%PDF-
%PDF-
Mini Shell
Mini Shell
// 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'));
}
}
Zerion Mini Shell 1.0