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