Authentication

K10 offers a variety of different ways to secure access to its dashboard and APIs:

Direct Access

When exposing the K10 dashboard externally, it is required that an authentication method is properly configured to secure access. Please note that the token-based authentication is always enabled as a secondary authentication type to let K10 Multi-Cluster Manager components and Veeam Backup & Replication services work with K10.

If accessing the K10 API directly or using kubectl, any authentication method configured for the cluster is acceptable. For more information, see Kubernetes authentication.

Basic Authentication

Basic Authentication allows you to protect access to the K10 dashboard with a user name and password. To enable Basic Authentication, you will first need to generate htpasswd credentials by either using an online tool or via the htpasswd binary found on most systems. Once generated, you need to supply the resulting string with the helm install or upgrade command using the following flags.

--set auth.basicAuth.enabled=true \
--set auth.basicAuth.htpasswd='example:$apr1$qrAVXu.v$Q8YVc50vtiS8KPmiyrkld0'

Alternatively, you can use an existing secret that contains a file created with htpasswd. The secret must be in the K10 namespace. This secret must be created with the key named auth and the value as the password generated using htpasswd in the data field of the secret.

--set auth.basicAuth.enabled=true \
--set auth.basicAuth.secretName=my-basic-auth-secret

Token Authentication

To enable token authentication use the following flag as part of the initial Helm install or subsequent Helm upgrade command.

--set auth.tokenAuth.enabled=true

Once the dashboard is configured, you will be prompted to provide a bearer token that will be used when accessing the dashboard.

../_images/token_login.png

Obtaining Tokens

Token authentication allows using any token that can be verified by the Kubernetes server. For details on the supported token types see Authentication Strategies.

The most common token type that you can use is a service account bearer token.

You can use kubectl to obtain such a token for a service account that you know has the proper permissions.

For example, assuming that K10 is installed in the kasten-io namespace and the ServiceAccount is named my-kasten-sa:

  1. Generate a token with an expiration period (recommended practice):

    $ kubectl --namespace kasten-io create token my-kasten-sa --duration=24h

Note

kubectl client version of 1.24 or higher is required to create a token resource.

  1. Create a secret for the desired service account and fetch a permanent token:

    $ desired_token_secret_name=my-kasten-sa-token

$ kubectl apply --namespace=kasten-io --filename=- <<EOF
apiVersion: v1
kind: Secret
type: kubernetes.io/service-account-token
metadata:
  name: ${desired_token_secret_name}
  annotations:
    kubernetes.io/service-account.name: "my-kasten-sa"
EOF

$ kubectl get secret ${desired_token_secret_name} --namespace kasten-io -ojsonpath="{.data.token}" | base64 --decode

Prior to Kubernetes 1.24, the token must be extracted from a service account's secret:

$ sa_secret=$(kubectl get serviceaccount my-kasten-sa -o jsonpath="{.secrets[0].name}" --namespace kasten-io)

$ kubectl get secret $sa_secret --namespace kasten-io -ojsonpath="{.data.token}{'\n'}" | base64 --decode

If a suitable service account doesn't already exist, one can be created with:

$ kubectl create serviceaccount my-kasten-sa --namespace kasten-io

The new service account will need appropriate role bindings or cluster role bindings in order to use it within K10. To learn more about the necessary K10 permissions, see Authorization.

Token-Based Authentication with AWS EKS

For more details on how to set up token-based authentication with AWS EKS, please follow the following documentation.

Obtaining Tokens with Red Hat OpenShift

An authentication token can be obtained from Red Hat OpenShift via the OpenShift Console by clicking on your user name in the top right corner of the console and selecting Copy Login Command. Alternatively, the token can also be obtained by using the following command:

$ oc whoami --show-token

OAuth Proxy with Red Hat OpenShift (Preview)

The OpenShift OAuth proxy can be used for authenticating access to K10. The following resources have to be deployed in order to setup OAuth proxy in the same namespace as K10.

Configuration

ServiceAccount

Create a ServiceAccount that is to be used by the OAuth proxy deployment

apiVersion: v1
kind: ServiceAccount
metadata:
  name: k10-oauth-proxy
  namespace: kasten-io

Cookie Secret

Create a Secret that is used for encrypting the cookie created by the proxy. The name of the Secret will be used in the configuration of the OAuth proxy.

$ oc --namespace kasten-io create secret generic oauth-proxy-secret \
    --from-literal=session-secret=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c43)

ConfigMap for OpenShift Root CA

Create a ConfigMap annotated with the inject-cabundle OpenShift annotation. The annotation results in the injection of OpenShift's root CA into the ConfigMap. The name of this ConfigMap is used in the configuration of the OAuth proxy.

apiVersion: v1
kind: ConfigMap
metadata:
  annotations:
    service.beta.openshift.io/inject-cabundle: "true"
  name: service-ca
  namespace: kasten-io

NetworkPolicy

Create a NetworkPolicy to allow ingress traffic on port 8080 and port 8083 to to be forwarded to the OAuth proxy service.

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-external-oauth-proxy
  namespace: kasten-io
spec:
  ingress:
  - ports:
    - port: 8083
      protocol: TCP
    - port: 8080
      protocol: TCP
  podSelector:
    matchLabels:
      service: oauth-proxy-svc
  policyTypes:
  - Ingress

Service

Deploy a Service for OAuth proxy. This needs to be annotated with the serving-cert-secret-name annotation. This will result in OpenShift generating a TLS private key and certificate that will be used by the OAuth proxy for secure connections to it. The name of the Secret used with the annotation must match with the name used in the OAuth proxy deployment.

apiVersion: v1
kind: Service
metadata:
  annotations:
    service.beta.openshift.io/serving-cert-secret-name: oauth-proxy-tls-secret
  labels:
    service: oauth-proxy-svc
  name: oauth-proxy-svc
  namespace: kasten-io
spec:
  ports:
  - name: https
    port: 8083
    protocol: TCP
    targetPort: https
  - name: http
    port: 8080
    protocol: TCP
    targetPort: http
  selector:
    service: oauth-proxy-svc
  sessionAffinity: ClientIP
  sessionAffinityConfig:
    clientIP:
      timeoutSeconds: 10800
  type: ClusterIP
status:
  loadBalancer: {}

Deployment

Next, a Deployment for OAuth proxy needs to be created. It is recommended that a separate OpenShift OAuth client be registered for this purpose. The name of the client and its Secret will be used with the --client-id and --client-secret configuration options respectively.

When an OpenShift ServiceAccount was used as the OAuth client, it was observed that the token generated by the proxy did not have sufficient scopes to operate K10. It is therefore not recommended to deploy the proxy using an OpenShift ServiceAccount as the OAuth client.

It is also important to configure the --pass-access-token with the proxy so that it includes the OpenShift token in the X-Forwarded-Access-Token header when forwarding a request to K10.

The --scope configuration must have the user:full scope to ensure that the token generated by the proxy has sufficient scopes for operating K10.

The --upstream configuration must point to the K10 gateway Service.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: oauth-proxy-svc
  namespace: kasten-io
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      service: oauth-proxy-svc
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        service: oauth-proxy-svc
    spec:
      containers:
      - args:
        - --https-address=:8083
        - --http-address=:8080
        - --tls-cert=/tls/tls.crt
        - --tls-key=/tls/tls.key
        - --provider=openshift
        - --client-id=oauth-proxy-client
        - --client-secret=oauthproxysecret
        - --openshift-ca=/etc/pki/tls/cert.pem
        - --openshift-ca=/var/run/secrets/kubernetes.io/serviceaccount/ca.crt
        - --openshift-ca=/service-ca/service-ca.crt
        - --scope=user:full user:info user:check-access user:list-projects
        - --cookie-secret-file=/secret/session-secret
        - --cookie-secure=true
        - --upstream=http://gateway:8000
        - --pass-access-token
        - --redirect-url=http://openshift.example.com/oauth2/callback
        - --email-domain=*
        image: openshift/oauth-proxy:latest
        imagePullPolicy: Always
        name: oauth-proxy
        ports:
        - containerPort: 8083
          name: https
          protocol: TCP
        - containerPort: 8080
          name: http
          protocol: TCP
        resources:
          requests:
            cpu: 10m
            memory: 20Mi
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        volumeMounts:
        - mountPath: /service-ca
          name: service-ca
          readOnly: true
        - mountPath: /secret
          name: oauth-proxy-secret
          readOnly: true
        - mountPath: /tls
          name: oauth-proxy-tls-secret
          readOnly: true
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      serviceAccount: k10-oauth-proxy
      serviceAccountName: k10-oauth-proxy
      terminationGracePeriodSeconds: 30
      volumes:
      - configMap:
          defaultMode: 420
          name: service-ca
        name: service-ca
      - name: oauth-proxy-tls-secret
        secret:
          defaultMode: 420
          secretName: oauth-proxy-tls-secret
      - name: oauth-proxy-secret
        secret:
          defaultMode: 420
          secretName: oauth-proxy-secret

OAuth Client

As mentioned earlier, it is recommended that a new OpenShift OAuth client be. registered.

The redirectURIs has to point to the domain name where K10 is accessible. For example if K10 is available at https://example.com/k10, the redirect URI should be set to https://example.com.

The name of this client must match with the --client-id configuration in the OAuth proxy deployment.

The Secret in this client must match with the --client-secret configuration in the OAuth proxy deployment.

The grantMethod can be either prompt or auto.

kind: OAuthClient
apiVersion: oauth.openshift.io/v1
metadata:
 name: oauth-proxy-client
secret: "oauthproxysecret"
redirectURIs:
 - "http://openshift4-4.aws.kasten.io"
grantMethod: prompt

Forwarding Traffic to the Proxy

Traffic meant for K10 must be forwarded to the OAuth proxy for authentication before it reaches K10. Ensure that ingress traffic on port 80 is forwarded to port 8080 and traffic on port 443 is forwarded to port 8083 of the oauth-proxy-svc Service respectively.

Here is one example of how to forward traffic to the proxy. In this example K10 was deployed with an external gateway Service. The gateway Service's ports were modified to forward traffic like so:

ports:
- name: https
  nodePort: 30229
  port: 443
  protocol: TCP
  targetPort: 8083
- name: http
  nodePort: 31658
  port: 80
  protocol: TCP
  targetPort: 8080
selector:
  service: oauth-proxy-svc

Sample Auth Flow with Screenshots

This section is meant to provide an example of configuring authentication and authorization for operating K10 in an OpenShift cluster to help provide an end to end picture of the Auth flow when working with the OAuth proxy.

  • Okta was configured as the OIDC provider in the OpenShift cluster.

  • An OpenShift group called k10-admins was created and users were added to this group.

  • A cluster role binding was created to bind the k10-admins group to the k10-admin cluster role.

  • A role binding was created to map the k10-admins group to the k10-ns-admin role in the K10 namespace.

  • When the user navigates to the K10 dashboard, the request reaches the proxy. The proxy presents a login screen to the user.

    ../_images/proxy_login.png

  • After clicking the login button, the user is forwarded to the OpenShift login screen. The OpenShift screen will provide the option of selecting kube:admin or the OIDC option if it has been configured in the cluster.

    ../_images/openshift_login.png

  • After clicking on the OIDC option okta in this example, the OIDC provider's login screen is shown.

    ../_images/okta_login.png

  • When authentication with the OIDC provider succeeds, the user is redirected to the K10 dashboard.

    ../_images/dashboard_compliant.png

Additional Documentation

For more information about the OpenShift OAuth proxy, refer to the documentation here.

OpenID Connect Authentication

K10 supports the ability to obtain a token from an OIDC provider and then use that token for authentication. K10 extracts the user's ID from the token and uses Kubernetes User Impersonation with that ID to ensure that user-initiated actions (via the API, CLI or dashboard) are attributed to the authenticated user.

It also supports a refresh token workflow for OIDC, which ensures that authenticated sessions remain active even after access tokens have expired. This feature eliminates the need for frequent re-authentication, thereby enhancing usability. This workflow is disabled by default. You need to enable it using the auth.oidcAuth.refreshTokenSupport helm flag and you might need to do some additional configuration changes to your OIDC provider. Each OIDC provider will have different requirements to enable support for token refresh, please refer to their documentation to make sure it is properly enabled.

When configuring your OIDC provider to support the refresh token workflow, please make sure that it allows the offline_access scope.

Note

The standard OIDC documentation contains detailed descriptions of how token refresh works. No additional configuration is necessary on the K10 side.

Helm Flags for Refresh Token Workflow

The refresh token workflow and K10 UI session can be managed using the two new flags listed below:

1. auth.oidcAuth.refreshTokenSupport: This flag enables or disables the refresh token workflow.

2. auth.oidcAuth.sessionDuration: This flag sets the duration of the K10 UI session when using OIDC authentication. It manages how often users are prompted to re-authenticate.

Cluster Setup

K10 works with your OIDC provider irrespective of whether the Kubernetes cluster is configured with the same OIDC provider, a different OIDC provider, or without any identity providers.

For configuring a cluster with OIDC Tokens see OpenID Connect(OIDC) Token.

For more information on the Kubernetes API configuration options, see Configuring the API Server.

When working with a hosted Kubernetes offering (e.g. GKE, AKS, IKS) there will usually be specific instruction on how to enable this since you may not be able to explicitly configure the Kubernetes API server.

Overall, this portion of the configuration is beyond the scope of the K10 product and is part of the base setup of your Kubernetes cluster.

K10 Setup

Provider Redirect URI Authorizations

As part of the exchange with the OIDC provider, K10 will include a redirect URL in its request to the provider. The provider will return the user to that endpoint after the user has been authenticated. If the OIDC provider that you are using requires that redirects are specifically authorized, you will need to add the redirect URL to the provider's allow-list:

  • For a K10 instance exposed externally use https://<URL to k10 gateway service>/<k10 release name>/auth-svc/v0/oidc/redirect

  • For a K10 instance exposed through kubectl port-forward use http://127.0.0.1:<forwarding port>/<k10 release name>/auth-svc/v0/oidc/redirect

K10 Configuration

The final step is providing K10 with the settings needed to initiate the OIDC workflow and obtain a token.

  • Enable OIDC

    To enable OIDC based authentication use the following flag as part of the initial Helm install or subsequent Helm upgrade command.

    --set auth.oidcAuth.enabled=true

  • OIDC Provider

    This is a URL for OIDC provider. If the Kubernetes API server and K10 share the same OIDC provider, use the same URL that was used when configuring the --oidc-issuer-url option of the API server.

    Use the following Helm option:

    --set auth.oidcAuth.providerURL=<provider URL>

  • Redirect URL

    This is the URL to the K10 gateway service.

    Use https://<URL to k10 gateway service> for K10 exposed externally or http://127.0.0.1:<forwarding port> for K10 exposed through kubectl port-forward.

    Use the following Helm option:

    --set auth.oidcAuth.redirectURL=<gateway URL>

  • OIDC Scopes

    This option defines the scopes that should be requested from the OIDC provider. If the Kubernetes API server and K10 share the same OIDC provider, use the same claims that were requested when configuring the --oidc-username-claim option of the API server.

    Use the following Helm option:

    --set auth.oidcAuth.scopes=<space separated scopes. Quoted if multiple>

  • OIDC Prompt

    If provided, this option specifies whether the OIDC provider must prompt the user for consent or re-authentication. The well known values for this field are select_account, login, consent, and none. Check the OIDC provider's documentation to determine what value is supported. The default value is select_account.

    Use the following Helm option:

    --set auth.oidcAuth.prompt=<prompt>

  • OIDC Client ID

    This option defines the Client ID that is registered with the OIDC Provider. If the Kubernetes API server and K10 share the same OIDC provider, use the same client ID specified when configuring the --oidc-client-id option of the API server.

    Use the following Helm option:

    --set auth.oidcAuth.clientID=<client id string>

  • OIDC Client Secret

    This option defines the Client Secret that corresponds to the Client ID registered. You should have received this value from the OIDC provider when registering the Client ID.

    Use the following Helm option:

    --set auth.oidcAuth.clientSecret=<secret string>

  • OIDC User Name Claim

    This option defines the OpenID claim that has to be used by K10 as the user name. It will be used by K10 for impersonating the user while interacting with the Kubernetes API server for authorization. If not provided, the default claim is sub. This user name must match the User defined in the role bindings described here: K10 RBAC.

    Use the following Helm option:

    --set auth.oidcAuth.usernameClaim=<username claim>

  • OIDC User Name Prefix

    If provided, all usernames will be prefixed with this value. If not provided, username claims other than email are prefixed by the provider URL to avoid clashes. To skip any prefixing, provide the value -.

    Use the following Helm option:

    --set auth.oidcAuth.usernamePrefix=<username prefix>

  • OIDC Group Name Claim

    If provided, this specifies the name of a custom OpenID Connect claim to be used by K10 to identify the groups that a user belongs to. The groups and the username will be used by K10 for impersonating the user while interacting with the Kubernetes API server for authorization.

    To ensure that authorization for the user is successful, one of the groups should match with a Kubernetes group that has the necessary role bindings to allow the user to access K10.

    If the user is an admin user, then the user is most likely set up with all the required permissions for accessing K10 and no new role bindings are necessary.

    To avoid creating new role bindings for non-admin users every time a new user needs to be added to the list of users who will operate K10, consider adding the user to a group such as my-K10-admins in the OIDC provider and add that user to the same group in the Kubernetes cluster. Create role bindings to associate the my-K10-admins group with a cluster role - k10-admin and namespace scoped role - k10-ns-admin (see K10 RBAC for more information about these roles that are created by K10 as part of the installation process). This ensures that once a user is authenticated successfully with the OIDC provider, if the groups information from the provider matches the groups information in Kubernetes, it will authorize the user for accessing K10.

    Note that instead of my-k10-admins, if the user is added to k10:admins in the OIDC provider and to the same group in the Kubernetes cluster, no additional role bindings need to be created since K10 creates them as a part of the installation process.

    For more information about role bindings - K10 RBAC.

    Use the following Helm option:

    --set auth.oidcAuth.groupClaim=<group claim>

  • OIDC Group Prefix

    If provided, all groups will be prefixed with this value to prevent conflicts. To disable the group prefix, either remove this setting or set it to "".

    Use the following Helm option:

    --set auth.oidcAuth.groupPrefix=<group prefix>

Below is a summary of all the options together. These options can be included as part of the initial install command or can be used with a helm upgrade (see more about upgrade at Upgrading K10) command to modify an existing installation.

--set auth.oidcAuth.enabled=true \
--set auth.oidcAuth.providerURL="https://okta.example.com" \
--set auth.oidcAuth.redirectURL="https://k10.example.com/" \
--set auth.oidcAuth.scopes="groups profile email" \
--set auth.oidcAuth.prompt="select_account" \
--set auth.oidcAuth.clientID="client ID" \
--set auth.oidcAuth.clientSecret="client secret" \
--set auth.oidcAuth.usernameClaim="email" \
--set auth.oidcAuth.usernamePrefix="-" \
--set auth.oidcAuth.groupClaim="groups" \
--set auth.oidcAuth.groupPrefix=""

OpenShift Authentication

This mode can be used to authenticate access to K10 using OpenShift's OAuth server.

Create OAuth Client and Client Secret

Before installing or upgrading K10, a Service Account must be created in the namespace where K10 will be installed or upgraded. This Service Account represents an OAuth client that will interact with OpenShift's OAuth server.

If the K10 namespace currently does not exist, it must be created before creating the Service Account in it. Assuming that K10 will be installed in a namespace called kasten-io.

$ kubectl create namespace kasten-io

Assuming K10 is deployed with the release name k10 and the URL for accessing K10 is https://example.com/k10, use the following command to create a Service Account named k10-dex-sa annotated with the serviceaccounts.openshift.io/oauth-redirecturi.dex annotation. This annotation registers the Service Account as an OAuth client with the OpenShift OAuth server.

$ cat > oauth-sa.yaml <<EOF
apiVersion: v1
kind: ServiceAccount
metadata:
  name: k10-dex-sa
  namespace: kasten-io
  annotations:
    serviceaccounts.openshift.io/oauth-redirecturi.dex: <https://example.com/k10/dex/callback>
EOF

$ kubectl create -f oauth-sa.yaml

Note

Ensure that the redirect URI specified in the ServiceAccount annotation uses the correct protocol for the Kasten K10 callback. This typically will be HTTPS, but is dictated by K10 > spec > route > tls > enabled for the OpenShift Operator or --route.tls.enabled flag in Helm

It is necessary to retrieve the Service Account token to be used in K10 > spec > auth > openshift > clientSecret for the Operator config or as a Helm option --auth.openshift.clientSecret. To retrieve this token run the following commands:

Create the Secret that will be mapped with k10-dex-sa Service Account.

$ desired_secret_name="k10-dex-sa-secret"
$ kubectl apply --namespace=kasten-io --filename=- <<EOF
apiVersion: v1
kind: Secret
type: kubernetes.io/service-account-token
metadata:
  name: ${desired_secret_name}
  annotations:
    kubernetes.io/service-account.name: "k10-dex-sa"
EOF

Get the token from the Secret using this command:

$ my_token=$(kubectl -n kasten-io get secret $desired_secret_name -o jsonpath='{.data.token}' | base64 -d)

Install Root CA in K10's namespace

Depending on the OpenShift cluster's configuration, there are two methods to obtain a certificate. If a cluster-wide proxy is not used, then use Method 1 documented below. Otherwise use Method 2 documented below.

Note

If you are using a third-party signed certificate for OpenShift instead of a self-signed certificate, it is important to ensure that the third-party signed certificate and CA are used within the K10 config map.

Method 1: Obtain certificates from the Openshift Ingress and External Load Balancer

In the OpenShift-Ingress-Operator namespace, the Secret Router is responsible for routing encrypted traffic between the client and the target service. This encrypted traffic is usually in the form of HTTPS requests. The Secret Router uses a certificate stored in a Kubernetes Secret object to encrypt the traffic.

Example for self-signed certificates in OpenShift

If using default or self-signed certificates in Openshift, in addition to the Secret Router, the certificate from the Open Shift External Load Balancer is required for K10 to send authentication requests to the OpenShift API server.

$ oc get secret router-ca -n openshift-ingress-operator -o jsonpath='{.data.tls\.crt}' | \
  base64 --decode > custom-ca-bundle.pem
$ oc get secret external-loadbalancer-serving-certkey -n openshift-kube-apiserver -o jsonpath='{.data.tls\.crt}' | \
  base64 --decode >> custom-ca-bundle.pem

Example for thirdy-party signed certificates in OpenShift

If using 3rd party API server certificate in OpenShift, in addition to the Secret Router, the certificate configured for the API server is required for K10 to send authentication requests to the OpenShift API Server

$ oc get secret router-ca -n openshift-ingress-operator -o jsonpath='{.data.tls\.crt}' | \
  base64 --decode > custom-ca-bundle.pem
$ oc get secret -n openshift-config $(oc get apiserver cluster -o jsonpath='{.spec.servingCerts.namedCertificates[*].servingCertificate.name}') -o jsonpath='{.data.tls\.crt}' | \
  base64 --decode >> custom-ca-bundle.pem

Note

Alternatively, the API Server Certificate can be exported from a web browser: https://<Open Shift API Server URI>:6443/.well-known/oauth-authorization-server

Method 2: Obtain certificate from the OpenShift cluster-wide proxy

The OpenShift Proxy is responsible for routing incoming requests to the appropriate service or pod in the cluster. The proxy can perform various functions such as load balancing, SSL termination, URL rewriting, and request forwarding.

$ oc get proxy cluster -n openshift-config -o=jsonpath=‘{.spec.trustedCA.name}’  | base64 --decode > custom-ca-bundle.pem

Note

The name of the Root CA certificate must be custom-ca-bundle.pem

Create a ConfigMap that will contain the certificate

# Choose any name for the ConfigMap
$ oc --namespace kasten-io create configmap custom-ca-bundle-store --from-file=custom-ca-bundle.pem

The Root CA certificate needs to be provided to K10, which is documented in the following section.

Install or Update K10 with OpenShift Authentication

As noted in the Installing K10 on Red Hat OpenShift section, K10 can be installed into an OpenShift cluster either through the RedHat Operator or by using a Helm command. Depending on the selected method, the appropriate K10 configuration should be applied for that method (e.g. if installed using the OpenShift Operator, the configuration must be applied using the OpenShift K10 Operand YAML, not through Helm upgrade).

Red Hat OpenShift Operator Configuration

To enable this mode of authentication if installing or upgrading via the Red Hat OpenShift Operator, enable the following configuration options while installing/upgrading K10. The following section provides detailed explanations for each value, provided by the corresponding helm flag.

../_images/ocp_operator_yaml.png 
apiVersion: apik10.kasten.io/v1alpha1
kind: K10
metadata:
  name: k10
  namespace: kasten-io
spec:
  auth:
    openshift:
      enabled: true
      serviceAccount: "k10-dex-sa"
      clientSecret: "<k10 dex secret>"
      dashboardURL: "<K10's dashboard URL>"
      openshiftURL: "<OpenShift API server's URL>"
      insecureCA: false
  cacertconfigmap:
    name: "custom-ca-bundle-store"
  route:
    enabled: true
    tls:
      enabled: true

Helm-based Configuration

When installing or upgrading K10 using Helm, enable the following Helm options by activating this authentication mode. The following section provides detailed explanations for each Helm value.

$ helm upgrade k10 kasten/k10 --namespace kasten-io --reuse-values \
  --set auth.openshift.enabled=true \
  --set auth.openshift.serviceAccount="service account" \
  --set auth.openshift.clientSecret=${my_token} \
  --set auth.openshift.dashboardURL="<K10's dashboard URL>" \
  --set auth.openshift.openshiftURL="<OpenShift API server's URL>" \
  --set auth.openshift.insecureCA=false \
  --set cacertconfigmap.name=<name-of-the-configmap>

  • Enable OpenShift Authentication

    To enable OpenShift based authentication use the following flag as part of the initial Helm install or subsequent Helm upgrade command.

    --set auth.openshift.enabled=true

  • OpenShift Service Account

    Provide the name of the Service Account created in the Prerequisite section using the following Helm option.

    --set auth.openshift.serviceAccount="k10-dex-sa"

  • OpenShift Service Account Token

    Provide the token corresponding to the Service Account used with the auth.openshift.serviceAccount Helm option. Use the following helm option.

    --set auth.openshift.clientSecret="Token from the service account k10-dex-sa"

  • K10's Dashboard URL

    Provide the URL used for accessing K10's dashboard using the following Helm option.

    --set auth.openshift.dashboardURL="https://<URL to k10 gateway service>/<k10 release name>"

  • OpenShift API Server URL

    Provide the URL for accessing OpenShift's API server using the following Helm option.

    --set auth.openshift.openshiftURL="OpenShift API server's URL"

  • Disabling TLS verification to OpenShift API server

    The default value for this setting is false. This means that connections to the API server are secure by default. The TLS connections to the API server are verified.

    To disable TLS verification, set this value to true.

    Use the following Helm option to enable or disable TLS verification of connections to OpenShift's API server.

    --set auth.openshift.insecureCA=false

  • ConfigMap that will contain the certificate

    Name of the ConfigMap that contains a certificate for a trusted root certificate authority

    --set cacertconfigmap.name=<name-of-the-configmap>

Sample Auth Flow with Screenshots

This section shows screenshots depicting the Auth flow when K10 is installed with OpenShift authentication.

  • Okta was configured as the OIDC provider in the OpenShift cluster.

  • An OpenShift group called k10-admins was created and users were added to this group.

  • A cluster role binding was created to bind the k10-admins group to the k10-admin cluster role.

  • A role binding was created to map the k10-admins group to the k10-ns-admin role in the K10 namespace.

  • When the user navigates to the K10 dashboard, the user is redirected to OpenShift's login screen.

    ../_images/openshift_login.png

  • After clicking on the OIDC option okta in this example, the OIDC provider's login screen is shown.

    ../_images/okta_login.png

  • When authentication with the OIDC provider succeeds, the user is redirected to the K10 dashboard.

    ../_images/dashboard_compliant.png

Active Directory Authentication

This mode can be used to authenticate access to K10 using an Active Directory/LDAP server.

To enable this mode of authentication, enable the following required Helm options while installing/upgrading K10. The required and other optional Helm values are described in more detail in the section below.

$ helm upgrade k10 kasten/k10 --namespace kasten-io --reuse-values \
  --set auth.ldap.enabled=true \
  --set auth.ldap.dashboardURL="K10's dashboard URL" \
  --set auth.ldap.host="host:port" \
  --set auth.ldap.bindDN="DN used for connecting to the server" \
  --set auth.ldap.bindPWSecretName="Secret containing password for connecting to the server" \
  --set auth.ldap.userSearch.baseDN="base DN for user search" \
  --set auth.ldap.userSearch.username="uid" \
  --set auth.ldap.userSearch.idAttr="uid" \
  --set auth.ldap.userSearch.emailAttr="uid" \
  --set auth.ldap.userSearch.nameAttr="uid" \
  --set auth.ldap.userSearch.preferredUsernameAttr="uid" \
  --set auth.ldap.groupSearch.baseDN="base DN for group search" \
  --set auth.ldap.groupSearch.nameAttr="Attribute representing a group's name" \
  --set auth.ldap.groupSearch.userMatchers[0].userAttr="dn" \
  --set auth.ldap.groupSearch.userMatchers[0].groupAttr="member"

Due to the way --set option works if you need to use comma for the LDAP values you have to escape them, for instance :

--set auth.ldap.bindDN="CN=demo tkg\,OU=ServiceAccount\,OU=my-department\,DC=my-company\,DC=demo"

Alternatively, you can define the value in a helm values file without escaping the comma and use the file with the helm install/upgrade command's -f option. Example: helm upgrade k10 kasten/k10 --namespace kasten-io -f path_to_values_file.

K10 Setup

  • Enable Active Directory Authentication

    To enable Active Directory based authentication use the following flag as part of the initial Helm install or subsequent Helm upgrade command.

    --set auth.ldap.enabled=true

  • Restart the Authentication Pod

    If the Helm option auth.ldap.bindPWSecretName has been used to specify the name of the secret that contains the Active Directory bind password, and if this password is modified after K10 has been installed, use this Helm option to restart the Authentication Service's Pod as part of the Helm upgrade command.

    --set auth.ldap.restartPod=true

  • K10's Dashboard URL

    Provide the URL used for accessing K10's dashboard using the following Helm option.

    --set auth.ldap.dashboardURL="https://<URL to k10 gateway service>/<k10 release name>"

  • Active Directory/LDAP host

    Provide the host and optional port of the AD/LDAP server in the form host:port using the following Helm option.

    --set auth.ldap.host="host:port"

  • Disable SSL

    Set this field to true if the Active Directory/LDAP host is not using TLS, using the following Helm option.

    --set auth.ldap.insecureNoSSL="true"

  • Disable SSL verification

    Use the following helm option to set this field to true to disable SSL verification of connections to the Active Directory/LDAP server.

    --set auth.ldap.insecureSkipVerifySSL="true"

  • Start TLS

    When set to true, ldap:// is used to connect to the server followed by creation of a TLS session. When set to false, ldaps:// is used.

    --set auth.ldap.startTLS="true"

  • Bind Distinguished Name

    Use this helm option to provide the Distinguished Name(username) used for connecting to the Active Directory/LDAP host.

    --set auth.ldap.bindDN="cn=admin,dc=example,dc=org"

  • Bind Password

    Use this helm option to provide the password corresponding to the bindDN for connecting to the Active Directory/LDAP host.

    --set auth.ldap.bindPW="password"

  • Bind Password Secret Name

    Use this helm option to provide the name of the secret that contains the password corresponding to the bindDN for connecting to the AD/LDAP host. This option can be used instead of auth.ldap.bindPW. If both have been configured, then this option overrides auth.ldap.bindPW.

    --set auth.ldap.bindPWSecretName="bind-pw-secret"

  • User Search Base Distinguished Name

    Use this helm option to provide the base Distinguished Name to start the Active Directory/LDAP user search from.

    --set auth.ldap.userSearch.baseDN="ou=users,dc=example,dc=org"

  • User Search Filter

    Use this helm option to provide the optional filter to apply when searching the directory for users.

    --set auth.ldap.userSearch.filter="(objectClass=inetOrgPerson)"

  • User Search Username

    Use this helm option to provide the attribute used for comparing user entries when searching the directory.

    --set auth.ldap.userSearch.username="uid"

  • User Search ID Attribute

    Use this helm option to provide the Active Directory/LDAP attribute in a user's entry that should map to the user ID field in a token.

    --set auth.ldap.userSearch.idAttr="uid"

  • User Search email Attribute

    Use this helm option to provide the Active Directory/LDAP attribute in a user's entry that should map to the email field in a token.

    --set auth.ldap.userSearch.emailAttr="uid"

  • User Search Name Attribute

    Use this helm option to provide the Active Directory/LDAP attribute in a user's entry that should map to the name field in a token.

    --set auth.ldap.userSearch.nameAttr="uid"

  • User Search Preferred Username Attribute

    Use this helm option to provide the Active Directory/LDAP attribute in a user's entry that should map to the preferred_username field in a token.

    --set auth.ldap.userSearch.preferredUsernameAttr="uid"

  • Group Search Base Distinguished Name

    Use this helm option to provide the base Distinguished Name to start the AD/LDAP group search from.

    --set auth.ldap.groupSearch.baseDN="ou=users,dc=example,dc=org"

  • Group Search Filter

    Use this helm option to provide the optional filter to apply when searching the directory for groups.

    --set auth.ldap.groupSearch.filter="(objectClass=groupOfNames)"

  • Group Search Name Attribute

    Use this helm option to provide the Active Directory/LDAP attribute that represents a group's name in the directory.

    --set auth.ldap.groupSearch.nameAttr="cn"

  • Group Search User Matchers

    The userMatchers helm option represents a list. Each entry in this list consists of a pair of fields named userAttr and groupAttr. This helm option is used to find users in the directory based on the condition that, the user entry's attribute represented by userAttr must match a group entry's attribute represented by groupAttr.

    As an example, suppose a group's definition in the directory looks like the one below:

    # k10admins, users, example.org
dn: cn=k10admins,ou=users,dc=example,dc=org
cn: k10admins
objectClass: groupOfNames
member: cn=user1@kasten.io,ou=users,dc=example,dc=org
member: cn=user2@kasten.io,ou=users,dc=example,dc=org
member: cn=user3@kasten.io,ou=users,dc=example,dc=org

    Suppose user1's entry in the directory looks like the one below:

    # user1@kasten.io, users, example.org
dn: cn=user1@kasten.io,ou=users,dc=example,dc=org
cn: User1
cn: user1@kasten.io
sn: Bar1
objectClass: inetOrgPerson
objectClass: posixAccount
objectClass: shadowAccount
userPassword:: < Removed >
uid: user1@kasten.io
uidNumber: 1000
gidNumber: 1000
homeDirectory: /home/user1@kasten.io

    For the example directory entries above, a suitable configuration for the userMatchers would be like the one below. If the dn field of a user matches the member field in a group, then the user's record will be returned by the Active Directory/LDAP server.

    --set auth.ldap.groupSearch.userMatchers[0].userAttr="dn"
--set auth.ldap.groupSearch.userMatchers[0].groupAttr="member"

Sample Auth Flow with Screenshots

This section shows screenshots depicting the Auth flow when K10 is installed with Active Directory authentication.

  • AWS Simple AD service was setup as the Active Directory service used by K10 in a Kubernetes cluster deployed in Digital Ocean.

  • A user named productionadmin was created in the Simple AD service and added to a group named k10admins.

  • A cluster role binding was created to bind the k10admins group to the k10-admin cluster role.

  • A role binding was created to bind the k10admins group to the k10-ns-admin role in the K10 namespace.

  • When the user navigates to the K10 dashboard, the user is redirected to the Active Directory/LDAP login screen.

    ../_images/ldap_login.png

  • When authentication with the Active Directory/LDAP server succeeds, the user is redirected to the K10 dashboard.

    ../_images/dashboard_compliant.png

Troubleshooting

Common Name Certificates

Certificates that have a Common Name (CN), but no Subject Alternate Name (SAN) may cause an error to be displayed: "x509: certificate relies on legacy Common Name field, use SANs instead".

This is because the Common Name field of a certificate is no longer used by some clients to verify DNS names. For more information, see RFC 6125, Section 6.4.4.

../_images/ldap_x509_common_name_error.png

To correct this error, the certificate must be updated to include the DNS name in the SAN field of the certificate.

If necessary, it is possible to run an older version of Dex until the certificate can be updated with a proper SAN.

Warning

Running with an older version of Dex is not a recommended configuration!

Older images are missing critical security patches and should only be used as a temporary workaround until a new certificate can be provisioned.

To run with an older version of Dex, use the following values:

--set dexImage.registry=quay.io \
--set dexImage.repository=dexidp \
--set dexImage.image=dex \
--set dexImage.tag=v2.25.0 \
--set dexImage.frontendDir=/web

Other Authentication Options

Group Allow List

When using authentication modes such as Active Directory, OpenShift or OIDC, after a user has successfully authenticated with the authentication provider, K10 creates a JSON Web Token(JWT) that contains information returned by the provider. This includes the groups that a user is a member of.

If the number of groups returned by an authentication provider results in a token whose size is more than 4KB, the token gets dropped and is not returned to the dashboard. This results in a failed login attempt.

The helm option below can be used to reduce the number of groups in the JWT. It represents a list of groups that are allowed admin access to K10's dashboard. These groups will be appended to the list of subjects in the default ClusterRoleBinding that is created when K10 is installed to bind them to the ClusterRole named k10-admin. If the namespace where K10 was installed is kasten-io and the K10 ServiceAccount in that namespace is named k10-k10, then the ClusterRoleBinding would be named kasten-io-k10-k10-admin.

--set auth.groupAllowList[0]="group1"
--set auth.groupAllowList[1]="group2"

K10 Admin Groups

Suppose the auth.groupAllowList helm option is defined with a list of groups as "admin-group1, basic-group1, basic-group2" to restrict the number of groups included in the JSON Web Token, and if the group named admin-group1 is the only group that needs to be setup with admin level access to K10, then use the helm option below.

Instead of the groups in auth.groupAllowList, only the groups in auth.k10AdminGroups will be appended to the list of subjects in the default ClusterRoleBinding that is created when K10 is installed to bind them to the ClusterRole named k10-admin. If the namespace where K10 was installed is kasten-io and the K10 ServiceAccount in that namespace is named k10-k10, then the ClusterRoleBinding would be named kasten-io-k10-k10-admin.

--set auth.k10AdminGroups[0]="group1"
--set auth.k10AdminGroups[1]="group2"

K10 Admin Users

This helm option can be used to define a list of users who are granted admin level access to K10's dashboard. The users in auth.k10AdminUsers will be appended to the list of subjects in the default ClusterRoleBinding that is created when K10 is installed to bind them to the ClusterRole named k10-admin. If the namespace where K10 was installed is kasten-io and the K10 ServiceAccount in that namespace is named k10-k10, then the ClusterRoleBinding would be named kasten-io-k10-k10-admin.

--set auth.k10AdminUsers[0]="user1"
--set auth.k10AdminUsers[1]="user2"