make saml auth request option forceauthn configurable

Author: DaanHoogland

plugins/user-authenticators/saml2/src/main/java/org/apache/cloudstack/saml/SAML2AuthManager.java

@@ -73,6 +73,9 @@ public interface SAML2AuthManager extends PluggableAPIAuthenticator, PluggableSe
     ConfigKey<Boolean> SAMLCheckSignature = new ConfigKey<Boolean>("Advanced", Boolean.class, "saml2.check.signature", "true",
             "When enabled (default and recommended), SAML2 signature checks are enforced and lack of signature in the SAML SSO response will cause login exception. Disabling this is not advisable but provided for backward compatibility for users who are able to accept the risks.", false);
 
+    ConfigKey<Boolean> SAMLForceAuthn = new ConfigKey<Boolean>("Advanced", Boolean.class, "saml2.force.authn", "false",
+            "When enabled (default false), SAML2 will force a new authentication. This can be useful if multiple application use different saml logins from the same application (I.E. browser)", true);
+
     SAMLProviderMetadata getSPMetadata();
     SAMLProviderMetadata getIdPMetadata(String entityId);
     Collection<SAMLProviderMetadata> getAllIdPMetadata();

plugins/user-authenticators/saml2/src/main/java/org/apache/cloudstack/saml/SAML2AuthManagerImpl.java

@@ -542,6 +542,6 @@ public ConfigKey<?>[] getConfigKeys() {
                 SAMLServiceProviderSingleSignOnURL, SAMLServiceProviderSingleLogOutURL,
                 SAMLCloudStackRedirectionUrl, SAMLUserAttributeName,
                 SAMLIdentityProviderMetadataURL, SAMLDefaultIdentityProviderId,
-                SAMLSignatureAlgorithm, SAMLAppendDomainSuffix, SAMLTimeout, SAMLCheckSignature};
+                SAMLSignatureAlgorithm, SAMLAppendDomainSuffix, SAMLTimeout, SAMLCheckSignature, SAMLForceAuthn};
     }
 }

plugins/user-authenticators/saml2/src/main/java/org/apache/cloudstack/saml/SAMLUtils.java

@@ -189,7 +189,7 @@ public static AuthnRequest buildAuthnRequestObject(final String authnId, final S
         authnRequest.setID(authnId);
         authnRequest.setDestination(idpUrl);
         authnRequest.setVersion(SAMLVersion.VERSION_20);
-        authnRequest.setForceAuthn(false);
+        authnRequest.setForceAuthn(SAML2AuthManager.SAMLForceAuthn.value());
         authnRequest.setIsPassive(false);
         authnRequest.setIssueInstant(new DateTime());
         authnRequest.setProtocolBinding(SAMLConstants.SAML2_POST_BINDING_URI);