-
Notifications
You must be signed in to change notification settings - Fork 0
/
admission.go
162 lines (144 loc) · 4.45 KB
/
admission.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
package webhook
import (
"bytes"
"encoding/base64"
"encoding/json"
"fmt"
"github.com/grepplabs/spring-config-decryptor/pkg/decryptor"
"github.com/pkg/errors"
v1 "k8s.io/api/admission/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/klog/v2"
"strings"
)
type patchOperation struct {
Op string `json:"op"`
Path string `json:"path"`
Value string `json:"value"`
}
type patchOperations []patchOperation
func (ps *patchOperations) Replace(key string, value string) {
*ps = append(*ps, patchOperation{
Op: "replace",
Path: fmt.Sprintf("/data/%s", key),
Value: value,
})
}
type AdmissionReviewMutator struct {
configDecryptor decryptor.Decryptor
}
func NewAdmissionReviewMutator(configDecryptor decryptor.Decryptor) *AdmissionReviewMutator {
return &AdmissionReviewMutator{
configDecryptor: configDecryptor,
}
}
func (m AdmissionReviewMutator) admitConfigMaps(ar v1.AdmissionReview) *v1.AdmissionResponse {
klog.V(2).Infof("admitting configmap %s/%s", ar.Request.Namespace, ar.Request.Name)
configMapResource := metav1.GroupVersionResource{Group: "", Version: "v1", Resource: "configmaps"}
if ar.Request.Resource != configMapResource {
msg := fmt.Sprintf("expect resource to be %v, but is %v", configMapResource, ar.Request.Resource)
klog.Error(msg)
return toV1AdmissionResponse(errors.New(msg))
}
var raw []byte
if ar.Request.Operation == v1.Delete {
raw = ar.Request.OldObject.Raw
} else {
raw = ar.Request.Object.Raw
}
if ar.Request.Operation != v1.Create && ar.Request.Operation != v1.Update {
reviewResponse := v1.AdmissionResponse{}
reviewResponse.Allowed = true
return &reviewResponse
}
configmap := corev1.ConfigMap{}
deserializer := codecs.UniversalDeserializer()
if _, _, err := deserializer.Decode(raw, nil, &configmap); err != nil {
klog.Error(err)
return toV1AdmissionResponse(err)
}
reviewResponse := v1.AdmissionResponse{}
reviewResponse.Allowed = true
patches := patchOperations{}
for k, v := range configmap.Data {
var buf bytes.Buffer
err := m.configDecryptor.Decrypt(&buf, strings.NewReader(v))
if err != nil {
klog.Error(err)
return toV1AdmissionResponse(err)
}
vnew := buf.String()
if v != vnew {
patches.Replace(k, vnew)
}
}
if len(patches) != 0 {
b, err := json.Marshal(patches)
if err != nil {
klog.Error(err)
return toV1AdmissionResponse(err)
}
klog.Infof("patch configmap %s/%s", configmap.ObjectMeta.Namespace, configmap.ObjectMeta.Name)
klog.V(4).Infof("AdmissionResponse patch %s", string(b))
reviewResponse.Patch = b
pt := v1.PatchTypeJSONPatch
reviewResponse.PatchType = &pt
}
return &reviewResponse
}
func (m AdmissionReviewMutator) admitSecrets(ar v1.AdmissionReview) *v1.AdmissionResponse {
klog.V(2).Infof("admitting secret %s/%s", ar.Request.Namespace, ar.Request.Name)
secretResource := metav1.GroupVersionResource{Group: "", Version: "v1", Resource: "secrets"}
if ar.Request.Resource != secretResource {
msg := fmt.Sprintf("expect resource to be %v, but is %v", secretResource, ar.Request.Resource)
klog.Error(msg)
return toV1AdmissionResponse(errors.New(msg))
}
var raw []byte
if ar.Request.Operation == v1.Delete {
raw = ar.Request.OldObject.Raw
} else {
raw = ar.Request.Object.Raw
}
if ar.Request.Operation != v1.Create && ar.Request.Operation != v1.Update {
reviewResponse := v1.AdmissionResponse{}
reviewResponse.Allowed = true
return &reviewResponse
}
secret := corev1.Secret{}
deserializer := codecs.UniversalDeserializer()
if _, _, err := deserializer.Decode(raw, nil, &secret); err != nil {
klog.Error(err)
return toV1AdmissionResponse(err)
}
reviewResponse := v1.AdmissionResponse{}
reviewResponse.Allowed = true
patches := patchOperations{}
for k, v := range secret.Data {
var buf bytes.Buffer
err := m.configDecryptor.Decrypt(&buf, bytes.NewReader(v))
if err != nil {
klog.Error(err)
return toV1AdmissionResponse(err)
}
vnew := base64.StdEncoding.EncodeToString(buf.Bytes())
vold := base64.StdEncoding.EncodeToString(v)
if vold != vnew {
patches.Replace(k, vnew)
}
}
if len(patches) != 0 {
b, err := json.Marshal(patches)
if err != nil {
klog.Error(err)
return toV1AdmissionResponse(err)
}
klog.Infof("patch secret %s/%s", secret.ObjectMeta.Namespace, secret.ObjectMeta.Name)
klog.V(4).Infof("AdmissionResponse patch %s", string(b))
reviewResponse.Patch = b
pt := v1.PatchTypeJSONPatch
reviewResponse.PatchType = &pt
}
return &reviewResponse
}