Install Vault-CRD
The following part describes how to install Vault-CRD inside a Cluster with enabled RBAC.
First you have to specify which authentication method you would like to use for Vault-CRD to access Vault. There are two supported methods:
Static Vault Token
Create a file called policy.hcl with the following content:
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path "testpki/issue/testrole" {
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capabilities = ["create", "read", "update"]
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}
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path "secret/*" {
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capabilities = ["read"]
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}
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This defines a new policy that has access to issue new Certificates in a testpki with role testrole and has read access to all secrets in the secret-mountpoint. To write this policy to HashiCorp Vault please run the following command:
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$ vault write sys/policy/testpolicy [email protected]
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The policy is now available in Vault and has the name testpolicy.
Now you can generate the Vault Token, that has this new testpolicy assigned:
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$ vault token create -policy=testpolicy -display-name=testtoken
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Key Value
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--- -----
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token 7b021d51-c4e8-5b28-e944-5dceb1ec5191
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token_accessor 540957b0-0340-2c06-1546-7c28e682983f
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token_duration 768h
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token_renewable true
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token_policies [default testpolicy]
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Now the value of the token-key is the token, that is required to deploy Vault-CRD.
Deploy Vault-CRD
At the end of the deploy/rbac.yaml-file is the Deployment of Vault-CRD with two environment variables. Please change the values of them to your personal settings. e.g:
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- name: KUBERNETES_VAULT_URL
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value: "http://localhost:8080/v1/"
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- name: KUBERNETES_VAULT_TOKEN
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value: "7b021d51-c4e8-5b28-e944-5dceb1ec5191"
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Please don't forget the /v1/ path at the end of the Kubernetes Vault Url
Now you can deploy the rbac file with the following command:
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$ kubectl apply -f https://raw.githubusercontent.com/DaspawnW/vault-crd/master/deploy/rbac.yaml
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Kubernetes Service Account authentication
First please create a Service Account and a ClusterRoleBinding to the Service Account to generate a reviewer JWToken. Therefore please apply the following Kubernetes changes:
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kubectl create serviceaccount vault-auth
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cat <<EOF | kubectl apply -f -
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apiVersion: rbac.authorization.k8s.io/v1beta1
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kind: ClusterRoleBinding
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metadata:
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name: role-tokenreview-binding
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namespace: default
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: ClusterRole
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name: system:auth-delegator
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subjects:
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- kind: ServiceAccount
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name: vault-auth
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namespace: default
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EOF
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Now you can enable the Kubernetes authentication method and use the generated Service Account to configure the reviewer handling. This allows Vault to verify the JWToken used by Vault-CRD to authenticate.
If you work with a Mac please replace base64 -d with base64 -D
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$ vault auth enable kubernetes
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$ vaultSecretName=$(kubectl get serviceaccount vault-auth -o json | jq '.secrets[0].name' -r)
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$ kubectl get secret $vaultSecretName -o json | jq '.data["ca.crt"]' -r | base64 -d > ca.crt
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$ vault write auth/kubernetes/config \
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token_reviewer_jwt="$(kubectl get secret $vaultSecretName -o json | jq .data.token -r | base64 -d)" \
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kubernetes_host=https://127.0.0.1 \
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kubernetes_ca_cert=@ca.crt
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The last step is to generate a policy (please see the Static Vault Token example) and generate a vault role that binds the secret for the Service Account to the policy:
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vault write auth/kubernetes/role/vault-auth \
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bound_service_account_names=vault-crd-serviceaccount \
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bound_service_account_namespaces=vault-crd \
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policies=testpolicy \
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ttl=1h
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Deploy Vault-CRD
At the end of the deploy/rbac.yaml-file is the Deployment of Vault-CRD with two environment variables. By default Vault-CRD is configured to use Static Vault Tokens. Please replace the values with the following information:
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- name: KUBERNETES_VAULT_URL
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value: "http://localhost:8080/v1/"
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- name: KUBERNETES_VAULT_ROLE
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value: "vault-auth"
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- name: KUBERNETES_VAULT_AUTH
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value: "serviceAccount"
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Please don't forget the /v1/ path at the end of the Kubernetes Vault Url
Now you can deploy the rbac file with the following command:
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$ kubectl apply -f https://raw.githubusercontent.com/DaspawnW/vault-crd/master/deploy/rbac.yaml
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Configuration of Vault-CRD
The following environment variables can be changed to configure Vault-CRD
Variable
Description
Default Value
KUBERNETES_VAULT_URL
Please specify here the URL to your Vault installation. Don't forget to set the /v1/ path
KUBERNETES_VAULT_TOKEN
Token with access to the resources that Vault-CRD shares from Vault to Kubernetes.
KUBERNETES_VAULT_ROLE
If you use the Service Account approach for Vault authentication please specify here the Vault role. In the example above it's vault-auth.
KUBERNETES_VAULT_AUTH
Specifies the used authentication method the following values are allowed: token | serviceAccount
token
KUBERNETES_VAULT_PATH
Please specify here the Vault auth path to be used.
kubernetes
KUBERNETES_INTERVAL
Specifies the refresh interval in seconds. In this interval Vault-CRD will check if something has changed in Vault that must be updated in Kubernetes.
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KUBERNETES_JKS_DEFAULT_ALIAS
Specifies the default alias, where the certificate will be placed in a Java Key Store. Can be overwritten by specifying one in the JKS Configuration.
main
KUBERNETES_JKS_DEFAULT_PASSWORD
Default Password that encrypts the Java Key Store. Can be overwritten by specifying one in the JKS Configuration.
changeit
KUBERNETES_JKS_DEFAULT_SECRET_KEY_NAME
Specifies the default key name inside the generated secret where the keystore is placed. Can be overwritten by specifying one in the JKS Configuration.
key.jks
Last modified 2yr ago