[GSoC 2015: Hawk Authentication] Making Hawk client requests with PHP

Submitted by Dragooon on Tue, 06/30/2015 - 17:25

The core aim of my Summer of Code project is to allow Drupal to authenticate using the Hawk protocol, a very crucial part of that is for clients to be able to communicate with the server. This post applies to generally any Hawk client-server combination but I'll be specifically referring to my PHP Hawk library as client and my Drupal module as the server.

Hawk is a relatively new protocol developed as an alternative to OAuth using a simple approach. In a nutshell, every client makes a request with an Authorization header containing a MAC (Message Authentication Code) and some additional data for the server to be able to identify and verify the client.

Obtaining the credentials

Every hawk credential has three pieces of information, the ID, key and the algorithm (sha1, sh256 etc) with which every request is hashed. The ID is like the username and is transmitted in plaintext with every request, it is used by the server to identify which client is trying to identify. The key is never transmitted by the client to the server but is used to sign the request the client is sending, this way the server can verify by signing the request with the key it has. If both the signatures match, the client is who it says it is. For more detailed explaination of the protocol, see the official documentation. To get started, we don't need to worry about the details of the protocol.

The ID, key and algorithm on an average would be provided by server to the client, ID and Key can be any alphanumeric string but the Drupal Hawk module limits ID to an integer (key is still a 32 character randomly generated string). For example, using a screenshot of the profile area of the module:

UI Screenshot

Here there are two credentials identifying the same profile (hence having the same result) with the ID, Key and algorithm. The client script can generate a credentials object like (taking the first credential as an example):

<?php $credentials = new \Dragooon\hawk\Credentials\Credentials('LAMqXvfADLJMsba5UZwx4VrWmsoLRvYX', 'sha256', 10); ?>

This can be used in subsequent requests below

Making Anonymous REST requests using cURL

I'll be using cURL but any HTTP library for PHP would be generally the same, just the options would be needed to be adapted for that specific library. Drupal for example, has the REST endpoint for a node with the ID 1 at /node/1?_format=json (Note: _format=json in URL for REST is adopted after beta 11, currently Git HEAD). Here is a sample code for making a GET request on that end point anonymously

<?php

$request_url = 'http://example.com/drupal/node/1?_format=json';

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $request_url);
curl_setopt($ch, CURLOPT_VERBOSE, TRUE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, FALSE);
curl_setopt($ch, CURLOPT_HEADER, TRUE);

$response = curl_exec($ch);

curl_close($ch);

echo $response;

?>

Signing requests by Hawk for authentication

Requests need to be signed by Hawk in order to generate the appropriate headers for sending to the server in order to authenticate the client which can be done by the Client class in the library. Using the above credentials, here is an example:

<?php

$client = \Dragooon\Hawk\Client\ClientBuilder::create()->build();
$request = $client->createRequest(
  $credentials, // Declared above
  $request_url, // Same as the one being used by cURL
  $method, // GET, POST etc...
  [

    'payload' => '', // Payload (optional), relevant mostly for POST

     'content-type' => '', // Content-type (optional), relevant mostly if there is any payload

  ]
);

?>

The $request->headers() object will contain the appropriate header values, $request->header()->fieldName() will contain the name of the Header to pass (generally Authorization) and $request->header()->fieldValue() will contain the value it should contain. cURL can be passed these values as:

<?php

curl_setopt($ch, CURLOPT_HTTPHEADER, array(
  $request->header()->fieldName() . ': ' . $request->header()->fieldValue(),
));

?>

Putting it all together

Once the header is being passed, Drupal will automatically treat the request as being from the user the credential belongs to. Here is a summation of the above codes:

<?php

$request_url = 'http://example.com/drupal/node/1?_format=json'; 

$credentials = new \Dragooon\hawk\Credentials\Credentials('LAMqXvfADLJMsba5UZwx4VrWmsoLRvYX', 'sha256', 10);

$request = $client->createRequest(
  $credentials, // Declared above
  $request_url,
  $method, // GET, POST etc...
  []
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $request_url);
curl_setopt($ch, CURLOPT_VERBOSE, TRUE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, FALSE);
curl_setopt($ch, CURLOPT_HEADER, TRUE);

curl_setopt($ch, CURLOPT_HTTPHEADER, array(
  $request->header()->fieldName() . ': ' . $request->header()->fieldValue(),
));

$response = curl_exec($ch);

curl_close($ch);

echo $response;

?>

That's it for now! Changing the end points will allow you to access different areas, POST can be used in combination of payload and content-type to make content editing/creating requests.

Thank you!

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