228 lines
5.8 KiB
Go
228 lines
5.8 KiB
Go
// Copyright 2016 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package etcdserver
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import (
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"sync"
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"github.com/coreos/etcd/auth"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/lease"
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"github.com/coreos/etcd/mvcc"
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)
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type authApplierV3 struct {
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applierV3
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as auth.AuthStore
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lessor lease.Lessor
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// mu serializes Apply so that user isn't corrupted and so that
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// serialized requests don't leak data from TOCTOU errors
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mu sync.Mutex
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authInfo auth.AuthInfo
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}
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func newAuthApplierV3(as auth.AuthStore, base applierV3, lessor lease.Lessor) *authApplierV3 {
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return &authApplierV3{applierV3: base, as: as, lessor: lessor}
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}
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func (aa *authApplierV3) Apply(r *pb.InternalRaftRequest) *applyResult {
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aa.mu.Lock()
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defer aa.mu.Unlock()
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if r.Header != nil {
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// backward-compatible with pre-3.0 releases when internalRaftRequest
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// does not have header field
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aa.authInfo.Username = r.Header.Username
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aa.authInfo.Revision = r.Header.AuthRevision
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}
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if needAdminPermission(r) {
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if err := aa.as.IsAdminPermitted(&aa.authInfo); err != nil {
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aa.authInfo.Username = ""
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aa.authInfo.Revision = 0
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return &applyResult{err: err}
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}
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}
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ret := aa.applierV3.Apply(r)
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aa.authInfo.Username = ""
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aa.authInfo.Revision = 0
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return ret
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}
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func (aa *authApplierV3) Put(txn mvcc.TxnWrite, r *pb.PutRequest) (*pb.PutResponse, error) {
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if err := aa.as.IsPutPermitted(&aa.authInfo, r.Key); err != nil {
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return nil, err
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}
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if err := aa.checkLeasePuts(lease.LeaseID(r.Lease)); err != nil {
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// The specified lease is already attached with a key that cannot
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// be written by this user. It means the user cannot revoke the
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// lease so attaching the lease to the newly written key should
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// be forbidden.
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return nil, err
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}
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if r.PrevKv {
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err := aa.as.IsRangePermitted(&aa.authInfo, r.Key, nil)
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if err != nil {
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return nil, err
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}
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}
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return aa.applierV3.Put(txn, r)
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}
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func (aa *authApplierV3) Range(txn mvcc.TxnRead, r *pb.RangeRequest) (*pb.RangeResponse, error) {
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if err := aa.as.IsRangePermitted(&aa.authInfo, r.Key, r.RangeEnd); err != nil {
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return nil, err
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}
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return aa.applierV3.Range(txn, r)
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}
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func (aa *authApplierV3) DeleteRange(txn mvcc.TxnWrite, r *pb.DeleteRangeRequest) (*pb.DeleteRangeResponse, error) {
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if err := aa.as.IsDeleteRangePermitted(&aa.authInfo, r.Key, r.RangeEnd); err != nil {
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return nil, err
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}
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if r.PrevKv {
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err := aa.as.IsRangePermitted(&aa.authInfo, r.Key, r.RangeEnd)
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if err != nil {
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return nil, err
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}
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}
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return aa.applierV3.DeleteRange(txn, r)
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}
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func checkTxnReqsPermission(as auth.AuthStore, ai *auth.AuthInfo, reqs []*pb.RequestOp) error {
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for _, requ := range reqs {
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switch tv := requ.Request.(type) {
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case *pb.RequestOp_RequestRange:
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if tv.RequestRange == nil {
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continue
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}
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if err := as.IsRangePermitted(ai, tv.RequestRange.Key, tv.RequestRange.RangeEnd); err != nil {
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return err
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}
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case *pb.RequestOp_RequestPut:
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if tv.RequestPut == nil {
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continue
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}
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if err := as.IsPutPermitted(ai, tv.RequestPut.Key); err != nil {
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return err
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}
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case *pb.RequestOp_RequestDeleteRange:
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if tv.RequestDeleteRange == nil {
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continue
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}
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if tv.RequestDeleteRange.PrevKv {
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err := as.IsRangePermitted(ai, tv.RequestDeleteRange.Key, tv.RequestDeleteRange.RangeEnd)
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if err != nil {
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return err
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}
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}
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err := as.IsDeleteRangePermitted(ai, tv.RequestDeleteRange.Key, tv.RequestDeleteRange.RangeEnd)
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if err != nil {
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return err
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}
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}
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}
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return nil
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}
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func checkTxnAuth(as auth.AuthStore, ai *auth.AuthInfo, rt *pb.TxnRequest) error {
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for _, c := range rt.Compare {
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if err := as.IsRangePermitted(ai, c.Key, c.RangeEnd); err != nil {
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return err
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}
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}
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if err := checkTxnReqsPermission(as, ai, rt.Success); err != nil {
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return err
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}
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if err := checkTxnReqsPermission(as, ai, rt.Failure); err != nil {
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return err
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}
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return nil
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}
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func (aa *authApplierV3) Txn(rt *pb.TxnRequest) (*pb.TxnResponse, error) {
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if err := checkTxnAuth(aa.as, &aa.authInfo, rt); err != nil {
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return nil, err
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}
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return aa.applierV3.Txn(rt)
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}
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func (aa *authApplierV3) LeaseRevoke(lc *pb.LeaseRevokeRequest) (*pb.LeaseRevokeResponse, error) {
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if err := aa.checkLeasePuts(lease.LeaseID(lc.ID)); err != nil {
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return nil, err
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}
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return aa.applierV3.LeaseRevoke(lc)
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}
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func (aa *authApplierV3) checkLeasePuts(leaseID lease.LeaseID) error {
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lease := aa.lessor.Lookup(leaseID)
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if lease != nil {
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for _, key := range lease.Keys() {
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if err := aa.as.IsPutPermitted(&aa.authInfo, []byte(key)); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func needAdminPermission(r *pb.InternalRaftRequest) bool {
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switch {
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case r.AuthEnable != nil:
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return true
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case r.AuthDisable != nil:
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return true
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case r.AuthUserAdd != nil:
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return true
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case r.AuthUserDelete != nil:
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return true
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case r.AuthUserChangePassword != nil:
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return true
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case r.AuthUserGrantRole != nil:
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return true
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case r.AuthUserGet != nil:
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return true
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case r.AuthUserRevokeRole != nil:
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return true
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case r.AuthRoleAdd != nil:
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return true
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case r.AuthRoleGrantPermission != nil:
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return true
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case r.AuthRoleGet != nil:
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return true
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case r.AuthRoleRevokePermission != nil:
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return true
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case r.AuthRoleDelete != nil:
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return true
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case r.AuthUserList != nil:
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return true
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case r.AuthRoleList != nil:
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return true
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default:
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return false
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}
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}
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