🥇Fa'amaoni i Kubernetes fa'aaoga GitHub OAuth ma Dex

Ou te tuʻuina atu ia te oe se aʻoaʻoga mo le faʻatupuina o avanoa i se vaega Kubernetes e faʻaaoga ai Dex, dex-k8s-authenticator ma GitHub.

Fa'alotoifale meme mai le gagana Rusia Kubernetes talatalanoaga i totonu uālesi

Faatomuaga

Matou te fa'aogaina Kubernetes e fatu ai si'osi'omaga malosi mo le atina'e ma le 'au QA. O lea matou te mananaʻo e tuʻuina atu ia i latou le avanoa i le fuifui mo le dashboard ma kubectl. E le pei o OpenShift, vanilla Kubernetes e leai se faʻamaoniga faʻale-aganuʻu, o lea matou te faʻaogaina meafaigaluega lona tolu mo lenei mea.

I lenei faatulagaga matou te faʻaaogaina:

dex-k8s-faamaoni - 'upega tafaʻilagi mo le fausiaina o kubectl config
Dex - OpenID Connect kamupani
GitHub - ona o loʻo matou faʻaaogaina GitHub i la matou kamupani

Na matou taumafai e faʻaoga Google OIDC, ae paga lea na matou le manuia e amata i latou i vaega, o lea o le tuʻufaʻatasia ma GitHub e fetaui lelei ma i matou. A aunoa ma le fa'afanua vaega, o le a le mafai ona faia ni faiga fa'avae RBAC e fa'atatau i vaega.

O lea la, e fa'afefea ona galue a tatou faiga fa'atagaina Kubernetes i se fa'aaliga vaaia:

Faiga fa'atagaina

O nisi faʻamatalaga ma faʻamatalaga i lea itu:

O lo'o fa'aoga le tagata fa'aoga i le dex-k8s-authenticator (login.k8s.example.com)
dex-k8s-authenticator lafo atu le talosaga ia Dex (dex.k8s.example.com)
Dex toe fa'asaga i le GitHub login page
GitHub fa'atupuina fa'amatalaga fa'atagaina talafeagai ma toe fa'afo'i atu i Dex
Dex pasi fa'amatalaga maua ile dex-k8s-authenticator
E maua e le tagata fa'aoga se fa'ailoga OIDC mai GitHub
dex-k8s-authenticator faʻaopoopo le faʻailoga i le kubeconfig
Kubectl pasi le faailoga ile KubeAPIServer
KubeAPIServer toe fa'afo'i avanoa ile kubectl e fa'atatau ile fa'ailoga ua pasia
E maua e le tagata fa'aoga le avanoa mai le kubectl

Galuega sauniuni

Ioe, ua uma ona fa'apipi'i le fa'aputuga Kubernetes (k8s.example.com), ma e sau foʻi ma HELM na faʻapipiʻiina muamua. E iai foʻi la matou faʻalapotopotoga i le GitHub (super-org).
Afai e leai sau HELM, fa'apipi'i faigofie lava.

Muamua e tatau ona tatou seti GitHub.

Alu i le itulau fa'atulagaina o fa'alapotopotoga, (https://github.com/organizations/super-org/settings/applications) ma fai se talosaga fou (Authorized OAuth App):

Fausia se talosaga fou ile GitHub

Faatumu fanua i URL talafeagai, mo se faʻataʻitaʻiga:

Itulauaiga URL: https://dex.k8s.example.com
Fa'atagaga toe fo'i i tua URL: https://dex.k8s.example.com/callback

Faʻaeteete i soʻotaga, e taua le aua neʻi leiloa faʻamaʻi.

I le tali atu i se pepa faʻatumu, GitHub o le a gaosia Client ID и Client secret, teu i se nofoaga saogalemu, o le a aoga ia i tatou (mo se faataitaiga, tatou te faaaogaina Vault mo le teuina o mealilo):

Client ID: 1ab2c3d4e5f6g7h8
Client secret: 98z76y54x32w1

Saunia faamaumauga DNS mo subdomains login.k8s.example.com и dex.k8s.example.com, faʻapea foʻi ma tusi faamaonia SSL mo le ulufale.

Sei o tatou faia ni tusi faamaonia SSL:

cat <<EOF | kubectl create -f -
apiVersion: certmanager.k8s.io/v1alpha1
kind: Certificate
metadata:
  name: cert-auth-dex
  namespace: kube-system
spec:
  secretName: cert-auth-dex
  dnsNames:
    - dex.k8s.example.com
  acme:
    config:
    - http01:
        ingressClass: nginx
      domains:
      - dex.k8s.example.com
  issuerRef:
    name: le-clusterissuer
    kind: ClusterIssuer
---
apiVersion: certmanager.k8s.io/v1alpha1
kind: Certificate
metadata:
  name: cert-auth-login
  namespace: kube-system
spec:
  secretName: cert-auth-login
  dnsNames:
    - login.k8s.example.com
  acme:
    config:
    - http01:
        ingressClass: nginx
      domains:
      - login.k8s.example.com
  issuerRef:
    name: le-clusterissuer
    kind: ClusterIssuer
EOF
kubectl describe certificates cert-auth-dex -n kube-system
kubectl describe certificates cert-auth-login -n kube-system

ClusterIssuer ma le suafa le-clusterissuer e tatau ona i ai, ae afai e leai, fa'aaoga le HELM:

helm install --namespace kube-system -n cert-manager stable/cert-manager
cat << EOF | kubectl create -f -
apiVersion: certmanager.k8s.io/v1alpha1
kind: ClusterIssuer
metadata:
  name: le-clusterissuer
  namespace: kube-system
spec:
  acme:
    server: https://acme-v02.api.letsencrypt.org/directory
    email: [email protected]
    privateKeySecretRef:
      name: le-clusterissuer
    http01: {}
EOF

KubeAPISserver configuration

Mo le kubeAPIServer e galue, e te manaʻomia le faʻatulagaina o le OIDC ma faʻafouina le fuifui:

kops edit cluster
...
  kubeAPIServer:
    anonymousAuth: false
    authorizationMode: RBAC
    oidcClientID: dex-k8s-authenticator
    oidcGroupsClaim: groups
    oidcIssuerURL: https://dex.k8s.example.com/
    oidcUsernameClaim: email
kops update cluster --yes
kops rolling-update cluster --yes

Matou te faʻaaogaina kops mo le faʻapipiʻiina o fuifui, ae e tutusa lava le aoga mo isi pule o fuifui.

Dex configuration ma le dex-k8s-authenticator

Mo Dex e galue, e tatau ona i ai sau tusi faamaonia ma se ki mai le matai Kubernetes, seʻi o tatou maua mai iina:

sudo cat /srv/kubernetes/ca.{crt,key}
-----BEGIN CERTIFICATE-----
AAAAAAAAAAABBBBBBBBBBCCCCCC
-----END CERTIFICATE-----
-----BEGIN RSA PRIVATE KEY-----
DDDDDDDDDDDEEEEEEEEEEFFFFFF
-----END RSA PRIVATE KEY-----

Seʻi o tatou faʻapipiʻi le fale teu oloa dex-k8s-authenticator:

git clone [email protected]:mintel/dex-k8s-authenticator.git
cd dex-k8s-authenticator/

I le faʻaaogaina o faila faʻatau, e mafai ona matou fetuutuunai fetuunai fesuiaiga mo a matou HELM siata.

Sei o tatou faʻamatalaina le faʻatulagaga mo Dex:

cat << EOF > values-dex.yml
global:
  deployEnv: prod
tls:
  certificate: |-
    -----BEGIN CERTIFICATE-----
    AAAAAAAAAAABBBBBBBBBBCCCCCC
    -----END CERTIFICATE-----
  key: |-
    -----BEGIN RSA PRIVATE KEY-----
    DDDDDDDDDDDEEEEEEEEEEFFFFFF
    -----END RSA PRIVATE KEY-----
ingress:
  enabled: true
  annotations:
    kubernetes.io/ingress.class: nginx
    kubernetes.io/tls-acme: "true"
  path: /
  hosts:
    - dex.k8s.example.com
  tls:
    - secretName: cert-auth-dex
      hosts:
        - dex.k8s.example.com
serviceAccount:
  create: true
  name: dex-auth-sa
config: |
  issuer: https://dex.k8s.example.com/
  storage: # https://github.com/dexidp/dex/issues/798
    type: sqlite3
    config:
      file: /var/dex.db
  web:
    http: 0.0.0.0:5556
  frontend:
    theme: "coreos"
    issuer: "Example Co"
    issuerUrl: "https://example.com"
    logoUrl: https://example.com/images/logo-250x25.png
  expiry:
    signingKeys: "6h"
    idTokens: "24h"
  logger:
    level: debug
    format: json
  oauth2:
    responseTypes: ["code", "token", "id_token"]
    skipApprovalScreen: true
  connectors:
  - type: github
    id: github
    name: GitHub
    config:
      clientID: $GITHUB_CLIENT_ID
      clientSecret: $GITHUB_CLIENT_SECRET
      redirectURI: https://dex.k8s.example.com/callback
      orgs:
      - name: super-org
        teams:
        - team-red
  staticClients:
  - id: dex-k8s-authenticator
    name: dex-k8s-authenticator
    secret: generatedLongRandomPhrase
    redirectURIs:
      - https://login.k8s.example.com/callback/
envSecrets:
  GITHUB_CLIENT_ID: "1ab2c3d4e5f6g7h8"
  GITHUB_CLIENT_SECRET: "98z76y54x32w1"
EOF

Ma mo dex-k8s-authenticator:

cat << EOF > values-auth.yml
global:
  deployEnv: prod
dexK8sAuthenticator:
  clusters:
  - name: k8s.example.com
    short_description: "k8s cluster"
    description: "Kubernetes cluster"
    issuer: https://dex.k8s.example.com/
    k8s_master_uri: https://api.k8s.example.com
    client_id: dex-k8s-authenticator
    client_secret: generatedLongRandomPhrase
    redirect_uri: https://login.k8s.example.com/callback/
    k8s_ca_pem: |
      -----BEGIN CERTIFICATE-----
      AAAAAAAAAAABBBBBBBBBBCCCCCC
      -----END CERTIFICATE-----
ingress:
  enabled: true
  annotations:
    kubernetes.io/ingress.class: nginx
    kubernetes.io/tls-acme: "true"
  path: /
  hosts:
    - login.k8s.example.com
  tls:
    - secretName: cert-auth-login
      hosts:
        - login.k8s.example.com
EOF

Faʻapipiʻi le Dex ma le dex-k8s-authenticator:

helm install -n dex --namespace kube-system --values values-dex.yml charts/dex
helm install -n dex-auth --namespace kube-system --values values-auth.yml charts/dex-k8s-authenticator

Sei o tatou siaki le gaioiga o auaunaga (Dex e tatau ona toe faafoi le code 400, ma le dex-k8s-authenticator e tatau ona toe faafoi le code 200):

curl -sI https://dex.k8s.example.com/callback | head -1
HTTP/2 400
curl -sI https://login.k8s.example.com/ | head -1
HTTP/2 200

RBAC fa'atulagaina

Matou te fatuina se ClusterRole mo le vaega, i la matou tulaga ma le faitau-naʻo avanoa:

cat << EOF | kubectl create -f -
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: cluster-read-all
rules:
  -
    apiGroups:
      - ""
      - apps
      - autoscaling
      - batch
      - extensions
      - policy
      - rbac.authorization.k8s.io
      - storage.k8s.io
    resources:
      - componentstatuses
      - configmaps
      - cronjobs
      - daemonsets
      - deployments
      - events
      - endpoints
      - horizontalpodautoscalers
      - ingress
      - ingresses
      - jobs
      - limitranges
      - namespaces
      - nodes
      - pods
      - pods/log
      - pods/exec
      - persistentvolumes
      - persistentvolumeclaims
      - resourcequotas
      - replicasets
      - replicationcontrollers
      - serviceaccounts
      - services
      - statefulsets
      - storageclasses
      - clusterroles
      - roles
    verbs:
      - get
      - watch
      - list
  - nonResourceURLs: ["*"]
    verbs:
      - get
      - watch
      - list
  - apiGroups: [""]
    resources: ["pods/exec"]
    verbs: ["create"]
EOF

Sei o tatou faia se fa'atulagaga mo ClusterRoleBinding:

cat <<EOF | kubectl create -f -
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: dex-cluster-auth
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-read-all
subjects:
  kind: Group
  name: "super-org:team-red"
EOF

O lea ua matou sauni mo su'ega.

Tests

Alu i le itulau saini (https://login.k8s.example.com) ma saini e faʻaaoga lau tala GitHub:

Itulau ulufale

Fa'asinomaga itulau ulufale ile GitHub

Mulimuli i fa'atonuga na faia e maua ai le avanoa

A maeʻa kopi-pasi mai le itulau uepi, e mafai ona matou faʻaogaina le kubectl e faʻatautaia a matou punaoa faʻapipiʻi:

kubectl get po
NAME                READY   STATUS    RESTARTS   AGE
mypod               1/1     Running   0          3d

kubectl delete po mypod
Error from server (Forbidden): pods "mypod" is forbidden: User "[email protected]" cannot delete pods in the namespace "default"

Ma e aoga, o tagata GitHub uma i la matou faʻalapotopotoga e mafai ona vaʻaia punaoa ma faʻaoga i totonu o pods, ae leai ni a latou aia e sui ai.

puna: www.habr.com

Fa'amaoni i Kubernetes fa'aaoga GitHub OAuth ma Dex