// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1

syntax = "proto3";

package hashicorp.consul.mesh.v1alpha1.pbproxystate;

message TLS {
  // inbound_tls_parameters has default TLS parameter configuration for inbound connections. These can be overridden per
  // transport socket.
  TLSParameters inbound_tls_parameters = 1;
  // outbound_tls_parameters has default TLS parameter configuration for inbound connections. These can be overridden per transport socket.
  TLSParameters outbound_tls_parameters = 2;
}

message TransportSocket {
  // name of the transport socket
  string name = 1;
  oneof connection_tls {
    // inbound_mesh is for incoming connections FROM the mesh.
    InboundMeshMTLS inbound_mesh = 2;
    // outbound_mesh is for outbound connections TO mesh destinations.
    OutboundMeshMTLS outbound_mesh = 3;
    // inbound_non_mesh is for incoming connections FROM non mesh.
    InboundNonMeshTLS inbound_non_mesh = 4;
    // outbound_non_mesh is for outbound connections TO non mesh destinations.
    OutboundNonMeshTLS outbound_non_mesh = 5;
  }
  // tls_parameters can override any top level tls parameters that are configured.
  TLSParameters tls_parameters = 6;
  repeated string alpn_protocols = 7;
}

message InboundMeshMTLS {
  // identity_key is UUID key to use to look up the leaf certificate in ProxyState to present for incoming connections.
  string identity_key = 1;
  // validation_context has what is needed to validate incoming connections.
  MeshInboundValidationContext validation_context = 2;
}

message OutboundMeshMTLS {
  // identity_key is UUID key to use to look up the leaf certificate in ProxyState when connecting to destinations.
  string identity_key = 1;
  // validation_context has what is needed to validate the destination.
  MeshOutboundValidationContext validation_context = 2;
  // sni to use when connecting to the destination.
  string sni = 3;
}

message InboundNonMeshTLS {
  // identity is the reference to the leaf certificate to present for incoming connections.
  oneof identity {
    // leaf_key is the UUID key to use to look up the leaf certificate in the ProxyState leaf certificate map.
    string leaf_key = 1;
    // sds refers to certificates retrieved via Envoy SDS.
    SDSCertificate sds = 2;
  }
}

message OutboundNonMeshTLS {
  // cert_file is a filename for a certificate to present for outbound connections.
  string cert_file = 1;
  // key_file is a filename for a key for outbound connections.
  string key_file = 2;
  // validation_context has what is needed to validate the destination.
  NonMeshOutboundValidationContext validation_context = 3;
}

message MeshInboundValidationContext {
  // trust_bundle_peer_name_keys is which trust bundles to use for validating incoming connections. If this workload is exported
  // to peers, the incoming connection could be from a different peer, requiring that trust bundle to validate the
  // connection. These could be local or peered trust bundles. This will be a key in the trust bundle map.
  repeated string trust_bundle_peer_name_keys = 1;
}

message MeshOutboundValidationContext {
  // trust_bundle_peer_name_key is which trust bundle to use for the destination. It could be the local or a peer's trust bundle.
  // This will be a key in the trust bundle map.
  string trust_bundle_peer_name_key = 1;
  // spiffe_ids is one or more spiffe IDs to validate.
  repeated string spiffe_ids = 2;
}

message NonMeshOutboundValidationContext {
  // ca_file is a filename for a ca for outbound connections to validate the destination.
  string ca_file = 1;
}

message SDSCertificate {
  string cluster_name = 1;
  string cert_resource = 2;
}

message TLSParameters {
  TLSVersion min_version = 1;
  TLSVersion max_version = 2;
  repeated TLSCipherSuite cipher_suites = 3;
}

message LeafCertificate {
  string cert = 1;
  string key = 2;
}

message TrustBundle {
  string trust_domain = 1;
  repeated string roots = 2;
}

enum TLSVersion {
  // buf:lint:ignore ENUM_ZERO_VALUE_SUFFIX
  TLS_VERSION_AUTO = 0;
  TLS_VERSION_1_0 = 1;
  TLS_VERSION_1_1 = 2;
  TLS_VERSION_1_2 = 3;
  TLS_VERSION_1_3 = 4;
  TLS_VERSION_INVALID = 5;
  TLS_VERSION_UNSPECIFIED = 6;
}

enum TLSCipherSuite {
  // buf:lint:ignore ENUM_ZERO_VALUE_SUFFIX
  TLS_CIPHER_SUITE_ECDHE_ECDSA_AES128_GCM_SHA256 = 0;
  TLS_CIPHER_SUITE_ECDHE_ECDSA_CHACHA20_POLY1305 = 1;
  TLS_CIPHER_SUITE_ECDHE_RSA_AES128_GCM_SHA256 = 2;
  TLS_CIPHER_SUITE_ECDHE_RSA_CHACHA20_POLY1305 = 3;
  TLS_CIPHER_SUITE_ECDHE_ECDSA_AES128_SHA = 4;
  TLS_CIPHER_SUITE_ECDHE_RSA_AES128_SHA = 5;
  TLS_CIPHER_SUITE_AES128_GCM_SHA256 = 6;
  TLS_CIPHER_SUITE_AES128_SHA = 7;
  TLS_CIPHER_SUITE_ECDHE_ECDSA_AES256_GCM_SHA384 = 8;
  TLS_CIPHER_SUITE_ECDHE_RSA_AES256_GCM_SHA384 = 9;
  TLS_CIPHER_SUITE_ECDHE_ECDSA_AES256_SHA = 10;
  TLS_CIPHER_SUITE_ECDHE_RSA_AES256_SHA = 11;
  TLS_CIPHER_SUITE_AES256_GCM_SHA384 = 12;
  TLS_CIPHER_SUITE_AES256_SHA = 13;
}