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cluster.go
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cluster.go
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package vault
import (
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/json"
"errors"
"fmt"
"math/big"
mathrand "math/rand"
"net"
"net/http"
"strings"
"time"
"github.com/hashicorp/errwrap"
uuid "github.com/hashicorp/go-uuid"
"github.com/hashicorp/vault/sdk/helper/jsonutil"
"github.com/hashicorp/vault/sdk/logical"
"github.com/hashicorp/vault/vault/cluster"
)
const (
// Storage path where the local cluster name and identifier are stored
coreLocalClusterInfoPath = "core/cluster/local/info"
corePrivateKeyTypeP521 = "p521"
corePrivateKeyTypeED25519 = "ed25519"
// Internal so as not to log a trace message
IntNoForwardingHeaderName = "X-Vault-Internal-No-Request-Forwarding"
)
var (
ErrCannotForward = errors.New("cannot forward request; no connection or address not known")
ErrCannotForwardLocalOnly = errors.New("cannot forward local-only request")
)
type ClusterLeaderParams struct {
LeaderUUID string
LeaderRedirectAddr string
LeaderClusterAddr string
}
// Structure representing the storage entry that holds cluster information
type Cluster struct {
// Name of the cluster
Name string `json:"name" structs:"name" mapstructure:"name"`
// Identifier of the cluster
ID string `json:"id" structs:"id" mapstructure:"id"`
}
// Cluster fetches the details of the local cluster. This method errors out
// when Vault is sealed.
func (c *Core) Cluster(ctx context.Context) (*Cluster, error) {
var cluster Cluster
// Fetch the storage entry. This call fails when Vault is sealed.
entry, err := c.barrier.Get(ctx, coreLocalClusterInfoPath)
if err != nil {
return nil, err
}
if entry == nil {
return &cluster, nil
}
// Decode the cluster information
if err = jsonutil.DecodeJSON(entry.Value, &cluster); err != nil {
return nil, errwrap.Wrapf("failed to decode cluster details: {{err}}", err)
}
// Set in config file
if c.clusterName != "" {
cluster.Name = c.clusterName
}
return &cluster, nil
}
// This sets our local cluster cert and private key based on the advertisement.
// It also ensures the cert is in our local cluster cert pool.
func (c *Core) loadLocalClusterTLS(adv activeAdvertisement) (retErr error) {
defer func() {
if retErr != nil {
c.localClusterCert.Store(([]byte)(nil))
c.localClusterParsedCert.Store((*x509.Certificate)(nil))
c.localClusterPrivateKey.Store((*ecdsa.PrivateKey)(nil))
c.requestForwardingConnectionLock.Lock()
c.clearForwardingClients()
c.requestForwardingConnectionLock.Unlock()
}
}()
switch {
case adv.ClusterAddr == "":
// Clustering disabled on the server, don't try to look for params
return nil
case adv.ClusterKeyParams == nil:
c.logger.Error("no key params found loading local cluster TLS information")
return fmt.Errorf("no local cluster key params found")
case adv.ClusterKeyParams.X == nil, adv.ClusterKeyParams.Y == nil, adv.ClusterKeyParams.D == nil:
c.logger.Error("failed to parse local cluster key due to missing params")
return fmt.Errorf("failed to parse local cluster key")
case adv.ClusterKeyParams.Type != corePrivateKeyTypeP521:
c.logger.Error("unknown local cluster key type", "key_type", adv.ClusterKeyParams.Type)
return fmt.Errorf("failed to find valid local cluster key type")
case adv.ClusterCert == nil || len(adv.ClusterCert) == 0:
c.logger.Error("no local cluster cert found")
return fmt.Errorf("no local cluster cert found")
}
c.localClusterPrivateKey.Store(&ecdsa.PrivateKey{
PublicKey: ecdsa.PublicKey{
Curve: elliptic.P521(),
X: adv.ClusterKeyParams.X,
Y: adv.ClusterKeyParams.Y,
},
D: adv.ClusterKeyParams.D,
})
locCert := make([]byte, len(adv.ClusterCert))
copy(locCert, adv.ClusterCert)
c.localClusterCert.Store(locCert)
cert, err := x509.ParseCertificate(adv.ClusterCert)
if err != nil {
c.logger.Error("failed parsing local cluster certificate", "error", err)
return errwrap.Wrapf("error parsing local cluster certificate: {{err}}", err)
}
c.localClusterParsedCert.Store(cert)
return nil
}
// setupCluster creates storage entries for holding Vault cluster information.
// Entries will be created only if they are not already present. If clusterName
// is not supplied, this method will auto-generate it.
func (c *Core) setupCluster(ctx context.Context) error {
// Prevent data races with the TLS parameters
c.clusterParamsLock.Lock()
defer c.clusterParamsLock.Unlock()
// Check if storage index is already present or not
cluster, err := c.Cluster(ctx)
if err != nil {
c.logger.Error("failed to get cluster details", "error", err)
return err
}
var modified bool
if cluster == nil {
cluster = &Cluster{}
}
if cluster.Name == "" {
// If cluster name is not supplied, generate one
if c.clusterName == "" {
c.logger.Debug("cluster name not found/set, generating new")
clusterNameBytes, err := uuid.GenerateRandomBytes(4)
if err != nil {
c.logger.Error("failed to generate cluster name", "error", err)
return err
}
c.clusterName = fmt.Sprintf("vault-cluster-%08x", clusterNameBytes)
}
cluster.Name = c.clusterName
if c.logger.IsDebug() {
c.logger.Debug("cluster name set", "name", cluster.Name)
}
modified = true
}
// This is the first point at which the stored (or newly generated)
// cluster name is known.
c.metricSink.SetDefaultClusterName(cluster.Name)
if cluster.ID == "" {
c.logger.Debug("cluster ID not found, generating new")
// Generate a clusterID
cluster.ID, err = uuid.GenerateUUID()
if err != nil {
c.logger.Error("failed to generate cluster identifier", "error", err)
return err
}
if c.logger.IsDebug() {
c.logger.Debug("cluster ID set", "id", cluster.ID)
}
modified = true
}
// If we're using HA, generate server-to-server parameters
if c.ha != nil {
// Create a private key
if c.localClusterPrivateKey.Load().(*ecdsa.PrivateKey) == nil {
c.logger.Debug("generating cluster private key")
key, err := ecdsa.GenerateKey(elliptic.P521(), c.secureRandomReader)
if err != nil {
c.logger.Error("failed to generate local cluster key", "error", err)
return err
}
c.localClusterPrivateKey.Store(key)
}
// Create a certificate
if c.localClusterCert.Load().([]byte) == nil {
c.logger.Debug("generating local cluster certificate")
host, err := uuid.GenerateUUID()
if err != nil {
return err
}
host = fmt.Sprintf("fw-%s", host)
template := &x509.Certificate{
Subject: pkix.Name{
CommonName: host,
},
DNSNames: []string{host},
ExtKeyUsage: []x509.ExtKeyUsage{
x509.ExtKeyUsageServerAuth,
x509.ExtKeyUsageClientAuth,
},
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment | x509.KeyUsageKeyAgreement | x509.KeyUsageCertSign,
SerialNumber: big.NewInt(mathrand.Int63()),
NotBefore: time.Now().Add(-30 * time.Second),
// 30 years of single-active uptime ought to be enough for anybody
NotAfter: time.Now().Add(262980 * time.Hour),
BasicConstraintsValid: true,
IsCA: true,
}
certBytes, err := x509.CreateCertificate(rand.Reader, template, template, c.localClusterPrivateKey.Load().(*ecdsa.PrivateKey).Public(), c.localClusterPrivateKey.Load().(*ecdsa.PrivateKey))
if err != nil {
c.logger.Error("error generating self-signed cert", "error", err)
return errwrap.Wrapf("unable to generate local cluster certificate: {{err}}", err)
}
parsedCert, err := x509.ParseCertificate(certBytes)
if err != nil {
c.logger.Error("error parsing self-signed cert", "error", err)
return errwrap.Wrapf("error parsing generated certificate: {{err}}", err)
}
c.localClusterCert.Store(certBytes)
c.localClusterParsedCert.Store(parsedCert)
}
}
if modified {
// Encode the cluster information into as a JSON string
rawCluster, err := json.Marshal(cluster)
if err != nil {
c.logger.Error("failed to encode cluster details", "error", err)
return err
}
// Store it
err = c.barrier.Put(ctx, &logical.StorageEntry{
Key: coreLocalClusterInfoPath,
Value: rawCluster,
})
if err != nil {
c.logger.Error("failed to store cluster details", "error", err)
return err
}
}
return nil
}
// startClusterListener starts cluster request listeners during unseal. It
// is assumed that the state lock is held while this is run. Right now this
// only starts cluster listeners. Once the listener is started handlers/clients
// can start being registered to it.
func (c *Core) startClusterListener(ctx context.Context) error {
if c.ClusterAddr() == "" {
c.logger.Info("clustering disabled, not starting listeners")
return nil
}
if c.getClusterListener() != nil {
c.logger.Warn("cluster listener is already started")
return nil
}
if c.clusterListenerAddrs == nil || len(c.clusterListenerAddrs) == 0 {
c.logger.Warn("clustering not disabled but no addresses to listen on")
return fmt.Errorf("cluster addresses not found")
}
c.logger.Debug("starting cluster listeners")
networkLayer := c.clusterNetworkLayer
if networkLayer == nil {
networkLayer = cluster.NewTCPLayer(c.clusterListenerAddrs, c.logger.Named("cluster-listener.tcp"))
}
c.clusterListener.Store(cluster.NewListener(networkLayer,
c.clusterCipherSuites,
c.logger.Named("cluster-listener"),
5*c.clusterHeartbeatInterval))
err := c.getClusterListener().Run(ctx)
if err != nil {
return err
}
if strings.HasSuffix(c.ClusterAddr(), ":0") {
// If we listened on port 0, record the port the OS gave us.
c.clusterAddr.Store(fmt.Sprintf("https://%s", c.getClusterListener().Addr()))
}
if len(c.ClusterAddr()) != 0 {
if err := c.getClusterListener().SetAdvertiseAddr(c.ClusterAddr()); err != nil {
return err
}
}
return nil
}
func (c *Core) ClusterAddr() string {
return c.clusterAddr.Load().(string)
}
func (c *Core) getClusterListener() *cluster.Listener {
cl := c.clusterListener.Load()
if cl == nil {
return nil
}
return cl.(*cluster.Listener)
}
// stopClusterListener stops any existing listeners during seal. It is
// assumed that the state lock is held while this is run.
func (c *Core) stopClusterListener() {
clusterListener := c.getClusterListener()
if clusterListener == nil {
c.logger.Debug("clustering disabled, not stopping listeners")
return
}
c.logger.Info("stopping cluster listeners")
clusterListener.Stop()
c.clusterListener.Store((*cluster.Listener)(nil))
c.logger.Info("cluster listeners successfully shut down")
}
func (c *Core) SetClusterListenerAddrs(addrs []*net.TCPAddr) {
c.clusterListenerAddrs = addrs
if c.ClusterAddr() == "" && len(addrs) == 1 {
c.clusterAddr.Store(fmt.Sprintf("https://%s", addrs[0].String()))
}
}
func (c *Core) SetClusterHandler(handler http.Handler) {
c.clusterHandler = handler
}