import { Request } from 'express' import { BCRYPT_SALT_SIZE, HTTP_SIGNATURE, PRIVATE_RSA_KEY_SIZE } from '../initializers/constants' import { createPrivateKey, getPublicKey, promisify1, promisify2, sha256 } from './core-utils' import { jsonld } from './custom-jsonld-signature' import { logger } from './logger' import { cloneDeep } from 'lodash' import { createSign, createVerify } from 'crypto' import * as bcrypt from 'bcrypt' import { MActor } from '../typings/models' const bcryptComparePromise = promisify2(bcrypt.compare) const bcryptGenSaltPromise = promisify1(bcrypt.genSalt) const bcryptHashPromise = promisify2(bcrypt.hash) const httpSignature = require('http-signature') async function createPrivateAndPublicKeys () { logger.info('Generating a RSA key...') const { key } = await createPrivateKey(PRIVATE_RSA_KEY_SIZE) const { publicKey } = await getPublicKey(key) return { privateKey: key, publicKey } } // User password checks function comparePassword (plainPassword: string, hashPassword: string) { return bcryptComparePromise(plainPassword, hashPassword) } async function cryptPassword (password: string) { const salt = await bcryptGenSaltPromise(BCRYPT_SALT_SIZE) return bcryptHashPromise(password, salt) } // HTTP Signature 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: MActor): boolean { return httpSignature.verifySignature(httpSignatureParsed, actor.publicKey) === true } function parseHTTPSignature (req: Request, clockSkew?: number) { return httpSignature.parse(req, { clockSkew }) } // JSONLD function isJsonLDSignatureVerified (fromActor: MActor, signedDocument: any): Promise { if (signedDocument.signature.type === 'RsaSignature2017') { return isJsonLDRSA2017Verified(fromActor, signedDocument) } logger.warn('Unknown JSON LD signature %s.', signedDocument.signature.type, signedDocument) return Promise.resolve(false) } // Backward compatibility with "other" implementations async function isJsonLDRSA2017Verified (fromActor: MActor, signedDocument: any) { const [ documentHash, optionsHash ] = await Promise.all([ createDocWithoutSignatureHash(signedDocument), createSignatureHash(signedDocument.signature) ]) const toVerify = optionsHash + documentHash const verify = createVerify('RSA-SHA256') verify.update(toVerify, 'utf8') return verify.verify(fromActor.publicKey, signedDocument.signature.signatureValue, 'base64') } async function signJsonLDObject (byActor: MActor, data: any) { const signature = { type: 'RsaSignature2017', creator: byActor.url, created: new Date().toISOString() } const [ documentHash, optionsHash ] = await Promise.all([ createDocWithoutSignatureHash(data), createSignatureHash(signature) ]) const toSign = optionsHash + documentHash const sign = createSign('RSA-SHA256') sign.update(toSign, 'utf8') const signatureValue = sign.sign(byActor.privateKey, 'base64') Object.assign(signature, { signatureValue }) return Object.assign(data, { signature }) } function buildDigest (body: any) { const rawBody = typeof body === 'string' ? body : JSON.stringify(body) return 'SHA-256=' + sha256(rawBody, 'base64') } // --------------------------------------------------------------------------- export { isHTTPSignatureDigestValid, parseHTTPSignature, isHTTPSignatureVerified, buildDigest, isJsonLDSignatureVerified, comparePassword, createPrivateAndPublicKeys, cryptPassword, signJsonLDObject } // --------------------------------------------------------------------------- function hash (obj: any): Promise { return jsonld.promises .normalize(obj, { algorithm: 'URDNA2015', format: 'application/n-quads' }) .then(res => sha256(res)) } function createSignatureHash (signature: any) { const signatureCopy = cloneDeep(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 return hash(signatureCopy) } function createDocWithoutSignatureHash (doc: any) { const docWithoutSignature = cloneDeep(doc) delete docWithoutSignature.signature return hash(docWithoutSignature) }