node-red/red/runtime/storage/localfilesystem/projects/ssh/keygen.js

/**
 * Copyright JS Foundation and other contributors, http://js.foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

var child_process = require('child_process');

var sshkeygenCommand = "ssh-keygen";

var log;

function runSshKeygenCommand(args,cwd,env) {
    return new Promise(function(resolve, reject) {
        console.log("Spawning command",args);
        try {
            var child = child_process.spawn(sshkeygenCommand, args, {cwd: cwd, detached: true, env: env});
            var stdout = "";
            var stderr = "";

            child.stdout.on('data', function(data) {
                stdout += data;
            });
            child.stderr.on('data', function(data) {
                stderr += data;
            });
            child.on('close', function(code, signal) {
                console.log("sshKeyGen closed",code);
                console.log("sshKeyGen",stdout);
                console.log("sshKeyGen",stderr);
                if (code !== 0) {
                    var err = new Error(stderr);
                    err.stdout = stdout;
                    err.stderr = stderr;
                    if (/passphrase is too short/.test(stderr)) {
                        err.code = "key_passphrase_too_short";
                    } else if(/Key must at least be 1024 bits/.test(stderr)) {
                        err.code = "key_length_too_short";
                    }
                    reject(err);
                }
                else {
                    resolve(stdout);
                }
            });
        } catch(err) {
            console.log("Threw error",err);
            reject(err);
        }
    });
}

function init(_settings, _runtime) {
    log = _runtime.log;
}

function generateKey(options) {
    var args = ['-q', '-t', 'rsa'];
    if (options.size) {
        args.push('-b', options.size);
    }
    if (options.location) {
        args.push('-f', options.location);
    }
    if (options.comment) {
        args.push('-C', options.comment);
    }
    if (options.password) {
        args.push('-N', options.password);
    }
    return runSshKeygenCommand(args,__dirname);
}

module.exports = {
    init: init,
    generateKey: generateKey,
};