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Prosody XMPP Docker image

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This docker image provides you with a configured Prosody XMPP server. The image is based on debian:bookworm-slim. The server was tested using the Android App Conversations and the Desktop client Gajim. Multiple architectures are supported. I use it on my raspberry pi 4.

While Conversations got everything set-up out-of-the-box, Gajim was used with the following extensions:

  • HttpUpload
  • Off-The-Record Encryption
  • OMEMO (requires python-axolotl to be installed)
  • Url Image preview

Table of Contents

Features

  • Secure by default
    • SSL certificate required
    • End-to-end encryption required (using OMEMO or OTR)
  • Data storage
    • SQLite message store
    • Configured file upload and image sharing
  • Multi-user chat (MUC)

Requirements

  • You need a SSL certificate. I recommend LetsEncrypt for that.

Image Details

Ports

The following ports are exposed:

  • 5000: proxy65 port used for file sharing
  • 5222: c2s port (client to server)
  • 5223: c2s legacy ssl port (client to server)
  • 5269: s2s port (server to server)
  • 5347: XMPP component port
  • 5280: BOSH / websocket port
  • 5281: Secure BOSH / websocket port

Directories

Data

Path: /usr/local/var/lib/prosody/.

  • used for SQLite file
  • used for HTTP uploads
  • this is exposed as docker volume

Bundled modules

Path: /usr/local/lib/prosody/modules/.

Additionally installed prosody modules

Path: /usr/local/lib/prosody/custom-modules/.

Config

Path: /usr/local/etc/prosody/.

  • containing the main config file called prosody.cfg.lua
  • containing additional config files within conf.d/

SSL certificates

Path: /usr/local/etc/prosody/certs/.

Uses automatic location to find your certs.

The http_upload module and the legacy_ssl module do not use the same search algorithm for the certificates. See service certificates.

The settings https_ssl and legacy_ssl_ssl in 05-vhost.cfg.lua configures the certificates to certs/domain.tld/fullchain.pem and certs/domain.tld/privkey.pem for legacy_ssl and to certs/DOMAIN_HTTP_UPLOAD/fullchain.pem and certs/DOMAIN_HTTP_UPLOAD/privkey.pem for http_upload where DOMAIN_HTTP_UPLOAD is an environtment variable.

Folder structure

An example certificate folder structure could look like this:

certs
├── conference.domain.tld
│   ├── fullchain.pem
│   └── privkey.pem
├── proxy.domain.tld
│   ├── fullchain.pem
│   └── privkey.pem
├── upload.domain.tld
│   ├── fullchain.pem
│   └── privkey.pem
└── domain.tld
    ├── fullchain.pem
    └── privkey.pem

Thats how Let's encrypt certbot does it out of the box.

Symlinks

certbot creates the structure and uses symlinks to the actual certificates. If you mount them like that prosody somehow does not find them. I copied them to a folder named certs next to my docker-compose.yml and made sure to use the -L flag of cp. This makes cp follow symbolic links when copying from them. For example cp -L src dest.

Permissions

See official documentation for more information. Check Volumes permissions as well.

Run

I recommend using a docker-compose.yml file:

version: '3.7'

services:
  server:
    image: sarasmiseth/prosody:latest
    restart: unless-stopped
    ports:
      - "5000:5000"
      - "5222:5222"
      - "5223:5223"
      - "5269:5269"
      - "5281:5281"
    environment:
      DOMAIN: domain.tld
    volumes:
      - ./certs:/usr/local/etc/prosody/certs
      - ./data:/usr/local/var/lib/prosody

Boot it via: docker compose up -d.

Inspect logs: docker compose logs -f.

Volumes permissions

The prosody user inside the container has the uid=999 and gid=999. If you use the example docker-compose.yml from above make sure, that the ./data folder and the ./certs folder have the correct permissions.

sudo chown 999:999 ./certs
sudo chown 999:999 ./data

Docker tags

https://hub.docker.com/r/sarasmiseth/prosody/tags

Tag Description
edge This tag points to the latest version build from the newest commit in the dev branch.
nightly This tag points to the latest version build from the newest commit in the dev branch. It gets rebuild every night.
latest This tag points to the latest version build from the latest commit that is tagged in git. See releases.
vX.Y.Z There is a tag for each release.

Configuration

Environment variables

Variable Description Type Default value
ALLOW_REGISTRATION Whether to allow registration of new accounts via Jabber clients optional true
DOMAIN domain required null
DOMAIN_HTTP_UPLOAD Domain which lets clients upload files over HTTP optional upload.DOMAIN
DOMAIN_MUC Domain for Multi-user chat (MUC) for allowing you to create hosted chatrooms/conferences for XMPP users optional conference.DOMAIN
DOMAIN_PROXY Domain for SOCKS5 bytestream proxy for server-proxied file transfers optional proxy.DOMAIN
DOMAIN_PUBSUB Domain for a XEP-0060 pubsub service optional pubsub.DOMAIN
AUTHENTICATION authentication optional "internal_hashed"
LDAP_BASE LDAP base directory which stores user accounts required if AUTHENTICATION is "ldap"
LDAP_SERVER Space-separated list of hostnames or IPs, optionally with port numbers (e.g. “localhost:8389”) optional "localhost"
LDAP_ROOTDN The distinguished name to auth against optional ""
LDAP_PASSWORD Password for rootdn optional ""
LDAP_FILTER Search filter, with $user and $host substituted for user- and hostname optional "(uid=$user)"
LDAP_SCOPE Search scope. other values: “base” and “onelevel” optional "subtree"
LDAP_TLS Enable TLS (StartTLS) to connect to LDAP (can be true or false). The non-standard ‘LDAPS’ protocol is not supported. optional "false"
LDAP_MODE How passwords are validated. optional "bind"
LDAP_ADMIN_FILTER Search filter to match admins, works like ldap_filter optional ""
DB_DRIVER May also be "PostgreSQL" or "MySQL" or "SQLite3" (case sensitive!) optional SQLite3
DB_DATABASE The database name to use. For SQLite3 this the database filename (relative to the data storage directory). optional prosody.sqlite
DB_HOST The address of the database server optional
DB_PORT Port on which the database is listening optional
DB_USERNAME The username to authenticate to the database optional
DB_PASSWORD The password to authenticate to the database optional
HTTP_MAX_CONTENT_SIZE Max http content size in bytes optional 10485760
HTTP_FILE_SHARE_SIZE_LIMIT Max http file share size in bytes optional 10485760
HTTP_FILE_SHARE_DAILY_QUOTA Daily quota in bytes optional 10 times share size limit
E2E_POLICY_CHAT Policy for chat messages. Possible values: "none", "optional" and "required". optional "required"
E2E_POLICY_MUC Policy for MUC messages. Possible values: "none", "optional" and "required". optional "required"
E2E_POLICY_WHITELIST Make this module ignore messages sent to and from this JIDs or MUCs. optional ""
LOG_LEVEL Min log level. Change to debug for more information optional info
C2S_REQUIRE_ENCRYPTION Whether to force all client-to-server connections to be encrypted or not optional true
S2S_REQUIRE_ENCRYPTION Whether to force all server-to-server connections to be encrypted or not optional true
S2S_SECURE_AUTH Require encryption and certificate authentication optional true
SERVER_CONTACT_INFO_ABUSE A list of strings. Each string should be an URI. See here. optional "xmpp:abuse@DOMAIN"
SERVER_CONTACT_INFO_ADMIN A list of strings. Each string should be an URI. See here. optional "xmpp:admin@DOMAIN"
SERVER_CONTACT_INFO_FEEDBACK A list of strings. Each string should be an URI. See here. optional "xmpp:feedback@DOMAIN"
SERVER_CONTACT_INFO_SALES A list of strings. Each string should be an URI. See here. optional "xmpp:sales@DOMAIN"
SERVER_CONTACT_INFO_SECURITY A list of strings. Each string should be an URI. See here. optional "xmpp:security@DOMAIN"
SERVER_CONTACT_INFO_SUPPORT A list of strings. Each string should be an URI. See here. optional "xmpp:support@DOMAIN"
PROSODY_ADMINS Specify who is an administrator. List of adresses. Eg. "me@example.com", "admin@example.net" optional ""

DNS

You need these DNS record pointing to your server:

  • domain.tld
  • conference.domain.tld
  • proxy.domain.tld
  • pubsub.domain.tld
  • upload.domain.tld
  • A SRV record for _xmpps-client._tcp.domain.tld for port 5223.

where domain.tld is the environment variable DOMAIN.

Extend

There is a helper script that eases installing additional prosody modules: docker-prosody-module-install

It downloads the current prosody-modules repository. The specified modules are copied and its name is added to the modules_enabled variable within conf.d/01-modules.cfg.lua.

There is also docker-prosody-module-copy which copies the specified modules but does not add them to the modules_enabled variable within conf.d/01-modules.cfg.lua.

If you need additional configuration just overwrite the respective cfg.lua file or add new ones.

Upgrade

When migrating from prosody 0.10, you need to update the database once:

docker compose exec server bash
prosodyctl mod_storage_sql upgrade

Test your server

You can test your server with these websites: