cloudron-box/src/blobs.js

/* jslint node:true */

'use strict';

exports = module.exports = {
    get,
    set,

    initSecrets,

    ACME_ACCOUNT_KEY: 'acme_account_key',
    ADDON_TURN_SECRET: 'addon_turn_secret',
    DHPARAMS: 'dhparams',
    SFTP_PUBLIC_KEY: 'sftp_public_key',
    SFTP_PRIVATE_KEY: 'sftp_private_key',

    _clear: clear
};

const assert = require('assert'),
    BoxError = require('./boxerror.js'),
    constants = require('./constants.js'),
    crypto = require('crypto'),
    database = require('./database.js'),
    debug = require('debug')('box:blobs'),
    paths = require('./paths.js'),
    safe = require('safetydance');

const BLOBS_FIELDS = [ 'id', 'value' ].join(',');

async function get(id) {
    assert.strictEqual(typeof id, 'string');

    const result = await database.query(`SELECT ${BLOBS_FIELDS} FROM blobs WHERE id = ?`, [ id ]);
    if (result.length === 0) return null;
    return result[0].value;
}

async function set(id, value) {
    assert.strictEqual(typeof id, 'string');
    assert(value === null || Buffer.isBuffer(value));

    await database.query('INSERT INTO blobs (id, value) VALUES (?, ?) ON DUPLICATE KEY UPDATE value=VALUES(value)', [ id, value ]);
}

async function clear() {
    await database.query('DELETE FROM blobs');
}

async function initSecrets() {
    let value = await get(exports.ACME_ACCOUNT_KEY);
    if (!value) {
        const accountKeyPem = safe.child_process.execSync('openssl genrsa 4096');
        if (!accountKeyPem) throw new BoxError(BoxError.OPENSSL_ERROR, `Could not generate acme account key: ${safe.error.message}`);
        await set(exports.ACME_ACCOUNT_KEY, accountKeyPem);
    }

    value = await get(exports.ADDON_TURN_SECRET);
    if (!value) {
        const secret = 'a' + crypto.randomBytes(15).toString('hex'); // prefix with a to ensure string starts with a letter
        await set(exports.ADDON_TURN_SECRET, Buffer.from(secret));
    }

    value = await get(exports.DHPARAMS);
    if (!constants.TEST && !value) {
        debug('initSecrets: generating dhparams.pem. this takes forever');
        const dhparams = safe.child_process.execSync('openssl dhparam 2048');
        if (!dhparams) throw new BoxError(BoxError.OPENSSL_ERROR, safe.error);
        if (!safe.fs.writeFileSync(paths.DHPARAMS_FILE, dhparams)) throw new BoxError(BoxError.FS_ERROR, `Could not save dhparams.pem: ${safe.error.message}`);
        await set(exports.DHPARAMS, dhparams);
    }

    value = await get(exports.SFTP_PRIVATE_KEY);
    if (!value) {
        debug('initSecrets: generate sftp keys');
        if (constants.TEST) {
            safe.fs.unlinkSync(`${paths.SFTP_KEYS_DIR}/ssh_host_rsa_key.pub`);
            safe.fs.unlinkSync(`${paths.SFTP_KEYS_DIR}/ssh_host_rsa_key`);
        }
        if (!safe.child_process.execSync(`ssh-keygen -m PEM -t rsa -f "${paths.SFTP_KEYS_DIR}/ssh_host_rsa_key" -q -N ""`)) throw new BoxError(BoxError.OPENSSL_ERROR, `Could not generate sftp ssh keys: ${safe.error.message}`);
        const publicKey = safe.fs.readFileSync(`${paths.SFTP_KEYS_DIR}/ssh_host_rsa_key.pub`);
        await set(exports.SFTP_PUBLIC_KEY, publicKey);
        const privateKey = safe.fs.readFileSync(`${paths.SFTP_KEYS_DIR}/ssh_host_rsa_key`);
        await set(exports.SFTP_PRIVATE_KEY, privateKey);
    }
}