Oauth2-Proxy implementation and configuration

Architecture

istio-oauth2-proxy.drawio.png

User requests access to an ONAP service via Istio Ingress Gateway, e.g. "https://sdc-fe-ui.simpledemo.onap.org"
The request arrives at the Gateway, which uses the "AuthorizationPolicy" to delegate the authorization to the "external" auth component: oauth2-proxy
"oauth2-proxy" is configured to act as client of the OICD Identity provider "Keycloak"
If the user is not authenticated, it redirects the client to Keycloak Login page
When the user is authenticated successfully with keycloak, the oauth2-proxy receives a JWToken including a "groups" claim for Authorization.
oauth2-proxy evaluates the "groups" against the configured membership (e.g. "admins"). If the “admins” group is found in the JWT groups claim,
oauth2-proxy puts the Token into a Cookie and sends it back to the requesting client - our User.
The User will now be forwarded to the actual application. If the application supports it, we can configure the application to look into the headers
we inject with oauth2-proxy. This allows us to set for example the "prefered_username" or "email" attributes in the application - info we get from the ID token claims.

Configure Istiod

Add the Oauth2 proxy as ExternalAuthProvider via the Mesh-Config (see ONAP on ServiceMesh setup guide):

        meshConfig:
          rootNamespace: istio-config
          extensionProviders:
          - name: oauth2-proxy
            envoyExtAuthzHttp:
              service: oauth2-proxy.default.svc.cluster.local
              port: 80
              timeout: 1.5s
              includeHeadersInCheck: ["authorization", "cookie"]
              headersToUpstreamOnAllow: ["x-forwarded-access-token", "authorization", "path", "x-auth-request-user", "x-auth-request-email", "x-auth-request-access-token"]
              headersToDownstreamOnDeny: ["content-type", "set-cookie"]
              includeAdditionalHeadersInCheck: # Optional for oauth2-proxy to enforce https
                X-Auth-Request-Redirect: 'https://%REQ(:authority)%%REQ(:path)%'

Configure Keycloak

Add Client to ONAP realm

see: https://oauth2-proxy.github.io/oauth2-proxy/docs/configuration/oauth_provider/#keycloak-oidc-auth-provider

Will be part of the REALM imported in the OOM component "platform/keycloak-init" (https://git.onap.org/oom/tree/kubernetes/platform/components/keycloak-init)

Add Client "oauth-proxy":

Client ID: "oauth2-proxy"
Name: "Oauth2 Proxy"
Valid redirect URIs: "*"

Set Credentials:

Client secret: generate and note value

Add Client scope "groups":

with "Group Membership" mapper:

Add "groups" scope to "oatuth2-proxy" client scope:

Create Group "admins" and add user to group:

Configure Oauth2-Proxy

https://oauth2-proxy.github.io/oauth2-proxy/docs/configuration/overview

The ready configured oauth2-proxy will be part of the OOM component "platform/oauth2-proxy"

Create Cookie-Secret

dd if=/dev/urandom bs=32 count=1 2>/dev/null | base64 | tr -d -- '\n' | tr -- '+/' '-_'; echo
CbgXFXDJ16laaCfChtFBpKy1trNEmJZDIjaiaIMLyRA=

Configure oauth2-proxy via values.yaml using "alphaConfig"

  # Oauth client configuration specifics
  config:
    cookieSecret: "CbgXFXDJ16laaCfChtFBpKy1trNEmJZDIjaiaIMLyRA="
    configFile: |-
      email_domains = [ "*" ]        # Restrict to these E-Mail Domains, a wildcard "*" allows any email

  alphaConfig:
    enabled: true
    configData:
      providers:
      - clientID: "oauth2-proxy"
        clientSecret: "5YSOkJz99WHv8enDZPknzJuGqVSerELp"
        id: oidc-istio
        provider: oidc   # We use the generic 'oidc' provider
        loginURL: https://keycloak-ui.simpledemo.onap.org/auth/realms/TAAS/protocol/openid-connect/auth
        #redeemURL: https://keycloak-ui.simpledemo.onap.org/auth/realms/TAAS/protocol/openid-connect/token
        redeemURL: http://keycloak-http.keycloak/auth/realms/TAAS/protocol/openid-connect/token
        profileURL: https://keycloak-ui.simpledemo.onap.org/auth/realms/TAAS/protocol/openid-connect/userinfo
        validateURL: https://keycloak-ui.simpledemo.onap.org/auth/realms/TAAS/protocol/openid-connect/userinfo
        scope: "openid email profile groups"
        allowedGroups:
        - admins # List all groups managed at our your IdP which should be allowed access
        # - infrateam
        # - anothergroup
        oidcConfig:
          emailClaim: email  # Name of the clain in JWT containing the E-Mail
          groupsClaim: groups # Name of the claim in JWT containing the Groups
          userIDClaim: email  # Name of the claim in JWT containing the User ID
          audienceClaims: ["aud"]
          insecureAllowUnverifiedEmail: true
          insecureSkipIssuerVerification: true
          skipDiscovery: true # You can try using the well-knwon endpoint directly for auto discovery, here we won't use it
          issuerURL: https://keycloak-ui.simpledemo.onap.org/auth/realms/TAAS
          jwksURL: http://keycloak-http.keycloak/auth/realms/TAAS/protocol/openid-connect/certs
      upstreamConfig:
        upstreams:
          - id: static_200
            path: /
            static: true
            staticCode: 200
      # Headers that should be added to responses from the proxy
      injectResponseHeaders: # Send this headers in responses from oauth2-proxy
        - name: X-Auth-Request-Preferred-Username
          values:
            - claim: preferred_username
        - name: X-Auth-Request-Email
          values:
            - claim: email

  extraArgs:
    cookie-secure: "false"
    cookie-domain: ".simpledemo.onap.org"    # Replace with your base domain
    cookie-samesite: lax
    cookie-expire: 12h               # How long our Cookie is valid
    auth-logging: true               # Enable / Disable auth logs
    request-logging: true            # Enable / Disable request logs
    standard-logging: true           # Enable / Disable the standart logs
    show-debug-on-error: true        # Disable in production setups
    skip-provider-button: true       # We only have one provider configured (Keycloak)
    silence-ping-logging: true       # Keeps our logs clean
    whitelist-domain: ".simpledemo.onap.org" # Replace with your base domain

Enable AuthN+AuthZ for ONAP SDC-UI

In "London" additional configuration in the OOM values.yaml and _ingress.tpl will be done to generate the needed resource settings.

Here is the manual instruction to enable the Ingress redirection to the oauth2-proxy for SDC-FE.

Create a "AuthorizationPolicy" for sdc-fe

---
kind: AuthorizationPolicy
apiVersion: security.istio.io/v1beta1
metadata:
  name: sdc-fe-ui-authz-oauth2-proxy
  namespace: istio-ingress
spec:
  selector:
    matchLabels:
      istio: ingress
  action: CUSTOM
  provider:
    name: oauth2-proxy
  rules:
    - to:
        - operation:
            hosts: ["sdc-fe-ui.simpledemo.onap.org"]

In case of gateway-api the solution is a bit different, as the selector is different (e.g. when a common gateway is used):

---
kind: AuthorizationPolicy
apiVersion: security.istio.io/v1beta1
metadata:
  name: sdc-fe-ui-authz-oauth2-proxy
  namespace: istio-ingress
spec:
  selector:
    matchLabels:
      istio.io/gateway-name: common-gateway
  action: CUSTOM
  provider:
    name: oauth2-proxy
  rules:
    - to:
        - operation:
            hosts: ["sdc-fe-ui.simpledemo.onap.org"]

Behaviour:

Launch SDC-FE URL :

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