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) 2016-2019 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, version 3 of the License.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 // NNCP configuration file encrypter/decrypter.
  19 package main
  20
  21 import (
  22         "bytes"
  23         "errors"
  24         "flag"
  25         "fmt"
  26         "io/ioutil"
  27         "log"
  28         "os"
  29
  30         "cypherpunks.ru/nncp"
  31         "github.com/davecgh/go-xdr/xdr2"
  32         "golang.org/x/crypto/blake2b"
  33         "golang.org/x/crypto/ssh/terminal"
  34 )
  35
  36 func usage() {
  37         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  38         fmt.Fprintf(os.Stderr, "nncp-cfgenc -- encrypt/decrypt configuration file\n\n")
  39         fmt.Fprintf(os.Stderr, "Usage: %s [options] cfg.yaml > cfg.yaml.eblob\n", os.Args[0])
  40         fmt.Fprintf(os.Stderr, "       %s [options] -d cfg.yaml.eblob > cfg.yaml\n", os.Args[0])
  41         fmt.Fprintf(os.Stderr, "       %s [options] -dump cfg.yaml.eblob\n", os.Args[0])
  42         fmt.Fprintln(os.Stderr, "Options:")
  43         flag.PrintDefaults()
  44 }
  45
  46 func main() {
  47         var (
  48                 decrypt  = flag.Bool("d", false, "Decrypt the file")
  49                 dump     = flag.Bool("dump", false, "Print human-readable eblob information")
  50                 sOpt     = flag.Int("s", nncp.DefaultS, "Balloon space cost, in 32 bytes chunks")
  51                 tOpt     = flag.Int("t", nncp.DefaultT, "Balloon time cost, number of rounds")
  52                 pOpt     = flag.Int("p", nncp.DefaultP, "Balloon number of parallel jobs")
  53                 version  = flag.Bool("version", false, "Print version information")
  54                 warranty = flag.Bool("warranty", false, "Print warranty information")
  55         )
  56         flag.Usage = usage
  57         flag.Parse()
  58         if *warranty {
  59                 fmt.Println(nncp.Warranty)
  60                 return
  61         }
  62         if *version {
  63                 fmt.Println(nncp.VersionGet())
  64                 return
  65         }
  66
  67         if flag.NArg() != 1 {
  68                 usage()
  69                 os.Exit(1)
  70         }
  71
  72         data, err := ioutil.ReadFile(flag.Arg(0))
  73         if err != nil {
  74                 log.Fatalln("Can not read data:", err)
  75         }
  76         if *dump {
  77                 var eblob nncp.EBlob
  78                 if _, err := xdr.Unmarshal(bytes.NewReader(data), &eblob); err != nil {
  79                         log.Fatalln(err)
  80                 }
  81                 if eblob.Magic != nncp.MagicNNCPBv3 {
  82                         log.Fatalln(errors.New("Unknown eblob type"))
  83                 }
  84                 fmt.Println("Strengthening function: Balloon with BLAKE2b-256")
  85                 fmt.Printf("Memory space cost: %d bytes\n", eblob.SCost*blake2b.Size256)
  86                 fmt.Printf("Number of rounds: %d\n", eblob.TCost)
  87                 fmt.Printf("Number of parallel jobs: %d\n", eblob.PCost)
  88                 fmt.Printf("Blob size: %d\n", len(eblob.Blob))
  89                 os.Exit(0)
  90         }
  91         if *decrypt {
  92                 os.Stderr.WriteString("Passphrase:")
  93                 password, err := terminal.ReadPassword(0)
  94                 if err != nil {
  95                         log.Fatalln(err)
  96                 }
  97                 os.Stderr.WriteString("\n")
  98                 cfgRaw, err := nncp.DeEBlob(data, password)
  99                 if err != nil {
 100                         log.Fatalln(err)
 101                 }
 102                 os.Stdout.Write(cfgRaw)
 103         } else {
 104                 os.Stderr.WriteString("Passphrase:")
 105                 password1, err := terminal.ReadPassword(0)
 106                 if err != nil {
 107                         log.Fatalln(err)
 108                 }
 109                 os.Stderr.WriteString("\n")
 110                 os.Stderr.WriteString("Repeat passphrase:")
 111                 password2, err := terminal.ReadPassword(0)
 112                 if err != nil {
 113                         log.Fatalln(err)
 114                 }
 115                 os.Stderr.WriteString("\n")
 116                 if bytes.Compare(password1, password2) != 0 {
 117                         log.Fatalln(errors.New("Passphrases do not match"))
 118                 }
 119                 eblob, err := nncp.NewEBlob(*sOpt, *tOpt, *pOpt, password1, data)
 120                 if err != nil {
 121                         log.Fatalln(err)
 122                 }
 123                 os.Stdout.Write(eblob)
 124         }
 125 }