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ssl.go
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ssl.go
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package ssl
import (
"fmt"
glog "log"
"time"
"github.com/SUSE/scf-secret-generator/model"
"github.com/SUSE/scf-secret-generator/util"
"github.com/cloudflare/cfssl/cli/genkey"
"github.com/cloudflare/cfssl/config"
"github.com/cloudflare/cfssl/csr"
"github.com/cloudflare/cfssl/helpers"
"github.com/cloudflare/cfssl/initca"
"github.com/cloudflare/cfssl/signer"
"github.com/cloudflare/cfssl/signer/local"
"k8s.io/api/core/v1"
)
const defaultCA = "cacert"
// CertInfo contains all the information required to generate an SSL cert
type CertInfo struct {
PrivateKeyName string // Name to associate with private key
CertificateName string // Name to associate with certificate
IsAuthority bool
SubjectNames []string
RoleName string
Certificate []byte
PrivateKey []byte
}
// RecordCertInfo record cert information for later generation
func RecordCertInfo(certInfo map[string]CertInfo, configVar *model.ConfigurationVariable) error {
if len(configVar.Generator.ID) == 0 {
return fmt.Errorf("Config variable `%s` has no ID value", configVar.Name)
}
if configVar.Generator.Type != model.GeneratorTypeCACertificate && configVar.Generator.Type != model.GeneratorTypeCertificate {
return fmt.Errorf("Config variable `%s` does not have a valid SSL generator type", configVar.Name)
}
info := certInfo[configVar.Generator.ID]
isAuthority := (configVar.Generator.Type == model.GeneratorTypeCACertificate)
if (len(info.CertificateName) > 0 || len(info.PrivateKeyName) > 0) && isAuthority != info.IsAuthority {
return fmt.Errorf("Inconsistent cert type (CA vs non-CA) between Cert and Key vars for id `%s`", configVar.Generator.ID)
}
info.IsAuthority = isAuthority
switch configVar.Generator.ValueType {
case model.ValueTypeCertificate:
if len(info.CertificateName) > 0 {
return fmt.Errorf("Multiple variables define certificate name for SSL id `%s`", configVar.Generator.ID)
}
info.CertificateName = util.ConvertNameToKey(configVar.Name)
case model.ValueTypePrivateKey:
if len(info.PrivateKeyName) > 0 {
return fmt.Errorf("Multiple variables define private key name for SSL id `%s`", configVar.Generator.ID)
}
info.PrivateKeyName = util.ConvertNameToKey(configVar.Name)
default:
return fmt.Errorf("Config variable `%s` has invalid value type `%s`", configVar.Name, configVar.Generator.ValueType)
}
if len(configVar.Generator.SubjectNames) > 0 {
if configVar.Generator.Type == model.GeneratorTypeCACertificate {
return fmt.Errorf("CA Cert or key for SSL id `%s` should not have subject names", configVar.Generator.ID)
}
if configVar.Generator.ValueType == model.ValueTypePrivateKey {
return fmt.Errorf("Private key for SSL id `%s` should not have subject names", configVar.Generator.ID)
}
info.SubjectNames = configVar.Generator.SubjectNames
}
if configVar.Generator.RoleName != "" {
if configVar.Generator.Type == model.GeneratorTypeCACertificate {
return fmt.Errorf("CA Cert or key for SSL id `%s` should not have a role name", configVar.Generator.ID)
}
if configVar.Generator.ValueType == model.ValueTypePrivateKey {
return fmt.Errorf("Private key for SSL id `%s` should not have a role name", configVar.Generator.ID)
}
info.RoleName = configVar.Generator.RoleName
}
certInfo[configVar.Generator.ID] = info
return nil
}
// GenerateCerts creates an SSL cert and private key
func GenerateCerts(certInfo map[string]CertInfo, namespace, clusterDomain string, expiration int, secrets *v1.Secret) error {
// generate all the CAs first because they are needed to sign the certs
for id, info := range certInfo {
if !info.IsAuthority {
continue
}
glog.Printf("- SSL CA: %s\n", id)
err := createCA(certInfo, secrets, id, expiration)
if err != nil {
return err
}
}
for id, info := range certInfo {
if info.IsAuthority {
continue
}
glog.Printf("- SSL CRT: %s (%s / %s)\n", id, info.CertificateName, info.PrivateKeyName)
if len(info.SubjectNames) == 0 && info.RoleName == "" {
glog.Printf("Warning: certificate %s has no names\n", info.CertificateName)
}
err := createCert(certInfo, namespace, clusterDomain, secrets, id, expiration)
if err != nil {
return err
}
}
return nil
}
func rsaKeyRequest() *csr.BasicKeyRequest {
return &csr.BasicKeyRequest{A: "rsa", S: 4096}
}
func createCA(certInfo map[string]CertInfo, secrets *v1.Secret, id string, expiration int) error {
var err error
info := certInfo[id]
if len(secrets.Data[info.PrivateKeyName]) > 0 && len(secrets.Data[info.CertificateName]) > 0 {
// fetch CA from secrets because we may need it to sign new certs
info.PrivateKey = secrets.Data[info.PrivateKeyName]
info.Certificate = secrets.Data[info.CertificateName]
certInfo[id] = info
return nil
}
req := &csr.CertificateRequest{
CA: &csr.CAConfig{Expiry: fmt.Sprintf("%dh", expiration*24)},
CN: "SCF CA",
KeyRequest: rsaKeyRequest(),
}
info.Certificate, _, info.PrivateKey, err = initca.New(req)
if err != nil {
return fmt.Errorf("Cannot create CA: %s", err)
}
secrets.Data[info.PrivateKeyName] = info.PrivateKey
secrets.Data[info.CertificateName] = info.Certificate
certInfo[id] = info
return nil
}
func addHost(req *csr.CertificateRequest, wildcard bool, name string) {
req.Hosts = append(req.Hosts, name)
if wildcard {
req.Hosts = append(req.Hosts, "*."+name)
}
}
func createCert(certInfo map[string]CertInfo, namespace, clusterDomain string, secrets *v1.Secret, id string, expiration int) error {
var err error
info := certInfo[id]
// Just one of the fields may be deleted by changes to the generator input.
// Need to generate a new cert if either is missing.
if len(secrets.Data[info.PrivateKeyName]) > 0 && len(secrets.Data[info.CertificateName]) > 0 {
return nil
}
// XXX Add support for multiple CAs
caInfo := certInfo[defaultCA]
if len(caInfo.PrivateKey) == 0 || len(caInfo.Certificate) == 0 {
return fmt.Errorf("CA %s not found", defaultCA)
}
req := &csr.CertificateRequest{KeyRequest: rsaKeyRequest()}
if info.RoleName != "" {
addHost(req, true, info.RoleName)
addHost(req, true, fmt.Sprintf("%s.%s.svc", info.RoleName, namespace))
addHost(req, true, fmt.Sprintf("%s.%s.svc.%s", info.RoleName, namespace, clusterDomain))
// Generate wildcard certs for stateful sets for self-clustering roles
// We do this instead of having a bunch of subject alt names so that the
// certs can work correctly if we scale the cluster post-deployment.
prefix := fmt.Sprintf("*.%s-set", info.RoleName)
addHost(req, false, prefix)
addHost(req, false, fmt.Sprintf("%s.%s.svc", prefix, namespace))
addHost(req, false, fmt.Sprintf("%s.%s.svc.%s", prefix, namespace, clusterDomain))
}
for _, name := range info.SubjectNames {
addHost(req, false, name)
}
if len(req.Hosts) == 0 {
req.Hosts = append(req.Hosts, info.CertificateName)
}
req.CN = req.Hosts[0]
var signingReq []byte
g := &csr.Generator{Validator: genkey.Validator}
signingReq, info.PrivateKey, err = g.ProcessRequest(req)
if err != nil {
return fmt.Errorf("Cannot generate cert: %s", err)
}
caCert, err := helpers.ParseCertificatePEM(caInfo.Certificate)
if err != nil {
return fmt.Errorf("Cannot parse CA cert: %s", err)
}
caKey, err := helpers.ParsePrivateKeyPEM(caInfo.PrivateKey)
if err != nil {
return fmt.Errorf("Cannot parse CA private key: %s", err)
}
signingProfile := &config.SigningProfile{
Usage: []string{"server auth", "client auth"},
Expiry: time.Duration(expiration*24) * time.Hour,
ExpiryString: fmt.Sprintf("%dh", expiration*24),
}
policy := &config.Signing{
Profiles: map[string]*config.SigningProfile{},
Default: signingProfile,
}
s, err := local.NewSigner(caKey, caCert, signer.DefaultSigAlgo(caKey), policy)
if err != nil {
return fmt.Errorf("Cannot create signer: %s", err)
}
info.Certificate, err = s.Sign(signer.SignRequest{Request: string(signingReq)})
if err != nil {
return fmt.Errorf("Failed to sign cert: %s", err)
}
if len(info.PrivateKeyName) == 0 {
return fmt.Errorf("Certificate %s created with empty private key name", id)
}
if len(info.PrivateKey) == 0 {
return fmt.Errorf("Certificate %s created with empty private key", id)
}
if len(info.CertificateName) == 0 {
return fmt.Errorf("Certificate %s created with empty certificate name", id)
}
if len(info.Certificate) == 0 {
return fmt.Errorf("Certificate %s created with empty certificate", id)
}
secrets.Data[info.PrivateKeyName] = info.PrivateKey
secrets.Data[info.CertificateName] = info.Certificate
certInfo[id] = info
return nil
}