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keypair.go
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keypair.go
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/*
Copyright 2019 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 fitasks
import (
"crypto/x509/pkix"
"fmt"
"sort"
"strings"
"time"
"k8s.io/klog/v2"
"k8s.io/kops/pkg/pki"
"k8s.io/kops/upup/pkg/fi"
)
// +kops:fitask
type Keypair struct {
// Name is the name of the keypair
Name *string
// AlternateNames a list of alternative names for this certificate
AlternateNames []string `json:"alternateNames"`
// Lifecycle is context for a task
Lifecycle fi.Lifecycle
// Signer is the keypair to use to sign, for when we want to use an alternative CA
Signer *Keypair
// Subject is the certificate subject
Subject string `json:"subject"`
// Issuer is the certificate issuer, if not the same as the subject.
Issuer string `json:"issuer"`
// Type the type of certificate i.e. CA, server, client etc
Type string `json:"type"`
// LegacyFormat is whether the keypair is stored in a legacy format.
LegacyFormat bool `json:"oldFormat"`
certificates *fi.TaskDependentResource
keyset *fi.Keyset
}
var (
_ fi.HasCheckExisting = &Keypair{}
_ fi.HasName = &Keypair{}
)
// It's important always to check for the existing key, so we don't regenerate keys e.g. on terraform
func (e *Keypair) CheckExisting(c *fi.Context) bool {
return true
}
var _ fi.CompareWithID = &Keypair{}
func (e *Keypair) CompareWithID() *string {
return &e.Subject
}
func (e *Keypair) Find(c *fi.Context) (*Keypair, error) {
name := fi.StringValue(e.Name)
if name == "" {
return nil, nil
}
keyset, err := c.Keystore.FindKeyset(name)
if err != nil {
return nil, err
}
if keyset == nil || keyset.Primary == nil || keyset.Primary.Certificate == nil {
return nil, nil
}
cert := keyset.Primary.Certificate
if keyset.Primary.PrivateKey == nil {
return nil, fmt.Errorf("found cert in store, but did not find private key: %q", name)
}
var alternateNames []string
alternateNames = append(alternateNames, cert.Certificate.DNSNames...)
alternateNames = append(alternateNames, cert.Certificate.EmailAddresses...)
for _, ip := range cert.Certificate.IPAddresses {
alternateNames = append(alternateNames, ip.String())
}
sort.Strings(alternateNames)
actual := &Keypair{
Name: &name,
AlternateNames: alternateNames,
Subject: pki.PkixNameToString(&cert.Subject),
Issuer: pki.PkixNameToString(&cert.Certificate.Issuer),
Type: pki.BuildTypeDescription(cert.Certificate),
LegacyFormat: keyset.LegacyFormat,
}
actual.Signer = &Keypair{Subject: pki.PkixNameToString(&cert.Certificate.Issuer)}
// Avoid spurious changes
actual.Lifecycle = e.Lifecycle
if err := e.setResources(keyset); err != nil {
return nil, fmt.Errorf("error setting resources: %v", err)
}
return actual, nil
}
func (e *Keypair) Run(c *fi.Context) error {
err := e.normalize()
if err != nil {
return err
}
return fi.DefaultDeltaRunMethod(e, c)
}
func (e *Keypair) normalize() error {
var alternateNames []string
for _, s := range e.AlternateNames {
s = strings.TrimSpace(s)
if s == "" {
continue
}
alternateNames = append(alternateNames, s)
}
sort.Strings(alternateNames)
e.AlternateNames = alternateNames
if e.Signer != nil {
e.Issuer = e.Signer.Subject
}
return nil
}
func (_ *Keypair) CheckChanges(a, e, changes *Keypair) error {
if a != nil {
if changes.Name != nil {
return fi.CannotChangeField("Name")
}
}
return nil
}
func (_ *Keypair) ShouldCreate(a, e, changes *Keypair) (bool, error) {
// Don't reissue a CA just because the Subject or AlternateNames changed
if a != nil && e.Type == "ca" && changes.Type == "" && !a.LegacyFormat {
e.Subject = a.Subject
return false, nil
}
return true, nil
}
func (_ *Keypair) Render(c *fi.Context, a, e, changes *Keypair) error {
name := fi.StringValue(e.Name)
if name == "" {
return fi.RequiredField("Name")
}
changeStoredFormat := false
createCertificate := false
if a == nil {
createCertificate = true
klog.V(8).Infof("creating brand new certificate")
} else if changes != nil {
klog.V(8).Infof("creating certificate as changes are not nil")
if changes.AlternateNames != nil && e.Type != "ca" {
createCertificate = true
klog.V(8).Infof("creating certificate new AlternateNames")
} else if changes.Subject != "" && e.Type != "ca" {
createCertificate = true
klog.V(8).Infof("creating certificate new Subject")
} else if changes.Issuer != "" {
createCertificate = true
klog.V(8).Infof("creating certificate new Issuer")
} else if changes.Type != "" {
createCertificate = true
klog.Infof("creating certificate %q as Type has changed (actual=%v, expected=%v)", name, a.Type, e.Type)
} else if a.LegacyFormat {
changeStoredFormat = true
} else {
klog.Warningf("Ignoring changes in key: %v", fi.DebugAsJsonString(changes))
}
}
if createCertificate {
klog.V(2).Infof("Creating PKI keypair %q", name)
keyset, err := c.Keystore.FindKeyset(name)
if err != nil {
return err
}
if keyset == nil {
keyset = &fi.Keyset{
Items: map[string]*fi.KeysetItem{},
}
}
// We always reuse the private key if it exists,
// if we change keys we often have to regenerate e.g. the service accounts
// TODO: Eventually rotate keys / don't always reuse?
var privateKey *pki.PrivateKey
if keyset.Primary != nil {
privateKey = keyset.Primary.PrivateKey
}
if privateKey == nil {
klog.V(2).Infof("Creating privateKey %q", name)
}
signer := fi.CertificateIDCA
if e.Signer != nil {
signer = fi.StringValue(e.Signer.Name)
}
klog.Infof("Issuing new certificate: %q", *e.Name)
serial := pki.BuildPKISerial(time.Now().UnixNano())
subjectPkix, err := parsePkixName(e.Subject)
if err != nil {
return fmt.Errorf("error parsing Subject: %v", err)
}
if len(subjectPkix.ToRDNSequence()) == 0 {
return fmt.Errorf("subject name was empty for SSL keypair %q", *e.Name)
}
req := pki.IssueCertRequest{
Signer: signer,
Type: e.Type,
Subject: *subjectPkix,
AlternateNames: e.AlternateNames,
PrivateKey: privateKey,
Serial: serial,
}
cert, privateKey, _, err := pki.IssueCert(&req, c.Keystore)
if err != nil {
return err
}
serialString := cert.Certificate.SerialNumber.String()
ki := &fi.KeysetItem{
Id: serialString,
Certificate: cert,
PrivateKey: privateKey,
}
keyset.LegacyFormat = false
keyset.Items[ki.Id] = ki
keyset.Primary = ki
err = c.Keystore.StoreKeyset(name, keyset)
if err != nil {
return err
}
if err := e.setResources(keyset); err != nil {
return fmt.Errorf("error setting resources: %v", err)
}
// Make double-sure it round-trips
_, err = c.Keystore.FindKeyset(name)
if err != nil {
return err
}
klog.V(8).Infof("created certificate with cn=%s", cert.Subject.CommonName)
}
// TODO: Check correct subject / flags
if changeStoredFormat {
// We fetch and reinsert the same keypair, forcing an update to our preferred format
// TODO: We're assuming that we want to save in the preferred format
keyset, err := c.Keystore.FindKeyset(name)
if err != nil {
return err
}
keyset.LegacyFormat = false
err = c.Keystore.StoreKeyset(name, keyset)
if err != nil {
return err
}
klog.Infof("updated Keypair %q to new format", name)
}
return nil
}
func parsePkixName(s string) (*pkix.Name, error) {
name := new(pkix.Name)
tokens := strings.Split(s, ",")
for _, token := range tokens {
token = strings.TrimSpace(token)
kv := strings.SplitN(token, "=", 2)
if len(kv) != 2 {
return nil, fmt.Errorf("unrecognized token (expected k=v): %q", token)
}
k := strings.ToLower(kv[0])
v := kv[1]
switch k {
case "cn":
name.CommonName = v
case "o":
name.Organization = append(name.Organization, v)
default:
return nil, fmt.Errorf("unrecognized key %q in token %q", k, token)
}
}
return name, nil
}
func (e *Keypair) ensureResources() {
if e.certificates == nil {
e.certificates = &fi.TaskDependentResource{
Resource: fi.NewStringResource("<< TO BE GENERATED >>\n"),
Task: e,
}
e.keyset = &fi.Keyset{
Primary: &fi.KeysetItem{
Id: "<< TO BE GENERATED >>",
},
}
}
}
func (e *Keypair) setResources(keyset *fi.Keyset) error {
e.ensureResources()
s, err := keyset.ToCertificateBytes()
if err != nil {
return err
}
e.certificates.Resource = fi.NewBytesResource(s)
e.keyset = keyset
return nil
}
func (e *Keypair) Keyset() *fi.Keyset {
e.ensureResources()
return e.keyset
}
func (e *Keypair) Certificates() *fi.TaskDependentResource {
e.ensureResources()
return e.certificates
}