Last updated: Sat, 17 Jul 2004

XI. Crack Functions

Introduction

These functions allow you to use the CrackLib library to test the 'strength' of a password. The 'strength' of a password is tested by that checks length, use of upper and lower case and checked against the specified CrackLib dictionary. CrackLib will also give helpful diagnostic messages that will help 'strengthen' the password.

Not: This extension has been removed as of PHP 5 and moved to the PECL repository.

Requirements

More information regarding CrackLib along with the library can be found at http://www.crypticide.org/users/alecm/.

Installation

In order to use these functions, you must compile PHP with Crack support by using the --with-crack[=DIR] option.

Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

Tablo 1. Crack configuration options

Name	Default	Changeable
crack.default_dictionary	NULL	PHP_INI_SYSTEM

For further details and definition of the PHP_INI_* constants see ini_set().

Resource Types

This extension has no resource types defined.

Predefined Constants

This extension has no constants defined.

Examples

This example shows how to open a CrackLib dictionary, test a given password, retrieve any diagnostic messages, and close the dictionary.

�rnek 1. CrackLib example


<?php

// Open CrackLib Dictionary

$dictionary = crack_opendict('/usr/local/lib/pw_dict')

     or die('Unable to open CrackLib dictionary');



// Perform password check

$check = crack_check($dictionary, 'gx9A2s0x');



// Retrieve messages

$diag = crack_getlastmessage();

echo $diag; // 'strong password'



// Close dictionary

crack_closedict($dictionary);

?>

Not: If crack_check() returns TRUE, crack_getlastmessage() will return 'strong password'.

��indekiler
crack_check -- Performs an obscure check with the given password
crack_closedict -- Closes an open CrackLib dictionary
crack_getlastmessage -- Returns the message from the last obscure check
crack_opendict -- Opens a new CrackLib dictionary

add a note User Contributed Notes
Crack Functions

leeyuiwah at NOSPAM dot hknet dot com
22-Nov-2007 02:24


Please note that the manual is a little bit misleading when providing references.  The sourceforge URL cited 

(i.e. http://sourceforge.net/projects/cracklib) is the homepage of cracklib the enabler (upon which other things build), NOT the crack PECL extension.  If you are a PHP user looking for the crack PECL extension, you should NOT download from sourceforge.  Instead, you should download from the PECL homepage (http://pecl.php.net).  When you are there, search for "crack" not "cracklib".

Martin
05-Jun-2007 09:08


For those of you not familiar with the CrackLib Library: 



CrackLib (or PHP Crack) can not cope with plaintext wordlists.

You have to generate a binary version of any plaintext list first.



After you have done this you get 3 files with different extensions:



my_list.txt



---->



my_list.pwd

my_list.hwm

my_list.pwi



crack_opendict() must be called with the first argument describing the path and base filename of the binary wordlist, e.g. C:\....\my_list or /usr/local/... (see below)



Now the bad news - how to generate the 3 files: 



The only way i managed to do it: 



o Download the CrackLib package from sourceforge (see link in php.net txt)

o USE UNIX/LINUX:

o run configure

o run make all

o run make install

o run make dict (having the wordlists in the /dict directory)

o look for the files in /usr/local/share/cracklib/

o copy the files in a convenient directory



That's it.

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crack_check

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Last updated: Sat, 17 Jul 2004