create_server_cert.go

/*
Copyright AppsCode Inc.

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 cmds

import (
	"fmt"
	"net"
	"os"

	"github.com/spf13/cobra"
	"gomodules.xyz/blobfs"
	"gomodules.xyz/cert"
	"gomodules.xyz/cert/certstore"
	"k8s.io/klog/v2"
)

func NewCmdCreateServer(certDir string) *cobra.Command {
	var (
		org    []string
		prefix string
		sans   = cert.AltNames{
			IPs: []net.IP{net.ParseIP("127.0.0.1")},
		}
		overwrite bool
	)
	cmd := &cobra.Command{
		Use:               "server-cert",
		Short:             "Generate server certificate pair",
		DisableAutoGenTag: true,
		Run: func(cmd *cobra.Command, args []string) {
			if len(args) > 1 {
				klog.Fatalln("Multiple server name found.")
			}
			if len(args) == 0 {
				sans.DNSNames = merge("server", sans.DNSNames)
			} else if len(args) == 1 {
				sans.DNSNames = merge(args[0], sans.DNSNames)
			}

			cfg := cert.Config{
				AltNames: sans,
			}

			store := certstore.New(blobfs.New("file:///"), certDir, 0, org...)

			var p []string
			if prefix != "" {
				p = append(p, prefix)
			}
			if store.IsExists(Filename(cfg), p...) && !overwrite {
				fmt.Printf("Server certificate found at %s. Do you want to overwrite?", store.Location())
				os.Exit(1)
			}

			if err := store.LoadCA(p...); err != nil {
				fmt.Printf("CA certificates not found in %s. Run `init ca`", store.Location())
				os.Exit(1)
			}

			crt, key, err := store.NewServerCertPair(cfg.AltNames)
			if err != nil {
				fmt.Printf("Failed to generate server certificate pair. Reason: %v.", err)
				os.Exit(1)
			}
			err = store.Write(Filename(cfg), crt, key)
			if err != nil {
				fmt.Printf("Failed to init server certificate pair. Reason: %v.", err)
				os.Exit(1)
			}
			fmt.Println("Wrote server certificates in ", store.Location())
			os.Exit(0)
		},
	}

	cmd.Flags().StringVar(&certDir, "cert-dir", certDir, "Path to directory where pki files are stored.")
	cmd.Flags().IPSliceVar(&sans.IPs, "ips", sans.IPs, "Alternative IP addresses")
	cmd.Flags().StringSliceVar(&sans.DNSNames, "domains", sans.DNSNames, "Alternative Domain names")
	cmd.Flags().StringSliceVarP(&org, "organization", "o", org, "Name of client organizations.")
	cmd.Flags().StringVarP(&prefix, "prefix", "p", prefix, "Prefix added to certificate files")
	cmd.Flags().BoolVar(&overwrite, "overwrite", overwrite, "Overwrite existing cert/key pair")
	return cmd
}