src/cypherpunks.ru/nncp/cmd/nncp-cfgenc/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2017 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 // NNCP configuration file encrypter/decrypter.
  20 package main
  21
  22 import (
  23         "bytes"
  24         "errors"
  25         "flag"
  26         "fmt"
  27         "io/ioutil"
  28         "log"
  29         "os"
  30
  31         "cypherpunks.ru/nncp"
  32         "github.com/davecgh/go-xdr/xdr2"
  33         "golang.org/x/crypto/blake2b"
  34         "golang.org/x/crypto/ssh/terminal"
  35 )
  36
  37 func usage() {
  38         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  39         fmt.Fprintln(os.Stderr, "nncp-cfgenc -- encrypt/decrypt configuration file\n")
  40         fmt.Fprintf(os.Stderr, "Usage: %s [options] cfg.yaml > cfg.yaml.eblob\n", os.Args[0])
  41         fmt.Fprintf(os.Stderr, "       %s [options] -d cfg.yaml.eblob > cfg.yaml\n", os.Args[0])
  42         fmt.Fprintf(os.Stderr, "       %s [options] -dump cfg.yaml.eblob\n", os.Args[0])
  43         fmt.Fprintln(os.Stderr, "Options:")
  44         flag.PrintDefaults()
  45 }
  46
  47 func main() {
  48         var (
  49                 decrypt  = flag.Bool("d", false, "Decrypt the file")
  50                 dump     = flag.Bool("dump", false, "Print human-readable eblob information")
  51                 sOpt     = flag.Int("s", nncp.DefaultS, "Balloon space cost, in 32 bytes chunks")
  52                 tOpt     = flag.Int("t", nncp.DefaultT, "Balloon time cost, number of rounds")
  53                 pOpt     = flag.Int("p", nncp.DefaultP, "Balloon number of parallel jobs")
  54                 version  = flag.Bool("version", false, "Print version information")
  55                 warranty = flag.Bool("warranty", false, "Print warranty information")
  56         )
  57         flag.Usage = usage
  58         flag.Parse()
  59         if *warranty {
  60                 fmt.Println(nncp.Warranty)
  61                 return
  62         }
  63         if *version {
  64                 fmt.Println(nncp.VersionGet())
  65                 return
  66         }
  67
  68         if flag.NArg() != 1 {
  69                 usage()
  70                 os.Exit(1)
  71         }
  72
  73         data, err := ioutil.ReadFile(flag.Arg(0))
  74         if err != nil {
  75                 log.Fatalln("Can not read data:", err)
  76         }
  77         if *dump {
  78                 var eblob nncp.EBlob
  79                 if _, err := xdr.Unmarshal(bytes.NewReader(data), &eblob); err != nil {
  80                         log.Fatalln(err)
  81                 }
  82                 if eblob.Magic != nncp.MagicNNCPBv1 {
  83                         log.Fatalln(errors.New("Unknown eblob type"))
  84                 }
  85                 fmt.Println("Strengthening function: Balloon with BLAKE2b-256")
  86                 fmt.Printf("Memory space cost: %d bytes\n", eblob.SCost*blake2b.Size256)
  87                 fmt.Printf("Number of rounds: %d\n", eblob.TCost)
  88                 fmt.Printf("Number of parallel jobs: %d\n", eblob.PCost)
  89                 fmt.Printf("Blob size: %d\n", len(eblob.Blob))
  90                 os.Exit(0)
  91         }
  92         if *decrypt {
  93                 os.Stderr.WriteString("Passphrase:")
  94                 password, err := terminal.ReadPassword(0)
  95                 if err != nil {
  96                         log.Fatalln(err)
  97                 }
  98                 os.Stderr.WriteString("\n")
  99                 cfgRaw, err := nncp.DeEBlob(data, password)
 100                 if err != nil {
 101                         log.Fatalln(err)
 102                 }
 103                 os.Stdout.Write(cfgRaw)
 104         } else {
 105                 os.Stderr.WriteString("Passphrase:")
 106                 password1, err := terminal.ReadPassword(0)
 107                 if err != nil {
 108                         log.Fatalln(err)
 109                 }
 110                 os.Stderr.WriteString("\n")
 111                 os.Stderr.WriteString("Repeat passphrase:")
 112                 password2, err := terminal.ReadPassword(0)
 113                 if err != nil {
 114                         log.Fatalln(err)
 115                 }
 116                 os.Stderr.WriteString("\n")
 117                 if bytes.Compare(password1, password2) != 0 {
 118                         log.Fatalln(errors.New("Passphrases do not match"))
 119                 }
 120                 eblob, err := nncp.NewEBlob(*sOpt, *tOpt, *pOpt, password1, data)
 121                 if err != nil {
 122                         log.Fatalln(err)
 123                 }
 124                 os.Stdout.Write(eblob)
 125         }
 126 }