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Top Forums UNIX for Advanced & Expert Users Need A Script To List All Failed Log In Users Post 302495446 by malcolmpdx on Thursday 10th of February 2011 09:57:57 AM
Old 02-10-2011
You might look at the faillog command, if your systems are linux. However, as near as I can tell, this doesn't catch things like ssh keybased auth.

In all likelihood, the most comprehensive way is to parse syslog files. That's not terribly hard, at least if you have your logging centralized to one server.
 

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FAILLOG(8)						      System Manager's Manual							FAILLOG(8)

NAME
faillog - examine faillog and set login failure limits SYNOPSIS
faillog [-u login-name] [-a] [-t days] [-m max] [-pr] DESCRIPTION
faillog formats the contents of the failure log, /var/log/faillog, and maintains failure counts and limits. The order of the arguments to faillog is significant. Each argument is processed immediately in the order given. The -p flag causes failure entries to be printed in UID order. Entering -u login-name flag will cause the failure record for login-name only to be printed. Entering -t days will cause only the failures more recent than days to be printed. The -t flag overrides the use of -u. The -a flag causes all users to be selected. When used with the -p flag, this option selects all users who have ever had a login failure. It is meaningless with the -r flag. The -r flag is used to reset the count of login failures. Write access to /var/log/faillog is required for this option. Entering -u login-name will cause only the failure count for login-name to be reset. The -m flag is used to set the maximum number of login failures before the account is disabled. Write access to /var/log/faillog is required for this option. Entering -m max will cause all accounts to be disabled after max failed logins occur. This may be modified with -u login-name to limit this function to login-name only. Selecting a max value of 0 has the effect of not placing a limit on the number of failed logins. The maximum failure count should always be 0 for root to prevent a denial of services attack against the system. Options may be combined in virtually any fashion. Each -p, -r, and -m option will cause immediate execution using any -u or -t modifier. CAVEATS
faillog only prints out users with no successful login since the last failure. To print out a user who has had a successful login since their last failure, you must explicitly request the user with the -u flag, or print out all users with the -a flag. Some systems may replace /var/log with /var/adm or /usr/adm. FILES
/var/log/faillog - failure logging file SEE ALSO
login(1), faillog(5) AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com) FAILLOG(8)
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