/
gencmd.go
211 lines (190 loc) · 7.68 KB
/
gencmd.go
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package tls
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"github.com/gruntwork-io/go-commons/errors"
"github.com/gruntwork-io/kubergrunt/kubectl"
"github.com/gruntwork-io/kubergrunt/logging"
)
const (
kubernetesSecretPrivateKeyAlgorithmAnnotationKey = "gruntwork.io/private-key-algorithm"
kubernetesSecretFileNameBaseAnnotationKey = "gruntwork.io/filename-base"
kubernetesSecretSignedByAnnotationKey = "gruntwork.io/signed-by"
)
type KubernetesSecretOptions struct {
Name string
Namespace string
Labels map[string]string
Annotations map[string]string
}
// GenerateAndStoreAsK8SSecret will generate new TLS certificate key pairs and store them as Kubernetes Secret
// resources.
func GenerateAndStoreAsK8SSecret(
kubectlOptions *kubectl.KubectlOptions,
secretOptions KubernetesSecretOptions,
caSecretOptions KubernetesSecretOptions,
genCA bool,
filenameBase string,
tlsOptions TLSOptions,
dnsNames []string,
) error {
logger := logging.GetProjectLogger()
logger.Info("Generating certificate key pairs")
// Create a temp path to store the certificates
logger.Info("Creating a temporary directory as a workspace")
tlsPath, err := ioutil.TempDir("", "")
if err != nil {
logger.Errorf("Error creating temp directory to store certificate key pairs: %s", err)
return errors.WithStackTrace(err)
}
logger.Infof("Using %s as temp path for storing certificates", tlsPath)
defer func() {
logger.Infof("Cleaning up temp workspace %s", tlsPath)
os.RemoveAll(tlsPath)
}()
// Generate the certificate key pair
var keyPairPath CertificateKeyPairPath
caCertPath := ""
if genCA {
logger.Info("Requested CA key pair.")
keyPairPath, err = generateCAKeyPair(tlsPath, tlsOptions, filenameBase)
if err != nil {
return err
}
} else {
logger.Info("Requested signed TLS key pair.")
caKeyPairPath, caKeyPairAlgorithm, err := loadCAKeyPair(kubectlOptions, caSecretOptions, tlsPath)
if err != nil {
return err
}
caCertPath = caKeyPairPath.CertificatePath
keyPairPath, err = generateSignedTLSKeyPair(tlsPath, tlsOptions, caKeyPairPath, caKeyPairAlgorithm, filenameBase, dnsNames)
if err != nil {
return err
}
// Record which CA was used to sign the resource
caSignedByString := fmt.Sprintf("namespace=%s,name=%s", caSecretOptions.Namespace, caSecretOptions.Name)
secretOptions.Annotations[kubernetesSecretSignedByAnnotationKey] = caSignedByString
}
// Finally, store the certificate key pair into Kubernetes
// Augment annotation to indicate private key algorithm and filename base used to generate the cert
secretOptions.Annotations[kubernetesSecretPrivateKeyAlgorithmAnnotationKey] = tlsOptions.PrivateKeyAlgorithm
secretOptions.Annotations[kubernetesSecretFileNameBaseAnnotationKey] = filenameBase
return StoreCertificateKeyPairAsKubernetesSecret(
kubectlOptions,
secretOptions.Name,
secretOptions.Namespace,
secretOptions.Labels,
secretOptions.Annotations,
filenameBase,
keyPairPath,
caCertPath,
)
}
// generateCAKeyPair will issue a new CA TLS certificate key pair.
func generateCAKeyPair(tlsPath string, tlsOptions TLSOptions, filenameBase string) (CertificateKeyPairPath, error) {
logger := logging.GetProjectLogger()
logger.Info("Generating CA certificate key pairs and storing into temporary workspace")
caKeyPairPath, err := tlsOptions.GenerateAndStoreTLSCertificateKeyPair(
filenameBase,
tlsPath,
"", // TODO: support passworded key pairs
true,
nil,
nil,
nil,
)
if err == nil {
logger.Info("Successfully generated CA TLS certificate key pair and stored in temp workspace.")
} else {
logger.Errorf("Error generating CA TLS certificate key pair: %s", err)
}
return caKeyPairPath, err
}
// generateSignedTLSKeyPair will issue a new TLS certificate key pair, signed by the provided CA certificate key pair.
func generateSignedTLSKeyPair(
tlsPath string,
tlsOptions TLSOptions,
caKeyPairPath CertificateKeyPairPath,
caKeyPairAlgorithm string,
filenameBase string,
dnsNames []string,
) (CertificateKeyPairPath, error) {
logger := logging.GetProjectLogger()
logger.Info("Generating signed certificate key pairs from loaded CA and storing into temporary workspace")
logger.Info("Parsing CA key pair")
signingCertificate, err := LoadCertificate(caKeyPairPath.CertificatePath)
if err != nil {
logger.Errorf("Error parsing CA TLS certificate key pair: %s", err)
return CertificateKeyPairPath{}, err
}
var signingKey interface{}
switch caKeyPairAlgorithm {
case ECDSAAlgorithm:
signingKey, err = LoadECDSAPrivateKey(caKeyPairPath.PrivateKeyPath)
case RSAAlgorithm:
signingKey, err = LoadRSAPrivateKey(caKeyPairPath.PrivateKeyPath)
default:
logger.Errorf("Unknown CA key pair algorithm: %s", caKeyPairAlgorithm)
return CertificateKeyPairPath{}, errors.WithStackTrace(UnknownPrivateKeyAlgorithm{Algorithm: caKeyPairAlgorithm})
}
logger.Info("Successfully parsed CA key pair")
logger.Info("Generating new TLS certificate key pair, signed by CA key pair")
keyPairPath, err := tlsOptions.GenerateAndStoreTLSCertificateKeyPair(
filenameBase,
tlsPath,
"", // TODO: support passworded key pairs
false,
dnsNames,
signingCertificate,
signingKey,
)
if err == nil {
logger.Info("Successfully generated TLS certificate key pair and stored in temp workspace.")
} else {
logger.Errorf("Error generating TLS certificate key pair: %s", err)
}
return keyPairPath, err
}
// loadCAKeyPair loads the CA TLS certificate key pair from a Kubernetes Secret resource. This assumes the CA key pair
// was created using the `tls gen` command of kubergrunt, which imposes a structure to how the TLS certificate key pairs
// are stored in the Secret resource.
func loadCAKeyPair(kubectlOptions *kubectl.KubectlOptions, caSecretOptions KubernetesSecretOptions, tlsPath string) (CertificateKeyPairPath, string, error) {
logger := logging.GetProjectLogger()
logger.Infof("Loading CA key pair stored in kubernetes secret %s (namespace %s)", caSecretOptions.Name, caSecretOptions.Namespace)
secret, err := kubectl.GetSecret(kubectlOptions, caSecretOptions.Namespace, caSecretOptions.Name)
if err != nil {
logger.Errorf("Error reading Secret resource from Kubernetes: %s", err)
return CertificateKeyPairPath{}, "", err
}
logger.Info("Successfully read Secret resource from Kubernetes.")
// Now store the certificate key pairs on disk into a temporary location.
logger.Info("Loading data as CA key pair and storing in temporary workspace")
filenameBase := secret.Annotations[kubernetesSecretFileNameBaseAnnotationKey]
certPath := filepath.Join(tlsPath, "ca.crt")
if err := ioutil.WriteFile(certPath, secret.Data[fmt.Sprintf("%s.crt", filenameBase)], 0600); err != nil {
logger.Errorf("Error storing CA certificate (ca.crt): %s", err)
return CertificateKeyPairPath{}, "", errors.WithStackTrace(err)
}
privKeyPath := filepath.Join(tlsPath, "ca.pem")
if err := ioutil.WriteFile(privKeyPath, secret.Data[fmt.Sprintf("%s.pem", filenameBase)], 0600); err != nil {
logger.Errorf("Error storing CA private key (ca.pem): %s", err)
return CertificateKeyPairPath{}, "", errors.WithStackTrace(err)
}
pubKeyPath := filepath.Join(tlsPath, "ca.pub")
if err := ioutil.WriteFile(pubKeyPath, secret.Data[fmt.Sprintf("%s.pub", filenameBase)], 0600); err != nil {
logger.Errorf("Error storing CA public key (ca.pub): %s", err)
return CertificateKeyPairPath{}, "", errors.WithStackTrace(err)
}
logger.Info("Successfully loaded data as CA key pair and stored in temporary workspace")
algorithm := secret.Annotations[kubernetesSecretPrivateKeyAlgorithmAnnotationKey]
// Finally build and return the struct
keyPairPath := CertificateKeyPairPath{
CertificatePath: certPath,
PrivateKeyPath: privKeyPath,
PublicKeyPath: pubKeyPath,
}
return keyPairPath, algorithm, nil
}