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Use Automatic Client-Side Field Level Encryption with GCP

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  • Overview
  • Before You Get Started
  • Set Up the KMS
  • Register a GCP Service Account
  • Create a GCP Customer Master Key
  • Create the Application
  • Create a Unique Index on your Key Vault collection
  • Create a Data Encryption Key
  • Configure the MongoClient
  • Insert a Document with Encrypted Fields
  • Retrieve Your Document with Encrypted Fields
  • Learn More

Overview

This guide shows you how to build a Client-Side Field Level Encryption (CSFLE)-enabled application using Google Cloud Key Management Service.

After you complete the steps in this guide, you should have:

  • A CMK hosted on Google Cloud Key Management Service.

  • A client application that inserts documents with encrypted fields using your CMK.

Before You Get Started

To complete and run the code in this guide, you need to set up your development environment as shown in the Installation Requirements page.

Throughout this guide, code examples use placeholder text. Before you run the examples, substitute your own values for these placeholders.

For example:

dek_id := "<Your Base64 DEK ID>"

You would replace everything between quotes with your DEK ID.

dek_id := "abc123"

Select the programming language for which you want to see code examples for from the Select your language dropdown menu on the right side of the page.

Tip

See: Full Application

To view the complete runnable application code for this tutorial, go to the following link:

Set Up the KMS

1

Register a GCP Service Account

1

Register or log into your existing account on Google Cloud.

2

Create a service account for your project

To create a service account on Google Cloud, follow the Creating a service account guide in Google's official documentation.

3

Add a service account key

To add a service account key on Google Cloud, follow the Managing service account keys guide in Google's official documentation.

2

Create a GCP Customer Master Key

1

Create a new Customer Master Key

Create a key ring and a symmetric key by following the Create a key guide from Google's official documentation.

This key is your Customer Master Key (CMK).

Record the following details of your CMK for use in a future step of this tutorial.

Field
Required
Description
key_name
Yes
Identifier for the CMK.
key_ring
Yes
Identifier for the group of keys your key belongs to.
key_version
No
The version of the named key.
location
Yes
Region specified for your key.
endpoint
No
The host and optional port of the Google Cloud KMS. The default value is cloudkms.googleapis.com.

Create the Application

Select the tab that corresponds to the MongoDB driver you are using in your application to see relevant code samples.

1

Create a Unique Index on your Key Vault collection

Create a unique index on the keyAltNames field in your encryption.__keyVault namespace.

Select the tab corresponding to your preferred MongoDB driver:

2

Create a Data Encryption Key

1

Add your GCP KMS Credentials

Tip

You saved a file containing your service account key credentials in the Create a GCP Service Account step of this guide.

If you downloaded your credentials in JSON format, you can use the following command to extract the value of your private key, substituting <credentials-filename> with the name of your credentials file. The following command requires that you install OpenSSL:

cat <credentials-filename> | jq -r .private_key | openssl pkcs8 -topk8 -nocrypt -inform PEM -outform DER | base64

If you downloaded your credentials in PKCS12 format, you need to specify your GCP service account import password and to add a PEM pass phrase to access the key when accessing it using the following command, substituting <credentials-filename> with the name of your credentials file:

openssl pkcs12 -info -in <credentials-filename>
2

Add Your Key Information

Update the following code to specify your Customer Master Key:

Tip

You recorded your Customer Master Key details in the in the Create a Customer Master Key step of this guide.

3

Generate your Data Encryption Key

Generate your Data Encryption Key using the variables declared in step one of this tutorial.

Tip

Learn More

To view a diagram showing how your client application creates your Data Encryption Key when using an Google Cloud Key Management Service, see Architecture.

To learn more about the options for creating a Data Encryption Key encrypted with a Customer Master Key hosted in Azure Key Vault, see kmsProviders Object and dataKeyOpts Object.

Tip

See: Complete Code

3

Configure the MongoClient

Tip

Follow the remaining steps in this tutorial in a separate file from the one created in the previous steps.

1

Specify the Key Vault Collection Namespace

Specify encryption.__keyVault as the Key Vault collection namespace.

2

Specify your Cloud Account Credentials

3

Create an Encryption Schema For Your Collection

Tip

Add Your Data Encryption Key Base64 ID

Make sure to update the following code to include your Base64 DEK ID. You received this value in the Generate your Data Encryption Key step of this guide.

4

Specify the Location of the Automatic Encryption Shared Library

Note

Automatic Encryption Options

The automatic encryption options provide configuration information to the Automatic Encryption Shared Library, which modifies the application's behavior when accessing encrypted fields.

To learn more about the Automatic Encryption Shared Library, see the Automatic Encryption Shared Library for CSFLE page.

5

Create the MongoClient

Instantiate a MongoDB client object with the following automatic encryption settings that use the variables declared in the previous steps:

4

Insert a Document with Encrypted Fields

Use your CSFLE-enabled MongoClient instance to insert a document with encrypted fields into the medicalRecords.patients namespace using the following code snippet:

When you insert a document, your CSFLE-enabled client encrypts the fields of your document such that it resembles the following:

{
  "_id": { "$oid": "<_id of your document>" },
  "name": "Jon Doe",
  "ssn": {
    "$binary": "<cipher-text>",
    "$type": "6"
  },
  "bloodType": {
    "$binary": "<cipher-text>",
    "$type": "6"
  },
  "medicalRecords": {
    "$binary": "<cipher-text>",
    "$type": "6"
  },
  "insurance": {
    "provider": "MaestCare",
    "policyNumber": {
      "$binary": "<cipher-text>",
      "$type": "6"
    }
  }
}

Tip

See: Complete Code

5

Retrieve Your Document with Encrypted Fields

Retrieve the document with encrypted fields you inserted in the Insert a Document with Encrypted Fields step of this guide.

To show the functionality of CSFLE, the following code snippet queries for your document with a client configured for automatic CSFLE as well as a client that is not configured for automatic CSFLE.

The output of the preceding code snippet should look like this:

Finding a document with regular (non-encrypted) client.
{
  _id: new ObjectId("629a452e0861b3130887103a"),
  name: 'Jon Doe',
  ssn: new Binary(Buffer.from("0217482732d8014cdd9ffdd6e2966e5e7910c20697e5f4fa95710aafc9153f0a3dc769c8a132a604b468732ff1f4d8349ded3244b59cbfb41444a210f28b21ea1b6c737508d9d30e8baa30c1d8070c4d5e26", "hex"), 6),
  bloodType: new Binary(Buffer.from("0217482732d8014cdd9ffdd6e2966e5e79022e238536dfd8caadb4d7751ac940e0f195addd7e5c67b61022d02faa90283ab69e02303c7e4001d1996128428bf037dea8bbf59fbb20c583cbcff2bf3e2519b4", "hex"), 6),
  'key-id': 'demo-data-key',
  medicalRecords: new Binary(Buffer.from("0217482732d8014cdd9ffdd6e2966e5e790405163a3207cff175455106f57eef14e5610c49a99bcbd14a7db9c5284e45e3ee30c149354015f941440bf54725d6492fb3b8704bc7c411cff6c868e4e13c58233c3d5ed9593eca4e4d027d76d3705b6d1f3b3c9e2ceee195fd944b553eb27eee69e5e67c338f146f8445995664980bf0", "hex"), 6),
  insurance: {
    policyNumber: new Binary(Buffer.from("0217482732d8014cdd9ffdd6e2966e5e79108decd85c05be3fec099e015f9d26d9234605dc959cc1a19b63072f7ffda99db38c7b487de0572a03b2139ac3ee163bcc40c8508f366ce92a5dd36e38b3c742f7", "hex"), 6),
    provider: 'MaestCare'
  }
}
Finding a document with encrypted client, searching on an encrypted field
{
  _id: new ObjectId("629a452e0861b3130887103a"),
  name: 'Jon Doe',
  ssn: 241014209,
  bloodType: 'AB+',
  'key-id': 'demo-data-key',
  medicalRecords: [ { weight: 180, bloodPressure: '120/80' } ],
  insurance: { policyNumber: 123142, provider: 'MaestCare' }
}

Tip

See: Complete Code

Learn More

To learn more about the topics mentioned in this guide, see the following links:

←  Use Automatic Client-Side Field Level Encryption with AzureUse Automatic Client-Side Field Level Encryption with KMIP →

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