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288 lines
9.0 KiB
288 lines
9.0 KiB
1 month ago
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// Copyright 2017 Joyent, Inc.
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module.exports = {
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read: read,
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write: write
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};
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var assert = require('assert-plus');
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var Buffer = require('safer-buffer').Buffer;
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var Key = require('../key');
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var PrivateKey = require('../private-key');
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var utils = require('../utils');
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var SSHBuffer = require('../ssh-buffer');
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var Dhe = require('../dhe');
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var supportedAlgos = {
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'rsa-sha1' : 5,
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'rsa-sha256' : 8,
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'rsa-sha512' : 10,
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'ecdsa-p256-sha256' : 13,
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'ecdsa-p384-sha384' : 14
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/*
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* ed25519 is hypothetically supported with id 15
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* but the common tools available don't appear to be
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* capable of generating/using ed25519 keys
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*/
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};
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var supportedAlgosById = {};
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Object.keys(supportedAlgos).forEach(function (k) {
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supportedAlgosById[supportedAlgos[k]] = k.toUpperCase();
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});
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function read(buf, options) {
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if (typeof (buf) !== 'string') {
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assert.buffer(buf, 'buf');
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buf = buf.toString('ascii');
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}
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var lines = buf.split('\n');
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if (lines[0].match(/^Private-key-format\: v1/)) {
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var algElems = lines[1].split(' ');
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var algoNum = parseInt(algElems[1], 10);
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var algoName = algElems[2];
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if (!supportedAlgosById[algoNum])
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throw (new Error('Unsupported algorithm: ' + algoName));
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return (readDNSSECPrivateKey(algoNum, lines.slice(2)));
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}
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// skip any comment-lines
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var line = 0;
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/* JSSTYLED */
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while (lines[line].match(/^\;/))
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line++;
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// we should now have *one single* line left with our KEY on it.
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if ((lines[line].match(/\. IN KEY /) ||
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lines[line].match(/\. IN DNSKEY /)) && lines[line+1].length === 0) {
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return (readRFC3110(lines[line]));
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}
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throw (new Error('Cannot parse dnssec key'));
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}
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function readRFC3110(keyString) {
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var elems = keyString.split(' ');
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//unused var flags = parseInt(elems[3], 10);
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//unused var protocol = parseInt(elems[4], 10);
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var algorithm = parseInt(elems[5], 10);
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if (!supportedAlgosById[algorithm])
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throw (new Error('Unsupported algorithm: ' + algorithm));
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var base64key = elems.slice(6, elems.length).join();
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var keyBuffer = Buffer.from(base64key, 'base64');
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if (supportedAlgosById[algorithm].match(/^RSA-/)) {
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// join the rest of the body into a single base64-blob
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var publicExponentLen = keyBuffer.readUInt8(0);
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if (publicExponentLen != 3 && publicExponentLen != 1)
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throw (new Error('Cannot parse dnssec key: ' +
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'unsupported exponent length'));
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var publicExponent = keyBuffer.slice(1, publicExponentLen+1);
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publicExponent = utils.mpNormalize(publicExponent);
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var modulus = keyBuffer.slice(1+publicExponentLen);
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modulus = utils.mpNormalize(modulus);
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// now, make the key
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var rsaKey = {
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type: 'rsa',
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parts: []
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};
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rsaKey.parts.push({ name: 'e', data: publicExponent});
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rsaKey.parts.push({ name: 'n', data: modulus});
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return (new Key(rsaKey));
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}
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if (supportedAlgosById[algorithm] === 'ECDSA-P384-SHA384' ||
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supportedAlgosById[algorithm] === 'ECDSA-P256-SHA256') {
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var curve = 'nistp384';
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var size = 384;
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if (supportedAlgosById[algorithm].match(/^ECDSA-P256-SHA256/)) {
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curve = 'nistp256';
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size = 256;
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}
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var ecdsaKey = {
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type: 'ecdsa',
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curve: curve,
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size: size,
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parts: [
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{name: 'curve', data: Buffer.from(curve) },
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{name: 'Q', data: utils.ecNormalize(keyBuffer) }
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]
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};
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return (new Key(ecdsaKey));
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}
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throw (new Error('Unsupported algorithm: ' +
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supportedAlgosById[algorithm]));
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}
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function elementToBuf(e) {
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return (Buffer.from(e.split(' ')[1], 'base64'));
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}
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function readDNSSECRSAPrivateKey(elements) {
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var rsaParams = {};
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elements.forEach(function (element) {
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if (element.split(' ')[0] === 'Modulus:')
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rsaParams['n'] = elementToBuf(element);
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else if (element.split(' ')[0] === 'PublicExponent:')
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rsaParams['e'] = elementToBuf(element);
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else if (element.split(' ')[0] === 'PrivateExponent:')
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rsaParams['d'] = elementToBuf(element);
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else if (element.split(' ')[0] === 'Prime1:')
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rsaParams['p'] = elementToBuf(element);
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else if (element.split(' ')[0] === 'Prime2:')
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rsaParams['q'] = elementToBuf(element);
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else if (element.split(' ')[0] === 'Exponent1:')
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rsaParams['dmodp'] = elementToBuf(element);
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else if (element.split(' ')[0] === 'Exponent2:')
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rsaParams['dmodq'] = elementToBuf(element);
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else if (element.split(' ')[0] === 'Coefficient:')
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rsaParams['iqmp'] = elementToBuf(element);
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});
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// now, make the key
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var key = {
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type: 'rsa',
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parts: [
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{ name: 'e', data: utils.mpNormalize(rsaParams['e'])},
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{ name: 'n', data: utils.mpNormalize(rsaParams['n'])},
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{ name: 'd', data: utils.mpNormalize(rsaParams['d'])},
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{ name: 'p', data: utils.mpNormalize(rsaParams['p'])},
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{ name: 'q', data: utils.mpNormalize(rsaParams['q'])},
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{ name: 'dmodp',
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data: utils.mpNormalize(rsaParams['dmodp'])},
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{ name: 'dmodq',
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data: utils.mpNormalize(rsaParams['dmodq'])},
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{ name: 'iqmp',
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data: utils.mpNormalize(rsaParams['iqmp'])}
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]
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};
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return (new PrivateKey(key));
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}
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function readDNSSECPrivateKey(alg, elements) {
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if (supportedAlgosById[alg].match(/^RSA-/)) {
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return (readDNSSECRSAPrivateKey(elements));
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}
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if (supportedAlgosById[alg] === 'ECDSA-P384-SHA384' ||
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supportedAlgosById[alg] === 'ECDSA-P256-SHA256') {
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var d = Buffer.from(elements[0].split(' ')[1], 'base64');
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var curve = 'nistp384';
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var size = 384;
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if (supportedAlgosById[alg] === 'ECDSA-P256-SHA256') {
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curve = 'nistp256';
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size = 256;
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}
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// DNSSEC generates the public-key on the fly (go calculate it)
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var publicKey = utils.publicFromPrivateECDSA(curve, d);
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var Q = publicKey.part['Q'].data;
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var ecdsaKey = {
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type: 'ecdsa',
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curve: curve,
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size: size,
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parts: [
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{name: 'curve', data: Buffer.from(curve) },
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{name: 'd', data: d },
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{name: 'Q', data: Q }
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]
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};
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return (new PrivateKey(ecdsaKey));
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}
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throw (new Error('Unsupported algorithm: ' + supportedAlgosById[alg]));
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}
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function dnssecTimestamp(date) {
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var year = date.getFullYear() + ''; //stringify
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var month = (date.getMonth() + 1);
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var timestampStr = year + month + date.getUTCDate();
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timestampStr += '' + date.getUTCHours() + date.getUTCMinutes();
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timestampStr += date.getUTCSeconds();
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return (timestampStr);
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}
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function rsaAlgFromOptions(opts) {
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if (!opts || !opts.hashAlgo || opts.hashAlgo === 'sha1')
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return ('5 (RSASHA1)');
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else if (opts.hashAlgo === 'sha256')
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return ('8 (RSASHA256)');
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else if (opts.hashAlgo === 'sha512')
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return ('10 (RSASHA512)');
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else
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throw (new Error('Unknown or unsupported hash: ' +
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opts.hashAlgo));
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}
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function writeRSA(key, options) {
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// if we're missing parts, add them.
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if (!key.part.dmodp || !key.part.dmodq) {
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utils.addRSAMissing(key);
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}
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var out = '';
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out += 'Private-key-format: v1.3\n';
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out += 'Algorithm: ' + rsaAlgFromOptions(options) + '\n';
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var n = utils.mpDenormalize(key.part['n'].data);
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out += 'Modulus: ' + n.toString('base64') + '\n';
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var e = utils.mpDenormalize(key.part['e'].data);
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out += 'PublicExponent: ' + e.toString('base64') + '\n';
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var d = utils.mpDenormalize(key.part['d'].data);
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out += 'PrivateExponent: ' + d.toString('base64') + '\n';
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var p = utils.mpDenormalize(key.part['p'].data);
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out += 'Prime1: ' + p.toString('base64') + '\n';
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var q = utils.mpDenormalize(key.part['q'].data);
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out += 'Prime2: ' + q.toString('base64') + '\n';
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var dmodp = utils.mpDenormalize(key.part['dmodp'].data);
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out += 'Exponent1: ' + dmodp.toString('base64') + '\n';
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var dmodq = utils.mpDenormalize(key.part['dmodq'].data);
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out += 'Exponent2: ' + dmodq.toString('base64') + '\n';
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var iqmp = utils.mpDenormalize(key.part['iqmp'].data);
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out += 'Coefficient: ' + iqmp.toString('base64') + '\n';
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// Assume that we're valid as-of now
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var timestamp = new Date();
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out += 'Created: ' + dnssecTimestamp(timestamp) + '\n';
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out += 'Publish: ' + dnssecTimestamp(timestamp) + '\n';
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out += 'Activate: ' + dnssecTimestamp(timestamp) + '\n';
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return (Buffer.from(out, 'ascii'));
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}
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function writeECDSA(key, options) {
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var out = '';
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out += 'Private-key-format: v1.3\n';
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if (key.curve === 'nistp256') {
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out += 'Algorithm: 13 (ECDSAP256SHA256)\n';
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} else if (key.curve === 'nistp384') {
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out += 'Algorithm: 14 (ECDSAP384SHA384)\n';
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} else {
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throw (new Error('Unsupported curve'));
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}
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var base64Key = key.part['d'].data.toString('base64');
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out += 'PrivateKey: ' + base64Key + '\n';
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// Assume that we're valid as-of now
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var timestamp = new Date();
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out += 'Created: ' + dnssecTimestamp(timestamp) + '\n';
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out += 'Publish: ' + dnssecTimestamp(timestamp) + '\n';
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out += 'Activate: ' + dnssecTimestamp(timestamp) + '\n';
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return (Buffer.from(out, 'ascii'));
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}
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function write(key, options) {
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if (PrivateKey.isPrivateKey(key)) {
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if (key.type === 'rsa') {
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return (writeRSA(key, options));
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} else if (key.type === 'ecdsa') {
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return (writeECDSA(key, options));
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} else {
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throw (new Error('Unsupported algorithm: ' + key.type));
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}
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} else if (Key.isKey(key)) {
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/*
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* RFC3110 requires a keyname, and a keytype, which we
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* don't really have a mechanism for specifying such
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* additional metadata.
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*/
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throw (new Error('Format "dnssec" only supports ' +
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'writing private keys'));
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} else {
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throw (new Error('key is not a Key or PrivateKey'));
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}
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}
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