235 lines
8.9 KiB
Go
235 lines
8.9 KiB
Go
/*
|
|
*
|
|
* Copyright 2014, Google Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following disclaimer
|
|
* in the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* * Neither the name of Google Inc. nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
// Package credentials implements various credentials supported by gRPC library,
|
|
// which encapsulate all the state needed by a client to authenticate with a
|
|
// server and make various assertions, e.g., about the client's identity, role,
|
|
// or whether it is authorized to make a particular call.
|
|
package credentials // import "google.golang.org/grpc/credentials"
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"errors"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"net"
|
|
"strings"
|
|
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
var (
|
|
// alpnProtoStr are the specified application level protocols for gRPC.
|
|
alpnProtoStr = []string{"h2"}
|
|
)
|
|
|
|
// PerRPCCredentials defines the common interface for the credentials which need to
|
|
// attach security information to every RPC (e.g., oauth2).
|
|
type PerRPCCredentials interface {
|
|
// GetRequestMetadata gets the current request metadata, refreshing
|
|
// tokens if required. This should be called by the transport layer on
|
|
// each request, and the data should be populated in headers or other
|
|
// context. uri is the URI of the entry point for the request. When
|
|
// supported by the underlying implementation, ctx can be used for
|
|
// timeout and cancellation.
|
|
// TODO(zhaoq): Define the set of the qualified keys instead of leaving
|
|
// it as an arbitrary string.
|
|
GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error)
|
|
// RequireTransportSecurity indicates whether the credentials requires
|
|
// transport security.
|
|
RequireTransportSecurity() bool
|
|
}
|
|
|
|
// ProtocolInfo provides information regarding the gRPC wire protocol version,
|
|
// security protocol, security protocol version in use, server name, etc.
|
|
type ProtocolInfo struct {
|
|
// ProtocolVersion is the gRPC wire protocol version.
|
|
ProtocolVersion string
|
|
// SecurityProtocol is the security protocol in use.
|
|
SecurityProtocol string
|
|
// SecurityVersion is the security protocol version.
|
|
SecurityVersion string
|
|
// ServerName is the user-configured server name.
|
|
ServerName string
|
|
}
|
|
|
|
// AuthInfo defines the common interface for the auth information the users are interested in.
|
|
type AuthInfo interface {
|
|
AuthType() string
|
|
}
|
|
|
|
var (
|
|
// ErrConnDispatched indicates that rawConn has been dispatched out of gRPC
|
|
// and the caller should not close rawConn.
|
|
ErrConnDispatched = errors.New("credentials: rawConn is dispatched out of gRPC")
|
|
)
|
|
|
|
// TransportCredentials defines the common interface for all the live gRPC wire
|
|
// protocols and supported transport security protocols (e.g., TLS, SSL).
|
|
type TransportCredentials interface {
|
|
// ClientHandshake does the authentication handshake specified by the corresponding
|
|
// authentication protocol on rawConn for clients. It returns the authenticated
|
|
// connection and the corresponding auth information about the connection.
|
|
// Implementations must use the provided context to implement timely cancellation.
|
|
// gRPC will try to reconnect if the error returned is a temporary error
|
|
// (io.EOF, context.DeadlineExceeded or err.Temporary() == true).
|
|
// If the returned error is a wrapper error, implementations should make sure that
|
|
// the error implements Temporary() to have the correct retry behaviors.
|
|
ClientHandshake(context.Context, string, net.Conn) (net.Conn, AuthInfo, error)
|
|
// ServerHandshake does the authentication handshake for servers. It returns
|
|
// the authenticated connection and the corresponding auth information about
|
|
// the connection.
|
|
ServerHandshake(net.Conn) (net.Conn, AuthInfo, error)
|
|
// Info provides the ProtocolInfo of this TransportCredentials.
|
|
Info() ProtocolInfo
|
|
// Clone makes a copy of this TransportCredentials.
|
|
Clone() TransportCredentials
|
|
// OverrideServerName overrides the server name used to verify the hostname on the returned certificates from the server.
|
|
// gRPC internals also use it to override the virtual hosting name if it is set.
|
|
// It must be called before dialing. Currently, this is only used by grpclb.
|
|
OverrideServerName(string) error
|
|
}
|
|
|
|
// TLSInfo contains the auth information for a TLS authenticated connection.
|
|
// It implements the AuthInfo interface.
|
|
type TLSInfo struct {
|
|
State tls.ConnectionState
|
|
}
|
|
|
|
// AuthType returns the type of TLSInfo as a string.
|
|
func (t TLSInfo) AuthType() string {
|
|
return "tls"
|
|
}
|
|
|
|
// tlsCreds is the credentials required for authenticating a connection using TLS.
|
|
type tlsCreds struct {
|
|
// TLS configuration
|
|
config *tls.Config
|
|
}
|
|
|
|
func (c tlsCreds) Info() ProtocolInfo {
|
|
return ProtocolInfo{
|
|
SecurityProtocol: "tls",
|
|
SecurityVersion: "1.2",
|
|
ServerName: c.config.ServerName,
|
|
}
|
|
}
|
|
|
|
func (c *tlsCreds) ClientHandshake(ctx context.Context, addr string, rawConn net.Conn) (_ net.Conn, _ AuthInfo, err error) {
|
|
// use local cfg to avoid clobbering ServerName if using multiple endpoints
|
|
cfg := cloneTLSConfig(c.config)
|
|
if cfg.ServerName == "" {
|
|
colonPos := strings.LastIndex(addr, ":")
|
|
if colonPos == -1 {
|
|
colonPos = len(addr)
|
|
}
|
|
cfg.ServerName = addr[:colonPos]
|
|
}
|
|
conn := tls.Client(rawConn, cfg)
|
|
errChannel := make(chan error, 1)
|
|
go func() {
|
|
errChannel <- conn.Handshake()
|
|
}()
|
|
select {
|
|
case err := <-errChannel:
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
case <-ctx.Done():
|
|
return nil, nil, ctx.Err()
|
|
}
|
|
return conn, TLSInfo{conn.ConnectionState()}, nil
|
|
}
|
|
|
|
func (c *tlsCreds) ServerHandshake(rawConn net.Conn) (net.Conn, AuthInfo, error) {
|
|
conn := tls.Server(rawConn, c.config)
|
|
if err := conn.Handshake(); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
return conn, TLSInfo{conn.ConnectionState()}, nil
|
|
}
|
|
|
|
func (c *tlsCreds) Clone() TransportCredentials {
|
|
return NewTLS(c.config)
|
|
}
|
|
|
|
func (c *tlsCreds) OverrideServerName(serverNameOverride string) error {
|
|
c.config.ServerName = serverNameOverride
|
|
return nil
|
|
}
|
|
|
|
// NewTLS uses c to construct a TransportCredentials based on TLS.
|
|
func NewTLS(c *tls.Config) TransportCredentials {
|
|
tc := &tlsCreds{cloneTLSConfig(c)}
|
|
tc.config.NextProtos = alpnProtoStr
|
|
return tc
|
|
}
|
|
|
|
// NewClientTLSFromCert constructs TLS credentials from the input certificate for client.
|
|
// serverNameOverride is for testing only. If set to a non empty string,
|
|
// it will override the virtual host name of authority (e.g. :authority header field) in requests.
|
|
func NewClientTLSFromCert(cp *x509.CertPool, serverNameOverride string) TransportCredentials {
|
|
return NewTLS(&tls.Config{ServerName: serverNameOverride, RootCAs: cp})
|
|
}
|
|
|
|
// NewClientTLSFromFile constructs TLS credentials from the input certificate file for client.
|
|
// serverNameOverride is for testing only. If set to a non empty string,
|
|
// it will override the virtual host name of authority (e.g. :authority header field) in requests.
|
|
func NewClientTLSFromFile(certFile, serverNameOverride string) (TransportCredentials, error) {
|
|
b, err := ioutil.ReadFile(certFile)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
cp := x509.NewCertPool()
|
|
if !cp.AppendCertsFromPEM(b) {
|
|
return nil, fmt.Errorf("credentials: failed to append certificates")
|
|
}
|
|
return NewTLS(&tls.Config{ServerName: serverNameOverride, RootCAs: cp}), nil
|
|
}
|
|
|
|
// NewServerTLSFromCert constructs TLS credentials from the input certificate for server.
|
|
func NewServerTLSFromCert(cert *tls.Certificate) TransportCredentials {
|
|
return NewTLS(&tls.Config{Certificates: []tls.Certificate{*cert}})
|
|
}
|
|
|
|
// NewServerTLSFromFile constructs TLS credentials from the input certificate file and key
|
|
// file for server.
|
|
func NewServerTLSFromFile(certFile, keyFile string) (TransportCredentials, error) {
|
|
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return NewTLS(&tls.Config{Certificates: []tls.Certificate{cert}}), nil
|
|
}
|