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