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main_keysync.go
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/
main_keysync.go
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// Copyright 2020 k8s-enc-image-operator 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 main
import (
"context"
"flag"
"fmt"
"os"
"time"
"github.com/sirupsen/logrus"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
keyprotect "github.com/lumjjb/k8s-enc-image-operator/keyprotect"
"github.com/lumjjb/k8s-enc-image-operator/keysync"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
clientset "k8s.io/client-go/kubernetes"
)
const (
NamespaceEnv = "POD_NAMESPACE"
)
func main() {
inputFlags := struct {
kubeconfig string
interval uint
dir string
keyprotectConfigFile string
keyprotectConfigKubeSecret string
keyFilePermissions string
keyFileOwnership string
}{
kubeconfig: "",
interval: 10,
dir: "/tmp/keys",
keyprotectConfigFile: "",
keyprotectConfigKubeSecret: "",
keyFilePermissions: "0600",
keyFileOwnership: "",
}
flag.StringVar(&inputFlags.kubeconfig, "kubeconfig", inputFlags.kubeconfig,
"(optional) kubeconfig file to use, defaults to in-cluster config otherwise")
flag.UintVar(&inputFlags.interval, "interval", inputFlags.interval,
"(optional) interval to sync decryption keys (in seconds)")
flag.StringVar(&inputFlags.dir, "dir", inputFlags.dir,
"(optional) directory to sync keys to")
flag.StringVar(&inputFlags.keyprotectConfigFile, "keyprotectConfigFile", inputFlags.keyprotectConfigFile,
"(optional) config file for keyprotect enablement")
flag.StringVar(&inputFlags.keyprotectConfigKubeSecret, "keyprotectConfigKubeSecret", inputFlags.keyprotectConfigKubeSecret,
"(optional) kube secret name for config file for keyprotect enablement")
flag.StringVar(&inputFlags.keyFilePermissions, "keyFilePermissions", inputFlags.keyFilePermissions,
"(optional) permissions for the created key files (defaults to 0600)")
flag.StringVar(&inputFlags.keyFileOwnership, "keyFileOwnership", inputFlags.keyFileOwnership,
"(optional) ownership for the created key files (in UID:GID format; if not provided key files will be created with UID:GID of the process)")
flag.Parse()
config, err := clientcmd.BuildConfigFromFlags("", inputFlags.kubeconfig)
if err != nil {
panic(err)
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
panic(err)
}
var keyFilePermissions uint32
n, err := fmt.Sscanf(inputFlags.keyFilePermissions, "%o", &keyFilePermissions)
if err != nil || n != 1 {
panic("invalid permissions specified")
}
var keyFileOwnerUID, keyFileOwnerGID *int
if inputFlags.keyFileOwnership != "" {
keyFileOwnerUID, keyFileOwnerGID = new(int), new(int)
n, err = fmt.Sscanf(inputFlags.keyFileOwnership, "%d:%d", keyFileOwnerUID, keyFileOwnerGID)
if err != nil || n != 2 || *keyFileOwnerUID < 0 || *keyFileOwnerGID < 0 {
panic("invalid ownership specified")
}
}
namespace := os.Getenv(NamespaceEnv)
interval := time.Duration(inputFlags.interval) * time.Second
ksc := keysync.KeySyncServerConfig{
K8sClient: clientset,
Interval: interval,
KeySyncDir: inputFlags.dir,
Namespace: namespace,
KeyFilePermissions: os.FileMode(keyFilePermissions),
KeyFileOwnerUID: keyFileOwnerUID,
KeyFileOwnerGID: keyFileOwnerGID,
}
ks := keysync.NewKeySyncServer(ksc)
if inputFlags.keyprotectConfigFile != "" {
kpskh, err := keyprotect.GetSecKeyHandlerFromConfigFile(inputFlags.keyprotectConfigFile)
if err != nil {
panic(err)
}
ks.AddSecretKeyHandler("kp-key", kpskh)
} else if inputFlags.keyprotectConfigKubeSecret != "" {
go keyprotectConfigKubeSecretThread(clientset, namespace, inputFlags.keyprotectConfigKubeSecret, ks, interval)
/*
secClient := clientset.CoreV1().Secrets(namespace)
s, err := secClient.Get(inputFlags.keyprotectConfigKubeSecret, metav1.GetOptions{})
if err != nil {
panic(err)
}
if s.Data != nil {
d := s.Data["config.json"]
if len(d) > 0 {
kpskh, err := keyprotect.GetSecKeyHandlerFromConfig(d)
if err != nil {
panic(err)
}
ks.AddSecretKeyHandler("kp-key", kpskh)
}
}
*/
}
logrus.Printf("Starting KeySync server with sync-dir %v, interval %v s, namespace %v",
ksc.KeySyncDir,
ksc.Interval/time.Second,
ksc.Namespace)
logrus.Printf("Private key files will be persisted with %v permissions",
ksc.KeyFilePermissions)
if ksc.KeyFileOwnerUID != nil && ksc.KeyFileOwnerGID != nil {
logrus.Printf("Private key files will be persisted with %d:%d ownership (this might not work unless running as root or having CAP_CHOWN)",
*ksc.KeyFileOwnerUID,
*ksc.KeyFileOwnerGID)
}
if err := ks.Start(); err != nil {
logrus.Fatalf("KeySync failure: %v", err)
}
}
// keyprotectConfigKubeSecretThread is a helper function that tries to retrieve the kube secret containing the
// keyprotect config and add the handler to the key sync server. Meant to run as a thread.
func keyprotectConfigKubeSecretThread(clientset clientset.Interface, namespace string, secretName string, ks *keysync.KeySyncServer, interval time.Duration) {
first := true
oldData := ""
for {
if !first {
<-time.After(interval)
} else {
first = false
}
secClient := clientset.CoreV1().Secrets(namespace)
s, err := secClient.Get(context.Background(), secretName, metav1.GetOptions{})
if err != nil {
continue
}
if s.Data != nil {
d := s.Data["config.json"]
if len(d) > 0 {
if string(d) == oldData {
continue
}
oldData = string(d)
logrus.Printf("New keyprotect config detected in secrets, configuring...")
kpskh, err := keyprotect.GetSecKeyHandlerFromConfig(d)
if err != nil {
// log err
logrus.Errorf("Unable to parse keyprotect config: %v", err)
continue
}
ks.AddSecretKeyHandler("kp-key", kpskh)
}
}
}
}