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The MIT License (MIT) | ||
===================== | ||
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Copyright © 2016 Yury Popov | ||
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Permission is hereby granted, free of charge, to any person | ||
obtaining a copy of this software and associated documentation | ||
files (the “Software”), to deal in the Software without | ||
restriction, including without limitation the rights to use, | ||
copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
copies of the Software, and to permit persons to whom the | ||
Software is furnished to do so, subject to the following | ||
conditions: | ||
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The above copyright notice and this permission notice shall be | ||
included in all copies or substantial portions of the Software. | ||
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THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, | ||
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | ||
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | ||
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | ||
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | ||
OTHER DEALINGS IN THE SOFTWARE. |
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# Certificate common names extract library | ||
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[![NPM version](https://badge.fury.io/js/certnames.svg)](https://www.npmjs.com/package/certnames) | ||
[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg)](http://standardjs.com/) | ||
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This module provides API to get SSL certificate common names list. | ||
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## Usage | ||
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```javascript | ||
const certnames = require('certnames') | ||
const tls = require('tls') | ||
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const host = 'comodo.com' | ||
const sock = tls.connect(443, host) | ||
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sock.on('secureConnect', () => { | ||
const cert = sock.getPeerCertificate().raw | ||
const names = certnames.getCommonNames(cert) | ||
console.log('Common names: %j', names) | ||
// Common names: ["ssl383141.cloudflaressl.com","*.comodo.com","comodo.com"] | ||
const regex = certnames.toRegEx(names) | ||
console.log('Regex: %s', regex) | ||
// Regex: /^((ssl383141\.cloudflaressl\.com)|(([^\.]+\.)?(comodo\.com)))$/gm | ||
}) | ||
``` | ||
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## API | ||
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### getCommonNames(buffer[, encoding]) | ||
Extracts common names (with "alternative" if present) from buffer. Both `der` and `pem` encodings supported. | ||
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### toRegEx(names) | ||
Generates regular expression that match any of common name extracted before. Supports RegEx simplification, so wildcard and non-wildcard domains are grouped into single expression. | ||
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## Thanks to | ||
* [Fedor Indutny](https://github.com/indutny)<br> | ||
For powerful ASN.1 parser library | ||
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## LICENSE | ||
This software is licensed under the MIT License. | ||
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Copyright Yury Popov _a.k.a. [PhoeniX](https://phoenix.dj)_, 2016. | ||
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Permission is hereby granted, free of charge, to any person obtaining a | ||
copy of this software and associated documentation files (the | ||
"Software"), to deal in the Software without restriction, including | ||
without limitation the rights to use, copy, modify, merge, publish, | ||
distribute, sublicense, and/or sell copies of the Software, and to permit | ||
persons to whom the Software is furnished to do so, subject to the | ||
following conditions: | ||
|
||
The above copyright notice and this permission notice shall be included | ||
in all copies or substantial portions of the Software. | ||
|
||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | ||
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN | ||
NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, | ||
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | ||
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | ||
USE OR OTHER DEALINGS IN THE SOFTWARE. |
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'use strict' | ||
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const asn1 = require('asn1.js') | ||
const asn1Cert = require('asn1.js-rfc3280') | ||
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const ASNStr = asn1.define('ASNStr', function () { | ||
this.choice({ | ||
bit: this.bitstr(), | ||
bmp: this.bmpstr(), | ||
chr: this.charstr(), | ||
gen: this.genstr(), | ||
grp: this.graphstr(), | ||
ia5: this.ia5str(), | ||
iso: this.iso646str(), | ||
num: this.numstr(), | ||
oct: this.octstr(), | ||
prt: this.printstr(), | ||
t61: this.t61str(), | ||
uni: this.unistr(), | ||
utf: this.utf8str(), | ||
vid: this.videostr() | ||
}) | ||
}) | ||
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function getCommonNames (buffer, encoding) { | ||
if (encoding === undefined) { | ||
encoding = (/^\s*-----\s*BEGIN/.test(buffer.toString())) ? 'pem' : 'der' | ||
} | ||
const cert = asn1Cert.Certificate.decode(buffer, encoding, {label: 'CERTIFICATE'}) | ||
var names = [] | ||
cert.tbsCertificate.subject.value.forEach((e) => { | ||
if (e[0].type.join('.') !== '2.5.4.3') return | ||
names.push(ASNStr.decode(e[0].value).value) | ||
}) | ||
cert.tbsCertificate.extensions.forEach((e) => { | ||
if (e.extnID.join('.') !== '2.5.29.17') return | ||
names.push.apply(names, asn1Cert.GeneralNames.decode(e.extnValue).map((e) => { | ||
switch (e.type) { | ||
case 'dNSName': | ||
return e.value | ||
case 'iPAddress': | ||
return [e.value[0], e.value[1], e.value[2], e.value[3]].join('.') | ||
default: | ||
console.log('Unknown type: %s', e.type) | ||
return null | ||
} | ||
})) | ||
}) | ||
return names.filter((e, i, s) => { | ||
if (e === null) return false | ||
return s.indexOf(e) === i | ||
}) | ||
} | ||
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function toRegEx (names) { | ||
const domains = { wc: [], single: [], both: [] } | ||
names.forEach((e) => { | ||
var wc = false | ||
if (e[0] === '*') { | ||
wc = true | ||
e = e.split('.').splice(1).join('.') | ||
} | ||
e = e.replace(/\./g, '\\.') | ||
if (wc) domains.wc.push(e) | ||
else domains.single.push(e) | ||
}) | ||
domains.wc = domains.wc.filter((e) => { | ||
const idx = domains.single.indexOf(e) | ||
if (idx === -1) return true | ||
domains.single.splice(idx, 1) | ||
domains.both.push(e) | ||
return false | ||
}) | ||
const entries = [] | ||
if (domains.single.length > 0) { | ||
entries.push(domains.single.join('|')) | ||
} | ||
if (domains.wc.length > 0) { | ||
entries.push('[^\\.]+\\.(' + domains.wc.join('|') + ')') | ||
} | ||
if (domains.both.length > 0) { | ||
entries.push('([^\\.]+\\.)?(' + domains.both.join('|') + ')') | ||
} | ||
return new RegExp('^((' + entries.join(')|(') + '))$', 'gm') | ||
} | ||
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exports.getCommonNames = getCommonNames | ||
exports.toRegEx = toRegEx |
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{ | ||
"name": "certnames", | ||
"version": "1.0.0", | ||
"description": "Export certificate common names from buffer", | ||
"main": "index.js", | ||
"scripts": { | ||
"test": "echo \"Error: no test specified\" && exit 1" | ||
}, | ||
"repository": { | ||
"type": "git", | ||
"url": "https://git.phoenix.dj/phoenix/node-certnames.git" | ||
}, | ||
"keywords": [ | ||
"x509", | ||
"certificate", | ||
"asn1" | ||
], | ||
"author": "PhoeniX", | ||
"license": "MIT", | ||
"dependencies": { | ||
"asn1.js": "^4.6.2", | ||
"asn1.js-rfc3280": "^4.0.0" | ||
} | ||
} |