-
Notifications
You must be signed in to change notification settings - Fork 75
/
policy_rule_index.go
177 lines (156 loc) · 5.07 KB
/
policy_rule_index.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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
package accesscontrol
import (
"fmt"
"hash"
"sort"
v1 "github.com/rancher/wrangler/v2/pkg/generated/controllers/rbac/v1"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
)
const (
rbacGroup = "rbac.authorization.k8s.io"
All = "*"
)
type policyRuleIndex struct {
crCache v1.ClusterRoleCache
rCache v1.RoleCache
crbCache v1.ClusterRoleBindingCache
rbCache v1.RoleBindingCache
revisions *roleRevisionIndex
kind string
roleIndexKey string
clusterRoleIndexKey string
}
func newPolicyRuleIndex(user bool, revisions *roleRevisionIndex, rbac v1.Interface) *policyRuleIndex {
key := "Group"
if user {
key = "User"
}
pi := &policyRuleIndex{
kind: key,
crCache: rbac.ClusterRole().Cache(),
rCache: rbac.Role().Cache(),
crbCache: rbac.ClusterRoleBinding().Cache(),
rbCache: rbac.RoleBinding().Cache(),
clusterRoleIndexKey: "crb" + key,
roleIndexKey: "rb" + key,
revisions: revisions,
}
pi.crbCache.AddIndexer(pi.clusterRoleIndexKey, pi.clusterRoleBindingBySubjectIndexer)
pi.rbCache.AddIndexer(pi.roleIndexKey, pi.roleBindingBySubject)
return pi
}
func (p *policyRuleIndex) clusterRoleBindingBySubjectIndexer(crb *rbacv1.ClusterRoleBinding) (result []string, err error) {
for _, subject := range crb.Subjects {
if subject.APIGroup == rbacGroup && subject.Kind == p.kind && crb.RoleRef.Kind == "ClusterRole" {
result = append(result, subject.Name)
} else if subject.APIGroup == "" && p.kind == "User" && subject.Kind == "ServiceAccount" && subject.Namespace != "" && crb.RoleRef.Kind == "ClusterRole" {
// Index is for Users and this references a service account
result = append(result, fmt.Sprintf("serviceaccount:%s:%s", subject.Namespace, subject.Name))
}
}
return
}
func (p *policyRuleIndex) roleBindingBySubject(rb *rbacv1.RoleBinding) (result []string, err error) {
for _, subject := range rb.Subjects {
if subject.APIGroup == rbacGroup && subject.Kind == p.kind {
result = append(result, subject.Name)
} else if subject.APIGroup == "" && p.kind == "User" && subject.Kind == "ServiceAccount" && subject.Namespace != "" {
// Index is for Users and this references a service account
result = append(result, fmt.Sprintf("serviceaccount:%s:%s", subject.Namespace, subject.Name))
}
}
return
}
var null = []byte{'\x00'}
func (p *policyRuleIndex) addRolesToHash(digest hash.Hash, subjectName string) {
for _, crb := range p.getClusterRoleBindings(subjectName) {
digest.Write([]byte(crb.RoleRef.Name))
digest.Write([]byte(p.revisions.roleRevision("", crb.RoleRef.Name)))
digest.Write(null)
}
for _, rb := range p.getRoleBindings(subjectName) {
switch rb.RoleRef.Kind {
case "Role":
digest.Write([]byte(rb.RoleRef.Name))
digest.Write([]byte(rb.Namespace))
digest.Write([]byte(p.revisions.roleRevision(rb.Namespace, rb.RoleRef.Name)))
digest.Write(null)
case "ClusterRole":
digest.Write([]byte(rb.RoleRef.Name))
digest.Write([]byte(p.revisions.roleRevision("", rb.RoleRef.Name)))
digest.Write(null)
}
}
}
func (p *policyRuleIndex) get(subjectName string) *AccessSet {
result := &AccessSet{}
for _, binding := range p.getRoleBindings(subjectName) {
p.addAccess(result, binding.Namespace, binding.RoleRef)
}
for _, binding := range p.getClusterRoleBindings(subjectName) {
p.addAccess(result, All, binding.RoleRef)
}
return result
}
func (p *policyRuleIndex) addAccess(accessSet *AccessSet, namespace string, roleRef rbacv1.RoleRef) {
for _, rule := range p.getRules(namespace, roleRef) {
for _, group := range rule.APIGroups {
for _, resource := range rule.Resources {
names := rule.ResourceNames
if len(names) == 0 {
names = []string{All}
}
for _, resourceName := range names {
for _, verb := range rule.Verbs {
accessSet.Add(verb,
schema.GroupResource{
Group: group,
Resource: resource,
}, Access{
Namespace: namespace,
ResourceName: resourceName,
})
}
}
}
}
}
}
func (p *policyRuleIndex) getRules(namespace string, roleRef rbacv1.RoleRef) []rbacv1.PolicyRule {
switch roleRef.Kind {
case "ClusterRole":
role, err := p.crCache.Get(roleRef.Name)
if err != nil {
return nil
}
return role.Rules
case "Role":
role, err := p.rCache.Get(namespace, roleRef.Name)
if err != nil {
return nil
}
return role.Rules
}
return nil
}
func (p *policyRuleIndex) getClusterRoleBindings(subjectName string) []*rbacv1.ClusterRoleBinding {
result, err := p.crbCache.GetByIndex(p.clusterRoleIndexKey, subjectName)
if err != nil {
return nil
}
sort.Slice(result, func(i, j int) bool {
return result[i].Name < result[j].Name
})
return result
}
func (p *policyRuleIndex) getRoleBindings(subjectName string) []*rbacv1.RoleBinding {
result, err := p.rbCache.GetByIndex(p.roleIndexKey, subjectName)
if err != nil {
return nil
}
sort.Slice(result, func(i, j int) bool {
return string(result[i].UID) < string(result[j].UID)
})
return result
}