Check password strength Post: 302424743

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Top Forums UNIX for Dummies Questions & Answers Check password strength Post 302424743 by petel1 on Wednesday 26th of May 2010 02:51:48 PM

05-26-2010

Registered User

Check password strength

For moderator: I made a new thread in a proper part of the forum now https://www.unix.com/homework-coursework-questions/137119-user-processes.html

But now i wan't to make something which isn't related to a homework, so i hope
you won't close this one. Thanks to those two answers, you helped me!

I would like to write a prog which can test the strength of password
It should check the length of password, it should be longer than 8 characters,
it must contain 2 numbers [0-9]
and some special signs like @,%,$
and of course typical alphabet from [A-z]

with which function can i limit the minimum pass length Smilie

---------- Post updated at 03:11 PM ---------- Previous update was at 11:04 AM ----------

hmm guess i have to work it out myself

---------- Post updated at 05:51 PM ---------- Previous update was at 03:11 PM ----------

Ok i have done everything by now, the only thing thats bugging me is how can i check how many
numbers a string contains, it should have at least two.

if [ $pass =~ [0-9]+ ]; then

but this gives me just one or more

I need an advice, please

petel1

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lchage

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

NAME

       lchage - Display or change user password policy

SYNOPSIS

       lchage [OPTION]... user

DESCRIPTION

       Displays or allows changing password policy of user.

OPTIONS

       -d, --date=days
	      Set the date of last password change to days after Jan 1 1970.

       -E, --expire=days
	      Set the account expiration date to days after Jan 1 1970.  Set days to -1 to disable account expiration.

       -i, --interactive
	      Ask all questions when connecting to the user database, even if default answers are set up in libuser configuration.

       -I, --inactive=days
	      Disable the account after days after password expires (after the user user is required to change the password).

       -l, --list
	      Only list current user's policy and make no changes.

       -m, --mindays=days
	      Require at least days days between password changes.  Set days to 0 to disable this checking.

       -M, --maxdays=days
	      Require changing the password after days since last password change.  Set days to 99999 to disable this checking.

       -W, --warndays=days
	      Start warning the user days before password expires (before the user is required to change the password).

EXIT STATUS

       The exit status is 0 on success, nonzero on error.

libuser 							    Jan 12 2005 							 lchage(8)