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fix: sts accounts map refresh and fewer list calls (#19376) 

This fixes a bug where STS Accounts map accumulates accounts in memory
and never removes expired accounts and the STS Policy mappings were not
being refreshed.

The STS purge routine now runs with every IAM credentials load instead
of every 4th time.

The listing of IAM files is now cached on every IAM load operation to
prevent re-listing for STS accounts purging/reload.

Additionally this change makes each server pick a time for IAM loading
that is randomly distributed from a 10 minute interval - this is to
prevent server from thundering while performing the IAM load.

On average, IAM loading will happen between every 5-15min after the
previous IAM load operation completes.
This commit is contained in:
Aditya Manthramurthy 2024-03-28 16:43:50 -07:00 committed by GitHub
parent 2eee744e34
commit 48deccdc40
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 99 additions and 71 deletions
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103
cmd/iam-object-store.go
View File

@ -25,12 +25,12 @@ import (
"path"
"strings"
"sync"
"sync/atomic"
"time"
"unicode/utf8"
jsoniter "github.com/json-iterator/go"
"github.com/minio/madmin-go/v3"
"github.com/minio/minio-go/v7/pkg/set"
"github.com/minio/minio/internal/config"
xioutil "github.com/minio/minio/internal/ioutil"
"github.com/minio/minio/internal/kms"
@ -45,6 +45,8 @@ type IAMObjectStore struct {
*iamCache
cachedIAMListing atomic.Value
usersSysType UsersSysType
objAPI ObjectLayer
@ -400,46 +402,38 @@ var (
stsListKey = "sts/"
policyDBUsersListKey = "policydb/users/"
policyDBSTSUsersListKey = "policydb/sts-users/"
policyDBServiceAccountsListKey = "policydb/service-accounts/"
policyDBGroupsListKey = "policydb/groups/"
)
// List of directories from which to read iam data into memory.
allListKeys = []string{
usersListKey,
svcAccListKey,
groupsListKey,
policiesListKey,
stsListKey,
policyDBUsersListKey,
policyDBSTSUsersListKey,
policyDBServiceAccountsListKey,
policyDBGroupsListKey,
// splitPath splits a path into a top-level directory and a child item. The
// parent directory retains the trailing slash.
func splitPath(s string) (string, string) {
i := strings.Index(s, "/")
if i == -1 {
return s, ""
}
// Include the trailing slash in the parent directory.
return s[:i+1], s[i+1:]
}
// List of directories to skip: we do not read STS directories for better
// performance. STS credentials would be stored in memory when they are
// first used.
iamLoadSkipListKeySet = set.CreateStringSet(
stsListKey,
policyDBSTSUsersListKey,
)
)
func (iamOS *IAMObjectStore) listAllIAMConfigItems(ctx context.Context) (map[string][]string, error) {
res := make(map[string][]string)
ctx, cancel := context.WithCancel(ctx)
defer cancel()
for _, listKey := range allListKeys {
if iamLoadSkipListKeySet.Contains(listKey) {
continue
}
for item := range listIAMConfigItems(ctx, iamOS.objAPI, iamConfigPrefix+SlashSeparator+listKey) {
for item := range listIAMConfigItems(ctx, iamOS.objAPI, iamConfigPrefix+SlashSeparator) {
if item.Err != nil {
return nil, item.Err
}
res[listKey] = append(res[listKey], item.Item)
listKey, trimmedItem := splitPath(item.Item)
if listKey == iamFormatFile {
continue
}
res[listKey] = append(res[listKey], trimmedItem)
}
// Store the listing for later re-use.
iamOS.cachedIAMListing.Store(res)
return res, nil
}
@ -450,22 +444,47 @@ func (iamOS *IAMObjectStore) PurgeExpiredSTS(ctx context.Context) error {
}
bootstrapTraceMsg("purging expired STS credentials")
iamListing, ok := iamOS.cachedIAMListing.Load().(map[string][]string)
if !ok {
// There has been no store yet. This should never happen!
logger.LogIf(GlobalContext, errors.New("WARNING: no cached IAM listing found"))
return nil
}
// Scan STS users on disk and purge expired ones. We do not need to hold a
// lock with store.lock() here.
for item := range listIAMConfigItems(ctx, iamOS.objAPI, iamConfigPrefix+SlashSeparator+stsListKey) {
if item.Err != nil {
return item.Err
}
userName := path.Dir(item.Item)
// loadUser() will delete expired user during the load - we do not need
// to keep the loaded user around in memory, so we reinitialize the map
// each time.
m := map[string]UserIdentity{}
if err := iamOS.loadUser(ctx, userName, stsUser, m); err != nil && err != errNoSuchUser {
logger.LogIf(GlobalContext, fmt.Errorf("unable to load user during STS purge: %w (%s)", err, item.Item))
stsAccountsFromStore := map[string]UserIdentity{}
stsAccPoliciesFromStore := xsync.NewMapOf[string, MappedPolicy]()
for _, item := range iamListing[stsListKey] {
userName := path.Dir(item)
// loadUser() will delete expired user during the load.
err := iamOS.loadUser(ctx, userName, stsUser, stsAccountsFromStore)
if err != nil && !errors.Is(err, errNoSuchUser) {
logger.LogIf(GlobalContext,
fmt.Errorf("unable to load user during STS purge: %w (%s)", err, item))
}
}
// Loading the STS policy mappings from disk ensures that stale entries
// (removed during loadUser() in the loop above) are removed from memory.
for _, item := range iamListing[policyDBSTSUsersListKey] {
stsName := strings.TrimSuffix(item, ".json")
err := iamOS.loadMappedPolicy(ctx, stsName, stsUser, false, stsAccPoliciesFromStore)
if err != nil && !errors.Is(err, errNoSuchPolicy) {
logger.LogIf(GlobalContext,
fmt.Errorf("unable to load policies during STS purge: %w (%s)", err, item))
}
}
// Store the newly populated map in the iam cache. This takes care of
// removing stale entries from the existing map.
iamOS.Lock()
defer iamOS.Unlock()
iamOS.iamCache.iamSTSAccountsMap = stsAccountsFromStore
iamOS.iamCache.iamSTSPolicyMap = stsAccPoliciesFromStore
return nil
}
@ -626,10 +645,8 @@ type itemOrErr struct {
Err error
}
// Lists files or dirs in the minioMetaBucket at the given path
// prefix. If dirs is true, only directories are listed, otherwise
// only objects are listed. All returned items have the pathPrefix
// removed from their names.
// Lists objects in the minioMetaBucket at the given path prefix. All returned
// items have the pathPrefix removed from their names.
func listIAMConfigItems(ctx context.Context, objAPI ObjectLayer, pathPrefix string) <-chan itemOrErr {
ch := make(chan itemOrErr)

27
cmd/iam.go
View File

@ -362,13 +362,24 @@ func (sys *IAMSys) periodicRoutines(ctx context.Context, baseInterval time.Durat
}
r := rand.New(rand.NewSource(time.Now().UnixNano()))
// Add a random interval of up to 20% of the base interval.
randInterval := func() time.Duration {
return time.Duration(r.Float64() * float64(baseInterval) * 0.2)
// Calculate the waitInterval between periodic refreshes so that each server
// independently picks a (uniformly distributed) random time in an interval
// of size = baseInterval.
//
// For example:
//
// - if baseInterval=10s, then 5s <= waitInterval() < 15s
//
// - if baseInterval=10m, then 5m <= waitInterval() < 15m
waitInterval := func() time.Duration {
// Calculate a random value such that 0 <= value < baseInterval
randAmt := time.Duration(r.Float64() * float64(baseInterval))
return baseInterval/2 + randAmt
}
var maxDurationSecondsForLog float64 = 5
timer := time.NewTimer(baseInterval + randInterval())
timer := time.NewTimer(waitInterval())
defer timer.Stop()
for {
@ -386,9 +397,6 @@ func (sys *IAMSys) periodicRoutines(ctx context.Context, baseInterval time.Durat
}
}
// The following actions are performed about once in 4 times that
// IAM is refreshed:
if r.Intn(4) == 0 {
// Purge expired STS credentials.
purgeStart := time.Now()
if err := sys.store.PurgeExpiredSTS(ctx); err != nil {
@ -401,6 +409,9 @@ func (sys *IAMSys) periodicRoutines(ctx context.Context, baseInterval time.Durat
}
}
// The following actions are performed about once in 4 times that
// IAM is refreshed:
if r.Intn(4) == 0 {
// Poll and remove accounts for those users who were removed
// from LDAP/OpenID.
if sys.LDAPConfig.Enabled() {
@ -412,7 +423,7 @@ func (sys *IAMSys) periodicRoutines(ctx context.Context, baseInterval time.Durat
}
}
timer.Reset(baseInterval + randInterval())
timer.Reset(waitInterval())
case <-ctx.Done():
return
}