//
// Copyright 2021 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

// Local copy of Envoy xDS proto file, used for testing only.

syntax = "proto3";

package envoy.config.rbac.v3;

import "src/proto/grpc/testing/xds/v3/address.proto";
import "src/proto/grpc/testing/xds/v3/extension.proto";
import "src/proto/grpc/testing/xds/v3/route.proto";
import "src/proto/grpc/testing/xds/v3/metadata.proto";
import "src/proto/grpc/testing/xds/v3/path.proto";
import "src/proto/grpc/testing/xds/v3/string.proto";
import "src/proto/grpc/testing/xds/v3/range.proto";

import "src/proto/grpc/testing/xds/v3/expr.proto";

// [#protodoc-title: Role Based Access Control (RBAC)]

// Role Based Access Control (RBAC) provides service-level and method-level access control for a
// service. Requests are allowed or denied based on the `action` and whether a matching policy is
// found. For instance, if the action is ALLOW and a matching policy is found the request should be
// allowed.
//
// RBAC can also be used to make access logging decisions by communicating with access loggers
// through dynamic metadata. When the action is LOG and at least one policy matches, the
// `access_log_hint` value in the shared key namespace 'envoy.common' is set to `true` indicating
// the request should be logged.
//
// Here is an example of RBAC configuration. It has two policies:
//
// * Service account "cluster.local/ns/default/sa/admin" has full access to the service, and so
//   does "cluster.local/ns/default/sa/superuser".
//
// * Any user can read ("GET") the service at paths with prefix "/products", so long as the
//   destination port is either 80 or 443.
//
//  .. code-block:: yaml
//
//   action: ALLOW
//   policies:
//     "service-admin":
//       permissions:
//         - any: true
//       principals:
//         - authenticated:
//             principal_name:
//               exact: "cluster.local/ns/default/sa/admin"
//         - authenticated:
//             principal_name:
//               exact: "cluster.local/ns/default/sa/superuser"
//     "product-viewer":
//       permissions:
//           - and_rules:
//               rules:
//                 - header:
//                     name: ":method"
//                     string_match:
//                       exact: "GET"
//                 - url_path:
//                     path: { prefix: "/products" }
//                 - or_rules:
//                     rules:
//                       - destination_port: 80
//                       - destination_port: 443
//       principals:
//         - any: true
//
message RBAC {
  // Should we do safe-list or block-list style access control?
  enum Action {
    // The policies grant access to principals. The rest are denied. This is safe-list style
    // access control. This is the default type.
    ALLOW = 0;

    // The policies deny access to principals. The rest are allowed. This is block-list style
    // access control.
    DENY = 1;

    // The policies set the `access_log_hint` dynamic metadata key based on if requests match.
    // All requests are allowed.
    LOG = 2;
  }

  message AuditLoggingOptions {
    // Deny and allow here refer to RBAC decisions, not actions.
    enum AuditCondition {
      // Never audit.
      NONE = 0;

      // Audit when RBAC denies the request.
      ON_DENY = 1;

      // Audit when RBAC allows the request.
      ON_ALLOW = 2;

      // Audit whether RBAC allows or denies the request.
      ON_DENY_AND_ALLOW = 3;
    }

    // [#not-implemented-hide:]
    message AuditLoggerConfig {
      // Typed logger configuration.
      //
      // [#extension-category: envoy.rbac.audit_loggers]
      core.v3.TypedExtensionConfig audit_logger = 1;

      // If true, when the logger is not supported, the data plane will not NACK but simply ignore it.
      bool is_optional = 2;
    }

    // Condition for the audit logging to happen.
    // If this condition is met, all the audit loggers configured here will be invoked.
    //
    // [#not-implemented-hide:]
    AuditCondition audit_condition = 1;

    // Configurations for RBAC-based authorization audit loggers.
    //
    // [#not-implemented-hide:]
    repeated AuditLoggerConfig logger_configs = 2;
  }

  // The action to take if a policy matches. Every action either allows or denies a request,
  // and can also carry out action-specific operations.
  //
  // Actions:
  //
  //  * ALLOW: Allows the request if and only if there is a policy that matches
  //    the request.
  //  * DENY: Allows the request if and only if there are no policies that
  //    match the request.
  //  * LOG: Allows all requests. If at least one policy matches, the dynamic
  //    metadata key `access_log_hint` is set to the value `true` under the shared
  //    key namespace 'envoy.common'. If no policies match, it is set to `false`.
  //    Other actions do not modify this key.
  //
  Action action = 1;

  // Maps from policy name to policy. A match occurs when at least one policy matches the request.
  // The policies are evaluated in lexicographic order of the policy name.
  map<string, Policy> policies = 2;

  // Audit logging options that include the condition for audit logging to happen
  // and audit logger configurations.
  //
  // [#not-implemented-hide:]
  AuditLoggingOptions audit_logging_options = 3;
}

// Policy specifies a role and the principals that are assigned/denied the role.
// A policy matches if and only if at least one of its permissions match the
// action taking place AND at least one of its principals match the downstream
// AND the condition is true if specified.
message Policy {
  // Required. The set of permissions that define a role. Each permission is
  // matched with OR semantics. To match all actions for this policy, a single
  // Permission with the `any` field set to true should be used.
  repeated Permission permissions = 1;

  // Required. The set of principals that are assigned/denied the role based on
  // “action”. Each principal is matched with OR semantics. To match all
  // downstreams for this policy, a single Principal with the `any` field set to
  // true should be used.
  repeated Principal principals = 2;

  // An optional symbolic expression specifying an access control
  // :ref:`condition <arch_overview_condition>`. The condition is combined
  // with the permissions and the principals as a clause with AND semantics.
  // Only be used when checked_condition is not used.
  google.api.expr.v1alpha1.Expr condition = 3;

  // [#not-implemented-hide:]
  // An optional symbolic expression that has been successfully type checked.
  // Only be used when condition is not used.
  google.api.expr.v1alpha1.CheckedExpr checked_condition = 4;
}

// Permission defines an action (or actions) that a principal can take.
// [#next-free-field: 13]
message Permission {
  // Used in the `and_rules` and `or_rules` fields in the `rule` oneof. Depending on the context,
  // each are applied with the associated behavior.
  message Set {
    repeated Permission rules = 1;
  }

  oneof rule {
    // A set of rules that all must match in order to define the action.
    Set and_rules = 1;

    // A set of rules where at least one must match in order to define the action.
    Set or_rules = 2;

    // When any is set, it matches any action.
    bool any = 3;

    // A header (or pseudo-header such as :path or :method) on the incoming HTTP request. Only
    // available for HTTP request.
    // Note: the pseudo-header :path includes the query and fragment string. Use the `url_path`
    // field if you want to match the URL path without the query and fragment string.
    route.v3.HeaderMatcher header = 4;

    // A URL path on the incoming HTTP request. Only available for HTTP.
    type.matcher.v3.PathMatcher url_path = 10;

    // A CIDR block that describes the destination IP.
    core.v3.CidrRange destination_ip = 5;

    // A port number that describes the destination port connecting to.
    uint32 destination_port = 6;

    // A port number range that describes a range of destination ports connecting to.
    type.v3.Int32Range destination_port_range = 11;

    // Metadata that describes additional information about the action.
    type.matcher.v3.MetadataMatcher metadata = 7;

    // Negates matching the provided permission. For instance, if the value of
    // `not_rule` would match, this permission would not match. Conversely, if
    // the value of `not_rule` would not match, this permission would match.
    Permission not_rule = 8;

    // The request server from the client's connection request. This is
    // typically TLS SNI.
    //
    // .. attention::
    //
    //   The behavior of this field may be affected by how Envoy is configured
    //   as explained below.
    //
    //   * If the :ref:`TLS Inspector <config_listener_filters_tls_inspector>`
    //     filter is not added, and if a `FilterChainMatch` is not defined for
    //     the :ref:`server name
    //     <envoy_v3_api_field_config.listener.v3.FilterChainMatch.server_names>`,
    //     a TLS connection's requested SNI server name will be treated as if it
    //     wasn't present.
    //
    //   * A :ref:`listener filter <arch_overview_listener_filters>` may
    //     overwrite a connection's requested server name within Envoy.
    //
    // Please refer to :ref:`this FAQ entry <faq_how_to_setup_sni>` to learn to
    // setup SNI.
    type.matcher.v3.StringMatcher requested_server_name = 9;

    // Extension for configuring custom matchers for RBAC.
    // [#extension-category: envoy.rbac.matchers]
    core.v3.TypedExtensionConfig matcher = 12;
  }
}

// Principal defines an identity or a group of identities for a downstream
// subject.
// [#next-free-field: 12]
message Principal {
  // Used in the `and_ids` and `or_ids` fields in the `identifier` oneof.
  // Depending on the context, each are applied with the associated behavior.
  message Set {
    repeated Principal ids = 1;
  }

  // Authentication attributes for a downstream.
  message Authenticated {
    reserved 1;

    // The name of the principal. If set, The URI SAN or DNS SAN in that order
    // is used from the certificate, otherwise the subject field is used. If
    // unset, it applies to any user that is authenticated.
    type.matcher.v3.StringMatcher principal_name = 2;
  }

  oneof identifier {
    // A set of identifiers that all must match in order to define the
    // downstream.
    Set and_ids = 1;

    // A set of identifiers at least one must match in order to define the
    // downstream.
    Set or_ids = 2;

    // When any is set, it matches any downstream.
    bool any = 3;

    // Authenticated attributes that identify the downstream.
    Authenticated authenticated = 4;

    // A CIDR block that describes the downstream IP.
    // This address will honor proxy protocol, but will not honor XFF.
    core.v3.CidrRange source_ip = 5;

    // A CIDR block that describes the downstream remote/origin address.
    // Note: This is always the physical peer even if the
    // :ref:`remote_ip <envoy_v3_api_field_config.rbac.v3.Principal.remote_ip>` is
    // inferred from for example the x-forwarder-for header, proxy protocol,
    // etc.
    core.v3.CidrRange direct_remote_ip = 10;

    // A CIDR block that describes the downstream remote/origin address.
    // Note: This may not be the physical peer and could be different from the
    // :ref:`direct_remote_ip
    // <envoy_v3_api_field_config.rbac.v3.Principal.direct_remote_ip>`. E.g, if the
    // remote ip is inferred from for example the x-forwarder-for header, proxy
    // protocol, etc.
    core.v3.CidrRange remote_ip = 11;

    // A header (or pseudo-header such as :path or :method) on the incoming HTTP
    // request. Only available for HTTP request. Note: the pseudo-header :path
    // includes the query and fragment string. Use the `url_path` field if you
    // want to match the URL path without the query and fragment string.
    route.v3.HeaderMatcher header = 6;

    // A URL path on the incoming HTTP request. Only available for HTTP.
    type.matcher.v3.PathMatcher url_path = 9;

    // Metadata that describes additional information about the principal.
    type.matcher.v3.MetadataMatcher metadata = 7;

    // Negates matching the provided principal. For instance, if the value of
    // `not_id` would match, this principal would not match. Conversely, if the
    // value of `not_id` would not match, this principal would match.
    Principal not_id = 8;
  }
}