REST API Key Authentication Method for WordPress | Secure REST API

Overview

REST API key authentication for WordPress involves verifying the API key (Bearer token) to gain access to the REST APIs for WordPress. Each time a request is initiated to access REST API endpoints, authentication is necessary using the key (Bearer token). Access to resources for the requested REST API endpoint for WordPress is granted based on the validation of the API key (Bearer token).
For the record, the API key is an authentication protocol designed to allow developers to generate authentication keys that could be used for resources such as server-side processes, mobile phone applications, and desktop computers.

The API key authentication method for WordPress is a vital means to ensure the security of your REST API for WordPress. If the API key becomes compromised, it can be regenerated, causing all previously generated keys to expire automatically. The newly created key will then be employed for API Key Authentication for WP. Failing to secure your REST API can pose significant security risks, as it can provide unauthorized individuals with access to your system, potentially leading to data breaches.

This guide will walk you through a detailed, step-by-step process for installing and configuring REST API Authentication for WordPress to enhance the security of your REST API.

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REST API Authentication for WordPress

REST API Authentication plugin for WordPress provides security from unauthorized access to your REST APIs for WordPress. Our plugin provides multiple authentication methods like Basic Authentication, API Key Authentication, OAuth 2.0 Authentication, and JWT Authentication.

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Pre-requisites : Download And Installation

• Log into your WordPress instance as an admin.
• Go to the WordPress Dashboard -> Plugins and click on Add New.
• Search for a REST API Authentication plugin for WordPress and click on Install Now.
• Once installed click on Activate.

Use Case: Protect/Secure REST API Endpoints Access for WordPress via Bearer Key/Token

1.  API Key authentication can serve as a safeguard for your REST API Endpoints for WordPress, such as posts, pages, or any other REST APIs of WordPress, shielding them from unauthorized access and negating the need to share a user's WP login credentials or client ID and client secret for authentication. This API key generator for WordPress approach creates a unique authentication key, which you can utilize to authenticate various REST APIs of WordPress on your website.

Utilizing the REST API key authentication for WordPress represents one of the easiest and most widely adopted approaches to fortifying your REST API with API key authentication. This approach enhances the security of REST APIs on your WordPress website.




2.   Imagine you've developed a Blog Application for Android and iOS, and you've published all your blogs on WordPress. However, you'd like to retrieve the posts/blogs from REST APIs of WordPress while keeping them inaccessible to the public. In such cases, it's advisable to implement REST API Key Authentication for WordPress to safeguard your GET requests, ensuring the security of your endpoints.

The plugin provides two kinds of API keys/ security tokens that can be used to authenticate REST APIs of WordPress-

I.   Universal API Key - The Universal API key will be most suitable to authenticate the REST APIs, which involve the HTTP GET method and do not require WordPress user capabilities.




Please note: This key does not involve user capabilities and cannot be used to access those APIs for which WordPress expects user permissions. “Example - If you just want to use the GET APIs for fetching general WordPress posts, comments, etc.”




II.   User-specific API Key - The user-based API will be the most suitable to authenticate the REST APIs that involve any of the HTTP methods like - GET, POST, PUT, DELETE, especially in those cases in which you want to perform operations that involve user capabilities.




Example - If you want to perform any operations like fetching WordPress posts based on user capabilities (their WP roles), user data, or want to create new users, new posts, etc.

Read Use Cases for the following Rest API Authentication Methods:

JWT Authentication

OAuth 2.0 Authentication

Basic Authentication

Third Party Provider Authentication

Setup API Authentication Plugin for WordPress [Premium]

• In the plugin, go to the Configure API Authentication tab and click on API Key Authentication as the API Authentication method.
• Once you save the configuration, Under the Universal API key section you will get the option to Generate New Token, Click on Generate New Key button. This key/token will expire when you generate a new key/token.
• Once you generate the API key (token), you can use it to secure your REST API endpoints for WordPress. (You can always generate the new API key, and all the existing generated keys will expire automatically).
• You need to pass the API Key to the Authorization header as a bearer token while making the REST API request to your WP site, as shown in the step below.
• Users who have this token can access the REST API as shown below.

Request: GET https://<domain-name>/wp-json/wp/v2/posts
Header:Authorization: Bearer <token>

Sample request:  GET https://<domain-name>/wp-json/wp/v2/posts
Header:Authorization: Bearer kGUfhhzXZuWisofgnkAsuHGDyfw7gfhg5s

Sample curl Request Format-
curl -H "Authorization:Bearer <token-value>"
-X GET http://<wp_base_url>/wp-json/wp/v2/posts
-H 'app-name:TheAppName'

• The Header is explained below.

   I. Authorization : The HTTP Authorization request header typically includes the user agent's credentials or token type and token value, serving as a means to authenticate the user agent with a server. This commonly occurs following an unsuccessful authentication attempt, where the server responds with a status of 401 Unauthorized.

   II. Bearer <token-value>: The Bearer <token-value> is created by the Authentication server. When a client application requests the authentication server then the server authenticates that token and gives a response to the client application accordingly.

• Check out the developer documentation for more details.
• Check out the Error Response for API key Authentication.

Code samples in programming languages

• C# - RestSharp
• Java - OkHttp
• JavaScript - JQuery
• PHP - cURL
• Python-https

 
var client = new RestClient("http://<wp_base_url>/wp-json/wp/v2/posts ");
client.Timeout = -1;
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "Bearer <token-value>");
request.AddHeader = ("app-name", "TheAppName");
IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content);

 
OkHttpClient client  = new OkHttpClient().newBuilder().build();
Request request  = new Request.Builder()
.url("http://<wp_base_url>/wp-json/wp/v2/posts ")
.method("GET", null)
.addHeader = ("Authorization", "Bearer <token-value>");
.addHeader = ("app-name", "TheAppName");
.build();
Response responseclient.newCall(request).execute();

 
var settings  = {
"url": "http://<wp_base_url>/wp-json/wp/v2/posts ",
"method": "GET",
"timeout": 0,
"headers": {
"Authorization": "Bearer < access_token / id_token >",
"app-name": "TheAppName"
},        
};

$.ajax(settings).done(function (response)  {
console.log(response);
});

 
<?php
 $curl = curl_init();
curl_setopt_array($curl, array 
(  
CURLOPT_URL => 'http://%3Cwp_base_url%3E/wp-json/wp/v2/posts',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => '',
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 0,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => 'GET',
CURLOPT_HTTPHEADER => array(
'Authorization: Bearer <token-value>'
'app-name: TheAppName'
),

));          

$response = curl_exec($curl);
curl_close($curl);    
echo $response;

 
import http.client

conn   = http.client.HTTPSConnection("<wp_base_url>")
payload= "
headers = {
'Authorization': 'Bearer <token-value>'
'app-name': 'TheAppName',
}
conn.request("GET", "/wp-json/wp/v2/posts ", payload, headers)
res= conn.getresponse()    
data = res.read()    
print (data.decode("utf-8"))   

Postman Samples:

Follow the steps below to make REST API request using Postman:

• Download the POSTMAN collection export from here.
• Import the downloaded JSON file into the Postman Application as shown below.

• Once you import the JSON file, click on the REST API request under the Collections as shown in the last figure. Now replace the <wp_base_url> with your Wordpress domain in the http://<wp_base_url>/wp-json/wp/v2/posts and replace the API <token-value> in the header with the token value as generated in the plugin.
• Example:

Feature Description

1. Role-Based REST API restriction:

This feature enables restricting REST API access according to user roles. You have the option to specify which roles should be permitted to access the requested resource through REST APIs. Therefore, when a user initiates a REST API request, their role is retrieved, and access to the resource is only granted if their role is included in the whitelist.

How to configure it?

• First, go to the plugin ‘Advanced Settings’ tab.
• In the Role-based Restriction section, initially, all roles are granted access to the APIs by default. However, you can selectively limit access by enabling the checkbox next to the roles you wish to restrict.

• In the above screenshot, the subscriber role checkbox is enabled. So whenever an API request is made by the user with his role as subscriber then that user won’t be allowed to access the requested resource.

Note: The Role-based restriction feature is valid for Basic authentication (Username: password), JWT method, OAuth 2.0 (Password grant), and API Key Auth (User-specific API key).

2. Custom Header

This feature provides an option to choose a custom header rather than the default ‘Authorization’ header. This will enhance security by introducing a custom-named header. If an individual attempts to send a REST API request with an 'Authorization' header, they will be unable to access the APIs.

How to configure it?

• First, go to the plugin ‘Advanced Settings’ tab.
• Then in the ‘Custom Header’ section, you can edit the textbox to enter the custom name you want.

3. Exclude REST APIs

This feature allows you to create a whitelist for your REST APIs, enabling direct access to them without the need for authentication. Consequently, all REST APIs included in this whitelist become publicly accessible.

How to configure it?

• First, go to the plugin ‘Advanced Settings’ tab.
• Then in the ‘Exclude REST APIs’, you can enter your APIs in the prescribed format which needs to be whitelisted for public access.

• Example: Suppose you want to exclude the REST API ‘ /wp-json/wp/v2/posts’ then you have to enter ‘/wp/v2/posts’ in the textbox.

4. Create User Specific API keys/tokens

• This feature is available within the API key method, allowing tokens to be generated based on user-specific information rather than a randomly generated token which is a universal key.
• When using the Universal API key/token, users may lack the necessary permissions to access specific REST APIs of WordPress with request methods like POST, PUT, or DELETE. These APIs involve actions such as creating users, posts, pages, etc., which require specific user permissions or roles for operation. The limitation arises because the universal key is randomly generated and does not include user-specific details.
• The User-based API key/token feature empowers users to utilize REST APIs of WordPress with request methods like POST, PUT, and DELETE, which mandate user credentials or specific roles for functionality. When a REST API request for WordPress is executed using the user-based key, the system retrieves the user's role and grants access solely if the user possesses the necessary permissions.
• For Example: Only users with administrator and editor roles have permission to create/edit/delete a post.
• So, if a request is made to this API to create/delete/edit the post, the API response will result in “You are not allowed to perform this operation”.
• Now, if a request is made with the user-based token generated for the user that has an administrator or editor role, only they have access to this API and can operate (create/update/delete) via the API call.

How to use this feature:

• Select the user from the dropdown and click on the Create API Key button.

• A pop-up will appear on the screen, you just need to click on the OK button to copy the token.

• Now this token can be used with the API request just like the universal key is used to make the API request.

Congratulations! You have successfully configured the REST API Key Authentication for WordPress using this guide. Now, your REST API endpoints of WordPress are secure, and your data is protected from unauthorized access.

Related Articles

• REST API Basic Authentication Method for WordPress
• REST API OAuth 2.0 Authentication Method for WordPress

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