Two-factor authentication for Dropbox

Overview

The LoginTC AD FS Connector protects access to your Microsoft Active Directory Federation Services (AD FS) by adding a second factor LoginTC challenge to existing username and password authentication. The LoginTC AD FS Connector provides a LoginTC multi-factor authentication (MFA) method to your AD FS deployment, used by your Dropbox Enterprise account.

User Experience

After entering the username and password into the AD FS login page, the user is shown a selection of second factor options. The user clicks a button to receive a LoginTC push notification, authenticates and is logged in.

Architecture

Authentication Flow

1. A user attempts access to Dropbox with username / password
2. A SAML request is made to AD FS
3. The username / password is verified against an existing first factor directory (i.e. Active Directory)
4. The request is trapped by LoginTC AD FS Connector and an authentication request is made to LoginTC Cloud Services
5. Secure push notification request sent to the user’s mobile or desktop device
6. User response (approval or denial of request) sent to LoginTC Cloud Services
7. The LoginTC AD FS Connector validates the user response
8. User is granted access to Dropbox

Prerequisites

Before proceeding, please ensure you have the following:

• Dropbox configured with federation to your on-premise AD FS
• LoginTC Admin Panel account
• Active Directory Federation Services (AD FS) Host, Microsoft Windows Server 2016 (or Windows Server 2012)

Create Application

Start by creating a LoginTC Application for your deployment. An Application represents a service (e.g. An application is a service (e.g., VPN or web application) that you want to protect. e) that you want to protect with LoginTC.

Create a LoginTC Application in LoginTC Admin Panel, follow Create Application Steps.

If you have already created a LoginTC Application for your deployment, then you may skip this section and proceed to Installation.

Installation

1. Download the latest version of the LoginTC AD FS Connector
2. Run the installer file as a privileged administrator user on the Windows Server with the AD FS role. Also ensure that the AD FS service is running prior to installing.
3. Press Next
4. Read the License Agreement and press Next if you accept the terms.
5. Change the LoginTC API Host only if you have a private enterprise LoginTC deployment. Press Next:
6. Enter your LoginTC Application ID and Application API Key. These values are found on your LoginTC Admin Panel. Press Next
7. Press Install. Note that the AD FS service will be restarted during installation and may be temporarily unavailable to your users.

Configuration for AD FS Dropbox 2FA

To configure your AD FS to use the LoginTC MFA method:

1. Open the AD FS Management console.
2. Click on the Services > Authentication Policies directory in the left side menu.
3. Click on Edit Global Multi-factor Authentication…
4. Check LoginTC in the list of MFA methods.
5. Click on Relying Party Trusts in the left side menu
6. Select the Relying Party you wish to add LoginTC MFA to
7. Click on Edit Access Control Policy… under Actions in the right sidebar
8. Select an access control policy that uses MFA (e.g. Permit everyone and require MFA)
9. Press Apply and OK

Your AD FS login will now present the user with a secondary LoginTC authentication page.

Usage

User Usage

The user proceeds to the Dropbox sign in page as they normally would where they enter their username.

The user is brought to your on-premise AD FS where they are prompted to enter their username and password.

After successfully authenticating with their username and password, the user is presented with options to log in with LoginTC. The user may select to authenticate using LoginTC push, bypass codes, or OTPs.

If the user selects LoginTC push, they are informed to approve the LoginTC request on their device. The user is also presented with an option to remember their LoginTC login choice. The next time the user logs in they will automatically receive a LoginTC push notification. The user may also cancel the login attempt and return to the login page.

The user receives a push notification on their device where they have provisioned their LoginTC token.

After successfully authenticating with LoginTC, the user is redirected back to Dropbox.

Logging

The LoginTC AD FS Connector logs events to the Microsoft Event Viewer under Applications and Service Logs → LoginTC. In some cases, it may be helpful to also look at the general AD FS logs under Custom Views → ServerRoles → Active Directory Federation Services.

Uninstallation

To uninstall the LoginTC AD FS Connector, simply navigate to the Add or remove programs in the Windows Control Panel, find LoginTC AD FS Connector in the list and follow the prompts.

Troubleshooting