Documentation

Overview

Package alts implements the ALTS credential support by gRPC library, which encapsulates all the state needed by a client to authenticate with a server using ALTS and make various assertions, e.g., about the client's identity, role, or whether it is authorized to make a particular call. This package is experimental.

Index

Constants

This section is empty.

Variables

var (

	// ErrUntrustedPlatform is returned from ClientHandshake and
	// ServerHandshake is running on a platform where the trustworthiness of
	// the handshaker service is not guaranteed.
	ErrUntrustedPlatform = errors.New("ALTS: untrusted platform. ALTS is only supported on GCP")
)

Functions

func ClientAuthorizationCheck

func ClientAuthorizationCheck(ctx context.Context, expectedServiceAccounts []string) error

ClientAuthorizationCheck checks whether the client is authorized to access the requested resources based on the given expected client service accounts. This API should be used by gRPC server RPC handlers. This API should not be used by clients.

func NewClientCreds

func NewClientCreds(opts *ClientOptions) credentials.TransportCredentials

NewClientCreds constructs a client-side ALTS TransportCredentials object.

func NewServerCreds

func NewServerCreds(opts *ServerOptions) credentials.TransportCredentials

NewServerCreds constructs a server-side ALTS TransportCredentials object.

Types

type AuthInfo

type AuthInfo interface {
	// ApplicationProtocol returns application protocol negotiated for the
	// ALTS connection.
	ApplicationProtocol() string
	// RecordProtocol returns the record protocol negotiated for the ALTS
	// connection.
	RecordProtocol() string
	// SecurityLevel returns the security level of the created ALTS secure
	// channel.
	SecurityLevel() altspb.SecurityLevel
	// PeerServiceAccount returns the peer service account.
	PeerServiceAccount() string
	// LocalServiceAccount returns the local service account.
	LocalServiceAccount() string
	// PeerRPCVersions returns the RPC version supported by the peer.
	PeerRPCVersions() *altspb.RpcProtocolVersions
}

AuthInfo exposes security information from the ALTS handshake to the application. This interface is to be implemented by ALTS. Users should not need a brand new implementation of this interface. For situations like testing, any new implementation should embed this interface. This allows ALTS to add new methods to this interface.

func AuthInfoFromContext

func AuthInfoFromContext(ctx context.Context) (AuthInfo, error)

AuthInfoFromContext extracts the alts.AuthInfo object from the given context, if it exists. This API should be used by gRPC server RPC handlers to get information about the communicating peer. For client-side, use grpc.Peer() CallOption.

func AuthInfoFromPeer

func AuthInfoFromPeer(p *peer.Peer) (AuthInfo, error)

AuthInfoFromPeer extracts the alts.AuthInfo object from the given peer, if it exists. This API should be used by gRPC clients after obtaining a peer object using the grpc.Peer() CallOption.

type ClientOptions

type ClientOptions struct {
	// TargetServiceAccounts contains a list of expected target service
	// accounts.
	TargetServiceAccounts []string
	// HandshakerServiceAddress represents the ALTS handshaker gRPC service
	// address to connect to.
	HandshakerServiceAddress string
}

ClientOptions contains the client-side options of an ALTS channel. These options will be passed to the underlying ALTS handshaker.

func DefaultClientOptions

func DefaultClientOptions() *ClientOptions

DefaultClientOptions creates a new ClientOptions object with the default values.

type ServerOptions

type ServerOptions struct {
	// HandshakerServiceAddress represents the ALTS handshaker gRPC service
	// address to connect to.
	HandshakerServiceAddress string
}

ServerOptions contains the server-side options of an ALTS channel. These options will be passed to the underlying ALTS handshaker.

func DefaultServerOptions

func DefaultServerOptions() *ServerOptions

DefaultServerOptions creates a new ServerOptions object with the default values.

Source Files

Directories

Path Synopsis
internal Package internal contains common core functionality for ALTS.
internal/authinfo Package authinfo provide authentication information returned by handshakers.
internal/conn Package conn contains an implementation of a secure channel created by gRPC handshakers.
internal/handshaker Package handshaker provides ALTS handshaking functionality for GCP.
internal/handshaker/service Package service manages connections between the VM application and the ALTS handshaker service.
internal/proto/grpc_gcp
internal/testutil Package testutil include useful test utilities for the handshaker.