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/**

* BOSSS XDR API RESTful

* Copyright (C) 2015-2020 Wazuh, Inc. All rights reserved.

* Wazuh.com

*

* This program is a free software; you can redistribute it

* and/or modify it under the terms of the GNU General Public

* License (version 2) as published by the FSF - Free Software

* Foundation.

*/

if (process.getuid() !== 0){

console.log('A root user is required to start the API.');

process.exit(1);

}

/********************************************/

/* Root actions

/********************************************/

try {

var auth = require("http-auth");

} catch (e) {

console.log("Dependencies not found. Try 'npm install' in /var/ossec/api. Exiting...");

process.exit(1);

}

const check = require('./helpers/check');

// Get configuration

config = require('./configuration/config');

if (check.configuration_file() < 0) {

setTimeout(function(){ process.exit(1); }, 500);

return;

}

// Get credentials

if (config.basic_auth.toLowerCase() == "yes"){

var auth_secure = auth.basic({

realm: "OSSEC API",

file: __dirname + "/configuration/auth/user"

});

}

// Get Certs

var options = {};

var fs = require('fs');

if (config.https.toLowerCase() == "yes"){

var api_route = config.ossec_path + '/api/';

var option_paths = {};

// Cert and key

option_paths.key = config.https_key || 'configuration/ssl/server.key';

if (option_paths.key.charAt(0) != '/'){

option_paths.key = api_route + option_paths.key;

}

option_paths.cert = config.https_cert || 'configuration/ssl/server.crt';

if (option_paths.cert.charAt(0) != '/'){

option_paths.cert = api_route + option_paths.cert;

}

options.key = fs.readFileSync(option_paths.key);

options.cert = fs.readFileSync(option_paths.cert);

// CA

var use_ca = config.https_use_ca || 'no';

if (use_ca.toLowerCase() == "yes"){

option_paths.ca = config.https_ca || 'configuration/ssl/ca.crt';

if (option_paths.ca.charAt(0) != '/'){

option_paths.ca = api_route + option_paths.ca;

}

options.ca = fs.readFileSync(option_paths.ca);

}

if (config.secureProtocol && config.secureProtocol != "") options.secureProtocol = config.secureProtocol;

if (config.ciphers && config.ciphers != "") options.ciphers = config.ciphers;

if (config.honorCipherOrder) options.honorCipherOrder = config.honorCipherOrder;

if (config.secureOptions) options.secureOptions = config.secureOptions;

}

/********************************************/

/* Drop privileges

/********************************************/

if (config.drop_privileges || config.drop_privileges == undefined) {

try {

process.setgid('ossec');

process.setuid('ossec');

} catch(err) {

console.log('Drop privileges failed: ' + err.message);

process.exit(1);

}

}

/********************************************/

/* Modules, vars and global vars

/********************************************/

try {

var express = require('express');

var bodyParser = require('body-parser');

var cors = require('cors')

var moment = require('moment');

res_h = require('./helpers/response_handler');

logger = require('./helpers/logger');

} catch (e) {

console.log("Dependencies not found. Try 'npm install' in /var/ossec/api. Exiting...");

process.exit(1);

}

api_path = __dirname;

python_bin = config.ossec_path + '/framework/python/bin/python3';

/********************************************/

/* Config APP

/********************************************/

info_package = require('./package.json');

var version_mmp = info_package.version.split('.'); // major.minor.patch

var current_mm_version = version_mmp[0] + '.' + version_mmp[1]; // major.minor

if (process.argv.length == 3 && process.argv[2] == "-f")

logger.set_foreground();

if (check.wazuh(logger) < 0) {

setTimeout(function(){ process.exit(1); }, 500);

return;

}

var port = process.env.PORT || config.port;

if (config.host != "0.0.0.0")

var host = config.host;

var app = express();

// CORS

if (config.cors.toLowerCase() == "yes"){

app.use(cors());

}

// Basic authentication

if (config.basic_auth.toLowerCase() == "yes"){

app.use(auth.connect(auth_secure));

auth_secure.on('fail', (result, req) => {

logger.set_user(result.user);

var log_msg = "[" + req.connection.remoteAddress + "] " + "User: \"" + result.user + "\" - Authentication failed.";

logger.log(log_msg);

});

auth_secure.on('error', (error, req) => {

logger.set_user("");

var log_msg = "[" + req.connection.remoteAddress + "] Authentication error: " + error.code + " - " + error.message;

logger.log(log_msg);

});

}

// temporary

if (config.ld_library_path) {

logger.warning("LD library path configuration is deprecated.");

}

if (config.python) {

logger.warning("Python configuration is deprecated. Using " + python_bin);

}

// Body

app.use(bodyParser.json());

app.use(bodyParser.urlencoded({extended: true}));

app.use(bodyParser.text({type:"application/xml", limit:"10mb"}));

app.use(bodyParser.raw({type:"application/octet-stream", limit:"10mb"}));

/**

* Check Wazuh app version

* Using: Header: "wazuh-app-version: X.Y.Z"

*/

app.use(function(req, res, next) {

var go_next = true;

var app_version_header = req.get('wazuh-app-version');

var regex_version = /^\d+\.\d+\.\d+$/i;

if (typeof app_version_header != 'undefined'){

if (!regex_version.test(app_version_header)){

go_next = false;

res_h.bad_request(req, res, 801);

}

else{

var app_version_mmp = app_version_header.split('.'); // major.minor.patch

var app_mm_version = app_version_mmp[0] + '.' + app_version_mmp[1]; // major.minor

if (app_mm_version != current_mm_version){

go_next = false;

res_h.bad_request(req, res, 802, "Expected version '" + current_mm_version + ".x', and found '" + app_mm_version + ".x'.");

}

}

}

if (go_next)

next();

});

// Controllers

app.use("/", require('./controllers'));

// APP Errors

app.use (function (err, req, res, next){

if ( err == "Error: invalid json" ){

logger.debug(req.connection.remoteAddress + " " + req.method + " " + req.path);

res_h.bad_request(req, res, 607);

}

else if ('status' in err && err.status == 400){

var msg = "";

if ('body' in err)

msg = "Body is not correct.";

res_h.bad_request(req, res, 614, msg);

}

else if (err == "PayloadTooLargeError: request entity too large"){

res_h.bad_request(req, res, 701);

}

else{

logger.log("Internal Error");

if(err.stack)

logger.log(err.stack);

logger.log("Exiting...");

setTimeout(function(){ process.exit(1); }, 500);

}

});

/********************************************/

/* Create server

/********************************************/

if (config.https.toLowerCase() == "yes"){

var https = require('https');

var server = https.createServer(options, app).listen(port, host, function(){

logger.log("Listening on: https://" + server.address().address + ":" + port);

});

}

else{

var http = require('http');

var server = http.createServer(app).listen(port, host, function(){

logger.log("Listening on: http://" + server.address().address + ":" + port);

});

}

/********************************************/

/* Event handler

/********************************************/

process.on('uncaughtException', function(err) {

if (err.errno == "EADDRINUSE")

logger.log("Error: Address in use (port " + port + "): Close the program using that port or change the port.")

else {

logger.log("Internal Error: uncaughtException");

if(err.stack)

logger.log(err.stack);

}

logger.log("Exiting...");

setTimeout(function(){ process.exit(1); }, 500);

});

process.on('SIGTERM', function() {

logger.log("Exiting... (SIGTERM)");

setTimeout(function(){ process.exit(1); }, 500);

});

process.on('SIGINT', function() {

logger.log("Exiting... (SIGINT)");

setTimeout(function(){ process.exit(1); }, 500);

});