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team_ek_box_storage.go
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team_ek_box_storage.go
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package ephemeral
import (
"fmt"
"log"
"sync"
lru "github.com/hashicorp/golang-lru"
"github.com/keybase/client/go/libkb"
"github.com/keybase/client/go/protocol/gregor1"
"github.com/keybase/client/go/protocol/keybase1"
)
const teamEKBoxStorageDBVersion = 5
type teamEKBoxCacheItem struct {
TeamEKBoxed keybase1.TeamEphemeralKeyBoxed
Err *EphemeralKeyError
}
func newTeamEKBoxCacheItem(teamEKBoxed keybase1.TeamEphemeralKeyBoxed, err error) teamEKBoxCacheItem {
var ekErr *EphemeralKeyError
e, ok := err.(EphemeralKeyError)
if !ok && err != nil {
e = newEphemeralKeyError(err.Error(), DefaultHumanErrMsg,
EphemeralKeyErrorKindUNKNOWN, TeamEKKind)
}
if err != nil {
ekErr = &e
}
return teamEKBoxCacheItem{
TeamEKBoxed: teamEKBoxed,
Err: ekErr,
}
}
func (c teamEKBoxCacheItem) HasError() bool {
return c.Err != nil
}
func (c teamEKBoxCacheItem) Error() error {
if c.HasError() {
return *c.Err
}
return nil
}
type teamEKBoxCache map[keybase1.EkGeneration]teamEKBoxCacheItem
type TeamEKBoxMap map[keybase1.EkGeneration]keybase1.TeamEphemeralKeyBoxed
type TeamEKMap map[keybase1.EkGeneration]keybase1.TeamEphemeralKey
func teamKey(mctx libkb.MetaContext, teamID keybase1.TeamID) string {
return fmt.Sprintf("%s-%s", teamID, mctx.G().Env.GetUsername())
}
// We cache TeamEKBoxes from the server in a LRU and a persist to a local
// KVStore.
type TeamEKBoxStorage struct {
sync.RWMutex
locktab *libkb.LockTable
cache *teamEKCache
keyer EphemeralKeyer
}
func NewTeamEKBoxStorage(keyer EphemeralKeyer) *TeamEKBoxStorage {
return &TeamEKBoxStorage{
cache: newTeamEKCache(),
keyer: keyer,
locktab: libkb.NewLockTable(),
}
}
func (s *TeamEKBoxStorage) lockForTeamID(mctx libkb.MetaContext, teamID keybase1.TeamID) func() {
s.RLock()
lock := s.locktab.AcquireOnName(mctx.Ctx(), mctx.G(), teamID.String())
return func() {
s.RUnlock()
lock.Release(mctx.Ctx())
}
}
func (s *TeamEKBoxStorage) dbKey(mctx libkb.MetaContext, teamID keybase1.TeamID) (dbKey libkb.DbKey, err error) {
uv, err := mctx.G().GetMeUV(mctx.Ctx())
if err != nil {
return dbKey, err
}
key := fmt.Sprintf("teamEphemeralKeyBox-%s-%s-%s-%d", s.keyer.Type(),
teamKey(mctx, teamID), uv.EldestSeqno, teamEKBoxStorageDBVersion)
return libkb.DbKey{
Typ: libkb.DBTeamEKBox,
Key: key,
}, nil
}
func (s *TeamEKBoxStorage) Get(mctx libkb.MetaContext, teamID keybase1.TeamID, generation keybase1.EkGeneration,
contentCtime *gregor1.Time) (teamEK keybase1.TeamEphemeralKey, err error) {
defer mctx.Trace(fmt.Sprintf("TeamEKBoxStorage#Get: teamID:%v, generation:%v", teamID, generation), &err)()
unlock := s.lockForTeamID(mctx, teamID)
cache, found, err := s.getCacheForTeamID(mctx, teamID)
if err != nil {
unlock()
return teamEK, err
} else if !found {
unlock() // release the lock while we fetch
return s.fetchAndStore(mctx, teamID, generation, contentCtime)
}
cacheItem, ok := cache[generation]
if !ok {
unlock() // release the lock while we fetch
return s.fetchAndStore(mctx, teamID, generation, contentCtime)
}
defer unlock() // release the lock after we unbox
if cacheItem.HasError() {
return teamEK, cacheItem.Error()
}
teamEK, err = s.keyer.Unbox(mctx, cacheItem.TeamEKBoxed, contentCtime)
switch err.(type) {
case EphemeralKeyError:
if perr := s.putLocked(mctx, teamID, generation, keybase1.TeamEphemeralKeyBoxed{}, err); perr != nil {
mctx.Debug("unable to store unboxing error %v", perr)
}
default:
// don't store
}
return teamEK, err
}
func (s *TeamEKBoxStorage) getCacheForTeamID(mctx libkb.MetaContext, teamID keybase1.TeamID) (cache teamEKBoxCache, found bool, err error) {
cache, found = s.cache.GetMap(mctx, teamID)
if found {
return cache, found, nil
}
key, err := s.dbKey(mctx, teamID)
if err != nil {
return nil, false, err
}
cache = make(teamEKBoxCache)
found, err = mctx.G().GetKVStore().GetInto(&cache, key)
if err != nil {
return nil, found, err
} else if found {
s.cache.PutMap(mctx, teamID, cache)
}
return cache, found, err
}
type TeamEKBoxedResponse struct {
Result *struct {
Box string `json:"box"`
UserEKGeneration keybase1.EkGeneration `json:"user_ek_generation"`
Sig string `json:"sig"`
} `json:"result"`
}
func (s *TeamEKBoxStorage) fetchAndStore(mctx libkb.MetaContext, teamID keybase1.TeamID, generation keybase1.EkGeneration,
contentCtime *gregor1.Time) (teamEK keybase1.TeamEphemeralKey, err error) {
defer mctx.Trace(fmt.Sprintf("TeamEKBoxStorage#fetchAndStore: teamID:%v, generation:%v", teamID, generation), &err)()
// cache unboxing/missing box errors so we don't continually try to fetch
// something nonexistent.
defer func() {
if _, ok := err.(EphemeralKeyError); ok {
unlock := s.lockForTeamID(mctx, teamID)
defer unlock()
if perr := s.putLocked(mctx, teamID, generation, keybase1.TeamEphemeralKeyBoxed{}, err); perr != nil {
mctx.Debug("unable to store error %v", perr)
}
}
}()
teamEKBoxed, err := s.keyer.Fetch(mctx, teamID, generation, contentCtime)
if err != nil {
return teamEK, err
}
teamEK, err = s.keyer.Unbox(mctx, teamEKBoxed, contentCtime)
if err != nil {
return teamEK, err
}
// Store the boxed version, return the unboxed
err = s.Put(mctx, teamID, generation, teamEKBoxed)
return teamEK, err
}
func (s *TeamEKBoxStorage) Put(mctx libkb.MetaContext, teamID keybase1.TeamID,
generation keybase1.EkGeneration, teamEKBoxed keybase1.TeamEphemeralKeyBoxed) (err error) {
unlock := s.lockForTeamID(mctx, teamID)
defer unlock()
return s.putLocked(mctx, teamID, generation, teamEKBoxed, nil /* ekErr */)
}
func (s *TeamEKBoxStorage) putLocked(mctx libkb.MetaContext, teamID keybase1.TeamID,
generation keybase1.EkGeneration, teamEKBoxed keybase1.TeamEphemeralKeyBoxed, ekErr error) (err error) {
defer mctx.Trace(fmt.Sprintf("TeamEKBoxStorage#putLocked: teamID:%v, generation:%v", teamID, generation), &err)()
// sanity check that we got the right generation
if teamEKBoxed.Generation() != generation && ekErr == nil {
return newEKCorruptedErr(mctx, TeamEKKind, generation, teamEKBoxed.Generation())
}
key, err := s.dbKey(mctx, teamID)
if err != nil {
return err
}
cache, _, err := s.getCacheForTeamID(mctx, teamID)
if err != nil {
return err
}
cache[generation] = newTeamEKBoxCacheItem(teamEKBoxed, ekErr)
if err = mctx.G().GetKVStore().PutObj(key, nil, cache); err != nil {
return err
}
s.cache.PutMap(mctx, teamID, cache)
return nil
}
func (s *TeamEKBoxStorage) Delete(mctx libkb.MetaContext, teamID keybase1.TeamID,
generation keybase1.EkGeneration) (err error) {
unlock := s.lockForTeamID(mctx, teamID)
defer unlock()
return s.deleteMany(mctx, teamID, []keybase1.EkGeneration{generation})
}
func (s *TeamEKBoxStorage) deleteMany(mctx libkb.MetaContext, teamID keybase1.TeamID,
generations []keybase1.EkGeneration) (err error) {
defer mctx.Trace(fmt.Sprintf("TeamEKBoxStorage#delete: teamID:%v, generations:%v", teamID, generations), &err)()
cache, found, err := s.getCacheForTeamID(mctx, teamID)
if err != nil {
return err
} else if !found {
return nil
}
for _, generation := range generations {
delete(cache, generation)
}
key, err := s.dbKey(mctx, teamID)
if err != nil {
return err
}
if err = mctx.G().GetKVStore().PutObj(key, nil, cache); err != nil {
return err
}
s.cache.PutMap(mctx, teamID, cache)
return nil
}
func (s *TeamEKBoxStorage) PurgeCacheForTeamID(mctx libkb.MetaContext, teamID keybase1.TeamID) (err error) {
defer mctx.Trace(fmt.Sprintf("TeamEKBoxStorage#PurgeCacheForTeamID: teamID:%v", teamID), &err)()
unlock := s.lockForTeamID(mctx, teamID)
defer unlock()
key, err := s.dbKey(mctx, teamID)
if err != nil {
return err
}
cache := make(teamEKBoxCache)
if err = mctx.G().GetKVStore().PutObj(key, nil, cache); err != nil {
return err
}
s.cache.PutMap(mctx, teamID, cache)
return nil
}
func (s *TeamEKBoxStorage) DeleteExpired(mctx libkb.MetaContext, teamID keybase1.TeamID,
merkleRoot libkb.MerkleRoot) (expired []keybase1.EkGeneration, err error) {
defer mctx.Trace(fmt.Sprintf("TeamEKBoxStorage#DeleteExpired: teamID:%v", teamID), &err)()
unlock := s.lockForTeamID(mctx, teamID)
defer unlock()
cache, found, err := s.getCacheForTeamID(mctx, teamID)
if err != nil {
return nil, err
} else if !found {
return nil, nil
}
merkleCtime := keybase1.TimeFromSeconds(merkleRoot.Ctime()).Time()
// We delete expired and invalid cache entries but only return the expired.
toDelete := []keybase1.EkGeneration{}
for generation, cacheItem := range cache {
// purge any cached errors here so they don't stick around forever.
if cacheItem.HasError() {
toDelete = append(toDelete, generation)
} else {
keyAge := merkleCtime.Sub(cacheItem.TeamEKBoxed.Ctime().Time())
// TeamEKs will never encrypt new data if the current key is older than
// libkb.EphemeralKeyGenInterval, thus the maximum lifetime of
// ephemeral content will not exceed libkb.MinEphemeralKeyLifetime =
// libkb.MaxEphemeralContentLifetime + libkb.EphemeralKeyGenInterval
if keyAge >= libkb.MinEphemeralKeyLifetime {
expired = append(expired, generation)
}
}
}
toDelete = append(toDelete, expired...)
return expired, s.deleteMany(mctx, teamID, toDelete)
}
func (s *TeamEKBoxStorage) GetAll(mctx libkb.MetaContext, teamID keybase1.TeamID) (teamEKs TeamEKMap, err error) {
defer mctx.Trace(fmt.Sprintf("TeamEKBoxStorage#GetAll: teamID:%v", teamID), &err)()
unlock := s.lockForTeamID(mctx, teamID)
defer unlock()
teamEKs = make(TeamEKMap)
cache, found, err := s.getCacheForTeamID(mctx, teamID)
if err != nil {
return nil, err
} else if !found {
return nil, nil
}
for generation, cacheItem := range cache {
if cacheItem.HasError() {
continue
}
teamEK, err := s.keyer.Unbox(mctx, cacheItem.TeamEKBoxed, nil)
if err != nil {
return nil, err
}
teamEKs[generation] = teamEK
}
return teamEKs, err
}
func (s *TeamEKBoxStorage) ClearCache() {
s.Lock()
defer s.Unlock()
s.cache.Clear()
}
func (s *TeamEKBoxStorage) MaxGeneration(mctx libkb.MetaContext, teamID keybase1.TeamID, includeErrs bool) (maxGeneration keybase1.EkGeneration, err error) {
defer mctx.Trace(fmt.Sprintf("TeamEKBoxStorage#MaxGeneration: teamID:%v", teamID), nil)()
unlock := s.lockForTeamID(mctx, teamID)
defer unlock()
maxGeneration = -1
cache, _, err := s.getCacheForTeamID(mctx, teamID)
if err != nil {
return maxGeneration, err
}
for generation, cacheItem := range cache {
if cacheItem.HasError() && !includeErrs {
continue
}
if generation > maxGeneration {
maxGeneration = generation
}
}
return maxGeneration, nil
}
// --------------------------------------------------
const MemCacheLRUSize = 1000
// Store some TeamEKBoxes's in memory. Threadsafe.
type teamEKCache struct {
lru *lru.Cache
}
func newTeamEKCache() *teamEKCache {
nlru, err := lru.New(MemCacheLRUSize)
if err != nil {
// lru.New only panics if size <= 0
log.Panicf("Could not create lru cache: %v", err)
}
return &teamEKCache{
lru: nlru,
}
}
func (s *teamEKCache) GetMap(mctx libkb.MetaContext, teamID keybase1.TeamID) (cache teamEKBoxCache, found bool) {
untyped, found := s.lru.Get(s.key(mctx, teamID))
if !found {
return nil, found
}
cache, ok := untyped.(teamEKBoxCache)
if !ok {
mctx.Debug("TeamEK teamEKCache got bad type from lru: %T", untyped)
return nil, found
}
return cache, found
}
func (s *teamEKCache) PutMap(mctx libkb.MetaContext, teamID keybase1.TeamID, cache teamEKBoxCache) {
s.lru.Add(s.key(mctx, teamID), cache)
}
func (s *teamEKCache) Clear() {
s.lru.Purge()
}
func (s *teamEKCache) key(mctx libkb.MetaContext, teamID keybase1.TeamID) (key string) {
return teamKey(mctx, teamID)
}