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https://github.com/approov/quickstart-php-token-check
Quickstart Approov integration example for PHP without depending on a framework.
https://github.com/approov/quickstart-php-token-check
api api-security approov approov-backend approov-backend-quicksart approov-integration approov-quickstart backend php security
Last synced: 3 months ago
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Quickstart Approov integration example for PHP without depending on a framework.
- Host: GitHub
- URL: https://github.com/approov/quickstart-php-token-check
- Owner: approov
- Created: 2020-09-16T14:50:23.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2024-08-05T11:10:03.000Z (6 months ago)
- Last Synced: 2024-08-05T12:56:37.716Z (6 months ago)
- Topics: api, api-security, approov, approov-backend, approov-backend-quicksart, approov-integration, approov-quickstart, backend, php, security
- Language: PHP
- Homepage: https://approov.io
- Size: 67.4 KB
- Stars: 2
- Watchers: 8
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Approov QuickStart - PHP 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 PHP (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
```
> **@IMPORTANT:**
> Don't set an Approov key id for the secret, because the JWT library doesn't support to pass the symmetric key for the Approov secret in a JWKs.
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, add to your project the [firebase/php-jwt](https://github.com/firebase/php-jwt) package to check the JWT token:
```bash
composer require firebase/php-jwt
```
Next, add this code to your project:
```php
$env = Dotenv\Dotenv::createArrayBacked(__DIR__)->load();
if (empty($env['APPROOV_BASE64_SECRET'])) {
throw new Exception("Missing in the .env file the variable: APPROOV_BASE64_SECRET");
}
define('APPROOV_BASE64_SECRET', base64_decode($env['APPROOV_BASE64_SECRET'], true));
function verifyApproovToken(Array $headers): ?stdClass {
try {
if (empty($headers['Approov-Token'])) {
// You may want to add some logging here
return null;
}
$approov_token = $headers['Approov-Token'];
// The Approov secret cannot be given as part of a JWKS key set,
// therefore you cannot use the Approov CLI to set a key id for it.
//
// If you set the key id then the token check will fail due to the
// presence of a `kid` key in the header of the Approov token, that
// will not be found in the `$approov_secret` variable, because this
// variable contains the secret as a binary string, not as a JWKs
// key set.
return \Firebase\JWT\JWT::decode($approov_token, constant('APPROOV_BASE64_SECRET'), ['HS256']);
} catch(\UnexpectedValueException $exception) {
// You may want to add some logging here
return null;
} catch(\InvalidArgumentException $exception) {
// You may want to add some logging here
return null;
} catch(\DomainException $exception) {
// You may want to add some logging here
return null;
}
// You may want to add some logging here
return null;
}
```
Now you just need to invoke `verifyApproovToken()` function for the endpoints you want to protected:
```php
$headers = getallheaders();
$approov_token_claims = verifyApproovToken($headers);
if (!$approov_token_claims) {
sendResponse(401, []);
exit;
}
```
> **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.
## Issues
If you find any issue while following our instructions then just report it [here](https://github.com/approov/quickstart-php-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)