mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-10-30 21:30:16 +00:00
127 lines
3.7 KiB
Go
127 lines
3.7 KiB
Go
/*
|
|
Copyright 2016 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 certificates
|
|
|
|
import (
|
|
"crypto/x509"
|
|
"encoding/pem"
|
|
"errors"
|
|
"fmt"
|
|
"reflect"
|
|
"strings"
|
|
|
|
"k8s.io/apimachinery/pkg/util/sets"
|
|
)
|
|
|
|
// ParseCSR extracts the CSR from the bytes and decodes it.
|
|
func ParseCSR(pemBytes []byte) (*x509.CertificateRequest, error) {
|
|
block, _ := pem.Decode(pemBytes)
|
|
if block == nil || block.Type != "CERTIFICATE REQUEST" {
|
|
return nil, errors.New("PEM block type must be CERTIFICATE REQUEST")
|
|
}
|
|
csr, err := x509.ParseCertificateRequest(block.Bytes)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return csr, nil
|
|
}
|
|
|
|
var (
|
|
organizationNotSystemNodesErr = fmt.Errorf("subject organization is not system:nodes")
|
|
commonNameNotSystemNode = fmt.Errorf("subject common name does not begin with system:node:")
|
|
dnsOrIPSANRequiredErr = fmt.Errorf("DNS or IP subjectAltName is required")
|
|
dnsSANNotAllowedErr = fmt.Errorf("DNS subjectAltNames are not allowed")
|
|
emailSANNotAllowedErr = fmt.Errorf("Email subjectAltNames are not allowed")
|
|
ipSANNotAllowedErr = fmt.Errorf("IP subjectAltNames are not allowed")
|
|
uriSANNotAllowedErr = fmt.Errorf("URI subjectAltNames are not allowed")
|
|
)
|
|
|
|
var kubeletServingRequiredUsages = sets.NewString(
|
|
string(UsageDigitalSignature),
|
|
string(UsageKeyEncipherment),
|
|
string(UsageServerAuth),
|
|
)
|
|
|
|
func IsKubeletServingCSR(req *x509.CertificateRequest, usages sets.String) bool {
|
|
return ValidateKubeletServingCSR(req, usages) == nil
|
|
}
|
|
func ValidateKubeletServingCSR(req *x509.CertificateRequest, usages sets.String) error {
|
|
if !reflect.DeepEqual([]string{"system:nodes"}, req.Subject.Organization) {
|
|
return organizationNotSystemNodesErr
|
|
}
|
|
|
|
// at least one of dnsNames or ipAddresses must be specified
|
|
if len(req.DNSNames) == 0 && len(req.IPAddresses) == 0 {
|
|
return dnsOrIPSANRequiredErr
|
|
}
|
|
|
|
if len(req.EmailAddresses) > 0 {
|
|
return emailSANNotAllowedErr
|
|
}
|
|
if len(req.URIs) > 0 {
|
|
return uriSANNotAllowedErr
|
|
}
|
|
|
|
if !kubeletServingRequiredUsages.Equal(usages) {
|
|
return fmt.Errorf("usages did not match %v", kubeletServingRequiredUsages.List())
|
|
}
|
|
|
|
if !strings.HasPrefix(req.Subject.CommonName, "system:node:") {
|
|
return commonNameNotSystemNode
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
var kubeletClientRequiredUsages = sets.NewString(
|
|
string(UsageDigitalSignature),
|
|
string(UsageKeyEncipherment),
|
|
string(UsageClientAuth),
|
|
)
|
|
|
|
func IsKubeletClientCSR(req *x509.CertificateRequest, usages sets.String) bool {
|
|
return ValidateKubeletClientCSR(req, usages) == nil
|
|
}
|
|
func ValidateKubeletClientCSR(req *x509.CertificateRequest, usages sets.String) error {
|
|
if !reflect.DeepEqual([]string{"system:nodes"}, req.Subject.Organization) {
|
|
return organizationNotSystemNodesErr
|
|
}
|
|
|
|
if len(req.DNSNames) > 0 {
|
|
return dnsSANNotAllowedErr
|
|
}
|
|
if len(req.EmailAddresses) > 0 {
|
|
return emailSANNotAllowedErr
|
|
}
|
|
if len(req.IPAddresses) > 0 {
|
|
return ipSANNotAllowedErr
|
|
}
|
|
if len(req.URIs) > 0 {
|
|
return uriSANNotAllowedErr
|
|
}
|
|
|
|
if !strings.HasPrefix(req.Subject.CommonName, "system:node:") {
|
|
return commonNameNotSystemNode
|
|
}
|
|
|
|
if !kubeletClientRequiredUsages.Equal(usages) {
|
|
return fmt.Errorf("usages did not match %v", kubeletClientRequiredUsages.List())
|
|
}
|
|
|
|
return nil
|
|
}
|