agent/cache: Store leases in-order in persistent cache so that restore respects dependencies (#12843)

changelog/12843.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+agent/cache: Process persistent cache leases in dependency order during restore to ensure child leases are always correctly restored
+```

command/agent/cache/cacheboltdb/bolt.go

@@ -2,6 +2,7 @@ package cacheboltdb
 
 import (
 	"context"
+	"encoding/binary"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -17,7 +18,7 @@ import (
 const (
 	// Keep track of schema version for future migrations
 	storageVersionKey = "version"
-	storageVersion    = "1"
+	storageVersion    = "2" // v2 merges auth-lease and secret-lease buckets into one ordered bucket
 
 	// DatabaseFileName - filename for the persistent cache file
 	DatabaseFileName = "vault-agent-cache.db"
@@ -26,15 +27,29 @@ const (
 	// bootstrapping keys
 	metaBucketName = "meta"
 
-	// SecretLeaseType - Bucket/type for leases with secret info
-	SecretLeaseType = "secret-lease"
+	// DEPRECATED: secretLeaseType - v1 Bucket/type for leases with secret info
+	secretLeaseType = "secret-lease"
 
-	// AuthLeaseType - Bucket/type for leases with auth info
-	AuthLeaseType = "auth-lease"
+	// DEPRECATED: authLeaseType - v1 Bucket/type for leases with auth info
+	authLeaseType = "auth-lease"
 
 	// TokenType - Bucket/type for auto-auth tokens
 	TokenType = "token"
 
+	// LeaseType - v2 Bucket/type for auth AND secret leases.
+	//
+	// This bucket stores keys in the same order they were created using
+	// auto-incrementing keys and the fact that BoltDB stores keys in byte
+	// slice order. This means when we iterate through this bucket during
+	// restore, we will always restore parent tokens before their children,
+	// allowing us to correctly attach child contexts to their parent's context.
+	LeaseType = "lease"
+
+	// lookupType - v2 Bucket/type to map from a memcachedb index ID to an
+	// auto-incrementing BoltDB key. Facilitates deletes from the lease
+	// bucket using an ID instead of the auto-incrementing BoltDB key.
+	lookupType = "lookup"
+
 	// AutoAuthToken - key for the latest auto-auth token
 	AutoAuthToken = "auto-auth-token"
 
@@ -71,7 +86,7 @@ func NewBoltStorage(config *BoltStorageConfig) (*BoltStorage, error) {
 		return nil, err
 	}
 	err = db.Update(func(tx *bolt.Tx) error {
-		return createBoltSchema(tx)
+		return createBoltSchema(tx, storageVersion)
 	})
 	if err != nil {
 		return nil, err
@@ -85,41 +100,132 @@ func NewBoltStorage(config *BoltStorageConfig) (*BoltStorage, error) {
 	return bs, nil
 }
 
-func createBoltSchema(tx *bolt.Tx) error {
-	// create the meta bucket at the top level
+func createBoltSchema(tx *bolt.Tx, createVersion string) error {
+	switch {
+	case createVersion == "1":
+		if err := createV1BoltSchema(tx); err != nil {
+			return err
+		}
+	case createVersion == "2":
+		if err := createV2BoltSchema(tx); err != nil {
+			return err
+		}
+	default:
+		return fmt.Errorf("schema version %s not supported", createVersion)
+	}
+
 	meta, err := tx.CreateBucketIfNotExists([]byte(metaBucketName))
 	if err != nil {
 		return fmt.Errorf("failed to create bucket %s: %w", metaBucketName, err)
 	}
-	// check and set file version in the meta bucket
+
+	// Check and set file version in the meta bucket.
 	version := meta.Get([]byte(storageVersionKey))
 	switch {
 	case version == nil:
-		err = meta.Put([]byte(storageVersionKey), []byte(storageVersion))
+		err = meta.Put([]byte(storageVersionKey), []byte(createVersion))
 		if err != nil {
 			return fmt.Errorf("failed to set storage version: %w", err)
 		}
-	case string(version) != storageVersion:
-		return fmt.Errorf("storage migration from %s to %s not implemented", string(version), storageVersion)
+
+		return nil
+
+	case string(version) == createVersion:
+		return nil
+
+	case string(version) == "1" && createVersion == "2":
+		return migrateFromV1ToV2Schema(tx)
+
+	default:
+		return fmt.Errorf("storage migration from %s to %s not implemented", string(version), createVersion)
+	}
 }
 
-	// create the buckets for tokens and leases
-	_, err = tx.CreateBucketIfNotExists([]byte(TokenType))
-	if err != nil {
-		return fmt.Errorf("failed to create token bucket: %w", err)
+func createV1BoltSchema(tx *bolt.Tx) error {
+	// Create the buckets for tokens and leases.
+	for _, bucket := range []string{TokenType, authLeaseType, secretLeaseType} {
+		if _, err := tx.CreateBucketIfNotExists([]byte(bucket)); err != nil {
+			return fmt.Errorf("failed to create %s bucket: %w", bucket, err)
 		}
-	_, err = tx.CreateBucketIfNotExists([]byte(AuthLeaseType))
-	if err != nil {
-		return fmt.Errorf("failed to create auth lease bucket: %w", err)
-	}
-	_, err = tx.CreateBucketIfNotExists([]byte(SecretLeaseType))
-	if err != nil {
-		return fmt.Errorf("failed to create secret lease bucket: %w", err)
 	}
 
 	return nil
 }
 
+func createV2BoltSchema(tx *bolt.Tx) error {
+	// Create the buckets for tokens and leases.
+	for _, bucket := range []string{TokenType, LeaseType, lookupType} {
+		if _, err := tx.CreateBucketIfNotExists([]byte(bucket)); err != nil {
+			return fmt.Errorf("failed to create %s bucket: %w", bucket, err)
+		}
+	}
+
+	return nil
+}
+
+func migrateFromV1ToV2Schema(tx *bolt.Tx) error {
+	if err := createV2BoltSchema(tx); err != nil {
+		return err
+	}
+
+	for _, v1BucketType := range []string{authLeaseType, secretLeaseType} {
+		if bucket := tx.Bucket([]byte(v1BucketType)); bucket != nil {
+			bucket.ForEach(func(key, value []byte) error {
+				autoIncKey, err := autoIncrementedLeaseKey(tx, string(key))
+				if err != nil {
+					return fmt.Errorf("error migrating %s %q key to auto incremented key: %w", v1BucketType, string(key), err)
+				}
+				if err := tx.Bucket([]byte(LeaseType)).Put(autoIncKey, value); err != nil {
+					return fmt.Errorf("error migrating %s %q from v1 to v2 schema: %w", v1BucketType, string(key), err)
+				}
+				return nil
+			})
+
+			if err := tx.DeleteBucket([]byte(v1BucketType)); err != nil {
+				return fmt.Errorf("failed to clean up %s bucket during v1 to v2 schema migration: %w", v1BucketType, err)
+			}
+		}
+	}
+
+	meta, err := tx.CreateBucketIfNotExists([]byte(metaBucketName))
+	if err != nil {
+		return fmt.Errorf("failed to create meta bucket: %w", err)
+	}
+	if err := meta.Put([]byte(storageVersionKey), []byte(storageVersion)); err != nil {
+		return fmt.Errorf("failed to update schema from v1 to v2: %w", err)
+	}
+
+	return nil
+}
+
+func autoIncrementedLeaseKey(tx *bolt.Tx, id string) ([]byte, error) {
+	leaseBucket := tx.Bucket([]byte(LeaseType))
+	keyValue, err := leaseBucket.NextSequence()
+	if err != nil {
+		return nil, fmt.Errorf("failed to generate lookup key for id %q: %w", id, err)
+	}
+
+	key := make([]byte, 8)
+	// MUST be big endian, because keys are ordered by byte slice comparison
+	// which progressively compares each byte in the slice starting at index 0.
+	// BigEndian in the range [255-257] looks like this:
+	// [0 0 0 0 0 0 0 255]
+	// [0 0 0 0 0 0 1 0]
+	// [0 0 0 0 0 0 1 1]
+	// LittleEndian in the same range looks like this:
+	// [255 0 0 0 0 0 0 0]
+	// [0 1 0 0 0 0 0 0]
+	// [1 1 0 0 0 0 0 0]
+	binary.BigEndian.PutUint64(key, keyValue)
+
+	err = tx.Bucket([]byte(lookupType)).Put([]byte(id), key)
+	if err != nil {
+		return nil, err
+	}
+
+	return key, nil
+}
+
 // Set an index (token or lease) in bolt storage
 func (b *BoltStorage) Set(ctx context.Context, id string, plaintext []byte, indexType string) error {
 	blob, err := b.wrapper.Encrypt(ctx, plaintext, []byte(b.aad))
@@ -133,44 +239,56 @@ func (b *BoltStorage) Set(ctx context.Context, id string, plaintext []byte, inde
 	}
 
 	return b.db.Update(func(tx *bolt.Tx) error {
-		s := tx.Bucket([]byte(indexType))
-		if s == nil {
-			return fmt.Errorf("bucket %q not found", indexType)
+		var key []byte
+		switch indexType {
+		case LeaseType:
+			// If this is a lease type, generate an auto-incrementing key and
+			// store an ID -> key lookup entry
+			key, err = autoIncrementedLeaseKey(tx, id)
+			if err != nil {
+				return err
 			}
+		case TokenType:
 			// If this is an auto-auth token, also stash it in the meta bucket for
 			// easy retrieval upon restore
-		if indexType == TokenType {
+			key = []byte(id)
 			meta := tx.Bucket([]byte(metaBucketName))
 			if err := meta.Put([]byte(AutoAuthToken), protoBlob); err != nil {
 				return fmt.Errorf("failed to set latest auto-auth token: %w", err)
 			}
+		default:
+			return fmt.Errorf("called Set for unsupported type %q", indexType)
 		}
-		return s.Put([]byte(id), protoBlob)
+		s := tx.Bucket([]byte(indexType))
+		if s == nil {
+			return fmt.Errorf("bucket %q not found", indexType)
+		}
+		return s.Put(key, protoBlob)
 	})
 }
 
-func getBucketIDs(b *bolt.Bucket) ([][]byte, error) {
-	ids := [][]byte{}
-	err := b.ForEach(func(k, v []byte) error {
-		ids = append(ids, k)
-		return nil
-	})
-	return ids, err
-}
-
-// Delete an index (token or lease) by id from bolt storage
-func (b *BoltStorage) Delete(id string) error {
+// Delete an index (token or lease) by key from bolt storage
+func (b *BoltStorage) Delete(id string, indexType string) error {
 	return b.db.Update(func(tx *bolt.Tx) error {
-		// Since Delete returns a nil error if the key doesn't exist, just call
-		// delete in all three index buckets without checking existence first
-		if err := tx.Bucket([]byte(TokenType)).Delete([]byte(id)); err != nil {
-			return fmt.Errorf("failed to delete %q from token bucket: %w", id, err)
+		key := []byte(id)
+		if indexType == LeaseType {
+			key = tx.Bucket([]byte(lookupType)).Get(key)
+			if key == nil {
+				return fmt.Errorf("failed to lookup bolt DB key for id %q", id)
 			}
-		if err := tx.Bucket([]byte(AuthLeaseType)).Delete([]byte(id)); err != nil {
-			return fmt.Errorf("failed to delete %q from auth lease bucket: %w", id, err)
+
+			err := tx.Bucket([]byte(lookupType)).Delete([]byte(id))
+			if err != nil {
+				return fmt.Errorf("failed to delete %q from lookup bucket: %w", id, err)
 			}
-		if err := tx.Bucket([]byte(SecretLeaseType)).Delete([]byte(id)); err != nil {
-			return fmt.Errorf("failed to delete %q from secret lease bucket: %w", id, err)
+		}
+
+		bucket := tx.Bucket([]byte(indexType))
+		if bucket == nil {
+			return fmt.Errorf("bucket %q not found during delete", indexType)
+		}
+		if err := bucket.Delete(key); err != nil {
+			return fmt.Errorf("failed to delete %q from %q bucket: %w", id, indexType, err)
 		}
 		b.logger.Trace("deleted index from bolt db", "id", id)
 		return nil
@@ -193,10 +311,14 @@ func (b *BoltStorage) GetByType(ctx context.Context, indexType string) ([][]byte
 	err := b.db.View(func(tx *bolt.Tx) error {
 		var errors *multierror.Error
 
-		tx.Bucket([]byte(indexType)).ForEach(func(id, ciphertext []byte) error {
+		bucket := tx.Bucket([]byte(indexType))
+		if bucket == nil {
+			return fmt.Errorf("bucket %q not found", indexType)
+		}
+		bucket.ForEach(func(key, ciphertext []byte) error {
 			plaintext, err := b.decrypt(ctx, ciphertext)
 			if err != nil {
-				errors = multierror.Append(errors, fmt.Errorf("error decrypting index id %s: %w", id, err))
+				errors = multierror.Append(errors, fmt.Errorf("error decrypting entry %s: %w", key, err))
 				return nil
 			}
 
@@ -247,11 +369,11 @@ func (b *BoltStorage) GetRetrievalToken() ([]byte, error) {
 	var token []byte
 
 	err := b.db.View(func(tx *bolt.Tx) error {
-		keyBucket := tx.Bucket([]byte(metaBucketName))
-		if keyBucket == nil {
+		metaBucket := tx.Bucket([]byte(metaBucketName))
+		if metaBucket == nil {
 			return fmt.Errorf("bucket %q not found", metaBucketName)
 		}
-		value := keyBucket.Get([]byte(RetrievalTokenMaterial))
+		value := metaBucket.Get([]byte(RetrievalTokenMaterial))
 		if value != nil {
 			token = make([]byte, len(value))
 			copy(token, value)
@@ -286,13 +408,13 @@ func (b *BoltStorage) Close() error {
 // the schema/layout
 func (b *BoltStorage) Clear() error {
 	return b.db.Update(func(tx *bolt.Tx) error {
-		for _, name := range []string{AuthLeaseType, SecretLeaseType, TokenType} {
+		for _, name := range []string{TokenType, LeaseType, lookupType} {
 			b.logger.Trace("deleting bolt bucket", "name", name)
 			if err := tx.DeleteBucket([]byte(name)); err != nil {
 				return err
 			}
 		}
-		return createBoltSchema(tx)
+		return createBoltSchema(tx, storageVersion)
 	})
 }
 

command/agent/cache/cacheboltdb/bolt_test.go

@@ -2,15 +2,21 @@ package cacheboltdb
 
 import (
 	"context"
+	"fmt"
 	"io/ioutil"
 	"os"
 	"path"
+	"path/filepath"
+	"strings"
 	"testing"
+	"time"
 
+	"github.com/golang/protobuf/proto"
 	"github.com/hashicorp/go-hclog"
 	"github.com/hashicorp/vault/command/agent/cache/keymanager"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	bolt "go.etcd.io/bbolt"
 )
 
 func getTestKeyManager(t *testing.T) keymanager.KeyManager {
@@ -36,13 +42,13 @@ func TestBolt_SetGet(t *testing.T) {
 	})
 	require.NoError(t, err)
 
-	secrets, err := b.GetByType(ctx, SecretLeaseType)
+	secrets, err := b.GetByType(ctx, LeaseType)
 	assert.NoError(t, err)
 	require.Len(t, secrets, 0)
 
-	err = b.Set(ctx, "test1", []byte("hello"), SecretLeaseType)
+	err = b.Set(ctx, "test1", []byte("hello"), LeaseType)
 	assert.NoError(t, err)
-	secrets, err = b.GetByType(ctx, SecretLeaseType)
+	secrets, err = b.GetByType(ctx, LeaseType)
 	assert.NoError(t, err)
 	require.Len(t, secrets, 1)
 	assert.Equal(t, []byte("hello"), secrets[0])
@@ -62,19 +68,19 @@ func TestBoltDelete(t *testing.T) {
 	})
 	require.NoError(t, err)
 
-	err = b.Set(ctx, "secret-test1", []byte("hello1"), SecretLeaseType)
+	err = b.Set(ctx, "secret-test1", []byte("hello1"), LeaseType)
 	require.NoError(t, err)
-	err = b.Set(ctx, "secret-test2", []byte("hello2"), SecretLeaseType)
+	err = b.Set(ctx, "secret-test2", []byte("hello2"), LeaseType)
 	require.NoError(t, err)
 
-	secrets, err := b.GetByType(ctx, SecretLeaseType)
+	secrets, err := b.GetByType(ctx, LeaseType)
 	require.NoError(t, err)
 	assert.Len(t, secrets, 2)
 	assert.ElementsMatch(t, [][]byte{[]byte("hello1"), []byte("hello2")}, secrets)
 
-	err = b.Delete("secret-test1")
+	err = b.Delete("secret-test1", LeaseType)
 	require.NoError(t, err)
-	secrets, err = b.GetByType(ctx, SecretLeaseType)
+	secrets, err = b.GetByType(ctx, LeaseType)
 	require.NoError(t, err)
 	require.Len(t, secrets, 1)
 	assert.Equal(t, []byte("hello2"), secrets[0])
@@ -95,19 +101,20 @@ func TestBoltClear(t *testing.T) {
 	require.NoError(t, err)
 
 	// Populate the bolt db
-	err = b.Set(ctx, "secret-test1", []byte("hello"), SecretLeaseType)
+	err = b.Set(ctx, "secret-test1", []byte("hello1"), LeaseType)
 	require.NoError(t, err)
-	secrets, err := b.GetByType(ctx, SecretLeaseType)
+	secrets, err := b.GetByType(ctx, LeaseType)
 	require.NoError(t, err)
 	require.Len(t, secrets, 1)
-	assert.Equal(t, []byte("hello"), secrets[0])
+	assert.Equal(t, []byte("hello1"), secrets[0])
 
-	err = b.Set(ctx, "auth-test1", []byte("hello"), AuthLeaseType)
+	err = b.Set(ctx, "auth-test1", []byte("hello2"), LeaseType)
 	require.NoError(t, err)
-	auths, err := b.GetByType(ctx, AuthLeaseType)
+	auths, err := b.GetByType(ctx, LeaseType)
 	require.NoError(t, err)
-	require.Len(t, auths, 1)
-	assert.Equal(t, []byte("hello"), auths[0])
+	require.Len(t, auths, 2)
+	assert.Equal(t, []byte("hello1"), auths[0])
+	assert.Equal(t, []byte("hello2"), auths[1])
 
 	err = b.Set(ctx, "token-test1", []byte("hello"), TokenType)
 	require.NoError(t, err)
@@ -119,10 +126,7 @@ func TestBoltClear(t *testing.T) {
 	// Clear the bolt db, and check that it's indeed clear
 	err = b.Clear()
 	require.NoError(t, err)
-	secrets, err = b.GetByType(ctx, SecretLeaseType)
-	require.NoError(t, err)
-	assert.Len(t, secrets, 0)
-	auths, err = b.GetByType(ctx, AuthLeaseType)
+	auths, err = b.GetByType(ctx, LeaseType)
 	require.NoError(t, err)
 	assert.Len(t, auths, 0)
 	tokens, err = b.GetByType(ctx, TokenType)
@@ -259,3 +263,116 @@ func Test_SetGetRetrievalToken(t *testing.T) {
 		})
 	}
 }
+
+func TestBolt_MigrateFromV1ToV2Schema(t *testing.T) {
+	ctx := context.Background()
+
+	path, err := ioutil.TempDir("", "bolt-test")
+	require.NoError(t, err)
+	defer os.RemoveAll(path)
+
+	dbPath := filepath.Join(path, DatabaseFileName)
+	db, err := bolt.Open(dbPath, 0o600, &bolt.Options{Timeout: 1 * time.Second})
+	require.NoError(t, err)
+	err = db.Update(func(tx *bolt.Tx) error {
+		return createBoltSchema(tx, "1")
+	})
+	require.NoError(t, err)
+	b := &BoltStorage{
+		db:      db,
+		logger:  hclog.Default(),
+		wrapper: getTestKeyManager(t).Wrapper(),
+	}
+
+	// Manually insert some items into the v1 schema.
+	err = db.Update(func(tx *bolt.Tx) error {
+		blob, err := b.wrapper.Encrypt(ctx, []byte("ignored-contents"), []byte(""))
+		if err != nil {
+			return fmt.Errorf("error encrypting contents: %w", err)
+		}
+		protoBlob, err := proto.Marshal(blob)
+		if err != nil {
+			return err
+		}
+
+		if err := tx.Bucket([]byte(authLeaseType)).Put([]byte("test-auth-id-1"), protoBlob); err != nil {
+			return err
+		}
+		if err := tx.Bucket([]byte(authLeaseType)).Put([]byte("test-auth-id-2"), protoBlob); err != nil {
+			return err
+		}
+		if err := tx.Bucket([]byte(secretLeaseType)).Put([]byte("test-secret-id-1"), protoBlob); err != nil {
+			return err
+		}
+
+		return nil
+	})
+	require.NoError(t, err)
+
+	// Check we have the contents we would expect for the v1 schema.
+	leases, err := b.GetByType(ctx, authLeaseType)
+	require.NoError(t, err)
+	assert.Len(t, leases, 2)
+	leases, err = b.GetByType(ctx, secretLeaseType)
+	require.NoError(t, err)
+	assert.Len(t, leases, 1)
+	leases, err = b.GetByType(ctx, LeaseType)
+	require.Error(t, err)
+	assert.True(t, strings.Contains(err.Error(), "not found"))
+
+	// Now migrate to the v2 schema.
+	err = db.Update(migrateFromV1ToV2Schema)
+	require.NoError(t, err)
+
+	// Check all the leases have been migrated into one bucket.
+	leases, err = b.GetByType(ctx, authLeaseType)
+	require.Error(t, err)
+	assert.True(t, strings.Contains(err.Error(), "not found"))
+	leases, err = b.GetByType(ctx, secretLeaseType)
+	require.Error(t, err)
+	assert.True(t, strings.Contains(err.Error(), "not found"))
+	leases, err = b.GetByType(ctx, LeaseType)
+	require.NoError(t, err)
+	assert.Len(t, leases, 3)
+}
+
+func TestBolt_MigrateFromInvalidToV2Schema(t *testing.T) {
+	ctx := context.Background()
+
+	path, err := ioutil.TempDir("", "bolt-test")
+	require.NoError(t, err)
+	defer os.RemoveAll(path)
+
+	dbPath := filepath.Join(path, DatabaseFileName)
+	db, err := bolt.Open(dbPath, 0o600, &bolt.Options{Timeout: 1 * time.Second})
+	require.NoError(t, err)
+	b := &BoltStorage{
+		db:      db,
+		logger:  hclog.Default(),
+		wrapper: getTestKeyManager(t).Wrapper(),
+	}
+
+	// All GetByType calls should fail as there's no schema
+	for _, bucket := range []string{authLeaseType, secretLeaseType, LeaseType} {
+		_, err = b.GetByType(ctx, bucket)
+		require.Error(t, err)
+		assert.True(t, strings.Contains(err.Error(), "not found"))
+	}
+
+	// Now migrate to the v2 schema.
+	err = db.Update(migrateFromV1ToV2Schema)
+	require.NoError(t, err)
+
+	// Deprecated auth and secret lease buckets still shouldn't exist
+	// All GetByType calls should fail as there's no schema
+	for _, bucket := range []string{authLeaseType, secretLeaseType} {
+		_, err = b.GetByType(ctx, bucket)
+		require.Error(t, err)
+		assert.True(t, strings.Contains(err.Error(), "not found"))
+	}
+
+	// GetByType for LeaseType should now return an empty result
+	leases, err := b.GetByType(ctx, LeaseType)
+	require.NoError(t, err)
+	require.Len(t, leases, 0)
+}

command/agent/cache/lease_cache.go

@@ -357,7 +357,7 @@ func (c *LeaseCache) Send(ctx context.Context, req *SendRequest) (*SendResponse,
 		index.Lease = secret.LeaseID
 		index.LeaseToken = req.Token
 
-		index.Type = cacheboltdb.SecretLeaseType
+		index.Type = cacheboltdb.LeaseType
 
 	case secret.Auth != nil:
 		c.logger.Debug("processing auth response", "method", req.Request.Method, "path", req.Request.URL.Path)
@@ -387,7 +387,7 @@ func (c *LeaseCache) Send(ctx context.Context, req *SendRequest) (*SendResponse,
 		index.Token = secret.Auth.ClientToken
 		index.TokenAccessor = secret.Auth.Accessor
 
-		index.Type = cacheboltdb.AuthLeaseType
+		index.Type = cacheboltdb.LeaseType
 
 	default:
 		// We shouldn't be hitting this, but will err on the side of caution and
@@ -459,7 +459,7 @@ func (c *LeaseCache) startRenewing(ctx context.Context, index *cachememdb.Index,
 			return
 		}
 		c.logger.Debug("evicting index from cache", "id", id, "method", req.Request.Method, "path", req.Request.URL.Path)
-		err := c.Evict(id)
+		err := c.Evict(index)
 		if err != nil {
 			c.logger.Error("failed to evict index", "id", id, "error", err)
 			return
@@ -556,7 +556,9 @@ func computeIndexID(req *SendRequest) (string, error) {
 
 	// Append req.Token into the byte slice. This is needed since auto-auth'ed
 	// requests sets the token directly into SendRequest.Token
-	b.Write([]byte(req.Token))
+	if _, err := b.Write([]byte(req.Token)); err != nil {
+		return "", fmt.Errorf("failed to write token to hash input: %w", err)
+	}
 
 	return hex.EncodeToString(cryptoutil.Blake2b256Hash(string(b.Bytes()))), nil
 }
@@ -921,12 +923,12 @@ func (c *LeaseCache) Set(ctx context.Context, index *cachememdb.Index) error {
 	}
 
 	if c.ps != nil {
-		b, err := index.Serialize()
+		plaintext, err := index.Serialize()
 		if err != nil {
 			return err
 		}
 
-		if err := c.ps.Set(ctx, index.ID, b, index.Type); err != nil {
+		if err := c.ps.Set(ctx, index.ID, plaintext, index.Type); err != nil {
 			return err
 		}
 		c.logger.Trace("set entry in persistent storage", "type", index.Type, "path", index.RequestPath, "id", index.ID)
@@ -937,16 +939,16 @@ func (c *LeaseCache) Set(ctx context.Context, index *cachememdb.Index) error {
 
 // Evict removes an Index from the cachememdb, and also removes it from the
 // persistent cache (if enabled)
-func (c *LeaseCache) Evict(id string) error {
-	if err := c.db.Evict(cachememdb.IndexNameID, id); err != nil {
+func (c *LeaseCache) Evict(index *cachememdb.Index) error {
+	if err := c.db.Evict(cachememdb.IndexNameID, index.ID); err != nil {
 		return err
 	}
 
 	if c.ps != nil {
-		if err := c.ps.Delete(id); err != nil {
+		if err := c.ps.Delete(index.ID, index.Type); err != nil {
 			return err
 		}
-		c.logger.Trace("deleted item from persistent storage", "id", id)
+		c.logger.Trace("deleted item from persistent storage", "id", index.ID)
 	}
 
 	return nil
@@ -970,39 +972,54 @@ func (c *LeaseCache) Flush() error {
 // tokens first, since restoring a lease's renewal context and watcher requires
 // looking up the token in the cachememdb.
 func (c *LeaseCache) Restore(ctx context.Context, storage *cacheboltdb.BoltStorage) error {
-	var errors *multierror.Error
+	var errs *multierror.Error
 
 	// Process tokens first
 	tokens, err := storage.GetByType(ctx, cacheboltdb.TokenType)
 	if err != nil {
-		errors = multierror.Append(errors, err)
+		errs = multierror.Append(errs, err)
 	} else {
 		if err := c.restoreTokens(tokens); err != nil {
-			errors = multierror.Append(errors, err)
+			errs = multierror.Append(errs, err)
 		}
 	}
 
-	// Then process auth leases
-	authLeases, err := storage.GetByType(ctx, cacheboltdb.AuthLeaseType)
+	// Then process leases
+	leases, err := storage.GetByType(ctx, cacheboltdb.LeaseType)
 	if err != nil {
-		errors = multierror.Append(errors, err)
+		errs = multierror.Append(errs, err)
 	} else {
-		if err := c.restoreLeases(authLeases); err != nil {
-			errors = multierror.Append(errors, err)
-		}
-	}
-
-	// Then process secret leases
-	secretLeases, err := storage.GetByType(ctx, cacheboltdb.SecretLeaseType)
+		for _, lease := range leases {
+			newIndex, err := cachememdb.Deserialize(lease)
 			if err != nil {
-		errors = multierror.Append(errors, err)
-	} else {
-		if err := c.restoreLeases(secretLeases); err != nil {
-			errors = multierror.Append(errors, err)
+				errs = multierror.Append(errs, err)
+				continue
+			}
+
+			c.logger.Trace("restoring lease", "id", newIndex.ID, "path", newIndex.RequestPath)
+
+			// Check if this lease has already expired
+			expired, err := c.hasExpired(time.Now().UTC(), newIndex)
+			if err != nil {
+				c.logger.Warn("failed to check if lease is expired", "id", newIndex.ID, "error", err)
+			}
+			if expired {
+				continue
+			}
+
+			if err := c.restoreLeaseRenewCtx(newIndex); err != nil {
+				errs = multierror.Append(errs, err)
+				continue
+			}
+			if err := c.db.Set(newIndex); err != nil {
+				errs = multierror.Append(errs, err)
+				continue
+			}
+			c.logger.Trace("restored lease", "id", newIndex.ID, "path", newIndex.RequestPath)
 		}
 	}
 
-	return errors.ErrorOrNil()
+	return errs.ErrorOrNil()
 }
 
 func (c *LeaseCache) restoreTokens(tokens [][]byte) error {
@@ -1025,39 +1042,6 @@ func (c *LeaseCache) restoreTokens(tokens [][]byte) error {
 	return errors.ErrorOrNil()
 }
 
-func (c *LeaseCache) restoreLeases(leases [][]byte) error {
-	var errors *multierror.Error
-
-	for _, lease := range leases {
-		newIndex, err := cachememdb.Deserialize(lease)
-		if err != nil {
-			errors = multierror.Append(errors, err)
-			continue
-		}
-
-		// Check if this lease has already expired
-		expired, err := c.hasExpired(time.Now().UTC(), newIndex)
-		if err != nil {
-			c.logger.Warn("failed to check if lease is expired", "id", newIndex.ID, "error", err)
-		}
-		if expired {
-			continue
-		}
-
-		if err := c.restoreLeaseRenewCtx(newIndex); err != nil {
-			errors = multierror.Append(errors, err)
-			continue
-		}
-		if err := c.db.Set(newIndex); err != nil {
-			errors = multierror.Append(errors, err)
-			continue
-		}
-		c.logger.Trace("restored lease", "id", newIndex.ID, "path", newIndex.RequestPath)
-	}
-
-	return errors.ErrorOrNil()
-}
-
 // restoreLeaseRenewCtx re-creates a RenewCtx for an index object and starts
 // the watcher go routine
 func (c *LeaseCache) restoreLeaseRenewCtx(index *cachememdb.Index) error {
@@ -1300,13 +1284,13 @@ func (c *LeaseCache) hasExpired(currentTime time.Time, index *cachememdb.Index)
 
 	elapsed := currentTime.Sub(index.LastRenewed)
 	var leaseDuration int
-	switch index.Type {
-	case cacheboltdb.AuthLeaseType:
-		leaseDuration = secret.Auth.LeaseDuration
-	case cacheboltdb.SecretLeaseType:
+	switch {
+	case secret.LeaseID != "":
 		leaseDuration = secret.LeaseDuration
+	case secret.Auth != nil:
+		leaseDuration = secret.Auth.LeaseDuration
 	default:
-		return false, fmt.Errorf("index type %q unexpected in expiration check", index.Type)
+		return false, errors.New("secret without lease encountered in expiration check")
 	}
 
 	if int(elapsed.Seconds()) > leaseDuration {

command/agent/cache/lease_cache_test.go

@@ -36,7 +36,6 @@ func testNewLeaseCache(t *testing.T, responses []*SendResponse) *LeaseCache {
 	if err != nil {
 		t.Fatal(err)
 	}
-
 	lc, err := NewLeaseCache(&LeaseCacheConfig{
 		Client:      client,
 		BaseContext: context.Background(),
@@ -46,7 +45,6 @@ func testNewLeaseCache(t *testing.T, responses []*SendResponse) *LeaseCache {
 	if err != nil {
 		t.Fatal(err)
 	}
-
 	return lc
 }
 
@@ -175,7 +173,7 @@ func TestLeaseCache_SendCacheable(t *testing.T) {
 
 	lc := testNewLeaseCache(t, responses)
 	// Register an token so that the token and lease requests are cached
-	lc.RegisterAutoAuthToken("autoauthtoken")
+	require.NoError(t, lc.RegisterAutoAuthToken("autoauthtoken"))
 
 	// Make a request. A response with a new token is returned to the lease
 	// cache and that will be cached.
@@ -600,6 +598,7 @@ func TestLeaseCache_Concurrent_NonCacheable(t *testing.T) {
 	defer cancel()
 
 	wgDoneCh := make(chan struct{})
+	errCh := make(chan error)
 
 	go func() {
 		var wg sync.WaitGroup
@@ -618,7 +617,7 @@ func TestLeaseCache_Concurrent_NonCacheable(t *testing.T) {
 
 				_, err := lc.Send(ctx, sendReq)
 				if err != nil {
-					t.Fatal(err)
+					errCh <- err
 				}
 			}()
 		}
@@ -631,6 +630,8 @@ func TestLeaseCache_Concurrent_NonCacheable(t *testing.T) {
 	case <-ctx.Done():
 		t.Fatalf("request timed out: %s", ctx.Err())
 	case <-wgDoneCh:
+	case err := <-errCh:
+		t.Fatal(err)
 	}
 }
 
@@ -649,6 +650,7 @@ func TestLeaseCache_Concurrent_Cacheable(t *testing.T) {
 
 	var cacheCount atomic.Uint32
 	wgDoneCh := make(chan struct{})
+	errCh := make(chan error)
 
 	go func() {
 		var wg sync.WaitGroup
@@ -666,7 +668,7 @@ func TestLeaseCache_Concurrent_Cacheable(t *testing.T) {
 
 				resp, err := lc.Send(ctx, sendReq)
 				if err != nil {
-					t.Fatal(err)
+					errCh <- err
 				}
 
 				if resp.CacheMeta != nil && resp.CacheMeta.Hit {
@@ -683,6 +685,8 @@ func TestLeaseCache_Concurrent_Cacheable(t *testing.T) {
 	case <-ctx.Done():
 		t.Fatalf("request timed out: %s", ctx.Err())
 	case <-wgDoneCh:
+	case err := <-errCh:
+		t.Fatal(err)
 	}
 
 	// Ensure that all but one request got proxied. The other 99 should be
@@ -711,6 +715,45 @@ func setupBoltStorage(t *testing.T) (tempCacheDir string, boltStorage *cachebolt
 	return tempCacheDir, boltStorage
 }
 
+func compareBeforeAndAfter(t *testing.T, before, after *LeaseCache, beforeLen, afterLen int) {
+	beforeDB, err := before.db.GetByPrefix(cachememdb.IndexNameID)
+	require.NoError(t, err)
+	assert.Len(t, beforeDB, beforeLen)
+	afterDB, err := after.db.GetByPrefix(cachememdb.IndexNameID)
+	require.NoError(t, err)
+	assert.Len(t, afterDB, afterLen)
+	for _, cachedItem := range beforeDB {
+		if strings.Contains(cachedItem.RequestPath, "expect-missing") {
+			continue
+		}
+		restoredItem, err := after.db.Get(cachememdb.IndexNameID, cachedItem.ID)
+		require.NoError(t, err)
+
+		assert.NoError(t, err)
+		assert.Equal(t, cachedItem.ID, restoredItem.ID)
+		assert.Equal(t, cachedItem.Lease, restoredItem.Lease)
+		assert.Equal(t, cachedItem.LeaseToken, restoredItem.LeaseToken)
+		assert.Equal(t, cachedItem.Namespace, restoredItem.Namespace)
+		assert.Equal(t, cachedItem.RequestHeader, restoredItem.RequestHeader)
+		assert.Equal(t, cachedItem.RequestMethod, restoredItem.RequestMethod)
+		assert.Equal(t, cachedItem.RequestPath, restoredItem.RequestPath)
+		assert.Equal(t, cachedItem.RequestToken, restoredItem.RequestToken)
+		assert.Equal(t, cachedItem.Response, restoredItem.Response)
+		assert.Equal(t, cachedItem.Token, restoredItem.Token)
+		assert.Equal(t, cachedItem.TokenAccessor, restoredItem.TokenAccessor)
+		assert.Equal(t, cachedItem.TokenParent, restoredItem.TokenParent)
+
+		// check what we can in the renewal context
+		assert.NotEmpty(t, restoredItem.RenewCtxInfo.CancelFunc)
+		assert.NotZero(t, restoredItem.RenewCtxInfo.DoneCh)
+		require.NotEmpty(t, restoredItem.RenewCtxInfo.Ctx)
+		assert.Equal(t,
+			cachedItem.RenewCtxInfo.Ctx.Value(contextIndexID),
+			restoredItem.RenewCtxInfo.Ctx.Value(contextIndexID),
+		)
+	}
+}
+
 func TestLeaseCache_PersistAndRestore(t *testing.T) {
 	// Emulate responses from the api proxy. The first two use the auto-auth
 	// token, and the others use another token.
@@ -827,7 +870,7 @@ func TestLeaseCache_PersistAndRestore(t *testing.T) {
 
 	require.NotEmpty(t, deleteIDs)
 	for _, deleteID := range deleteIDs {
-		err = boltStorage.Delete(deleteID)
+		err = boltStorage.Delete(deleteID, cacheboltdb.LeaseType)
 		require.NoError(t, err)
 	}
 
@@ -842,43 +885,8 @@ func TestLeaseCache_PersistAndRestore(t *testing.T) {
 	assert.Len(t, errors.Errors, 1)
 	assert.Contains(t, errors.Error(), "could not find parent Token testtoken2")
 
-	// Now compare before and after
-	beforeDB, err := lc.db.GetByPrefix(cachememdb.IndexNameID)
-	require.NoError(t, err)
-	assert.Len(t, beforeDB, 7)
-	for _, cachedItem := range beforeDB {
-		if strings.Contains(cachedItem.RequestPath, "expect-missing") {
-			continue
-		}
-		restoredItem, err := restoredCache.db.Get(cachememdb.IndexNameID, cachedItem.ID)
-		require.NoError(t, err)
-
-		assert.NoError(t, err)
-		assert.Equal(t, cachedItem.ID, restoredItem.ID)
-		assert.Equal(t, cachedItem.Lease, restoredItem.Lease)
-		assert.Equal(t, cachedItem.LeaseToken, restoredItem.LeaseToken)
-		assert.Equal(t, cachedItem.Namespace, restoredItem.Namespace)
-		assert.Equal(t, cachedItem.RequestHeader, restoredItem.RequestHeader)
-		assert.Equal(t, cachedItem.RequestMethod, restoredItem.RequestMethod)
-		assert.Equal(t, cachedItem.RequestPath, restoredItem.RequestPath)
-		assert.Equal(t, cachedItem.RequestToken, restoredItem.RequestToken)
-		assert.Equal(t, cachedItem.Response, restoredItem.Response)
-		assert.Equal(t, cachedItem.Token, restoredItem.Token)
-		assert.Equal(t, cachedItem.TokenAccessor, restoredItem.TokenAccessor)
-		assert.Equal(t, cachedItem.TokenParent, restoredItem.TokenParent)
-
-		// check what we can in the renewal context
-		assert.NotEmpty(t, restoredItem.RenewCtxInfo.CancelFunc)
-		assert.NotZero(t, restoredItem.RenewCtxInfo.DoneCh)
-		require.NotEmpty(t, restoredItem.RenewCtxInfo.Ctx)
-		assert.Equal(t,
-			cachedItem.RenewCtxInfo.Ctx.Value(contextIndexID),
-			restoredItem.RenewCtxInfo.Ctx.Value(contextIndexID),
-		)
-	}
-	afterDB, err := restoredCache.db.GetByPrefix(cachememdb.IndexNameID)
-	require.NoError(t, err)
-	assert.Len(t, afterDB, 5)
+	// Now compare the cache contents before and after
+	compareBeforeAndAfter(t, lc, restoredCache, 7, 5)
 
 	// And finally send the cache requests once to make sure they're all being
 	// served from the restoredCache unless they were intended to be missing after restore.
@@ -899,6 +907,88 @@ func TestLeaseCache_PersistAndRestore(t *testing.T) {
 	}
 }
 
+func TestLeaseCache_PersistAndRestore_WithManyDependencies(t *testing.T) {
+	tempDir, boltStorage := setupBoltStorage(t)
+	defer os.RemoveAll(tempDir)
+	defer boltStorage.Close()
+
+	var requests []*SendRequest
+	var responses []*SendResponse
+	var orderedRequestPaths []string
+
+	// helper func to generate new auth leases with a child secret lease attached
+	authAndSecretLease := func(id int, parentToken, newToken string) {
+		t.Helper()
+		path := fmt.Sprintf("/v1/auth/approle-%d/login", id)
+		orderedRequestPaths = append(orderedRequestPaths, path)
+		requests = append(requests, &SendRequest{
+			Token:   parentToken,
+			Request: httptest.NewRequest("PUT", "http://example.com"+path, strings.NewReader("")),
+		})
+		responses = append(responses, newTestSendResponse(200, fmt.Sprintf(`{"auth": {"client_token": "%s", "renewable": true, "lease_duration": 600}}`, newToken)))
+
+		// Fetch a leased secret using the new token
+		path = fmt.Sprintf("/v1/kv/%d", id)
+		orderedRequestPaths = append(orderedRequestPaths, path)
+		requests = append(requests, &SendRequest{
+			Token:   newToken,
+			Request: httptest.NewRequest("GET", "http://example.com"+path, strings.NewReader("")),
+		})
+		responses = append(responses, newTestSendResponse(200, fmt.Sprintf(`{"lease_id": "secret-%d-lease", "renewable": true, "data": {"number": %d}, "lease_duration": 600}`, id, id)))
+	}
+
+	// Pathological case: a long chain of child tokens
+	authAndSecretLease(0, "autoauthtoken", "many-ancestors-token;0")
+	for i := 1; i <= 50; i++ {
+		// Create a new generation of child token
+		authAndSecretLease(i, fmt.Sprintf("many-ancestors-token;%d", i-1), fmt.Sprintf("many-ancestors-token;%d", i))
+	}
+
+	// Lots of sibling tokens with auto auth token as their parent
+	for i := 51; i <= 100; i++ {
+		authAndSecretLease(i, "autoauthtoken", fmt.Sprintf("many-siblings-token;%d", i))
+	}
+
+	// Also create some extra siblings for an auth token further down the chain
+	for i := 101; i <= 110; i++ {
+		authAndSecretLease(i, "many-ancestors-token;25", fmt.Sprintf("many-siblings-for-ancestor-token;%d", i))
+	}
+
+	lc := testNewLeaseCacheWithPersistence(t, responses, boltStorage)
+
+	// Register an auto-auth token so that the token and lease requests are cached
+	err := lc.RegisterAutoAuthToken("autoauthtoken")
+	require.NoError(t, err)
+
+	for _, req := range requests {
+		// Send once to cache
+		resp, err := lc.Send(context.Background(), req)
+		require.NoError(t, err)
+		assert.Equal(t, 200, resp.Response.StatusCode, "expected success")
+		assert.Nil(t, resp.CacheMeta)
+	}
+
+	// Ensure leases are retrieved in the correct order
+	var processed int
+
+	leases, err := boltStorage.GetByType(context.Background(), cacheboltdb.LeaseType)
+	for _, lease := range leases {
+		index, err := cachememdb.Deserialize(lease)
+		require.NoError(t, err)
+		require.Equal(t, orderedRequestPaths[processed], index.RequestPath)
+		processed++
+	}
+
+	assert.Equal(t, len(orderedRequestPaths), processed)
+
+	restoredCache := testNewLeaseCache(t, nil)
+	err = restoredCache.Restore(context.Background(), boltStorage)
+	require.NoError(t, err)
+
+	// Now compare the cache contents before and after
+	compareBeforeAndAfter(t, lc, restoredCache, 223, 223)
+}
+
 func TestEvictPersistent(t *testing.T) {
 	ctx := context.Background()
 
@@ -911,7 +1001,7 @@ func TestEvictPersistent(t *testing.T) {
 	defer boltStorage.Close()
 	lc := testNewLeaseCacheWithPersistence(t, responses, boltStorage)
 
-	lc.RegisterAutoAuthToken("autoauthtoken")
+	require.NoError(t, lc.RegisterAutoAuthToken("autoauthtoken"))
 
 	// populate cache by sending request through
 	sendReq := &SendRequest{
@@ -924,7 +1014,7 @@ func TestEvictPersistent(t *testing.T) {
 	assert.Nil(t, resp.CacheMeta)
 
 	// Check bolt for the cached lease
-	secrets, err := lc.ps.GetByType(ctx, cacheboltdb.SecretLeaseType)
+	secrets, err := lc.ps.GetByType(ctx, cacheboltdb.LeaseType)
 	require.NoError(t, err)
 	assert.Len(t, secrets, 1)
 
@@ -938,7 +1028,7 @@ func TestEvictPersistent(t *testing.T) {
 	time.Sleep(2 * time.Second)
 
 	// Check that cached item is gone
-	secrets, err = lc.ps.GetByType(ctx, cacheboltdb.SecretLeaseType)
+	secrets, err = lc.ps.GetByType(ctx, cacheboltdb.LeaseType)
 	require.NoError(t, err)
 	assert.Len(t, secrets, 0)
 }
@@ -978,7 +1068,7 @@ func Test_hasExpired(t *testing.T) {
 		newTestSendResponse(201, `{"lease_id": "foo", "renewable": true, "data": {"value": "foo"}, "lease_duration": 60}`),
 	}
 	lc := testNewLeaseCache(t, responses)
-	lc.RegisterAutoAuthToken("autoauthtoken")
+	require.NoError(t, lc.RegisterAutoAuthToken("autoauthtoken"))
 
 	cacheTests := []struct {
 		token          string
@@ -990,14 +1080,14 @@ func Test_hasExpired(t *testing.T) {
 			// auth lease
 			token:          "autoauthtoken",
 			urlPath:        "/v1/sample/auth",
-			leaseType:      cacheboltdb.AuthLeaseType,
+			leaseType:      cacheboltdb.LeaseType,
 			wantStatusCode: responses[0].Response.StatusCode,
 		},
 		{
 			// secret lease
 			token:          "autoauthtoken",
 			urlPath:        "/v1/sample/secret",
-			leaseType:      cacheboltdb.SecretLeaseType,
+			leaseType:      cacheboltdb.LeaseType,
 			wantStatusCode: responses[1].Response.StatusCode,
 		},
 	}
@@ -1039,13 +1129,13 @@ func TestLeaseCache_hasExpired_wrong_type(t *testing.T) {
 Content-Type: application/json
 Date: Tue, 02 Mar 2021 17:54:16 GMT
 
-{"auth": {"client_token": "testtoken", "renewable": true, "lease_duration": 60}}`),
+{}`),
 	}
 
 	lc := testNewLeaseCache(t, nil)
 	expired, err := lc.hasExpired(time.Now().UTC(), index)
 	assert.False(t, expired)
-	assert.EqualError(t, err, `index type "token" unexpected in expiration check`)
+	assert.EqualError(t, err, `secret without lease encountered in expiration check`)
 }
 
 func TestLeaseCacheRestore_expired(t *testing.T) {
@@ -1061,7 +1151,7 @@ func TestLeaseCacheRestore_expired(t *testing.T) {
 	lc := testNewLeaseCacheWithPersistence(t, responses, boltStorage)
 
 	// Register an auto-auth token so that the token and lease requests are cached in mem
-	lc.RegisterAutoAuthToken("autoauthtoken")
+	require.NoError(t, lc.RegisterAutoAuthToken("autoauthtoken"))
 
 	cacheTests := []struct {
 		token          string