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12-security_iam_rbac.md

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Identity Access Management

The goal: introduction into identity access management

Azure Identity Access Management (IAM)

  1. Azure Active Directory (AAD) - platform to manage and secure identities (human and not):

    • CRUD operations for identities (users and applications)
    • Aggregate identities into groups
    • CRUD operations for groups
    • Manage identities permissions and authentication methods
    • audit

    AAD manages identities and their access rights to AAD itself.

  2. Open AAD single user view and show:

    • sign-ins and main information
    • groups and roles management
    • password and authentication
    • audit

  3. Open a Subscription Access Control view:

    • Check Access: investigate your and others roles within your subscription scope
    • Role Assignments: assign a role to identity or group
    • Roles: view end edit roles. Note, pressing on View link shows all the role permissions.

  4. Role/permission is given to identity within a scope. Assignment involves the following steps:

    • Determine who needs access (e.g. find identity): user, application, group
    • Select role
    • Select scope: subscription, resource group, or exact azure resource (service)
    • Assign the role to the identity within the scope

    Azure role-assignment guide.

Kubernetes Role Based Access Control (RBAC)

Kubernetes uses similar concepts but under slightly different names.

Show all the following steps in kind: kind create cluster.

  1. Kubernetes could integrate with external Auth-providers (for example, AAD)

  2. Identity in Kubernetes: User (human), Service Account (application), Group (aggregation)

  3. Kubernetes scope consist of two parts: namespace and resource type (note, some resource types are not-namespaced)

  4. Kubernetes offers Role (inside namespace only) and ClusterRole (available in the whole cluster).

    • Kubernetes roles coupled with REST api verbs
    • Consist of policies list: which verb is allowed to which resource type
    # get all cluster roles
kubectl get ClusterRole

# describe defaul admin role
kubectl describe ClusterRole admin

  5. Kubernetes can bind Role or ClusterRole to an Identity

    • Role could be bind to an Identity only in the scope of namespace
    • ClusterRole could be bind to an Identity cluster-wide or in one namespace only.
    kubectl get clusterrolebindings

kubectl describe clusterrolebindings ...

  6. There are tools to help navigating RBAC world:

    • native kubectl:
    $ kubectl auth can-i delete namespace
Warning: resource 'namespaces' is not namespace scoped
yes

$ kubectl auth can-i delete ns --as joe
Warning: resource 'namespaces' is not namespace scoped
no