nix-config/modules/services/matrix.nix

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# Matrix homeserver setup, using different endpoints for federation and client
# traffic. The main trick for this is defining two nginx servers endpoints for
# matrix.domain.com, each listening on different ports.
#
# Configuration shamelessly stolen from [1]
#
# [1]: https://github.com/alarsyo/nixos-config/blob/main/services/matrix.nix
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.my.services.matrix;
federationPort = { public = 8448; private = 11338; };
clientPort = { public = 443; private = 11339; };
domain = config.networking.domain;
in
{
options.my.services.matrix = with lib; {
enable = mkEnableOption "Matrix Synapse";
secret = mkOption {
type = types.str;
example = "deadbeef";
description = "Shared secret to register users";
};
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};
config = lib.mkIf cfg.enable {
services.postgresql = {
enable = true;
package = pkgs.postgresql_12;
initialScript = pkgs.writeText "synapse-init.sql" ''
CREATE ROLE "matrix-synapse" WITH LOGIN PASSWORD 'synapse';
CREATE DATABASE "matrix-synapse" WITH OWNER "matrix-synapse"
TEMPLATE template0
LC_COLLATE = "C"
LC_CTYPE = "C";
'';
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};
services.matrix-synapse = {
enable = true;
dataDir = "/var/lib/matrix-synapse";
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server_name = domain;
public_baseurl = "https://matrix.${domain}";
enable_registration = false;
registration_shared_secret = cfg.secret;
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listeners = [
# Federation
{
bind_address = "::1";
port = federationPort.private;
tls = false; # Terminated by nginx.
x_forwarded = true;
resources = [{ names = [ "federation" ]; compress = false; }];
}
# Client
{
bind_address = "::1";
port = clientPort.private;
tls = false; # Terminated by nginx.
x_forwarded = true;
resources = [{ names = [ "client" ]; compress = false; }];
}
];
account_threepid_delegates.msisdn = "https://vector.im";
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};
services.nginx.virtualHosts = {
"matrix.${domain}" = {
forceSSL = true;
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useACMEHost = domain;
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locations =
let
proxyToClientPort = {
proxyPass = "http://[::1]:${toString clientPort.private}";
};
in
{
# Or do a redirect instead of the 404, or whatever is appropriate
# for you. But do not put a Matrix Web client here! See the
# Element web section below.
"/".return = "404";
"/_matrix" = proxyToClientPort;
"/_synapse/client" = proxyToClientPort;
};
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listen = [
{ addr = "0.0.0.0"; port = clientPort.public; ssl = true; }
{ addr = "[::]"; port = clientPort.public; ssl = true; }
];
};
# same as above, but listening on the federation port
"matrix.${domain}_federation" = rec {
forceSSL = true;
serverName = "matrix.${domain}";
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useACMEHost = domain;
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locations."/".return = "404";
locations."/_matrix" = {
proxyPass = "http://[::1]:${toString federationPort.private}";
};
listen = [
{ addr = "0.0.0.0"; port = federationPort.public; ssl = true; }
{ addr = "[::]"; port = federationPort.public; ssl = true; }
];
};
"${domain}" = {
forceSSL = true;
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useACMEHost = domain;
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locations."= /.well-known/matrix/server".extraConfig =
let
server = { "m.server" = "matrix.${domain}:${toString federationPort.public}"; };
in
''
add_header Content-Type application/json;
return 200 '${builtins.toJSON server}';
'';
locations."= /.well-known/matrix/client".extraConfig =
let
client = {
"m.homeserver" = { "base_url" = "https://matrix.${domain}"; };
"m.identity_server" = { "base_url" = "https://vector.im"; };
};
# ACAO required to allow element-web on any URL to request this json file
in
''
add_header Content-Type application/json;
add_header Access-Control-Allow-Origin *;
return 200 '${builtins.toJSON client}';
'';
};
# Element Web app deployment
"chat.${domain}" = {
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useACMEHost = domain;
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forceSSL = true;
root = pkgs.element-web.override {
conf = {
default_server_config = {
"m.homeserver" = {
"base_url" = "https://matrix.${domain}";
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"server_name" = domain;
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};
"m.identity_server" = {
"base_url" = "https://vector.im";
};
};
showLabsSettings = true;
defaultCountryCode = "FR"; # cocorico
roomDirectory = {
"servers" = [
"matrix.org"
"mozilla.org"
];
};
};
};
};
};
# For administration tools.
environment.systemPackages = [ pkgs.matrix-synapse ];
networking.firewall.allowedTCPPorts = [
clientPort.public
federationPort.public
];
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my.services.backup = {
paths = [
config.services.matrix-synapse.dataDir
];
};
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};
}