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// Copyright 2016 The etcd Authors
//
// 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 auth
import (
"github.com/coreos/etcd/auth/authpb"
"github.com/coreos/etcd/mvcc/backend"
"github.com/coreos/etcd/pkg/adt"
)
func getMergedPerms(tx backend.BatchTx, userName string) *unifiedRangePermissions {
user := getUser(tx, userName)
if user == nil {
plog.Errorf("invalid user name %s", userName)
return nil
}
readPerms := &adt.IntervalTree{}
writePerms := &adt.IntervalTree{}
for _, roleName := range user.Roles {
role := getRole(tx, roleName)
if role == nil {
continue
}
for _, perm := range role.KeyPermission {
var ivl adt.Interval
var rangeEnd []byte
if len(perm.RangeEnd) != 1 || perm.RangeEnd[0] != 0 {
rangeEnd = perm.RangeEnd
}
if len(perm.RangeEnd) != 0 {
ivl = adt.NewBytesAffineInterval(perm.Key, rangeEnd)
} else {
ivl = adt.NewBytesAffinePoint(perm.Key)
}
switch perm.PermType {
case authpb.READWRITE:
readPerms.Insert(ivl, struct{}{})
writePerms.Insert(ivl, struct{}{})
case authpb.READ:
readPerms.Insert(ivl, struct{}{})
case authpb.WRITE:
writePerms.Insert(ivl, struct{}{})
}
}
}
return &unifiedRangePermissions{
readPerms: readPerms,
writePerms: writePerms,
}
}
func checkKeyInterval(cachedPerms *unifiedRangePermissions, key, rangeEnd []byte, permtyp authpb.Permission_Type) bool {
if len(rangeEnd) == 1 && rangeEnd[0] == 0 {
rangeEnd = nil
}
ivl := adt.NewBytesAffineInterval(key, rangeEnd)
switch permtyp {
case authpb.READ:
return cachedPerms.readPerms.Contains(ivl)
case authpb.WRITE:
return cachedPerms.writePerms.Contains(ivl)
default:
plog.Panicf("unknown auth type: %v", permtyp)
}
return false
}
func checkKeyPoint(cachedPerms *unifiedRangePermissions, key []byte, permtyp authpb.Permission_Type) bool {
pt := adt.NewBytesAffinePoint(key)
switch permtyp {
case authpb.READ:
return cachedPerms.readPerms.Intersects(pt)
case authpb.WRITE:
return cachedPerms.writePerms.Intersects(pt)
default:
plog.Panicf("unknown auth type: %v", permtyp)
}
return false
}
func (as *authStore) isRangeOpPermitted(tx backend.BatchTx, userName string, key, rangeEnd []byte, permtyp authpb.Permission_Type) bool {
// assumption: tx is Lock()ed
_, ok := as.rangePermCache[userName]
if !ok {
perms := getMergedPerms(tx, userName)
if perms == nil {
plog.Errorf("failed to create a unified permission of user %s", userName)
return false
}
as.rangePermCache[userName] = perms
}
if len(rangeEnd) == 0 {
return checkKeyPoint(as.rangePermCache[userName], key, permtyp)
}
return checkKeyInterval(as.rangePermCache[userName], key, rangeEnd, permtyp)
}
func (as *authStore) clearCachedPerm() {
as.rangePermCache = make(map[string]*unifiedRangePermissions)
}
func (as *authStore) invalidateCachedPerm(userName string) {
delete(as.rangePermCache, userName)
}
type unifiedRangePermissions struct {
readPerms *adt.IntervalTree
writePerms *adt.IntervalTree
}
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