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minio/cmd/iam-object-store.go

632 lines
16 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 (
"bytes"
"context"
"encoding/json"
"errors"
"strings"
"sync"
"time"
"unicode/utf8"
jwtgo "github.com/dgrijalva/jwt-go"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/auth"
iampolicy "github.com/minio/minio/pkg/iam/policy"
"github.com/minio/minio/pkg/madmin"
)
// IAMObjectStore implements IAMStorageAPI
type IAMObjectStore struct {
// Protect assignment to objAPI
sync.RWMutex
ctx context.Context
objAPI ObjectLayer
}
func newIAMObjectStore(ctx context.Context, objAPI ObjectLayer) *IAMObjectStore {
return &IAMObjectStore{ctx: ctx, objAPI: objAPI}
}
func (iamOS *IAMObjectStore) lock() {
iamOS.Lock()
}
func (iamOS *IAMObjectStore) unlock() {
iamOS.Unlock()
}
func (iamOS *IAMObjectStore) rlock() {
iamOS.RLock()
}
func (iamOS *IAMObjectStore) runlock() {
iamOS.RUnlock()
}
// 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(ctx context.Context, isSTS bool) error {
basePrefix := iamConfigUsersPrefix
if isSTS {
basePrefix = iamConfigSTSPrefix
}
for item := range listIAMConfigItems(ctx, iamOS.objAPI, basePrefix, true) {
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)
userType := regularUser
if isSTS {
userType = stsUser
}
if err := iamOS.saveMappedPolicy(user, userType, 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.Equal(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(ctx, err)
return err
}
// Nothing to delete as identity file location
// has not changed.
}
return nil
}
func (iamOS *IAMObjectStore) migrateToV1(ctx context.Context) 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(ctx, false); err != nil {
logger.LogIf(ctx, err)
return err
}
// Migrate STS users
if err := iamOS.migrateUsersConfigToV1(ctx, true); err != nil {
logger.LogIf(ctx, err)
return err
}
// Save iam format to version 1.
if err := iamOS.saveIAMConfig(newIAMFormatVersion1(), path); err != nil {
logger.LogIf(ctx, err)
return err
}
return nil
}
// Should be called under config migration lock
func (iamOS *IAMObjectStore) migrateBackendFormat(ctx context.Context) error {
return iamOS.migrateToV1(ctx)
}
func (iamOS *IAMObjectStore) saveIAMConfig(item interface{}, path string) error {
data, err := json.Marshal(item)
if err != nil {
return err
}
if globalConfigEncrypted {
data, err = madmin.EncryptData(globalActiveCred.String(), data)
if err != nil {
return err
}
}
return saveConfig(GlobalContext, iamOS.objAPI, path, data)
}
func (iamOS *IAMObjectStore) loadIAMConfig(item interface{}, path string) error {
data, err := readConfig(iamOS.ctx, iamOS.objAPI, path)
if err != nil {
return err
}
if globalConfigEncrypted && !utf8.Valid(data) {
data, err = madmin.DecryptData(globalActiveCred.String(), bytes.NewReader(data))
if err != nil {
return err
}
}
return json.Unmarshal(data, item)
}
func (iamOS *IAMObjectStore) deleteIAMConfig(path string) error {
return deleteConfig(iamOS.ctx, iamOS.objAPI, path)
}
func (iamOS *IAMObjectStore) loadPolicyDoc(policy string, m map[string]iampolicy.Policy) error {
var p iampolicy.Policy
err := iamOS.loadIAMConfig(&p, getPolicyDocPath(policy))
if err != nil {
if err == errConfigNotFound {
return errNoSuchPolicy
}
return err
}
m[policy] = p
return nil
}
func (iamOS *IAMObjectStore) loadPolicyDocs(ctx context.Context, m map[string]iampolicy.Policy) error {
for item := range listIAMConfigItems(ctx, iamOS.objAPI, iamConfigPoliciesPrefix, true) {
if item.Err != nil {
return item.Err
}
policyName := item.Item
if err := iamOS.loadPolicyDoc(policyName, m); err != nil && err != errNoSuchPolicy {
return err
}
}
return nil
}
func (iamOS *IAMObjectStore) loadUser(user string, userType IAMUserType, m map[string]auth.Credentials) error {
var u UserIdentity
err := iamOS.loadIAMConfig(&u, getUserIdentityPath(user, userType))
if err != nil {
if err == errConfigNotFound {
return errNoSuchUser
}
return err
}
if u.Credentials.IsExpired() {
// Delete expired identity - ignoring errors here.
iamOS.deleteIAMConfig(getUserIdentityPath(user, userType))
iamOS.deleteIAMConfig(getMappedPolicyPath(user, userType, false))
return nil
}
// If this is a service account, rotate the session key if needed
if globalOldCred.IsValid() && u.Credentials.IsServiceAccount() {
if !globalOldCred.Equal(globalActiveCred) {
m := jwtgo.MapClaims{}
stsTokenCallback := func(t *jwtgo.Token) (interface{}, error) {
return []byte(globalOldCred.SecretKey), nil
}
if _, err := jwtgo.ParseWithClaims(u.Credentials.SessionToken, m, stsTokenCallback); err == nil {
jwt := jwtgo.NewWithClaims(jwtgo.SigningMethodHS512, jwtgo.MapClaims(m))
if token, err := jwt.SignedString([]byte(globalActiveCred.SecretKey)); err == nil {
u.Credentials.SessionToken = token
err := iamOS.saveIAMConfig(&u, getUserIdentityPath(user, userType))
if err != nil {
return err
}
}
}
}
}
if u.Credentials.AccessKey == "" {
u.Credentials.AccessKey = user
}
m[user] = u.Credentials
return nil
}
func (iamOS *IAMObjectStore) loadUsers(ctx context.Context, userType IAMUserType, m map[string]auth.Credentials) error {
var basePrefix string
switch userType {
case srvAccUser:
basePrefix = iamConfigServiceAccountsPrefix
case stsUser:
basePrefix = iamConfigSTSPrefix
default:
basePrefix = iamConfigUsersPrefix
}
for item := range listIAMConfigItems(ctx, iamOS.objAPI, basePrefix, true) {
if item.Err != nil {
return item.Err
}
userName := item.Item
if err := iamOS.loadUser(userName, userType, m); err != nil && err != errNoSuchUser {
return err
}
}
return nil
}
func (iamOS *IAMObjectStore) loadGroup(group string, m map[string]GroupInfo) error {
var g GroupInfo
err := iamOS.loadIAMConfig(&g, getGroupInfoPath(group))
if err != nil {
if err == errConfigNotFound {
return errNoSuchGroup
}
return err
}
m[group] = g
return nil
}
func (iamOS *IAMObjectStore) loadGroups(ctx context.Context, m map[string]GroupInfo) error {
for item := range listIAMConfigItems(ctx, iamOS.objAPI, iamConfigGroupsPrefix, true) {
if item.Err != nil {
return item.Err
}
group := item.Item
if err := iamOS.loadGroup(group, m); err != nil && err != errNoSuchGroup {
return err
}
}
return nil
}
func (iamOS *IAMObjectStore) loadMappedPolicy(name string, userType IAMUserType, isGroup bool,
m map[string]MappedPolicy) error {
var p MappedPolicy
err := iamOS.loadIAMConfig(&p, getMappedPolicyPath(name, userType, isGroup))
if err != nil {
if err == errConfigNotFound {
return errNoSuchPolicy
}
return err
}
m[name] = p
return nil
}
func (iamOS *IAMObjectStore) loadMappedPolicies(ctx context.Context, userType IAMUserType, isGroup bool, m map[string]MappedPolicy) error {
var basePath string
if isGroup {
basePath = iamConfigPolicyDBGroupsPrefix
} else {
switch userType {
case srvAccUser:
basePath = iamConfigPolicyDBServiceAccountsPrefix
case stsUser:
basePath = iamConfigPolicyDBSTSUsersPrefix
default:
basePath = iamConfigPolicyDBUsersPrefix
}
}
for item := range listIAMConfigItems(ctx, iamOS.objAPI, basePath, false) {
if item.Err != nil {
return item.Err
}
policyFile := item.Item
userOrGroupName := strings.TrimSuffix(policyFile, ".json")
if err := iamOS.loadMappedPolicy(userOrGroupName, userType, isGroup, m); err != nil && err != errNoSuchPolicy {
return err
}
}
return nil
}
// Refresh IAMSys. If an object layer is passed in use that, otherwise
// load from global.
func (iamOS *IAMObjectStore) loadAll(ctx context.Context, sys *IAMSys) error {
iamUsersMap := make(map[string]auth.Credentials)
iamGroupsMap := make(map[string]GroupInfo)
iamUserPolicyMap := make(map[string]MappedPolicy)
iamGroupPolicyMap := make(map[string]MappedPolicy)
iamOS.rlock()
isMinIOUsersSys := sys.usersSysType == MinIOUsersSysType
iamOS.runlock()
iamOS.lock()
if err := iamOS.loadPolicyDocs(ctx, sys.iamPolicyDocsMap); err != nil {
iamOS.unlock()
return err
}
// Sets default canned policies, if none are set.
setDefaultCannedPolicies(sys.iamPolicyDocsMap)
iamOS.unlock()
if isMinIOUsersSys {
if err := iamOS.loadUsers(ctx, regularUser, iamUsersMap); err != nil {
return err
}
if err := iamOS.loadGroups(ctx, iamGroupsMap); err != nil {
return err
}
}
// load polices mapped to users
if err := iamOS.loadMappedPolicies(ctx, regularUser, false, iamUserPolicyMap); err != nil {
return err
}
// load policies mapped to groups
if err := iamOS.loadMappedPolicies(ctx, regularUser, true, iamGroupPolicyMap); err != nil {
return err
}
if err := iamOS.loadUsers(ctx, srvAccUser, iamUsersMap); err != nil {
return err
}
// load STS temp users
if err := iamOS.loadUsers(ctx, stsUser, iamUsersMap); err != nil {
return err
}
// load STS policy mappings
if err := iamOS.loadMappedPolicies(ctx, stsUser, false, iamUserPolicyMap); err != nil {
return err
}
iamOS.lock()
defer iamOS.unlock()
// Merge the new reloaded entries into global map.
// See issue https://github.com/minio/minio/issues/9651
// where the present list of entries on disk are not yet
// latest, there is a small window where this can make
// valid users invalid.
for k, v := range iamUsersMap {
sys.iamUsersMap[k] = v
}
for k, v := range iamUserPolicyMap {
sys.iamUserPolicyMap[k] = v
}
// purge any expired entries which became expired now.
var expiredEntries []string
for k, v := range sys.iamUsersMap {
if v.IsExpired() {
delete(sys.iamUsersMap, k)
delete(sys.iamUserPolicyMap, k)
expiredEntries = append(expiredEntries, k)
// Deleting on the disk is taken care of in the next cycle
}
}
for _, v := range sys.iamUsersMap {
if v.IsServiceAccount() {
for _, accessKey := range expiredEntries {
if v.ParentUser == accessKey {
_ = iamOS.deleteUserIdentity(v.AccessKey, srvAccUser)
delete(sys.iamUsersMap, v.AccessKey)
}
}
}
}
for k, v := range iamGroupPolicyMap {
sys.iamGroupPolicyMap[k] = v
}
for k, v := range iamGroupsMap {
sys.iamGroupsMap[k] = v
}
sys.buildUserGroupMemberships()
sys.storeFallback = false
return nil
}
func (iamOS *IAMObjectStore) savePolicyDoc(policyName string, p iampolicy.Policy) error {
return iamOS.saveIAMConfig(&p, getPolicyDocPath(policyName))
}
func (iamOS *IAMObjectStore) saveMappedPolicy(name string, userType IAMUserType, isGroup bool, mp MappedPolicy) error {
return iamOS.saveIAMConfig(mp, getMappedPolicyPath(name, userType, isGroup))
}
func (iamOS *IAMObjectStore) saveUserIdentity(name string, userType IAMUserType, u UserIdentity) error {
return iamOS.saveIAMConfig(u, getUserIdentityPath(name, userType))
}
func (iamOS *IAMObjectStore) saveGroupInfo(name string, gi GroupInfo) error {
return iamOS.saveIAMConfig(gi, getGroupInfoPath(name))
}
func (iamOS *IAMObjectStore) deletePolicyDoc(name string) error {
err := iamOS.deleteIAMConfig(getPolicyDocPath(name))
if err == errConfigNotFound {
err = errNoSuchPolicy
}
return err
}
func (iamOS *IAMObjectStore) deleteMappedPolicy(name string, userType IAMUserType, isGroup bool) error {
err := iamOS.deleteIAMConfig(getMappedPolicyPath(name, userType, isGroup))
if err == errConfigNotFound {
err = errNoSuchPolicy
}
return err
}
func (iamOS *IAMObjectStore) deleteUserIdentity(name string, userType IAMUserType) error {
err := iamOS.deleteIAMConfig(getUserIdentityPath(name, userType))
if err == errConfigNotFound {
err = errNoSuchUser
}
return err
}
func (iamOS *IAMObjectStore) deleteGroupInfo(name string) error {
err := iamOS.deleteIAMConfig(getGroupInfoPath(name))
if err == errConfigNotFound {
err = errNoSuchGroup
}
return err
}
// 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(ctx context.Context, objAPI ObjectLayer, pathPrefix string, dirs bool) <-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() {
defer close(ch)
marker := ""
for {
lo, err := objAPI.ListObjects(ctx,
minioMetaBucket, pathPrefix, marker, SlashSeparator, maxObjectList)
if err != nil {
select {
case ch <- itemOrErr{Err: err}:
case <-ctx.Done():
}
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 <-ctx.Done():
return
}
}
if !lo.IsTruncated {
return
}
}
}()
return ch
}
func (iamOS *IAMObjectStore) watch(ctx context.Context, sys *IAMSys) {
// Refresh IAMSys.
for {
select {
case <-ctx.Done():
return
case <-time.NewTimer(globalRefreshIAMInterval).C:
logger.LogIf(ctx, iamOS.loadAll(ctx, sys))
}
}
}