mysqli connection db user and password settings - php

Question

i am trying to figure out if there is a way to make a password recovery system that actually hides the "connection.php" with all the mysqli db username and password. is this possible?
most of the tutorials i found have the "connection.php" file shown to make the connection to the database and it can be viewed from source which makes the the database login info visible. can someone help me with this or point me in the right direction to go about this please?
example:
<?php
$connection = mysqli_connect('localhost', 'root', 'Rvm#i[9)0?~=');
if (!$connection){
die("Database Connection Failed" . mysqli_error($connection));
}
$select_db = mysqli_select_db($connection, 'pixelw3p_demo');
if (!$select_db){
die("Database Selection Failed" . mysqli_error($connection));
}
?>
this is in the connection.php file which needs to be added as a
require_once('connection.php');
now this php file can be seen in the source then you know which php file to look for to get the database info. any way all of this can be hidden so my db isn't vulnerable?

Answer 1

To put it straight: there is absolutely nothing wrong in having credentials in a PHP file. What everyone is talking about is "NEVER store passwords, API keys, or other sensitive information" in a file included in the version control (e.g. git).
A PHP file by itself is no worse than ENV, INI, JSON, XML, YAML or whatever. Actually a PHP file is even slightly better, as it doesn't need to be put strictly above the document root. And also, using PHP for the configuration allows a better integration with your application.
Whereas what is really essential, is having all the application settings in a separate file with which is removed from the version control, so it will never make it into a repository or another server.
Given all the above, to make your configuration file separated from the source code:
add the config.php line in .gitignore (in case you are using git)
create a file called config.sample.php with all variables set to empty values like this
return [
'db' => [
'host' => '127.0.0.1',
'username' => '',
'password' => '',
'dbname' => '',
'port' => 3306,
],
];
add it to the version control
in your application bootstrap file have a code like this
if (!file_exists('config.php'))
{
throw new \Exception('Create config.php based on config.sample.php');
}
$config = require 'config.php';
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli(...$config['db']);
$mysqli->set_charset('utf8mb4');
then, as suggested, create config.php on the every server your application runs, each with its own set of values
What you have to understand, this routine is obligatory for any file format, config.ini icluded. And it's this routine that makes your passwords secure and portable, not a file format you choose.

Answer 2

To be blunt, most of the tutorials you've found are probably absolute garbage and everything they're telling you is wrong. Few of them actually address serious security concerns, and those that do usually either gloss over it, or fail to address the issues by promoting best practices.
It's not hard, but it can be tricky to do right. You need to keep in mind a bunch of things.
NEVER store passwords, API keys, or other sensitive information in your source code. Use configuration files, especially simple ones in INI, JSON or even XML format. PHP has functions for reading all of these quickly and easily.
NEVER store configuration files in a place that's within your public "web root", that is a place that could be accessed by someone tinkering with the URL to probe for files like these. Even if you have rules in your web server configuration to block these requests those rules might be disabled by accident, a problem that often manifests when you redeploy your application to a new server that isn't configured correctly.
NEVER check your production configuration files into version control. This is how you leak API keys and passwords to would be attackers. For instance, accidentally pushing an Amazon AWS key to a public GitHub repository is often swiftly punished by someone who will use that key to spin up hundreds of expensive instances. It doesn't matter if repositories are private: These can be cloned by people and made public without your knowledge.
ALWAYS do what you can to minimize the number of places where critical passwords, API keys and other credentials are stored. Use a secure storage system like 1Password as a "vault" where the contents are properly and thoroughly encrypted, not something like a Google Doc which could be compromised.
ALWAYS burn all passwords, API keys, and other credentials stored on a server in the event of a compromise. If you don't know how much access had or how long they've had access, re-issue new passwords, generate new API keys, and be absolutely certain the old credentials no longer work. Do not assume you have time to fix this. You might not. Immediately and permanently fix the problem when you realize you've got an issue.
The simplest answer here is to make a config.ini file with this information in it that's saved outside the web root and kept only on the server. Don't download it. Don't copy it. Don't touch it unless you need to. This helps avoid costly, painful mistakes.

Answer 3

A .htaccess file is usually impossible to display in browsers, but mind that depends on webserver settings. It's the default in Apache, and also in NGINX (where a .htaccess file has no functionality), but be very aware other webservers could have other defaults, and may display the contents of a .htaccess.
Contrary: a php.ini file is usually not configured to be rejected at HTTP requests!
Also if PHP processing fails, you end up with credentials in plaintext.
Anyway, I consider the .htaccess method as reliable as using htpasswd for authentication or limiting access.
In Apache's .htaccess this works:
php_value mysqli.default_host localhost
php_value mysqli.default_user obelix
php_value mysqli.default_pw zKSIOSwjsiyw9263djcaleP982WLdDU3kzn6
php_value mysqli.default_db broccoli
Then in PHP it's as easy as:
$db = mysqli_connect();
$db->select_db('menhirdb');
It's anyway better than storing credentials in sourcecode.
If you think your webserver performance sucks because a .htaccess is read line by line at each HTTP query, than you better put it in httpd.conf
That's anyway the way I would do it, but then like:
php_admin_value mysqli.default_host localhost
php_admin_value mysqli.default_user obelix
php_admin_value mysqli.default_pw zKSIOSwjsiyw9263djcaleP982WLdDU3kzn6
php_admin_value mysqli.default_db broccoli
The benefit of using 'php_admin_value' is automatically that .htaccess values can't overwrite them. Which is a great security benefit, I think. As I've witnessed more than once that vulnerable CMS systems wrote hostile .htaccess files.