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tls: fix object prototype type confusion #14447

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tls: fix object prototype type confusion #14447

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7 changes: 2 additions & 5 deletions lib/_tls_common.js
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Original file line number Diff line number Diff line change
Expand Up @@ -176,14 +176,11 @@ exports.translatePeerCertificate = function translatePeerCertificate(c) {
if (c.subject != null) c.subject = tls.parseCertString(c.subject);
if (c.infoAccess != null) {
var info = c.infoAccess;
c.infoAccess = {};
c.infoAccess = Object.create(null);

// XXX: More key validation?
info.replace(/([^\n:]*):([^\n]*)(?:\n|$)/g, function(all, key, val) {
if (key === '__proto__')
return;

if (c.infoAccess.hasOwnProperty(key))
if (key in c.infoAccess)
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@mscdex mscdex Jul 24, 2017 •
edited
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Perhaps a c.infoAccess[key] === undefined would be more efficient?

Or just save the value to a variable and use that value here and use it to skip the lookups below.

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Unlikely to matter because it's only a handful of keys (if it's set at all.) This is shorter so that's what I picked.

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Did a micro benchmark for that on TF&I. Small benefit for in

> var o = {a:1, b:2, c:3, d:4, e:5}
> var j = 0
> console.time('in'); for (let i = 0; i < 1e8; ++i) {const key = String.fromCharCode(97 + (i % 10)); if (key in o) ++j};console.timeEnd('in')
in: 2614.723ms
> console.time('!=='); for (let i = 0; i < 1e8; ++i) {const key = String.fromCharCode(97 + (i % 10)); if (o[key] !== undefined) ++j};console.timeEnd('!==')
!==: 3160.657ms
> console.time('!in'); for (let i = 0; i < 1e8; ++i) {const key = String.fromCharCode(97 + (i % 10)); if (!(key in o)) ++j};console.timeEnd('!in')
!in: 2842.438ms
> console.time('==='); for (let i = 0; i < 1e8; ++i) {const key = String.fromCharCode(97 + (i % 10)); if (o[key] === undefined) ++j};console.timeEnd('===')
===: 2884.768ms
> console.time('!=='); for (let i = 0; i < 1e8; ++i) {const key = String.fromCharCode(97 + (i % 10)); if (o[key] !== undefined) ++j};console.timeEnd('!==')
!==: 2999.367ms
> console.time('==='); for (let i = 0; i < 1e8; ++i) {const key = String.fromCharCode(97 + (i % 10)); if (o[key] === undefined) ++j};console.timeEnd('===')
===: 3113.552ms
> console.time('!in'); for (let i = 0; i < 1e8; ++i) {const key = String.fromCharCode(97 + (i % 10)); if (!(key in o)) ++j};console.timeEnd('!in')
!in: 2679.466ms
>

c.infoAccess[key].push(val);
else
c.infoAccess[key] = [val];
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2 changes: 1 addition & 1 deletion lib/tls.js
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Expand Up @@ -231,7 +231,7 @@ exports.checkServerIdentity = function checkServerIdentity(host, cert) {
// Example:
// C=US\nST=CA\nL=SF\nO=Joyent\nOU=Node.js\nCN=ca1\[email protected]
exports.parseCertString = function parseCertString(s) {
var out = {};
var out = Object.create(null);
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We have treated other changes like this as semver-major. Think this will cause breakage?

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It might, hard to say. It would break conn.getPeerCertificate().hasOwnProperty(k) but then again, such code is vulnerable to object manipulation now.

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Yes, but it's still technically semver-major. @nodejs/ctc ... thoughts?

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I think it should be semver-major, as currently parseCertString is documented. I would prefer otherwise.

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@mcollina parseCertString() isn't documented. You might be thinking of #14193.

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Then it's not semver-major for me. I'd go for semver-minor, or even patch.

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There are too many PRs interacting with this change.

var parts = s.split('\n');
for (var i = 0, len = parts.length; i < len; i++) {
var sepIndex = parts[i].indexOf('=');
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13 changes: 12 additions & 1 deletion test/parallel/test-tls-parse-cert-string.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
/* eslint-disable no-proto */
'use strict';
const common = require('../common');
if (!common.hasCrypto)
Expand All @@ -11,6 +12,7 @@ const tls = require('tls');
'CN=ca1\[email protected]';
const singlesOut = tls.parseCertString(singles);
assert.deepStrictEqual(singlesOut, {
__proto__: null,
C: 'US',
ST: 'CA',
L: 'SF',
Expand All @@ -26,6 +28,7 @@ const tls = require('tls');
'CN=*.nodejs.org';
const doublesOut = tls.parseCertString(doubles);
assert.deepStrictEqual(doublesOut, {
__proto__: null,
OU: [ 'Domain Control Validated', 'PositiveSSL Wildcard' ],
CN: '*.nodejs.org'
});
Expand All @@ -34,5 +37,13 @@ const tls = require('tls');
{
const invalid = 'fhqwhgads';
const invalidOut = tls.parseCertString(invalid);
assert.deepStrictEqual(invalidOut, {});
assert.deepStrictEqual(invalidOut, { __proto__: null });
}

{
const input = '__proto__=mostly harmless\nhasOwnProperty=not a function';
const expected = Object.create(null);
expected.__proto__ = 'mostly harmless';
expected.hasOwnProperty = 'not a function';
assert.deepStrictEqual(tls.parseCertString(input), expected);
}
30 changes: 22 additions & 8 deletions test/parallel/test-tls-translate-peer-certificate.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
/* eslint-disable no-proto */
'use strict';
const common = require('../common');

Expand All @@ -7,8 +8,12 @@ if (!common.hasCrypto)
const { strictEqual, deepStrictEqual } = require('assert');
const { translatePeerCertificate } = require('_tls_common');

const certString = 'A=1\nB=2\nC=3';
const certObject = { A: '1', B: '2', C: '3' };
const certString = '__proto__=42\nA=1\nB=2\nC=3';
const certObject = Object.create(null);
certObject.__proto__ = '42';
certObject.A = '1';
certObject.B = '2';
certObject.C = '3';

strictEqual(translatePeerCertificate(null), null);
strictEqual(translatePeerCertificate(undefined), null);
Expand All @@ -19,14 +24,14 @@ strictEqual(translatePeerCertificate(1), 1);
deepStrictEqual(translatePeerCertificate({}), {});

deepStrictEqual(translatePeerCertificate({ issuer: '' }),
{ issuer: {} });
{ issuer: Object.create(null) });
deepStrictEqual(translatePeerCertificate({ issuer: null }),
{ issuer: null });
deepStrictEqual(translatePeerCertificate({ issuer: certString }),
{ issuer: certObject });

deepStrictEqual(translatePeerCertificate({ subject: '' }),
{ subject: {} });
{ subject: Object.create(null) });
deepStrictEqual(translatePeerCertificate({ subject: null }),
{ subject: null });
deepStrictEqual(translatePeerCertificate({ subject: certString }),
Expand All @@ -47,9 +52,18 @@ deepStrictEqual(
}

deepStrictEqual(translatePeerCertificate({ infoAccess: '' }),
{ infoAccess: {} });
{ infoAccess: Object.create(null) });
deepStrictEqual(translatePeerCertificate({ infoAccess: null }),
{ infoAccess: null });
deepStrictEqual(
translatePeerCertificate({ infoAccess: 'OCSP - URI:file:///etc/passwd' }),
{ infoAccess: { 'OCSP - URI': ['file:///etc/passwd'] } });
{
const input =
'__proto__:mostly harmless\n' +
'hasOwnProperty:not a function\n' +
'OCSP - URI:file:///etc/passwd\n';
const expected = Object.create(null);
expected.__proto__ = ['mostly harmless'];
expected.hasOwnProperty = ['not a function'];
expected['OCSP - URI'] = ['file:///etc/passwd'];
deepStrictEqual(translatePeerCertificate({ infoAccess: input }),
{ infoAccess: expected });
}