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minio/cmd/iam-object-store.go

582 lines
14 KiB

/*
* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"context"
"encoding/json"
"errors"
"strings"
"sync"
"time"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/auth"
iampolicy "github.com/minio/minio/pkg/iam/policy"
)
// IAMObjectStore implements IAMStorageAPI
type IAMObjectStore struct {
// Protect assignment to objAPI
sync.RWMutex
objAPI ObjectLayer
}
func newIAMObjectStore() *IAMObjectStore {
return &IAMObjectStore{objAPI: nil}
}
func (iamOS *IAMObjectStore) getObjectAPI() ObjectLayer {
iamOS.RLock()
defer iamOS.RUnlock()
if iamOS.objAPI != nil {
return iamOS.objAPI
}
return newObjectLayerFn()
}
func (iamOS *IAMObjectStore) setObjectAPI(objAPI ObjectLayer) {
iamOS.Lock()
defer iamOS.Unlock()
iamOS.objAPI = objAPI
}
func (iamOS *IAMObjectStore) clearObjectAPI() {
iamOS.Lock()
defer iamOS.Unlock()
iamOS.objAPI = nil
}
// Migrate users directory in a single scan.
//
// 1. Migrate user policy from:
//
// `iamConfigUsersPrefix + "<username>/policy.json"`
//
// to:
//
// `iamConfigPolicyDBUsersPrefix + "<username>.json"`.
//
// 2. Add versioning to the policy json file in the new
// location.
//
// 3. Migrate user identity json file to include version info.
func (iamOS *IAMObjectStore) migrateUsersConfigToV1(isSTS bool) error {
basePrefix := iamConfigUsersPrefix
if isSTS {
basePrefix = iamConfigSTSPrefix
}
objAPI := iamOS.getObjectAPI()
doneCh := make(chan struct{})
defer close(doneCh)
for item := range listIAMConfigItems(objAPI, basePrefix, true, doneCh) {
if item.Err != nil {
return item.Err
}
user := item.Item
{
// 1. check if there is policy file in old location.
oldPolicyPath := pathJoin(basePrefix, user, iamPolicyFile)
var policyName string
if err := iamOS.loadIAMConfig(&policyName, oldPolicyPath); err != nil {
switch err {
case errConfigNotFound:
// This case means it is already
// migrated or there is no policy on
// user.
default:
// File may be corrupt or network error
}
// Nothing to do on the policy file,
// so move on to check the id file.
goto next
}
// 2. copy policy file to new location.
mp := newMappedPolicy(policyName)
if err := iamOS.saveMappedPolicy(user, isSTS, false, mp); err != nil {
return err
}
// 3. delete policy file from old
// location. Ignore error.
iamOS.deleteIAMConfig(oldPolicyPath)
}
next:
// 4. check if user identity has old format.
identityPath := pathJoin(basePrefix, user, iamIdentityFile)
var cred auth.Credentials
if err := iamOS.loadIAMConfig(&cred, identityPath); err != nil {
switch err {
case errConfigNotFound:
// This should not happen.
default:
// File may be corrupt or network error
}
continue
}
// If the file is already in the new format,
// then the parsed auth.Credentials will have
// the zero value for the struct.
var zeroCred auth.Credentials
if cred == zeroCred {
// nothing to do
continue
}
// Found a id file in old format. Copy value
// into new format and save it.
cred.AccessKey = user
u := newUserIdentity(cred)
if err := iamOS.saveIAMConfig(u, identityPath); err != nil {
logger.LogIf(context.Background(), err)
return err
}
// Nothing to delete as identity file location
// has not changed.
}
return nil
}
func (iamOS *IAMObjectStore) migrateToV1() error {
var iamFmt iamFormat
path := getIAMFormatFilePath()
if err := iamOS.loadIAMConfig(&iamFmt, path); err != nil {
switch err {
case errConfigNotFound:
// Need to migrate to V1.
default:
return err
}
} else {
if iamFmt.Version >= iamFormatVersion1 {
// Nothing to do.
return nil
}
// This case should not happen
// (i.e. Version is 0 or negative.)
return errors.New("got an invalid IAM format version")
}
// Migrate long-term users
if err := iamOS.migrateUsersConfigToV1(false); err != nil {
logger.LogIf(context.Background(), err)
return err
}
// Migrate STS users
if err := iamOS.migrateUsersConfigToV1(true); err != nil {
logger.LogIf(context.Background(), err)
return err
}
// Save iam format to version 1.
if err := iamOS.saveIAMConfig(newIAMFormatVersion1(), path); err != nil {
logger.LogIf(context.Background(), err)
return err
}
return nil
}
// Should be called under config migration lock
func (iamOS *IAMObjectStore) migrateBackendFormat(objAPI ObjectLayer) error {
iamOS.setObjectAPI(objAPI)
defer iamOS.clearObjectAPI()
if err := iamOS.migrateToV1(); err != nil {
return err
}
return nil
}
func (iamOS *IAMObjectStore) saveIAMConfig(item interface{}, path string) error {
objectAPI := iamOS.getObjectAPI()
data, err := json.Marshal(item)
if err != nil {
return err
}
return saveConfig(context.Background(), objectAPI, path, data)
}
func (iamOS *IAMObjectStore) loadIAMConfig(item interface{}, path string) error {
objectAPI := iamOS.getObjectAPI()
data, err := readConfig(context.Background(), objectAPI, path)
if err != nil {
return err
}
return json.Unmarshal(data, item)
}
func (iamOS *IAMObjectStore) deleteIAMConfig(path string) error {
err := deleteConfig(context.Background(), iamOS.getObjectAPI(), path)
if _, ok := err.(ObjectNotFound); ok {
return errConfigNotFound
}
return err
}
func (iamOS *IAMObjectStore) loadPolicyDoc(policy string, m map[string]iampolicy.Policy) error {
objectAPI := iamOS.getObjectAPI()
if objectAPI == nil {
return errServerNotInitialized
}
var p iampolicy.Policy
err := iamOS.loadIAMConfig(&p, getPolicyDocPath(policy))
if err != nil {
return err
}
m[policy] = p
return nil
}
func (iamOS *IAMObjectStore) loadPolicyDocs(m map[string]iampolicy.Policy) error {
objectAPI := iamOS.getObjectAPI()
if objectAPI == nil {
return errServerNotInitialized
}
doneCh := make(chan struct{})
defer close(doneCh)
for item := range listIAMConfigItems(objectAPI, iamConfigPoliciesPrefix, true, doneCh) {
if item.Err != nil {
return item.Err
}
policyName := item.Item
err := iamOS.loadPolicyDoc(policyName, m)
if err != nil {
return err
}
}
return nil
}
func (iamOS *IAMObjectStore) loadUser(user string, isSTS bool, m map[string]auth.Credentials) error {
objectAPI := iamOS.getObjectAPI()
if objectAPI == nil {
return errServerNotInitialized
}
var u UserIdentity
err := iamOS.loadIAMConfig(&u, getUserIdentityPath(user, isSTS))
if err != nil {
return err
}
if u.Credentials.IsExpired() {
// Delete expired identity - ignoring errors here.
iamOS.deleteIAMConfig(getUserIdentityPath(user, isSTS))
iamOS.deleteIAMConfig(getMappedPolicyPath(user, isSTS, false))
return nil
}
if u.Credentials.AccessKey == "" {
u.Credentials.AccessKey = user
}
m[user] = u.Credentials
return nil
}
func (iamOS *IAMObjectStore) loadUsers(isSTS bool, m map[string]auth.Credentials) error {
objectAPI := iamOS.getObjectAPI()
if objectAPI == nil {
return errServerNotInitialized
}
doneCh := make(chan struct{})
defer close(doneCh)
basePrefix := iamConfigUsersPrefix
if isSTS {
basePrefix = iamConfigSTSPrefix
}
for item := range listIAMConfigItems(objectAPI, basePrefix, true, doneCh) {
if item.Err != nil {
return item.Err
}
userName := item.Item
err := iamOS.loadUser(userName, isSTS, m)
if err != nil {
return err
}
}
return nil
}
func (iamOS *IAMObjectStore) loadGroup(group string, m map[string]GroupInfo) error {
objectAPI := iamOS.getObjectAPI()
if objectAPI == nil {
return errServerNotInitialized
}
var g GroupInfo
err := iamOS.loadIAMConfig(&g, getGroupInfoPath(group))
if err != nil {
return err
}
m[group] = g
return nil
}
func (iamOS *IAMObjectStore) loadGroups(m map[string]GroupInfo) error {
objectAPI := iamOS.getObjectAPI()
if objectAPI == nil {
return errServerNotInitialized
}
doneCh := make(chan struct{})
defer close(doneCh)
for item := range listIAMConfigItems(objectAPI, iamConfigGroupsPrefix, true, doneCh) {
if item.Err != nil {
return item.Err
}
group := item.Item
err := iamOS.loadGroup(group, m)
if err != nil {
return err
}
}
return nil
}
func (iamOS *IAMObjectStore) loadMappedPolicy(name string, isSTS, isGroup bool,
m map[string]MappedPolicy) error {
objectAPI := iamOS.getObjectAPI()
if objectAPI == nil {
return errServerNotInitialized
}
var p MappedPolicy
err := iamOS.loadIAMConfig(&p, getMappedPolicyPath(name, isSTS, isGroup))
if err != nil {
return err
}
m[name] = p
return nil
}
func (iamOS *IAMObjectStore) loadMappedPolicies(isSTS, isGroup bool, m map[string]MappedPolicy) error {
objectAPI := iamOS.getObjectAPI()
if objectAPI == nil {
return errServerNotInitialized
}
doneCh := make(chan struct{})
defer close(doneCh)
var basePath string
switch {
case isSTS:
basePath = iamConfigPolicyDBSTSUsersPrefix
case isGroup:
basePath = iamConfigPolicyDBGroupsPrefix
default:
basePath = iamConfigPolicyDBUsersPrefix
}
for item := range listIAMConfigItems(objectAPI, basePath, false, doneCh) {
if item.Err != nil {
return item.Err
}
policyFile := item.Item
userOrGroupName := strings.TrimSuffix(policyFile, ".json")
err := iamOS.loadMappedPolicy(userOrGroupName, isSTS, isGroup, m)
if err != nil {
return err
}
}
return nil
}
// Refresh IAMSys. If an object layer is passed in use that, otherwise
// load from global.
func (iamOS *IAMObjectStore) loadAll(sys *IAMSys, objectAPI ObjectLayer) error {
if objectAPI == nil {
objectAPI = iamOS.getObjectAPI()
}
if objectAPI == nil {
return errServerNotInitialized
}
// cache object layer for other load* functions
iamOS.setObjectAPI(objectAPI)
defer iamOS.clearObjectAPI()
iamUsersMap := make(map[string]auth.Credentials)
iamGroupsMap := make(map[string]GroupInfo)
iamPolicyDocsMap := make(map[string]iampolicy.Policy)
iamUserPolicyMap := make(map[string]MappedPolicy)
iamGroupPolicyMap := make(map[string]MappedPolicy)
if err := iamOS.loadPolicyDocs(iamPolicyDocsMap); err != nil {
return err
}
if err := iamOS.loadUsers(false, iamUsersMap); err != nil {
return err
}
// load STS temp users into the same map
if err := iamOS.loadUsers(true, iamUsersMap); err != nil {
return err
}
if err := iamOS.loadGroups(iamGroupsMap); err != nil {
return err
}
if err := iamOS.loadMappedPolicies(false, false, iamUserPolicyMap); err != nil {
return err
}
// load STS policy mappings into the same map
if err := iamOS.loadMappedPolicies(true, false, iamUserPolicyMap); err != nil {
return err
}
// load policies mapped to groups
if err := iamOS.loadMappedPolicies(false, true, iamGroupPolicyMap); err != nil {
return err
}
// Sets default canned policies, if none are set.
setDefaultCannedPolicies(iamPolicyDocsMap)
sys.Lock()
defer sys.Unlock()
sys.iamUsersMap = iamUsersMap
sys.iamPolicyDocsMap = iamPolicyDocsMap
sys.iamUserPolicyMap = iamUserPolicyMap
sys.iamGroupPolicyMap = iamGroupPolicyMap
sys.iamGroupsMap = iamGroupsMap
sys.buildUserGroupMemberships()
return nil
}
func (iamOS *IAMObjectStore) savePolicyDoc(policyName string, p iampolicy.Policy) error {
return iamOS.saveIAMConfig(&p, getPolicyDocPath(policyName))
}
func (iamOS *IAMObjectStore) saveMappedPolicy(name string, isSTS, isGroup bool, mp MappedPolicy) error {
return iamOS.saveIAMConfig(mp, getMappedPolicyPath(name, isSTS, isGroup))
}
func (iamOS *IAMObjectStore) saveUserIdentity(name string, isSTS bool, u UserIdentity) error {
return iamOS.saveIAMConfig(u, getUserIdentityPath(name, isSTS))
}
func (iamOS *IAMObjectStore) saveGroupInfo(name string, gi GroupInfo) error {
return iamOS.saveIAMConfig(gi, getGroupInfoPath(name))
}
func (iamOS *IAMObjectStore) deletePolicyDoc(name string) error {
return iamOS.deleteIAMConfig(getPolicyDocPath(name))
}
func (iamOS *IAMObjectStore) deleteMappedPolicy(name string, isSTS, isGroup bool) error {
return iamOS.deleteIAMConfig(getMappedPolicyPath(name, isSTS, isGroup))
}
func (iamOS *IAMObjectStore) deleteUserIdentity(name string, isSTS bool) error {
return iamOS.deleteIAMConfig(getUserIdentityPath(name, isSTS))
}
func (iamOS *IAMObjectStore) deleteGroupInfo(name string) error {
return iamOS.deleteIAMConfig(getGroupInfoPath(name))
}
// helper type for listIAMConfigItems
type itemOrErr struct {
Item string
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.
func listIAMConfigItems(objectAPI ObjectLayer, pathPrefix string, dirs bool,
doneCh <-chan struct{}) <-chan itemOrErr {
ch := make(chan itemOrErr)
dirList := func(lo ListObjectsInfo) []string {
return lo.Prefixes
}
filesList := func(lo ListObjectsInfo) (r []string) {
for _, o := range lo.Objects {
r = append(r, o.Name)
}
return r
}
go func() {
marker := ""
for {
lo, err := objectAPI.ListObjects(context.Background(),
minioMetaBucket, pathPrefix, marker, SlashSeparator, 1000)
if err != nil {
select {
case ch <- itemOrErr{Err: err}:
case <-doneCh:
}
close(ch)
return
}
marker = lo.NextMarker
lister := dirList(lo)
if !dirs {
lister = filesList(lo)
}
for _, itemPrefix := range lister {
item := strings.TrimPrefix(itemPrefix, pathPrefix)
item = strings.TrimSuffix(item, SlashSeparator)
select {
case ch <- itemOrErr{Item: item}:
case <-doneCh:
close(ch)
return
}
}
if !lo.IsTruncated {
close(ch)
return
}
}
}()
return ch
}
func (iamOS *IAMObjectStore) watch(sys *IAMSys) {
watchDisk := func() {
ticker := time.NewTicker(globalRefreshIAMInterval)
defer ticker.Stop()
for {
select {
case <-GlobalServiceDoneCh:
return
case <-ticker.C:
iamOS.loadAll(sys, nil)
}
}
}
// Refresh IAMSys in background.
go watchDisk()
}