mirror of
https://github.com/etcd-io/etcd.git
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118 lines
3.3 KiB
Go
118 lines
3.3 KiB
Go
// Copyright 2019 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package credentials implements gRPC credential interface with etcd specific logic.
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// e.g., client handshake with custom authority parameter
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package credentials
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import (
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"context"
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"crypto/tls"
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"net"
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"sync"
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"go.etcd.io/etcd/etcdserver/api/v3rpc/rpctypes"
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grpccredentials "google.golang.org/grpc/credentials"
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)
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// Config defines gRPC credential configuration.
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type Config struct {
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TLSConfig *tls.Config
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AuthToken string
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}
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// NewBundle constructs a new gRPC credential bundle.
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func NewBundle(cfg Config) grpccredentials.Bundle {
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return &bundle{
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tc: newTransportCredential(cfg.TLSConfig),
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rc: newPerRPCCredential(cfg.AuthToken),
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}
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}
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// bundle implements "grpccredentials.Bundle" interface.
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type bundle struct {
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tc *transportCredential
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rc *perRPCCredential
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}
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func (b *bundle) TransportCredentials() grpccredentials.TransportCredentials {
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return b.tc
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}
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func (b *bundle) PerRPCCredentials() grpccredentials.PerRPCCredentials {
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return b.rc
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}
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func (b *bundle) NewWithMode(mode string) (grpccredentials.Bundle, error) {
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// no-op
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return nil, nil
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}
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// transportCredential implements "grpccredentials.TransportCredentials" interface.
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type transportCredential struct {
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gtc grpccredentials.TransportCredentials
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}
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func newTransportCredential(cfg *tls.Config) *transportCredential {
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return &transportCredential{
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gtc: grpccredentials.NewTLS(cfg),
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}
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}
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func (tc *transportCredential) ClientHandshake(ctx context.Context, authority string, rawConn net.Conn) (net.Conn, grpccredentials.AuthInfo, error) {
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return tc.gtc.ClientHandshake(ctx, authority, rawConn)
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}
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func (tc *transportCredential) ServerHandshake(rawConn net.Conn) (net.Conn, grpccredentials.AuthInfo, error) {
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return tc.gtc.ServerHandshake(rawConn)
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}
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func (tc *transportCredential) Info() grpccredentials.ProtocolInfo {
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return tc.gtc.Info()
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}
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func (tc *transportCredential) Clone() grpccredentials.TransportCredentials {
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return &transportCredential{
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gtc: tc.gtc.Clone(),
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}
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}
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func (tc *transportCredential) OverrideServerName(serverNameOverride string) error {
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return tc.gtc.OverrideServerName(serverNameOverride)
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}
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// perRPCCredential implements "grpccredentials.PerRPCCredentials" interface.
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type perRPCCredential struct {
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authToken string
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authTokenMu sync.RWMutex
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}
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func newPerRPCCredential(authToken string) *perRPCCredential {
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if authToken == "" {
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return nil
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}
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return &perRPCCredential{
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authToken: authToken,
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}
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}
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func (rc *perRPCCredential) RequireTransportSecurity() bool { return false }
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func (rc *perRPCCredential) GetRequestMetadata(ctx context.Context, s ...string) (map[string]string, error) {
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rc.authTokenMu.RLock()
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authToken := rc.authToken
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rc.authTokenMu.RUnlock()
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return map[string]string{rpctypes.TokenFieldNameGRPC: authToken}, nil
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}
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