/
validating-webhook.go
135 lines (117 loc) · 4.22 KB
/
validating-webhook.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
package admission
import (
"context"
"fmt"
"path/filepath"
"reflect"
policiesv1 "github.com/kubewarden/kubewarden-controller/pkg/apis/policies/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"sigs.k8s.io/controller-runtime/pkg/client"
admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"github.com/kubewarden/kubewarden-controller/internal/pkg/constants"
)
//+kubebuilder:rbac:groups=admissionregistration.k8s.io,resources=validatingwebhookconfigurations,verbs=get;list;watch;create;update;patch
func (r *Reconciler) ReconcileValidatingWebhookConfiguration(
ctx context.Context,
policy policiesv1.Policy,
admissionSecret *corev1.Secret,
policyServerNameWithPrefix string,
) error {
webhook := r.validatingWebhookConfiguration(policy, admissionSecret, policyServerNameWithPrefix)
err := r.Client.Create(ctx, webhook)
if err == nil {
return nil
}
if apierrors.IsAlreadyExists(err) {
return r.updateValidatingWebhook(ctx, policy, webhook)
}
return fmt.Errorf("cannot reconcile validating webhook: %w", err)
}
func (r *Reconciler) updateValidatingWebhook(ctx context.Context,
policy policiesv1.Policy,
newWebhook *admissionregistrationv1.ValidatingWebhookConfiguration,
) error {
var originalWebhook admissionregistrationv1.ValidatingWebhookConfiguration
err := r.Client.Get(ctx, client.ObjectKey{
Name: policy.GetUniqueName(),
}, &originalWebhook)
if err != nil && apierrors.IsNotFound(err) {
return fmt.Errorf("cannot retrieve validating webhook: %w", err)
}
patch := originalWebhook.DeepCopy()
if patch.ObjectMeta.Labels == nil {
patch.ObjectMeta.Labels = make(map[string]string)
}
for key, value := range newWebhook.ObjectMeta.Labels {
patch.ObjectMeta.Labels[key] = value
}
if patch.ObjectMeta.Annotations == nil {
patch.ObjectMeta.Annotations = make(map[string]string)
}
for key, value := range newWebhook.ObjectMeta.Annotations {
patch.ObjectMeta.Annotations[key] = value
}
if !reflect.DeepEqual(originalWebhook.Webhooks, newWebhook.Webhooks) {
patch.Webhooks = newWebhook.Webhooks
}
err = r.Client.Patch(ctx, patch, client.MergeFrom(&originalWebhook))
if err != nil {
return fmt.Errorf("cannot patch validating webhook: %w", err)
}
return nil
}
func (r *Reconciler) validatingWebhookConfiguration(
policy policiesv1.Policy,
admissionSecret *corev1.Secret,
policyServerName string,
) *admissionregistrationv1.ValidatingWebhookConfiguration {
admissionPath := filepath.Join("/validate", policy.GetUniqueName())
admissionPort := int32(constants.PolicyServerPort)
service := admissionregistrationv1.ServiceReference{
Namespace: r.DeploymentsNamespace,
Name: policyServerName,
Path: &admissionPath,
Port: &admissionPort,
}
sideEffects := policy.GetSideEffects()
if sideEffects == nil {
noneSideEffects := admissionregistrationv1.SideEffectClassNone
sideEffects = &noneSideEffects
}
policyScope := "namespace"
if policy.GetNamespace() == "" {
policyScope = "cluster"
}
return &admissionregistrationv1.ValidatingWebhookConfiguration{
ObjectMeta: metav1.ObjectMeta{
Name: policy.GetUniqueName(),
Labels: map[string]string{
"kubewarden": "true",
constants.WebhookConfigurationPolicyScopeLabelKey: policyScope,
},
Annotations: map[string]string{
constants.WebhookConfigurationPolicyNameAnnotationKey: policy.GetName(),
constants.WebhookConfigurationPolicyNamespaceAnnotationKey: policy.GetNamespace(),
},
},
Webhooks: []admissionregistrationv1.ValidatingWebhook{
{
Name: fmt.Sprintf("%s.kubewarden.admission", policy.GetUniqueName()),
ClientConfig: admissionregistrationv1.WebhookClientConfig{
Service: &service,
CABundle: admissionSecret.Data[constants.PolicyServerCARootPemName],
},
Rules: policy.GetRules(),
FailurePolicy: policy.GetFailurePolicy(),
MatchPolicy: policy.GetMatchPolicy(),
NamespaceSelector: policy.GetUpdatedNamespaceSelector(r.DeploymentsNamespace),
ObjectSelector: policy.GetObjectSelector(),
SideEffects: sideEffects,
TimeoutSeconds: policy.GetTimeoutSeconds(),
AdmissionReviewVersions: []string{"v1"},
},
},
}
}