forked from hashicorp/vault
/
identity_store.go
400 lines (332 loc) · 11.3 KB
/
identity_store.go
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package vault
import (
"context"
"fmt"
"strings"
"github.com/golang/protobuf/ptypes"
"github.com/hashicorp/errwrap"
log "github.com/hashicorp/go-hclog"
memdb "github.com/hashicorp/go-memdb"
"github.com/hashicorp/vault/helper/identity"
"github.com/hashicorp/vault/helper/storagepacker"
"github.com/hashicorp/vault/logical"
"github.com/hashicorp/vault/logical/framework"
)
const (
groupBucketsPrefix = "packer/group/buckets/"
)
func (c *Core) IdentityStore() *IdentityStore {
return c.identityStore
}
// NewIdentityStore creates a new identity store
func NewIdentityStore(ctx context.Context, core *Core, config *logical.BackendConfig, logger log.Logger) (*IdentityStore, error) {
var err error
// Create a new in-memory database for the identity store
db, err := memdb.NewMemDB(identityStoreSchema())
if err != nil {
return nil, errwrap.Wrapf("failed to create memdb for identity store: {{err}}", err)
}
iStore := &IdentityStore{
view: config.StorageView,
db: db,
logger: logger,
core: core,
}
iStore.entityPacker, err = storagepacker.NewStoragePacker(iStore.view, iStore.logger, "")
if err != nil {
return nil, errwrap.Wrapf("failed to create entity packer: {{err}}", err)
}
iStore.groupPacker, err = storagepacker.NewStoragePacker(iStore.view, iStore.logger, groupBucketsPrefix)
if err != nil {
return nil, errwrap.Wrapf("failed to create group packer: {{err}}", err)
}
iStore.Backend = &framework.Backend{
BackendType: logical.TypeLogical,
Paths: framework.PathAppend(
entityPaths(iStore),
aliasPaths(iStore),
groupAliasPaths(iStore),
groupPaths(iStore),
lookupPaths(iStore),
upgradePaths(iStore),
),
Invalidate: iStore.Invalidate,
}
err = iStore.Setup(ctx, config)
if err != nil {
return nil, err
}
return iStore, nil
}
// Invalidate is a callback wherein the backend is informed that the value at
// the given key is updated. In identity store's case, it would be the entity
// storage entries that get updated. The value needs to be read and MemDB needs
// to be updated accordingly.
func (i *IdentityStore) Invalidate(ctx context.Context, key string) {
i.logger.Debug("invalidate notification received", "key", key)
switch {
// Check if the key is a storage entry key for an entity bucket
case strings.HasPrefix(key, storagepacker.StoragePackerBucketsPrefix):
// Get the hash value of the storage bucket entry key
bucketKeyHash := i.entityPacker.BucketKeyHashByKey(key)
if len(bucketKeyHash) == 0 {
i.logger.Error("failed to get the bucket entry key hash")
return
}
// Create a MemDB transaction
txn := i.db.Txn(true)
defer txn.Abort()
// Each entity object in MemDB holds the MD5 hash of the storage
// entry key of the entity bucket. Fetch all the entities that
// belong to this bucket using the hash value. Remove these entities
// from MemDB along with all the aliases of each entity.
entitiesFetched, err := i.MemDBEntitiesByBucketEntryKeyHashInTxn(txn, string(bucketKeyHash))
if err != nil {
i.logger.Error("failed to fetch entities using the bucket entry key hash", "bucket_entry_key_hash", bucketKeyHash)
return
}
for _, entity := range entitiesFetched {
// Delete all the aliases in the entity. This function will also remove
// the corresponding alias indexes too.
err = i.deleteAliasesInEntityInTxn(txn, entity, entity.Aliases)
if err != nil {
i.logger.Error("failed to delete aliases in entity", "entity_id", entity.ID, "error", err)
return
}
// Delete the entity using the same transaction
err = i.MemDBDeleteEntityByIDInTxn(txn, entity.ID)
if err != nil {
i.logger.Error("failed to delete entity from MemDB", "entity_id", entity.ID, "error", err)
return
}
}
// Get the storage bucket entry
bucket, err := i.entityPacker.GetBucket(key)
if err != nil {
i.logger.Error("failed to refresh entities", "key", key, "error", err)
return
}
// If the underlying entry is nil, it means that this invalidation
// notification is for the deletion of the underlying storage entry. At
// this point, since all the entities belonging to this bucket are
// already removed, there is nothing else to be done. But, if the
// storage entry is non-nil, its an indication of an update. In this
// case, entities in the updated bucket needs to be reinserted into
// MemDB.
if bucket != nil {
for _, item := range bucket.Items {
entity, err := i.parseEntityFromBucketItem(ctx, item)
if err != nil {
i.logger.Error("failed to parse entity from bucket entry item", "error", err)
return
}
// Only update MemDB and don't touch the storage
err = i.upsertEntityInTxn(txn, entity, nil, false)
if err != nil {
i.logger.Error("failed to update entity in MemDB", "error", err)
return
}
}
}
txn.Commit()
return
// Check if the key is a storage entry key for an group bucket
case strings.HasPrefix(key, groupBucketsPrefix):
// Get the hash value of the storage bucket entry key
bucketKeyHash := i.groupPacker.BucketKeyHashByKey(key)
if len(bucketKeyHash) == 0 {
i.logger.Error("failed to get the bucket entry key hash")
return
}
// Create a MemDB transaction
txn := i.db.Txn(true)
defer txn.Abort()
groupsFetched, err := i.MemDBGroupsByBucketEntryKeyHashInTxn(txn, string(bucketKeyHash))
if err != nil {
i.logger.Error("failed to fetch groups using the bucket entry key hash", "bucket_entry_key_hash", bucketKeyHash)
return
}
for _, group := range groupsFetched {
// Delete the group using the same transaction
err = i.MemDBDeleteGroupByIDInTxn(txn, group.ID)
if err != nil {
i.logger.Error("failed to delete group from MemDB", "group_id", group.ID, "error", err)
return
}
}
// Get the storage bucket entry
bucket, err := i.groupPacker.GetBucket(key)
if err != nil {
i.logger.Error("failed to refresh group", "key", key, "error", err)
return
}
if bucket != nil {
for _, item := range bucket.Items {
group, err := i.parseGroupFromBucketItem(item)
if err != nil {
i.logger.Error("failed to parse group from bucket entry item", "error", err)
return
}
// Before updating the group, check if the group exists. If it
// does, then delete the group alias from memdb, for the
// invalidation would have sent an update.
groupFetched, err := i.MemDBGroupByIDInTxn(txn, group.ID, true)
if err != nil {
i.logger.Error("failed to fetch group from MemDB", "error", err)
return
}
// If the group has an alias remove it from memdb
if groupFetched != nil && groupFetched.Alias != nil {
err := i.MemDBDeleteAliasByIDInTxn(txn, groupFetched.Alias.ID, true)
if err != nil {
i.logger.Error("failed to delete old group alias from MemDB", "error", err)
return
}
}
// Update MemDB with new group alias information
if group.Alias != nil {
err = i.MemDBUpsertAliasInTxn(txn, group.Alias, true)
if err != nil {
i.logger.Error("failed to update group alias in MemDB", "error", err)
return
}
}
// Only update MemDB and don't touch the storage
err = i.UpsertGroupInTxn(txn, group, false)
if err != nil {
i.logger.Error("failed to update group in MemDB", "error", err)
return
}
}
}
txn.Commit()
return
}
}
func (i *IdentityStore) parseEntityFromBucketItem(ctx context.Context, item *storagepacker.Item) (*identity.Entity, error) {
if item == nil {
return nil, fmt.Errorf("nil item")
}
var entity identity.Entity
err := ptypes.UnmarshalAny(item.Message, &entity)
if err != nil {
return nil, errwrap.Wrapf("failed to decode entity from storage bucket item: {{err}}", err)
}
return &entity, nil
}
func (i *IdentityStore) parseGroupFromBucketItem(item *storagepacker.Item) (*identity.Group, error) {
if item == nil {
return nil, fmt.Errorf("nil item")
}
var group identity.Group
err := ptypes.UnmarshalAny(item.Message, &group)
if err != nil {
return nil, errwrap.Wrapf("failed to decode group from storage bucket item: {{err}}", err)
}
return &group, nil
}
// entityByAliasFactors fetches the entity based on factors of alias, i.e mount
// accessor and the alias name.
func (i *IdentityStore) entityByAliasFactors(mountAccessor, aliasName string, clone bool) (*identity.Entity, error) {
if mountAccessor == "" {
return nil, fmt.Errorf("missing mount accessor")
}
if aliasName == "" {
return nil, fmt.Errorf("missing alias name")
}
txn := i.db.Txn(false)
return i.entityByAliasFactorsInTxn(txn, mountAccessor, aliasName, clone)
}
// entityByAlaisFactorsInTxn fetches the entity based on factors of alias, i.e
// mount accessor and the alias name.
func (i *IdentityStore) entityByAliasFactorsInTxn(txn *memdb.Txn, mountAccessor, aliasName string, clone bool) (*identity.Entity, error) {
if txn == nil {
return nil, fmt.Errorf("nil txn")
}
if mountAccessor == "" {
return nil, fmt.Errorf("missing mount accessor")
}
if aliasName == "" {
return nil, fmt.Errorf("missing alias name")
}
alias, err := i.MemDBAliasByFactorsInTxn(txn, mountAccessor, aliasName, false, false)
if err != nil {
return nil, err
}
if alias == nil {
return nil, nil
}
return i.MemDBEntityByAliasIDInTxn(txn, alias.ID, clone)
}
// CreateOrFetchEntity creates a new entity. This is used by core to
// associate each login attempt by an alias to a unified entity in Vault.
func (i *IdentityStore) CreateOrFetchEntity(alias *logical.Alias) (*identity.Entity, error) {
var entity *identity.Entity
var err error
if alias == nil {
return nil, fmt.Errorf("alias is nil")
}
if alias.Name == "" {
return nil, fmt.Errorf("empty alias name")
}
mountValidationResp := i.core.router.validateMountByAccessor(alias.MountAccessor)
if mountValidationResp == nil {
return nil, fmt.Errorf("invalid mount accessor %q", alias.MountAccessor)
}
if mountValidationResp.MountLocal {
return nil, fmt.Errorf("mount_accessor %q is of a local mount", alias.MountAccessor)
}
if mountValidationResp.MountType != alias.MountType {
return nil, fmt.Errorf("mount accessor %q is not a mount of type %q", alias.MountAccessor, alias.MountType)
}
// Check if an entity already exists for the given alais
entity, err = i.entityByAliasFactors(alias.MountAccessor, alias.Name, false)
if err != nil {
return nil, err
}
if entity != nil {
return entity, nil
}
i.lock.Lock()
defer i.lock.Unlock()
// Create a MemDB transaction to update both alias and entity
txn := i.db.Txn(true)
defer txn.Abort()
// Check if an entity was created before acquiring the lock
entity, err = i.entityByAliasFactorsInTxn(txn, alias.MountAccessor, alias.Name, false)
if err != nil {
return nil, err
}
if entity != nil {
return entity, nil
}
i.logger.Debug("creating a new entity", "alias", alias)
entity = &identity.Entity{}
err = i.sanitizeEntity(entity)
if err != nil {
return nil, err
}
// Create a new alias
newAlias := &identity.Alias{
CanonicalID: entity.ID,
Name: alias.Name,
MountAccessor: alias.MountAccessor,
MountPath: mountValidationResp.MountPath,
MountType: mountValidationResp.MountType,
}
err = i.sanitizeAlias(newAlias)
if err != nil {
return nil, err
}
// Append the new alias to the new entity
entity.Aliases = []*identity.Alias{
newAlias,
}
// Update MemDB and persist entity object
err = i.upsertEntityInTxn(txn, entity, nil, true)
if err != nil {
return nil, err
}
txn.Commit()
return entity, nil
}