Buzzfeed SSO

Single sign-on for your Kubernetes services using Google OAuth (more providers are welcomed)

• Blogpost
• Quickstart guide
• SSO in Kubernetes with Google Auth
• Repo

This helm chart is heavily inspired in Buzzfeed's example, and provides a way of protecting Kubernetes services that have no authentication layer globally from a single OAuth proxy.

Many of the Kubernetes OAuth solutions require to run an extra container within the pod using oauth2_proxy, but the project seems to not be maintained anymore. The approach presented on this chart allows to have a global OAuth2 Proxy that can protect services even in different namespaces, thanks to Kube DNS.

We use this chart in production at MindDoc for protecting endpoints that have no built-in authentication (or that would require to run inner containers), like Kibana, Prometheus, etc...

Introduction

This chart creates a SSO deployment on a Kubernetes cluster using the Helm package manager.

Prerequisites

• Kubernetes 1.8+ with Beta APIs enabled
• Kube DNS

Installing the Chart

To install the chart with the release name my-release:

helm repo add minddoc https://minddocdev.github.io/charts
helm install --name my-release minddoc/buzzfeed-sso

The command deploys SSO on the Kubernetes cluster using the default configuration. The configuration section lists the parameters that can be configured during installation.

This chart has required variables, see Configuration.

Uninstalling the Chart

To uninstall/delete the my-release deployment:

helm delete --purge my-release

The command removes all the Kubernetes components associated with the chart and deletes the release.

Configuration

The following table lists the configurable parameters of the SSO chart and their default/required values.

Parameter	Description	Default
namespace	namespace to use	default
emailDomain	the sso email domain for authentication	REQUIRED
rootDomain	the parent domain used for protecting your backends	REQUIRED
whitelistedEmails	comma-seperated list of emails which should be whitelisted	OPTIONAL
cluster	the cluster name for SSO	dev
auth.enabled	enable auth component	true
auth.annotations	extra annotations for auth pods	{}
auth.domain	the auth domain used for OAuth callbacks	REQUIRED
auth.extraEnv	extra auth env vars	[]
auth.replicaCount	desired number of auth pods	1
auth.resources	resource limits and requests for auth pods	{ limits: { memory: "256Mi", cpu: "200m" }}
auth.nodeSelector	node selector logic for auth pods	{}
auth.tolerations	resource tolerations for auth pods	{}
auth.affinity	node affinity for auth pods	{}
auth.service.type	type of auth service to create	ClusterIP
auth.service.port	port for the http auth service	80
auth.secret	secrets to be generated randomly with `openssl rand -base64 32	head -c 32`.
auth.ingressEnabled	enable auth ingress.	true
auth.ingressPath	auth ingress path.	/
auth.tls	tls configuration for central sso auth ingress.	{}
auth.customSecret	the secret key to reuse (avoids secret creation via helm)	REQUIRED if auth.secret is not set
proxy.enabled	enable proxy component	true
proxy.annotations	extra annotations for proxy pods	{}
proxy.providerUrlInternal	url for split dns deployments
proxy.extraEnv	extra proxy env vars	[]
proxy.replicaCount	desired number of proxy pods	1
proxy.resources	resource limits and requests for proxy pods	{ limits: { memory: "256Mi", cpu: "200m" }}
proxy.nodeSelector	node selector logic for proxy pods	{}
proxy.tolerations	resource tolerations for proxy pods	{}
proxy.affinity	node affinity for proxy pods	{}
proxy.service.type	type of proxy service to create	ClusterIP
proxy.service.port	port for the http proxy service	80
proxy.secret	secrets to be generated randomly with `openssl rand -base64 32	head -c 32
proxy.customSecret	the secret key to reuse (avoids secret creation via helm)	REQUIRED if proxy.secret is not set
proxy.defaultAllowedEmailDomains	the default allowed domains for upstreams	``
provider.google	the Oauth provider to use (only Google support for now)	REQUIRED
provider.google.adminEmail	the Google admin email	undefined
provider.google.slug	the Google provider slug	oauth2
provider.google.secret	the Google OAuth secrets	REQUIRED if provider.google.customSecret is not set
provider.google.customSecret	the secret key to reuse instead of creating it via helm	REQUIRED if provider.google.secret is not set
image.repository	container image repository	buzzfeed/sso
image.tag	container image tag	v2.1.0
image.pullPolicy	container image pull policy	IfNotPresent
ingress.enabled	set to true to enable the ingress	true
ingress.annotations	ingress load balancer annotations	{}
ingress.extraLabels	extra ingress labels	{}
ingress.hosts	proxied hosts	[]
ingress.tls	tls certificates for the proxied hosts	[]
ingress.gcpBackendConfig	GCP LB backend service configuration	{}
upstreams	configuration of services that use sso	[]

Specify each parameter using the --set key=value[,key=value] argument to helm install. For example,

helm install --name my-release \
  --set key_1=value_1,key_2=value_2 \
  minddoc/buzzfeed-sso

Alternatively, a YAML file that specifies the values for the parameters can be provided while installing the chart. For example,

helm install --name my-release -f values.yaml minddoc/buzzfeed-sso

Tip: This will merge parameters with values.yaml, which does not specify all the required values

Example

NEVER expose your auth.secret, proxy.secret, provider.google.clientId, provider.google.clientSecret and provider.google.serviceAccount. Always keep them in a safe place and do not push them to any repository. As values are merged, you can always generate a different .yaml file. For instance:

# values.yaml
emailDomain: 'email.coolcompany.foo'

rootDomain: 'coolcompany.foo'

auth:
  domain: sso-auth.coolcompany.foo

proxy:
  cluster: dev

google:
  adminEmail: [email protected]

# secrets.yaml
auth:
 secret:
    codeSecret: 'randomSecret1'
    cookieSecret: 'randomSecret2'

proxy:
  secret:
    clientId: 'randomSecret3'
    clientSecret: 'randomSecret4'
    cookieSecret: 'randomSecret6'

google:
  secret:
    clientId: 'googleSecret!'
    clientSecret: 'evenMoreSecret'
    serviceAccount: '{ <json content super secret> }'

Therefore, you could push your own values.yaml to a repo and keep secrets.yaml locally safe, and then install/update the chart:

helm install --name my-release -f values.yaml -f secrets.yaml minddoc/buzzfeed-sso

Alternatively, you can specify your own secret key, if you have already created it in the cluster. The secret should follow the data format defined in secret.yaml (auth and proxy) and google-secret.yaml (google provider).

# values.yaml
emailDomain: 'email.coolcompany.foo'

rootDomain: 'coolcompany.foo'

auth:
  domain: sso-auth.coolcompany.foo
  customSecret: my-sso-auth-secret

proxy:
  cluster: dev
  customSecret: my-sso-proxy-secret

provider:
  google:
    adminEmail: [email protected]
    customSecret: my-sso-google-secret

Updating the Chart

You can update the chart values and trigger a pod reload. If the configmap changes, it will automatically retrieve the new values.

helm upgrade -f values.yaml my-release minddoc/buzzfeed-sso

Contributors

This is the list of contributors to the original incubator/buzfeed-sso chart:

• @anas-aso
• @cameronattard
• @darioblanco
• @dpeckett
• @komljen
• @nicolaspearson
• @namm2
• @omerlh
• @StiviiK
• @tuanahnguyen-ct
• @willejs

New contributors are always welcomed!