WordPress REST API OAuth 2.0 Authentication Method
OAuth 2.0 is the most opted method for authenticating access to the APIs. OAuth 2.0 allows authorization without the need providing user's email address or password to external application. This method of WordPress REST API OAuth 2.0 Authentication involves the use of OAuth 2.0 protocol flow to obtain the security access token or id token (JWT token) and that token will be used to authenticate the WordPress REST API endpoints. Each time a request to access the WordPress REST API endpoint will be made, the authentication will be done against that access token/id token (JWT token), and on the basis of the verification of that API Bearer token, the resources for that API request will be allowed to access.
The token provided using the OAuth 2.0 Authentication Method is highly encrypted and secure, hence security is not compromised. It is the most secure method to authenticate/ protect WordPress REST API endpoints. This method is somewhat similar to the JWT authentication method but far more secure due to various benefits of OAuth 2.0 protocol.
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 WordPress REST API Authentication plugin and click on Install Now.
- Once installed click on Activate.
UseCase: Securing REST API with OAuth 2.0 Authentication Method
1. Password Grant:
Use Case: Register WordPress user or Authenticate /login users in external platforms based on WordPress credentials via WordPress REST API
Suppose you have a login form in your application and want to authenticate
the user on the basis of their WordPress login credentials, then OAuth 2.0
Authentication in REST API method will help you in achieving that. The
plugin provides a WordPress login API. You can easily pass the WordPress
credentials of that user to this API and based on the validation, you will
receive the authentication and response.
Also, Implementing OAuth 2.0 Authentication in REST API method can also be
used to register users in WordPress using the admin credentials of
WordPress user. Using the plugin OAuth 2.0 token endpoint, you can pass
WordPress user credentials which have administrator capabilities such that
token generated will have admin capabilties can be used to perform
operations like user registration for which administrative privileges are
required. Once you have the token, you can use this token with wordPress
‘/users’ API to register users in WordPress via REST API request.
2. Client Credentials:
Use Case: Authenticate/ protect WordPress REST API Endpoints securely or register users in WordPress without using admin user credentials.
If you want to access the WordPress REST API without passing the WordPress
user credentials or want to register the users in WordPress securely
without need to pass the admin user credentials of WordPress and instead
pass the client credentials provided by the plugin, then this method is
the perfect solution such that there won’t be any chance of user
credentials getting compromised.
The plugin acts both as a OAuth 2.0 Identity provider(Server) which
provides the token and REST APIs authenticator for authentication of these
WordPress REST API endpoints on the basis of the token. Hence it provides
utmost security to obtain the token and that token can be used to
authenticate the REST API request.
- The flow for implementing OAuth 2.0 Authentication method in REST API methods is explained below:
1. The REST API request will be made with appropriate parameters to obtain the token for our plugin. Our plugin will act as an OAuth 2.0 Identity provider and provides the access token.
2. The actual REST API request to access the resource will be made with the access token received from the last step passed in the Authorization header with token type as Bearer. The plugin now acts as Authenticator to authenticate the API on the basis of token validity. If the token is validated successfully then the API requester will be allowed to access the resource else on the failed validation the error response will be returned.
Related Usecase:
- How to login or register users using WordPress REST API?
- How to authenticate WordPress users using the API?
Read Use Cases for the following Rest API Authentication Methods:
WordPress REST API OAuth 2.0 using Password Grant:
- In the plugin, go to the Configure API Authentication tab and click on OAuth 2.0 Authentication as the API Authentication method.
- Select the OAuth 2.0 grant Type as Password Grant.
-
Now you can opt for any of the Token Type as Access Token or JWT Token.
The Access Token is random string associated with the user for whom it is generated while the JWT Token or id-token is formed as per JWT standard which consits of user detials encoded in it for whom the token is generated. This token can be decoded using its key and the user details can be parsed. Hence this token is recommended in those cased in which user WP profile detials needs to be fetched later on. - Now click on Save Configuration button to save the OAuth 2.0 authentication settings and enable this authenticate method to secure WordPress REST API endpoints.
- Once you click on the Save Configuration, you will get the Client ID, Client Secret & Token Endpoint (the endpoint to which an API call need to be made to receive the security token).
- Now, you would need to make two calls:
- To get the access token/JWT Token, you would need to make an API Call to OAuth 2.0 Token endpoint provided by our plugin shown as below
Now the plugin setup part has been done successfully. Below comes the part in which the actual security access/JWT token will be obtained and used further for accessing the WordPress REST APIs.
I : Get the Token
Request: POST https://<domain-name>/wp-json/api/v1/token
Body:
grant_type =<password>
username =<wordpress username>
password = <wordpress password>
client_id =<client id>
Sample curl Request Format-
curl -d "grant_type=password&username=<wordpress_username>&password=<wordpress_password>&client_id=<client_id>"
-X POST http://<wp_base_url>/wp-json/api/v1/token
Request: POST https://<domain-name>/wp-json/api/v1/token
Body:
grant_type = <refresh_token>
refresh_token = <Refresh Token>
Sample curl Request Format-
curl -d "grant_type=refresh_token&refresh_token=<refresh_token>&client_id=<client_id>&client_secret=<client_secret>"
-X POST http://<wp_base_url>/wp-json/api/v1/token
II : Send actual WordPress REST API Request
- Once you get the access_token / id_token (JWT token) using the OAuth 2.0 password grant flow, you can use it to request the access to the WordPress REST API endpoints as shown below.
Request: GET https://<domain-name>/wp-json/wp/v2/posts
Header: Authorization :Bearer <access_token /id_token>
WordPress REST API OAuth 2.0 using Client Credentials Grant:
- In the plugin, go to the Configure API Authentication tab and click on OAuth 2.0 Authentication as the API Authentication method.
- Now Select the OAuth 2.0 grant Type as Client Credentials Grant.
- Once you click on the save configuration, you will get the Client ID, Client Secret and Token Endpoint.
- Here you would need to make two calls:
- After saving above configuration, you will get the Client ID, Client-Secret & Token Endpoint.
- get the token, you need to send a token request as shown below
I : Get the Token
Request: POST https://<domain-name>/wp-json/api/v1/token
Body:
grant_type = <client_credentials>
client_id = <client id>
client_secret = <client secret>
Sample curl Request Format-
curl -d "grant_type=client_credentials&client_id=<client_id>&client_secret=<client_secret>"
-X POST http://<wp_base_url>/wp-json/api/v1/token
Request: POST https://<domain-name>/wp-json/api/v1/token
Body:
grant_type = <refresh_token>
refresh_token = <Refresh Token>
Sample curl Request Format-
curl -d "grant_type=refresh_token&refresh_token=<refresh_token>&client_id=<client_id>&client_secret=<client_secret>"
-X POST http://<wp_base_url>/wp-json/api/v1/token
II : Send API Request
- Once you get the access_token / id_token by OAuth 2.0 client credentials, you can use it to request the access to the WordPress REST API endpoint as shown below.
Request: GET https://<domain-name>/wp-json/wp/v2/posts
Header: Authorization : Bearer <access_token /id_token>Additional Security Features
This method provides you with additional secuirty facilities which allow you have more control over the tokens and hence the security of your website -
1. Refresh Token -
You can enable this option if you want to
receive the a string which is a refresh token as well along with access-token or JWT token in
the token endpoint request. It will allow the user to access the same resources as he was granted earlier. With the
new token created, user shuldn't get access beyond the original grant.
The refresh tokens allow authorization servers to use short time-periods (lifetime) for access tokens without needing
to involve the user on token expiration.
With this token you can regenerate the access-token/JWT token as they are meant to expire shortly to increase
security.
2. Revoke Token -
Enabling this option allows you to revoke the existing access-token/JWT token to
make it invalid and hence the particular token cannot be used to authenticate the WP REST APIs. The RESTful API
validates the application credentials first and whether the token was issued to the application making the
revocation request.
In case the validation is not successful, the particular request is refused and error is shown in the application.
The API invalidates the token and the token cannot be used again after its revocation. Each revocation request
invalidates the tokens that were issued for the same type of
authorization grant.
Code samples in programming languages
var client = new RestClient("http://<wp_base_url>/wp-json/api/v1/token ");
client.Timeout = -1;
var request = new RestRequest(Method.POST);
request.AlwaysMultipartFormDatatrue;
request.AddParameter("grant_type", "client_credentials");
request.AddParameter("client_id", "<client_id>");
request.AddParameter("client_secret", "<client_secret>");
IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content);
OkHttpClient client = new OkHttpClient().newBuilder().build();
MediaType mediaType = MediaType.parse("text/plain");
RequestBody body = new MultipartBody.Builder().setType(MultipartBody.FORM)
.addFormDataPart("grant_type", "client_credentials");
.addFormDataPart("client_id", "<client_id>");
.addFormDataPart("client_secret", "<client_secret>");
.build();
Request request = new Request.Builder()
.url("http://<wp_base_url>/wp-json/api/v1/token ")
.method("POST", null)
.build();
Response responseclient.newCall(request).execute();
var form = new FormData();
form.append("grant_type", "client_credentials");
form.append("client_id", "<client_id>");
form.append("client_secret", "<client_secret>");
var settings = {
"url": "http://<wp_base_url>/wp-json/api/v1/token ",
"method": "POST",
"timeout": 0,
"processData": false,
"mimeType": "multipart/form-data",
"contentType": false,
"data": form
};
$.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/api/v1/token',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => '',
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 0,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => 'POST',
CURLOPT_POSTFIELDS => array('grant_type' => 'client_credentials','client_id' => '<client_id>','client_secret' => '<client_secret>'),
));
$response = curl_exec($curl);
curl_close($curl);
echo $response;
import http.client
import mimetypes
from codecs import encode
conn = http.client.HTTPSConnection("<wp_base_url>")
dataList= []
boundary = 'wL36Yn8afVp8Ag7AmP8qZ0SA4n1v9T'
dataList.append(encode('--' + boundary))
dataList.append(encode('Content-Disposition: form-data; name=grant_type;'))
dataList.append(encode('Content-Type: {}'.format('text/plain')))
dataList.append(encode(''))
dataList.append(encode("client_credentials"))
dataList.append(encode('--' + boundary))
dataList.append(encode('Content-Disposition: form-data; name=client_id;'))
dataList.append('Content-Type: {}'.format('text/plain')))
dataList.append(encode(''))
dataList.append(encode("<client_id>"))
dataList.append(encode('--'+ boundary))
dataList.append(encode('Content-Disposition: form-data; name=client_secret;'))
dataList.append(encode('Content-Type: {}'.format('text/plain')))
dataList.append(encode(''))
dataList.append(encode("<client_secret<"))
dataList.append(encode('--'+boundary+'--'))
dataList.append(encode(''))
body = b'\r\n'.join(dataList)
payload= body
headers = {
'Content-type': 'multipart/form-data; boundary={}'.format(boundary)
}
conn.request("POST", "/wp-json/api/v1/token ", payload, headers)
res= conn.getresponse()
data = res.read()
print (data.decode("utf-8"))
var client = new RestClient("http://<wp_base_url>/wp-json/api/v1/token ");
client.Timeout = -1;
var request = new RestRequest(Method.POST);
request.AlwaysMultipartFormDatatrue;
request.AddParameter("grant_type", "refresh_token");
request.AddParameter("client_id", "<client_id>");
request.AddParameter("client_secret", "<client_secret>");
request.AddParameter("refresh_token", "<refresh_token>");
IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content);
OkHttpClient client = new OkHttpClient().newBuilder().build();
MediaType mediaType = MediaType.parse("text/plain");
RequestBody body = new MultipartBody.Builder().setType(MultipartBody.FORM)
.addFormDataPart("grant_type", "refresh_token");
.addFormDataPart("client_id", "<client_id>");
.addFormDataPart("client_secret", "<client_secret>");
.addFormDataPart("refresh_token", "<refresh_token>");
.build();
Request request = new Request.Builder()
.url("http://<wp_base_url>/wp-json/api/v1/token ")
.method("POST", null)
.build();
Response responseclient.newCall(request).execute();
var form = new FormData();
form.append("grant_type", "refresh_token");
form.append("client_id", "<client_id>");
form.append("client_secret", "<client_secret>");
form.append("refresh_token", "<refresh_token>");
var settings = {
"url": "http://<wp_base_url>/wp-json/api/v1/token ",
"method": "POST",
"timeout": 0,
"processData": false,
"mimeType": "multipart/form-data",
"contentType": false,
"data": form
};
$.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/api/v1/token',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => '',
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 0,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => 'POST',
CURLOPT_POSTFIELDS => array('grant_type' => 'refresh_token','client_id' => '<client_id>','client_secret' => '<client_secret>','refresh_token' => '<refresh_token>'),
));
$response = curl_exec($curl);
curl_close($curl);
echo $response;
import http.client
import mimetypes
from codecs import encode
conn = http.client.HTTPSConnection("<wp_base_url>")
dataList= []
boundary = 'wL36Yn8afVp8Ag7AmP8qZ0SA4n1v9T'
dataList.append(encode('--' + boundary))
dataList.append(encode('Content-Disposition: form-data; name=grant_type;'))
dataList.append(encode('Content-Type: {}'.format('text/plain')))
dataList.append(encode(''))
dataList.append(encode("refresh_token"))
dataList.append(encode('--' + boundary))
dataList.append(encode('Content-Disposition: form-data; name=client_id;'))
dataList.append('Content-Type: {}'.format('text/plain')))
dataList.append(encode(''))
dataList.append(encode("<client_id>"))
dataList.append(encode('--'+ boundary))
dataList.append(encode('Content-Disposition: form-data; name=client_secret;'))
dataList.append(encode('Content-Type: {}'.format('text/plain')))
dataList.append(encode(''))
dataList.append(encode("<client_id>"))
dataList.append(encode('--'+ boundary))
dataList.append(encode('Content-Disposition: form-data; name=refresh_token;'))
dataList.append(encode('Content-Type: {}'.format('text/plain')))
dataList.append(encode(''))
dataList.append(encode("<refresh_token<"))
dataList.append(encode('--'+boundary+'--'))
dataList.append(encode(''))
body = b'\r\n'.join(dataList)
payload= body
headers = {
'Content-type': 'multipart/form-data; boundary={}'.format(boundary)
}
conn.request("POST", "/wp-json/api/v1/token ", payload, headers)
res= conn.getresponse()
data = res.read()
print (data.decode("utf-8"))
Postman Samples:
a) OAuth 2.0 password Grant method:
- Sample request to obtain token:
- You can download the postman request sample from here.
- Now extract the zip file and import the extracted json file into the postman application.
- Example
- Sample request format to request resources using the token obtained in the last step.
- You can download the postman request sample from here.
- Now extract the zip file and import the extracted json file into the postman application.
- Example
b) OAuth 2.0 Client Credentials Grant Method:
- Sample request to obtain token:
- You can download the postman request sample from here.
- Now extract the zip file and import the extracted json file into the postman application.
- Example
c) REST API request to obtain the actual resource:
- You can download the postman request sample from here.
- Now extract the zip file and import the extracted json file into the postman application.
- Example
Feature Description
- First, go to the plugin ‘Advanced Settings’ tab.
- Then, in the Role based Restriction section, all the roles by default will be allowed to access the APIs. You can enable the checkbox of the roles for which you want to restrict access.
- 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.
- 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.
- 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 if you want to exclude the REST API ‘ '<your domain> /wp-json/wp/v2/posts’ then you have to enter ‘/wp/v2/posts’ in the textbox.
- First, go to the plugin ‘Advanced Settings’ tab.
- Then in the ‘Token Expiry Configuration’ section, the access token validity and refresh token(used for OAuth 2.0 method) can be altered. By default the access token expiry time is set to 60 minutes and the refresh token expiry time is set to 14 days. Hence with this feature, the expiry can be adjusted accordingly as per the requirements.
1. Role Based REST API Restriction:
This feature allows restricting the REST API access based on the user roles. You can whitelist the roles for which you want to allow access to the requested resource for the REST APIs. So whenever a REST API request is made by a user, his role will be fetched and only allowed to access the resource if his role is whitelisted.
How to configure it?
Note: The Role based restriction feature is valid for Basic authentication (Username: password), JWT method, and OAuth 2.0 (Password grant).
2. Custom Header
This feature provides an option to choose a custom header rather than the default ‘Authorization’ header.
It will increase the security as you have the header named with your ‘custom name’, so if someone makes the REST API request with a header as ‘Authorization’ then he won’t be able to access the APIs.
How to configure it?
3. Exclude REST APIs
This feature allows you to whitelist your REST APIs so these can be accessed directly without any authentication. Hence all these whitelisted REST APIs are publicly available.
How to configure it?
4. Custom Token Expiry
This feature is applicable for JWT and OAuth 2.0 methods which uses time based tokens to authenticate the WordPress REST API endpoints. This feature allows you to set the custom expiry for the tokens such that the token will no longer be valid once the token expires.
How to configure it?
Need Help?
Mail us on apisupport@xecurify.com for quick guidance(via email/meeting) on your requirement and our team will help you to select the best suitable solution/plan as per your requirement.
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