Password policy


You can use these schemes to hash the password before sending it to LDAP directory:

  • SHA

  • SSHA

  • MD5

  • SMD5


  • ARGON2

  • clear

  • auto

Set one of them in $hash:

$hash = "clear";


This option is ignored with Active Directory mode.


Use auto to get the current password value and find the hash. This requires a read access to the password.

You can configure the crypt salt prefix to choose the algorithm (see crypt documentation):

$hash_options['crypt_salt_prefix'] = "$6$";


Set minimal and maximal length in $pwd_min_length and $pwd_max_length:

$pwd_min_length = 4;
$pwd_max_length = 8;


Set 0 in $pwd_max_length to disable maximal length checking.


You can set the minimal number of lower, upper, digit and special characters:

$pwd_min_lower = 3;
$pwd_min_upper = 1;
$pwd_min_digit = 1;
$pwd_min_special = 1;

Special characters are defined with a regular expression, by default:

$pwd_special_chars = "^a-zA-Z0-9";

This means special characters are all characters except alphabetical letters and digits.

You can check that these special characters are not at beginning or end of the password:

$pwd_no_special_at_ends = true;

You can also disallow characters from being in password, with $pwd_forbidden_chars:

$pwd_forbidden_chars = "@%";

This means that @ and % could not be present in a password.

You can define how many different class of characters (lower, upper, digit, special) are needed in the password:

$pwd_complexity = 2;

Pwned Passwords

Allows to check if the password was already compromised, using database:

$use_pwnedpasswords = true;


You can prevent a user from using his old password as a new password if this check is not done by the directory:

$pwd_no_reuse = true;

You may also want to check for partial password reuses, ensuring the new password includes at least N distinct new characters:

$pwd_diff_last_min_chars = 3;

Forbidden words

Give a list of forbidden words that the password should not contain:

$pwd_forbidden_words = array("azerty", "qwerty", "password");

Forbidden LDAP fields

Give a list of LDAP fields which values should not be present in the password:

$pwd_forbidden_ldap_fields = array('cn', 'givenName', 'sn', 'mail');

Show policy

Password policy can be displayed to user by configuring $pwd_show_policy. Three values are accepted:

  • always: policy is always displayed

  • never: policy is never displayed

  • onerror: policy is only displayed if password is rejected because of it, and the user provided his old password correctly.

$pwd_show_policy = "never";

You can also configure if the policy will be displayed above or below the form:

$pwd_show_policy_pos = "above";

Extended error

You can display the error message returned by the directory when password is refused. The message content depends on your LDAP server software:

$show_extended_error = true;