访问控制(ACL)
EMQ 消息服务器通过 ACL(Access Control List) 实现 MQTT 客户端访问控制。
ACL 访问控制规则定义:
允许(Allow)|拒绝(Deny) 谁(Who) 订阅(Subscribe)|发布(Publish) 主题列表(Topics)
MQTT 客户端发起订阅/发布请求时，EMQ 消息服务器的访问控制模块，会逐条匹配 ACL 规则，直到匹配成功为止:
--------- --------- ---------
Client -> | Rule1 | --nomatch--> | Rule2 | --nomatch--> | Rule3 | --> Default
--------- --------- ---------
| | |
match match match
\|/ \|/ \|/
allow | deny allow | deny allow | deny
默认访问控制设置
EMQ 消息服务器默认访问控制，在 etc/emq.conf 中设置:
## ACL nomatch
mqtt.acl_nomatch = allow ## Default ACL File
mqtt.acl_file = etc/acl.conf
ACL 规则定义在 etc/acl.conf，EMQ 启动时加载到内存:
%% Allow 'dashboard' to subscribe '$SYS/#'
{allow, {user, "dashboard"}, subscribe, ["$SYS/#"]}. %% Allow clients from localhost to subscribe any topics
{allow, {ipaddr, "127.0.0.1"}, pubsub, ["$SYS/#", "#"]}. %% Deny clients to subscribe '$SYS#' and '#'
{deny, all, subscribe, ["$SYS/#", {eq, "#"}]}. %% Allow all by default
{allow, all}.
HTTP 插件访问控制
注解
开启 HTTP 插件后，会终结 ACL 链
HTTP API 实现访问控制: https://github.com/emqtt/emq_auth_http
配置 etc/plugins/emq_auth_http.conf, 启用 HTTP 认证插件后:
## 'access' parameter: sub = 1, pub = 2
auth.http.acl_req = http://127.0.0.1:8080/mqtt/acl
auth.http.acl_req.method = get
auth.http.acl_req.params = access=%A,username=%u,clientid=%c,ipaddr=%a,topic=%t
MySQL 插件访问控制
MySQL 插件访问控制，通过 mqtt_acl 表定义 ACL 规则:
CREATE TABLE `mqtt_acl` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`allow` int(1) DEFAULT NULL COMMENT '0: deny, 1: allow',
`ipaddr` varchar(60) DEFAULT NULL COMMENT 'IpAddress',
`username` varchar(100) DEFAULT NULL COMMENT 'Username',
`clientid` varchar(100) DEFAULT NULL COMMENT 'ClientId',
`access` int(2) NOT NULL COMMENT '1: subscribe, 2: publish, 3: pubsub',
`topic` varchar(100) NOT NULL DEFAULT '' COMMENT 'Topic Filter',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8; INSERT INTO mqtt_acl (id, allow, ipaddr, username, clientid, access, topic)
VALUES
(1,1,NULL,'$all',NULL,2,'#'),
(2,0,NULL,'$all',NULL,1,'$SYS/#'),
(3,0,NULL,'$all',NULL,1,'eq #'),
(5,1,'127.0.0.1',NULL,NULL,2,'$SYS/#'),
(6,1,'127.0.0.1',NULL,NULL,2,'#'),
(7,1,NULL,'dashboard',NULL,1,'$SYS/#');
etc/plugins/emq_auth_mysql.conf 配置 ‘acl_query’ 与 ‘acl_nomatch’:
## ACL Query Command
auth.mysql.acl_query = select allow, ipaddr, username, clientid, access, topic from mqtt_acl where ipaddr = '%a' or username = '%u' or username = '$all' or clientid = '%c'
Postgre 插件访问控制
PostgreSQL 插件访问控制，通过 mqtt_acl 表定义 ACL 规则:
CREATE TABLE mqtt_acl (
id SERIAL primary key,
allow integer,
ipaddr character varying(60),
username character varying(100),
clientid character varying(100),
access integer,
topic character varying(100)
); INSERT INTO mqtt_acl (id, allow, ipaddr, username, clientid, access, topic)
VALUES
(1,1,NULL,'$all',NULL,2,'#'),
(2,0,NULL,'$all',NULL,1,'$SYS/#'),
(3,0,NULL,'$all',NULL,1,'eq #'),
(5,1,'127.0.0.1',NULL,NULL,2,'$SYS/#'),
(6,1,'127.0.0.1',NULL,NULL,2,'#'),
(7,1,NULL,'dashboard',NULL,1,'$SYS/#');
etc/plugins/emq_auth_pgsql.conf 设置 ‘acl_query’ 与 ‘acl_nomatch’:
## ACL Query. Comment this query, the acl will be disabled.
auth.pgsql.acl_query = select allow, ipaddr, username, clientid, access, topic from mqtt_acl where ipaddr = '%a' or username = '%u' or username = '$all' or clientid = '%c'
Redis 插件访问控制
Redis Hash 存储一个 MQTT 客户端的访问控制规则:
HSET mqtt_acl:<username> topic1 1
HSET mqtt_acl:<username> topic2 2
HSET mqtt_acl:<username> topic3 3
etc/plugins/emq_auth_redis.conf 配置 ‘acl_cmd’ 与 ‘acl_nomatch’:
## ACL Query Command
auth.redis.acl_cmd = HGETALL mqtt_acl:%u
MongoDB 插件访问控制
MongoDB 数据库创建 mqtt_acl 集合:
{
username: "username",
clientid: "clientid",
publish: ["topic1", "topic2", ...],
subscribe: ["subtop1", "subtop2", ...],
pubsub: ["topic/#", "topic1", ...]
}
mqtt_acl 集合插入数据，例如:
db.mqtt_acl.insert({username: "test", publish: ["t/1", "t/2"], subscribe: ["user/%u", "client/%c"]})
db.mqtt_acl.insert({username: "admin", pubsub: ["#"]})
etc/plugins/emq_auth_mongo.conf 配置 ‘acl_query’ 与 ‘acl_nomatch’:
## acl_query
auth.mongo.acl_query.collection = mqtt_user auth.mongo.acl_query.selector = username=%u