Lab 9.2 Locking Accounts after Excessive Login Attempts
I think current contents of Lab 9.2 seems not to work in CentOS8 environment, and I think the contents should be updated.
At least,
- pam_tally2 is absolete, instead **pam_faillock **is recommended
- You shouldn't modify manually password-auth/system-auth files ( it's prohibited to do so in the files)
- You should use **authselect **command instead ( **authconfig **is an older command)
in short, It's better to excercise this Lab
- Use pam_faillock **, not **pam_tally2
- Use authselect and modify configuration _indirectly _
[What I did ]
- create authselect user profile from current sssd profile
[root@main ~]# authselect create-profile test-lab -b sssd (profile name is test-lab)
- change the profile to above with faillock feature
[root@main ~]# authselect select custom/test-lab with-faillock without-nullok [root@main ~]# authselect current Profile ID: custom/test-lab Enabled features: - with-faillock - without-nullok
- change password-auth/system-auth indirectly
[root@main ~]#vim /etc/authselect/custom/test-lab/password-auth [root@main ~]#vim /etc/authselect/custom/test-lab/system-auth
i set deny counts to twice (deny=2), unlock_time to 0 (infinite) (see [Reference sites][1])
- apply above chaanges
[root@main ~]#authselect apply-changes
- Try
( I already set password to failuser previously.)
[root@main ~]# ssh failuser@localhost failuser@localhost's password: Permission denied, please try again. failuser@localhost's password: Permission denied, please try again. failuser@localhost's password: failuser@localhost: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
**Note : password prompt appears 3 times. this is sshd behavior not faillock's. if you change prompt number, you add option like;
ssh failuser@localhost -o 'NumberOfPasswordPrompts 5'
- Check by faillock
[root@main ~]# faillock failuser: When Type Source Valid 2021-06-27 17:43:12 RHOST ::1 V 2021-06-27 17:43:15 RHOST ::1 V gdm: When Type Source Valid root: When Type Source Valid student: When Type Source Valid
the user "failuser" failes twice. this means the user locked. (BTW I don't know how to see the user is locked or not)
- Unlock the user
[root@main ~]# faillock --user failuser --reset
[Reference sites]
[1] https://i66lab.com/User:xltran/App/CentOS/8/Administration/Authselect
[2] https://michaelpesa.com/posts/creating-custom-authselect-profiles/
[3] https://www.golinuxcloud.com/pam-faillock-lock-user-account-linux/
Comments
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Thank you for the input.
Lee
0
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