Concept: encrypt init command for SOPS bootstrap

Signed-off-by: Hidde Beydals <hello@hidde.co>

cmd/flux/encrypt.go

@@ -0,0 +1,39 @@
+/*
+Copyright 2021 The Flux 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 (
+	"github.com/spf13/cobra"
+)
+
+var encryptCmd = &cobra.Command{
+	Use:   "encrypt",
+	Short: "Encrypt secrets using SOPS",
+	Long:  "The encrypt sub-commands initialise and manage Secret encryption using SOPS.",
+}
+
+type encryptFlags struct {
+	export bool
+}
+
+var encryptArgs encryptFlags
+
+func init() {
+	encryptCmd.PersistentFlags().BoolVar(&encryptArgs.export, "export", false, "export in YAML format to stdout")
+
+	rootCmd.AddCommand(encryptCmd)
+}

cmd/flux/encrypt_init.go

@@ -0,0 +1,113 @@
+/*
+Copyright 2021 The Flux 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"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"filippo.io/age"
+	"github.com/fluxcd/flux2/internal/utils"
+	"github.com/go-git/go-git/v5"
+	"github.com/spf13/cobra"
+	corev1 "k8s.io/api/core/v1"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+var encryptInitCmd = &cobra.Command{
+	Use:   "init",
+	Short: "Init SOPS encryption with age identity",
+	Long:  "The encryption init command creates a new age identity and writes a .sops.yaml file to the current working directory.",
+	Example: `  # Init SOPS encryption with a new age identity
+  flux encryption init`,
+	RunE: encryptInitCmdRun,
+}
+
+func init() {
+	encryptCmd.AddCommand(encryptInitCmd)
+}
+
+func encryptInitCmdRun(cmd *cobra.Command, args []string) error {
+	// Confirm our current path is in a Git repository
+	path, err := os.Getwd()
+	if err != nil {
+		return err
+	}
+	if _, err := git.PlainOpen(path); err != nil {
+		if err == git.ErrRepositoryNotExists {
+			err = fmt.Errorf("'%s' is not in a Git repository", path)
+		}
+		return err
+	}
+
+	// Abort early if .sops.yaml already exists
+	sopsCfgPath := filepath.Join(path, ".sops.yaml")
+	if _, err := os.Stat(sopsCfgPath); err == nil || os.IsExist(err) {
+		return fmt.Errorf("'%s' already contains a .sops.yaml config", path)
+	}
+
+	// Generate a new identity
+	i, err := age.GenerateX25519Identity()
+	if err != nil {
+		return err
+	}
+	logger.Successf("Generated identity %s", i.Recipient().String())
+
+	// Attempt to configure identity in .sops.yaml
+	const sopsCfg = `creation_rules:
+  - path_regex: .*.yaml
+    encrypted_regex: ^(data|stringData)$
+    age: %s
+`
+	if err := ioutil.WriteFile(sopsCfgPath, []byte(fmt.Sprintf(sopsCfg, i.Recipient().String())), 0644); err != nil {
+		logger.Failuref("Failed to write recipient to .sops.yaml file")
+		return err
+	}
+	logger.Successf("Configured recipient in .sops.yaml file")
+
+	// Init client
+	ctx, cancel := context.WithTimeout(context.Background(), rootArgs.timeout)
+	defer cancel()
+	kubeClient, err := utils.KubeClient(rootArgs.kubeconfig, rootArgs.kubecontext)
+	if err != nil {
+		return err
+	}
+
+	// Create a secret
+	secret := &corev1.Secret{
+		ObjectMeta: v1.ObjectMeta{
+			Name:      "sops-age",
+			Namespace: rootArgs.namespace,
+		},
+		StringData: map[string]string{
+			"flux-auto.age": i.String(),
+		},
+	}
+	if err := kubeClient.Create(ctx, secret); err != nil {
+		return err
+	}
+	logger.Successf(`Secret '%s' with private key created`, secret.Name)
+
+	// TODO(hidde): lookup kustomize based on path ref? Do direct cluster mutation? (Preferably not!)
+	//  Feels something is missing in general to provide a user experience improving bridge between "die hard"
+	//  `--export` and "please do not do this" direct-apply-to-cluster.
+
+	return nil
+}

go.mod

@@ -3,6 +3,7 @@ module github.com/fluxcd/flux2
 go 1.16
 
 require (
+	filippo.io/age v1.0.0-rc.3
 	github.com/Masterminds/semver/v3 v3.1.0
 	github.com/cyphar/filepath-securejoin v0.2.2
 	github.com/fluxcd/go-git-providers v0.1.1

go.sum

@@ -24,6 +24,9 @@ cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiy
 cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
 cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+filippo.io/age v1.0.0-rc.3 h1:8JjuJ5ffGKDmC4SS0zoyQxZROZX75so768b7AjulKLw=
+filippo.io/age v1.0.0-rc.3/go.mod h1:UjINLBMeA60aGZkHCGsmDzKcaXoTTzpvrqQM+Vo3YHU=
+filippo.io/edwards25519 v1.0.0-beta.3/go.mod h1:X+pm78QAUPtFLi1z9PYIlS/bdDnvbCOGKtZ+ACWEf7o=
 github.com/Azure/azure-sdk-for-go v35.0.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
 github.com/Azure/azure-sdk-for-go v38.0.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
 github.com/Azure/azure-sdk-for-go v42.3.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
@@ -799,6 +802,7 @@ golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.0.0-20200220183623-bac4c82f6975/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
 golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
 golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
 golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b h1:7mWr3k41Qtv8XlltBkDkl8LoP3mpSgBW8BUoxtEdbXg=