Honor turnOffChangeSessionIdOnLogin in SAML adapter (#187)

Closes keycloak/keycloak-private#183

Signed-off-by: rmartinc <rmartinc@redhat.com>

Author: rmartinc

Diff for: adapters/saml/wildfly-elytron/src/main/java/org/keycloak/adapters/saml/elytron/ElytronSamlSessionStore.java

@@ -31,13 +31,9 @@
 import org.keycloak.adapters.spi.SessionIdMapper;
 import org.keycloak.adapters.spi.SessionIdMapperUpdater;
 import org.keycloak.common.util.KeycloakUriBuilder;
-import org.keycloak.saml.processing.core.saml.v2.util.XMLTimeUtil;
 import org.wildfly.security.http.HttpScope;
 import org.wildfly.security.http.Scope;
 
-import javax.xml.datatype.DatatypeConstants;
-import javax.xml.datatype.XMLGregorianCalendar;
-
 /**
  * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
  * @version $Revision: 1 $
@@ -174,8 +170,12 @@ public void saveAccount(SamlSession account) {
     }
 
     protected String changeSessionId(HttpScope session) {
-        if (!deployment.turnOffChangeSessionIdOnLogin()) return session.getID();
-        else return session.getID();
+        if (!deployment.turnOffChangeSessionIdOnLogin()) {
+            if (!session.supportsChangeID() || !session.changeID()) {
+                log.debug("Session ID cannot be changed although turnOffChangeSessionIdOnLogin is set to false");
+            }
+        }
+        return session.getID();
     }
 
     @Override

Diff for: testsuite/integration-arquillian/test-apps/servlets/src/main/java/org/keycloak/testsuite/adapter/servlet/InputServlet.java

@@ -40,6 +40,7 @@ protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws Se
         String appBase = ServletTestUtils.getUrlBase();
         String actionUrl = appBase + "/input-portal/secured/post";
 
+        req.getSession(true);
         if (req.getRequestURI().endsWith("insecure")) {
             if (System.getProperty("insecure.user.principal.unsupported") == null) Assert.assertNotNull(req.getUserPrincipal());
             resp.setContentType("text/html");
@@ -65,6 +66,7 @@ protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws Se
 
     @Override
     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        req.getSession(true);
         if (!FORM_URLENCODED.equals(req.getContentType())) {
             resp.setStatus(HttpServletResponse.SC_BAD_REQUEST);
             PrintWriter pw = resp.getWriter();

Diff for: testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/adapter/servlet/SAMLServletAdapterTest.java

@@ -1129,6 +1129,7 @@ public void idpInitiatedUnauthorizedLoginTest() {
     public void testSavedPostRequest() {
         inputPortalPage.navigateTo();
         assertCurrentUrlStartsWith(inputPortalPage);
+        String sessionId = driver.manage().getCookieNamed("JSESSIONID").getValue();
         inputPortalPage.execute("hello");
 
         assertCurrentUrlStartsWith(testRealmSAMLPostLoginPage);
@@ -1139,6 +1140,7 @@ public void testSavedPostRequest() {
         // test that user principal and KeycloakSecurityContext available
         driver.navigate().to(inputPortalPage + "/insecure");
         waitUntilElement(By.xpath("//body")).text().contains("Insecure Page");
+        Assert.assertNotEquals("SessionID has not been changed at login", sessionId, driver.manage().getCookieNamed("JSESSIONID").getValue());
 
         if (System.getProperty("insecure.user.principal.unsupported") == null) waitUntilElement(By.xpath("//body")).text().contains("UserPrincipal");