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ACME config cleanups (#4525)

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* Handle listening for ACME requests on IPv6 addresses

the weird url-but-not-actually-a-url-string doesn't handle IPv6 addresses
without extra quoting. Building a string which you are about to parse again
seems like a weird choice. Let's just use listenTCP, which is consistent with
what we do elsewhere.

* Clean up the default ACME config

make it look a bit more consistent with everything else, and tweak the defaults
to listen on port 80.

* newsfile
This commit is contained in:
Richard van der Hoff 2019-01-30 14:17:55 +00:00 • committed by Amber Brown
parent 43c6fca960
commit 7615a8ced1
5 changed files with 115 additions and 60 deletions
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100
synapse/config/tls.py
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@ -31,13 +31,16 @@ logger = logging.getLogger()
class TlsConfig(Config):
def read_config(self, config):
acme_config = config.get("acme", {})
acme_config = config.get("acme", None)
if acme_config is None:
acme_config = {}
self.acme_enabled = acme_config.get("enabled", False)
self.acme_url = acme_config.get(
"url", "https://acme-v01.api.letsencrypt.org/directory"
)
self.acme_port = acme_config.get("port", 8449)
self.acme_bind_addresses = acme_config.get("bind_addresses", ["127.0.0.1"])
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.tls_certificate_file = self.abspath(config.get("tls_certificate_path"))
@ -126,21 +129,80 @@ class TlsConfig(Config):
tls_certificate_path = base_key_name + ".tls.crt"
tls_private_key_path = base_key_name + ".tls.key"
# this is to avoid the max line length. Sorrynotsorry
proxypassline = (
'ProxyPass /.well-known/acme-challenge '
'http://localhost:8009/.well-known/acme-challenge'
)
return (
"""\
# PEM encoded X509 certificate for TLS.
# This certificate, as of Synapse 1.0, will need to be a valid
# and verifiable certificate, with a root that is available in
# the root store of other servers you wish to federate to. Any
# required intermediary certificates can be appended after the
# primary certificate in hierarchical order.
# PEM-encoded X509 certificate for TLS.
# 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.
#
tls_certificate_path: "%(tls_certificate_path)s"
# PEM encoded private key for TLS
# PEM-encoded private key for TLS
tls_private_key_path: "%(tls_private_key_path)s"
# Don't bind to the https port
no_tls: False
# ACME support: This will configure Synapse to request a valid TLS certificate
# for your configured `server_name` via Let's Encrypt.
#
# 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. Uncomment the following line
# to enable it.
#
# enabled: true
# 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
# If your server runs behind a reverse-proxy which terminates TLS connections
# (for both client and federation connections), it may be useful to disable
# All TLS support for incoming connections. Setting no_tls to False will
# do so (and avoid the need to give synapse a TLS private key).
#
# no_tls: False
# List of allowed TLS fingerprints for this server to publish along
# with the signing keys for this server. Other matrix servers that
@ -170,20 +232,6 @@ class TlsConfig(Config):
tls_fingerprints: []
# tls_fingerprints: [{"sha256": "<base64_encoded_sha256_fingerprint>"}]
## Support for ACME certificate auto-provisioning.
# acme:
# enabled: false
## ACME path.
## If you only want to test, use the staging url:
## https://acme-staging.api.letsencrypt.org/directory
# url: 'https://acme-v01.api.letsencrypt.org/directory'
## Port number (to listen for the HTTP-01 challenge).
## Using port 80 requires utilising something like authbind, or proxying to it.
# port: 8449
## Hosts to bind to.
# bind_addresses: ['127.0.0.1']
## How many days remaining on a certificate before it is renewed.
# reprovision_threshold: 30
"""
% locals()
)