivier 2021-06-17 19:56:48 +02:00 committed by GitHub
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5
INSTALL.md
View file

@ -442,10 +442,7 @@ so, you will need to edit `homeserver.yaml`, as follows:
- You will also need to uncomment the `tls_certificate_path` and
`tls_private_key_path` lines under the `TLS` section. You will need to manage
provisioning of these certificates yourself — Synapse had built-in ACME
support, but the ACMEv1 protocol Synapse implements is deprecated, not
allowed by LetsEncrypt for new sites, and will break for existing sites in
late 2020. See [ACME.md](docs/ACME.md).
provisioning of these certificates yourself.
If you are using your own certificate, be sure to use a `.pem` file that
includes the full certificate chain including any intermediate certificates

7
README.rst
View file

@ -142,13 +142,6 @@ the form of::
As when logging in, you will need to specify a "Custom server". Specify your
desired ``localpart`` in the 'User name' box.
ACME setup
==========
For details on having Synapse manage your federation TLS certificates
automatically, please see `<docs/ACME.md>`_.
Security note
=============

1
changelog.d/10194.removal Normal file
View file

@ -0,0 +1 @@
Remove Synapse's support for automatically fetching and renewing certificates using the ACME v1 protocol. This protocol has been fully turned off by Let's Encrypt for existing install on June 1st 2021. Admins previously using this feature should use a [reverse proxy](https://matrix-org.github.io/synapse/develop/reverse_proxy.html) to handle TLS termination, or use an external ACME client (such as [certbot](https://certbot.eff.org/)) to retrieve a certificate and key and provide them to Synapse using the `tls_certificate_path` and `tls_private_key_path` configuration settings.

6
docker/conf/homeserver.yaml
View file

@ -7,12 +7,6 @@
tls_certificate_path: "/data/{{ SYNAPSE_SERVER_NAME }}.tls.crt"
tls_private_key_path: "/data/{{ SYNAPSE_SERVER_NAME }}.tls.key"
{% if SYNAPSE_ACME %}
acme:
enabled: true
port: 8009
{% endif %}
{% endif %}
## Server ##

161
docs/ACME.md
View file

@ -1,161 +0,0 @@
# ACME
From version 1.0 (June 2019) onwards, Synapse requires valid TLS
certificates for communication between servers (by default on port
`8448`) in addition to those that are client-facing (port `443`). To
help homeserver admins fulfil this new requirement, Synapse v0.99.0
introduced support for automatically provisioning certificates through
[Let's Encrypt](https://letsencrypt.org/) using the ACME protocol.
## Deprecation of ACME v1
In [March 2019](https://community.letsencrypt.org/t/end-of-life-plan-for-acmev1/88430),
Let's Encrypt announced that they were deprecating version 1 of the ACME
protocol, with the plan to disable the use of it for new accounts in
November 2019, for new domains in June 2020, and for existing accounts and
domains in June 2021.
Synapse doesn't currently support version 2 of the ACME protocol, which
means that:
* for existing installs, Synapse's built-in ACME support will continue
to work until June 2021.
* for new installs, this feature will not work at all.
Either way, it is recommended to move from Synapse's ACME support
feature to an external automated tool such as [certbot](https://github.com/certbot/certbot)
(or browse [this list](https://letsencrypt.org/fr/docs/client-options/)
for an alternative ACME client).
It's also recommended to use a reverse proxy for the server-facing
communications (more documentation about this can be found
[here](/docs/reverse_proxy.md)) as well as the client-facing ones and
have it serve the certificates.
In case you can't do that and need Synapse to serve them itself, make
sure to set the `tls_certificate_path` configuration setting to the path
of the certificate (make sure to use the certificate containing the full
certification chain, e.g. `fullchain.pem` if using certbot) and
`tls_private_key_path` to the path of the matching private key. Note
that in this case you will need to restart Synapse after each
certificate renewal so that Synapse stops using the old certificate.
If you still want to use Synapse's built-in ACME support, the rest of
this document explains how to set it up.
## Initial setup
In the case that your `server_name` config variable is the same as
the hostname that the client connects to, then the same certificate can be
used between client and federation ports without issue.
If your configuration file does not already have an `acme` section, you can
generate an example config by running the `generate_config` executable. For
example:
```
~/synapse/env3/bin/generate_config
```
You will need to provide Let's Encrypt (or another ACME provider) access to
your Synapse ACME challenge responder on port 80, at the domain of your
homeserver. This requires you to either change the port of the ACME listener
provided by Synapse to a high port and reverse proxy to it, or use a tool
like `authbind` to allow Synapse to listen on port 80 without root access.
(Do not run Synapse with root permissions!) Detailed instructions are
available under "ACME setup" below.
If you already have certificates, you will need to back up or delete them
(files `example.com.tls.crt` and `example.com.tls.key` in Synapse's root
directory), Synapse's ACME implementation will not overwrite them.
## ACME setup
The main steps for enabling ACME support in short summary are:
1. Allow Synapse to listen for incoming ACME challenges.
1. Enable ACME support in `homeserver.yaml`.
1. Move your old certificates (files `example.com.tls.crt` and `example.com.tls.key` out of the way if they currently exist at the paths specified in `homeserver.yaml`.
1. Restart Synapse.
Detailed instructions for each step are provided below.
### Listening on port 80
In order for Synapse to complete the ACME challenge to provision a
certificate, it needs access to port 80. Typically listening on port 80 is
only granted to applications running as root. There are thus two solutions to
this problem.
#### Using a reverse proxy
A reverse proxy such as Apache or nginx allows a single process (the web
server) to listen on port 80 and proxy traffic to the appropriate program
running on your server. It is the recommended method for setting up ACME as
it allows you to use your existing webserver while also allowing Synapse to
provision certificates as needed.
For nginx users, add the following line to your existing `server` block:
```
location /.well-known/acme-challenge {
proxy_pass http://localhost:8009;
}
```
For Apache, add the following to your existing webserver config:
```
ProxyPass /.well-known/acme-challenge http://localhost:8009/.well-known/acme-challenge
```
Make sure to restart/reload your webserver after making changes.
Now make the relevant changes in `homeserver.yaml` to enable ACME support:
```
acme:
enabled: true
port: 8009
```
#### Authbind
`authbind` allows a program which does not run as root to bind to
low-numbered ports in a controlled way. The setup is simpler, but requires a
webserver not to already be running on port 80. **This includes every time
Synapse renews a certificate**, which may be cumbersome if you usually run a
web server on port 80. Nevertheless, if you're sure port 80 is not being used
for any other purpose then all that is necessary is the following:
Install `authbind`. For example, on Debian/Ubuntu:
```
sudo apt-get install authbind
```
Allow `authbind` to bind port 80:
```
sudo touch /etc/authbind/byport/80
sudo chmod 777 /etc/authbind/byport/80
```
When Synapse is started, use the following syntax:
```
authbind --deep <synapse start command>
```
Make the relevant changes in `homeserver.yaml` to enable ACME support:
```
acme:
enabled: true
```
### (Re)starting synapse
Ensure that the certificate paths specified in `homeserver.yaml` (`tls_certificate_path` and `tls_private_key_path`) do not currently point to any files. Synapse will not provision certificates if files exist, as it does not want to overwrite existing certificates.
Finally, start/restart Synapse.

28
docs/MSC1711_certificates_FAQ.md
View file

@ -101,15 +101,6 @@ In this case, your `server_name` points to the host where your Synapse is
running. There is no need to create a `.well-known` URI or an SRV record, but
you will need to give Synapse a valid, signed, certificate.
The easiest way to do that is with Synapse's built-in ACME (Let's Encrypt)
support. Full details are in [ACME.md](./ACME.md) but, in a nutshell:
1. Allow Synapse to listen on port 80 with `authbind`, or forward it from a
reverse proxy.
2. Enable acme support in `homeserver.yaml`.
3. Move your old certificates out of the way.
4. Restart Synapse.
### If you do have an SRV record currently
If you are using an SRV record, your matrix domain (`server_name`) may not
@ -130,15 +121,9 @@ In this situation, you have three choices for how to proceed:
#### Option 1: give Synapse a certificate for your matrix domain
Synapse 1.0 will expect your server to present a TLS certificate for your
`server_name` (`example.com` in the above example). You can achieve this by
doing one of the following:
* Acquire a certificate for the `server_name` yourself (for example, using
`certbot`), and give it and the key to Synapse via `tls_certificate_path`
and `tls_private_key_path`, or:
* Use Synapse's [ACME support](./ACME.md), and forward port 80 on the
`server_name` domain to your Synapse instance.
`server_name` (`example.com` in the above example). You can achieve this by acquiring a
certificate for the `server_name` yourself (for example, using `certbot`), and giving it
and the key to Synapse via `tls_certificate_path` and `tls_private_key_path`.
#### Option 2: run Synapse behind a reverse proxy
@ -161,10 +146,9 @@ You can do this with a `.well-known` file as follows:
with Synapse 0.34 and earlier.
2. Give Synapse a certificate corresponding to the target domain
(`customer.example.net` in the above example). You can either use Synapse's
built-in [ACME support](./ACME.md) for this (via the `domain` parameter in
the `acme` section), or acquire a certificate yourself and give it to
Synapse via `tls_certificate_path` and `tls_private_key_path`.
(`customer.example.net` in the above example). You can do this by acquire a
certificate for the target domain and giving it to Synapse via `tls_certificate_path`
and `tls_private_key_path`.
3. Restart Synapse to ensure the new certificate is loaded.

84
docs/sample_config.yaml
View file

@ -552,13 +552,9 @@ retention:
# This certificate, as of Synapse 1.0, will need to be a valid and verifiable
# certificate, signed by a recognised Certificate Authority.
#
# See 'ACME support' below to enable auto-provisioning this certificate via
# Let's Encrypt.
#
# If supplying your own, be sure to use a `.pem` file that includes the
# full certificate chain including any intermediate certificates (for
# instance, if using certbot, use `fullchain.pem` as your certificate,
# not `cert.pem`).
# Be sure to use a `.pem` file that includes the full certificate chain including
# any intermediate certificates (for instance, if using certbot, use
# `fullchain.pem` as your certificate, not `cert.pem`).
#
#tls_certificate_path: "CONFDIR/SERVERNAME.tls.crt"
@ -609,80 +605,6 @@ retention:
# - myCA2.pem
# - myCA3.pem
# ACME support: This will configure Synapse to request a valid TLS certificate
# for your configured `server_name` via Let's Encrypt.
#
# Note that ACME v1 is now deprecated, and Synapse currently doesn't support
# ACME v2. This means that this feature currently won't work with installs set
# up after November 2019. For more info, and alternative solutions, see
# https://github.com/matrix-org/synapse/blob/master/docs/ACME.md#deprecation-of-acme-v1
#
# Note that provisioning a certificate in this way requires port 80 to be
# routed to Synapse so that it can complete the http-01 ACME challenge.
# By default, if you enable ACME support, Synapse will attempt to listen on
# port 80 for incoming http-01 challenges - however, this will likely fail
# with 'Permission denied' or a similar error.
#
# There are a couple of potential solutions to this:
#
# * If you already have an Apache, Nginx, or similar listening on port 80,
# you can configure Synapse to use an alternate port, and have your web
# server forward the requests. For example, assuming you set 'port: 8009'
# below, on Apache, you would write:
#
# ProxyPass /.well-known/acme-challenge http://localhost:8009/.well-known/acme-challenge
#
# * Alternatively, you can use something like `authbind` to give Synapse
# permission to listen on port 80.
#
acme:
# ACME support is disabled by default. Set this to `true` and uncomment
# tls_certificate_path and tls_private_key_path above to enable it.
#
enabled: false
# Endpoint to use to request certificates. If you only want to test,
# use Let's Encrypt's staging url:
# https://acme-staging.api.letsencrypt.org/directory
#
#url: https://acme-v01.api.letsencrypt.org/directory
# Port number to listen on for the HTTP-01 challenge. Change this if
# you are forwarding connections through Apache/Nginx/etc.
#
port: 80
# Local addresses to listen on for incoming connections.
# Again, you may want to change this if you are forwarding connections
# through Apache/Nginx/etc.
#
bind_addresses: ['::', '0.0.0.0']
# How many days remaining on a certificate before it is renewed.
#
reprovision_threshold: 30
# The domain that the certificate should be for. Normally this
# should be the same as your Matrix domain (i.e., 'server_name'), but,
# by putting a file at 'https://<server_name>/.well-known/matrix/server',
# you can delegate incoming traffic to another server. If you do that,
# you should give the target of the delegation here.
#
# For example: if your 'server_name' is 'example.com', but
# 'https://example.com/.well-known/matrix/server' delegates to
# 'matrix.example.com', you should put 'matrix.example.com' here.
#
# If not set, defaults to your 'server_name'.
#
domain: matrix.example.com
# file to use for the account key. This will be generated if it doesn't
# exist.
#
# If unspecified, we will use CONFDIR/client.key.
#
account_key_file: DATADIR/acme_account.key
## Federation ##

3
mypy.ini
View file

@ -176,9 +176,6 @@ ignore_missing_imports = True
[mypy-josepy.*]
ignore_missing_imports = True
[mypy-txacme.*]
ignore_missing_imports = True
[mypy-pympler.*]
ignore_missing_imports = True

3
synapse/app/_base.py
View file

@ -289,8 +289,7 @@ async def start(hs: "synapse.server.HomeServer"):
"""
Start a Synapse server or worker.
Should be called once the reactor is running and (if we're using ACME) the
TLS certificates are in place.
Should be called once the reactor is running.
Will start the main HTTP listeners and do some other startup tasks, and then
notify systemd.

48
synapse/app/homeserver.py
View file

@ -363,55 +363,7 @@ def setup(config_options):
except UpgradeDatabaseException as e:
quit_with_error("Failed to upgrade database: %s" % (e,))
async def do_acme() -> bool:
"""
Reprovision an ACME certificate, if it's required.
Returns:
Whether the cert has been updated.
"""
acme = hs.get_acme_handler()
# Check how long the certificate is active for.
cert_days_remaining = hs.config.is_disk_cert_valid(allow_self_signed=False)
# We want to reprovision if cert_days_remaining is None (meaning no
# certificate exists), or the days remaining number it returns
# is less than our re-registration threshold.
provision = False
if (
cert_days_remaining is None
or cert_days_remaining < hs.config.acme_reprovision_threshold
):
provision = True
if provision:
await acme.provision_certificate()
return provision
async def reprovision_acme():
"""
Provision a certificate from ACME, if required, and reload the TLS
certificate if it's renewed.
"""
reprovisioned = await do_acme()
if reprovisioned:
_base.refresh_certificate(hs)
async def start():
# Run the ACME provisioning code, if it's enabled.
if hs.config.acme_enabled:
acme = hs.get_acme_handler()
# Start up the webservices which we will respond to ACME
# challenges with, and then provision.
await acme.start_listening()
await do_acme()
# Check if it needs to be reprovisioned every day.
hs.get_clock().looping_call(reprovision_acme, 24 * 60 * 60 * 1000)
# Load the OIDC provider metadatas, if OIDC is enabled.
if hs.config.oidc_enabled:
oidc = hs.get_oidc_handler()

5
synapse/config/_base.py
View file

@ -405,7 +405,6 @@ class RootConfig:
listeners=None,
tls_certificate_path=None,
tls_private_key_path=None,
acme_domain=None,
):
"""
Build a default configuration file
@ -457,9 +456,6 @@ class RootConfig:
tls_private_key_path (str|None): The path to the tls private key.
acme_domain (str|None): The domain acme will try to validate. If
specified acme will be enabled.
Returns:
str: the yaml config file
"""
@ -477,7 +473,6 @@ class RootConfig:
listeners=listeners,
tls_certificate_path=tls_certificate_path,
tls_private_key_path=tls_private_key_path,
acme_domain=acme_domain,
).values()
)

1
synapse/config/_base.pyi
View file

@ -111,7 +111,6 @@ class RootConfig:
database_conf: Optional[Any] = ...,
tls_certificate_path: Optional[str] = ...,
tls_private_key_path: Optional[str] = ...,
acme_domain: Optional[str] = ...,
): ...
@classmethod
def load_or_generate_config(cls, description: Any, argv: Any): ...

151
synapse/config/tls.py
View file

@ -14,7 +14,6 @@
import logging
import os
import warnings
from datetime import datetime
from typing import List, Optional, Pattern
@ -26,45 +25,12 @@ from synapse.util import glob_to_regex
logger = logging.getLogger(__name__)
ACME_SUPPORT_ENABLED_WARN = """\
This server uses Synapse's built-in ACME support. Note that ACME v1 has been
deprecated by Let's Encrypt, and that Synapse doesn't currently support ACME v2,
which means that this feature will not work with Synapse installs set up after
November 2019, and that it may stop working on June 2020 for installs set up
before that date.
For more info and alternative solutions, see
https://github.com/matrix-org/synapse/blob/master/docs/ACME.md#deprecation-of-acme-v1
--------------------------------------------------------------------------------"""
class TlsConfig(Config):
section = "tls"
def read_config(self, config: dict, config_dir_path: str, **kwargs):
acme_config = config.get("acme", None)
if acme_config is None:
acme_config = {}
self.acme_enabled = acme_config.get("enabled", False)
if self.acme_enabled:
logger.warning(ACME_SUPPORT_ENABLED_WARN)
# hyperlink complains on py2 if this is not a Unicode
self.acme_url = str(
acme_config.get("url", "https://acme-v01.api.letsencrypt.org/directory")
)
self.acme_port = acme_config.get("port", 80)
self.acme_bind_addresses = acme_config.get("bind_addresses", ["::", "0.0.0.0"])
self.acme_reprovision_threshold = acme_config.get("reprovision_threshold", 30)
self.acme_domain = acme_config.get("domain", config.get("server_name"))
self.acme_account_key_file = self.abspath(
acme_config.get("account_key_file", config_dir_path + "/client.key")
)
self.tls_certificate_file = self.abspath(config.get("tls_certificate_path"))
self.tls_private_key_file = self.abspath(config.get("tls_private_key_path"))
@ -229,11 +195,9 @@ class TlsConfig(Config):
data_dir_path,
tls_certificate_path,
tls_private_key_path,
acme_domain,
**kwargs,
):
"""If the acme_domain is specified acme will be enabled.
If the TLS paths are not specified the default will be certs in the
"""If the TLS paths are not specified the default will be certs in the
config directory"""
base_key_name = os.path.join(config_dir_path, server_name)
@ -243,28 +207,15 @@ class TlsConfig(Config):
"Please specify both a cert path and a key path or neither."
)
tls_enabled = (
"" if tls_certificate_path and tls_private_key_path or acme_domain else "#"
)
tls_enabled = "" if tls_certificate_path and tls_private_key_path else "#"
if not tls_certificate_path:
tls_certificate_path = base_key_name + ".tls.crt"
if not tls_private_key_path:
tls_private_key_path = base_key_name + ".tls.key"
acme_enabled = bool(acme_domain)
acme_domain = "matrix.example.com"
default_acme_account_file = os.path.join(data_dir_path, "acme_account.key")
# this is to avoid the max line length. Sorrynotsorry
proxypassline = (
"ProxyPass /.well-known/acme-challenge "
"http://localhost:8009/.well-known/acme-challenge"
)
# flake8 doesn't recognise that variables are used in the below string
_ = tls_enabled, proxypassline, acme_enabled, default_acme_account_file
_ = tls_enabled
return (
"""\
@ -274,13 +225,9 @@ class TlsConfig(Config):
# This certificate, as of Synapse 1.0, will need to be a valid and verifiable
# certificate, signed by a recognised Certificate Authority.
#
# See 'ACME support' below to enable auto-provisioning this certificate via
# Let's Encrypt.
#
# If supplying your own, be sure to use a `.pem` file that includes the
# full certificate chain including any intermediate certificates (for
# instance, if using certbot, use `fullchain.pem` as your certificate,
# not `cert.pem`).
# Be sure to use a `.pem` file that includes the full certificate chain including
# any intermediate certificates (for instance, if using certbot, use
# `fullchain.pem` as your certificate, not `cert.pem`).
#
%(tls_enabled)stls_certificate_path: "%(tls_certificate_path)s"
@ -330,80 +277,6 @@ class TlsConfig(Config):
# - myCA1.pem
# - myCA2.pem
# - myCA3.pem
# ACME support: This will configure Synapse to request a valid TLS certificate
# for your configured `server_name` via Let's Encrypt.
#
# Note that ACME v1 is now deprecated, and Synapse currently doesn't support
# ACME v2. This means that this feature currently won't work with installs set
# up after November 2019. For more info, and alternative solutions, see
# https://github.com/matrix-org/synapse/blob/master/docs/ACME.md#deprecation-of-acme-v1
#
# Note that provisioning a certificate in this way requires port 80 to be
# routed to Synapse so that it can complete the http-01 ACME challenge.
# By default, if you enable ACME support, Synapse will attempt to listen on
# port 80 for incoming http-01 challenges - however, this will likely fail
# with 'Permission denied' or a similar error.
#
# There are a couple of potential solutions to this:
#
# * If you already have an Apache, Nginx, or similar listening on port 80,
# you can configure Synapse to use an alternate port, and have your web
# server forward the requests. For example, assuming you set 'port: 8009'
# below, on Apache, you would write:
#
# %(proxypassline)s
#
# * Alternatively, you can use something like `authbind` to give Synapse
# permission to listen on port 80.
#
acme:
# ACME support is disabled by default. Set this to `true` and uncomment
# tls_certificate_path and tls_private_key_path above to enable it.
#
enabled: %(acme_enabled)s
# Endpoint to use to request certificates. If you only want to test,
# use Let's Encrypt's staging url:
# https://acme-staging.api.letsencrypt.org/directory
#
#url: https://acme-v01.api.letsencrypt.org/directory
# Port number to listen on for the HTTP-01 challenge. Change this if
# you are forwarding connections through Apache/Nginx/etc.
#
port: 80
# Local addresses to listen on for incoming connections.
# Again, you may want to change this if you are forwarding connections
# through Apache/Nginx/etc.
#
bind_addresses: ['::', '0.0.0.0']
# How many days remaining on a certificate before it is renewed.
#
reprovision_threshold: 30
# The domain that the certificate should be for. Normally this
# should be the same as your Matrix domain (i.e., 'server_name'), but,
# by putting a file at 'https://<server_name>/.well-known/matrix/server',
# you can delegate incoming traffic to another server. If you do that,
# you should give the target of the delegation here.
#
# For example: if your 'server_name' is 'example.com', but
# 'https://example.com/.well-known/matrix/server' delegates to
# 'matrix.example.com', you should put 'matrix.example.com' here.
#
# If not set, defaults to your 'server_name'.
#
domain: %(acme_domain)s
# file to use for the account key. This will be generated if it doesn't
# exist.
#
# If unspecified, we will use CONFDIR/client.key.
#
account_key_file: %(default_acme_account_file)s
"""
# Lowercase the string representation of boolean values
% {
@ -415,8 +288,6 @@ class TlsConfig(Config):
def read_tls_certificate(self) -> crypto.X509:
"""Reads the TLS certificate from the configured file, and returns it
Also checks if it is self-signed, and warns if so
Returns:
The certificate
"""
@ -425,16 +296,6 @@ class TlsConfig(Config):
cert_pem = self.read_file(cert_path, "tls_certificate_path")
cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_pem)
# Check if it is self-signed, and issue a warning if so.
if cert.get_issuer() == cert.get_subject():
warnings.warn(
(
"Self-signed TLS certificates will not be accepted by Synapse 1.0. "
"Please either provide a valid certificate, or use Synapse's ACME "
"support to provision one."
)
)
return cert
def read_tls_private_key(self) -> crypto.PKey:

117
synapse/handlers/acme.py
View file

@ -1,117 +0,0 @@
# Copyright 2019 New Vector Ltd
#
# 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 logging
from typing import TYPE_CHECKING
import twisted
import twisted.internet.error
from twisted.web import server, static
from twisted.web.resource import Resource
from synapse.app import check_bind_error
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
ACME_REGISTER_FAIL_ERROR = """
--------------------------------------------------------------------------------
Failed to register with the ACME provider. This is likely happening because the installation
is new, and ACME v1 has been deprecated by Let's Encrypt and disabled for
new installations since November 2019.
At the moment, Synapse doesn't support ACME v2. For more information and alternative
solutions, please read https://github.com/matrix-org/synapse/blob/master/docs/ACME.md#deprecation-of-acme-v1
--------------------------------------------------------------------------------"""
class AcmeHandler:
def __init__(self, hs: "HomeServer"):
self.hs = hs
self.reactor = hs.get_reactor()
self._acme_domain = hs.config.acme_domain
async def start_listening(self) -> None:
from synapse.handlers import acme_issuing_service
# Configure logging for txacme, if you need to debug
# from eliot import add_destinations
# from eliot.twisted import TwistedDestination
#
# add_destinations(TwistedDestination())
well_known = Resource()
self._issuer = acme_issuing_service.create_issuing_service(
self.reactor,
acme_url=self.hs.config.acme_url,
account_key_file=self.hs.config.acme_account_key_file,
well_known_resource=well_known,
)
responder_resource = Resource()
responder_resource.putChild(b".well-known", well_known)
responder_resource.putChild(b"check", static.Data(b"OK", b"text/plain"))
srv = server.Site(responder_resource)
bind_addresses = self.hs.config.acme_bind_addresses
for host in bind_addresses:
logger.info(
"Listening for ACME requests on %s:%i", host, self.hs.config.acme_port
)
try:
self.reactor.listenTCP(
self.hs.config.acme_port, srv, backlog=50, interface=host
)
except twisted.internet.error.CannotListenError as e:
check_bind_error(e, host, bind_addresses)
# Make sure we are registered to the ACME server. There's no public API
# for this, it is usually triggered by startService, but since we don't
# want it to control where we save the certificates, we have to reach in
# and trigger the registration machinery ourselves.
self._issuer._registered = False
try:
await self._issuer._ensure_registered()
except Exception:
logger.error(ACME_REGISTER_FAIL_ERROR)
raise
async def provision_certificate(self) -> None:
logger.warning("Reprovisioning %s", self._acme_domain)
try:
await self._issuer.issue_cert(self._acme_domain)
except Exception:
logger.exception("Fail!")
raise
logger.warning("Reprovisioned %s, saving.", self._acme_domain)
cert_chain = self._issuer.cert_store.certs[self._acme_domain]
try:
with open(self.hs.config.tls_private_key_file, "wb") as private_key_file:
for x in cert_chain:
if x.startswith(b"-----BEGIN RSA PRIVATE KEY-----"):
private_key_file.write(x)
with open(self.hs.config.tls_certificate_file, "wb") as certificate_file:
for x in cert_chain:
if x.startswith(b"-----BEGIN CERTIFICATE-----"):
certificate_file.write(x)
except Exception:
logger.exception("Failed saving!")
raise

127
synapse/handlers/acme_issuing_service.py
View file

@ -1,127 +0,0 @@
# Copyright 2019 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.
"""
Utility function to create an ACME issuing service.
This file contains the unconditional imports on the acme and cryptography bits that we
only need (and may only have available) if we are doing ACME, so is designed to be
imported conditionally.
"""
import logging
from typing import Dict, Iterable, List
import attr
import pem
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from josepy import JWKRSA
from josepy.jwa import RS256
from txacme.challenges import HTTP01Responder
from txacme.client import Client
from txacme.interfaces import ICertificateStore
from txacme.service import AcmeIssuingService
from txacme.util import generate_private_key
from zope.interface import implementer
from twisted.internet import defer
from twisted.internet.interfaces import IReactorTCP
from twisted.python.filepath import FilePath
from twisted.python.url import URL
from twisted.web.resource import IResource
logger = logging.getLogger(__name__)
def create_issuing_service(
reactor: IReactorTCP,
acme_url: str,
account_key_file: str,
well_known_resource: IResource,
) -> AcmeIssuingService:
"""Create an ACME issuing service, and attach it to a web Resource
Args:
reactor: twisted reactor
acme_url: URL to use to request certificates
account_key_file: where to store the account key
well_known_resource: web resource for .well-known.
we will attach a child resource for "acme-challenge".
Returns:
AcmeIssuingService
"""
responder = HTTP01Responder()
well_known_resource.putChild(b"acme-challenge", responder.resource)
store = ErsatzStore()
return AcmeIssuingService(
cert_store=store,
client_creator=(
lambda: Client.from_url(
reactor=reactor,
url=URL.from_text(acme_url),
key=load_or_create_client_key(account_key_file),
alg=RS256,
)
),
clock=reactor,
responders=[responder],
)
@attr.s(slots=True)
@implementer(ICertificateStore)
class ErsatzStore:
"""
A store that only stores in memory.
"""
certs = attr.ib(type=Dict[bytes, List[bytes]], default=attr.Factory(dict))
def store(
self, server_name: bytes, pem_objects: Iterable[pem.AbstractPEMObject]
) -> defer.Deferred:
self.certs[server_name] = [o.as_bytes() for o in pem_objects]
return defer.succeed(None)
def load_or_create_client_key(key_file: str) -> JWKRSA:
"""Load the ACME account key from a file, creating it if it does not exist.
Args:
key_file: name of the file to use as the account key
"""
# this is based on txacme.endpoint.load_or_create_client_key, but doesn't
# hardcode the 'client.key' filename
acme_key_file = FilePath(key_file)
if acme_key_file.exists():
logger.info("Loading ACME account key from '%s'", acme_key_file)
key = serialization.load_pem_private_key(
acme_key_file.getContent(), password=None, backend=default_backend()
)
else:
logger.info("Saving new ACME account key to '%s'", acme_key_file)
key = generate_private_key("rsa")
acme_key_file.setContent(
key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.NoEncryption(),
)
)
return JWKRSA(key=key)

5
synapse/python_dependencies.py
View file

@ -96,11 +96,6 @@ CONDITIONAL_REQUIREMENTS = {
"psycopg2cffi>=2.8 ; platform_python_implementation == 'PyPy'",
"psycopg2cffi-compat==1.1 ; platform_python_implementation == 'PyPy'",
],
# ACME support is required to provision TLS certificates from authorities
# that use the protocol, such as Let's Encrypt.
"acme": [
"txacme>=0.9.2",
],
"saml2": [
"pysaml2>=4.5.0",
],

5
synapse/server.py
View file

@ -66,7 +66,6 @@ from synapse.groups.attestations import GroupAttestationSigning, GroupAttestionR
from synapse.groups.groups_server import GroupsServerHandler, GroupsServerWorkerHandler
from synapse.handlers.account_data import AccountDataHandler
from synapse.handlers.account_validity import AccountValidityHandler
from synapse.handlers.acme import AcmeHandler
from synapse.handlers.admin import AdminHandler
from synapse.handlers.appservice import ApplicationServicesHandler
from synapse.handlers.auth import AuthHandler, MacaroonGenerator
@ -494,10 +493,6 @@ class HomeServer(metaclass=abc.ABCMeta):
def get_e2e_room_keys_handler(self) -> E2eRoomKeysHandler:
return E2eRoomKeysHandler(self)
@cache_in_self
def get_acme_handler(self) -> AcmeHandler:
return AcmeHandler(self)
@cache_in_self
def get_admin_handler(self) -> AdminHandler:
return AdminHandler(self)

97
tests/config/test_tls.py
View file

@ -13,10 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import os
import idna
import yaml
from OpenSSL import SSL
@ -39,58 +36,6 @@ class TestConfig(RootConfig):
class TLSConfigTests(TestCase):
def test_warn_self_signed(self):
"""
Synapse will give a warning when it loads a self-signed certificate.
"""
config_dir = self.mktemp()
os.mkdir(config_dir)
with open(os.path.join(config_dir, "cert.pem"), "w") as f:
f.write(
"""-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----"""
)
config = {
"tls_certificate_path": os.path.join(config_dir, "cert.pem"),
}
t = TestConfig()
t.read_config(config, config_dir_path="", data_dir_path="")
t.read_tls_certificate()
warnings = self.flushWarnings()
self.assertEqual(len(warnings), 1)
self.assertEqual(
warnings[0]["message"],
(
"Self-signed TLS certificates will not be accepted by "
"Synapse 1.0. Please either provide a valid certificate, "
"or use Synapse's ACME support to provision one."
),
)
def test_tls_client_minimum_default(self):
"""
The default client TLS version is 1.0.
@ -202,48 +147,6 @@ s4niecZKPBizL6aucT59CsunNmmb5Glq8rlAcU+1ZTZZzGYqVYhF6axB9Qg=
self.assertEqual(options & SSL.OP_NO_TLSv1_1, 0)
self.assertEqual(options & SSL.OP_NO_TLSv1_2, 0)
def test_acme_disabled_in_generated_config_no_acme_domain_provied(self):
"""
Checks acme is disabled by default.
"""
conf = TestConfig()
conf.read_config(
yaml.safe_load(
TestConfig().generate_config(
"/config_dir_path",
"my_super_secure_server",
"/data_dir_path",
tls_certificate_path="/tls_cert_path",
tls_private_key_path="tls_private_key",
acme_domain=None, # This is the acme_domain
)
),
"/config_dir_path",
)
self.assertFalse(conf.acme_enabled)
def test_acme_enabled_in_generated_config_domain_provided(self):
"""
Checks acme is enabled if the acme_domain arg is set to some string.
"""
conf = TestConfig()
conf.read_config(
yaml.safe_load(
TestConfig().generate_config(
"/config_dir_path",
"my_super_secure_server",
"/data_dir_path",
tls_certificate_path="/tls_cert_path",
tls_private_key_path="tls_private_key",
acme_domain="my_supe_secure_server", # This is the acme_domain
)
),
"/config_dir_path",
)
self.assertTrue(conf.acme_enabled)
def test_whitelist_idna_failure(self):
"""
The federation certificate whitelist will not allow IDNA domain names.