The responsibility of the inbound authenticators component is to identify and parse all the incoming authentication requests and then build the corresponding response. A given inbound authenticator has two parts.
- Request Processor
- Response Builder
For each protocol supported by the WSO2 Identity Server, there should be an inbound authenticator. The Identity Server includes inbound authenticators for SAML 2.0, OpenID Connect, OAuth 2.0, Kerberos KDC, WS-Trust STS and WS-Federation (passive). The responsibility of the SAML 2.0 request processor is to accept a SAML request from a service provider, validate the SAML request and then build a common object model understood by the authentication framework and handover the request to it. The responsibility of the SAML response builder is to accept a common object model from the authentication framework and build a SAML response out of it.
Both the request processors and the response builders are protocol aware, while the authentication framework is not coupled to any protocol. See Architecture for more information on the complete flow where inbound authenticators come into play.
You can configure the following for inbound authentication.
OpenID 2.0 has been removed from the base product in WSO2 Identity Server version 5.3.0 onwards as it is now an obsolete specification and has been superseded by OpenID Connect. Alternatively, we recommend that you use OpenID Connect instead.
- Expand the SAML2 Web SSO Configuration and click Configure.
- Select one of the following modes:
Metadata and URL configuration
When configuring a service provider (SP) or a federated identity provider (Federated IdP), the user is required to enter configuration data to facilitate exchanging authentication and authorization data between entities in a standard way. Apart from manual entering of configuration data, WSO2 IS allows you to upload configuration data using a metadata XML file or refer to a metadata XML file located in a predetermined URL. These two methods of uploading configuration data enable faster entry of configuration data because it allows the user to use the same metadata xml file for multiple instances of entity configuration. In addition to SAML metadata upload, WSO2 IS also supports SAML metadata download for the resident identity provider.
- Select Manual Configuration and fill in the form that appears.
- Click Register.
The following points should be taken into consideration when filling the above New Service Provider form.
|Issuer||Specify the Issuer. This is the ||travelocity.com|
|Assertion Consumer URLs||Specify the Assertion Consumer URLs. This is the URL to which the browser should be redirected to after the authentication is successful. This is the Assertion Consumer Service (ACS) URL of the service provider. The identity provider redirects the SAML2 response to this ACS URL. However, if the SAML2 request is signed and SAML2 request contains the ACS URL, the Identity Server will honor the ACS URL of the SAML2 request. It should have this format: https://(host-name):(port)/acs. You can add multiple assertion consumer URLs for the service provider by entering the URL and clicking the Add button.||http://wso2is.local:8080/travelocity.com/home.jsp|
|Default Assertion Consumer URL|
Since there can be multiple assertion consumer URLs, you must define a Default Assertion Consumer URL in case you are unable to retrieve it from the authentication request.
Tip: In a service provider initiated single sign-on setup, the following needs to be considered.
In an identity provider initiated single sign-on setup, the following needs to be considered.
Specify the NameID format. This defines the name identifier formats supported by the identity provider. The service provider and identity provider usually communicate with each other regarding a specific subject. That subject should be identified through a Name-Identifier (NameID) , which should be in some format so that It is easy for the other party to identify it based on the format. Name identifiers are used to provide information regarding a user.
About NameID formats
For SSO interactions, you can use the following types of NameID formats.
This specifies the name identifier format that the Identity Server wants to receive in the subject of an assertion from a particular identity provider. The following is the default format used by the identity provider.
Select the Certificate Alias from the dropdown. This is used to validate the signature of SAML2 requests and is used to generate encryption. Basically the service provider’s certificate must be selected here. Note that this can also be the Identity Server tenant's public certificate in a scenario where you are doing a tenant specific configuration.
|Response Signing Algorithm|
Specifies the ‘SignatureMethod’ algorithm to be used in the ‘Signature’ element in POST binding. The default value can be configured in the
|Response Digest Algorithm|
Specifies the ‘DigestMethod’ algorithm to be used in the ‘Signature’ element in POST binding. The default value can be configured in the
|Assertion Encryption Algorithm||The algorithm that the SAML2 assertion is encrypted. The default value can be configured in the ||www.w3.org/2001/04/xmlenc#aes256-cbc|
|Key Encryption Algorithm||The algorithm that the SAML2 key is encrypted. The default value can be configured in the ||www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p|
|Enable Response Signing||Select Enable Response Signing to sign the SAML2 Responses returned after the authentication process.||Selected|
|Enable Signature Validation in Authentication Requests and Logout Requests||Select Enable Signature Validation in Authentication Requests and Logout Requests if you need this functionality configured. This specifies whether the identity provider must validate the signature of the SAML2 authentication request and the SAML2 logout request that are sent by the service provider.||Unselected|
|Enable Assertion Encryption||Enable Assertion Encryption, if you wish to encrypt the assertion.||Unselected|
|Enable Single Logout||Select Enable Single Logout so that all sessions are terminated once the user signs out from one server. If single logout is enabled, the identity provider sends logout requests to all service providers. Basically, the identity provider acts according to the single logout profile. If the service provider supports a different URL for logout, you can enter a SLO Response URL and SLO Request URL for logging out. These URLs indicate where the request and response should go to. If you do not specify this URL, the identity provider uses the Assertion Consumer Service (ACS) URL.||Selected|
|Enable Attribute Profile||Select Enable Attribute Profile to enable this and add a claim by entering the claim link and clicking the Add Claim button. The Identity Server provides support for a basic attribute profile where the identity provider can include the user’s attributes in the SAML Assertions as part of the attribute statement. Once you select the checkbox to Include Attributes in the Response Always, the identity provider always includes the attribute values related to the selected claims in the SAML attribute statement.||Unselected|
|Enable Audience Restriction||Select Enable Audience Restriction to restrict the audience. You may add audience members using the Audience text box and clicking the Add button.||Unselected|
|Enable Recipient Validation||Select this if you require validation from the recipient of the response.||Unselected|
|Enable IdP Initiated SSO||Select the Enable IdP Initiated SSO checkbox to enable this functionality. When this is enabled, the service provider is not required to send the SAML2 request.||Unselected|
|Enable IdP Initiated SLO||Select the Enable IdP Initiated SLO checkbox to enable this functionality. You must specify the URL.||Unselected|
|Enable Assertion Query Request Profile||Select the Enable Assertion Query Request Profile checkbox to query assertions that are persisted to the database when you login to the service provider application. For more information, see Querying SAML Assertions.||Unselected|
Metadata file configuration
This option allows you to provide the configuration data required for configuring SAML2, by uploading a metadata .xml file instead of having to manually enter the values. This enables faster entry of configuration data and allows the user to use the same metadata XML file for multiple instances of entity configuration.
- Select Metadata File Configuration.
- Click Choose File, and select the .xml file containing the metadata for the service provider SAML configuration.
Click Upload.Click here to view a sample of the metadata configuration file
Metadata for a service provider may be published in a well known location via a URI. This option allows you to provide the configuration data required for configuring SAML2, by providing a URI(Ex: " instead of having to manually enter the values. This enables faster entry of configuration data and allows the user to use the same metadata XML file for multiple instances of entity configuration. ")
- Select URL Configuration and enter the URL containing the service provider metadata.
- Click Upload.
- Click here to expand for more information on signature algorithms.
The following table provides the list of signature algorithms available and their respective URI.
Signature algorithm name Signature algorithm URI DSA with SHA1 ECDSA with SHA1 ECDSA with SHA256 ECDSA with SHA384 ECDSA with SHA512 RSA with MD5 RSA with RIPEMD160 RSA with SHA1 RSA with SHA256 RSA with SHA384 RSA with SHA512
- Click here to expand for more information on digest algorithms.
The following table provides the list of digest algorithms available and their respective URI.
Digest algorithm name Digest algorithm URI MD5 RIPEMD160 SHA1 SHA256 SHA384 SHA512
If you need to sign the SAML response using an authenticated user's tenant keystore, please add the following configuration. (By default, the response is signed using the certificate that belongs to the tenant where the service provider is registered). This property must be added if the SAML authenticator version in the WSO2 Carbon products that you are using is 4.2.2 or higher (
<UseAuthenticatedUserDomainCrypto>property available in the
<IS_HOME>/repository/conf/identity.xmlfile as shown below.
To enable OAuth support for your client application, you must first register your application. Follow the instructions below to add a new application.
Let's get started to configure the service provider you created!
- Expand the Inbound Authentication Configuration section and then expand OAuth/OpenID Connect Configuration. Click Configure.
Fill in the form that appears. For the Allowed Grant Types you can disable the ones you do not require or wish to block.
Note: The grant type highlighted below is a custom grant type. This will only appear on the UI if you have configured the JWT grant type. The value specified in the
<GrantTypeName>property of the
identity.xmlfile when creating the custom grant type is the value that will appear on the UI. For more information on writing a custom grant type, see Writing a Custom OAuth 2.0 Grant Type.
When filling out the New Application form, the following details should be taken into consideration.
Field Notes OAuth Version
Selecting OAuth Version as 1.0a removes all the configurable Allowed Grant Types. This is because this version of OAuth does not support grant types.
This is the exact location in the service provider's application where an access token would be sent. This is a required field (if the grant type is anything other than 'Code' or 'Implicit') and it is important to configure, as it is imperative that the service provider receives the access token. This is necessary for security purposes to ensure that the token is not compromised.
Configure multiple callback URLs
From IS 5.2.0 onwards, regex-based consumer URLs are supported when defining the callback URL. This enables you to configure multiple callback URLs for one application by entering a regex pattern as the value for the callback URL field.
For example, if you have two service providers that use the same application, you can now define a regex pattern which will work for both callback URLs instead of having to configure two different applications for the two service providers. Assume the two callback URLs for your two service providers are as follows:
To configure the callback URL to work for both of these URLs, set it using a regex pattern as follows:
You must have the prefix 'regexp=' before your regex pattern. To define a normal URL, you can specify the callback URL without this prefix.Allowed Grant Types - The following are the grant types that are used to get the access token:
Entering the username and password required at the service provider will result in a code being generated. This code can be used to obtain the access token. For more information on this grant type, see this Authorization Code specification.
This is similar to the code grant type, but instead of generating a code, this directly provides the access token. For more information on this grant type, see this Implicit Grant specification.
This authenticates the user using the password provided and the access token is provided. For more information on this grant type, see this Resource Owner Password Credentials Grant specification.
Client Credential This is the grant type for the client key and client secret. If these two items are provided correctly by the service provider, the access token is sent. For more information on this grant type, see this Client Credentials specification. Refresh Token This will enable the user to obtain an access token by using the refresh token once the originally provided access token is used up. For more information on this grant type, see this Refresh Token specification. SAML
This uses SAML assertion to obtain the access token. For more information on this grant type, see this SAML2 Bearer specification.
IWA-NTLM This is similar to the password grant type, but it is specific to Microsoft Windows users. urn:ietf:params:oauth:grant-type:jwt-bearer This is a custom grant type. It uses a JWT token to obtain the access token. For more information about this grant type, see this JWT specification. PKCE Mandatory Select this if you are using the Code grant type. PKCE is a recommended security measure used to mitigate a code interception attack. See Mitigating Authorization Code Interception Attacks for more information. Support PKCE 'Plain' Transform Algorithm Select this if you are using PKCE.
User Access Token Expiry Time, Application Access Token Expiry Time, Refresh Token Expiry Time
Set the validity period (in seconds) for User Access Token, Application Access Token, and Refresh Token.
- Click Add. The following information is added for your service provider.
- OAuth Client Key - This is the client key of the service provider, which will be checked for authentication by the Identity Server before providing the access token.
- OAuth Client Secret - This is the client secret of the service provider, which will be checked for authentication by the Identity Server before providing the access token. Click the Show button to view the exact value of this.
- Actions -
Edit: Click to edit the OAuth/OpenID Connect Configurations
Revoke: Click to revoke (deactivate) the OAuth application. This action revokes all tokens issued for this application. In order to activate the application, you have to regenerate the consumer secret.
Regenerate Secret: Click to regenerate the secret key of the OAuth application.
Delete: Click to delete the OAuth/OpenID Connect Configurations
Tip: The OAuth client key and client secret are stored in plain text. To encrypt the client secret, access token and refresh token, do the following:
identity.xmlfile found in the
<IS_HOME>/repository/conf/identitydirectory and change the
<TokenPersistenceProcessor>property as follows:
After updating the configuration, make sure to restart the server for the changes to be applied on WSO2 IS.
To request a SAML 2.0 security token, the Request Security Token (RST) should be sent to the passive STS endpoint with the TokenType 'SAMLV2.0' when sending the token request. If there is no RST specified, the WSO2 Identity Server will issue a SAML 1.1 token by default.
Configuring passive STS
- See here for details on adding a service provider.
Expand the Inbound Authentication Configuration followed by the WS-Federation (Passive) Configuration section and provide the following values.
- Passive STS Realm - This should be an unique identifier for the web app. Provide the same realm name given to the web app you are configuring WS-Federation for.
Passive STS WReply URL - Provide the URL of the web app you are configuring WS-Federation for. This endpoint URL will handle the token response.
If you want to configure an expiration time for the security token, you need to add the following configuration in the
<IS_HOME>/repository/conf/carbon.xmlfile, under the
Here, the expiration time should be specified in milliseconds.
- Expand the Claim Configuration section and map the relevant claims. See Configuring Claims for a Service Provider for more information.
- Click Update to save changes.
Currently the signing algorithm used for passive STS by default is
rsa-sha1 and the digest algorithm used is
sha1. To change the default algorithms, add the following configuration under the
<security> tag in the
carbon.xml file found in the
<IS_HOME>/repository/conf directory. The example given below sets the signing algorithm to
rsa-sha256 and the digest algorithm to
To configure this, apply the 4664 WUM update to WSO2 IS 5.6.0 using the WSO2 Update Manager (WUM). To deploy a WUM update into production, you need to have a paid subscription. If you do not have a paid subscription, you can use this feature with the next version of WSO2 Identity Server when it is released. For more information on updating WSO2 Identity Server using WUM, see Getting Started with WUM in the WSO2 Administration Guide.
UserNameTokenor with any other WS-Security mechanism as explained below.
Securing the Security Token Service
According to the Trust Brokering model defined in the WS-Trust specification, the users should authenticate themselves to the STS before obtaining a token. STS may use this authentication information when constructing the security token. For example, STS may populate the required claims based on the user name provided by the subject. Therefore, the STS service needs to be secured.
- Log in as an admin to access the management console.
- Configure the Resident Identity Provider. See here for more detailed information on how to do this.
- In the Resident Identity Provider page, expand the Inbound Authentication Configuration section along with the Security Token Service Configuration section.
- Click Apply Security Policy.
Select Yes in the Enable Security? dropdown and select a pre-configured security scenario according to your requirements. In this case, we will use UsernameToken under the Basic Scenarios section.
You can find further details about security policy scenarios from the view scenario option.
Next steps may vary as per the security scenario that you have chosen under point (5) above. Below is for UsernameToken scenario.
- Select ALL-USER-STORE-DOMAINS from the drop-down.
In the resulting page, select the role you created to grant permission to access secured service. In this example, the admin role is used. Next, click Finish.
The Select Domain drop-down lists many domains. The listed User Groups can vary depending on the domain selected.
- Click Ok on the confirmation dialog window that appears.
- Click Update to complete the process.
Now STS is configured and secured with a username and password. Only users with the Admin role can consume the service.
The next step is to add a service provider to consume the STS.
Adding a service provider for the STS client
Do the following steps if you are using a Holder of Key subject confirmation method. See Configuring STS for Obtaining Tokens with Holder-Of-Key Subject Confirmation for more information.
The Subject confirmation methods define how a relying party (RP), which is the end service can make sure a particular security token issued by an STS is brought by the legitimate subject. If this is not done, a third party can take the token from the wire and send any request it wants including that token. The RP trusts that illegitimate party.
- See Configuring a Service Provider for details on adding a service provider.
- Expand the Inbound Authentication Configuration section and the WS-Trust Security Token Service Configuration section. Click Configure.
In the resulting screen, enter the trusted relying party's endpoint address that is the endpoint address of the Security Token Service. For more information, see Broker Trust Relationship with WSO2 Identity Server and upload the public certificate of the trusted relying party.
You need to add the certificate of the relying party to the truststore. For more information on how to create the certificate and add it to the truststore, see here.
The endpoint must be used as the service
URLto which the token gets delivered by the STS client. Then select the public certificate imported. Tokens issued are encrypted using the public certificate of the trusted relying party. Therefore, the consumer who obtains this token, to invoke the RP service, won't be able to see the token.
Click Update to save the changes made to the service provider.