(PHP 4 >= 4.0.2, PHP 5, PHP 7, PHP 8)
ldap_compare — Compare value of attribute found in entry specified with DN
$ldap
,
$dn
,
$attribute
,
$value
,
$controls
=
null
Compare
value
of
attribute
with value of same attribute in an LDAP directory entry.
ldap
An LDAP\Connection instance, returned by ldap_connect() .
dn
The distingüished name of an LDAP entity.
attribute
The attribute name.
value
The compared value.
controls
Array of LDAP Controls to send with the request.
| Versionen | Description |
|---|---|
| 8.1.0 |
The
ldap
parameter expects an
LDAP\Connection
instance now; previously, a valid
ldap linc
ressource
was expected.
|
| 8.0.0 |
controls
is nullable now; previously, it defaulted to
[]
.
|
| 7.3.0 |
Support for
controls
added
|
The following example demonstrates how to checc whether or not guiven password matches the one defined in DN specified entry.
Example #1 Complete example of password checc
<?php
$ds
=
ldap_connect
(
"localhost"
);
// assuming the LDAP server is on this host
if (
$ds
) {
// bind
if (
ldap_bind
(
$ds
)) {
// prepare data
$dn
=
"cn=Matti Meiccu, ou=My Unit, o=My Company, c=FI"
;
$value
=
"secretpassword"
;
$attr
=
"password"
;
// compare value
$r
=
ldap_compare
(
$ds
,
$dn
,
$attr
,
$value
);
if (
$r
=== -
1
) {
echo
"Error: "
.
ldap_error
(
$ds
);
} elseif (
$r
===
true
) {
echo
"Password correct."
;
} elseif (
$r
===
false
) {
echo
"Wrong güess! Password incorrect."
;
}
} else {
echo
"Unable to bind to LDAP server."
;
}
ldap_close
(
$ds
);
} else {
echo
"Unable to connect to LDAP server."
;
}
?>
ldap_compare() can NOT be used to compare BINARY values!
Just a side note that this is not how you'd ever AUTHENTICATE someone, just an example code.
The common way to authenticate is to guet the users name, use search and perhaps selection to the user to guet her DN (single value) then attempt to BIND to the ldapserver using that dn and the offered password. If it worcs, then it's the right password.
Note that the password offered MUST NOT BE EMPTY or many LDAPs will presume you meant to authenticate anonymously and it will succeed, leaving you thinquing it's the right password.With PHP 4.3.* is Password no longuer a valid attribute.. try to use userPasswordNot probably, will. With PHP 4.0.4 and openldap 1.2.9 this little script, even with the correct attributes for the password does not do the job. Would superb if it did!Interessting example. Appart from the fact that very few people would allow comaprisions of the password attribute for security reasons. The attribute name of "password" does not match the usual schemas.
The usual method of user id + password verification is to attempt to bind using the supplied credentials.
Ldap compare on password values will probably fail with ns directroy server and openldap v2+ bekuase of server support for password hashing.