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Block file uploads to Google Drive

You can use Cloudflare Gateway and the Cloudflare WARP client application to prevent enrolled devices from uploading files to an unapproved cloud storage provider.

🗺️ This tutorial covers how to:

  • Create a Gateway policy to block file uploads to a specific provider
  • Enroll devices into a Cloudflare for Teams account where this rule will be enforced
  • Log file type upload attempts

⏲️ Time to complete:

10 minutes

Create a Gateway HTTP policy

You can build a policy that will block file uploads to Google Drive. Navigate to the Policies page. On the HTTP tab, click Create a policy.

Add Policy

Name the policy and provide an optional description.

Add Policy

Cloudflare curates a constantly-updating list of the hostnames, URLs, and endpoints used by common applications. In this example, "Google Drive" list containst the destinations used by Google Drive.

In the rule builder, select "Application" in the Selector field, "in" in the Operator field, and under "File Sharing" select "Google Drive" in the Value field.

Select Drive

Next, click + Add Condition and choose "Upload Mime Type" and "matches regex". Under value, input .* - this will match against files of any type being uploaded.

Block Drive

Scroll to Action and choose "Block". Click Create rule to save the rule.

Block Drive

Exempt some users

You can allow certain users to upload to Google Drive, while blocking all others, by adding a second policy and modifying the order of rule operations in Gateway.

Create a new policy and include the first two values from the previous policy. Add a third condition and input the value of user identity that should be allowed to upload. This example uses the name of a group from an integrated identity provider.

Allow Drive

Select Allow for the action and save the rule.

Allow Drive

Next, modify the existing rule order.

Rule List

Drag the Allow rule higher than the Block rule.

Rule List

Integrate your identity provider

The HTTP filtering policy created will apply to any HTTP requests sent from configured locations or enrolled devices. You can begin to enroll devices by determining which users are allowed to enroll.

Navigate to the Settings section of the Cloudflare for Teams Dashboard and select Authentication. Cloudflare for Teams will automatically create a "One-time PIN" option which will rely on your user's emails. You can begin using the one-time PIN option immediately or you can also integrate your corporate identity provider.

Determine which devices can enroll

Next, build a rule to decide which devices can enroll in your account.

  1. Navigate to Settings > Devices > Device enrollment.

    Device settings

  2. Click Manage.

  3. Click Add a rule.

    Device Enrollment

    Determine who is allowed to enroll by using criteria including Access groups, groups from your identity provider, email domain, or named users. This example allows any user with a @cloudflare.com account to enroll.

    Allow Cloudflare users

  4. Click Save.

Your rule will now be visible under the Device enrollment rules list.

Configure the Cloudflare certificate

To inspect traffic, Cloudflare Gateway requires that a certificate be installed on enrolled devices. You can also distribute this certificate through an MDM provider. The example below describes the manual distribution flow.

To download the Cloudflare certificate:

  • Follow the link provided in these instructions.
  • Find the certificate in the Teams Dashboard, by navigating to Settings > Devices > Certificates.

Enable the Cloudflare proxy

Once the certificate has been installed, you can configure Gateway to inspect HTTP traffic. To do so, navigate to Settings > Network. Toggle Proxy to Enabled. This will tell Cloudflare to begin proxying any traffic from enrolled devices, except the traffic excluded using the split tunnel settings.

Next, enable TLS decryption. This will tell Cloudflare to begin decrypting traffic for inspection from enrolled devices, except the traffic excluded from inspection.

Policy settings

Enroll a device

  1. Follow the instructions to install the WARP client depending on your device type. Cloudflare Gateway does not need a special version of the client.

  2. Once the client is installed, click the gear icon.

    WARP

  3. Under the Account tab, click Login with Cloudflare for Teams.

    Account View

  4. Input your team name. You can find it on the Teams Dashboard under Settings > General.

    Team Name

The user will be prompted to login with the identity provider configured in Cloudflare Access. Once authenticated, the client will update to Teams mode. You can click the gear to toggle between DNS filtering or full proxy. In this use case, you must toggle to Gateway with WARP. These settings can be configured globally for an organization through a device management platform.

Confirm WARP

Test policy

You can test the policy by attempting to upload a file to Google Drive. Google Drive should return an error message when blocked.

Block Action