Synapse: Matrix reference homeserver

Erik Johnston 2756517f7a Fixup changelog 3 years ago
.buildkite a71be9d62d Fix Python 3.5 old deps build by using a compatible pip version. (#9217) 3 years ago
.circleci 9d64e4dbd6 Drop ARMv7 from docker (#9433) 3 years ago
.github 8b786db323 bug report template: move comments into comment (#8030) 3 years ago
changelog.d b5c4fe1971 1.28.0 3 years ago
contrib 0a00b7ff14 Update black, and run auto formatting over the codebase (#9381) 3 years ago
debian b5c4fe1971 1.28.0 3 years ago
demo 195adf4025 Remove broken and unmaintained 'webserver.py' script (#9039) 3 years ago
docker b8b172466f Add rustc to Docker image build environment (#9405) 3 years ago
docs e17553e185 Parse ui_auth.session_timeout as a duration (instead of treating it as ms) (#9426) 3 years ago
scripts 7036e24e98 Add background update for add chain cover index (#9029) 3 years ago
scripts-dev 0a00b7ff14 Update black, and run auto formatting over the codebase (#9381) 3 years ago
snap 701788a227 Added explicit Python build tools to snap requirements (#7213) 4 years ago
stubs 0a00b7ff14 Update black, and run auto formatting over the codebase (#9381) 3 years ago
synapse b5c4fe1971 1.28.0 3 years ago
synmark 0a00b7ff14 Update black, and run auto formatting over the codebase (#9381) 3 years ago
tests e17553e185 Parse ui_auth.session_timeout as a duration (instead of treating it as ms) (#9426) 3 years ago
.codecov.yml 6be336c0d8 Disable codecov reports to GH comments. 4 years ago
.coveragerc e7011280c7 Fix coverage in sytest and use plugins for buildkite (#5922) 4 years ago
.dockerignore b2d2617c0d Reduce the amount of stuff we send in the docker context (#5564) 4 years ago
.editorconfig 3518c28aa8 Add a basic .editorconfig 5 years ago
.gitignore 20af310889 Add some extra notes for getting Synapse running on macOS. (#8997) 3 years ago
AUTHORS.rst 9d173b312c Automatically delete empty groups/communities (#6453) 4 years ago
CHANGES.md 2756517f7a Fixup changelog 3 years ago
CONTRIBUTING.md 9e19c6aab4 Reorganize CONTRIBUTING.md documentation. (#9281) 3 years ago
INSTALL.md 5a9cdaa6e9 Update installation instructions on Fedora (#9322) 3 years ago
LICENSE 4f475c7697 Reference Matrix Home Server 9 years ago
MANIFEST.in 9858d5c362 Fix ordering in MANIFEST.in 3 years ago
README.rst 4c37d2acd5 Fix reStructuredText formatting. 3 years ago
UPGRADE.rst 9ee3b9775f Remove deprecated SAML2 callback URL since it does not work. (#9434) 3 years ago
mypy.ini d2f0ec12d5 Add type hints to groups code. (#9393) 3 years ago
pylint.cfg 53f69bf089 Added pylint config file: ignore missing-docstring messages. 9 years ago
pyproject.toml aff1eb7c67 Tell Black to format code for Python 3.5 (#8664) 3 years ago
setup.cfg 01f82bfe32 Remove docs/sphinx and related references (#8480) 3 years ago
setup.py 0a00b7ff14 Update black, and run auto formatting over the codebase (#9381) 3 years ago
synctl 7127855741 Fix synctl and duplicate worker spawning (#8798) 3 years ago
sytest-blacklist d373ec2f72 unblacklist some tests (#8474) 3 years ago
test_postgresql.sh 741571cf22 Add a way to run tests in PostgreSQL in Docker (#3699) 5 years ago
tox.ini a71be9d62d Fix Python 3.5 old deps build by using a compatible pip version. (#9217) 3 years ago

README.rst

=========================================================
Synapse |support| |development| |license| |pypi| |python|
=========================================================

.. contents::

Introduction
============

Matrix is an ambitious new ecosystem for open federated Instant Messaging and
VoIP. The basics you need to know to get up and running are:

- Everything in Matrix happens in a room. Rooms are distributed and do not
exist on any single server. Rooms can be located using convenience aliases
like ``#matrix:matrix.org`` or ``#test:localhost:8448``.

- Matrix user IDs look like ``@matthew:matrix.org`` (although in the future
you will normally refer to yourself and others using a third party identifier
(3PID): email address, phone number, etc rather than manipulating Matrix user IDs)

The overall architecture is::

client <----> homeserver <=====================> homeserver <----> client
https://somewhere.org/_matrix https://elsewhere.net/_matrix

``#matrix:matrix.org`` is the official support room for Matrix, and can be
accessed by any client from https://matrix.org/docs/projects/try-matrix-now.html or
via IRC bridge at irc://irc.freenode.net/matrix.

Synapse is currently in rapid development, but as of version 0.5 we believe it
is sufficiently stable to be run as an internet-facing service for real usage!

About Matrix
============

Matrix specifies a set of pragmatic RESTful HTTP JSON APIs as an open standard,
which handle:

- Creating and managing fully distributed chat rooms with no
single points of control or failure
- Eventually-consistent cryptographically secure synchronisation of room
state across a global open network of federated servers and services
- Sending and receiving extensible messages in a room with (optional)
end-to-end encryption
- Inviting, joining, leaving, kicking, banning room members
- Managing user accounts (registration, login, logout)
- Using 3rd Party IDs (3PIDs) such as email addresses, phone numbers,
Facebook accounts to authenticate, identify and discover users on Matrix.
- Placing 1:1 VoIP and Video calls

These APIs are intended to be implemented on a wide range of servers, services
and clients, letting developers build messaging and VoIP functionality on top
of the entirely open Matrix ecosystem rather than using closed or proprietary
solutions. The hope is for Matrix to act as the building blocks for a new
generation of fully open and interoperable messaging and VoIP apps for the
internet.

Synapse is a reference "homeserver" implementation of Matrix from the core
development team at matrix.org, written in Python/Twisted. It is intended to
showcase the concept of Matrix and let folks see the spec in the context of a
codebase and let you run your own homeserver and generally help bootstrap the
ecosystem.

In Matrix, every user runs one or more Matrix clients, which connect through to
a Matrix homeserver. The homeserver stores all their personal chat history and
user account information - much as a mail client connects through to an
IMAP/SMTP server. Just like email, you can either run your own Matrix
homeserver and control and own your own communications and history or use one
hosted by someone else (e.g. matrix.org) - there is no single point of control
or mandatory service provider in Matrix, unlike WhatsApp, Facebook, Hangouts,
etc.

We'd like to invite you to join #matrix:matrix.org (via
https://matrix.org/docs/projects/try-matrix-now.html), run a homeserver, take a look
at the `Matrix spec `_, and experiment with the
`APIs `_ and `Client SDKs
`_.

Thanks for using Matrix!

Support
=======

For support installing or managing Synapse, please join |room|_ (from a matrix.org
account if necessary) and ask questions there. We do not use GitHub issues for
support requests, only for bug reports and feature requests.

.. |room| replace:: ``#synapse:matrix.org``
.. _room: https://matrix.to/#/#synapse:matrix.org


Synapse Installation
====================

.. _federation:

* For details on how to install synapse, see ``_.
* For specific details on how to configure Synapse for federation see `docs/federate.md `_


Connecting to Synapse from a client
===================================

The easiest way to try out your new Synapse installation is by connecting to it
from a web client.

Unless you are running a test instance of Synapse on your local machine, in
general, you will need to enable TLS support before you can successfully
connect from a client: see ``_.

An easy way to get started is to login or register via Element at
https://app.element.io/#/login or https://app.element.io/#/register respectively.
You will need to change the server you are logging into from ``matrix.org``
and instead specify a Homeserver URL of ``https://:8448``
(or just ``https://`` if you are using a reverse proxy).
If you prefer to use another client, refer to our
`client breakdown `_.

If all goes well you should at least be able to log in, create a room, and
start sending messages.

.. _`client-user-reg`:

Registering a new user from a client
------------------------------------

By default, registration of new users via Matrix clients is disabled. To enable
it, specify ``enable_registration: true`` in ``homeserver.yaml``. (It is then
recommended to also set up CAPTCHA - see ``_.)

Once ``enable_registration`` is set to ``true``, it is possible to register a
user via a Matrix client.

Your new user name will be formed partly from the ``server_name``, and partly
from a localpart you specify when you create the account. Your name will take
the form of::

@localpart:my.domain.name

(pronounced "at localpart on my dot domain dot name").

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 ``_.


Security Note
=============

Matrix serves raw user generated data in some APIs - specifically the `content
repository endpoints `_.

Whilst we have tried to mitigate against possible XSS attacks (e.g.
https://github.com/matrix-org/synapse/pull/1021) we recommend running
matrix homeservers on a dedicated domain name, to limit any malicious user generated
content served to web browsers a matrix API from being able to attack webapps hosted
on the same domain. This is particularly true of sharing a matrix webclient and
server on the same domain.

See https://github.com/vector-im/riot-web/issues/1977 and
https://developer.github.com/changes/2014-04-25-user-content-security for more details.


Upgrading an existing Synapse
=============================

The instructions for upgrading synapse are in `UPGRADE.rst`_.
Please check these instructions as upgrading may require extra steps for some
versions of synapse.

.. _UPGRADE.rst: UPGRADE.rst

.. _reverse-proxy:

Using a reverse proxy with Synapse
==================================

It is recommended to put a reverse proxy such as
`nginx `_,
`Apache `_,
`Caddy `_ or
`HAProxy `_ in front of Synapse. One advantage of
doing so is that it means that you can expose the default https port (443) to
Matrix clients without needing to run Synapse with root privileges.

For information on configuring one, see ``_.

Identity Servers
================

Identity servers have the job of mapping email addresses and other 3rd Party
IDs (3PIDs) to Matrix user IDs, as well as verifying the ownership of 3PIDs
before creating that mapping.

**They are not where accounts or credentials are stored - these live on home
servers. Identity Servers are just for mapping 3rd party IDs to matrix IDs.**

This process is very security-sensitive, as there is obvious risk of spam if it
is too easy to sign up for Matrix accounts or harvest 3PID data. In the longer
term, we hope to create a decentralised system to manage it (`matrix-doc #712
`_), but in the meantime,
the role of managing trusted identity in the Matrix ecosystem is farmed out to
a cluster of known trusted ecosystem partners, who run 'Matrix Identity
Servers' such as `Sydent `_, whose role
is purely to authenticate and track 3PID logins and publish end-user public
keys.

You can host your own copy of Sydent, but this will prevent you reaching other
users in the Matrix ecosystem via their email address, and prevent them finding
you. We therefore recommend that you use one of the centralised identity servers
at ``https://matrix.org`` or ``https://vector.im`` for now.

To reiterate: the Identity server will only be used if you choose to associate
an email address with your account, or send an invite to another user via their
email address.


Password reset
==============

Users can reset their password through their client. Alternatively, a server admin
can reset a users password using the `admin API `_
or by directly editing the database as shown below.

First calculate the hash of the new password::

$ ~/synapse/env/bin/hash_password
Password:
Confirm password:
$2a$12$xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Then update the ``users`` table in the database::

UPDATE users SET password_hash='$2a$12$xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
WHERE name='@test:test.com';


Synapse Development
===================

Join our developer community on Matrix: `#synapse-dev:matrix.org `_

Before setting up a development environment for synapse, make sure you have the
system dependencies (such as the python header files) installed - see
`Installing from source `_.

To check out a synapse for development, clone the git repo into a working
directory of your choice::

git clone https://github.com/matrix-org/synapse.git
cd synapse

Synapse has a number of external dependencies, that are easiest
to install using pip and a virtualenv::

python3 -m venv ./env
source ./env/bin/activate
pip install -e ".[all,test]"

This will run a process of downloading and installing all the needed
dependencies into a virtual env. If any dependencies fail to install,
try installing the failing modules individually::

pip install -e "module-name"

Once this is done, you may wish to run Synapse's unit tests to
check that everything is installed correctly::

python -m twisted.trial tests

This should end with a 'PASSED' result (note that exact numbers will
differ)::

Ran 1337 tests in 716.064s

PASSED (skips=15, successes=1322)

We recommend using the demo which starts 3 federated instances running on ports `8080` - `8082`

./demo/start.sh

(to stop, you can use `./demo/stop.sh`)

If you just want to start a single instance of the app and run it directly::

# Create the homeserver.yaml config once
python -m synapse.app.homeserver \
--server-name my.domain.name \
--config-path homeserver.yaml \
--generate-config \
--report-stats=[yes|no]

# Start the app
python -m synapse.app.homeserver --config-path homeserver.yaml




Running the Integration Tests
=============================

Synapse is accompanied by `SyTest `_,
a Matrix homeserver integration testing suite, which uses HTTP requests to
access the API as a Matrix client would. It is able to run Synapse directly from
the source tree, so installation of the server is not required.

Testing with SyTest is recommended for verifying that changes related to the
Client-Server API are functioning correctly. See the `installation instructions
`_ for details.

Troubleshooting
===============

Need help? Join our community support room on Matrix:
`#synapse:matrix.org `_

Running out of File Handles
---------------------------

If synapse runs out of file handles, it typically fails badly - live-locking
at 100% CPU, and/or failing to accept new TCP connections (blocking the
connecting client). Matrix currently can legitimately use a lot of file handles,
thanks to busy rooms like #matrix:matrix.org containing hundreds of participating
servers. The first time a server talks in a room it will try to connect
simultaneously to all participating servers, which could exhaust the available
file descriptors between DNS queries & HTTPS sockets, especially if DNS is slow
to respond. (We need to improve the routing algorithm used to be better than
full mesh, but as of March 2019 this hasn't happened yet).

If you hit this failure mode, we recommend increasing the maximum number of
open file handles to be at least 4096 (assuming a default of 1024 or 256).
This is typically done by editing ``/etc/security/limits.conf``

Separately, Synapse may leak file handles if inbound HTTP requests get stuck
during processing - e.g. blocked behind a lock or talking to a remote server etc.
This is best diagnosed by matching up the 'Received request' and 'Processed request'
log lines and looking for any 'Processed request' lines which take more than
a few seconds to execute. Please let us know at #synapse:matrix.org if
you see this failure mode so we can help debug it, however.

Help!! Synapse is slow and eats all my RAM/CPU!
-----------------------------------------------

First, ensure you are running the latest version of Synapse, using Python 3
with a PostgreSQL database.

Synapse's architecture is quite RAM hungry currently - we deliberately
cache a lot of recent room data and metadata in RAM in order to speed up
common requests. We'll improve this in the future, but for now the easiest
way to either reduce the RAM usage (at the risk of slowing things down)
is to set the almost-undocumented ``SYNAPSE_CACHE_FACTOR`` environment
variable. The default is 0.5, which can be decreased to reduce RAM usage
in memory constrained enviroments, or increased if performance starts to
degrade.

However, degraded performance due to a low cache factor, common on
machines with slow disks, often leads to explosions in memory use due
backlogged requests. In this case, reducing the cache factor will make
things worse. Instead, try increasing it drastically. 2.0 is a good
starting value.

Using `libjemalloc `_ can also yield a significant
improvement in overall memory use, and especially in terms of giving back
RAM to the OS. To use it, the library must simply be put in the
LD_PRELOAD environment variable when launching Synapse. On Debian, this
can be done by installing the ``libjemalloc1`` package and adding this
line to ``/etc/default/matrix-synapse``::

LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.1

This can make a significant difference on Python 2.7 - it's unclear how
much of an improvement it provides on Python 3.x.

If you're encountering high CPU use by the Synapse process itself, you
may be affected by a bug with presence tracking that leads to a
massive excess of outgoing federation requests (see `discussion
`_). If metrics
indicate that your server is also issuing far more outgoing federation
requests than can be accounted for by your users' activity, this is a
likely cause. The misbehavior can be worked around by setting
``use_presence: false`` in the Synapse config file.

People can't accept room invitations from me
--------------------------------------------

The typical failure mode here is that you send an invitation to someone
to join a room or direct chat, but when they go to accept it, they get an
error (typically along the lines of "Invalid signature"). They might see
something like the following in their logs::

2019-09-11 19:32:04,271 - synapse.federation.transport.server - 288 - WARNING - GET-11752 - authenticate_request failed: 401: Invalid signature for server with key ed25519:a_EqML: Unable to verify signature for

This is normally caused by a misconfiguration in your reverse-proxy. See
``_ and double-check that your settings are correct.

.. |support| image:: https://img.shields.io/matrix/synapse:matrix.org?label=support&logo=matrix
:alt: (get support on #synapse:matrix.org)
:target: https://matrix.to/#/#synapse:matrix.org

.. |development| image:: https://img.shields.io/matrix/synapse-dev:matrix.org?label=development&logo=matrix
:alt: (discuss development on #synapse-dev:matrix.org)
:target: https://matrix.to/#/#synapse-dev:matrix.org

.. |license| image:: https://img.shields.io/github/license/matrix-org/synapse
:alt: (check license in LICENSE file)
:target: LICENSE

.. |pypi| image:: https://img.shields.io/pypi/v/matrix-synapse
:alt: (latest version released on PyPi)
:target: https://pypi.org/project/matrix-synapse

.. |python| image:: https://img.shields.io/pypi/pyversions/matrix-synapse
:alt: (supported python versions)
:target: https://pypi.org/project/matrix-synapse