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  • ldap_compare()

    (PHP 4 >= 4.0.2, PHP 5, PHP 7)

    Compare value of attribute found in entry specified with DN

    说明

    ldap_compare(resource $link_identifier,string $dn,string $attribute,string $value[,array $serverctrls= array()]): mixed

    Compare$valueof$attributewith value of same attribute in an LDAP directory entry.

    参数

    $link_identifier

    An LDAP link identifier, returned by ldap_connect().

    $dn

    The distinguished name of an LDAP entity.

    $attribute

    The attribute name.

    $value

    The compared value.

    $serverctrls

    Array of LDAP Controls to send with the request.

    返回值

    Returns TRUE if$valuematches otherwise returns FALSE. Returns -1 on error.

    更新日志

    版本说明
    7.3 Support for$serverctrlsadded

    范例

    The following example demonstrates how to check whether or not given password matches the one defined in DN specified entry.

    Example #1 Complete example of password check

    <?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 Meikku, 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 ($r === false) {
                echo "Wrong guess! Password incorrect.";
            }
        } else {
            echo "Unable to bind to LDAP server.";
        }
        ldap_close($ds);
    } else {
        echo "Unable to connect to LDAP server.";
    }
    ?>
    

    注释

    Warning

    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 get the users name, use search and perhaps selection to the user to get her DN (single value) then attempt to BIND to the ldapserver using that dn and the offered password. If it works, 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 thinking it's the right password.
    With PHP 4.3.* is Password no longer a valid attribute.. try to use userPassword
    Not 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!
    Interesting example. Apart 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+ becuase of server support for password hashing.

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