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|
package main
import (
"flag"
"fmt"
"os"
"os/exec"
"os/user"
"path/filepath"
"strings"
)
var options struct {
version bool
namespace string
keyfile string
sigfile string
}
var key_names = [...]string{
"id_ed25519",
"id_ecdsa",
"id_rsa",
"id_dsa",
"id_ed25519.pub",
"id_ecdsa.pub",
"id_rsa.pub",
"id_dsa.pub",
}
var usage = `
Make ssh-keygen -Y simpler
Usage: %s COMMAND OPTION
OPTIONS:
-h --help
--version
COMMANDS:
sign create signature
check check signature
HELP:
sign --help
check --help
EXAMPLES:
%s sign file.txt
%s check -s file.txt.sig < file.txt
cat file.txt | %s sign > file.txt.sig
cat file.txt | %s check -s file.txt.sig
# Sign multiple files
%s sign file1.txt file2.txt [...]
# Use another key for signing
%s sign -f ~/.ssh/id_rsa file.txt
# Use a public key. Private Key for signing then comes from ssh-agent
%s sign -f ~/.ssh/id_rsa.pub file.txt
`
var warning = `
Missing command or option!
%s --help
`
var Version string = "ssh-sig (ssh-tools) 1.9"
func printVersion() {
fmt.Printf("%s\n", strings.TrimSpace(Version))
}
func main() {
exeName := filepath.Base(os.Args[0])
usage = strings.ReplaceAll(usage, "%s", exeName)
warning = strings.ReplaceAll(warning, "%s", exeName)
// Exit early if there is no ssh-keygen
binary, err := exec.LookPath("ssh-keygen")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
// Find SSH Keyfiles of the current user
// Use the first we can find
usr, _ := user.Current()
homedir := usr.HomeDir
for _, key_name := range key_names {
key_file := filepath.Join(homedir, ".ssh", key_name)
if _, err := os.Stat(key_file); !os.IsNotExist(err) {
options.keyfile = key_file
break // use first keyfile we find
}
}
// Set of flags for subcommand sign
sign := flag.NewFlagSet("sign", flag.ExitOnError)
sign.StringVar(&options.namespace, "n", "file", "namespace")
sign.StringVar(&options.keyfile, "f", options.keyfile, "Private or Public SSH Key")
// Set of flags for subcommand check
check := flag.NewFlagSet("check", flag.ExitOnError)
check.StringVar(&options.sigfile, "s", "", "sigfile")
check.StringVar(&options.namespace, "n", "file", "namespace")
// Switch on subcommands, then apply the desired set of flags.
if len(os.Args) < 2 {
fmt.Fprintln(os.Stderr, warning)
os.Exit(0)
}
switch os.Args[1] {
case "--help", "-h":
fmt.Fprintf(flag.CommandLine.Output(), usage)
os.Exit(0)
case "--version":
printVersion()
os.Exit(0)
case "sign":
if err := sign.Parse(os.Args[2:]); err == nil {
args := []string{"-Y", "sign", "-n", options.namespace, "-f", options.keyfile}
for _, file := range sign.Args() {
args = append(args, file)
}
fmt.Fprintln(os.Stderr, "namespace :", options.namespace)
fmt.Fprintln(os.Stderr, "keyfile :", options.keyfile)
fmt.Fprintln(os.Stderr)
cmd := exec.Command(binary, args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Stdin = os.Stdin
execErr := cmd.Run()
if execErr != nil {
panic(execErr)
}
}
case "check":
if err := check.Parse(os.Args[2:]); err == nil {
args := []string{"-Y", "check-novalidate", "-n", options.namespace, "-s", options.sigfile}
fmt.Fprintln(os.Stderr, "namespace :", options.namespace)
fmt.Fprintln(os.Stderr, "sigfile :", options.sigfile)
fmt.Fprintln(os.Stderr)
cmd := exec.Command(binary, args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Stdin = os.Stdin
execErr := cmd.Run()
if execErr != nil {
panic(execErr)
}
}
default:
fmt.Fprintln(os.Stderr, warning)
os.Exit(0)
}
}
|
