forked from k3s-io/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
rbac.go
128 lines (106 loc) · 4.51 KB
/
rbac.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
/*
Copyright 2018 The Kubernetes 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 rbac
import (
rbacv1 "k8s.io/api/rbac/v1"
"reflect"
"strings"
)
type simpleResource struct {
Group string
Resource string
ResourceNameExist bool
ResourceName string
}
// CompactRules combines rules that contain a single APIGroup/Resource, differ only by verb, and contain no other attributes.
// this is a fast check, and works well with the decomposed "missing rules" list from a Covers check.
func CompactRules(rules []rbacv1.PolicyRule) ([]rbacv1.PolicyRule, error) {
compacted := make([]rbacv1.PolicyRule, 0, len(rules))
simpleRules := map[simpleResource]*rbacv1.PolicyRule{}
for _, rule := range rules {
if resource, isSimple := isSimpleResourceRule(&rule); isSimple {
if existingRule, ok := simpleRules[resource]; ok {
// Add the new verbs to the existing simple resource rule
if existingRule.Verbs == nil {
existingRule.Verbs = []string{}
}
existingRule.Verbs = append(existingRule.Verbs, rule.Verbs...)
} else {
// Copy the rule to accumulate matching simple resource rules into
simpleRules[resource] = rule.DeepCopy()
}
} else {
compacted = append(compacted, rule)
}
}
// Once we've consolidated the simple resource rules, add them to the compacted list
for _, simpleRule := range simpleRules {
compacted = append(compacted, *simpleRule)
}
return compacted, nil
}
// isSimpleResourceRule returns true if the given rule contains verbs, a single resource, a single API group, at most one Resource Name, and no other values
func isSimpleResourceRule(rule *rbacv1.PolicyRule) (simpleResource, bool) {
resource := simpleResource{}
// If we have "complex" rule attributes, return early without allocations or expensive comparisons
if len(rule.ResourceNames) > 1 || len(rule.NonResourceURLs) > 0 {
return resource, false
}
// If we have multiple api groups or resources, return early
if len(rule.APIGroups) != 1 || len(rule.Resources) != 1 {
return resource, false
}
// Test if this rule only contains APIGroups/Resources/Verbs/ResourceNames
simpleRule := &rbacv1.PolicyRule{APIGroups: rule.APIGroups, Resources: rule.Resources, Verbs: rule.Verbs, ResourceNames: rule.ResourceNames}
if !reflect.DeepEqual(simpleRule, rule) {
return resource, false
}
if len(rule.ResourceNames) == 0 {
resource = simpleResource{Group: rule.APIGroups[0], Resource: rule.Resources[0], ResourceNameExist: false}
} else {
resource = simpleResource{Group: rule.APIGroups[0], Resource: rule.Resources[0], ResourceNameExist: true, ResourceName: rule.ResourceNames[0]}
}
return resource, true
}
// BreakdownRule takes a rule and builds an equivalent list of rules that each have at most one verb, one
// resource, and one resource name
func BreakdownRule(rule rbacv1.PolicyRule) []rbacv1.PolicyRule {
subrules := []rbacv1.PolicyRule{}
for _, group := range rule.APIGroups {
for _, resource := range rule.Resources {
for _, verb := range rule.Verbs {
if len(rule.ResourceNames) > 0 {
for _, resourceName := range rule.ResourceNames {
subrules = append(subrules, rbacv1.PolicyRule{APIGroups: []string{group}, Resources: []string{resource}, Verbs: []string{verb}, ResourceNames: []string{resourceName}})
}
} else {
subrules = append(subrules, rbacv1.PolicyRule{APIGroups: []string{group}, Resources: []string{resource}, Verbs: []string{verb}})
}
}
}
}
// Non-resource URLs are unique because they only combine with verbs.
for _, nonResourceURL := range rule.NonResourceURLs {
for _, verb := range rule.Verbs {
subrules = append(subrules, rbacv1.PolicyRule{NonResourceURLs: []string{nonResourceURL}, Verbs: []string{verb}})
}
}
return subrules
}
// SortableRuleSlice is used to sort rule slice
type SortableRuleSlice []rbacv1.PolicyRule
func (s SortableRuleSlice) Len() int { return len(s) }
func (s SortableRuleSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s SortableRuleSlice) Less(i, j int) bool {
return strings.Compare(s[i].String(), s[j].String()) < 0
}