server/helpers/peertube-crypto.js

   1 'use strict'
   2
   3 const crypto = require('crypto')
   4 const bcrypt = require('bcrypt')
   5 const fs = require('fs')
   6 const openssl = require('openssl-wrapper')
   7 const pathUtils = require('path')
   8
   9 const constants = require('../initializers/constants')
  10 const logger = require('./logger')
  11
  12 const peertubeCrypto = {
  13   checkSignature,
  14   comparePassword,
  15   createCertsIfNotExist,
  16   cryptPassword,
  17   getMyPrivateCert,
  18   getMyPublicCert,
  19   sign
  20 }
  21
  22 function checkSignature (publicKey, data, hexSignature) {
  23   const verify = crypto.createVerify(constants.SIGNATURE_ALGORITHM)
  24
  25   let dataString
  26   if (typeof data === 'string') {
  27     dataString = data
  28   } else {
  29     try {
  30       dataString = JSON.stringify(data)
  31     } catch (err) {
  32       logger.error('Cannot check signature.', { error: err })
  33       return false
  34     }
  35   }
  36
  37   verify.update(dataString, 'utf8')
  38
  39   const isValid = verify.verify(publicKey, hexSignature, constants.SIGNATURE_ENCODING)
  40   return isValid
  41 }
  42
  43 function sign (data) {
  44   const sign = crypto.createSign(constants.SIGNATURE_ALGORITHM)
  45
  46   let dataString
  47   if (typeof data === 'string') {
  48     dataString = data
  49   } else {
  50     try {
  51       dataString = JSON.stringify(data)
  52     } catch (err) {
  53       logger.error('Cannot sign data.', { error: err })
  54       return ''
  55     }
  56   }
  57
  58   sign.update(dataString, 'utf8')
  59
  60   // TODO: make async
  61   const certPath = pathUtils.join(constants.CONFIG.STORAGE.CERT_DIR, constants.PRIVATE_CERT_NAME)
  62   const myKey = fs.readFileSync(certPath)
  63   const signature = sign.sign(myKey, constants.SIGNATURE_ENCODING)
  64
  65   return signature
  66 }
  67
  68 function comparePassword (plainPassword, hashPassword, callback) {
  69   bcrypt.compare(plainPassword, hashPassword, function (err, isPasswordMatch) {
  70     if (err) return callback(err)
  71
  72     return callback(null, isPasswordMatch)
  73   })
  74 }
  75
  76 function createCertsIfNotExist (callback) {
  77   certsExist(function (err, exist) {
  78     if (err) return callback(err)
  79
  80     if (exist === true) {
  81       return callback(null)
  82     }
  83
  84     createCerts(function (err) {
  85       return callback(err)
  86     })
  87   })
  88 }
  89
  90 function cryptPassword (password, callback) {
  91   bcrypt.genSalt(constants.BCRYPT_SALT_SIZE, function (err, salt) {
  92     if (err) return callback(err)
  93
  94     bcrypt.hash(password, salt, function (err, hash) {
  95       return callback(err, hash)
  96     })
  97   })
  98 }
  99
 100 function getMyPrivateCert (callback) {
 101   const certPath = pathUtils.join(constants.CONFIG.STORAGE.CERT_DIR, constants.PRIVATE_CERT_NAME)
 102   fs.readFile(certPath, 'utf8', callback)
 103 }
 104
 105 function getMyPublicCert (callback) {
 106   const certPath = pathUtils.join(constants.CONFIG.STORAGE.CERT_DIR, constants.PUBLIC_CERT_NAME)
 107   fs.readFile(certPath, 'utf8', callback)
 108 }
 109
 110 // ---------------------------------------------------------------------------
 111
 112 module.exports = peertubeCrypto
 113
 114 // ---------------------------------------------------------------------------
 115
 116 function certsExist (callback) {
 117   const certPath = pathUtils.join(constants.CONFIG.STORAGE.CERT_DIR, constants.PRIVATE_CERT_NAME)
 118   fs.access(certPath, function (err) {
 119     // If there is an error the certificates do not exist
 120     const exists = !err
 121     return callback(null, exists)
 122   })
 123 }
 124
 125 function createCerts (callback) {
 126   certsExist(function (err, exist) {
 127     if (err) return callback(err)
 128
 129     if (exist === true) {
 130       const string = 'Certs already exist.'
 131       logger.warning(string)
 132       return callback(new Error(string))
 133     }
 134
 135     logger.info('Generating a RSA key...')
 136
 137     const privateCertPath = pathUtils.join(constants.CONFIG.STORAGE.CERT_DIR, constants.PRIVATE_CERT_NAME)
 138     const genRsaOptions = {
 139       'out': privateCertPath,
 140       '2048': false
 141     }
 142     openssl.exec('genrsa', genRsaOptions, function (err) {
 143       if (err) {
 144         logger.error('Cannot create private key on this pod.')
 145         return callback(err)
 146       }
 147
 148       logger.info('RSA key generated.')
 149       logger.info('Managing public key...')
 150
 151       const publicCertPath = pathUtils.join(constants.CONFIG.STORAGE.CERT_DIR, 'peertube.pub')
 152       const rsaOptions = {
 153         'in': privateCertPath,
 154         'pubout': true,
 155         'out': publicCertPath
 156       }
 157       openssl.exec('rsa', rsaOptions, function (err) {
 158         if (err) {
 159           logger.error('Cannot create public key on this pod.')
 160           return callback(err)
 161         }
 162
 163         logger.info('Public key managed.')
 164         return callback(null)
 165       })
 166     })
 167   })
 168 }