README

This bundle implements an LDAP-based UserProvider for Symfony2's Security component.

When used in conjunction with Symfony2's HTTP basic authentication listener, this bundle can verify usernames against an LDAP server and populate roles based on groups to which the LDAP user belongs.

Installation

Dependencies

This bundle depends on the Zend Framework 2 LDAP client.

If you don't already have the ZF2 codebase available in the vendor path of your Symfony2 application, you may be interested in using git-subtree to pull in the LDAP client by itself. Instructions for this process are documented in this thread from the symfony-devs mailing list.

Submodule Creation

Add LdapBundle to your src/ directory:

$ git submodule add https://github.com/opensky/LdapBundle.git vendor/bundles/OpenSky/Bundle/LdapBundle

Class Autoloading

If the src/ directory is already configured in your project's autoload.php via registerNamespaceFallback(), no changes should be necessary. Otherwise, either define the fallback directory or explicitly add the "OpenSky" namespace:

# app/autoload.php

$loader->registerNamespaces(array(
    'OpenSky' => __DIR__.'/../vendor/bundles',
));

Additionally, ensure that the "Zend" namespace is also configured for autoloading.

Application Kernel

Add LdapBundle to the registerBundles() method of your application kernel:

public function registerBundles()
{
    return array(
        new OpenSky\Bundle\LdapBundle\OpenSkyLdapBundle(),
    );
}

Configuration

LdapBundle Extension

The LDAP UserProvider may be configured with the following:

# app/config/config.yml

opensky_ldap:
    client:
        host: ldap.example.com
    user_base_dn:        ou=Users,dc=example,dc=com
    user_filter:         (objectClass=employee)
    username_attribute:  uid
    role_base_dn:        ou=Groups,dc=example,dc=com
    role_filter:         (objectClass=role)
    role_name_attribute: cn
    role_user_attribute: memberuid
    security:
        role_prefix:   ROLE_LDAP_
        default_roles: [ROLE_ADMIN, ROLE_LDAP]

These settings are explained below:

client: array of options for the ZF2 LDAP client. Any options may be specified, although host is likely a minimum requirement.
user_base_dn: base DN when searching for users is LDAP.
user_filter: filter to apply when searching for users in LDAP.
username_attribute: user entry attribute to use as a username.
role_base_dn: base DN when searching for roles in LDAP.
role_filter: filter to apply when searching for roles in LDAP.
role_name_attribute: role entry attribute to use as the role name.
role_user_attribute: role entry attribute to use for inferring user relationships. Its value should be a set of user identifiers, which correspond to usernameAttribute values of user entries.
security.role_prefix: prefix to apply when transforming role names from LDAP entries into security roles. See: Deriving Symfony2 Roles from LDAP Groups
security.default_roles: array of default roles to be assigned to all LDAP users, before roles are inferred from user/role entry relationships.

Security Component

This bundle is currently intended to be used alongside Apache's mod_auth_ldap. As such, it must be configured to operate with a PreAuthenticatedAuthenticationProvider. A pre-auth provider for HTTP basic authentication is included, and may be configured as follows:

# app/config/security.yml

security.config:
    providers:
        ldap:
            id: opensky_ldap.user_provider
    firewalls:
        backend:
            provider:            ldap
            pattern:             /admin(/.*)?
            http_basic_pre_auth: true
            stateless:           true
    factories:
        - %kernel.root_dir%/../vendor/bundles/OpenSky/Bundle/LdapBundle/Resources/config/security_factories.xml

Note: a future enhancement for this bundle will be a UserAuthenticationProvider to allow for authentication against an LDAP server, which will remove the need to use mod_auth_ldap for pre-authentication.

The LdapUser Object

Users provided by the LDAP UserProvider will be instances of LdapUser, which is a lightweight implementation of Symfony2's UserInterface. This user object stores only a username and array of roles.

Deriving Symfony2 Roles from LDAP Groups

LdapBundle will attempt to create Symfony2 security roles based on an attribute from the group entry. By default, the group's common name ("cn") will be used.

In general, a group's name will be slugified (using an underscore), uppercased and prefixed with a configurable string ("ROLE_LDAP_" by default). For example, if your user exists within the LDAP group named "Admin", the provided LdapUser object will have the "ROLE_LDAP_ADMIN" role. The full implementation can be found within the LdapUserProvider class.

opensky / ldap-bundle

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