162 lines
4.8 KiB
TypeScript
162 lines
4.8 KiB
TypeScript
import { compare, genSalt, hash } from 'bcrypt'
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import { createSign, createVerify } from 'crypto'
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import { Request } from 'express'
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import { cloneDeep } from 'lodash'
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import { BCRYPT_SALT_SIZE, HTTP_SIGNATURE, PRIVATE_RSA_KEY_SIZE } from '../initializers/constants'
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import { MActor } from '../types/models'
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import { createPrivateKey, getPublicKey, promisify1, promisify2, sha256 } from './core-utils'
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import { jsonld } from './custom-jsonld-signature'
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import { logger } from './logger'
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const bcryptComparePromise = promisify2<any, string, boolean>(compare)
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const bcryptGenSaltPromise = promisify1<number, string>(genSalt)
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const bcryptHashPromise = promisify2<any, string | number, string>(hash)
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const httpSignature = require('http-signature')
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async function createPrivateAndPublicKeys () {
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logger.info('Generating a RSA key...')
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const { key } = await createPrivateKey(PRIVATE_RSA_KEY_SIZE)
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const { publicKey } = await getPublicKey(key)
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return { privateKey: key, publicKey }
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}
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// User password checks
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function comparePassword (plainPassword: string, hashPassword: string) {
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return bcryptComparePromise(plainPassword, hashPassword)
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}
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async function cryptPassword (password: string) {
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const salt = await bcryptGenSaltPromise(BCRYPT_SALT_SIZE)
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return bcryptHashPromise(password, salt)
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}
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// HTTP Signature
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function isHTTPSignatureDigestValid (rawBody: Buffer, req: Request): boolean {
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if (req.headers[HTTP_SIGNATURE.HEADER_NAME] && req.headers['digest']) {
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return buildDigest(rawBody.toString()) === req.headers['digest']
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}
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return true
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}
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function isHTTPSignatureVerified (httpSignatureParsed: any, actor: MActor): boolean {
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return httpSignature.verifySignature(httpSignatureParsed, actor.publicKey) === true
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}
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function parseHTTPSignature (req: Request, clockSkew?: number) {
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const headers = req.method === 'POST'
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? HTTP_SIGNATURE.REQUIRED_HEADERS.POST
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: HTTP_SIGNATURE.REQUIRED_HEADERS.ALL
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return httpSignature.parse(req, { clockSkew, headers })
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}
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// JSONLD
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function isJsonLDSignatureVerified (fromActor: MActor, signedDocument: any): Promise<boolean> {
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if (signedDocument.signature.type === 'RsaSignature2017') {
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return isJsonLDRSA2017Verified(fromActor, signedDocument)
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}
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logger.warn('Unknown JSON LD signature %s.', signedDocument.signature.type, signedDocument)
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return Promise.resolve(false)
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}
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// Backward compatibility with "other" implementations
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async function isJsonLDRSA2017Verified (fromActor: MActor, signedDocument: any) {
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const [ documentHash, optionsHash ] = await Promise.all([
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createDocWithoutSignatureHash(signedDocument),
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createSignatureHash(signedDocument.signature)
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])
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const toVerify = optionsHash + documentHash
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const verify = createVerify('RSA-SHA256')
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verify.update(toVerify, 'utf8')
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return verify.verify(fromActor.publicKey, signedDocument.signature.signatureValue, 'base64')
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}
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async function signJsonLDObject <T> (byActor: MActor, data: T) {
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const signature = {
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type: 'RsaSignature2017',
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creator: byActor.url,
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created: new Date().toISOString()
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}
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const [ documentHash, optionsHash ] = await Promise.all([
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createDocWithoutSignatureHash(data),
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createSignatureHash(signature)
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])
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const toSign = optionsHash + documentHash
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const sign = createSign('RSA-SHA256')
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sign.update(toSign, 'utf8')
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const signatureValue = sign.sign(byActor.privateKey, 'base64')
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Object.assign(signature, { signatureValue })
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return Object.assign(data, { signature })
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}
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function buildDigest (body: any) {
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const rawBody = typeof body === 'string' ? body : JSON.stringify(body)
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return 'SHA-256=' + sha256(rawBody, 'base64')
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}
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// ---------------------------------------------------------------------------
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export {
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isHTTPSignatureDigestValid,
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parseHTTPSignature,
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isHTTPSignatureVerified,
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buildDigest,
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isJsonLDSignatureVerified,
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comparePassword,
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createPrivateAndPublicKeys,
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cryptPassword,
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signJsonLDObject
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}
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// ---------------------------------------------------------------------------
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function hashObject (obj: any): Promise<any> {
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return jsonld.promises
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.normalize(obj, {
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algorithm: 'URDNA2015',
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format: 'application/n-quads'
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})
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.then(res => sha256(res))
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}
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function createSignatureHash (signature: any) {
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const signatureCopy = cloneDeep(signature)
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Object.assign(signatureCopy, {
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'@context': [
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'https://w3id.org/security/v1',
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{ RsaSignature2017: 'https://w3id.org/security#RsaSignature2017' }
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]
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})
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delete signatureCopy.type
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delete signatureCopy.id
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delete signatureCopy.signatureValue
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return hashObject(signatureCopy)
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}
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function createDocWithoutSignatureHash (doc: any) {
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const docWithoutSignature = cloneDeep(doc)
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delete docWithoutSignature.signature
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return hashObject(docWithoutSignature)
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}
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