swordfish --- a password generator Post: 302507014

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Special Forums Cybersecurity swordfish --- a password generator Post 302507014 by Perderabo on Tuesday 22nd of March 2011 02:18:42 PM

03-22-2011

Administrator Emeritus

Quote:

Originally Posted by ArcAngel

Hi,

I use your tool on Solaris 10, only i get this error.

[machine:user]$ ./swordfish
>>}###@>---- format +s +x 10
./swordfish[39]: !X0 && !X1 && !X2 && !X3 && !X4 && !Carry : bad number
password statistics are on
password expansions are on
10 passwords will be generated per template

Opps! Sorry ArcAngel, I had not noticed your report before. Better late than never I guess. Smilie

There is no X4, it only goes up to X3. The fix was to remove "!X4 && " from that line. Actually, it's odd that the script ran everywhere else.

I have recently been ordered to use 12 character randomly generated passwords that meet strong complexity requirements. That is why I have dusted off this old script. I need it badly right now. Ironically, I want to to run on Solaris just like ArcAngel. I also tested it on RedHat and it broke on the latest ksh. I had to change my character slicing technique to get it work. I used to do stuff like this:

Code:

first=${x%${x#?}}

to get the first character. That breaks depening on the contents of the field. That had always been the case but it breaks more easily with today's ksh. I switched to

Code:

        first=$x
        while ((${#first} > 1 )) ; do
               first=${first%?}
        done

which works all the time and it much faster than it looks. I upgraded the help system a little, corrected spelling errors, etc. I had to reverse engineer my own code so I upgraded the comments quite a bit as well. It saved me from needed to memorize a string of garbage from a lesser password generator. I hope others can use it as well.

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pam_pwhistory

PAM_PWHISTORY(8)						 Linux-PAM Manual						  PAM_PWHISTORY(8)

NAME

       pam_pwhistory - PAM module to remember last passwords

SYNOPSIS

       pam_pwhistory.so [debug] [use_authtok] [enforce_for_root] [remember=N] [retry=N] [authtok_type=STRING]

DESCRIPTION

       This module saves the last passwords for each user in order to force password change history and keep the user from alternating between the
       same password too frequently.

       This module does not work together with kerberos. In general, it does not make much sense to use this module in conjunction with NIS or
       LDAP, since the old passwords are stored on the local machine and are not available on another machine for password history checking.

OPTIONS

       debug
	   Turns on debugging via syslog(3).

       use_authtok
	   When password changing enforce the module to use the new password provided by a previously stacked password module (this is used in the
	   example of the stacking of the pam_cracklib module documented below).

       enforce_for_root
	   If this option is set, the check is enforced for root, too.

       remember=N
	   The last N passwords for each user are saved in /etc/security/opasswd. The default is 10. Value of 0 makes the module to keep the
	   existing contents of the opasswd file unchanged.

       retry=N
	   Prompt user at most N times before returning with error. The default is 1.

       authtok_type=STRING
	   See pam_get_authtok(3) for more details.

MODULE TYPES PROVIDED

       Only the password module type is provided.

RETURN VALUES

       PAM_AUTHTOK_ERR
	   No new password was entered, the user aborted password change or new password couldn't be set.

       PAM_IGNORE
	   Password history was disabled.

       PAM_MAXTRIES
	   Password was rejected too often.

       PAM_USER_UNKNOWN
	   User is not known to system.

EXAMPLES

       An example password section would be:

	   #%PAM-1.0
	   password	required       pam_pwhistory.so
	   password	required       pam_unix.so	  use_authtok

       In combination with pam_cracklib:

	   #%PAM-1.0
	   password	required       pam_cracklib.so	  retry=3
	   password	required       pam_pwhistory.so   use_authtok
	   password	required       pam_unix.so	  use_authtok

FILES

       /etc/security/opasswd
	   File with password history

SEE ALSO

       pam.conf(5), pam.d(5), pam(8)pam_get_authtok(3)

AUTHOR

       pam_pwhistory was written by Thorsten Kukuk <kukuk@thkukuk.de>

Linux-PAM Manual						    09/19/2013							  PAM_PWHISTORY(8)