Feature: Block authentication flow originating from a web view (mobile app)

jans-auth-server/model/src/main/java/io/jans/as/model/configuration/AppConfiguration.java

@@ -809,6 +809,9 @@ public class AppConfiguration implements Configuration {
     @DocProperty(description = "SSA Configuration")
     private SsaConfiguration ssaConfiguration;
 
+    @DocProperty(description = "Enable/Disable block authorizations that originate from Webview (Mobile apps).", defaultValue = "false")
+    private Boolean blockWebviewAuthorizationEnabled = false;
+
     public List<SsaValidationConfig> getDcrSsaValidationConfigs() {
         if (dcrSsaValidationConfigs == null) dcrSsaValidationConfigs = new ArrayList<>();
         return dcrSsaValidationConfigs;
@@ -3085,4 +3088,12 @@ public SsaConfiguration getSsaConfiguration() {
     public void setSsaConfiguration(SsaConfiguration ssaConfiguration) {
         this.ssaConfiguration = ssaConfiguration;
     }
+
+    public Boolean getBlockWebviewAuthorizationEnabled() {
+        return blockWebviewAuthorizationEnabled;
+    }
+
+    public void setBlockWebviewAuthorizationEnabled(Boolean blockWebviewAuthorizationEnabled) {
+        this.blockWebviewAuthorizationEnabled = blockWebviewAuthorizationEnabled;
+    }
 }

jans-auth-server/server/conf/jans-config.json

@@ -449,5 +449,6 @@
         "defaultResponseHeaders": {
             "Cache-Control": "max-age=0, no-store"
         }
-    }
+    },
+    "blockWebviewAuthorizationEnabled": false
 }

jans-auth-server/server/src/main/java/io/jans/as/server/authorize/ws/rs/AuthorizeRestWebServiceImpl.java

@@ -168,6 +168,8 @@ public Response requestAuthorizationGet(
             String codeChallenge, String codeChallengeMethod, String customResponseHeaders, String claims, String authReqId,
             HttpServletRequest httpRequest, HttpServletResponse httpResponse, SecurityContext securityContext) {
 
+        authorizeRestWebServiceValidator.validateNotWebView(httpRequest);
+
         AuthzRequest authzRequest = new AuthzRequest();
         authzRequest.setHttpMethod(HttpMethod.GET);
         authzRequest.setScope(scope);
@@ -210,6 +212,8 @@ public Response requestAuthorizationPost(
             String codeChallenge, String codeChallengeMethod, String customResponseHeaders, String claims, String authReqId,
             HttpServletRequest httpRequest, HttpServletResponse httpResponse, SecurityContext securityContext) {
 
+        authorizeRestWebServiceValidator.validateNotWebView(httpRequest);
+
         AuthzRequest authzRequest = new AuthzRequest();
         authzRequest.setHttpMethod(HttpMethod.POST);
         authzRequest.setScope(scope);

jans-auth-server/server/src/main/java/io/jans/as/server/authorize/ws/rs/AuthorizeRestWebServiceValidator.java

@@ -458,4 +458,14 @@ public void checkSignedRequestRequired(AuthzRequest authzRequest) {
             throw createInvalidJwtRequestException(authzRequest.getRedirectUriResponse(), "A signed request object is required");
         }
     }
+
+    public void validateNotWebView(HttpServletRequest httpRequest) {
+        if (appConfiguration.getBlockWebviewAuthorizationEnabled()) {
+            String headerRequestedWith = httpRequest.getHeader("X-Requested-With");
+            if (headerRequestedWith != null) {
+                log.error("Unauthorized, request contains X-Requested-With: {}", headerRequestedWith);
+                throw new WebApplicationException(Response.status(Response.Status.UNAUTHORIZED).build());
+            }
+        }
+    }
 }

jans-auth-server/server/src/test/java/io/jans/as/server/authorize/ws/rs/AuthorizeRestWebServiceValidatorTest.java

@@ -9,16 +9,17 @@
 import io.jans.as.server.service.DeviceAuthorizationService;
 import io.jans.as.server.service.RedirectionUriService;
 import io.jans.as.server.service.SessionIdService;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.ws.rs.WebApplicationException;
 import org.mockito.InjectMocks;
 import org.mockito.Mock;
 import org.mockito.testng.MockitoTestNGListener;
 import org.slf4j.Logger;
 import org.testng.annotations.Listeners;
 import org.testng.annotations.Test;
 
-import static org.mockito.Mockito.when;
-import static org.testng.Assert.assertFalse;
-import static org.testng.Assert.assertTrue;
+import static org.mockito.Mockito.*;
+import static org.testng.Assert.*;
 
 /**
  * @author Yuriy Z
@@ -74,4 +75,33 @@ public void isAuthnMaxAgeValid_whenMaxAgeIsZeroAndDisableAuthnForMaxAgeZeroIsTru
     public void isAuthnMaxAgeValid_whenMaxAgeIsNull_shouldReturnTrue() {
         assertTrue(authorizeRestWebServiceValidator.isAuthnMaxAgeValid(0, new SessionId(), new Client()));
     }
+
+    @Test
+    public void validateNotWebView_blockWebviewDisabled_valid() {
+        HttpServletRequest httpServletRequest = mock(HttpServletRequest.class);
+        when(appConfiguration.getBlockWebviewAuthorizationEnabled()).thenReturn(false);
+
+        authorizeRestWebServiceValidator.validateNotWebView(httpServletRequest);
+        verifyNoInteractions(log, httpServletRequest);
+    }
+
+    @Test
+    public void validateNotWebView_blockWebviewEnabled_valid() {
+        HttpServletRequest httpServletRequest = mock(HttpServletRequest.class);
+        when(appConfiguration.getBlockWebviewAuthorizationEnabled()).thenReturn(true);
+
+        authorizeRestWebServiceValidator.validateNotWebView(httpServletRequest);
+        verifyNoInteractions(log);
+    }
+
+    @Test
+    public void validateNotWebView_withRequestedWithHeader_throwUnauthorized() {
+        HttpServletRequest httpServletRequest = mock(HttpServletRequest.class);
+        when(appConfiguration.getBlockWebviewAuthorizationEnabled()).thenReturn(true);
+        String testPackage = "test.app.package";
+        when(httpServletRequest.getHeader(any())).thenReturn(testPackage);
+
+        assertThrows(WebApplicationException.class, () -> authorizeRestWebServiceValidator.validateNotWebView(httpServletRequest));
+        verify(log).error(anyString(), eq(testPackage));
+    }
 }

jans-linux-setup/jans_setup/openbanking/templates/jans-auth/jans-auth-config.json

@@ -394,5 +394,6 @@
     "staticKid": "%(static_kid)s",
     "forceOfflineAccessScopeToEnableRefreshToken" : false,
     "redirectUrisRegexEnabled": false,
-    "useHighestLevelScriptIfAcrScriptNotFound": true
+    "useHighestLevelScriptIfAcrScriptNotFound": true,
+    "blockWebviewAuthorizationEnabled": false
 }

jans-linux-setup/jans_setup/templates/jans-auth/jans-auth-config.json

@@ -497,5 +497,6 @@
         "defaultResponseHeaders": {
             "Cache-Control": "max-age=0, no-store"
         }
-    }
+    },
+    "blockWebviewAuthorizationEnabled": false
 }