linux_wiki:change_passwords_and_adjust_password_aging_for_local_user_accounts [Owlbear Consulting

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====== Change Passwords And Adjust Password Aging For Local User Accounts ======

**General Information**

Account password management. 

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===== Important Files =====

Contains Default password aging
  * /etc/login.defs

\\
/etc/shadow fields
<code bash>
user:$6$O30OJMIu$EvINhwnNKNkuovMpHyyXpNmbBrlwqHCQguggwnAQhvkur01BhCZI/MwDY0z3kJqKwJoJgYEVVchEvsCIebN3o0:16475:0:99999:7:::
</code>

  * login
  * encrypted password
  * date of last password change (# days since Jan 1, 1970)
  * minimum password age (0 days above)
  * max password age (99999 days)
  * password warning period (7 days before max pw age)
  * password inactivity period (null/no enforcement, after max age, wait this long before user will not be given the opportunity to change password)
  * account expiration date (null/never expire)

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===== Commands =====

Change user password manually
<code bash>
passwd rjones
</code>
  * Will be prompted to enter new password twice

\\
List account age information (Same age info from /etc/passwd)
<code bash>
chage -l rjones
</code>

\\
Force user to change password on next login (change number of days since last pw change)
<code bash>
chage -d 0 rjones
OR
chage --lastday 0 rjones
</code>

\\
Set account expiration
<code bash>
chage -E 2015-08-01 rjones
OR
usermod -e 2015-08-01 rjones
</code>
  * Account will lock on August 1st, 2015.
  * Passing an expire date of "-1" will remove an expiration date.

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