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User Management (SAML)

SSO and RBAC are only officially supported on Kubecost Enterprise plans.

Kubecost supports single sign-on (SSO) and role-based access control (RBAC) with SAML 2.0. Kubecost works with most identity providers including Okta, Auth0, Microsoft Entra ID (formerly Azure AD), PingID, and KeyCloak.

Overview of features

  • User authentication (.Values.saml): SSO provides a simple mechanism to restrict application access internally and externally

  • Pre-defined user roles (.Values.saml.rbac):

    • admin: Full control with permissions to manage users, configure model inputs, and application settings.

    • readonly: User role with read-only permission.

    • editor: Role can change and build alerts and reports, but cannot edit application settings and otherwise functions as read-only.

  • Custom access roles (filters.json): Limit users based on attributes or group membership to view a set of namespaces, clusters, or other aggregations

# EXAMPLE CONFIGURATION
# View setup guides below, for full list of Helm configuration values
saml:
  enabled: true
  secretName: "kubecost-okta"
  idpMetadataURL: "https://your.idp.subdomain.okta.com/app/exk4h09oysB785123/sso/saml/metadata"
  appRootURL: "https://kubecost.your.com"
  authTimeout: 1440
  audienceURI: "https://kubecost.your.com"
  nameIDFormat: "urn:oasis:names:tc:SAML:2.0:attrname-format:basic"
  rbac:
    enabled: true
    groups:
      - name: admin
        enabled: true
        assertionName: "kubecost_group"
        assertionValues:
          - "kubecost_admin"
          - "kubecost_superusers"
      - name: readonly
        enabled: true
        assertionName:  "kubecost_group"
        assertionvalues:
          - "kubecost_users"
    customGroups:
      - assertionName: "kubecost_group"

SAML setup guides

All SAML 2.0 providers also work. The above guides can be used as templates for what is required.

Using the Kubecost API

When SAML SSO is enabled in Kubecost, the following ports will require authentication:

  • service/kubecost-cost-analzyer: ports 9003 and 9090

  • service/kubecost-aggregator: port 9004

curl -L 'http://kubecost.mycompany.com/model/allocation?window=1d' \
  -H 'Cookie: token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJhdWQiOlsiYWRtaW4iLCJncm91cDprdWJlY29zdF9hZG1pbiIsImdyb3VwOmFkbWluQG15Y29tcGFueS5jb20iXSwiZXhwIjoxNjkwMzA2MjYwLjk0OTYyMX0.iLbUuMo0eYhNg0hzv_EEHLIX5Z0du4woPevX3wEnAh8'

For admins, Kubecost additionally exposes unauthenticated APIs:

service/kubecost-cost-analyzer: port 9007

kubectl port-forward service/kubecost-cost-analyzer 9007:9007
curl -L 'localhost:9007/allocation?window=1d&aggregate=namespace'

service/kubecost-aggregator: port 9008

kubectl port-forward service/kubecost-aggregator 9008:9008
curl -L 'localhost:9008/allocation?window=1d&aggregate=namespace'

View your SAML Group

You will be able to view your current SAML Group in the Kubecost UI by selecting Settings from the left navigation, then scrolling to 'SAML Group'. Your access level will be displayed in the 'Current SAML Group' box.

Read-only mode

Kubecost's SAML supports read-only mode. This leverages SAML for authentication, then assigns all authenticated users as read-only users. Note, that this overrides any existing RBAC configurations.

saml:
  enabled: true
readonly: true

Troubleshooting

  1. Disable SAML and confirm the cost-analyzer pod starts. If kubecostAggregator.enabled is unspecified or true in the values.yaml file, confirm that the aggregator pod starts.

  2. If Step 1 is successful, but the pod is crashing or never enters the ready state when SAML is added, it is likely there is panic when loading or parsing SAML data.

    • If kubecostAggregator.enabled is true or unspecified in values.yaml, run kubectl logs statefulsets/kubecost-aggregator and kubectl logs deploy/kubecost-cost-analyzer

    • If kubecostAggregator.enabled is false in values.yaml, run kubectl logs services/kubecost-aggregator and kubectl logs deploy/kubecost-cost-analyzer

If you’re supplying the SAML from the address of an Identity Provider Server, curl the SAML metadata endpoint from within the kubecost pod and ensure that a valid XML EntityDescriptor is being returned and downloaded. The response should be in this format:

$ kubectl exec deployment/kubecost-cost-analyzer -c cost-analyzer-frontend -n kubecost -it -- /bin/sh
$ curl https://dev-elu2z98r.auth0.com/samlp/metadata/c6nY4M37rBP0qSO1IYIqBPPyIPxLS8v2

<EntityDescriptor entityID="urn:dev-elu2z98r.auth0.com" xmlns="urn:oasis:names:tc:SAML:2.0:metadata">
  <IDPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol">
    <KeyDescriptor use="signing">
      <KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
        <X509Data>
         <X509Certificate>...</X509Certificate>
        </X509Data>
      </KeyInfo>
    </KeyDescriptor>
    <SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="https://dev-elu2z98r.auth0.com/samlp/c6nY4M37rBP0qSO1IYIqBPPyIPxLS8v2/logout"/>
    <SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://dev-elu2z98r.auth0.com/samlp/c6nY4M37rBP0qSO1IYIqBPPyIPxLS8v2/logout"/>
    <NameIDFormat>urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress</NameIDFormat>
    <NameIDFormat>urn:oasis:names:tc:SAML:2.0:nameid-format:persistent</NameIDFormat>
    <NameIDFormat>urn:oasis:names:tc:SAML:2.0:nameid-format:transient</NameIDFormat>
    <SingleSignOnService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="https://dev-elu2z98r.auth0.com/samlp/c6nY4M37rBP0qSO1IYIqBPPyIPxLS8v2"/>
    <SingleSignOnService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://dev-elu2z98r.auth0.com/samlp/c6nY4M37rBP0qSO1IYIqBPPyIPxLS8v2"/>
    <Attribute Name="http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri" FriendlyName="E-Mail Address" xmlns="urn:oasis:names:tc:SAML:2.0:assertion"/>
    <Attribute Name="http://schemas.xmlsoap.org/ws/2005/05/identity/claims/givenname" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri" FriendlyName="Given Name" xmlns="urn:oasis:names:tc:SAML:2.0:assertion"/>
    <Attribute Name="http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri" FriendlyName="Name" xmlns="urn:oasis:names:tc:SAML:2.0:assertion"/>
    <Attribute Name="http://schemas.xmlsoap.org/ws/2005/05/identity/claims/surname" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri" FriendlyName="Surname" xmlns="urn:oasis:names:tc:SAML:2.0:assertion"/>
    <Attribute Name="http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri" FriendlyName="Name ID" xmlns="urn:oasis:names:tc:SAML:2.0:assertion"/>
  </IDPSSODescriptor>
</EntityDescriptor>

Common SAML errors

The URL returns a 404 error or returning HTML

Contact your SAML admin to find the URL on your identity provider that serves the raw XML file.

Returning an EntitiesDescriptor instead of an EntityDescriptor

Certain metadata URLs could potentially return an EntitiesDescriptor, instead of an EntityDescriptor. While Kubecost does not currently support using an EntitiesDescriptor, you can instead copy the EntityDescriptor into a new file you create called metadata.xml:

  • Download the XML from the metadata URL into a file called metadata.xml

  • Copy all the attributes from EntitiesDescriptor to the EntityDescriptor that are not present.

  • Remove the <EntitiesDescriptor> tag from the beginning.

  • Remove the </EntitiesDescriptor> from the end of the XML file.

You are left with data in a similar format to the example below:

<EntityDescriptor xmlns="urn:oasis:names:tc:SAML:2.0:metadata" xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" entityID="kubecost-entity-id">
  .... 
</EntityDescriptor>

Then, you can upload the EntityDescriptor to a secret in the same namespace as kubecost and use that directly.

kubectl create secret generic metadata-secret --from-file=./metadata.xml --namespace kubecost

To use this secret, in your helm values set metadataSecretName to the name of the secret created above, and set idpMetadataURL to the empty string:

saml:
  metadataSecretName: “metadata-secret”
  idpMetadataURL: “”

Invalid NameID format

On Keycloak, if you receive an “Invalid NameID format” error, you should set the option “force nameid format” in Keycloak. See Keycloak docs for more details.

Users of CSI driver for storing SAML secret

For users who want to use CSI driver for storing SAML secret, we suggest this guide.

InvalidNameIDPolicy format

From a PingIdentity article:

An alternative solution is to add an attribute called "SAML_SP_NAME_QUALIFIER" to the connection's attribute contract with a TEXT value of the requested SPNameQualifier. When you do this, select the following for attribute name format: urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified

On the PingID side: specify an attribute contract “SAML_SP_NAME_QUALIFIER” with the format urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified.

On the Kubecost side: in your Helm values, set saml.nameIDFormat to the same format set by PingID:

saml:
  nameIDFormat: “urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified”

Make sure audienceURI and appRootURL match the entityID configured within PingFed.

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