How to Enable Password Authentication in AWS ec2 Instances

The configuration to enable password authentication in AWS instance:-

1. Log in to the server using ssh client of your choice using
   the private key.
   

   ssh -i your-key.pem username@ip_address
   

2. Set up a password for the user using passwd command along
   with the username.
   

   sudo passwd ec2-user # If machine is Amazon Linux
   sudo passwd ubuntu # If machine is Ubuntu
   

3. Open the sshd_config file.
   

   sudo vi /etc/ssh/sshd_config
   

4. Find the Line containing "PasswordAuthentication" parameter
   
   and change its value from "no" to "yes"
   PasswordAuthentication yes
   If you want to set up "root" login, find "PermitRootLogin"
   parameter and change its value from prohibit-password
   to "yes".

5. Now, restart the "sshd" service using the following
   command.
   

   sudo service sshd restart
   

6. Now you can log out and log in using the password you set
   for the user.
   

   ssh ec2-user@ip_address
   # ssh ubuntu@15.1.25.40
   

Note: Although password will be encrypted while communicating with server but it is not recommended to enable the password authentication to connect with EC2 machines using ssh. Easy and common password can be guessed easily using brute force by some malicious user.