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import { compare, genSalt, hash } from 'bcrypt'
import { createSign, createVerify } from 'crypto'
import { Request } from 'express'
import { cloneDeep } from 'lodash'
import { BCRYPT_SALT_SIZE, HTTP_SIGNATURE, PRIVATE_RSA_KEY_SIZE } from '../initializers/constants'
import { MActor } from '../types/models'
import { createPrivateKey, getPublicKey, promisify1, promisify2, sha256 } from './core-utils'
import { jsonld } from './custom-jsonld-signature'
import { logger } from './logger'
const bcryptComparePromise = promisify2<any, string, boolean>(compare)
const bcryptGenSaltPromise = promisify1<number, string>(genSalt)
const bcryptHashPromise = promisify2<any, string | number, string>(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) {
const headers = req.method === 'POST'
? HTTP_SIGNATURE.REQUIRED_HEADERS.POST
: HTTP_SIGNATURE.REQUIRED_HEADERS.ALL
return httpSignature.parse(req, { clockSkew, headers })
}
// JSONLD
function isJsonLDSignatureVerified (fromActor: MActor, signedDocument: any): Promise<boolean> {
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 <T> (byActor: MActor, data: T) {
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 hashObject (obj: any): Promise<any> {
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 hashObject(signatureCopy)
}
function createDocWithoutSignatureHash (doc: any) {
const docWithoutSignature = cloneDeep(doc)
delete docWithoutSignature.signature
return hashObject(docWithoutSignature)
}
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