https://github.com/approov/quickstart-ruby-token-check

Quickstart Approov integration example for Ruby without depending on a framework.
https://github.com/approov/quickstart-ruby-token-check

api api-security approov approov-backend approov-backend-quicksart approov-integration approov-quickstart security

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Quickstart Approov integration example for Ruby without depending on a framework.

• Host: GitHub
• URL: https://github.com/approov/quickstart-ruby-token-check
• Owner: approov
• Created: 2020-09-15T10:18:57.000Z (about 4 years ago)
• Default Branch: main
• Last Pushed: 2022-12-20T18:56:06.000Z (almost 2 years ago)
• Last Synced: 2024-04-14T17:01:26.488Z (7 months ago)
• Topics: api, api-security, approov, approov-backend, approov-backend-quicksart, approov-integration, approov-quickstart, security
• Language: Ruby
• Homepage: https://approov.io
• Size: 50.8 KB
• Stars: 2
• Watchers: 7
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Approov QuickStart - Ruby Token Check

[Approov](https://approov.io) is an API security solution used to verify that requests received by your backend services originate from trusted versions of your mobile apps.

This repo implements the Approov server-side request verification code in Ruby (framework agnostic), which performs the verification check before allowing valid traffic to be processed by the API endpoint.

## Approov Integration Quickstart

The quickstart was tested with the following Operating Systems:

* Ubuntu 20.04

* MacOS Big Sur

* Windows 10 WSL2 - Ubuntu 20.04

First, setup the [Approov CLI](https://approov.io/docs/latest/approov-installation/index.html#initializing-the-approov-cli).

Now, register the API domain for which Approov will issues tokens:

```bash

approov api -add api.example.com

```

> **NOTE:** By default a symmetric key (HS256) is used to sign the Approov token on a valid attestation of the mobile app for each API domain it's added with the Approov CLI, so that all APIs will share the same secret and the backend needs to take care to keep this secret secure.

>

> A more secure alternative is to use asymmetric keys (RS256 or others) that allows for a different keyset to be used on each API domain and for the Approov token to be verified with a public key that can only verify, but not sign, Approov tokens.

>

> To implement the asymmetric key you need to change from using the symmetric HS256 algorithm to an asymmetric algorithm, for example RS256, that requires you to first [add a new key](https://approov.io/docs/latest/approov-usage-documentation/#adding-a-new-key), and then specify it when [adding each API domain](https://approov.io/docs/latest/approov-usage-documentation/#keyset-key-api-addition). Please visit [Managing Key Sets](https://approov.io/docs/latest/approov-usage-documentation/#managing-key-sets) on the Approov documentation for more details.

Next, enable your Approov `admin` role with:

```bash

eval `approov role admin`

````

For the Windows powershell:

```bash

set APPROOV_ROLE=admin:___YOUR_APPROOV_ACCOUNT_NAME_HERE___

```

Now, get your Approov Secret with the [Approov CLI](https://approov.io/docs/latest/approov-installation/index.html#initializing-the-approov-cli):

```bash

approov secret -get base64

```

Next, add the [Approov secret](https://approov.io/docs/latest/approov-usage-documentation/#account-secret-key-export) to your project `.env` file:

```env

APPROOV_BASE64_SECRET=approov_base64_secret_here

```

Now, to check the Approov token we will use the [jwt/ruby-jwt](https://github.com/jwt/ruby-jwt) package, that you can install with:

```bash

gem install jwt

```

> **NOTE:** If you are not using yet the `dotenv` package then you also nee to add it to the install command.

Next, add this code to your project:

```ruby

require 'dotenv'

require 'jwt'

require 'base64'

env = Dotenv.parse(".env")

if not env['HTTP_PORT']

    env['HTTP_PORTP'] = 8002

end

if not env['SERVER_HOSTNAME']

    env['SERVER_HOSTNAME'] = '127.0.0.1'

end

if not env['APPROOV_BASE64_SECRET']

    raise "Missing in the .env file the value for the variable: APPROOV_BASE64_SECRET"

end

APPROOV_SECRET = Base64.decode64(env['APPROOV_BASE64_SECRET'])

def verifyApproovToken headers

    begin

        approov_token = headers['approov-token']

        if not approov_token

            # You may want to add some logging here

            return nil

        end

        options = { algorithm: 'HS256' }

        approov_token_claims, header = JWT.decode approov_token, APPROOV_SECRET, true, options

        return approov_token_claims

    rescue JWT::DecodeError => e

        # You may want to add some logging here

        return nil

    rescue JWT::ExpiredSignature => e

        # You may want to add some logging here

        return nil

    rescue JWT::InvalidIssuerError => e

        # You may want to add some logging here

        return nil

    rescue JWT::InvalidIatError

        # You may want to add some logging here

        return nil

    end

    # You may want to add some logging here

    return nil

end

```

Now you just need to invoke `verifyApproovToken()` function for the endpoints you want to protected:

```ruby

if not approov_token_claims = verifyApproovToken(headers)

    sendResponse(connection, 401, JSON.generate({}))

    next

end

```

> **NOTE:** When the Approov token validation fails we return a `401` with an empty body, because we don't want to give clues to an attacker about the reason the request failed, and you can go even further by returning a `400`.

Not enough details in the bare bones quickstart? No worries, check the [detailed quickstarts](QUICKSTARTS.md) that contain a more comprehensive set of instructions, including how to test the Approov integration.

## More Information

* [Approov Overview](OVERVIEW.md)

* [Detailed Quickstarts](QUICKSTARTS.md)

* [Examples](EXAMPLES.md)

* [Testing](TESTING.md)

### System Clock

In order to correctly check for the expiration times of the Approov tokens is very important that the backend server is synchronizing automatically the system clock over the network with an authoritative time source. In Linux this is usually done with a NTP server.

### System Clock

In order to correctly check for the expiration times of the Approov tokens is very important that the backend server is synchronizing automatically the system clock over the network with an authoritative time source. In Linux this is usually done with a NTP server.

## Issues

If you find any issue while following our instructions then just report it [here](https://github.com/approov/quickstart-ruby-token-check/issues), with the steps to reproduce it, and we will sort it out and/or guide you to the correct path.

## Useful Links

If you wish to explore the Approov solution in more depth, then why not try one of the following links as a jumping off point:

* [Approov Free Trial](https://approov.io/signup)(no credit card needed)

* [Approov Get Started](https://approov.io/product/demo)

* [Approov QuickStarts](https://approov.io/docs/latest/approov-integration-examples/)

* [Approov Docs](https://approov.io/docs)

* [Approov Blog](https://approov.io/blog/)

* [Approov Resources](https://approov.io/resource/)

* [Approov Customer Stories](https://approov.io/customer)

* [Approov Support](https://approov.io/contact)

* [About Us](https://approov.io/company)

* [Contact Us](https://approov.io/contact)