-
Notifications
You must be signed in to change notification settings - Fork 9.9k
/
Copy pathrange_perm_cache.go
154 lines (131 loc) · 3.93 KB
/
range_perm_cache.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
// 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 (
"go.etcd.io/etcd/api/v3/authpb"
"go.etcd.io/etcd/pkg/v3/adt"
"go.uber.org/zap"
)
func getMergedPerms(tx AuthReadTx, userName string) *unifiedRangePermissions {
user := tx.UnsafeGetUser(userName)
if user == nil {
return nil
}
readPerms := adt.NewIntervalTree()
writePerms := adt.NewIntervalTree()
for _, roleName := range user.Roles {
role := tx.UnsafeGetRole(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(
lg *zap.Logger,
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:
lg.Panic("unknown auth type", zap.String("auth-type", permtyp.String()))
}
return false
}
func checkKeyPoint(lg *zap.Logger, 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:
lg.Panic("unknown auth type", zap.String("auth-type", permtyp.String()))
}
return false
}
func (as *authStore) isRangeOpPermitted(userName string, key, rangeEnd []byte, permtyp authpb.Permission_Type) bool {
// assumption: tx is Lock()ed
as.rangePermCacheMu.RLock()
defer as.rangePermCacheMu.RUnlock()
rangePerm, ok := as.rangePermCache[userName]
if !ok {
as.lg.Error(
"user doesn't exist",
zap.String("user-name", userName),
)
return false
}
if len(rangeEnd) == 0 {
return checkKeyPoint(as.lg, rangePerm, key, permtyp)
}
return checkKeyInterval(as.lg, rangePerm, key, rangeEnd, permtyp)
}
func (as *authStore) refreshRangePermCache(tx AuthReadTx) {
// Note that every authentication configuration update calls this method and it invalidates the entire
// rangePermCache and reconstruct it based on information of users and roles stored in the backend.
// This can be a costly operation.
as.rangePermCacheMu.Lock()
defer as.rangePermCacheMu.Unlock()
as.rangePermCache = make(map[string]*unifiedRangePermissions)
users := tx.UnsafeGetAllUsers()
for _, user := range users {
userName := string(user.Name)
perms := getMergedPerms(tx, userName)
if perms == nil {
as.lg.Error(
"failed to create a merged permission",
zap.String("user-name", userName),
)
continue
}
as.rangePermCache[userName] = perms
}
}
type unifiedRangePermissions struct {
readPerms adt.IntervalTree
writePerms adt.IntervalTree
}