syntax = "proto3";

package envoy.extensions.filters.http.ext_authz.v3;

import "envoy/config/common/mutation_rules/v3/mutation_rules.proto";
import "envoy/config/core/v3/base.proto";
import "envoy/config/core/v3/config_source.proto";
import "envoy/config/core/v3/grpc_service.proto";
import "envoy/config/core/v3/http_uri.proto";
import "envoy/type/matcher/v3/metadata.proto";
import "envoy/type/matcher/v3/string.proto";
import "envoy/type/v3/http_status.proto";

import "google/protobuf/struct.proto";
import "google/protobuf/wrappers.proto";

import "envoy/annotations/deprecation.proto";
import "udpa/annotations/sensitive.proto";
import "udpa/annotations/status.proto";
import "udpa/annotations/versioning.proto";
import "validate/validate.proto";

option java_package = "io.envoyproxy.envoy.extensions.filters.http.ext_authz.v3";
option java_outer_classname = "ExtAuthzProto";
option java_multiple_files = true;
option go_package = "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/ext_authz/v3;ext_authzv3";
option (udpa.annotations.file_status).package_version_status = ACTIVE;

// [#protodoc-title: External Authorization]
// External Authorization :ref:`configuration overview <config_http_filters_ext_authz>`.
// [#extension: envoy.filters.http.ext_authz]

// [#next-free-field: 33]
message ExtAuthz {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.config.filter.http.ext_authz.v3.ExtAuthz";

  reserved 4;

  reserved "use_alpha";

  // External authorization service configuration.
  oneof services {
    // gRPC service configuration (default timeout: 200ms).
    config.core.v3.GrpcService grpc_service = 1;

    // HTTP service configuration (default timeout: 200ms).
    HttpService http_service = 3;
  }

  // API version for ext_authz transport protocol. This describes the ext_authz gRPC endpoint and
  // version of messages used on the wire.
  config.core.v3.ApiVersion transport_api_version = 12
      [(validate.rules).enum = {defined_only: true}];

  // Changes the filter's behavior on errors:
  //
  // * When set to ``true``, the filter will ``accept`` the client request even if communication with
  //   the authorization service has failed, or if the authorization service has returned an HTTP 5xx
  //   error.
  //
  // * When set to ``false``, the filter will ``reject`` client requests and return ``Forbidden``
  //   if communication with the authorization service has failed, or if the authorization service
  //   has returned an HTTP 5xx error.
  //
  // Errors can always be tracked in the :ref:`stats <config_http_filters_ext_authz_stats>`.
  //
  // Defaults to ``false``.
  bool failure_mode_allow = 2;

  // When ``failure_mode_allow`` and ``failure_mode_allow_header_add`` are both set to ``true``,
  // ``x-envoy-auth-failure-mode-allowed: true`` will be added to request headers if the communication
  // with the authorization service has failed, or if the authorization service has returned a
  // HTTP 5xx error.
  bool failure_mode_allow_header_add = 19;

  // Enables the filter to buffer the client request body and send it within the authorization request.
  // The ``x-envoy-auth-partial-body: false|true`` metadata header will be added to the authorization
  // request indicating whether the body data is partial.
  BufferSettings with_request_body = 5;

  // Clears the route cache in order to allow the external authorization service to correctly affect
  // routing decisions. The filter clears all cached routes when all of the following holds:
  //
  // * This field is set to ``true``.
  // * The status returned from the authorization service is an HTTP 200 or gRPC 0.
  // * At least one ``authorization response header`` is added to the client request, or is used to
  //   alter another client request header.
  //
  // Defaults to ``false``.
  bool clear_route_cache = 6;

  // Sets the HTTP status that is returned to the client when the authorization server returns an error
  // or cannot be reached.
  //
  // The default status is ``HTTP 403 Forbidden``.
  type.v3.HttpStatus status_on_error = 7;

  // When set to ``true``, the filter will check the :ref:`ext_authz response
  // <envoy_v3_api_msg_service.auth.v3.CheckResponse>` for invalid header and
  // query parameter mutations. If the response is invalid, the filter will send a local reply
  // to the downstream request with status ``HTTP 500 Internal Server Error``.
  //
  // .. note::
  //   Both ``headers_to_remove`` and ``query_parameters_to_remove`` are validated, but invalid elements in
  //   those fields should not affect any headers and thus will not cause the filter to send a local reply.
  //
  // When set to ``false``, any invalid mutations will be visible to the rest of Envoy and may cause
  // unexpected behavior.
  //
  // If you are using ext_authz with an untrusted ext_authz server, you should set this to ``true``.
  //
  // Defaults to ``false``.
  bool validate_mutations = 24;

  // Specifies a list of metadata namespaces whose values, if present, will be passed to the
  // ext_authz service. The :ref:`filter_metadata <envoy_v3_api_field_config.core.v3.Metadata.filter_metadata>`
  // is passed as an opaque ``protobuf::Struct``.
  //
  // .. note::
  //   This field applies exclusively to the gRPC ext_authz service and has no effect on the HTTP service.
  //
  // For example, if the ``jwt_authn`` filter is used and :ref:`payload_in_metadata
  // <envoy_v3_api_field_extensions.filters.http.jwt_authn.v3.JwtProvider.payload_in_metadata>` is set,
  // then the following will pass the jwt payload to the authorization server.
  //
  // .. code-block:: yaml
  //
  //    metadata_context_namespaces:
  //    - envoy.filters.http.jwt_authn
  //
  repeated string metadata_context_namespaces = 8;

  // Specifies a list of metadata namespaces whose values, if present, will be passed to the
  // ext_authz service. :ref:`typed_filter_metadata <envoy_v3_api_field_config.core.v3.Metadata.typed_filter_metadata>`
  // is passed as a ``protobuf::Any``.
  //
  // .. note::
  //   This field applies exclusively to the gRPC ext_authz service and has no effect on the HTTP service.
  //
  // This works similarly to ``metadata_context_namespaces`` but allows Envoy and the ext_authz server to share
  // the protobuf message definition in order to perform safe parsing.
  //
  repeated string typed_metadata_context_namespaces = 16;

  // Specifies a list of route metadata namespaces whose values, if present, will be passed to the
  // ext_authz service at :ref:`route_metadata_context <envoy_v3_api_field_service.auth.v3.AttributeContext.route_metadata_context>` in
  // :ref:`CheckRequest <envoy_v3_api_field_service.auth.v3.CheckRequest.attributes>`.
  // :ref:`filter_metadata <envoy_v3_api_field_config.core.v3.Metadata.filter_metadata>` is passed as an opaque ``protobuf::Struct``.
  repeated string route_metadata_context_namespaces = 21;

  // Specifies a list of route metadata namespaces whose values, if present, will be passed to the
  // ext_authz service at :ref:`route_metadata_context <envoy_v3_api_field_service.auth.v3.AttributeContext.route_metadata_context>` in
  // :ref:`CheckRequest <envoy_v3_api_field_service.auth.v3.CheckRequest.attributes>`.
  // :ref:`typed_filter_metadata <envoy_v3_api_field_config.core.v3.Metadata.typed_filter_metadata>` is passed as a ``protobuf::Any``.
  repeated string route_typed_metadata_context_namespaces = 22;

  // Specifies if the filter is enabled.
  //
  // If :ref:`runtime_key <envoy_v3_api_field_config.core.v3.RuntimeFractionalPercent.runtime_key>` is specified,
  // Envoy will lookup the runtime key to get the percentage of requests to filter.
  //
  // If this field is not specified, the filter will be enabled for all requests.
  config.core.v3.RuntimeFractionalPercent filter_enabled = 9;

  // Specifies if the filter is enabled with metadata matcher.
  // If this field is not specified, the filter will be enabled for all requests.
  //
  // .. note::
  //
  //   This field is only evaluated if the filter is instantiated. If the filter is marked with
  //   ``disabled: true`` in the :ref:`HttpFilter
  //   <envoy_v3_api_msg_extensions.filters.network.http_connection_manager.v3.HttpFilter>`
  //   configuration or in per-route configuration via :ref:`ExtAuthzPerRoute
  //   <envoy_v3_api_msg_extensions.filters.http.ext_authz.v3.ExtAuthzPerRoute>`,
  //   the filter will not be instantiated and this field will have no effect.
  //
  // .. tip::
  //
  //   For dynamic filter activation based on metadata (such as metadata set by a preceding
  //   filter), consider using :ref:`ExtensionWithMatcher
  //   <envoy_v3_api_msg_extensions.common.matching.v3.ExtensionWithMatcher>` instead. This
  //   provides a more flexible matching framework that can evaluate conditions before filter
  //   instantiation. See the :ref:`ext_authz filter documentation
  //   <config_http_filters_ext_authz>` for examples.
  type.matcher.v3.MetadataMatcher filter_enabled_metadata = 14;

  // Specifies whether to deny the requests when the filter is disabled.
  // If :ref:`runtime_key <envoy_v3_api_field_config.core.v3.RuntimeFeatureFlag.runtime_key>` is specified,
  // Envoy will lookup the runtime key to determine whether to deny requests for filter-protected paths
  // when the filter is disabled. If the filter is disabled in ``typed_per_filter_config`` for the path,
  // requests will not be denied.
  //
  // If this field is not specified, all requests will be allowed when disabled.
  //
  // If a request is denied due to this setting, the response code in :ref:`status_on_error
  // <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.status_on_error>` will
  // be returned.
  config.core.v3.RuntimeFeatureFlag deny_at_disable = 11;

  // Specifies if the peer certificate is sent to the external service.
  //
  // When this field is ``true``, Envoy will include the peer X.509 certificate, if available, in the
  // :ref:`certificate<envoy_v3_api_field_service.auth.v3.AttributeContext.Peer.certificate>`.
  bool include_peer_certificate = 10;

  // Optional additional prefix to use when emitting statistics. This allows distinguishing
  // emitted statistics between configured ``ext_authz`` filters in an HTTP filter chain. For example:
  //
  // .. code-block:: yaml
  //
  //   http_filters:
  //     - name: envoy.filters.http.ext_authz
  //       typed_config:
  //         "@type": type.googleapis.com/envoy.extensions.filters.http.ext_authz.v3.ExtAuthz
  //         stat_prefix: waf # This emits ext_authz.waf.ok, ext_authz.waf.denied, etc.
  //     - name: envoy.filters.http.ext_authz
  //       typed_config:
  //         "@type": type.googleapis.com/envoy.extensions.filters.http.ext_authz.v3.ExtAuthz
  //         stat_prefix: blocker # This emits ext_authz.blocker.ok, ext_authz.blocker.denied, etc.
  //
  string stat_prefix = 13;

  // Optional labels that will be passed to :ref:`labels<envoy_v3_api_field_service.auth.v3.AttributeContext.Peer.labels>` in
  // :ref:`destination<envoy_v3_api_field_service.auth.v3.AttributeContext.destination>`.
  // The labels will be read from :ref:`metadata<envoy_v3_api_msg_config.core.v3.Node>` with the specified key.
  string bootstrap_metadata_labels_key = 15;

  // Check request to authorization server will include the client request headers that have a correspondent match
  // in the list. If this option isn't specified, then
  // all client request headers are included in the check request to a gRPC authorization server, whereas no client request headers
  // (besides the ones allowed by default - see note below) are included in the check request to an HTTP authorization server.
  // This inconsistency between gRPC and HTTP servers is to maintain backwards compatibility with legacy behavior.
  //
  // .. note::
  //
  //  For requests to an HTTP authorization server: in addition to the user's supplied matchers, ``Host``, ``Method``, ``Path``,
  //  ``Content-Length``, and ``Authorization`` are **additionally included** in the list.
  //
  // .. note::
  //
  //  For requests to an HTTP authorization server: the value of ``Content-Length`` will be set to ``0`` and the request to the
  //  authorization server will not have a message body. However, the check request can include the buffered
  //  client request body (controlled by :ref:`with_request_body
  //  <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.with_request_body>` setting);
  //  consequently, the value of ``Content-Length`` in the authorization request reflects the size of its payload.
  //
  // .. note::
  //
  //  This can be overridden by the field ``disallowed_headers`` below. That is, if a header
  //  matches for both ``allowed_headers`` and ``disallowed_headers``, the header will NOT be sent.
  type.matcher.v3.ListStringMatcher allowed_headers = 17;

  // If set, specifically disallow any header in this list to be forwarded to the external
  // authentication server. This overrides the above ``allowed_headers`` if a header matches both.
  type.matcher.v3.ListStringMatcher disallowed_headers = 25;

  // Specifies if the TLS session level details like SNI are sent to the external service.
  //
  // When this field is ``true``, Envoy will include the SNI name used for TLSClientHello, if available, in the
  // :ref:`tls_session<envoy_v3_api_field_service.auth.v3.AttributeContext.tls_session>`.
  bool include_tls_session = 18;

  // Whether to increment cluster statistics (e.g. cluster.<cluster_name>.upstream_rq_*) on authorization failure.
  // Defaults to ``true``.
  google.protobuf.BoolValue charge_cluster_response_stats = 20;

  // Whether to encode the raw headers (i.e., unsanitized values and unconcatenated multi-line headers)
  // in the authorization request. Works with both HTTP and gRPC clients.
  //
  // When this is set to ``true``, header values are not sanitized. Headers with the same key will also
  // not be combined into a single, comma-separated header.
  // Requests to gRPC services will populate the field
  // :ref:`header_map<envoy_v3_api_field_service.auth.v3.AttributeContext.HttpRequest.header_map>`.
  // Requests to HTTP services will be constructed with the unsanitized header values and preserved
  // multi-line headers with the same key.
  //
  // If this field is set to ``false``, header values will be sanitized, with any non-UTF-8-compliant
  // bytes replaced with ``'!'``. Headers with the same key will have their values concatenated into a
  // single comma-separated header value.
  // Requests to gRPC services will populate the field
  // :ref:`headers<envoy_v3_api_field_service.auth.v3.AttributeContext.HttpRequest.headers>`.
  // Requests to HTTP services will have their header values sanitized and will not preserve
  // multi-line headers with the same key.
  //
  // It is recommended to set this to ``true`` unless you rely on the previous behavior.
  //
  // It is set to ``false`` by default for backwards compatibility.
  bool encode_raw_headers = 23;

  // Rules for what modifications an ext_authz server may make to the request headers before
  // continuing decoding or forwarding upstream.
  //
  // If set, enables header mutation checking against the configured rules. Note that
  // :ref:`HeaderMutationRules <envoy_v3_api_msg_config.common.mutation_rules.v3.HeaderMutationRules>`
  // has defaults that change ext_authz behavior. Also note that if this field is set,
  // ext_authz can no longer append to ``:``-prefixed headers.
  //
  // If unset, header mutation rule checking is completely disabled.
  //
  // Regardless of what is configured here, ext_authz cannot remove ``:``-prefixed headers.
  //
  // This field and ``validate_mutations`` have different use cases. ``validate_mutations`` enables
  // correctness checks for all header and query parameter mutations (for example, invalid characters).
  // This field allows the filter to reject mutations to specific headers.
  config.common.mutation_rules.v3.HeaderMutationRules decoder_header_mutation_rules = 26;

  // Enable or disable ingestion of dynamic metadata from the ext_authz service.
  //
  // If ``false``, the filter will ignore dynamic metadata injected by the ext_authz service. If the
  // ext_authz service tries injecting dynamic metadata, the filter will log, increment the
  // ``ignored_dynamic_metadata`` stat, then continue handling the response.
  //
  // If ``true``, the filter will ingest dynamic metadata entries as normal.
  //
  // If unset, defaults to ``true``.
  google.protobuf.BoolValue enable_dynamic_metadata_ingestion = 27;

  // Additional metadata to be added to the filter state for logging purposes. The metadata will be
  // added to StreamInfo's filter state under the namespace corresponding to the ext_authz filter
  // name.
  google.protobuf.Struct filter_metadata = 28;

  // When set to ``true``, the filter will emit per-stream stats for access logging. The filter state
  // key will be the same as the filter name.
  //
  // If using Envoy gRPC, emits latency, bytes sent / received, upstream info, and upstream cluster
  // info. If not using Envoy gRPC, emits only latency.
  //
  // .. note::
  //   Stats are ONLY added to filter state if a check request is actually made to an ext_authz service.
  //
  // If this is ``false`` the filter will not emit stats, but filter_metadata will still be respected if
  // it has a value.
  //
  // Field ``latency_us`` is exposed for CEL and logging when using gRPC or HTTP service.
  // Fields ``bytesSent`` and ``bytesReceived`` are exposed for CEL and logging only when using gRPC service.
  bool emit_filter_state_stats = 29;

  // Sets the maximum size (in bytes) of the response body that the filter will send downstream
  // when a request is denied by the external authorization service.
  //
  // If the authorization server returns a response body larger than this configured limit,
  // the body will be truncated to ``max_denied_response_body_bytes`` before being sent to the
  // downstream client.
  //
  // If this field is not set or is set to 0, no truncation will occur, and the entire
  // denied response body will be forwarded.
  uint32 max_denied_response_body_bytes = 30;

  // When set to ``true``, the filter will enforce the response header map's count and size limits
  // by sending a local reply when those limits are violated.
  //
  // When set to ``false``, the filter will ignore the response header map's limits and add / set
  // all response headers as specified by the external authorization service.
  //
  // Recommendation: enable if the external authorization service is not trusted. Otherwise, leave
  // it ``false``.
  //
  // Defaults to ``false``.
  bool enforce_response_header_limits = 31;

  // When set to ``true``, the filter operates in shadow mode. In shadow mode the
  // filter still calls the external authorization service and processes the response,
  // but never terminates the request. Instead of sending a local reply on a denied or
  // error response, the filter writes the authorization decision (engine result, status
  // code, response headers) into the request's
  // :ref:`FilterState <arch_overview_data_sharing_between_filters>` as a
  // :ref:`ShadowDecision
  // <envoy_v3_api_msg_extensions.filters.http.ext_authz.v3.ShadowDecision>` object so
  // that subsequent filters can read and optionally enforce it.
  //
  // The FilterState key is the filter's configured ``name`` in the filter chain with a
  // ``.shadow`` suffix (``envoy.filters.http.ext_authz.shadow`` by default). Multiple ext_authz
  // filters in the same chain must already have distinct names and therefore write to distinct
  // keys automatically.
  //
  // The auth server's denied-response body is intentionally **not** carried on the
  // ShadowDecision: bodies can be arbitrarily large and no downstream consumer in the
  // shadow-comparison flow needs them. A consumer that wants to reproduce the auth
  // server's full denied response must read it from its own source of truth rather
  // than replaying it from FilterState.
  //
  // Header and query-parameter mutations from an OK response are still applied to the
  // request as usual.
  //
  // Defaults to ``false``.
  bool shadow_mode = 32;
}

// Serialized form of the shadow-mode authorization decision written to FilterState
// when :ref:`shadow_mode
// <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.shadow_mode>` is
// enabled. Consumed by a downstream filter that decides whether to enforce the
// decision.
message ShadowDecision {
  // The decision the auth server returned.
  enum CheckResult {
    UNSPECIFIED = 0;
    OK = 1;
    DENIED = 2;
    ERROR = 3;
  }

  // The decision the auth server returned.
  CheckResult check_result = 1;

  // Response status code associated with the decision. For ``DENIED`` and ``ERROR`` this is
  // the code the filter would have set on termination (the auth server's code for ``DENIED``,
  // or :ref:`status_on_error
  // <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.status_on_error>` fallback
  // for ``ERROR``). For ``OK`` this defaults to ``200`` so consumers always see a populated
  // value — the upstream response code is not known at shadow-decision time.
  uint32 status_code = 2 [(validate.rules).uint32 = {lte: 599 gte: 100 ignore_empty: true}];

  // Response headers the auth server asked to set on a denied response
  // (e.g. ``WWW-Authenticate``, ``Set-Cookie``). Populated for ``DENIED`` only.
  // Preserves ordering and duplicate header names.
  repeated config.core.v3.HeaderValue response_headers = 3;
}

// Configuration for buffering the request data.
message BufferSettings {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.config.filter.http.ext_authz.v2.BufferSettings";

  // Sets the maximum size of a message body that the filter will hold in memory. Envoy will return
  // ``HTTP 413`` and will *not* initiate the authorization process when the buffer reaches the size
  // set in this field.
  //
  // .. note::
  //   This setting will have precedence over :ref:`failure_mode_allow
  //   <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.failure_mode_allow>`.
  uint32 max_request_bytes = 1 [(validate.rules).uint32 = {gt: 0}];

  // When this field is ``true``, Envoy will buffer the message until ``max_request_bytes`` is reached.
  // The authorization request will be dispatched and no 413 HTTP error will be returned by the
  // filter.
  //
  // Defaults to ``false``.
  bool allow_partial_message = 2;

  // If ``true``, the body sent to the external authorization service is set as raw bytes and populates
  // :ref:`raw_body<envoy_v3_api_field_service.auth.v3.AttributeContext.HttpRequest.raw_body>`
  // in the HTTP request attribute context. Otherwise, :ref:`body
  // <envoy_v3_api_field_service.auth.v3.AttributeContext.HttpRequest.body>` will be populated
  // with a UTF-8 string request body.
  //
  // This field only affects configurations using a :ref:`grpc_service
  // <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.grpc_service>`. In configurations that use
  // an :ref:`http_service <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.http_service>`, this
  // has no effect.
  //
  // Defaults to ``false``.
  bool pack_as_bytes = 3;
}

// HttpService is used for raw HTTP communication between the filter and the authorization service.
// When configured, the filter will parse the client request and use these attributes to call the
// authorization server. Depending on the response, the filter may reject or accept the client
// request.
//
// .. note::
//   In any of these events, metadata can be added, removed or overridden by the filter:
//
// On authorization request, a list of allowed request headers may be supplied. See
// :ref:`allowed_headers
// <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.AuthorizationRequest.allowed_headers>`
// for details. Additional headers metadata may be added to the authorization request. See
// :ref:`headers_to_add
// <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.AuthorizationRequest.headers_to_add>` for
// details.
//
// On authorization response status ``HTTP 200 OK``, the filter will allow traffic to the upstream and
// additional headers metadata may be added to the original client request. See
// :ref:`allowed_upstream_headers
// <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.AuthorizationResponse.allowed_upstream_headers>`
// for details. Additionally, the filter may add additional headers to the client's response. See
// :ref:`allowed_client_headers_on_success
// <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.AuthorizationResponse.allowed_client_headers_on_success>`
// for details.
//
// On other authorization response statuses, the filter will not allow traffic. Additional headers
// metadata as well as body may be added to the client's response. See :ref:`allowed_client_headers
// <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.AuthorizationResponse.allowed_client_headers>`
// for details.
// [#next-free-field: 11]
message HttpService {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.config.filter.http.ext_authz.v2.HttpService";

  reserved 3, 4, 5, 6;

  // Sets the HTTP server URI which the authorization requests must be sent to.
  config.core.v3.HttpUri server_uri = 1;

  // Sets a prefix to the value of authorization request header ``Path``.
  // Only one of ``path_prefix`` or ``path_override`` may be set.
  string path_prefix = 2;

  // Replaces the value of authorization request header ``Path`` with this value.
  // Only one of ``path_prefix`` or ``path_override`` may be set.
  string path_override = 10;

  // Settings used for controlling authorization request metadata.
  AuthorizationRequest authorization_request = 7;

  // Settings used for controlling authorization response metadata.
  AuthorizationResponse authorization_response = 8;

  // Optional retry policy for requests to the authorization server.
  // If not set, no retries will be performed.
  //
  // .. note::
  //   When this field is set, the ``ext_authz`` filter will buffer the request body for retry purposes.
  config.core.v3.RetryPolicy retry_policy = 9;
}

message AuthorizationRequest {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.config.filter.http.ext_authz.v2.AuthorizationRequest";

  // Authorization request includes the client request headers that have a corresponding match
  // in the list.
  // This field has been deprecated in favor of :ref:`allowed_headers
  // <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.allowed_headers>`.
  //
  // .. note::
  //
  //   In addition to the user's supplied matchers, ``Host``, ``Method``, ``Path``,
  //   ``Content-Length``, and ``Authorization`` are **automatically included** in the list.
  //
  // .. note::
  //
  //   By default, the ``Content-Length`` header is set to ``0`` and the request to the authorization
  //   service has no message body. However, the authorization request *may* include the buffered
  //   client request body (controlled by :ref:`with_request_body
  //   <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.with_request_body>`
  //   setting); hence the value of its ``Content-Length`` reflects the size of its payload.
  //
  type.matcher.v3.ListStringMatcher allowed_headers = 1
      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];

  // Sets a list of headers that will be included in the request to the authorization service.
  //
  // .. note::
  //   Client request headers with the same key will be overridden.
  repeated config.core.v3.HeaderValue headers_to_add = 2;
}

// [#next-free-field: 6]
message AuthorizationResponse {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.config.filter.http.ext_authz.v2.AuthorizationResponse";

  // When this list is set, authorization
  // response headers that have a correspondent match will be added to the original client request.
  //
  // .. note::
  //   Existing headers will be overridden.
  type.matcher.v3.ListStringMatcher allowed_upstream_headers = 1;

  // When this list is set, authorization
  // response headers that have a correspondent match will be added to the original client request.
  //
  // .. note::
  //   Existing headers will be appended.
  type.matcher.v3.ListStringMatcher allowed_upstream_headers_to_append = 3;

  // When this list is set, authorization
  // response headers that have a correspondent match will be added to the client's response.
  // When a header is included in this list, ``Path``, ``Status``, ``Content-Length``, ``WWW-Authenticate`` and
  // ``Location`` are automatically added.
  //
  // .. note::
  //   When this list is *not* set, all the authorization response headers, except
  //   ``Authority (Host)``, will be in the response to the client.
  type.matcher.v3.ListStringMatcher allowed_client_headers = 2;

  // When this list is set, authorization
  // response headers that have a correspondent match will be added to the client's response when
  // the authorization response itself is successful, i.e. not failed or denied. When this list is
  // *not* set, no additional headers will be added to the client's response on success.
  type.matcher.v3.ListStringMatcher allowed_client_headers_on_success = 4;

  // When this list is set, authorization
  // response headers that have a correspondent match will be emitted as dynamic metadata to be consumed
  // by the next filter. This metadata lives in a namespace specified by the canonical name of extension filter
  // that requires it:
  //
  // - :ref:`envoy.filters.http.ext_authz <config_http_filters_ext_authz_dynamic_metadata>` for HTTP filter.
  // - :ref:`envoy.filters.network.ext_authz <config_network_filters_ext_authz_dynamic_metadata>` for network filter.
  type.matcher.v3.ListStringMatcher dynamic_metadata_from_headers = 5;
}

// Extra settings on a per virtualhost/route/weighted-cluster level.
message ExtAuthzPerRoute {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.config.filter.http.ext_authz.v2.ExtAuthzPerRoute";

  oneof override {
    option (validate.required) = true;

    // Disable the ext auth filter for this particular vhost or route.
    // If disabled is specified in multiple per-filter-configs, the most specific one will be used.
    // If the filter is disabled by default and this is set to ``false``, the filter will be enabled
    // for this vhost or route.
    bool disabled = 1;

    // Check request settings for this route.
    CheckSettings check_settings = 2 [(validate.rules).message = {required: true}];
  }
}

// Extra settings for the check request.
// [#next-free-field: 6]
message CheckSettings {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.config.filter.http.ext_authz.v2.CheckSettings";

  // Context extensions to set on the CheckRequest's
  // :ref:`AttributeContext.context_extensions<envoy_v3_api_field_service.auth.v3.AttributeContext.context_extensions>`
  //
  // You can use this to provide extra context for the external authorization server on specific
  // virtual hosts/routes. For example, adding a context extension on the virtual host level can
  // give the ext-authz server information on what virtual host is used without needing to parse the
  // host header. If CheckSettings is specified in multiple per-filter-configs, they will be merged
  // in order, and the result will be used.
  //
  // Merge semantics for this field are such that keys from more specific configs override.
  //
  // .. note::
  //   These settings are only applied to a filter configured with a
  //   :ref:`grpc_service<envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.grpc_service>`.
  map<string, string> context_extensions = 1 [(udpa.annotations.sensitive) = true];

  // When set to ``true``, disable the configured :ref:`with_request_body
  // <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.with_request_body>` for a specific route.
  //
  // Only one of ``disable_request_body_buffering`` and
  // :ref:`with_request_body <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.CheckSettings.with_request_body>`
  // may be specified.
  bool disable_request_body_buffering = 2;

  // Enable or override request body buffering, which is configured using the
  // :ref:`with_request_body <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.ExtAuthz.with_request_body>`
  // option for a specific route.
  //
  // Only one of ``with_request_body`` and
  // :ref:`disable_request_body_buffering <envoy_v3_api_field_extensions.filters.http.ext_authz.v3.CheckSettings.disable_request_body_buffering>`
  // may be specified.
  BufferSettings with_request_body = 3;

  // Override the external authorization service for this route.
  // This allows different routes to use different external authorization service backends
  // and service types (gRPC or HTTP). If specified, this overrides the filter-level service
  // configuration regardless of the original service type.
  oneof service_override {
    // Override with a gRPC service configuration.
    config.core.v3.GrpcService grpc_service = 4;

    // Override with an HTTP service configuration.
    HttpService http_service = 5;
  }
}
