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110 lines
3.9 KiB
Markdown
110 lines
3.9 KiB
Markdown
# Mosquitto {#module-services-mosquitto}
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Mosquitto is a MQTT broker often used for IoT or home automation data transport.
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## Quickstart {#module-services-mosquitto-quickstart}
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A minimal configuration for Mosquitto is
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```nix
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{
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services.mosquitto = {
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enable = true;
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listeners = [ {
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acl = [ "pattern readwrite #" ];
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omitPasswordAuth = true;
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settings.allow_anonymous = true;
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} ];
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};
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}
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```
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This will start a broker on port 1883, listening on all interfaces of the machine, allowing
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read/write access to all topics to any user without password requirements.
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User authentication can be configured with the `users` key of listeners. A config that gives
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full read access to a user `monitor` and restricted write access to a user `service` could look
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like
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```nix
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{
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services.mosquitto = {
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enable = true;
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listeners = [ {
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users = {
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monitor = {
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acl = [ "read #" ];
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password = "monitor";
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};
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service = {
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acl = [ "write service/#" ];
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password = "service";
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};
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};
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} ];
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};
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}
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```
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TLS authentication is configured by setting TLS-related options of the listener:
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```nix
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{
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services.mosquitto = {
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enable = true;
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listeners = [ {
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port = 8883; # port change is not required, but helpful to avoid mistakes
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# ...
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settings = {
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cafile = "/path/to/mqtt.ca.pem";
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certfile = "/path/to/mqtt.pem";
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keyfile = "/path/to/mqtt.key";
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};
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} ];
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};
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}
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```
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## Configuration {#module-services-mosquitto-config}
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The Mosquitto configuration has four distinct types of settings:
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the global settings of the daemon, listeners, plugins, and bridges.
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Bridges and listeners are part of the global configuration, plugins are part of listeners.
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Users of the broker are configured as parts of listeners rather than globally, allowing
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configurations in which a given user is only allowed to log in to the broker using specific
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listeners (eg to configure an admin user with full access to all topics, but restricted to
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localhost).
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Almost all options of Mosquitto are available for configuration at their appropriate levels, some
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as NixOS options written in camel case, the remainders under `settings` with their exact names in
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the Mosquitto config file. The exceptions are `acl_file` (which is always set according to the
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`acl` attributes of a listener and its users) and `per_listener_settings` (which is always set to
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`true`).
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### Password authentication {#module-services-mosquitto-config-passwords}
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Mosquitto can be run in two modes, with a password file or without. Each listener has its own
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password file, and different listeners may use different password files. Password file generation
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can be disabled by setting `omitPasswordAuth = true` for a listener; in this case it is necessary
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to either set `settings.allow_anonymous = true` to allow all logins, or to configure other
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authentication methods like TLS client certificates with `settings.use_identity_as_username = true`.
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The default is to generate a password file for each listener from the users configured to that
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listener. Users with no configured password will not be added to the password file and thus
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will not be able to use the broker.
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### ACL format {#module-services-mosquitto-config-acl}
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Every listener has a Mosquitto `acl_file` attached to it. This ACL is configured via two
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attributes of the config:
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* the `acl` attribute of the listener configures pattern ACL entries and topic ACL entries
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for anonymous users. Each entry must be prefixed with `pattern` or `topic` to distinguish
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between these two cases.
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* the `acl` attribute of every user configures in the listener configured the ACL for that
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given user. Only topic ACLs are supported by Mosquitto in this setting, so no prefix is
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required or allowed.
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The default ACL for a listener is empty, disallowing all accesses from all clients. To configure
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a completely open ACL, set `acl = [ "pattern readwrite #" ]` in the listener.
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