redradrat / aws-iam-operator

AWS IAM Operator for Kubernetes

AWS IAM Operator

An operator that enables AWS IAM management via Kubernetes custom resources.

Installation

CRD

The CRDs can easily be applied to the cluster with kubectl:

kubectl kustomize 'github.com/redradrat/aws-iam-operator/config/crd?ref=master' | kubectl apply -f -

or for a specific GITREF (e.g. branch, tag) with:

kubectl kustomize 'github.com/redradrat/aws-iam-operator/config/crd?ref=GITREF' | kubectl apply -f -

Controllers

The controller deployment incl. RBAC & CRD can be applied to the cluster with kubectl:

kubectl kustomize 'github.com/redradrat/aws-iam-operator/config/default?ref=master' | kubectl apply -f -

Controller Manager Options

The controller manager has a couple of input options, which you can set as paramaters on container startup.

...
    spec:
      containers:
      - command:
        - /manager
        args:
        - --enable-leader-election # For HA setup
        - --resource-prefix "testcluster-" # set a prefix to all created AWS resources (e.g. "testcluster-" -> "testcluster-user")
        - --oidc-provider-arn # OPTIONAL: allows setting a oidc provider arn for auto-injecting trust for roles
        image: redradrat/aws-iam-operator:latest
        name: manager

Custom Resources

• Role
• AssumeRolePolicy
• Policy
• PolicyAttachment
• User
• Group

Role

The Role resource abstracts an AWS IAM Role.

Setting an assumeRolePolicy or an assumeRolePolicyRef is mandatory. Creating a ServiceAccount resource is possible via createServiceAccount. The created ServiceAccount includes the EKS OIDC support annotation. When addIRSAPolicy is true, the controller will automatically add the trust policy for the OIDC provider given as controller argument.

apiVersion: aws-iam.redradrat.xyz/v1beta1
kind: Role
metadata:
  name: role-sample
  namespace: default
spec:
  // Either
  assumeRolePolicyRef:
    name: assumerolepolicy-sample
    namespace: default
  // OR
  assumeRolePolicy:
    - effect: "Allow"
      principal:
        "Federated": "blabla"
      actions:
        - "sts:AssumeRoleWithWebIdentity"
      conditions:
        "StringEquals":
          "blablabla": "system:serviceaccount:kube-system:aws-cluster-autoscaler"
  createServiceAccount: true
  addIRSAPolicy: true
  maxSessionDuration: 3600
  // spec.awsRoleName takes precendence over metadata.name
  awsRoleName: the-role

Resulting ServiceAccount:

❯ k get sa role-sample -o yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  annotations:
    eks.amazonaws.com/role-arn: arn:aws:iam::0000000000:role/role-sample
  creationTimestamp: "2020-02-30T00:25:61Z"
  name: role-sample
  namespace: default
  ownerReferences:
  - apiVersion: aws-iam.redradrat.xyz/v1beta1
    blockOwnerDeletion: true
    controller: true
    kind: Role
    name: role-sample
    uid: ...

AssumeRolePolicy

The AssumeRolePolicy is an auxiliary resource for the Role resource. It provides a way to define a single trust policy for multiple roles.

apiVersion: aws-iam.redradrat.xyz/v1beta1
kind: AssumeRolePolicy
metadata:
  name: assumerolepolicy-sample
spec:
  statement:
    - sid: someid
      effect: "Allow"
      principal:
        "Federated": "blabla"
      actions:
        - "xxxx:DescribeSomething"
      resources:
        - "*"
      conditions:
        "StringEquals":
          "aws:SourceIp": "172.0.0.1"

Policy

The Policy resource abstracts an AWS IAM Policy.

For conditions, please check https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_condition_operators.html for valid Operators. For the comparison, only single String-type values are allowed as comparison values. For keys please check out https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_condition-keys.html

apiVersion: aws-iam.redradrat.xyz/v1beta1
kind: Policy
metadata:
  name: policy-sample
spec:
  statement:
    - sid: someid
      effect: "Allow"
      actions:
        - "xxxx:DescribeSomething"
      resources:
        - "*"
      conditions:
        "StringEquals":
          "aws:SourceIp": "172.0.0.1"
  // spec.awsPolicyName takes precendence over metadata.name
  awsPolicyName: the-policy

PolicyAttachment

The Policy resource abstracts the attachment of an AWS IAM Policy to another AWS IAM Resource e.g. Role (in future maybe User, Groups, etc.).

apiVersion: aws-iam.redradrat.xyz/v1beta1
kind: PolicyAttachment
metadata:
  name: policyattachment-sample
spec:
  policy:
    name: policy-sample
    namespace: default
  target:
    type: Role
    name: role-sample
    namespace: default

User

The User resource abstracts an AWS IAM User.

Setting createLoginProfile or an createProgrammaticAccess is optional. Creating a Secret resource, containing Console Login Data, is possible via createLoginProfile. The created secret includes the username and password. Creating a Secret resource, containing a Programmatic Access, is possible via createProgrammaticAccess. The created secret includes the both the Key ID and the Secret.

apiVersion: aws-iam.redradrat.xyz/v1beta1
kind: User
metadata:
  name: user-sample
spec:
  createLoginProfile: true
  createProgrammaticAccess: true

Resulting Secrets:

❯ k get secrets user-sample-login -o yaml
apiVersion: v1
data:
  password: ...
  username: ...
kind: Secret
metadata:
  name: user-sample-login
  namespace: default
  ownerReferences:
  - apiVersion: aws-iam.redradrat.xyz/v1beta1
    blockOwnerDeletion: true
    controller: true
    kind: User
    name: user-sample
    uid: 784d4ff5-377e-4172-a1cf-1b34387a3d6b
type: Opaque

❯ k get secret user-sample-accesskey -o yaml
apiVersion: v1
data:
  id: ...
  secret: ...
kind: Secret
metadata:
  name: user-sample-accesskey
  namespace: default
  ownerReferences:
  - apiVersion: aws-iam.redradrat.xyz/v1beta1
    blockOwnerDeletion: true
    controller: true
    kind: User
    name: user-sample
type: Opaque

Group

The Group resource abstracts an AWS IAM Group.

Adding IAM Users to the group, is possible via users. The referenced users need to be created via this operator.

apiVersion: aws-iam.redradrat.xyz/v1beta1
kind: Group
metadata:
  name: group-sample
spec:
  users:
  - name: user-sample
    namespace: default