Enabling SAML SP-Initiated web single sign-on (SSO)
By default, the WebSphere® Application Server SAML Trust Association Interceptor (TAI) supports IdP-initiated SSO. When custom code is in place, the SAML TAI can be configured to support SP-initiated SSO.
Before you begin
This task assumes that you have enabled your system to use the SAML web SSO feature. If you have not done this yet, see Enabling your system to use the SAML web single sign-on (SSO) feature.
About this task
This task provides an example class and the steps to configure SP-initiated SSO.
Procedure
- Develop a SAML authentication request provider that implements the
com.ibm.wsspi.security.web.saml.AuthnRequestProvider interface. The method getAuthnRequest(HttpServletRequest req, String errorMsg, String acsUrl, ArrayList<String> ssoUrls) must return a map that includes four entries with the following keys:
- AuthnRequestProvider.SSO_URL
- The SAML identity provider's Single-Sign-On URL.
- AuthnRequestProvider.RELAY_STATE
- The relayState as defined by the SAML Web Browser single-sign-on profile.
- AuthnRequestProvider.REQUEST_ID
- The value for this key must match the ID attribute's value in the AuthnRequest message.
- AuthnRequestProvider.AUTHN_REQUEST
- A Base64 encoded AuthnRequest message as defined in the spec. Your code is responsible for generating the AuthnRequest message.
public HashMap <String, String> getAuthnRequest(HttpServletRequest req, String errorMsg, String acsUrl, ArrayList<String> ssoUrls) throws NotImplementedException { //create map with following keys HashMap <String, String> map = new HashMap <String, String>(); String ssoUrl = "https://example.com/saml20/Login"; map.put(AuthnRequestProvider.SSO_URL, ssoUrl); String relayState = generateRandom(); map.put(AuthnRequestProvider.RELAY_STATE, relayState); String requestId = generateRandom(); map.put(AuthnRequestProvider.REQUEST_ID, requestId); //create AuthnRequest String authnMessage = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +"<samlp:AuthnRequest xmlns:samlp=\"urn:oasis:names:tc:SAML:2.0:protocol\" " +"ID=\""+requestID+"\" Version=\"2.0\" " + "IssueInstant=\"" +getUTC()+ "\" ForceAuthn=\"false\" IsPassive=\"false\"" + "ProtocolBinding=\"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST\" " + "AssertionConsumerServiceURL=\"" +acs+"\" " + "Destination=\"" +destination +"\"> " + "<saml:Issuer xmlns:saml=\"urn:oasis:names:tc:SAML:2.0:assertion\">" + issuer +"</saml:Issuer> <samlp:NameIDPolicy" +"Format=\"urn:oasis:names:tc:SAML:2.0:nameid-format:transient\"" +"SPNameQualifier=\"mysp\"" +"AllowCreate=\"true\" /> <samlp:RequestedAuthnContext Comparison=\"exact\"> " +"<saml:AuthnContextClassRef xmlns:saml=\"urn:oasis:names:tc:SAML:2.0:assertion\">" +"urn:oasis:names:tc:SAML:2.0:ac:classes:</samlp:RequestedAuthnContext> </samlp:AuthnRequest>"; map.put(AuthnRequestProvider.AUTHN_REQUEST, authnMessage); return map; }
- Put a jar file that contains your custom class in the (WAS_HOME)/lib/ext directory.
- Configure the SAML web SSO TAI to use your AuthnRequest message.
- Log on to the WebSphere Application Server administrative console.
- Click Security > Global security.
- Expand Web and SIP security and click Trust association.
- Click Interceptors.
- Click com.ibm.ws.security.web.saml.ACSTrustAssociationInterceptor
- For Custom properties, click new, then complete
the following custom property information, where id is what you assigned to the SSO
Service Provider (SP) for which you want this property to apply:
- Name: sso_<id>.sp.login.error.page
- Value: The class name of your custom AuthnRequestProvider implementation.


http://www14.software.ibm.com/webapp/wsbroker/redirect?version=cord&product=was-nd-mp&topic=tsec_enable_saml_sp_sso
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