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Manage Database Users Using LDAP Authentication

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Considerations

Prerequisites
Add a Database User
Delete a Database User

The Kubernetes Operator supports managing database users for deployments running with TLS and LDAP cluster authentication enabled.

Considerations

The configuration for users authenticated through LDAP relies on the LDAP Query Templates and the mappings that MongoDB establishes.

To learn more, see the following sections in the MongoDB Server documentation:

Supported Authentication Mechanisms

The Kubernetes Operator supports SCRAM, LDAP, and X.509 authentication mechanisms in deployments it creates. In an Kubernetes Operator-created deployment, you cannot use Ops Manager to:

Configure other authentication mechanisms for deployments.
Manage users not using SCRAM, LDAP, or X.509 authentication.

Prerequisites

Before managing database users, you must deploy a replica set or sharded cluster with LDAP enabled. enabled. Optionally, you can enable TLS. To learn more, see Secure a Database Resource.

Add a Database User

Configure `kubectl` to default to your namespace.

If you have not already, run the following command to execute all kubectl commands in the namespace you created.

Note

If you are deploying an Ops Manager resource in a multi-Kubernetes-cluster deployment:

Set the context to the name of the central cluster, such as: kubectl config set context "$MDB_CENTRAL_CLUSTER_FULL_NAME".
Set the --namespace to the same scope that you used for your multi-Kubernetes-cluster deployment, such as: kubectl config --namespace "mongodb".

kubectl config set-context $(kubectl config current-context) --namespace=<metadata.namespace>

Copy the following example CustomResourceDefinition.

---
apiVersion: mongodb.com/v1
kind: MongoDBUser
metadata:
  name: ldap-user-1
spec:
  username: "uid=mdb0,dc=example,dc=org"
  db: "$external"
  mongodbResourceRef:
    name: ldap-replica-set
  roles:
    - db: "admin"
      name: "clusterAdmin"
    - db: "admin"
      name: "readWriteAnyDatabase"
    - db: "admin"
      name: "dbAdminAnyDatabase"
...

Open your preferred text editor and paste the example CustomResourceDefinition into a new text file.

Change the lines for the following parameters, as needed.

Use the following table to guide you through changing the relevant lines in the MongoDB User Resource Specification. For a full list of LDAP user settings, see security settings in the Kubernetes Operator MongoDB resource specification.

Key	Type	Description	Example
`metadata.name`	string	The name of the resource for the MongoDB database user. Resource names must be 44 characters or less.	`ldap-user-1`
`spec.db`	string	The name of the MongoDB database where users will be added. This value must be `$external`.	`$external`
`spec.mongodbResourceRef.name`	string	The name of the MongoDB resource to which this user is associated.	`my-resource`
`spec.opsManager.configMapRef.name`	string	The name of the project containing the MongoDB database where the user will be added. The `spec.cloudManager.configMapRef.name` setting is an alias for this setting and can be used in its place.	`my-project`
`spec.roles.db`	string	The database the role can act on.	`admin`
`spec.roles.name`	string	The name of the role to grant the database user. The role name can be any built-in MongoDB role or custom role that exists in Cloud Manager or Ops Manager.	`readWriteAnyDatabase`
`spec.username`	string	The authenticated username that is mapped to an LDAP Distinguished Name (DN) according to `spec.security.authentication.ldap.userToDNMapping`. The DN must already exist in your LDAP deployment. This username must comply with the RFC 2253 LDAPv3 Distinguished Name standard. `transformed` To learn more, see LDAP Query Templates in the MongoDB Manual.	`uid=mdb0,dc=example,dc=org`

Add any additional roles for the user to the CustomResourceDefinition.

You may grant additional roles to this user using the format defined in the following example:

---
apiVersion: mongodb.com/v1
kind: MongoDBUser
metadata:
  name: ldap-user-1
spec:
  username: "uid=mdb0,dc=example,dc=org"
  db: "$external"
  mongodbResourceRef:
    name: ldap-replica-set
  roles:
  - db: "admin"
    name: "clusterAdmin"
  - db: "admin"
    name: "readWriteAnyDatabase"
  - db: "admin"
    name: "dbAdminAnyDatabase"
...

Create the user.

Invoke the following Kubernetes command to create your database user:

kubectl apply -f <database-user-conf>.yaml

The following examples illustrate the connection string formats that you can use when enabling authentication with LDAP in Kubernetes Operator MongoDB deployments. These examples use the mongodb namespace and a replica set deployment named replica-set-ldap. The examples are similar for sharded clusters.

connectionString.standard:Standard connection string that can connect you to the database as this database user.

mongodb://replica-set-ldap-0-0-svc.mongodb.svc.cluster.local/?connectTimeoutMS=20000&replicaSet=replica-set-ldap&serverSelectionTimeoutMS=20000&ssl=true&authSource=$external

connectionString.standardSrv: DNS seed list connection string that can connect you to the database as this database user.

mongodb+srv://replica-set-ldap-svc.mongodb.svc.cluster.local/?connectTimeoutMS=20000&replicaSet=replica-set-ldap&serverSelectionTimeoutMS=20000&ssl=true&authSource=$external

Using the previously-shown formats, you can connect to the MongoDB database with the MongoDB Shell (mongosh), as in the following example:

mongosh <connection-string> \
  --host <my-replica-set>/web1.example.com \
  --port 30907 \
  --authenticationMechanism PLAIN \
  --username cn=rob,cn=Users,dc=ldaps-01,dc=myteam,dc=com

You can use these credentials to connect to a MongoDB Database Resource from Inside Kubernetes.

View the newly created user in Cloud Manager or Ops Manager.

You can view the newly-created user in Cloud Manager or Ops Manager:

From the Project's Deployment view, click the Security tab.
Click the MongoDB Users nested tab.

Delete a Database User

To delete a database user, pass the metadata.name from the user ConfigMap to the following command:

kubectl delete mdbu <metadata.name>

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