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262 lines
6.8 KiB
262 lines
6.8 KiB
// Copyright 2015 Joyent, Inc.
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module.exports = {
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read: read,
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readSSHPrivate: readSSHPrivate,
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write: write
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};
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var assert = require('assert-plus');
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var asn1 = require('asn1');
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var Buffer = require('safer-buffer').Buffer;
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var algs = require('../algs');
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var utils = require('../utils');
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var crypto = require('crypto');
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var Key = require('../key');
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var PrivateKey = require('../private-key');
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var pem = require('./pem');
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var rfc4253 = require('./rfc4253');
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var SSHBuffer = require('../ssh-buffer');
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var errors = require('../errors');
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var bcrypt;
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function read(buf, options) {
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return (pem.read(buf, options));
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}
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var MAGIC = 'openssh-key-v1';
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function readSSHPrivate(type, buf, options) {
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buf = new SSHBuffer({buffer: buf});
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var magic = buf.readCString();
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assert.strictEqual(magic, MAGIC, 'bad magic string');
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var cipher = buf.readString();
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var kdf = buf.readString();
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var kdfOpts = buf.readBuffer();
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var nkeys = buf.readInt();
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if (nkeys !== 1) {
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throw (new Error('OpenSSH-format key file contains ' +
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'multiple keys: this is unsupported.'));
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}
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var pubKey = buf.readBuffer();
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if (type === 'public') {
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assert.ok(buf.atEnd(), 'excess bytes left after key');
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return (rfc4253.read(pubKey));
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}
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var privKeyBlob = buf.readBuffer();
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assert.ok(buf.atEnd(), 'excess bytes left after key');
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var kdfOptsBuf = new SSHBuffer({ buffer: kdfOpts });
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switch (kdf) {
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case 'none':
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if (cipher !== 'none') {
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throw (new Error('OpenSSH-format key uses KDF "none" ' +
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'but specifies a cipher other than "none"'));
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}
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break;
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case 'bcrypt':
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var salt = kdfOptsBuf.readBuffer();
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var rounds = kdfOptsBuf.readInt();
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var cinf = utils.opensshCipherInfo(cipher);
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if (bcrypt === undefined) {
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bcrypt = require('bcrypt-pbkdf');
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}
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if (typeof (options.passphrase) === 'string') {
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options.passphrase = Buffer.from(options.passphrase,
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'utf-8');
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}
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if (!Buffer.isBuffer(options.passphrase)) {
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throw (new errors.KeyEncryptedError(
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options.filename, 'OpenSSH'));
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}
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var pass = new Uint8Array(options.passphrase);
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var salti = new Uint8Array(salt);
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/* Use the pbkdf to derive both the key and the IV. */
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var out = new Uint8Array(cinf.keySize + cinf.blockSize);
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var res = bcrypt.pbkdf(pass, pass.length, salti, salti.length,
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out, out.length, rounds);
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if (res !== 0) {
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throw (new Error('bcrypt_pbkdf function returned ' +
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'failure, parameters invalid'));
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}
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out = Buffer.from(out);
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var ckey = out.slice(0, cinf.keySize);
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var iv = out.slice(cinf.keySize, cinf.keySize + cinf.blockSize);
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var cipherStream = crypto.createDecipheriv(cinf.opensslName,
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ckey, iv);
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cipherStream.setAutoPadding(false);
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var chunk, chunks = [];
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cipherStream.once('error', function (e) {
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if (e.toString().indexOf('bad decrypt') !== -1) {
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throw (new Error('Incorrect passphrase ' +
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'supplied, could not decrypt key'));
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}
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throw (e);
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});
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cipherStream.write(privKeyBlob);
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cipherStream.end();
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while ((chunk = cipherStream.read()) !== null)
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chunks.push(chunk);
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privKeyBlob = Buffer.concat(chunks);
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break;
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default:
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throw (new Error(
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'OpenSSH-format key uses unknown KDF "' + kdf + '"'));
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}
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buf = new SSHBuffer({buffer: privKeyBlob});
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var checkInt1 = buf.readInt();
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var checkInt2 = buf.readInt();
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if (checkInt1 !== checkInt2) {
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throw (new Error('Incorrect passphrase supplied, could not ' +
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'decrypt key'));
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}
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var ret = {};
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var key = rfc4253.readInternal(ret, 'private', buf.remainder());
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buf.skip(ret.consumed);
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var comment = buf.readString();
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key.comment = comment;
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return (key);
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}
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function write(key, options) {
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var pubKey;
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if (PrivateKey.isPrivateKey(key))
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pubKey = key.toPublic();
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else
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pubKey = key;
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var cipher = 'none';
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var kdf = 'none';
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var kdfopts = Buffer.alloc(0);
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var cinf = { blockSize: 8 };
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var passphrase;
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if (options !== undefined) {
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passphrase = options.passphrase;
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if (typeof (passphrase) === 'string')
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passphrase = Buffer.from(passphrase, 'utf-8');
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if (passphrase !== undefined) {
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assert.buffer(passphrase, 'options.passphrase');
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assert.optionalString(options.cipher, 'options.cipher');
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cipher = options.cipher;
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if (cipher === undefined)
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cipher = 'aes128-ctr';
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cinf = utils.opensshCipherInfo(cipher);
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kdf = 'bcrypt';
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}
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}
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var privBuf;
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if (PrivateKey.isPrivateKey(key)) {
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privBuf = new SSHBuffer({});
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var checkInt = crypto.randomBytes(4).readUInt32BE(0);
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privBuf.writeInt(checkInt);
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privBuf.writeInt(checkInt);
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privBuf.write(key.toBuffer('rfc4253'));
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privBuf.writeString(key.comment || '');
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var n = 1;
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while (privBuf._offset % cinf.blockSize !== 0)
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privBuf.writeChar(n++);
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privBuf = privBuf.toBuffer();
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}
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switch (kdf) {
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case 'none':
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break;
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case 'bcrypt':
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var salt = crypto.randomBytes(16);
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var rounds = 16;
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var kdfssh = new SSHBuffer({});
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kdfssh.writeBuffer(salt);
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kdfssh.writeInt(rounds);
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kdfopts = kdfssh.toBuffer();
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if (bcrypt === undefined) {
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bcrypt = require('bcrypt-pbkdf');
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}
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var pass = new Uint8Array(passphrase);
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var salti = new Uint8Array(salt);
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/* Use the pbkdf to derive both the key and the IV. */
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var out = new Uint8Array(cinf.keySize + cinf.blockSize);
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var res = bcrypt.pbkdf(pass, pass.length, salti, salti.length,
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out, out.length, rounds);
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if (res !== 0) {
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throw (new Error('bcrypt_pbkdf function returned ' +
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'failure, parameters invalid'));
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}
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out = Buffer.from(out);
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var ckey = out.slice(0, cinf.keySize);
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var iv = out.slice(cinf.keySize, cinf.keySize + cinf.blockSize);
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var cipherStream = crypto.createCipheriv(cinf.opensslName,
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ckey, iv);
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cipherStream.setAutoPadding(false);
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var chunk, chunks = [];
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cipherStream.once('error', function (e) {
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throw (e);
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});
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cipherStream.write(privBuf);
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cipherStream.end();
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while ((chunk = cipherStream.read()) !== null)
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chunks.push(chunk);
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privBuf = Buffer.concat(chunks);
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break;
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default:
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throw (new Error('Unsupported kdf ' + kdf));
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}
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var buf = new SSHBuffer({});
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buf.writeCString(MAGIC);
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buf.writeString(cipher); /* cipher */
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buf.writeString(kdf); /* kdf */
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buf.writeBuffer(kdfopts); /* kdfoptions */
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buf.writeInt(1); /* nkeys */
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buf.writeBuffer(pubKey.toBuffer('rfc4253'));
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if (privBuf)
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buf.writeBuffer(privBuf);
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buf = buf.toBuffer();
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var header;
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if (PrivateKey.isPrivateKey(key))
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header = 'OPENSSH PRIVATE KEY';
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else
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header = 'OPENSSH PUBLIC KEY';
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var tmp = buf.toString('base64');
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var len = tmp.length + (tmp.length / 70) +
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18 + 16 + header.length*2 + 10;
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buf = Buffer.alloc(len);
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var o = 0;
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o += buf.write('-----BEGIN ' + header + '-----\n', o);
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for (var i = 0; i < tmp.length; ) {
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var limit = i + 70;
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if (limit > tmp.length)
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limit = tmp.length;
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o += buf.write(tmp.slice(i, limit), o);
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buf[o++] = 10;
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i = limit;
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}
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o += buf.write('-----END ' + header + '-----\n', o);
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return (buf.slice(0, o));
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}
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