80 lines
3.0 KiB
Go
80 lines
3.0 KiB
Go
// Copyright 2021 the Pinniped contributors. All Rights Reserved.
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
|
|
package impersonator
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
v1 "k8s.io/api/core/v1"
|
|
"sigs.k8s.io/yaml"
|
|
)
|
|
|
|
type Mode string
|
|
|
|
const (
|
|
// Explicitly enable the impersonation proxy.
|
|
ModeEnabled Mode = "enabled"
|
|
|
|
// Explicitly disable the impersonation proxy.
|
|
ModeDisabled Mode = "disabled"
|
|
|
|
// Allow the proxy to decide if it should be enabled or disabled based upon the cluster in which it is running.
|
|
ModeAuto Mode = "auto"
|
|
)
|
|
|
|
const (
|
|
ConfigMapDataKey = "config.yaml"
|
|
)
|
|
|
|
// When specified, both CertificateAuthoritySecretName and TLSSecretName are required. They may be specified to
|
|
// both point at the same Secret or to point at different Secrets.
|
|
type TLSConfig struct {
|
|
// CertificateAuthoritySecretName contains the name of a namespace-local Secret resource. The corresponding Secret
|
|
// must contain a key called "ca.crt" whose value is the CA certificate which clients should trust when connecting
|
|
// to the impersonation proxy.
|
|
CertificateAuthoritySecretName string `json:"certificateAuthoritySecretName"`
|
|
|
|
// TLSSecretName contains the name of a namespace-local Secret resource. The corresponding Secret must be of type
|
|
// "kubernetes.io/tls" and contain keys called "tls.crt" and "tls.key" whose values are the TLS certificate and
|
|
// private key that will be used by the impersonation proxy to serve its endpoints.
|
|
TLSSecretName string `json:"tlsSecretName"`
|
|
}
|
|
|
|
type Config struct {
|
|
// Enable or disable the impersonation proxy. Optional. Defaults to ModeAuto.
|
|
Mode Mode `json:"mode,omitempty"`
|
|
|
|
// Used when creating TLS certificates and for clients to discover the endpoint. Optional. When not specified, if the
|
|
// impersonation proxy is started, then it will automatically create a LoadBalancer Service and use its ingress as the
|
|
// endpoint.
|
|
//
|
|
// When specified, it may be a hostname or IP address, optionally with a port number, of the impersonation proxy
|
|
// for clients to use from outside the cluster. E.g. myhost.mycompany.com:8443. Clients should assume that they should
|
|
// connect via HTTPS to this service.
|
|
Endpoint string `json:"endpoint,omitempty"`
|
|
|
|
// The TLS configuration of the impersonation proxy's endpoints. Optional. When not specified, a CA and TLS
|
|
// certificate will be automatically created based on the Endpoint setting.
|
|
TLS *TLSConfig `json:"tls,omitempty"`
|
|
}
|
|
|
|
func NewConfig() *Config {
|
|
return &Config{Mode: ModeAuto}
|
|
}
|
|
|
|
func ConfigFromConfigMap(configMap *v1.ConfigMap) (*Config, error) {
|
|
stringConfig, ok := configMap.Data[ConfigMapDataKey]
|
|
if !ok {
|
|
return nil, fmt.Errorf(`ConfigMap is missing expected key "%s"`, ConfigMapDataKey)
|
|
}
|
|
config := NewConfig()
|
|
if err := yaml.Unmarshal([]byte(stringConfig), config); err != nil {
|
|
return nil, fmt.Errorf("decode yaml: %w", err)
|
|
}
|
|
if config.Mode != ModeAuto && config.Mode != ModeEnabled && config.Mode != ModeDisabled {
|
|
return nil, fmt.Errorf(`illegal value for "mode": %s`, config.Mode)
|
|
}
|
|
return config, nil
|
|
}
|