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Top Forums UNIX for Dummies Questions & Answers Maximum unsuccessful attempts in unix Post 302579792 by methyl on Tuesday 6th of December 2011 03:14:09 PM
Old 12-06-2011
Until we know what Operating System you have, this is guesswork. There are proprietary security mechanisms and various connection mechanisms to connect to a unix server. There is no generic answer for all "unix".

For a basic "telnet" connection (where allowed by local rules) a general answer is to read "man login" (It's specific to the machine).
The "telnet" login process is designed to be immune to brute force attack and will not accept typeahead or multiple failed passwords before getting slower and slower to respond and then dropping the connection. You will know that the unix "last" command gives a history of successful logins, but when properly configured the unix "lastb" command gives a history of unsuccessful logins (including the source IP address).

Personally I have never heard the term "blocked users" in the context of unix or Windows Systems Administration (though I can guess what it means).
I do routinely "lock" unix accounts (see "man passwd") and "disable" Microsoft Windows accounts.


Hmm. Sounds like interview questions ... or maybe awkward questions from an auditor?

Last edited by methyl; 12-06-2011 at 04:27 PM.. Reason: refining and typos and unsuccessful spelling
 

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getprpw(1M)															       getprpw(1M)

NAME
getprpw - display protected password database SYNOPSIS
parm[,parm]] username DESCRIPTION
displays the user's protected password database settings. This command is available only to the superuser in a trusted system. Normally it is only used via SAM, see sam(1M). uses the configuration file default if is not specified. See nsswitch.conf(4). Options recognizes the following options. Specifies to get information from the local user. Displays the arguments supplied to in raw format Displays the database value for the argument passed. An "invalid-opt" is printed if a list of options passed to contains an invalid option. The rest of the options will be processed. If is specified without all parameters are displayed in the order given below. Boolean values are returned as or (for system default values in Numeric values are specified as positive numbers, 0, or -1. A value of -1 indicates that the field has not been assigned a value in the database. Units of time are returned in number of days (>=0), although the database keeps them in seconds. This and other minor differences between the command parameters and the database fields are consistent with modprpw(1M). The following parameters for the user can be displayed using the option. They are listed below in the order shown in The database fields are fully explained in prpwd(4). user uid boot authorization flag audit id audit flag minimum time between password changes maximum password length password expiration time password lifetime last successful password change time last unsuccessful password change time account expiration time last login time interval password expiration warning time whether user picks password, whether system generates pronounceable passwords, whether password is restricted, i.e, checked for triviality, NULL passwords are allowed, Not recommended! whether system generates passwords having characters only, whether system generates passwords having letters only, time of day allowed for login time of last successful login time of last unsuccessful login tty of last successful login consecutive number of unsuccessful logins so far tty of last unsuccessful login maximum unsuccessful login tries administrator lock, if on, if off, if not set. returns the reason for a lockout in a "bit" valued string, where 0 = condition not present, 1 is present. The position, left to right represents: 1 past password lifetime 2 past last login time (inactive account) 3 past absolute account lifetime 4 exceeded unsuccessful login attempts 5 password required and a null password 6 admin lock 7 password is a * RETURN VALUE
0 success 1 user not privileged 2 incorrect usage 3 cannot find the password file 4 system is not trusted EXAMPLES
Displays the database aging fields for user "someusr". The command displays: WARNINGS
This command is intended for SAM use only. It may change with each release and can not be guaranteed to be backward compatible. Several database fields interact with others. The side effects of an individual change may not cause a problem till much later. Special meanings may apply in the following cases: o an absent field o a field without a value o a field with a zero value HP-UX 11i Version 3 is the last release to support trusted systems functionality. AUTHOR
was developed by HP. FILES
System Password file Protected Password Database System Defaults Database SEE ALSO
modprpw(1M), prpwd(4), nsswitch.conf(4). TO BE OBSOLETED getprpw(1M)
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