#SECURE PASSWORD REPOSITORY LINUX UPDATE#
While NIST no longer recommends rotating passwords, many organizations still are required by their security policies.It’s generally recommended that you update your password once a month. The primary reason for doing so is to avoid account compromise, and ensure that only authorized users are the ones using credentials to log in. To unlock Jack’s account run the command:Ī security practice often recommended is the regular rotation of users’ passwords. To unlock an account, pass the -u option as follows: This is the exact opposite of locking a user’s account. To deactivate the password or lock the account, use the -l option as follows:įor instance, to lock Jack’s account and prevent him from logging in, execute the command: This prevents the user from accessing or logging into their account. The best approach to take is to lock the account or deactivate the password. Picture a situation where you have an employee who has been offboarded and you are required to deactivate their account.
You can also change your own password by simply running the command without any arguments. To change the user’s password simply execute the command: If you are logged in as a sudo user, you need to invoke sudo before the command as follows: The syntax for creating or changing a password takes the following format: For some Linux flavors such as CentOS, RHEL, and Fedora, you need to invoke the passwd command to specify the user’s password. It allows you to specify the username and password, alongside other details. On Debian/Ubuntu systems, the adduser command walks you through the creation of a new login user. Let’s have a glance at some of the operations you can carry out using the passwd command. The command can be used to perform a wide range of password management operations. One of the commands used in managing passwords is the Linux passwd command. Manage Passwords Using the passwd Command This tutorial sheds light on some of the ways you can manage passwords on a Linux system. Password management is, therefore, one of the top-of-mind tasks that any system administrator should carry out. Weak and easily guessable passwords such as “Password123” can also present a security risk, and are often a consequence of password fatigue. Passwords can also be forgotten which means that users get locked out of the system. However, unlike public key authentication, passwords are prone to breaches such as brute force attacks that can be executed using automated scripts. It’s one of the few authentication methods supported by the SSH protocol besides public key authentication, which requires admins to create a key pair (public and private key) to authenticate a user with a remote system. I hope you got an idea how we can use encrypted password inside a shell script.Using a password with an associated user account is the primary method of authentication in Linux and most UNIX systems. Kern :err : ] *ERROR* \Ībove output confirms that script is able to capture output of dmesg command. Kern :info : RAS: Correctable Errors collector\ Let’s verify the contents of /tmp/a.tmp file, ~]$ cat /tmp/a.tmp Perfect, above output confirms that encrypted is decrypted during the execution. + sshpass -p #2 ssh -o StrictHostKe圜hecking=no \ Now run the script to verify whether encrypted is successfully used to connect to remote system. Make the script executable by running beneath command, $ chmod +x sample.sh
Sshpass -p $PASSWD ssh -o StrictHostKe圜hecking=no $REMOTE \
PASSWD=`cat secret.txt | openssl enc -aes-256-cbc -md sha512 -a -d -pbkdf2 \ Use the below sample shell script which will use encrypted password while connecting to remote system over ssh. Use Encrypted Password in Bash Shell Script Note: If you have noticed carefully, we have used ‘-d’ option to decrypt. To decrypt the password, run below $ cat secret.txt | openssl enc -aes-256-cbc -md sha512 -a -d -pbkdf2 -iter 100000 \ Set the following permissions on secret.txt file using chmod command, $ chmod 600 secret.txt Decrypt Encrypted Password Using Openssl To save the encrypted password to a file use the following command, $ echo " #2" | openssl enc -aes-256-cbc -md sha512 -a -pbkdf2 -iter 100000 \
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