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plugin_server_upstreamauthority_vault.md

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Upstream Authority "vault" Plugin

The vault plugin signs intermediate CA certificates for SPIRE using the Vault PKI Engine. The plugin does not support the PublishJWTKey RPC and is therefore not appropriate for use in nested SPIRE topologies where JWT-SVIDs are in use.

Configuration

The plugin accepts the following configuration options:

key type required description default
vault_addr string The URL of the Vault server. (e.g., https://vault.example.com:8443/) ${VAULT_ADDR}
namespace string Name of the Vault namespace. This is only available in the Vault Enterprise. ${VAULT_NAMESPACE}
pki_mount_point string Name of the mount point where PKI secret engine is mounted pki
ca_cert_path string Path to a CA certificate file used to verify the Vault server certificate. Only PEM format is supported. ${VAULT_CACERT}
insecure_skip_verify bool If true, vault client accepts any server certificates false
cert_auth struct Configuration for the Client Certificate authentication method
token_auth struct Configuration for the Token authentication method
approle_auth struct Configuration for the AppRole authentication method
k8s_auth struct Configuration for the Kubernetes authentication method

The plugin supports Client Certificate, Token and AppRole authentication methods.

  • Client Certificate method authenticates to Vault using a TLS client certificate.
  • Token method authenticates to Vault using the token in a HTTP Request header.
  • AppRole method authenticates to Vault using a RoleID and SecretID that are issued from Vault.

The ca_ttl SPIRE Server configurable should be less than or equal to the Vault's PKI secret engine TTL. To configure the TTL value, tune the engine.

e.g.

$ vault secrets tune -max-lease-ttl=8760h pki

The configured token needs to be attached to a policy that has at least the following capabilities:

path "pki/root/sign-intermediate" {
  capabilities = ["update"]
}

Client Certificate Authentication

key type required description default
cert_auth_mount_point string Name of the mount point where TLS certificate auth method is mounted cert
cert_auth_role_name string Name of the Vault role. If given, the plugin authenticates against only the named role. Default to trying all roles.
client_cert_path string Path to a client certificate file. Only PEM format is supported. ${VAULT_CLIENT_CERT}
client_key_path string Path to a client private key file. Only PEM format is supported. ${VAULT_CLIENT_KEY} 
    UpstreamAuthority "vault" {
        plugin_data {
            vault_addr = "https://vault.example.org/"
            pki_mount_point = "test-pki"
            ca_cert_path = "/path/to/ca-cert.pem"
            cert_auth {
                cert_auth_mount_point = "test-tls-cert-auth"
                client_cert_path = "/path/to/client-cert.pem"
                client_key_path  = "/path/to/client-key.pem"
            }
            // If specify the role to authenticate with
            // cert_auth {
            //     cert_auth_mount_point = "test-tls-cert-auth"
            //     cert_auth_role_name = "test"
            //     client_cert_path = "/path/to/client-cert.pem"
            //     client_key_path  = "/path/to/client-key.pem"
            // }
       
            // If specify the key-pair as an environment variable and use the modified mount point
            // cert_auth {
            //    cert_auth_mount_point = "test-tls-cert-auth"
            // }

            // If specify the key-pair as an environment variable and use the default mount point, set the empty structure.
            // cert_auth {}
        }
    }

Token Authentication

key type required description default
token string Token string to set into "X-Vault-Token" header ${VAULT_TOKEN} 
    UpstreamAuthority "vault" {
        plugin_data {
            vault_addr = "https://vault.example.org/"
            pki_mount_point = "test-pki"
            ca_cert_path = "/path/to/ca-cert.pem"
            token_auth {
               token = "<token>"
            }
            // If specify the token as an environment variable, set the empty structure.
            // token_auth {}
        }
    }

AppRole Authentication

key type required description default
approle_auth_mount_point string Name of the mount point where the AppRole auth method is mounted approle
approle_id string An identifier of AppRole ${VAULT_APPROLE_ID}
approle_secret_id string A credential of AppRole ${VAULT_APPROLE_SECRET_ID} 
    UpstreamAuthority "vault" {
        plugin_data {
            vault_addr = "https://vault.example.org/"
            pki_mount_point = "test-pki"
            ca_cert_path = "/path/to/ca-cert.pem"
            approle_auth {
               approle_auth_mount_point = "my-approle-auth"
               approle_id = "<Role ID>" // or specified by environment variables
               approle_secret_id = "<Secret ID>" // or specified by environment variables
            }
            // If specify the approle_id and approle_secret as an environment variable and use the modified mount point
            // approle_auth {
            //    approle_auth_mount_point = "my-approle-auth"
            // }

            // If specify the approle_id and approle_secret as an environment variable and use the default mount point, set the empty structure.
            // approle_auth {}
        }
    }

Kubernetes Authentication

key type required description default
k8s_auth_mount_point string Name of the mount point where the Kubernetes auth method is mounted kubernetes
k8s_auth_role_name string ✔ Name of the Vault role. The plugin authenticates against the named role
token_path string ✔ Path to the Kubernetes Service Account Token to use authentication with the Vault 
    UpstreamAuthority "vault" {
        plugin_data {
            vault_addr = "https://vault.example.org/"
            pki_mount_point = "test-pki"
            ca_cert_path = "/path/to/ca-cert.pem"
            k8s_auth {
               k8s_auth_mount_point = "my-k8s-auth"
               k8s_auth_role_name = "my-role"
               token_path = "/path/to/sa-token"
            }
            
            // If specify role name and use the default mount point and token_path
            // k8s_auth {
            //   k8s_auth_role_name = "my-role"
            // }            
        }
    }