Security issue: do not store LDAP passwords in MySQL database

[PunisherHD92]

Current status: when using LDAP authentication for Loganalyzer users, the password is stored in loganalyzer database is stored using md5 hash.
Firstly, the md5 hash is weak and can be bruteforced.
Secondly, the LDAP password should NOT be store in the database anyway.
This PR prevents loganalyzer storing the LDAP password in Mysql database.

[gemini-code-assist]

Summary of Changes

Hello @PunisherHD92, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request implements a critical security enhancement by stopping the practice of storing LDAP user passwords directly within the LogAnalyzer database. Previously, these passwords were hashed using MD5, which is considered a weak algorithm, and storing them at all for LDAP users is an unnecessary security risk. The change ensures that only necessary user information, excluding the LDAP password, is retained in the database.

Highlights

• Security Fix: Addresses a security vulnerability where LDAP user passwords were being stored in the LogAnalyzer database using a weak MD5 hash.
• Password Storage Prevention: Modifies the CheckLDAPUserLogin function to prevent the storage of LDAP passwords in the MySQL database by setting the $md5pass variable to an empty string.

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[gemini-code-assist]

Code Review

This pull request addresses a security vulnerability by preventing LDAP user passwords from being stored in the database. The change correctly replaces the password hashing logic with an empty string for the password field when an LDAP user is created in the local database. This effectively prevents the password from being stored. My review includes a suggestion to use a more conventional method for disabling password-based logins, which enhances clarity and robustness. Overall, this is a valuable security improvement.

[gemini-code-assist]

While setting the password to an empty string works, a more robust and conventional approach to disable password-based login for an account is to set the password hash to an invalid value that cannot be generated by the hashing algorithm. A common convention, for example in /etc/shadow files, is to use a single asterisk (*). This makes it clearer that password login is intentionally disabled and prevents any potential edge cases with empty strings.

	/* Don't store LDAP passwords in database, and disable login with local password */
	$md5pass = '*';