server/helpers/peertube-crypto.js

   1 'use strict'
   2
   3 const bcrypt = require('bcrypt')
   4 const crypto = require('crypto')
   5 const fs = require('fs')
   6 const openssl = require('openssl-wrapper')
   7 const ursa = require('ursa')
   8
   9 const constants = require('../initializers/constants')
  10 const logger = require('./logger')
  11
  12 const algorithm = 'aes-256-ctr'
  13
  14 const peertubeCrypto = {
  15   checkSignature,
  16   comparePassword,
  17   createCertsIfNotExist,
  18   cryptPassword,
  19   decrypt,
  20   encrypt,
  21   sign
  22 }
  23
  24 function checkSignature (publicKey, rawData, hexSignature) {
  25   const crt = ursa.createPublicKey(publicKey)
  26   const isValid = crt.hashAndVerify('sha256', new Buffer(rawData).toString('hex'), hexSignature, 'hex')
  27   return isValid
  28 }
  29
  30 function comparePassword (plainPassword, hashPassword, callback) {
  31   bcrypt.compare(plainPassword, hashPassword, function (err, isPasswordMatch) {
  32     if (err) return callback(err)
  33
  34     return callback(null, isPasswordMatch)
  35   })
  36 }
  37
  38 function createCertsIfNotExist (callback) {
  39   certsExist(function (exist) {
  40     if (exist === true) {
  41       return callback(null)
  42     }
  43
  44     createCerts(function (err) {
  45       return callback(err)
  46     })
  47   })
  48 }
  49
  50 function cryptPassword (password, callback) {
  51   bcrypt.genSalt(constants.BCRYPT_SALT_SIZE, function (err, salt) {
  52     if (err) return callback(err)
  53
  54     bcrypt.hash(password, salt, function (err, hash) {
  55       return callback(err, hash)
  56     })
  57   })
  58 }
  59
  60 function decrypt (key, data, callback) {
  61   fs.readFile(constants.CONFIG.STORAGE.CERT_DIR + 'peertube.key.pem', function (err, file) {
  62     if (err) return callback(err)
  63
  64     const myPrivateKey = ursa.createPrivateKey(file)
  65     const decryptedKey = myPrivateKey.decrypt(key, 'hex', 'utf8')
  66     const decryptedData = symetricDecrypt(data, decryptedKey)
  67
  68     return callback(null, decryptedData)
  69   })
  70 }
  71
  72 function encrypt (publicKey, data, callback) {
  73   const crt = ursa.createPublicKey(publicKey)
  74
  75   symetricEncrypt(data, function (err, dataEncrypted) {
  76     if (err) return callback(err)
  77
  78     const key = crt.encrypt(dataEncrypted.password, 'utf8', 'hex')
  79     const encrypted = {
  80       data: dataEncrypted.crypted,
  81       key: key
  82     }
  83
  84     callback(null, encrypted)
  85   })
  86 }
  87
  88 function sign (data) {
  89   const myKey = ursa.createPrivateKey(fs.readFileSync(constants.CONFIG.STORAGE.CERT_DIR + 'peertube.key.pem'))
  90   const signature = myKey.hashAndSign('sha256', data, 'utf8', 'hex')
  91
  92   return signature
  93 }
  94
  95 // ---------------------------------------------------------------------------
  96
  97 module.exports = peertubeCrypto
  98
  99 // ---------------------------------------------------------------------------
 100
 101 function certsExist (callback) {
 102   fs.exists(constants.CONFIG.STORAGE.CERT_DIR + 'peertube.key.pem', function (exists) {
 103     return callback(exists)
 104   })
 105 }
 106
 107 function createCerts (callback) {
 108   certsExist(function (exist) {
 109     if (exist === true) {
 110       const string = 'Certs already exist.'
 111       logger.warning(string)
 112       return callback(new Error(string))
 113     }
 114
 115     logger.info('Generating a RSA key...')
 116
 117     let options = {
 118       'out': constants.CONFIG.STORAGE.CERT_DIR + 'peertube.key.pem',
 119       '2048': false
 120     }
 121     openssl.exec('genrsa', options, function (err) {
 122       if (err) {
 123         logger.error('Cannot create private key on this pod.')
 124         return callback(err)
 125       }
 126       logger.info('RSA key generated.')
 127
 128       options = {
 129         'in': constants.CONFIG.STORAGE.CERT_DIR + 'peertube.key.pem',
 130         'pubout': true,
 131         'out': constants.CONFIG.STORAGE.CERT_DIR + 'peertube.pub'
 132       }
 133       logger.info('Manage public key...')
 134       openssl.exec('rsa', options, function (err) {
 135         if (err) {
 136           logger.error('Cannot create public key on this pod.')
 137           return callback(err)
 138         }
 139
 140         logger.info('Public key managed.')
 141         return callback(null)
 142       })
 143     })
 144   })
 145 }
 146
 147 function generatePassword (callback) {
 148   crypto.randomBytes(32, function (err, buf) {
 149     if (err) return callback(err)
 150
 151     callback(null, buf.toString('utf8'))
 152   })
 153 }
 154
 155 function symetricDecrypt (text, password) {
 156   const decipher = crypto.createDecipher(algorithm, password)
 157   let dec = decipher.update(text, 'hex', 'utf8')
 158   dec += decipher.final('utf8')
 159   return dec
 160 }
 161
 162 function symetricEncrypt (text, callback) {
 163   generatePassword(function (err, password) {
 164     if (err) return callback(err)
 165
 166     const cipher = crypto.createCipher(algorithm, password)
 167     let crypted = cipher.update(text, 'utf8', 'hex')
 168     crypted += cipher.final('hex')
 169     callback(null, { crypted: crypted, password: password })
 170   })
 171 }