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, 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.
- Expand the SAML2 Web SSO Configuration and click Configure.
- 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. You can add multiple assertion consumer URLs for the service provider by entering the URL and clicking the Add button.||http://localhost: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
|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.||Selected|
|Enable Assertion Encryption||Enable Assertion Encryption, if you wish to encrypt the assertion.||Selected|
|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.||Selected|
|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.||Selected|
|Enable Recipient Validation||Select this if you require validation from the recipient of the response.||Selected|
|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.||Selected|
|Enable IdP Initiated SLO||Select the Enable IdP Initiated SLO checkbox to enable this functionality. You must specify the URL.||Selected|
- 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.
- Expand the OAuth/OpenID Connect Configuration and 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.
- 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.
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:
When filling out the New Application form, the following should be taken into consideration.
- 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.
- The Callback Url is the exact location in the service provider's application where an access token would be sent. This is a required field and 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.
- The following are the grant types that are used to get the access token.
- Code - Entering the user name and password required at the service provider will result in a code being generated. This code can be used to obtain the access token.
- Implicit - This is similar to the code grant type, but instead of generating a code, this directly provides the access token.
- Password - This authenticates the user using the password provided and the access token is provided.
- 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.
- 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.
- SAML - This uses SAML as the grant type to obtain the access token.
- IWA-NTLM - This is similar to the password grant type, but it is specific to Microsoft Windows users.
- Expand the OpenID Configuration.
- Enter the identifier for the OpenID Realm as specified in the form below. This identifier need to be specified as identification when the service provider reaches out to the Identity Server.
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 uniquely identifies 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 handles 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.
UserNameTokenor with any other WS-Security mechanism.
STS is configured under the Resident Identity Provider section of the Identity Server Management Console. Use the following step to do the configurations.
- 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 UsernameToken under the Basic Scenarios section.
- Click Next.
- In the resulting page, select the admin checkbox and click Finish.
- Click Ok on the confirmation dialog window that appears and 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
- See here 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 Endpoint Address. This must be used as the service URL and the token is delivered by the STS client.
- Click Update to save the changes made to the service provider.