Question

Task 4: Encrypting User Password

# usermod -L newuser1

# chage -d 0 newuser1

# grep newuser1 /etc/shadow

What is the purpose of usermod and chage command?

_____________________________________________________________________________________ _____________________________

# rpm -q python If python

if python is not installed, then enter

# yum install python

# python

>>> import crypt;print crypt.crypt ("password123","solutions")

>>>

Press CTRL d to exit

Use the mouse to copy the encrypted string.

# usermod -p <paste encrypted string here> newuser1

The angle brackets (< and >) are NOT part of the string!

# grep newuser1 /etc/shadow

# usermod -U newuser1

# usermod -s /bin/bash newuser1

Log on as newuser1

Can you log on? What password are going to use? _____________________________________________________________________________________????????

Answer 1

usermod command is used on existing user accounts
only root user is allowed to execute this command
usermod command is used to make changes in the existing users. like to modify home directory , change group , change login name lock user unlock users etc

chage (change user password expiry information)

chage -l madhav

Last password change                   : Nov 02, 2019
Password expires                   : never
Password inactive                   : never
Account expires                       : Dec 01, 2019
Minimum number of days between password change       : 0
Maximum number of days between password change       : 99999
Number of days of warning before password expires   : 7

The expiry status of a 'madhav' user is Dec 1 2019, let's change it to Nov 1 2019 using 'usermod -e' option and confirm the expiry date with 'chage' command.

# usermod -e 2019-11-01 madhav
# chage -l madhav

Last password change                   : Nov 02, 2019
Password expires                   : never
Password inactive                   : never
Account expires                       : Nov 01, 2019
Minimum number of days between password change       : 0
Maximum number of days between password change       : 99999
Number of days of warning before password expires   : 7

encrypted password soHDZyOkM1YIE
plaintext password password123

used for login password123

i have used user1 account instead of newuser1 account as it was not created in me but user1 was exist so i done on that account.

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