api: support for external authz

api/v1alpha1/ext_auth_types.go

@@ -0,0 +1,97 @@
+// Copyright Envoy Gateway Authors
+// SPDX-License-Identifier: Apache-2.0
+// The full text of the Apache license is available in the LICENSE file at
+// the root of the repo.
+
+package v1alpha1
+
+import (
+	gwapiv1a2 "sigs.k8s.io/gateway-api/apis/v1alpha2"
+)
+
+// ExtAuthServiceType specifies the types of External Authorization.
+// +kubebuilder:validation:Enum=GRPC;HTTP
+type ExtAuthServiceType string
+
+const (
+	// GRPC external authorization service.
+	GRPC ExtAuthServiceType = "GRPC"
+
+	// HTTP external authorization service.
+	HTTP ExtAuthServiceType = "HTTP"
+)
+
+// ExtAuth defines the configuration for External Authorization.
+type ExtAuth struct {
+	// Type decides the type of External Authorization.
+	// Valid ExtAuthServiceType values are "GRPC" or "HTTP".
+	// +kubebuilder:validation:Enum=GRPC;HTTP
+	// +unionDiscriminator
+	Type ExtAuthServiceType `json:"type"`
+
+	// GRPC defines the gRPC External Authorization service
+	// Only one of GRPCService or HTTPService may be specified.
+	GRPC *GRPCExtAuthService `json:"grpcService,omitempty"`
+
+	// HTTP defines the HTTP External Authorization service
+	// Only one of GRPCService or HTTPService may be specified.
+	HTTP *HTTPExtAuthService `json:"httpService,omitempty"`
+
+	// AllowedHeaders defines the client request headers that will be included
+	// in the request to the external authorization service.
+	// Note: If not specified, the default behavior of different external authorization
+	// services is different. All headers will be included in the check request
+	// to a gRPC authorization server, whereas no headers will be included in the
+	// check request to an HTTP authorization server.
+	AllowedHeaders []string `json:"allowedHeaders,omitempty"`
+}
+
+// GRPCExtAuthService defines the gRPC External Authorization service
+type GRPCExtAuthService struct {
+	// Host is the hostname of the gRPC External Authorization service
+	Host gwapiv1a2.Hostname `json:"host"`
+
+	// Port is the network port of the gRPC External Authorization service
+	Port gwapiv1a2.PortNumber `json:"port"`
+
+	// TLS defines the TLS configuration for the gRPC External Authorization service.
+	// Note: If not specified, the proxy will talk to the gRPC External
+	// Authorization service in plaintext.
+	TLS *TLSConfig `json:"tlsSettings,omitempty"`
+}
+
+// HTTPExtAuthService defines the HTTP External Authorization service
+type HTTPExtAuthService struct {
+	// URL is the URL of the HTTP External Authorization service.
+	// The URL must be a fully qualified URL with a scheme, hostname,
+	// and optional port and path. Parameters are not allowed.
+	// The URL must use either the http or https scheme.
+	// If port is not specified, 80 for http and 443 for https are assumed.
+	// If path is specified, the authorization request will be sent to that path,
+	// or else the authorization request will be sent to the root path.
+	URL string `json:"url" yaml:"url"`
+
+	// TLS defines the TLS configuration for the HTTP External Authorization service.
+	// TLS is only valid when the URL scheme is https. If the URL scheme is
+	// https, and TLS is not specified, the proxy will use the system default
+	// certificate pool to verify the server certificate.
+	TLS *TLSConfig `json:"tlsSettings,omitempty"`
+
+	// Authorization response headers that will be added to the original client request
+	// before sending it to the upstream server.
+	// Note that coexistent headers will be overridden.
+	AllowedUpstreamHeaders []string `json:"allowedUpstreamHeaders,omitempty"`
+}
+
+// TLSConfig describes a TLS configuration.
+type TLSConfig struct {
+	// CertificateRefs contains a series of references to Kubernetes objects that
+	// contains TLS certificates and private keys. These certificates are used to
+	// establish a TLS handshake with the external authorization server.
+	//
+	// If this field is not specified, the proxy will not present a client certificate
+	// and will use the system default certificate pool to verify the server certificate.
+	// +optional
+	// +kubebuilder:validation:MaxItems=64
+	CertificateRefs []gwapiv1a2.SecretObjectReference `json:"certificateRefs,omitempty"`
+}

api/v1alpha1/securitypolicy_types.go

@@ -66,6 +66,11 @@ type SecurityPolicySpec struct {
 	//
 	// +optional
 	OIDC *OIDC `json:"oidc,omitempty"`
+
+	// ExtAuth defines the configuration for External Authorization.
+	//
+	// +optional
+	ExtAuth *ExtAuth `json:"extAuth,omitempty"`
 }
 
 // SecurityPolicyStatus defines the state of SecurityPolicy