»Kubernetes Auth Method (API)

This is the API documentation for the Vault Kubernetes auth method plugin. To learn more about the usage and operation, see the Vault Kubernetes auth method.

This documentation assumes the Kubernetes method is mounted at the /auth/kubernetes path in Vault. Since it is possible to enable auth methods at any location, please update your API calls accordingly.

»Configure Method

The Kubernetes auth method validates service account JWTs and verifies their existence with the Kubernetes TokenReview API. This endpoint configures the public key used to validate the JWT signature and the necessary information to access the Kubernetes API.

»Parameters

• kubernetes_host (string: <required>) - Host must be a host string, a host:port pair, or a URL to the base of the Kubernetes API server.
• kubernetes_ca_cert (string: "") - PEM encoded CA cert for use by the TLS client used to talk with the Kubernetes API. NOTE: Every line must end with a newline: \n
• token_reviewer_jwt (string: "") - A service account JWT used to access the TokenReview API to validate other JWTs during login. If not set, the JWT submitted in the login payload will be used to access the Kubernetes TokenReview API.
• pem_keys (array: []) - Optional list of PEM-formatted public keys or certificates used to verify the signatures of Kubernetes service account JWTs. If a certificate is given, its public key will be extracted. Not every installation of Kubernetes exposes these keys.
• issuer (string: "") - Optional JWT issuer. If no issuer is specified, then this plugin will use kubernetes/serviceaccount as the default issuer.
• disable_iss_validation (bool: false) - Disable JWT issuer validation. Allows to skip ISS validation.
• disable_local_ca_jwt (bool: false) - Disable defaulting to the local CA cert and service account JWT when running in a Kubernetes pod.

»Caveats

If Vault is running in a Kubernetes Pod, the kubernetes_ca_cert and token_reviewer_jwt parameters will automatically default to the local CA cert (/var/run/secrets/kubernetes.io/serviceaccount/ca.crt) and local service account JWT (/var/run/secrets/kubernetes.io/serviceaccount/token). This behavior may be disabled by setting disable_local_ca_jwt to true.

When Vault is running in a non-Kubernetes environment, either kubernetes_ca_cert or pem_keys must be set by the user.

»Sample Payload

{
  "kubernetes_host": "https://192.168.99.100:8443",
  "kubernetes_ca_cert": "-----BEGIN CERTIFICATE-----\n.....\n-----END CERTIFICATE-----",
  "pem_keys": "-----BEGIN CERTIFICATE-----\n.....\n-----END CERTIFICATE-----"
}

{  "kubernetes_host": "https://192.168.99.100:8443",  "kubernetes_ca_cert": "-----BEGIN CERTIFICATE-----\n.....\n-----END CERTIFICATE-----",  "pem_keys": "-----BEGIN CERTIFICATE-----\n.....\n-----END CERTIFICATE-----"}

»Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    http://127.0.0.1:8200/v1/auth/kubernetes/config

$ curl \    --header "X-Vault-Token: ..." \    --request POST \    --data @payload.json \    http://127.0.0.1:8200/v1/auth/kubernetes/config

»Read Config

Returns the previously configured config, including credentials.

»Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    http://127.0.0.1:8200/v1/auth/kubernetes/config

$ curl \    --header "X-Vault-Token: ..." \    http://127.0.0.1:8200/v1/auth/kubernetes/config

»Sample Response

{
  "data":{
    "kubernetes_host": "https://192.168.99.100:8443",
    "kubernetes_ca_cert": "-----BEGIN CERTIFICATE-----.....-----END CERTIFICATE-----",
    "pem_keys": ["-----BEGIN CERTIFICATE-----.....", .....],
    "disable_iss_validation": false,
    "disable_local_ca_jwt": false
  }
}

{  "data":{    "kubernetes_host": "https://192.168.99.100:8443",    "kubernetes_ca_cert": "-----BEGIN CERTIFICATE-----.....-----END CERTIFICATE-----",    "pem_keys": ["-----BEGIN CERTIFICATE-----.....", .....],    "disable_iss_validation": false,    "disable_local_ca_jwt": false  }}

»Create Role

Registers a role in the auth method. Role types have specific entities that can perform login operations against this endpoint. Constraints specific to the role type must be set on the role. These are applied to the authenticated entities attempting to login.

»Parameters

• name (string: <required>) - Name of the role.
• bound_service_account_names (array: <required>) - List of service account names able to access this role. If set to "*" all names are allowed.
• bound_service_account_namespaces (array: <required>) - List of namespaces allowed to access this role. If set to "*" all namespaces are allowed.
• audience (string: "") - Optional Audience claim to verify in the JWT.

• token_ttl (integer: 0 or string: "") - The incremental lifetime for generated tokens. This current value of this will be referenced at renewal time.
• token_max_ttl (integer: 0 or string: "") - The maximum lifetime for generated tokens. This current value of this will be referenced at renewal time.
• token_policies (array: [] or comma-delimited string: "") - List of policies to encode onto generated tokens. Depending on the auth method, this list may be supplemented by user/group/other values.

• token_bound_cidrs (array: [] or comma-delimited string: "") - List of CIDR blocks; if set, specifies blocks of IP addresses which can authenticate successfully, and ties the resulting token to these blocks as well.
• token_explicit_max_ttl (integer: 0 or string: "") - If set, will encode an explicit max TTL onto the token. This is a hard cap even if token_ttl and token_max_ttl would otherwise allow a renewal.
• token_no_default_policy (bool: false) - If set, the default policy will not be set on generated tokens; otherwise it will be added to the policies set in token_policies.
• token_num_uses (integer: 0) - The maximum number of times a generated token may be used (within its lifetime); 0 means unlimited. If you require the token to have the ability to create child tokens, you will need to set this value to 0.
• token_period (integer: 0 or string: "") - The period, if any, to set on the token.
• token_type (string: "") - The type of token that should be generated. Can be service, batch, or default to use the mount's tuned default (which unless changed will be service tokens). For token store roles, there are two additional possibilities: default-service and default-batch which specify the type to return unless the client requests a different type at generation time.

»Sample Payload

{
  "bound_service_account_names": "vault-auth",
  "bound_service_account_namespaces": "default",
  "policies": ["dev", "prod"],
  "max_ttl": 1800000
}

{  "bound_service_account_names": "vault-auth",  "bound_service_account_namespaces": "default",  "policies": ["dev", "prod"],  "max_ttl": 1800000}

»Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    http://127.0.0.1:8200/v1/auth/kubernetes/role/dev-role

$ curl \    --header "X-Vault-Token: ..." \    --request POST \    --data @payload.json \    http://127.0.0.1:8200/v1/auth/kubernetes/role/dev-role

»Read Role

Returns the previously registered role configuration.

»Parameters

• name (string: <required>) - Name of the role.

»Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    http://127.0.0.1:8200/v1/auth/kubernetes/role/dev-role

$ curl \    --header "X-Vault-Token: ..." \    http://127.0.0.1:8200/v1/auth/kubernetes/role/dev-role

»Sample Response

{
  "data": {
    "bound_service_account_names": "vault-auth",
    "bound_service_account_namespaces": "default",
    "max_ttl": 1800000,
    "ttl": 0,
    "period": 0,
    "policies": ["dev", "prod"]
  }
}

{  "data": {    "bound_service_account_names": "vault-auth",    "bound_service_account_namespaces": "default",    "max_ttl": 1800000,    "ttl": 0,    "period": 0,    "policies": ["dev", "prod"]  }}

»List Roles

Lists all the roles that are registered with the auth method.

»Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request LIST \
    http://127.0.0.1:8200/v1/auth/kubernetes/role

$ curl \    --header "X-Vault-Token: ..." \    --request LIST \    http://127.0.0.1:8200/v1/auth/kubernetes/role

»Sample Response

{
  "data": {
    "keys": ["dev-role", "prod-role"]
  }
}

{  "data": {    "keys": ["dev-role", "prod-role"]  }}

»Delete Role

Deletes the previously registered role.

»Parameters

• role (string: <required>) - Name of the role.

»Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request DELETE \
    http://127.0.0.1:8200/v1/auth/kubernetes/role/dev-role

$ curl \    --header "X-Vault-Token: ..." \    --request DELETE \    http://127.0.0.1:8200/v1/auth/kubernetes/role/dev-role

»Login

Fetch a token. This endpoint takes a signed JSON Web Token (JWT) and a role name for some entity. It verifies the JWT signature to authenticate that entity and then authorizes the entity for the given role.

»Sample Payload

• role (string: <required>) - Name of the role against which the login is being attempted.
• jwt (string: <required>) - Signed JSON Web Token (JWT) for authenticating a service account.

»Sample Payload

{
  "role": "dev-role",
  "jwt": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."
}

{  "role": "dev-role",  "jwt": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."}

»Sample Request

$ curl \
    --request POST \
    --data @payload.json \
    http://127.0.0.1:8200/v1/auth/kubernetes/login

$ curl \    --request POST \    --data @payload.json \    http://127.0.0.1:8200/v1/auth/kubernetes/login

»Sample Response

{
  "auth": {
    "client_token": "62b858f9-529c-6b26-e0b8-0457b6aacdb4",
    "accessor": "afa306d0-be3d-c8d2-b0d7-2676e1c0d9b4",
    "policies": ["default"],
    "metadata": {
      "role": "test",
      "service_account_name": "vault-auth",
      "service_account_namespace": "default",
      "service_account_secret_name": "vault-auth-token-pd21c",
      "service_account_uid": "aa9aa8ff-98d0-11e7-9bb7-0800276d99bf"
    },
    "lease_duration": 2764800,
    "renewable": true
  }
}

{  "auth": {    "client_token": "62b858f9-529c-6b26-e0b8-0457b6aacdb4",    "accessor": "afa306d0-be3d-c8d2-b0d7-2676e1c0d9b4",    "policies": ["default"],    "metadata": {      "role": "test",      "service_account_name": "vault-auth",      "service_account_namespace": "default",      "service_account_secret_name": "vault-auth-token-pd21c",      "service_account_uid": "aa9aa8ff-98d0-11e7-9bb7-0800276d99bf"    },    "lease_duration": 2764800,    "renewable": true  }}