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Articles taggués ‘password’

HowTo: Linux Check Password Strength With Cracklib-check Command

04/01/2019 Comments off

check password strengthUsing the same password on different servers allows attackers to access your accounts if cracker manage to steal your password from a less secure server. This is true for online website accounts too. So solution is to create unique passwords for server accounts like your email, sftp and ssh accounts. General guideline to create a strong and unique password is as follows:

Creating a strong and unique password for Linux or Unix-like systems

  1. Create a password with mix of numbers, special symbols, and alphabets.
  2. Make sure your password is hard to guess. You can use tool such as makepasswd to create hard to guess password.
  3. Do not use simple words like “password“, “123456“, “123abc” or “qwerty“.
  4. Use a unique password for all your server accounts.
  5. A minimum password length of 12 to 14 characters should be used. See how to configure CentOS / RHEL / Fedora Linux based server password quality requirements.
  6. Generating passwords randomly where feasible. You can do this with a simple shell scriptfunction.
  7. If possible use two-factor authentication.
  8. Use pam_crack to ensure strong passwords and to check passwords against a dictionary attack.

But, how do you test the effectiveness of a password in resisting guessing and brute-force attacks under Linux? The answer is simple use cracklib-check command.

Install cracklib on a Linux based system

Type the following yum command to install on RHEL and friends:
# yum install cracklib

Type the following apt-get command to install on Debian/Ubuntu and friends:
# apt-get install libcrack2

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Vous avez perdu le mot de passe root de MySQL ?

12/11/2018 Comments off

Que ce soit lors de la première installation ou après la perte du mot de passe principal de MySQL, il est nécessaire de pouvoir modifier le mot de passe administrateur (root) de MySQL.

Pour pouvoir modifier le mot de passe root de MySQL, il faut pouvoir s’y connecter, Or, si vous n’avez pas le mot de passe root actuel, vous vous retrouvez alors dans une situation kafkaïenne. Si vous connaissez le mot de passe actuel de MySQL et que vous souhaitez juste changer le mot de passe root, vous pouvez sauter cette étape ! Lire la suite…