LDAP

LDAP authentication uses an external LDAP server as the authentication data source, which can store a large amount of data and facilitate integration with external device management systems.

Plugin:

emqx_auth_ldap

The emqx_auth_ldap plugin also includes ACL feature, which can be disabled via comments. The current version only supports openldap and does not support Microsoft active directory.

LDAP Configuration

To enable LDAP authentication, you need to configure the following in etc/plugins/emqx_auth_ldap.conf:

# etc/plugins/emqx_auth_ldap.conf

auth.ldap.servers = 127.0.0.1

auth.ldap.port = 389

auth.ldap.pool = 8

## ldap's Binding Distinguished Name (DN)
auth.ldap.bind_dn = cn=root,dc=emqx,dc=io

##     ldap's Binding password
auth.ldap.bind_password = public

## ldap's query timeout
auth.ldap.timeout = 30s

## ldap's device distinguished name
auth.ldap.device_dn = ou=device,dc=emqx,dc=io

## ldap's matching object class
auth.ldap.match_objectclass = mqttUser

## ldap's username attribute type
auth.ldap.username.attributetype = uid

##     ldap's password attribute type
auth.ldap.password.attributetype = userPassword

## TLS Configuration item
## auth.ldap.ssl.certfile = etc/certs/cert.pem
## auth.ldap.ssl.keyfile = etc/certs/key.pem
## auth.ldap.ssl.cacertfile = etc/certs/cacert.pem
## auth.ldap.ssl.verify = verify_peer
## auth.ldap.ssl.fail_if_no_peer_cert = true

LDAP Schema

The data model needs to be configured in the LDAP schema directory. By default, the data model is as follows:

/etc/openldap/schema/emqx.schema

attributetype ( 1.3.6.1.4.1.11.2.53.2.2.3.1.2.3.1.3 NAME 'isEnabled'
EQUALITY booleanMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.7
SINGLE-VALUE
USAGE userApplications )

attributetype ( 1.3.6.1.4.1.11.2.53.2.2.3.1.2.3.4.1 NAME ( 'mqttPublishTopic' 'mpt' )
EQUALITY caseIgnoreMatch
SUBSTR caseIgnoreSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
USAGE userApplications )
attributetype ( 1.3.6.1.4.1.11.2.53.2.2.3.1.2.3.4.2 NAME ( 'mqttSubscriptionTopic' 'mst' )
EQUALITY caseIgnoreMatch
SUBSTR caseIgnoreSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
USAGE userApplications )
attributetype ( 1.3.6.1.4.1.11.2.53.2.2.3.1.2.3.4.3 NAME ( 'mqttPubSubTopic' 'mpst' )
EQUALITY caseIgnoreMatch
SUBSTR caseIgnoreSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
USAGE userApplications )

objectclass ( 1.3.6.1.4.1.11.2.53.2.2.3.1.2.3.4 NAME 'mqttUser'
AUXILIARY
MAY ( mqttPublishTopic $ mqttSubscriptionTopic $ mqttPubSubTopic) )

objectclass ( 1.3.6.1.4.1.11.2.53.2.2.3.1.2.3.2 NAME 'mqttDevice'
SUP top
STRUCTURAL
MUST ( uid )
MAY ( isEnabled ) )

objectclass ( 1.3.6.1.4.1.11.2.53.2.2.3.1.2.3.3 NAME 'mqttSecurity'
SUP top
AUXILIARY
MAY ( userPassword $ userPKCS12 $ pwdAttribute $ pwdLockout ) )

The configuration file slapd.conf was edited with reference of Schema:

/etc/openldap/slapd.conf

include  /etc/openldap/schema/core.schema
include  /etc/openldap/schema/cosine.schema
include  /etc/openldap/schema/inetorgperson.schema
include  /etc/openldap/schema/ppolicy.schema
include  /etc/openldap/schema/emqx.schema

database bdb
suffix "dc=emqx,dc=io"
rootdn "cn=root,dc=emqx,dc=io"
rootpw {SSHA}eoF7NhNrejVYYyGHqnt+MdKNBh4r1w3W

directory       /etc/openldap/data

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