376 lines
11 KiB
Go
376 lines
11 KiB
Go
package vault
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"crypto/ecdsa"
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"errors"
|
|
"fmt"
|
|
math "math"
|
|
"net/http"
|
|
"net/url"
|
|
"sync"
|
|
"time"
|
|
|
|
log "github.com/hashicorp/go-hclog"
|
|
"github.com/hashicorp/vault/helper/forwarding"
|
|
"github.com/hashicorp/vault/vault/replication"
|
|
cache "github.com/patrickmn/go-cache"
|
|
"golang.org/x/net/http2"
|
|
"google.golang.org/grpc"
|
|
"google.golang.org/grpc/keepalive"
|
|
)
|
|
|
|
const (
|
|
clusterListenerAcceptDeadline = 500 * time.Millisecond
|
|
|
|
// PerformanceReplicationALPN is the negotiated protocol used for
|
|
// performance replication.
|
|
PerformanceReplicationALPN = "replication_v1"
|
|
|
|
// DRReplicationALPN is the negotiated protocol used for
|
|
// dr replication.
|
|
DRReplicationALPN = "replication_dr_v1"
|
|
|
|
perfStandbyALPN = "perf_standby_v1"
|
|
|
|
requestForwardingALPN = "req_fw_sb-act_v1"
|
|
)
|
|
|
|
var (
|
|
// Making this a package var allows tests to modify
|
|
HeartbeatInterval = 5 * time.Second
|
|
)
|
|
|
|
type requestForwardingHandler struct {
|
|
fws *http2.Server
|
|
fwRPCServer *grpc.Server
|
|
logger log.Logger
|
|
ha bool
|
|
core *Core
|
|
stopCh chan struct{}
|
|
}
|
|
|
|
type requestForwardingClusterClient struct {
|
|
core *Core
|
|
}
|
|
|
|
// NewRequestForwardingHandler creates a cluster handler for use with request
|
|
// forwarding.
|
|
func NewRequestForwardingHandler(c *Core, fws *http2.Server, perfStandbySlots chan struct{}, perfStandbyRepCluster *replication.Cluster, perfStandbyCache *cache.Cache) (*requestForwardingHandler, error) {
|
|
// Resolve locally to avoid races
|
|
ha := c.ha != nil
|
|
|
|
fwRPCServer := grpc.NewServer(
|
|
grpc.KeepaliveParams(keepalive.ServerParameters{
|
|
Time: 2 * HeartbeatInterval,
|
|
}),
|
|
grpc.MaxRecvMsgSize(math.MaxInt32),
|
|
grpc.MaxSendMsgSize(math.MaxInt32),
|
|
)
|
|
|
|
if ha && c.clusterHandler != nil {
|
|
RegisterRequestForwardingServer(fwRPCServer, &forwardedRequestRPCServer{
|
|
core: c,
|
|
handler: c.clusterHandler,
|
|
perfStandbySlots: perfStandbySlots,
|
|
perfStandbyRepCluster: perfStandbyRepCluster,
|
|
perfStandbyCache: perfStandbyCache,
|
|
})
|
|
}
|
|
|
|
return &requestForwardingHandler{
|
|
fws: fws,
|
|
fwRPCServer: fwRPCServer,
|
|
ha: ha,
|
|
logger: c.logger.Named("request-forward"),
|
|
core: c,
|
|
stopCh: make(chan struct{}),
|
|
}, nil
|
|
}
|
|
|
|
// ClientLookup satisfies the ClusterClient interface and returns the ha tls
|
|
// client certs.
|
|
func (c *requestForwardingClusterClient) ClientLookup(ctx context.Context, requestInfo *tls.CertificateRequestInfo) (*tls.Certificate, error) {
|
|
parsedCert := c.core.localClusterParsedCert.Load().(*x509.Certificate)
|
|
if parsedCert == nil {
|
|
return nil, nil
|
|
}
|
|
currCert := c.core.localClusterCert.Load().([]byte)
|
|
if len(currCert) == 0 {
|
|
return nil, nil
|
|
}
|
|
localCert := make([]byte, len(currCert))
|
|
copy(localCert, currCert)
|
|
|
|
for _, subj := range requestInfo.AcceptableCAs {
|
|
if bytes.Equal(subj, parsedCert.RawIssuer) {
|
|
return &tls.Certificate{
|
|
Certificate: [][]byte{localCert},
|
|
PrivateKey: c.core.localClusterPrivateKey.Load().(*ecdsa.PrivateKey),
|
|
Leaf: c.core.localClusterParsedCert.Load().(*x509.Certificate),
|
|
}, nil
|
|
}
|
|
}
|
|
|
|
return nil, nil
|
|
}
|
|
|
|
// ServerLookup satisfies the ClusterHandler interface and returns the server's
|
|
// tls certs.
|
|
func (rf *requestForwardingHandler) ServerLookup(ctx context.Context, clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
|
|
currCert := rf.core.localClusterCert.Load().([]byte)
|
|
if len(currCert) == 0 {
|
|
return nil, fmt.Errorf("got forwarding connection but no local cert")
|
|
}
|
|
|
|
localCert := make([]byte, len(currCert))
|
|
copy(localCert, currCert)
|
|
|
|
return &tls.Certificate{
|
|
Certificate: [][]byte{localCert},
|
|
PrivateKey: rf.core.localClusterPrivateKey.Load().(*ecdsa.PrivateKey),
|
|
Leaf: rf.core.localClusterParsedCert.Load().(*x509.Certificate),
|
|
}, nil
|
|
}
|
|
|
|
// CALookup satisfies the ClusterHandler interface and returns the ha ca cert.
|
|
func (rf *requestForwardingHandler) CALookup(ctx context.Context) (*x509.Certificate, error) {
|
|
parsedCert := rf.core.localClusterParsedCert.Load().(*x509.Certificate)
|
|
|
|
if parsedCert == nil {
|
|
return nil, fmt.Errorf("forwarding connection client but no local cert")
|
|
}
|
|
|
|
return parsedCert, nil
|
|
}
|
|
|
|
// Handoff serves a request forwarding connection.
|
|
func (rf *requestForwardingHandler) Handoff(ctx context.Context, shutdownWg *sync.WaitGroup, closeCh chan struct{}, tlsConn *tls.Conn) error {
|
|
if !rf.ha {
|
|
tlsConn.Close()
|
|
return nil
|
|
}
|
|
|
|
rf.logger.Debug("got request forwarding connection")
|
|
|
|
shutdownWg.Add(2)
|
|
// quitCh is used to close the connection and the second
|
|
// goroutine if the server closes before closeCh.
|
|
quitCh := make(chan struct{})
|
|
go func() {
|
|
select {
|
|
case <-quitCh:
|
|
case <-closeCh:
|
|
case <-rf.stopCh:
|
|
}
|
|
tlsConn.Close()
|
|
shutdownWg.Done()
|
|
}()
|
|
|
|
go func() {
|
|
rf.fws.ServeConn(tlsConn, &http2.ServeConnOpts{
|
|
Handler: rf.fwRPCServer,
|
|
BaseConfig: &http.Server{
|
|
ErrorLog: rf.logger.StandardLogger(nil),
|
|
},
|
|
})
|
|
|
|
// close the quitCh which will close the connection and
|
|
// the other goroutine.
|
|
close(quitCh)
|
|
shutdownWg.Done()
|
|
}()
|
|
|
|
return nil
|
|
}
|
|
|
|
// Stop stops the request forwarding server and closes connections.
|
|
func (rf *requestForwardingHandler) Stop() error {
|
|
// Give some time for existing RPCs to drain.
|
|
time.Sleep(clusterListenerAcceptDeadline)
|
|
close(rf.stopCh)
|
|
rf.fwRPCServer.Stop()
|
|
return nil
|
|
}
|
|
|
|
// Starts the listeners and servers necessary to handle forwarded requests
|
|
func (c *Core) startForwarding(ctx context.Context) error {
|
|
c.logger.Debug("cluster listener setup function")
|
|
defer c.logger.Debug("leaving cluster listener setup function")
|
|
|
|
// Clean up in case we have transitioned from a client to a server
|
|
c.requestForwardingConnectionLock.Lock()
|
|
c.clearForwardingClients()
|
|
c.requestForwardingConnectionLock.Unlock()
|
|
|
|
// Resolve locally to avoid races
|
|
if c.ha == nil || c.clusterListener == nil {
|
|
return nil
|
|
}
|
|
|
|
perfStandbyRepCluster, perfStandbyCache, perfStandbySlots, err := c.perfStandbyClusterHandler()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
handler, err := NewRequestForwardingHandler(c, c.clusterListener.Server(), perfStandbySlots, perfStandbyRepCluster, perfStandbyCache)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
c.clusterListener.AddHandler(requestForwardingALPN, handler)
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *Core) stopForwarding() {
|
|
if c.clusterListener != nil {
|
|
c.clusterListener.StopHandler(requestForwardingALPN)
|
|
c.clusterListener.StopHandler(perfStandbyALPN)
|
|
}
|
|
}
|
|
|
|
// refreshRequestForwardingConnection ensures that the client/transport are
|
|
// alive and that the current active address value matches the most
|
|
// recently-known address.
|
|
func (c *Core) refreshRequestForwardingConnection(ctx context.Context, clusterAddr string) error {
|
|
c.logger.Debug("refreshing forwarding connection")
|
|
defer c.logger.Debug("done refreshing forwarding connection")
|
|
|
|
c.requestForwardingConnectionLock.Lock()
|
|
defer c.requestForwardingConnectionLock.Unlock()
|
|
|
|
// Clean things up first
|
|
c.clearForwardingClients()
|
|
|
|
// If we don't have anything to connect to, just return
|
|
if clusterAddr == "" {
|
|
return nil
|
|
}
|
|
|
|
clusterURL, err := url.Parse(clusterAddr)
|
|
if err != nil {
|
|
c.logger.Error("error parsing cluster address attempting to refresh forwarding connection", "error", err)
|
|
return err
|
|
}
|
|
|
|
parsedCert := c.localClusterParsedCert.Load().(*x509.Certificate)
|
|
if parsedCert == nil {
|
|
c.logger.Error("no request forwarding cluster certificate found")
|
|
return errors.New("no request forwarding cluster certificate found")
|
|
}
|
|
|
|
if c.clusterListener != nil {
|
|
c.clusterListener.AddClient(requestForwardingALPN, &requestForwardingClusterClient{
|
|
core: c,
|
|
})
|
|
}
|
|
|
|
// Set up grpc forwarding handling
|
|
// It's not really insecure, but we have to dial manually to get the
|
|
// ALPN header right. It's just "insecure" because GRPC isn't managing
|
|
// the TLS state.
|
|
dctx, cancelFunc := context.WithCancel(ctx)
|
|
c.rpcClientConn, err = grpc.DialContext(dctx, clusterURL.Host,
|
|
grpc.WithDialer(c.getGRPCDialer(ctx, requestForwardingALPN, parsedCert.Subject.CommonName, parsedCert)),
|
|
grpc.WithInsecure(), // it's not, we handle it in the dialer
|
|
grpc.WithKeepaliveParams(keepalive.ClientParameters{
|
|
Time: 2 * HeartbeatInterval,
|
|
}),
|
|
grpc.WithDefaultCallOptions(
|
|
grpc.MaxCallRecvMsgSize(math.MaxInt32),
|
|
grpc.MaxCallSendMsgSize(math.MaxInt32),
|
|
))
|
|
if err != nil {
|
|
cancelFunc()
|
|
c.logger.Error("err setting up forwarding rpc client", "error", err)
|
|
return err
|
|
}
|
|
c.rpcClientConnContext = dctx
|
|
c.rpcClientConnCancelFunc = cancelFunc
|
|
c.rpcForwardingClient = &forwardingClient{
|
|
RequestForwardingClient: NewRequestForwardingClient(c.rpcClientConn),
|
|
core: c,
|
|
echoTicker: time.NewTicker(HeartbeatInterval),
|
|
echoContext: dctx,
|
|
}
|
|
c.rpcForwardingClient.startHeartbeat()
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *Core) clearForwardingClients() {
|
|
c.logger.Debug("clearing forwarding clients")
|
|
defer c.logger.Debug("done clearing forwarding clients")
|
|
|
|
if c.rpcClientConnCancelFunc != nil {
|
|
c.rpcClientConnCancelFunc()
|
|
c.rpcClientConnCancelFunc = nil
|
|
}
|
|
if c.rpcClientConn != nil {
|
|
c.rpcClientConn.Close()
|
|
c.rpcClientConn = nil
|
|
}
|
|
|
|
c.rpcClientConnContext = nil
|
|
c.rpcForwardingClient = nil
|
|
|
|
if c.clusterListener != nil {
|
|
c.clusterListener.RemoveClient(requestForwardingALPN)
|
|
}
|
|
c.clusterLeaderParams.Store((*ClusterLeaderParams)(nil))
|
|
}
|
|
|
|
// ForwardRequest forwards a given request to the active node and returns the
|
|
// response.
|
|
func (c *Core) ForwardRequest(req *http.Request) (int, http.Header, []byte, error) {
|
|
c.requestForwardingConnectionLock.RLock()
|
|
defer c.requestForwardingConnectionLock.RUnlock()
|
|
|
|
if c.rpcForwardingClient == nil {
|
|
return 0, nil, nil, ErrCannotForward
|
|
}
|
|
|
|
origPath := req.URL.Path
|
|
defer func() {
|
|
req.URL.Path = origPath
|
|
}()
|
|
|
|
req.URL.Path = req.Context().Value("original_request_path").(string)
|
|
|
|
freq, err := forwarding.GenerateForwardedRequest(req)
|
|
if err != nil {
|
|
c.logger.Error("error creating forwarding RPC request", "error", err)
|
|
return 0, nil, nil, fmt.Errorf("error creating forwarding RPC request")
|
|
}
|
|
if freq == nil {
|
|
c.logger.Error("got nil forwarding RPC request")
|
|
return 0, nil, nil, fmt.Errorf("got nil forwarding RPC request")
|
|
}
|
|
resp, err := c.rpcForwardingClient.ForwardRequest(c.rpcClientConnContext, freq)
|
|
if err != nil {
|
|
c.logger.Error("error during forwarded RPC request", "error", err)
|
|
return 0, nil, nil, fmt.Errorf("error during forwarding RPC request")
|
|
}
|
|
|
|
var header http.Header
|
|
if resp.HeaderEntries != nil {
|
|
header = make(http.Header)
|
|
for k, v := range resp.HeaderEntries {
|
|
header[k] = v.Values
|
|
}
|
|
}
|
|
|
|
// If we are a perf standby and the request was forwarded to the active node
|
|
// we should attempt to wait for the WAL to ship to offer best effort read after
|
|
// write guarantees
|
|
if c.perfStandby && resp.LastRemoteWal > 0 {
|
|
WaitUntilWALShipped(req.Context(), c, resp.LastRemoteWal)
|
|
}
|
|
|
|
return int(resp.StatusCode), header, resp.Body, nil
|
|
}
|