(PECL crack >= 0.1)
crack_check — 用给定的密码来进行破解测试
$dictionary
, string $password
) : bool$password
, string $username = ""
, string $gecos = ""
, resource $dictionary = NULL
) : bool使用特定字典中给定的密码来进行密码强度检测。可供选择的特征(The alternative signature )还考虑用户名和GECOS信息。
此函数是实验性的。此函数的表象，包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担 。
dictionary破解库所使用的字典，如果没有指定，则使用最后一次打开的字典。
password需要检查的密码。
username用于密码检测的这个账户的用户名。
gecos用户账户的 GECOS 信息。
返回 TRUE 如果 password 足够安全, 或者返回 FALSE 表示可能需要进一步的操作.
| 版本 | 说明 |
|---|---|
| 0.3 |
username、gecos 和
dictionary 字段被添加到了可供选择的特征（alternative signature）中。
|
In addition to the usual checks crack can also check for similarities between the password and a username and gecos field (the gecos field normally contains the person's full name on unix systems).
There is a third format for the function call which supplies these additional parameters:
bool crack_check (string $password, string $username, string $gecos, resource $dictionary)
This is true of PECL crack version 0.4, I'm not sure about earlier versions.
If you need to test a password with cracklib but don't have the necessary module available in PHP, you can use a function like this.
It requires the command line cracklib-check binary in /usr/sbin, but changing its location is trivial.
The $message variable will contain cracklib's complaint (if there is one)
You'll want to wrap your invocation of this function in a try...catch block.
<?php
function cracklibCheck($password, &$message)
{
// Clean up password
$password=str_replace("\r", "", $password);
$password=str_replace("\n", "", $password);
// Run password through cracklib-check
exec("echo ".escapeshellarg($password)." | /usr/sbin/cracklib-check 2>/dev/null", $output, $return_var);
// Check it ran properly
if($return_var==0)
{
if(preg_match("/^.*\: ([^:]+)$/", $output[0], $matches))
{
// Check response
if(strtoupper($matches[1])=="OK")
{
// Password is strong
$message="";
return(true);
}
else
{
// Cracklib doesn't like it
$message=$matches[1];
return(false);
}
}
else
{
// Badly formatted response from cracklib-check.
throw new Exception("Didn't understand cracklib-check response.");
}
}
else
{
// Some sort of execution error
throw new Exception("Failed to run cracklib-check.");
}
}
?>