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logical_system_raft.go
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logical_system_raft.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package vault
import (
"context"
"crypto/subtle"
"encoding/base64"
"errors"
"fmt"
"strings"
"time"
"github.com/golang/protobuf/proto"
wrapping "github.com/hashicorp/go-kms-wrapping/v2"
"github.com/hashicorp/go-uuid"
"github.com/hashicorp/vault/helper/constants"
"github.com/hashicorp/vault/helper/namespace"
"github.com/hashicorp/vault/physical/raft"
"github.com/hashicorp/vault/sdk/framework"
"github.com/hashicorp/vault/sdk/logical"
"github.com/hashicorp/vault/sdk/physical"
"github.com/mitchellh/mapstructure"
)
// raftStoragePaths returns paths for use when raft is the storage mechanism.
func (b *SystemBackend) raftStoragePaths() []*framework.Path {
return []*framework.Path{
{
Pattern: "storage/raft/bootstrap/answer",
Fields: map[string]*framework.FieldSchema{
"server_id": {
Type: framework.TypeString,
},
"answer": {
Type: framework.TypeString,
},
"cluster_addr": {
Type: framework.TypeString,
},
"non_voter": {
Type: framework.TypeBool,
},
},
Operations: map[logical.Operation]framework.OperationHandler{
logical.UpdateOperation: &framework.PathOperation{
Callback: b.handleRaftBootstrapAnswerWrite(),
Summary: "Accepts an answer from the peer to be joined to the fact cluster.",
},
},
HelpSynopsis: strings.TrimSpace(sysRaftHelp["raft-bootstrap-answer"][0]),
HelpDescription: strings.TrimSpace(sysRaftHelp["raft-bootstrap-answer"][1]),
},
{
Pattern: "storage/raft/bootstrap/challenge",
Fields: map[string]*framework.FieldSchema{
"server_id": {
Type: framework.TypeString,
},
},
Operations: map[logical.Operation]framework.OperationHandler{
logical.UpdateOperation: &framework.PathOperation{
Callback: b.handleRaftBootstrapChallengeWrite(),
Summary: "Creates a challenge for the new peer to be joined to the raft cluster.",
},
},
HelpSynopsis: strings.TrimSpace(sysRaftHelp["raft-bootstrap-challenge"][0]),
HelpDescription: strings.TrimSpace(sysRaftHelp["raft-bootstrap-challenge"][1]),
},
{
Pattern: "storage/raft/remove-peer",
Fields: map[string]*framework.FieldSchema{
"dr_operation_token": {
Type: framework.TypeString,
Description: "DR operation token used to authorize this request (if a DR secondary node).",
},
"server_id": {
Type: framework.TypeString,
},
},
Operations: map[logical.Operation]framework.OperationHandler{
logical.UpdateOperation: &framework.PathOperation{
Callback: b.verifyDROperationTokenOnSecondary(b.handleRaftRemovePeerUpdate(), false),
Summary: "Remove a peer from the raft cluster.",
},
},
HelpSynopsis: strings.TrimSpace(sysRaftHelp["raft-remove-peer"][0]),
HelpDescription: strings.TrimSpace(sysRaftHelp["raft-remove-peer"][1]),
},
{
Pattern: "storage/raft/configuration",
Fields: map[string]*framework.FieldSchema{
"dr_operation_token": {
Type: framework.TypeString,
Description: "DR operation token used to authorize this request (if a DR secondary node).",
},
},
Operations: map[logical.Operation]framework.OperationHandler{
logical.ReadOperation: &framework.PathOperation{
Callback: b.handleRaftConfigurationGet(),
Summary: "Returns the configuration of the raft cluster.",
},
// Reading configuration on a DR secondary cluster is an update
// operation to allow consuming the DR operation token for
// authenticating the request.
logical.UpdateOperation: &framework.PathOperation{
Callback: b.verifyDROperationToken(b.handleRaftConfigurationGet(), false),
Summary: "Returns the configuration of the raft cluster in a DR secondary cluster.",
},
},
HelpSynopsis: strings.TrimSpace(sysRaftHelp["raft-configuration"][0]),
HelpDescription: strings.TrimSpace(sysRaftHelp["raft-configuration"][1]),
},
{
Pattern: "storage/raft/snapshot",
Operations: map[logical.Operation]framework.OperationHandler{
logical.ReadOperation: &framework.PathOperation{
Callback: b.handleStorageRaftSnapshotRead(),
Summary: "Returns a snapshot of the current state of vault.",
},
logical.UpdateOperation: &framework.PathOperation{
Callback: b.handleStorageRaftSnapshotWrite(false),
Summary: "Installs the provided snapshot, returning the cluster to the state defined in it.",
},
},
HelpSynopsis: strings.TrimSpace(sysRaftHelp["raft-snapshot"][0]),
HelpDescription: strings.TrimSpace(sysRaftHelp["raft-snapshot"][1]),
},
{
Pattern: "storage/raft/snapshot-force",
Operations: map[logical.Operation]framework.OperationHandler{
logical.UpdateOperation: &framework.PathOperation{
Callback: b.handleStorageRaftSnapshotWrite(true),
Summary: "Installs the provided snapshot, returning the cluster to the state defined in it. This bypasses checks ensuring the current Autounseal or Shamir keys are consistent with the snapshot data.",
},
},
HelpSynopsis: strings.TrimSpace(sysRaftHelp["raft-snapshot-force"][0]),
HelpDescription: strings.TrimSpace(sysRaftHelp["raft-snapshot-force"][1]),
},
{
Pattern: "storage/raft/autopilot/state",
Operations: map[logical.Operation]framework.OperationHandler{
logical.ReadOperation: &framework.PathOperation{
Callback: b.verifyDROperationTokenOnSecondary(b.handleStorageRaftAutopilotState(), false),
Summary: "Returns the state of the raft cluster under integrated storage as seen by autopilot.",
ForwardPerformanceStandby: true,
},
},
HelpSynopsis: strings.TrimSpace(sysRaftHelp["raft-autopilot-state"][0]),
HelpDescription: strings.TrimSpace(sysRaftHelp["raft-autopilot-state"][1]),
},
{
Pattern: "storage/raft/autopilot/configuration",
Fields: map[string]*framework.FieldSchema{
"cleanup_dead_servers": {
Type: framework.TypeBool,
Description: "Controls whether to remove dead servers from the Raft peer list periodically or when a new server joins.",
},
"last_contact_threshold": {
Type: framework.TypeDurationSecond,
Description: "Limit on the amount of time a server can go without leader contact before being considered unhealthy.",
},
"dead_server_last_contact_threshold": {
Type: framework.TypeDurationSecond,
Description: "Limit on the amount of time a server can go without leader contact before being considered failed. This takes effect only when cleanup_dead_servers is set.",
},
"max_trailing_logs": {
Type: framework.TypeInt,
Description: "Amount of entries in the Raft Log that a server can be behind before being considered unhealthy.",
},
"min_quorum": {
Type: framework.TypeInt,
Description: "Minimum number of servers allowed in a cluster before autopilot can prune dead servers. This should at least be 3.",
},
"server_stabilization_time": {
Type: framework.TypeDurationSecond,
Description: "Minimum amount of time a server must be in a stable, healthy state before it can be added to the cluster.",
},
"disable_upgrade_migration": {
Type: framework.TypeBool,
Description: "Whether or not to perform automated version upgrades.",
},
"dr_operation_token": {
Type: framework.TypeString,
Description: "DR operation token used to authorize this request (if a DR secondary node).",
},
},
Operations: map[logical.Operation]framework.OperationHandler{
logical.ReadOperation: &framework.PathOperation{
Callback: b.verifyDROperationTokenOnSecondary(b.handleStorageRaftAutopilotConfigRead(), false),
},
logical.UpdateOperation: &framework.PathOperation{
Callback: b.verifyDROperationTokenOnSecondary(b.handleStorageRaftAutopilotConfigUpdate(), false),
},
},
HelpSynopsis: strings.TrimSpace(sysRaftHelp["raft-autopilot-configuration"][0]),
HelpDescription: strings.TrimSpace(sysRaftHelp["raft-autopilot-configuration"][1]),
},
}
}
func (b *SystemBackend) handleRaftConfigurationGet() framework.OperationFunc {
return func(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
raftBackend := b.Core.getRaftBackend()
if raftBackend == nil {
return logical.ErrorResponse("raft storage is not in use"), logical.ErrInvalidRequest
}
config, err := raftBackend.GetConfiguration(ctx)
if err != nil {
return nil, err
}
return &logical.Response{
Data: map[string]interface{}{
"config": config,
},
}, nil
}
}
func (b *SystemBackend) handleRaftRemovePeerUpdate() framework.OperationFunc {
return func(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
serverID := d.Get("server_id").(string)
if len(serverID) == 0 {
return logical.ErrorResponse("no server id provided"), logical.ErrInvalidRequest
}
raftBackend := b.Core.getRaftBackend()
if raftBackend == nil {
return logical.ErrorResponse("raft storage is not in use"), logical.ErrInvalidRequest
}
if err := raftBackend.RemovePeer(ctx, serverID); err != nil {
return nil, err
}
b.Core.raftFollowerStates.Delete(serverID)
return nil, nil
}
}
func (b *SystemBackend) handleRaftBootstrapChallengeWrite() framework.OperationFunc {
return func(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
serverID := d.Get("server_id").(string)
if len(serverID) == 0 {
return logical.ErrorResponse("no server id provided"), logical.ErrInvalidRequest
}
var answer []byte
answerRaw, ok := b.Core.pendingRaftPeers.Load(serverID)
if !ok {
var err error
answer, err = uuid.GenerateRandomBytes(16)
if err != nil {
return nil, err
}
b.Core.pendingRaftPeers.Store(serverID, answer)
} else {
answer = answerRaw.([]byte)
}
sealAccess := b.Core.seal.GetAccess()
eBlob, err := sealAccess.Encrypt(ctx, answer, nil)
if err != nil {
return nil, err
}
protoBlob, err := proto.Marshal(eBlob)
if err != nil {
return nil, err
}
sealConfig, err := b.Core.seal.BarrierConfig(ctx)
if err != nil {
return nil, err
}
return &logical.Response{
Data: map[string]interface{}{
"challenge": base64.StdEncoding.EncodeToString(protoBlob),
"seal_config": sealConfig,
},
}, nil
}
}
func (b *SystemBackend) handleRaftBootstrapAnswerWrite() framework.OperationFunc {
return func(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
raftBackend := b.Core.getRaftBackend()
if raftBackend == nil {
return logical.ErrorResponse("raft storage is not in use"), logical.ErrInvalidRequest
}
serverID := d.Get("server_id").(string)
if len(serverID) == 0 {
return logical.ErrorResponse("no server_id provided"), logical.ErrInvalidRequest
}
answerRaw := d.Get("answer").(string)
if len(answerRaw) == 0 {
return logical.ErrorResponse("no answer provided"), logical.ErrInvalidRequest
}
clusterAddr := d.Get("cluster_addr").(string)
if len(clusterAddr) == 0 {
return logical.ErrorResponse("no cluster_addr provided"), logical.ErrInvalidRequest
}
nonVoter := d.Get("non_voter").(bool)
answer, err := base64.StdEncoding.DecodeString(answerRaw)
if err != nil {
return logical.ErrorResponse("could not base64 decode answer"), logical.ErrInvalidRequest
}
expectedAnswerRaw, ok := b.Core.pendingRaftPeers.Load(serverID)
if !ok {
return logical.ErrorResponse("no expected answer for the server id provided"), logical.ErrInvalidRequest
}
b.Core.pendingRaftPeers.Delete(serverID)
if subtle.ConstantTimeCompare(answer, expectedAnswerRaw.([]byte)) == 0 {
return logical.ErrorResponse("invalid answer given"), logical.ErrInvalidRequest
}
tlsKeyringEntry, err := b.Core.barrier.Get(ctx, raftTLSStoragePath)
if err != nil {
return nil, err
}
if tlsKeyringEntry == nil {
return nil, errors.New("could not find raft TLS configuration")
}
var keyring raft.TLSKeyring
if err := tlsKeyringEntry.DecodeJSON(&keyring); err != nil {
return nil, errors.New("could not decode raft TLS configuration")
}
var desiredSuffrage string
switch nonVoter {
case true:
desiredSuffrage = "non-voter"
default:
desiredSuffrage = "voter"
}
added := b.Core.raftFollowerStates.Update(&raft.EchoRequestUpdate{
NodeID: serverID,
DesiredSuffrage: desiredSuffrage,
})
switch nonVoter {
case true:
err = raftBackend.AddNonVotingPeer(ctx, serverID, clusterAddr)
default:
err = raftBackend.AddPeer(ctx, serverID, clusterAddr)
}
if err != nil {
if added {
b.Core.raftFollowerStates.Delete(serverID)
}
return nil, err
}
peers, err := raftBackend.Peers(ctx)
if err != nil {
return nil, err
}
b.logger.Info("follower node answered the raft bootstrap challenge", "follower_server_id", serverID)
return &logical.Response{
Data: map[string]interface{}{
"peers": peers,
"tls_keyring": &keyring,
"autoloaded_license": LicenseAutoloaded(b.Core),
},
}, nil
}
}
func (b *SystemBackend) handleStorageRaftSnapshotRead() framework.OperationFunc {
return func(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
raftStorage, ok := b.Core.underlyingPhysical.(*raft.RaftBackend)
if !ok {
return logical.ErrorResponse("raft storage is not in use"), logical.ErrInvalidRequest
}
if req.ResponseWriter == nil {
return nil, errors.New("no writer for request")
}
err := raftStorage.SnapshotHTTP(req.ResponseWriter, b.Core.seal.GetAccess())
if err != nil {
return nil, err
}
return nil, nil
}
}
func (b *SystemBackend) handleStorageRaftAutopilotState() framework.OperationFunc {
return func(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
raftBackend := b.Core.getRaftBackend()
if raftBackend == nil {
return logical.ErrorResponse("raft storage is not in use"), logical.ErrInvalidRequest
}
state, err := raftBackend.GetAutopilotServerState(ctx)
if err != nil {
return nil, err
}
if state == nil {
return nil, nil
}
data := make(map[string]interface{})
err = mapstructure.Decode(state, &data)
if err != nil {
return nil, err
}
return &logical.Response{
Data: data,
}, nil
}
}
func (b *SystemBackend) handleStorageRaftAutopilotConfigRead() framework.OperationFunc {
return func(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
raftBackend := b.Core.getRaftBackend()
if raftBackend == nil {
return logical.ErrorResponse("raft storage is not in use"), logical.ErrInvalidRequest
}
config := raftBackend.AutopilotConfig()
if config == nil {
return nil, nil
}
return &logical.Response{
Data: map[string]interface{}{
"cleanup_dead_servers": config.CleanupDeadServers,
"last_contact_threshold": config.LastContactThreshold.String(),
"dead_server_last_contact_threshold": config.DeadServerLastContactThreshold.String(),
"max_trailing_logs": config.MaxTrailingLogs,
"min_quorum": config.MinQuorum,
"server_stabilization_time": config.ServerStabilizationTime.String(),
"disable_upgrade_migration": config.DisableUpgradeMigration,
},
}, nil
}
}
func (b *SystemBackend) handleStorageRaftAutopilotConfigUpdate() framework.OperationFunc {
return func(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
raftBackend := b.Core.getRaftBackend()
if raftBackend == nil {
return logical.ErrorResponse("raft storage is not in use"), logical.ErrInvalidRequest
}
// Read autopilot configuration from storage
config, err := b.Core.loadAutopilotConfiguration(ctx)
if err != nil {
b.logger.Error("failed to load autopilot config from storage when setting up cluster; continuing since autopilot falls back to default config", "error", err)
}
if config == nil {
config = &raft.AutopilotConfig{}
}
persist := false
cleanupDeadServers, ok := d.GetOk("cleanup_dead_servers")
if ok {
if cleanupDeadServers.(bool) {
config.CleanupDeadServersValue = raft.CleanupDeadServersTrue
} else {
config.CleanupDeadServersValue = raft.CleanupDeadServersFalse
}
persist = true
}
lastContactThreshold, ok := d.GetOk("last_contact_threshold")
if ok {
config.LastContactThreshold = time.Duration(lastContactThreshold.(int)) * time.Second
persist = true
}
deadServerLastContactThreshold, ok := d.GetOk("dead_server_last_contact_threshold")
if ok {
config.DeadServerLastContactThreshold = time.Duration(deadServerLastContactThreshold.(int)) * time.Second
persist = true
}
maxTrailingLogs, ok := d.GetOk("max_trailing_logs")
if ok {
config.MaxTrailingLogs = uint64(maxTrailingLogs.(int))
persist = true
}
minQuorum, ok := d.GetOk("min_quorum")
if ok {
config.MinQuorum = uint(minQuorum.(int))
persist = true
}
serverStabilizationTime, ok := d.GetOk("server_stabilization_time")
if ok {
config.ServerStabilizationTime = time.Duration(serverStabilizationTime.(int)) * time.Second
persist = true
}
disableUpgradeMigration, ok := d.GetOk("disable_upgrade_migration")
if ok {
if !constants.IsEnterprise {
return logical.ErrorResponse("disable_upgrade_migration is only available in Vault Enterprise"), logical.ErrInvalidRequest
}
config.DisableUpgradeMigration = disableUpgradeMigration.(bool)
persist = true
}
effectiveConf := raftBackend.AutopilotConfig()
effectiveConf.Merge(config)
if effectiveConf.CleanupDeadServers && effectiveConf.MinQuorum < 3 {
return logical.ErrorResponse(fmt.Sprintf("min_quorum must be set when cleanup_dead_servers is set and it should at least be 3; cleanup_dead_servers: %#v, min_quorum: %#v", effectiveConf.CleanupDeadServers, effectiveConf.MinQuorum)), logical.ErrInvalidRequest
}
if effectiveConf.CleanupDeadServers && effectiveConf.DeadServerLastContactThreshold.Seconds() < 60 {
return logical.ErrorResponse(fmt.Sprintf("dead_server_last_contact_threshold should not be set to less than 1m; received: %v", deadServerLastContactThreshold)), logical.ErrInvalidRequest
}
// Persist only the user supplied fields
if persist {
entry, err := logical.StorageEntryJSON(raftAutopilotConfigurationStoragePath, config)
if err != nil {
return nil, err
}
if err := b.Core.barrier.Put(ctx, entry); err != nil {
return nil, err
}
}
// Set the effectiveConfig
raftBackend.SetAutopilotConfig(effectiveConf)
return nil, nil
}
}
func (b *SystemBackend) handleStorageRaftSnapshotWrite(force bool) framework.OperationFunc {
return func(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
raftStorage, ok := b.Core.underlyingPhysical.(*raft.RaftBackend)
if !ok {
return logical.ErrorResponse("raft storage is not in use"), logical.ErrInvalidRequest
}
if req.HTTPRequest == nil || req.HTTPRequest.Body == nil {
return nil, errors.New("no reader for request")
}
access := b.Core.seal.GetAccess()
if force {
access = nil
}
// We want to buffer the http request reader into a temp file here so we
// don't have to hold the full snapshot in memory. We also want to do
// the restore in two parts so we can restore the snapshot while the
// stateLock is write locked.
snapFile, cleanup, metadata, err := raftStorage.WriteSnapshotToTemp(req.HTTPRequest.Body, access)
switch {
case err == nil:
case strings.Contains(err.Error(), "failed to open the sealed hashes"):
switch b.Core.seal.BarrierType() {
case wrapping.WrapperTypeShamir:
return logical.ErrorResponse("could not verify hash file, possibly the snapshot is using a different set of unseal keys; use the snapshot-force API to bypass this check"), logical.ErrInvalidRequest
default:
return logical.ErrorResponse("could not verify hash file, possibly the snapshot is using a different autoseal key; use the snapshot-force API to bypass this check"), logical.ErrInvalidRequest
}
case err != nil:
b.Core.logger.Error("raft snapshot restore: failed to write snapshot", "error", err)
return nil, err
}
// We want to do this in a go routine so we can upgrade the lock and
// allow the client to disconnect.
go func() (retErr error) {
// Cleanup the temp file
defer cleanup()
// Grab statelock
l := newLockGrabber(b.Core.stateLock.Lock, b.Core.stateLock.Unlock, b.Core.standbyStopCh.Load().(chan struct{}))
go l.grab()
if stopped := l.lockOrStop(); stopped {
b.Core.logger.Error("not applying snapshot; shutting down")
return
}
defer b.Core.stateLock.Unlock()
// If we failed to restore the snapshot we should seal this node as
// it's in an unknown state
defer func() {
if retErr != nil {
if err := b.Core.sealInternalWithOptions(false, false, true); err != nil {
b.Core.logger.Error("failed to seal node", "error", err)
}
}
}()
ctx, ctxCancel := context.WithCancel(namespace.RootContext(nil))
// We are calling the callback function synchronously here while we
// have the lock. So set it to nil and restore the callback when we
// finish.
raftStorage.SetRestoreCallback(nil)
defer raftStorage.SetRestoreCallback(b.Core.raftSnapshotRestoreCallback(true, true))
// Do a preSeal to clear vault's in-memory caches and shut down any
// systems that might be holding the encryption access.
b.Core.logger.Info("shutting down prior to restoring snapshot")
if err := b.Core.preSeal(); err != nil {
b.Core.logger.Error("raft snapshot restore failed preSeal", "error", err)
return err
}
b.Core.logger.Info("applying snapshot")
if err := raftStorage.RestoreSnapshot(ctx, metadata, snapFile); err != nil {
b.Core.logger.Error("error while restoring raft snapshot", "error", err)
return err
}
// Run invalidation logic synchronously here
callback := b.Core.raftSnapshotRestoreCallback(false, false)
if err := callback(ctx); err != nil {
return err
}
{
// If the snapshot was taken while another node was leader we
// need to reset the leader information to this node.
if err := b.Core.underlyingPhysical.Put(ctx, &physical.Entry{
Key: CoreLockPath,
Value: []byte(b.Core.leaderUUID),
}); err != nil {
b.Core.logger.Error("cluster setup failed", "error", err)
return err
}
// re-advertise our cluster information
if err := b.Core.advertiseLeader(ctx, b.Core.leaderUUID, nil); err != nil {
b.Core.logger.Error("cluster setup failed", "error", err)
return err
}
}
if err := b.Core.postUnseal(ctx, ctxCancel, standardUnsealStrategy{}); err != nil {
b.Core.logger.Error("raft snapshot restore failed postUnseal", "error", err)
return err
}
return nil
}()
return nil, nil
}
}
var sysRaftHelp = map[string][2]string{
"raft-bootstrap-challenge": {
"Creates a challenge for the new peer to be joined to the raft cluster.",
"",
},
"raft-bootstrap-answer": {
"Accepts an answer from the peer to be joined to the fact cluster.",
"",
},
"raft-configuration": {
"Returns the raft cluster configuration.",
`On a DR secondary cluster, instead of a GET, this must be a POST or
PUT, and furthermore a DR operation token must be provided.`,
},
"raft-remove-peer": {
"Removes a peer from the raft cluster.",
"",
},
"raft-snapshot": {
"Restores and saves snapshots from the raft cluster.",
"",
},
"raft-snapshot-force": {
"Force restore a raft cluster snapshot",
"",
},
"raft-autopilot-state": {
"Returns the state of the raft cluster under integrated storage as seen by autopilot.",
"",
},
"raft-autopilot-configuration": {
"Returns autopilot configuration.",
"",
},
}