server/helpers/peertube-crypto.ts

   1 import { Request } from 'express'
   2 import { BCRYPT_SALT_SIZE, HTTP_SIGNATURE, PRIVATE_RSA_KEY_SIZE } from '../initializers/constants'
   3 import { createPrivateKey, getPublicKey, promisify1, promisify2, sha256 } from './core-utils'
   4 import { jsonld } from './custom-jsonld-signature'
   5 import { logger } from './logger'
   6 import { cloneDeep } from 'lodash'
   7 import { createSign, createVerify } from 'crypto'
   8 import * as bcrypt from 'bcrypt'
   9 import { MActor } from '../typings/models'
  10
  11 const bcryptComparePromise = promisify2<any, string, boolean>(bcrypt.compare)
  12 const bcryptGenSaltPromise = promisify1<number, string>(bcrypt.genSalt)
  13 const bcryptHashPromise = promisify2<any, string | number, string>(bcrypt.hash)
  14
  15 const httpSignature = require('http-signature')
  16
  17 async function createPrivateAndPublicKeys () {
  18   logger.info('Generating a RSA key...')
  19
  20   const { key } = await createPrivateKey(PRIVATE_RSA_KEY_SIZE)
  21   const { publicKey } = await getPublicKey(key)
  22
  23   return { privateKey: key, publicKey }
  24 }
  25
  26 // User password checks
  27
  28 function comparePassword (plainPassword: string, hashPassword: string) {
  29   return bcryptComparePromise(plainPassword, hashPassword)
  30 }
  31
  32 async function cryptPassword (password: string) {
  33   const salt = await bcryptGenSaltPromise(BCRYPT_SALT_SIZE)
  34
  35   return bcryptHashPromise(password, salt)
  36 }
  37
  38 // HTTP Signature
  39
  40 function isHTTPSignatureDigestValid (rawBody: Buffer, req: Request): boolean {
  41   if (req.headers[HTTP_SIGNATURE.HEADER_NAME] && req.headers['digest']) {
  42     return buildDigest(rawBody.toString()) === req.headers['digest']
  43   }
  44
  45   return true
  46 }
  47
  48 function isHTTPSignatureVerified (httpSignatureParsed: any, actor: MActor): boolean {
  49   return httpSignature.verifySignature(httpSignatureParsed, actor.publicKey) === true
  50 }
  51
  52 function parseHTTPSignature (req: Request, clockSkew?: number) {
  53   return httpSignature.parse(req, { clockSkew })
  54 }
  55
  56 // JSONLD
  57
  58 function isJsonLDSignatureVerified (fromActor: MActor, signedDocument: any): Promise<boolean> {
  59   if (signedDocument.signature.type === 'RsaSignature2017') {
  60     return isJsonLDRSA2017Verified(fromActor, signedDocument)
  61   }
  62
  63   logger.warn('Unknown JSON LD signature %s.', signedDocument.signature.type, signedDocument)
  64
  65   return Promise.resolve(false)
  66 }
  67
  68 // Backward compatibility with "other" implementations
  69 async function isJsonLDRSA2017Verified (fromActor: MActor, signedDocument: any) {
  70   const [ documentHash, optionsHash ] = await Promise.all([
  71     createDocWithoutSignatureHash(signedDocument),
  72     createSignatureHash(signedDocument.signature)
  73   ])
  74
  75   const toVerify = optionsHash + documentHash
  76
  77   const verify = createVerify('RSA-SHA256')
  78   verify.update(toVerify, 'utf8')
  79
  80   return verify.verify(fromActor.publicKey, signedDocument.signature.signatureValue, 'base64')
  81 }
  82
  83 async function signJsonLDObject (byActor: MActor, data: any) {
  84   const signature = {
  85     type: 'RsaSignature2017',
  86     creator: byActor.url,
  87     created: new Date().toISOString()
  88   }
  89
  90   const [ documentHash, optionsHash ] = await Promise.all([
  91     createDocWithoutSignatureHash(data),
  92     createSignatureHash(signature)
  93   ])
  94
  95   const toSign = optionsHash + documentHash
  96
  97   const sign = createSign('RSA-SHA256')
  98   sign.update(toSign, 'utf8')
  99
 100   const signatureValue = sign.sign(byActor.privateKey, 'base64')
 101   Object.assign(signature, { signatureValue })
 102
 103   return Object.assign(data, { signature })
 104 }
 105
 106 function buildDigest (body: any) {
 107   const rawBody = typeof body === 'string' ? body : JSON.stringify(body)
 108
 109   return 'SHA-256=' + sha256(rawBody, 'base64')
 110 }
 111
 112 // ---------------------------------------------------------------------------
 113
 114 export {
 115   isHTTPSignatureDigestValid,
 116   parseHTTPSignature,
 117   isHTTPSignatureVerified,
 118   buildDigest,
 119   isJsonLDSignatureVerified,
 120   comparePassword,
 121   createPrivateAndPublicKeys,
 122   cryptPassword,
 123   signJsonLDObject
 124 }
 125
 126 // ---------------------------------------------------------------------------
 127
 128 function hash (obj: any): Promise<any> {
 129   return jsonld.promises
 130                .normalize(obj, {
 131                  algorithm: 'URDNA2015',
 132                  format: 'application/n-quads'
 133                })
 134                .then(res => sha256(res))
 135 }
 136
 137 function createSignatureHash (signature: any) {
 138   const signatureCopy = cloneDeep(signature)
 139   Object.assign(signatureCopy, {
 140     '@context': [
 141       'https://w3id.org/security/v1',
 142       { RsaSignature2017: 'https://w3id.org/security#RsaSignature2017' }
 143     ]
 144   })
 145
 146   delete signatureCopy.type
 147   delete signatureCopy.id
 148   delete signatureCopy.signatureValue
 149
 150   return hash(signatureCopy)
 151 }
 152
 153 function createDocWithoutSignatureHash (doc: any) {
 154   const docWithoutSignature = cloneDeep(doc)
 155   delete docWithoutSignature.signature
 156
 157   return hash(docWithoutSignature)
 158 }