fix: load LDAP users appropriately (#9360)

This PR also fixes issues when

deletePolicy, deleteUser is idempotent so can lead to
issues when client can prematurely timeout, so a retry
call error response should be ignored when call returns
http.StatusNotFound

Fixes #9347

cmd/config-common.go

@@ -50,7 +50,11 @@ func readConfig(ctx context.Context, objAPI ObjectLayer, configFile string) ([]b
 }
 
 func deleteConfig(ctx context.Context, objAPI ObjectLayer, configFile string) error {
-	return objAPI.DeleteObject(ctx, minioMetaBucket, configFile)
+	err := objAPI.DeleteObject(ctx, minioMetaBucket, configFile)
+	if err != nil && isErrObjectNotFound(err) {
+		return errConfigNotFound
+	}
+	return err
 }
 
 func saveConfig(ctx context.Context, objAPI ObjectLayer, configFile string, data []byte) error {

cmd/config-encrypted.go

@@ -50,7 +50,6 @@ func handleEncryptedConfigBackend(objAPI ObjectLayer, server bool) error {
 
 	rquorum := InsufficientReadQuorum{}
 	wquorum := InsufficientWriteQuorum{}
-	bucketNotFound := BucketNotFound{}
 
 	for !stop {
 		select {
@@ -58,7 +57,7 @@ func handleEncryptedConfigBackend(objAPI ObjectLayer, server bool) error {
 			if encrypted, err = checkBackendEncrypted(objAPI); err != nil {
 				if errors.Is(err, errDiskNotFound) ||
 					errors.As(err, &rquorum) ||
-					errors.As(err, &bucketNotFound) {
+					isErrBucketNotFound(err) {
 					logger.Info("Waiting for config backend to be encrypted..")
 					continue
 				}
@@ -108,7 +107,7 @@ func handleEncryptedConfigBackend(objAPI ObjectLayer, server bool) error {
 				if errors.Is(err, errDiskNotFound) ||
 					errors.As(err, &rquorum) ||
 					errors.As(err, &wquorum) ||
-					errors.As(err, &bucketNotFound) {
+					isErrBucketNotFound(err) {
 					logger.Info("Waiting for config backend to be encrypted..")
 					continue
 				}

cmd/iam-object-store.go

@@ -233,11 +233,7 @@ func (iamOS *IAMObjectStore) loadIAMConfig(item interface{}, path string) error
 }
 
 func (iamOS *IAMObjectStore) deleteIAMConfig(path string) error {
-	err := deleteConfig(iamOS.ctx, iamOS.objAPI, path)
-	if _, ok := err.(ObjectNotFound); ok {
-		return errConfigNotFound
-	}
-	return err
+	return deleteConfig(iamOS.ctx, iamOS.objAPI, path)
 }
 
 func (iamOS *IAMObjectStore) loadPolicyDoc(policy string, m map[string]iampolicy.Policy) error {
@@ -428,10 +424,12 @@ func (iamOS *IAMObjectStore) loadAll(ctx context.Context, sys *IAMSys) error {
 	if err := iamOS.loadPolicyDocs(ctx, iamPolicyDocsMap); err != nil {
 		return err
 	}
+
 	// load STS temp users
 	if err := iamOS.loadUsers(ctx, stsUser, iamUsersMap); err != nil {
 		return err
 	}
+
 	if isMinIOUsersSys {
 		if err := iamOS.loadUsers(ctx, regularUser, iamUsersMap); err != nil {
 			return err
@@ -442,15 +440,18 @@ func (iamOS *IAMObjectStore) loadAll(ctx context.Context, sys *IAMSys) error {
 		if err := iamOS.loadGroups(ctx, iamGroupsMap); err != nil {
 			return err
 		}
-
-		if err := iamOS.loadMappedPolicies(ctx, regularUser, false, iamUserPolicyMap); err != nil {
-			return err
-		}
 	}
+
+	// load polices mapped to users
+	if err := iamOS.loadMappedPolicies(ctx, regularUser, false, iamUserPolicyMap); err != nil {
+		return err
+	}
+
 	// load STS policy mappings
 	if err := iamOS.loadMappedPolicies(ctx, stsUser, false, iamUserPolicyMap); err != nil {
 		return err
 	}
+
 	// load policies mapped to groups
 	if err := iamOS.loadMappedPolicies(ctx, regularUser, true, iamGroupPolicyMap); err != nil {
 		return err

cmd/iam.go

@@ -404,8 +404,7 @@ func (sys *IAMSys) DeletePolicy(policyName string) error {
 	defer sys.store.unlock()
 
 	err := sys.store.deletePolicyDoc(policyName)
-	switch err.(type) {
-	case ObjectNotFound:
+	if err == errNoSuchPolicy {
 		// Ignore error if policy is already deleted.
 		err = nil
 	}
@@ -417,7 +416,6 @@ func (sys *IAMSys) DeletePolicy(policyName string) error {
 	var usersType []IAMUserType
 	for u, mp := range sys.iamUserPolicyMap {
 		if mp.Policy == policyName {
-			usersToDel = append(usersToDel, u)
 			cr, ok := sys.iamUsersMap[u]
 			if !ok {
 				// This case cannot happen
@@ -429,6 +427,7 @@ func (sys *IAMSys) DeletePolicy(policyName string) error {
 			} else {
 				usersType = append(usersType, regularUser)
 			}
+			usersToDel = append(usersToDel, u)
 		}
 	}
 	for i, u := range usersToDel {
@@ -538,8 +537,7 @@ func (sys *IAMSys) DeleteUser(accessKey string) error {
 	// It is ok to ignore deletion error on the mapped policy
 	sys.store.deleteMappedPolicy(accessKey, regularUser, false)
 	err := sys.store.deleteUserIdentity(accessKey, regularUser)
-	switch err.(type) {
-	case ObjectNotFound:
+	if err == errNoSuchUser {
 		// ignore if user is already deleted.
 		err = nil
 	}
@@ -1020,14 +1018,11 @@ func (sys *IAMSys) RemoveUsersFromGroup(group string, members []string) error {
 		// len(gi.Members) == 0 here.
 
 		// Remove the group from storage. First delete the
-		// mapped policy.
-		err := sys.store.deleteMappedPolicy(group, regularUser, true)
-		// No-mapped-policy case is ignored.
-		if err != nil && err != errNoSuchPolicy {
+		// mapped policy. No-mapped-policy case is ignored.
+		if err := sys.store.deleteMappedPolicy(group, regularUser, true); err != nil && err != errNoSuchPolicy {
 			return err
 		}
-		err = sys.store.deleteGroupInfo(group)
-		if err != nil {
+		if err := sys.store.deleteGroupInfo(group); err != nil && err != errNoSuchGroup {
 			return err
 		}
 
@@ -1195,7 +1190,7 @@ func (sys *IAMSys) policyDBSet(name, policy string, userType IAMUserType, isGrou
 
 	// Handle policy mapping removal
 	if policy == "" {
-		if err := sys.store.deleteMappedPolicy(name, userType, isGroup); err != nil {
+		if err := sys.store.deleteMappedPolicy(name, userType, isGroup); err != nil && err != errNoSuchPolicy {
 			return err
 		}
 		if !isGroup {

pkg/madmin/retry.go

@@ -168,6 +168,7 @@ func isS3CodeRetryable(s3Code string) (ok bool) {
 
 // List of HTTP status codes which are retryable.
 var retryableHTTPStatusCodes = map[int]struct{}{
+	http.StatusRequestTimeout:      {},
 	http.StatusTooManyRequests:     {},
 	http.StatusInternalServerError: {},
 	http.StatusBadGateway:          {},