X-Git-Url: https://git.immae.eu/?a=blobdiff_plain;f=server%2Fhelpers%2Fpeertube-crypto.ts;h=ab9ec077ee3957806d6009207d5349fedb0209f6;hb=5c6d985faeef1d6793d3f44ca6374f1a9b722806;hp=47f0243e7e5ee5bb4daeb5640d7b848659a62738;hpb=f5028693a896a3076dd286ac0030e3d8f78f5ebf;p=github%2FChocobozzz%2FPeerTube.git

diff --git a/server/helpers/peertube-crypto.ts b/server/helpers/peertube-crypto.ts
index 47f0243e7..ab9ec077e 100644
--- a/server/helpers/peertube-crypto.ts
+++ b/server/helpers/peertube-crypto.ts
@@ -1,148 +1,149 @@
-import * as crypto from 'crypto'
-import { join } from 'path'
-
-import {
-  SIGNATURE_ALGORITHM,
-  SIGNATURE_ENCODING,
-  PRIVATE_CERT_NAME,
-  CONFIG,
-  BCRYPT_SALT_SIZE,
-  PUBLIC_CERT_NAME
-} from '../initializers'
-import {
-  readFilePromise,
-  bcryptComparePromise,
-  bcryptGenSaltPromise,
-  bcryptHashPromise,
-  accessPromise,
-  opensslExecPromise
-} from './core-utils'
+import { Request } from 'express'
+import { BCRYPT_SALT_SIZE, HTTP_SIGNATURE, PRIVATE_RSA_KEY_SIZE } from '../initializers'
+import { ActorModel } from '../models/activitypub/actor'
+import { bcryptComparePromise, bcryptGenSaltPromise, bcryptHashPromise, createPrivateKey, getPublicKey, sha256 } from './core-utils'
+import { jsig, jsonld } from './custom-jsonld-signature'
 import { logger } from './logger'
+import { cloneDeep } from 'lodash'
+import { createVerify } from 'crypto'
+import { buildDigest } from '../lib/job-queue/handlers/utils/activitypub-http-utils'
 
-function checkSignature (publicKey: string, data: string, hexSignature: string) {
-  const verify = crypto.createVerify(SIGNATURE_ALGORITHM)
-
-  let dataString
-  if (typeof data === 'string') {
-    dataString = data
-  } else {
-    try {
-      dataString = JSON.stringify(data)
-    } catch (err) {
-      logger.error('Cannot check signature.', err)
-      return false
-    }
-  }
-
-  verify.update(dataString, 'utf8')
+const httpSignature = require('http-signature')
 
-  const isValid = verify.verify(publicKey, hexSignature, SIGNATURE_ENCODING)
-  return isValid
-}
-
-async function sign (data: string|Object) {
-  const sign = crypto.createSign(SIGNATURE_ALGORITHM)
-
-  let dataString: string
-  if (typeof data === 'string') {
-    dataString = data
-  } else {
-    try {
-      dataString = JSON.stringify(data)
-    } catch (err) {
-      logger.error('Cannot sign data.', err)
-      return ''
-    }
-  }
+async function createPrivateAndPublicKeys () {
+  logger.info('Generating a RSA key...')
 
-  sign.update(dataString, 'utf8')
+  const { key } = await createPrivateKey(PRIVATE_RSA_KEY_SIZE)
+  const { publicKey } = await getPublicKey(key)
 
-  const myKey = await getMyPrivateCert()
-  return await sign.sign(myKey, SIGNATURE_ENCODING)
+  return { privateKey: key, publicKey }
 }
 
+// User password checks
+
 function comparePassword (plainPassword: string, hashPassword: string) {
   return bcryptComparePromise(plainPassword, hashPassword)
 }
 
-async function createCertsIfNotExist () {
-  const exist = await certsExist()
-  if (exist === true) {
-    return undefined
-  }
-
-  return await createCerts()
-}
-
 async function cryptPassword (password: string) {
   const salt = await bcryptGenSaltPromise(BCRYPT_SALT_SIZE)
 
-  return await bcryptHashPromise(password, salt)
+  return bcryptHashPromise(password, salt)
 }
 
-function getMyPrivateCert () {
-  const certPath = join(CONFIG.STORAGE.CERT_DIR, PRIVATE_CERT_NAME)
-  return readFilePromise(certPath, 'utf8')
-}
+// HTTP Signature
 
-function getMyPublicCert () {
-  const certPath = join(CONFIG.STORAGE.CERT_DIR, PUBLIC_CERT_NAME)
-  return readFilePromise(certPath, 'utf8')
+function isHTTPSignatureDigestValid (rawBody: Buffer, req: Request): boolean {
+  if (req.headers[HTTP_SIGNATURE.HEADER_NAME] && req.headers['digest']) {
+    return buildDigest(rawBody.toString()) === req.headers['digest']
+  }
+
+  return true
 }
 
-// ---------------------------------------------------------------------------
+function isHTTPSignatureVerified (httpSignatureParsed: any, actor: ActorModel): boolean {
+  return httpSignature.verifySignature(httpSignatureParsed, actor.publicKey) === true
+}
 
-export {
-  checkSignature,
-  comparePassword,
-  createCertsIfNotExist,
-  cryptPassword,
-  getMyPrivateCert,
-  getMyPublicCert,
-  sign
+function parseHTTPSignature (req: Request, clockSkew?: number) {
+  return httpSignature.parse(req, { authorizationHeaderName: HTTP_SIGNATURE.HEADER_NAME, clockSkew })
 }
 
-// ---------------------------------------------------------------------------
+// JSONLD
 
-async function certsExist () {
-  const certPath = join(CONFIG.STORAGE.CERT_DIR, PRIVATE_CERT_NAME)
+async function isJsonLDSignatureVerified (fromActor: ActorModel, signedDocument: any): Promise<boolean> {
+  if (signedDocument.signature.type === 'RsaSignature2017') {
+    // Mastodon algorithm
+    const res = await isJsonLDRSA2017Verified(fromActor, signedDocument)
+    // Success? If no, try with our library
+    if (res === true) return true
+  }
 
-  // If there is an error the certificates do not exist
-  try {
-    await accessPromise(certPath)
+  const publicKeyObject = {
+    '@context': jsig.SECURITY_CONTEXT_URL,
+    id: fromActor.url,
+    type: 'CryptographicKey',
+    owner: fromActor.url,
+    publicKeyPem: fromActor.publicKey
+  }
 
-    return true
-  } catch {
-    return false
+  const publicKeyOwnerObject = {
+    '@context': jsig.SECURITY_CONTEXT_URL,
+    id: fromActor.url,
+    publicKey: [ publicKeyObject ]
   }
-}
 
-async function createCerts () {
-  const exist = await certsExist()
-  if (exist === true) {
-    const errorMessage = 'Certs already exist.'
-    logger.warning(errorMessage)
-    throw new Error(errorMessage)
+  const options = {
+    publicKey: publicKeyObject,
+    publicKeyOwner: publicKeyOwnerObject
   }
 
-  logger.info('Generating a RSA key...')
+  return jsig.promises
+             .verify(signedDocument, options)
+             .then((result: { verified: boolean }) => result.verified)
+             .catch(err => {
+               logger.error('Cannot check signature.', { err })
+               return false
+             })
+}
 
-  const privateCertPath = join(CONFIG.STORAGE.CERT_DIR, PRIVATE_CERT_NAME)
-  const genRsaOptions = {
-    'out': privateCertPath,
-    '2048': false
+// Backward compatibility with "other" implementations
+async function isJsonLDRSA2017Verified (fromActor: ActorModel, signedDocument: any) {
+  function hash (obj: any): Promise<any> {
+    return jsonld.promises
+                 .normalize(obj, {
+                   algorithm: 'URDNA2015',
+                   format: 'application/n-quads'
+                 })
+                 .then(res => sha256(res))
   }
 
-  await opensslExecPromise('genrsa', genRsaOptions)
-  logger.info('RSA key generated.')
-  logger.info('Managing public key...')
+  const signatureCopy = cloneDeep(signedDocument.signature)
+  Object.assign(signatureCopy, {
+    '@context': [
+      'https://w3id.org/security/v1',
+      { RsaSignature2017: 'https://w3id.org/security#RsaSignature2017' }
+    ]
+  })
+  delete signatureCopy.type
+  delete signatureCopy.id
+  delete signatureCopy.signatureValue
+
+  const docWithoutSignature = cloneDeep(signedDocument)
+  delete docWithoutSignature.signature
+
+  const [ documentHash, optionsHash ] = await Promise.all([
+    hash(docWithoutSignature),
+    hash(signatureCopy)
+  ])
+
+  const toVerify = optionsHash + documentHash
+
+  const verify = createVerify('RSA-SHA256')
+  verify.update(toVerify, 'utf8')
 
-  const publicCertPath = join(CONFIG.STORAGE.CERT_DIR, 'peertube.pub')
-  const rsaOptions = {
-    'in': privateCertPath,
-    'pubout': true,
-    'out': publicCertPath
+  return verify.verify(fromActor.publicKey, signedDocument.signature.signatureValue, 'base64')
+}
+
+function signJsonLDObject (byActor: ActorModel, data: any) {
+  const options = {
+    privateKeyPem: byActor.privateKey,
+    creator: byActor.url,
+    algorithm: 'RsaSignature2017'
   }
 
-  await opensslExecPromise('rsa', rsaOptions)
+  return jsig.promises.sign(data, options)
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  isHTTPSignatureDigestValid,
+  parseHTTPSignature,
+  isHTTPSignatureVerified,
+  isJsonLDSignatureVerified,
+  comparePassword,
+  createPrivateAndPublicKeys,
+  cryptPassword,
+  signJsonLDObject
 }