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19.6. Setting Account Lockout Policies

A brute force attack occurs when a malefactor attempts to guess a password by simply slamming the server with multiple login attempts. An account lockout policy prevents brute force attacks by blocking an account from logging into the system after a certain number of login failures — even if the correct password is subsequently entered.

Note

A user account can be manually unlocked by an administrator using the ipa user-unlock. Refer to Section 9.6, “Unlocking User Accounts After Password Failures”.

19.6.1. In the UI
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These attributes are available in the password policy form when a group-level password policy is created or when any password policy (including the global password policy) is edited.
  1. Click the Policy tab, and then click the Password Policies subtab.
  2. Click the name of the policy to edit.
    View larger image
  3. Set the account lockout attribute values.
    View larger image
    There are three parts to the account lockout policy:
    • The number of failed login attempts before the account is locked (Max Failures).
    • The time after a failed login attempt before the counter resets (Failure reset interval). Since mistakes do happen honestly, the count of failed attempts is not kept forever; it naturally lapses after a certain amount of time. This is in seconds.
    • How long an account is locked after the max number of failures is reached (Lockout duration). This is in seconds.

19.6.2. In the CLI
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There are three parts to the account lockout policy:
  • The number of failed login attempts before the account is locked (--maxfail).
  • How long an account is locked after the max number of failures is reached (--lockouttime). This is in seconds.
  • The time after a failed login attempt before the counter resets (--failinterval). Since mistakes do happen honestly, the count of failed attempts is not kept forever; it naturally lapses after a certain amount of time. This is in seconds.
These account lockout attributes can all be set when a password policy is created with pwpolicy-add or added later using pwpolicy-mod. For example: 
[jsmith@ipaserver ~]$ kinit admin
[jsmith@ipaserver ~]$ ipa pwpolicy-mod examplegroup --maxfail=4 --lockouttime=600 --failinterval=30
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