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The JSON Web Token(JWT) is simply an a JSON string containing claim values. The JWT Bearer grant handler evaluates will evaluate and validates validate the claims in the JWT token, and issues issue an access token at the Authorization Server end.

WSO2 API Manager, as an OAuth 2.0 Authorization Server with its Key Manager features, can accept JWT Assertions from OAuth 2.0 clients as an means of resource owner authentication and authorization. Additionally, it can exchange the JWT token with OAuth 2.0 access tokens in order to access protected resources on behalf of the resource owner.

The

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Flow

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A client can exchange a JWT token to a an OAuth 2.0 access token using this grant type. After you create an application in   Once an application is created on the API Store, you need to generate the keys for the application must be generated. When the keys are generated, there will be a Service Provider is created for on the respective application on WSO2 API Manager (WSO2 API-M). WSO2 API Manager uses the Service Provider (SP) entity to obtain information with regard to the application, which is in the API Store. You need to create a Identity Provider (IdP), which corresponds to the Service Provider, on the WSO2 API-M Server. The IdP is responsible for creating and signing the JWT assertion, .  The service provider entity  is used by the WSO2 APIM server to obtain information of the application created on the API Store.  There needs to be an Identity Provider configuration corresponding to the IDP created on the WSO2 APIM Server as well. This IDP is who creates and signs the JWT assertion.  This is required so that the server can identify the issuer of the JWT and obtain the public certificate of the IdP in IDP, in order to validate the JWT. 

When a request is made to the token endpoint with the JWT grant type, the JWT assertion, the client key , and client  secret, the WSO2 API-M APIM Server will read the grant type and trigger the JWT Bearer Grant Handler. Then this This handler checks will check for the issuer of the JWT token and retrieves retrieve the IdP IDP configuration. It will then obtains obtain the public certificate of the IdP, which is IDP  stored in the IdP IDP configuration, and validates validate the JWT. Once the JWT is validated, it will create an OAuth2.0 access token for the application holding the provided client key and client secret.  

The following sub-sections explain

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Configuring the prerequisites to use the JWT Bearer grant

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Configuring the  Identity Provider and the Service Provider

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1. Sign in to the WSO2 API Store (https://localhost:9443/store).
2. Create a new application  only if the required if an application is already not available already. Anchorstep3step3
3. Generate the production and/or sandbox keys for the application.
4. Sign in to the WSO2 API Manager Management . Enter your username and password to log on to the Management Console (https://localhost:9443/carbon). 
5. Navigate to the Identity Providers section under the Main tab of the management console and click Add.
6. Provide the following values to configure the IdPIDP:
   • Identity Provider Name: Enter the JWT issuer name as the identity provider name. This is used to generate the JWT assertion.

   • Identity Provider Public Certificate: The certificate used to sign the JWT assertion. 

     Info
     title Identity provider Public Certificate
     The Identity Provider Public Certificate is the public certificate belonging to the identity provider. You need to update this certificate in order Uploading this is necessary to authenticate the response from the identity provider. This can be any certificate. If the identity provider is another API Manager or Identity Server, this can be a wso2.crt file. Follow the steps below to To create the identity provider certificate from the wso2carbon.jks file: Open , follow the steps below. 1. Open your Command Line interface, go to the <APIM_HOME>/repository/resources/security/directory , and run . Run the following command to generate the wso2.crt file . Code Block keytool -export -alias wso2carbon -file wso2.crt -keystore wso2carbon.jks -storepass wso2carbon You can find the generated 2. Once you run this command, the wso2.crt  file in the file is generated and can be found in the <APIM_HOME>/repository/resources/security/ directory. Click Choose File ,  and navigate to the location of the wso2.crt file, select the file and upload it. For this location in order to select and upload this file. See Using Asymmetric Encryption in the WSO2 Product Administration Guide for more information on how public keys work and how to sign these keys using by a certification authority , see Using Asymmetric Encryption in the WSO2 Administration Guide .

   • Alias: If Give the name of the alias if the Identity Provider identifies this token endpoint by an alias (e.g., https://localhost:9443/oauth2/token), enter the name of the alias. 
For more information, see Adding and Configuring an Identity Provider in the WSO2 Identity Server documentationa new identity provider.
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7. Navigate to the Main menu to access the Identity menu. Click List under Service Providers.
8. Check if there is a Service Provider provider listed for the application , which you used to generate the keys in step 3.  The Service Provider name will have the following the  format .
   <application owner>_<application name>_<generated key type>
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Using the JWT grant

After you have configured the prerequistes required to use the JWT Bearer grant, you can use the following cURL command to retrieve a The cURL commands below can be used to retrieve the access token and refresh the token using a JWT.

curl -i -X POST -u <clientid>:<clientsecret> -k -d 'grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer&assertion=<JWT>' -H 'Content-Type: application/x-www-form-urlencoded' https://localhost:9443/oauth2/token

• The -u - This flag  flag should specify the “<Client Id>:<Client Secret>” value.
• assertion - The  The assertion parameter value is the the signed base64 encoded JWT that is signed. The value of the assertion parameter MUST contain a single JWT. For You can refer JWT Bearer Grant for more information , see JWT Assertionabout assertion.
  
  

Access Token Endpoint: https://localhost:9443/oauth2/token?tenantDomain=wso2.com

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curl -i -X POST -H 'Content-Type: application/x-www-form-urlencoded' -u bBhEoE2wIpU1zB8HA3GfvZz8xxAa:RKgXUC3pTRQg9xPpNwyuTPGtnSQa -k -d 'grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer&assertion=eyJhbGciOiJSUzI1NiJ9.eyJleHAiOjE0NTgxNjY5ODUsInN1YiI6ImFkbWluIiwibmJmIjoxNDU4MTA2OTg1LCJhdWQiOlsiaHR0cHM6XC9cL2xvY2FsaG9zdDo5NDQzXC9vYXV0aDJcL3Rva2VuIiwid3NvMi1JUyJdLCJpc3MiOiJqd3RJRFAiLCJqdGkiOiJUb2tlbjU2NzU2IiwiaWF0IjoxNDU4MTA2OTg1fQ.ZcxdoTVEsWoil80ne42QzmsfelMWyjRZJEjUK1c2vMZJjjtrZnsWExyCA5tN6iXYFAXC_7rkFuuNSgOlBi51MNLPZw3WcgGI52j6apGEW92V2tib9zRRWOeLQLAdo8ae8KzLp7kuKZ2XunfQ2WYU9TvvLDm_vp5ruuYz3ZZrJOc' https://localhost:9443/oauth2/token

Response

The following is You would have now received the response that you receive from the token endpoint based on the sample request. The response contains would contain the access token, refresh token, expiry time , and the token type. 

{"token_type":"Bearer","expires_in":3600,"refresh_token":"b1b4b78e2b0ef4956acb90f2e38a8833","access_token":"615ebcc943be052cf6dc27c6ec578816"} 

The JWT Assertion

JWT contains three parts that are separated by dots ".", namely the : header, payload, and a signature. The header identifies the algorithm used to generate the signature.

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• iss (issuer) - The JWT must contain an iss (issuer) claim that contains a unique identifier that identifies the Identity Provider identity provider that issued the JWT.
• sub (subject) - The JWT must contain a sub (subject) claim that identifies the entity that the Identity Provider identity provider or the entity that issued the JWT vouches for.
• aud (audience) - The JWT must contain an aud (audience) claim which containing a value that identifies the authorization server as an intended audience. You should register this value as a This value should be registered as token endpoint alias in the Identity Provider.
• exp (expiration time) - The JWT must contain an exp (expiration) claim that limits the time window during which you can use the JWT can be used.
• nbf (not before) - The JWT may contain a nbf (not before time) claim that determines forces a specific time after which the JWT can to be used only after a specified time.
• iat (JSON issued issued at) - The JWT may contain an iat (issued at) claim that identifies the time at which the JWT is was issued.
• jti (JSON json web token ID) - The JWT may contain an contain jti (JWT ID) claim that provides a unique identifier for the token.
• Other custom claims - JWT may contain claims other than the above mentioned ones. This is the extension point of the JWT specification.

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{  
   "sub":"admin",
   "aud":[  
      "https://localhost:9443/oauth2/token"
   ],
   "nbf":1507546100,
   "iss":"jwtIDP",
   "exp":1507606100,
   "iat":1507546100,
   "jti":"Token56756"
}

Generating a JWT assertion

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The signature is calculated by base64 URL encoding the header and payload and concatenating them with a period as a separator and signing it:

Signature = sign(encodeBase64(header) + '.' + encodeBase64(payload))

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The signature must then be base64 URL

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encoded. JWT assertion can be generated by concatenating these three encoded values with a separator dot "."

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assertion =  encodeBase64(header) + '.' + encodeBase64(payload) + '.' + encodeBase64(signature)

The result is as follows:

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eyJhbGciOiJSUzI1NiJ9.eyJzdWIiOiJhZG1pbiIsImF1ZCI6WyJodHRwczpcL1wvbG9jYWxob3N0Ojk0NDNcL29hdXRoMlwvdG9rZW4iXSwibmJmIjoxNTA3NTQ2MTAwLCJpc3MiOiJqd3RJRFAiLCJleHAiOjE1MDc2MDYxMDAsImlhdCI6MTUwNzU0NjEwMCwianRpIjoiVG9rZW41Njc1NiJ9.iGMhjibB0W2QFQlM27gnHp6z47Eybv8cAHk2o2i-xqo2S4uJ_1VppFI4CCJXTj4qzV9vmkJ5HKNAayiTa6wOMXGL4XnwYwpOAoKXvboznlEDNRpw3htW34nLvyUu6PjHbdvAPVjh8kPRwf7esRr2p-luecGvC21mjWdhyGzM4hE