docs: refine acl.conf comments
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zmstone
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%%--------------------------------------------------------------------
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%% -type(ipaddr() :: {ipaddr, string()}).
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%%
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%% -type(ipaddrs() :: {ipaddrs, [string()]}).
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%%
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%% -type(username() :: {user | username, string()} | {user | username, {re, regex()}}).
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%%
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%% -type(clientid() :: {client | clientid, string()} | {client | clientid, {re, regex()}}).
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%%
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%% -type(who() :: ipaddr() | ipaddrs() | username() | clientid() |
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%% {'and', [ipaddr() | ipaddrs() | username() | clientid()]} |
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%% {'or', [ipaddr() | ipaddrs() | username() | clientid()]} |
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%% all).
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%%
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%% -type(action() :: subscribe | publish | all).
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%%
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%% -type(topic_filters() :: string()).
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%%
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%% -type(topics() :: [topic_filters() | {eq, topic_filters()}]).
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%%
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%% -type(permission() :: allow | deny).
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%%
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%% -type(rule() :: {permission(), who(), action(), topics()} | {permission(), all}).
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%%--------------------------------------------------------------------
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%%-------------- Default ACL rules -------------------------------------------------------
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{allow, {username, {re, "^dashboard$"}}, subscribe, ["$SYS/#"]}.
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@ -29,4 +6,116 @@
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{deny, all, subscribe, ["$SYS/#", {eq, "#"}]}.
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%% NOTE: change to {deny, all} in production!
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{allow, all}.
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%% See docs below
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%%
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%% ------------ The formal spec ----------------------------------------------------------
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%%
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%% -type ipaddr() :: {ipaddr, string()}.
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%% -type ipaddrs() :: {ipaddrs, [string()]}.
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%% -type username() :: {user | username, string()} | {user | username, {re, regex()}}.
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%% -type clientid() :: {client | clientid, string()} | {client | clientid, {re, regex()}}.
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%% -type who() :: ipaddr() | ipaddrs() | username() | clientid() |
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%% {'and', [ipaddr() | ipaddrs() | username() | clientid()]} |
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%% {'or', [ipaddr() | ipaddrs() | username() | clientid()]} |
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%% all.
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%% -type simple_action() :: subscribe | publish | all.
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%% -type complex_action() :: {simple_action(), [{qos, 0..2}, {retain, true|false|all}]}.
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%% -type action() :: simple_action() | complex_action().
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%% -type topic() :: string().
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%% -type topic_filter() :: string().
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%% -type topic_match() :: topic() | topic_filter() | {eq, topic() | topic_filter()}.
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%% -type perm() :: allow | deny.
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%% -type rule() :: {perm(), who(), action(), [topic_match()]} | {perm(), all}.
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%%-------------- Viusal aid for the spec -------------------------------------------------
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%%
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%% rule()
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%% ├── {perm(), who(), action(), [topic_match()]}
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%% │ │ │ │ ├── topic() :: string()
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%% │ │ │ │ ├── topic_filter() :: string()
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%% │ │ │ │ └── {eq, topic() | topic_filter()}
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%% │ │ │ │
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%% │ │ │ ├── simple_action()
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%% │ │ │ │ ├── publish
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%% │ │ │ │ ├── subscribe
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%% │ │ │ │ └── all
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%% │ │ │ └── {simple_action(), [{qos,0..2},{retain,true|false|all}]}
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%% │ │ │
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%% │ │ ├── ipaddr()
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%% │ │ │ └── {ipaddr, string()}
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%% │ │ ├── ipaddrs()
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%% │ │ │ └── {ipaddrs, [string()]}
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%% │ │ ├── username()
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%% │ │ │ ├── {user | username, string()}
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%% │ │ │ └── {user | username, {re, regex()}}
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%% │ │ ├── clientid()
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%% │ │ │ ├── {client | clientid, string()}
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%% │ │ │ └── {client | clientid, {re, regex()}}
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%% │ │ ├── {'and', [ipaddr() | ipaddrs() | username() | clientid()]}
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%% │ │ ├── {'or', [ipaddr() | ipaddrs() | username() | clientid()]}
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%% │ │ └── all
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%% │ │
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%% │ ├── allow
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%% │ └── deny
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%% │
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%% └── {perm(), all}
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%%
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%% This file defines a set of ACL rules for MQTT client pub/sub authorization.
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%% The content is of Erlang-term format.
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%% Each Erlang-term is a tuple `{...}` terminated by dot `.`
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%%
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%% NOTE: When deploy to production, the last rule should be changed to {deny, all}.
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%%
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%% NOTE: It's a good practice to keep the nubmer of rules small, because in worst case
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%% scenarios, all rules have to be traversed for each message publish.
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%%
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%% A rule is a 4-element tuple.
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%% For example, `{allow, {username, "Jon"}, subscribe, ["#"]}` allows Jon to subscribe to
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%% any topic they want.
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%%
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%% Below is an explanation:
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%%
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%% - `perm()`: The permission.
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%% Defines whether this is an `allow` or `deny` rule.
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%%
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%% - `who()`: The MQTT client matching condition.
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%% - `all`: A rule which applies to all clients.
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%% - `{ipaddr, IpAddress}`: Matches a client by source IP address. CIDR notation is allowed.
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%% - `{ipaddrs, [IpAddress]}`: Matches clients by a set of IP addresses. CIDR notation is allowed.
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%% - `{clientid, ClientID}`: Matches a client by ID.
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%% - `{username, Username}`: Matches a client by username.
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%% - `{..., {re, ..}}`: Regular expression to match either clientid or username.
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%% - `{'and', [...]}`: Combines a list of matching conditions.
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%% - `{'or', [...]}`: Combines a list of matching conditions.
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%%
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%% - `action()`: Matches publish or subscribe actions (or both).
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%% Applies the rule to `publish` or `subscribe` actions.
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%% The special value `all` denotes allowing or denying both `publish` and `subscribe`.
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%% It can also be associated with `qos` and `retain` flags to match the action with
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%% more specifics. For example, `{publish, [{qos,0},{retain,false}]}` should only
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%% match the `publish` action when the message has QoS 0, and without retained flag set.
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%%
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%% - `[topic_match()]`:
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%% A list of topics, topic-filters, or template rendering to match the topic being
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%% subscribed to or published.
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%% For example, `{allow, {username, "Jan"}, publish, ["jan/#"]}` permits Jan to publish
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%% to any topic matching the wildcard pattern "jan/#".
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%% A special tuple `{eq, topic_match()}` is useful to allow or deny the specific wildcard
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%% subscription instead of performing a topic match.
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%% A `topic_match()` can also contain a placeholder rendered with actual value at runtime,
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%% for example, `{allow, all, publish, "${clientid}/#"}` allows all clients to publish to
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%% topics prefixed by their own client ID.
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%%
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%% Supported placeholders are:
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%% - `${cn}`: TLS certificate common name.
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%% - `${clientid}`: The client ID.
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%% - `${username}`: The username.
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%% - `${client_attrs.NAME}`: A client attribute named `NAME`, which can be initialized by
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%% `mqtt.client_attrs_init` config or extended by certain authentication backends.
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%% NOTE: Placeholder is not rendered as empty string if the referencing value is not
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%% foud. For example, `${client_attrs.group}/#` is not rendered as `/#` if the
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%% client does not have a `group` attribute.
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