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Note: This is a draft version of this document.

This topic provides instructions on how to configure the JWT grant type. See the following sections for more information.

Deploying artifacts 

  • Place the  org.wso2.carbon.identity.oauth2.grant.jwt-1.0.0.jar downloaded from store in the <IS_HOME>/repository/component/dropins directory.
  • To register the JWT grant type, configure the <IS_HOME>/repository/conf/identity/identity.xml file by adding a new entry under the <OAuth><SupportedGrantTypes> element. Add a unique identifier between the <GrantTypeName> tags as seen in the code block below.

    <SupportedGrantType>
        <GrantTypeName>urn:ietf:params:oauth:grant-type:jwt-bearer</GrantTypeName>
        <GrantTypeHandlerImplClass>org.wso2.carbon.identity.oauth2.grant.jwt.JWTBearerGrantHandler</GrantTypeHandlerImplClass>
        <GrantTypeValidatorImplClass>org.wso2.carbon.identity.oauth2.grant.jwt.JWTGrantValidator</GrantTypeValidatorImplClass>
    </SupportedGrantType>
  • Restart the server.

Configure the JWT grant type

  1. Sign in to the WSO2 Identity Server. Enter your username and password to log on to the Management Console
  2. In the Identity Providers section under the Main tab of the management console, click Add.
  3. Provide the following values to configure the IDP:
    • Identity Provider Name: Enter a issuer name(which is used to generate the JWT assertion) as the IDP  name.
    • Identity Provider Public Certificate:   The certificate used to sign the JWT assertion. 

    • Alias: Give the name of the alias if the Identity Provider identifies this token endpoint by an alias. E.g., https://localhost:9443/oauth2/token
    See  Adding a new identity provider for more information.
  4. Navigate to the Main menu to access the Identity menu. Click Add under Service Providers.
  5. Fill in the Service Provider Name and provide a brief Description of the service provider. See Adding a Service Provider for more information.
  6. Expand the OAuth/OpenID Connect Configuration and click Configure.
  7. Enter a callback url for example http://localhost:8080/playground2/oauth2client and click Add.
  8. The OAuth Client Key and OAuth Client Secret will now be visible.

The flow

The cURL commands below can be used to retrieve access token and refresh token using a JWT.

Request
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 flag should specify the “<Client Id>:<Client Secret>” value. The assertion parameter value is the signed base64 encoded JWT. The value of the assertion parameter  MUST contain a  single JWT. You can refer JWT Bearer Grant  to more information about assertion.

If you have configured the service provider and identity provider in a tenant, you have to add the tenant domain as a query parameter to the access token endpoint.

If the tenant domain is wso2.com, access token endpoint will be as follows.

Sample request
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

You would have now received the response from the token endpoint. The response would contain the access token, refresh token, expiry time and token type

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

 

JWT Bearer Grant

JWT contains three parts which are separated by dots(.): header, payload, and a signature. The header identifies which algorithm is used to generate the signature.

For example,

Sample header
{
	"alg":"RS256"
}

{"alg":"RS256”}

The payload contains the claims which are mentioned below:

  • iss (issuer) - The JWT must contain an iss(issuer) claim that contains a unique identifier that identifies the Identity Provider that issued the JWT.
  • sub (subject) - The JWT must contain a sub(subject) claim that identifies the entity that the 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. 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 the JWT can be used.
  • nbf (not before) - The JWT may contain a nbf (not before time) claim that forces a JWT to be used only after a specified time.
  • iat (issued at) - The JWT may contain an iat (issued at) claim that identifies the time at which the JWT was issued.
  • jti (json web token Id) - The JWT may 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.

For example,

Sample payload
{
	"exp":1461233946,
	"sub":"admin",
	"nbf":1461173946,
	"aud":"https:\/\/localhost:9443\/oauth2\/token",
	"iss":"jwtIdp",
	"jti":"Token56756",
	"iat":1461173946
}

 

The signature is calculated by base64url encoding the header and payload and concatenating them with a period as a separator and signing it:

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

The signature must then be Base64url encoded. Now JWT assertion can be generateb by concatenating these three encoded values with a seperator dot(.).

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

The result is as follows:

Sample assertion
eyJhbGciOiJSUzI1NiJ9.eyJleHAiOjE0NjEyMzM5NDYsInN1YiI6ImFkbWluIiwibmJmIjoxNDYxMTczOTQ2LCJhdWQiOlsiaHR0cHM6XC9cL2xvY2FsaG9zdDo5NDQzXC9vYXV0aDJcL3Rva2VuIiwid3NvMi1JUyJdLCJpc3MiOiJqd3RJZHAiLCJqdGkiOiJUb2tlbjU2NzU2IiwiaWF0IjoxNDYxMTczOTQ2fQ.OYUJyfR_UhKuPWNJw-Nl8Gxcj14prnhcKWX5alg577A6dx9YUfPNIBer6KIc5zEKEeiBUIqrz_MA9uh2NoBOTyUBiDiTbGxpT_YPejxVVhEvQ8ZbFcY-Ma957rdsqOsVWRMHfeReJbxCdE8cjimGP4sutkKKYlCIhlLh1U_Xz2w


 

 

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