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main.go
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main.go
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package main
import (
"crypto/rsa"
"errors"
goflag "flag"
"fmt"
"io"
"io/ioutil"
"os"
flag "github.com/spf13/pflag"
"k8s.io/apimachinery/pkg/runtime"
runtimeserializer "k8s.io/apimachinery/pkg/runtime/serializer"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/pkg/api"
"k8s.io/client-go/pkg/api/v1"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/cert"
ssv1alpha1 "github.com/bitnami/sealed-secrets/apis/v1alpha1"
// Register v1.Secret type
_ "k8s.io/client-go/pkg/api/install"
)
var (
// TODO: Verify k8s server signature against cert in kube client config.
certFile = flag.String("cert", "", "Certificate / public key to use for encryption. Overrides --controller-*")
controllerNs = flag.String("controller-namespace", api.NamespaceSystem, "Namespace of sealed-secrets controller.")
controllerName = flag.String("controller-name", "sealed-secrets-controller", "Name of sealed-secrets controller.")
clientConfig clientcmd.ClientConfig
)
func init() {
// The "usual" clientcmd/kubectl flags
loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
loadingRules.DefaultClientConfig = &clientcmd.DefaultClientConfig
overrides := clientcmd.ConfigOverrides{}
kflags := clientcmd.RecommendedConfigOverrideFlags("")
flag.StringVar(&loadingRules.ExplicitPath, "kubeconfig", "", "Path to a kube config. Only required if out-of-cluster")
clientcmd.BindOverrideFlags(&overrides, flag.CommandLine, kflags)
clientConfig = clientcmd.NewInteractiveDeferredLoadingClientConfig(loadingRules, &overrides, os.Stdin)
// Standard goflags (glog in particular)
flag.CommandLine.AddGoFlagSet(goflag.CommandLine)
}
func parseKey(r io.Reader) (*rsa.PublicKey, error) {
data, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
certs, err := cert.ParseCertsPEM(data)
if err != nil {
return nil, err
}
// ParseCertsPem returns error if len(certs) == 0, but best to be sure...
if len(certs) == 0 {
return nil, errors.New("Failed to read any certificates")
}
cert, ok := certs[0].PublicKey.(*rsa.PublicKey)
if !ok {
return nil, fmt.Errorf("Expected RSA public key but found %v", certs[0].PublicKey)
}
return cert, nil
}
func readSecret(codec runtime.Decoder, r io.Reader) (*v1.Secret, error) {
data, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
var ret v1.Secret
if err = runtime.DecodeInto(codec, data, &ret); err != nil {
return nil, err
}
return &ret, nil
}
func prettyEncoder(codecs runtimeserializer.CodecFactory, mediaType string, gv runtime.GroupVersioner) (runtime.Encoder, error) {
info, ok := runtime.SerializerInfoForMediaType(codecs.SupportedMediaTypes(), mediaType)
if !ok {
return nil, fmt.Errorf("binary can't serialize %s", mediaType)
}
prettyEncoder := info.PrettySerializer
if prettyEncoder == nil {
prettyEncoder = info.Serializer
}
enc := codecs.EncoderForVersion(prettyEncoder, gv)
return enc, nil
}
func openCertFile(certFile string) (io.ReadCloser, error) {
f, err := os.Open(certFile)
if err != nil {
return nil, fmt.Errorf("Error reading %s: %v", certFile, err)
}
return f, nil
}
func openCertHTTP(c corev1.CoreV1Interface, namespace, name string) (io.ReadCloser, error) {
f, err := c.
Services(namespace).
ProxyGet("http", name, "", "/v1/cert.pem", nil).
Stream()
if err != nil {
return nil, fmt.Errorf("Error fetching certificate: %v", err)
}
return f, nil
}
func openCert() (io.ReadCloser, error) {
if *certFile != "" {
return openCertFile(*certFile)
}
conf, err := clientConfig.ClientConfig()
if err != nil {
return nil, err
}
conf.AcceptContentTypes = "application/x-pem-file, */*"
restClient, err := corev1.NewForConfig(conf)
if err != nil {
return nil, err
}
return openCertHTTP(restClient, *controllerNs, *controllerName)
}
func seal(in io.Reader, out io.Writer, codecs runtimeserializer.CodecFactory, pubKey *rsa.PublicKey) error {
secret, err := readSecret(codecs.UniversalDecoder(), in)
if err != nil {
return err
}
if secret.GetNamespace() == "" {
ns, _, err := clientConfig.Namespace()
if err != nil {
return err
}
secret.SetNamespace(ns)
}
ssecret, err := ssv1alpha1.NewSealedSecret(codecs, pubKey, secret)
if err != nil {
return err
}
prettyEnc, err := prettyEncoder(codecs, runtime.ContentTypeJSON, ssv1alpha1.SchemeGroupVersion)
if err != nil {
return err
}
buf, err := runtime.Encode(prettyEnc, ssecret)
if err != nil {
return err
}
out.Write(buf)
fmt.Fprint(out, "\n")
return nil
}
func main() {
flag.Parse()
goflag.CommandLine.Parse([]string{})
f, err := openCert()
if err != nil {
panic(err.Error())
}
defer f.Close()
pubKey, err := parseKey(f)
if err != nil {
panic(err.Error())
}
if err := seal(os.Stdin, os.Stdout, api.Codecs, pubKey); err != nil {
panic(err.Error())
}
}