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How to Monitor Failed Login Attempts


In Linux you can use faillog command to display failed login attempts or you can set login failure limits. faillog formats the contents of the failure log from /var/log/faillog database / secure log file. It also can be used for maintains failure counters and limits.
For RHEL/CentOS Linux 5.x, you need to modify /etc/pam.d/system-auth file to monitor or track failed login attempts. You need to configure PAM module pam_tally.so. Otherwise faillog command will never display failed login attempts.
STEP 1: Open /etc/pam.d/system-auth file:
# vim /etc/pam.d/system-auth
Append following two pam_tally.so modules:

auth required pam_tally.so no_magic_root
account required pam_tally.so deny=5 no_magic_root lock_time=120

Where,
deny=5 : Deny access if tally for this user exceeds 5 times.
lock_time=120 : Always deny for 120 seconds after failed attempt.
magic_root : If the module is invoked by a user with uid=0 the counter is not incremented. The sys-admin should use this for user launched services, like su, otherwise this argument should be omitted.
no_magic_root : Avoid root account locking, if the module is invoked by a user with uid=0
Save and close the file.
STEP 2: Now, to display failed login attempts for dhaval,

# faillog -u dhaval

Login Failures Maximum Latest On
dhaval 2 0 10/07/10 14:12:53 -0600 122.11.xx.yy
STEP 3: To display failed login attempts for all users, use the -a option:

# faillog -a

Login Failures Maximum Latest On
root 0 0 10/07/10 14:49:52 +0530 tty1
dhaval 0 0 10/07/10 22:05:03 +0530 tty1
If you want to reset the counter use  -r option. If you want to reset particular users failed attempts, use -u USERNAME option:

# faillog -r

# faillog -r -u dhaval

 


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How to Monitor Failed Login Attempts

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