89 lines
3 KiB
JavaScript
89 lines
3 KiB
JavaScript
|
// Copyright 2015 Joyent, Inc.
|
||
|
|
|
||
|
|
var assert = require('assert-plus');
|
||
|
|
var crypto = require('crypto');
|
||
|
|
var sshpk = require('sshpk');
|
||
|
|
var utils = require('./utils');
|
||
|
|
|
||
|
|
var HASH_ALGOS = utils.HASH_ALGOS;
|
||
|
|
var PK_ALGOS = utils.PK_ALGOS;
|
||
|
|
var InvalidAlgorithmError = utils.InvalidAlgorithmError;
|
||
|
|
var HttpSignatureError = utils.HttpSignatureError;
|
||
|
|
var validateAlgorithm = utils.validateAlgorithm;
|
||
|
|
|
||
|
|
///--- Exported API
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
/**
|
||
|
|
* Verify RSA/DSA signature against public key. You are expected to pass in
|
||
|
|
* an object that was returned from `parse()`.
|
||
|
|
*
|
||
|
|
* @param {Object} parsedSignature the object you got from `parse`.
|
||
|
|
* @param {String} pubkey RSA/DSA private key PEM.
|
||
|
|
* @return {Boolean} true if valid, false otherwise.
|
||
|
|
* @throws {TypeError} if you pass in bad arguments.
|
||
|
|
* @throws {InvalidAlgorithmError}
|
||
|
|
*/
|
||
|
|
verifySignature: function verifySignature(parsedSignature, pubkey) {
|
||
|
|
assert.object(parsedSignature, 'parsedSignature');
|
||
|
|
if (typeof (pubkey) === 'string' || Buffer.isBuffer(pubkey))
|
||
|
|
pubkey = sshpk.parseKey(pubkey);
|
||
|
|
assert.ok(sshpk.Key.isKey(pubkey, [1, 1]), 'pubkey must be a sshpk.Key');
|
||
|
|
|
||
|
|
var alg = validateAlgorithm(parsedSignature.algorithm);
|
||
|
|
if (alg[0] === 'hmac' || alg[0] !== pubkey.type)
|
||
|
|
return (false);
|
||
|
|
|
||
|
|
var v = pubkey.createVerify(alg[1]);
|
||
|
|
v.update(parsedSignature.signingString);
|
||
|
|
return (v.verify(parsedSignature.params.signature, 'base64'));
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Verify HMAC against shared secret. You are expected to pass in an object
|
||
|
|
* that was returned from `parse()`.
|
||
|
|
*
|
||
|
|
* @param {Object} parsedSignature the object you got from `parse`.
|
||
|
|
* @param {String} secret HMAC shared secret.
|
||
|
|
* @return {Boolean} true if valid, false otherwise.
|
||
|
|
* @throws {TypeError} if you pass in bad arguments.
|
||
|
|
* @throws {InvalidAlgorithmError}
|
||
|
|
*/
|
||
|
|
verifyHMAC: function verifyHMAC(parsedSignature, secret) {
|
||
|
|
assert.object(parsedSignature, 'parsedHMAC');
|
||
|
|
assert.string(secret, 'secret');
|
||
|
|
|
||
|
|
var alg = validateAlgorithm(parsedSignature.algorithm);
|
||
|
|
if (alg[0] !== 'hmac')
|
||
|
|
return (false);
|
||
|
|
|
||
|
|
var hashAlg = alg[1].toUpperCase();
|
||
|
|
|
||
|
|
var hmac = crypto.createHmac(hashAlg, secret);
|
||
|
|
hmac.update(parsedSignature.signingString);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Now double-hash to avoid leaking timing information - there's
|
||
|
|
* no easy constant-time compare in JS, so we use this approach
|
||
|
|
* instead. See for more info:
|
||
|
|
* https://www.isecpartners.com/blog/2011/february/double-hmac-
|
||
|
|
* verification.aspx
|
||
|
|
*/
|
||
|
|
var h1 = crypto.createHmac(hashAlg, secret);
|
||
|
|
h1.update(hmac.digest());
|
||
|
|
h1 = h1.digest();
|
||
|
|
var h2 = crypto.createHmac(hashAlg, secret);
|
||
|
|
h2.update(new Buffer(parsedSignature.params.signature, 'base64'));
|
||
|
|
h2 = h2.digest();
|
||
|
|
|
||
|
|
/* Node 0.8 returns strings from .digest(). */
|
||
|
|
if (typeof (h1) === 'string')
|
||
|
|
return (h1 === h2);
|
||
|
|
/* And node 0.10 lacks the .equals() method on Buffers. */
|
||
|
|
if (Buffer.isBuffer(h1) && !h1.equals)
|
||
|
|
return (h1.toString('binary') === h2.toString('binary'));
|
||
|
|
|
||
|
|
return (h1.equals(h2));
|
||
|
|
}
|
||
|
|
};
|