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Apache-2.0

Synapse (get support on #synapse:matrix.org) (discuss development on #synapse-dev:matrix.org) (Rendered documentation on GitHub Pages) (check license in LICENSE file) (latest version released on PyPi) (supported python versions)

Synapse is now actively maintained at element-hq/synapse

Synapse is an open-source Matrix homeserver developed from 2019 through 2023 as part of the Matrix.org Foundation. The Matrix.org Foundation is not able to resource maintenance of Synapse and it continues to be developed by Element; additionally you have the choice of other Matrix homeservers.

See The future of Synapse and Dendrite blog post for more information.


Briefly, Matrix is an open standard for communications on the internet, supporting federation, encryption and VoIP. Matrix.org has more to say about the goals of the Matrix project, and the formal specification describes the technical details.

Installing and configuration

The Synapse documentation describes how to install Synapse. We recommend using Docker images or Debian packages from Matrix.org.

Synapse has a variety of config options which can be used to customise its behaviour after installation. There are additional details on how to configure Synapse for federation here.

Using a reverse proxy with Synapse

It is recommended to put a reverse proxy such as nginx, Apache, Caddy, HAProxy or relayd 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 the reverse proxy docs.

Upgrading an existing Synapse

The instructions for upgrading Synapse are in the upgrade notes. Please check these instructions as upgrading may require extra steps for some versions of Synapse.

Platform dependencies

Synapse uses a number of platform dependencies such as Python and PostgreSQL, and aims to follow supported upstream versions. See the deprecation policy for more details.

Security note

Matrix serves raw, user-supplied data in some APIs -- specifically the content repository endpoints.

Whilst we make a reasonable effort to mitigate against XSS attacks (for instance, by using CSP), a Matrix homeserver should not be hosted on a domain hosting other web applications. This especially applies to sharing the domain with Matrix web clients and other sensitive applications like webmail. See https://developer.github.com/changes/2014-04-25-user-content-security for more information.

Ideally, the homeserver should not simply be on a different subdomain, but on a completely different registered domain (also known as top-level site or eTLD+1). This is because some attacks are still possible as long as the two applications share the same registered domain.

To illustrate this with an example, if your Element Web or other sensitive web application is hosted on A.example1.com, you should ideally host Synapse on example2.com. Some amount of protection is offered by hosting on B.example1.com instead, so this is also acceptable in some scenarios. However, you should not host your Synapse on A.example1.com.

Note that all of the above refers exclusively to the domain used in Synapse's public_baseurl setting. In particular, it has no bearing on the domain mentioned in MXIDs hosted on that server.

Following this advice ensures that even if an XSS is found in Synapse, the impact to other applications will be minimal.

Testing a new installation

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 TLS certificates.

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://<server_name>:8448 (or just https://<server_name> 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.

Registering a new user from a client

By default, registration of new users via Matrix clients is disabled. To enable it:

  1. In the registration config section set enable_registration: true in homeserver.yaml.
  2. Then either:
    1. set up a CAPTCHA, or
    2. set enable_registration_without_verification: true in homeserver.yaml.

We strongly recommend using a CAPTCHA, particularly if your homeserver is exposed to the public internet. Without it, anyone can freely register accounts on your homeserver. This can be exploited by attackers to create spambots targetting the rest of the Matrix federation.

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.

Troubleshooting and support

The Admin FAQ includes tips on dealing with some common problems. For more details, see Synapse's wider documentation.

For additional support installing or managing Synapse, please ask in the community support room #synapse:matrix.org (from a matrix.org account if necessary). We do not use GitHub issues for support requests, only for bug reports and feature requests.

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.

Development

We welcome contributions to Synapse from the community! The best place to get started is our guide for contributors. This is part of our larger documentation, which includes

information for Synapse developers as well as Synapse administrators. Developers might be particularly interested in:

Alongside all that, join our developer community on Matrix: #synapse-dev:matrix.org, featuring real humans!

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Matrix 是一个去中心化即时通讯和群组聊天的开放标准,提供简单的 HTP 接口和开放的参考实现,用于在服务器之间提供安全分布式和持久化的 JSON 传输 展开 收起
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