domotz-remote-pawn/src/utils/SSHInformation.js

Domotz Agent

var SSHInfo = {};
var noOutput = {};
var childProcess = require('child_process');
const versionsRegex = /OpenSSH_(\d+\.\d+p\d+).+OpenSSL\s+(\d+\.\d+(?:\.\d+)?)/;

function parseStdOut(data, stdout, logger) {
    if (!data) {
        return noOutput;
    }
    logger.debug('Parsing SSH Information: %s', data);
    try {
        var matches = data.match(versionsRegex);
        if (!matches[1] || !matches[2]) {
            return noOutput;
        }
        SSHInfo.openssh = matches[1].replace('p', '.');
        SSHInfo.openssl = matches[2];
    } catch (e) {
        logger.error('Error parsing SSH Information: %s', e);
        return noOutput;
    }

    const sections = stdout.trim().split(/\n(?=KEX|KEY|CIPHER|MAC)/);

    sections.forEach(function (section)  {
        const lines = section.trim().split('\n');
        const category = lines[0];
        SSHInfo[category] = lines.slice(1);
        logger.debug('SSH Info %s: %s', category, JSON.stringify(SSHInfo[category]));;
    });

    return SSHInfo;
}

function getSSHInformation(logger, shell) {
    var options = {};
    if (shell) {
        options.shell = shell;
    }
    var q = require('q');
    const command = 'ssh -V && echo KEX && ssh -Q kex && echo KEY && ssh -Q key && echo CIPHER && ssh -Q cipher && echo MAC && ssh -Q mac';
    var deferred = q.defer();
        childProcess.exec(command, options, function (err, stdout, stderr) {
            if (err) {
                deferred.resolve({});
            } else {
                deferred.resolve(parseStdOut(stderr, stdout, logger));
            }
        });
    return deferred.promise;
}

module.exports.getSSHInformation = getSSHInformation;