fix: adds additional info / warnings to hostname v2 (keycloak#33261)

* fix: adds additional info / warnings to hostname v2

closes: keycloak#24815

Signed-off-by: Steve Hawkins <shawkins@redhat.com>

* refining the proxy-headers language from keycloak#33209

Signed-off-by: Steve Hawkins <shawkins@redhat.com>

* adding hostname-strict-https

Signed-off-by: Steve Hawkins <shawkins@redhat.com>

* moving removed property check to the quarkus side

Signed-off-by: Steve Hawkins <shawkins@redhat.com>

* Update quarkus/runtime/src/main/java/org/keycloak/quarkus/runtime/configuration/mappers/HostnameV2PropertyMappers.java

Co-authored-by: Martin Bartoš <mabartos@redhat.com>
Signed-off-by: Steven Hawkins <shawkins@redhat.com>

* Update docs/guides/server/hostname.adoc

Signed-off-by: Steven Hawkins <shawkins@redhat.com>

---------

Signed-off-by: Steve Hawkins <shawkins@redhat.com>
Signed-off-by: Steven Hawkins <shawkins@redhat.com>
Co-authored-by: Martin Bartoš <mabartos@redhat.com>

docs/guides/server/hostname.adoc

@@ -48,7 +48,7 @@ The result of this configuration is that you can continue to access {project_nam
 
 == Using a reverse proxy
 
-When a proxy is in use, the `proxy-headers` should be set. Depending on the hostname settings, some or all of the URL, may be dynamically determined.
+When a proxy is forwarding http or reencrypted TLS requests, the `proxy-headers` option should be set. Depending on the hostname settings, some or all of the URL, may be dynamically determined.
 
 WARNING: If either `forwarded` or `xforwarded` is selected, make sure your reverse proxy properly sets and overwrites the `Forwarded` or `X-Forwarded-*` headers respectively. To set these headers, consult the documentation for your reverse proxy. Misconfiguration will leave {project_name} exposed to security vulnerabilities.
 

docs/guides/server/reverseproxy.adoc

@@ -18,7 +18,7 @@ Distributed environments frequently require the use of a reverse proxy. {project
 * `forwarded` enables parsing of the `Forwarded` header as per https://www.rfc-editor.org/rfc/rfc7239.html[RFC7239].
 * `xforwarded` enables parsing of non-standard `X-Forwarded-*` headers, such as `X-Forwarded-For`, `X-Forwarded-Proto`, `X-Forwarded-Host`, and `X-Forwarded-Port`.
 
-NOTE: If you are using a reverse proxy and do not set the `proxy-headers` option, then by default you will see 403 Forbidden responses to requests via the proxy that perform origin checking.
+NOTE: If you are using a reverse proxy for anything other than https passthrough and do not set the `proxy-headers` option, then by default you will see 403 Forbidden responses to requests via the proxy that perform origin checking.
 
 For example:
 

quarkus/runtime/src/main/java/org/keycloak/quarkus/runtime/cli/command/AbstractStartCommand.java

@@ -23,7 +23,9 @@
 import org.keycloak.quarkus.runtime.Messages;
 import org.keycloak.quarkus.runtime.cli.ExecutionExceptionHandler;
 import org.keycloak.quarkus.runtime.configuration.ConfigArgsConfigSource;
+import org.keycloak.quarkus.runtime.configuration.mappers.HostnameV2PropertyMappers;
 import org.keycloak.quarkus.runtime.configuration.mappers.HttpPropertyMappers;
+import org.keycloak.url.HostnameV2ProviderFactory;
 
 import java.util.EnumSet;
 import java.util.List;
@@ -44,6 +46,7 @@ public void run() {
         doBeforeRun();
         CommandLine cmd = spec.commandLine();
         HttpPropertyMappers.validateConfig();
+        HostnameV2PropertyMappers.validateConfig();
         validateConfig();
 
         if (ConfigArgsConfigSource.getAllCliArgs().contains(OPTIMIZED_BUILD_OPTION_LONG) && !wasBuildEverRun()) {

quarkus/runtime/src/main/java/org/keycloak/quarkus/runtime/configuration/mappers/HostnameV2PropertyMappers.java

@@ -1,13 +1,20 @@
 package org.keycloak.quarkus.runtime.configuration.mappers;
 
-import org.keycloak.common.Profile;
-import org.keycloak.config.HostnameV2Options;
+import static org.keycloak.quarkus.runtime.configuration.mappers.PropertyMapper.fromOption;
 
+import java.util.Arrays;
+import java.util.List;
 import java.util.stream.Stream;
 
-import static org.keycloak.quarkus.runtime.configuration.mappers.PropertyMapper.fromOption;
+import org.jboss.logging.Logger;
+import org.keycloak.common.Profile;
+import org.keycloak.config.HostnameV2Options;
+import org.keycloak.quarkus.runtime.configuration.Configuration;
 
-final class HostnameV2PropertyMappers {
+public final class HostnameV2PropertyMappers {
+
+    private static final Logger LOGGER = Logger.getLogger(PropertyMappers.class);
+    private static final List<String> REMOVED_OPTIONS = Arrays.asList("hostname-admin-url", "hostname-path", "hostname-port", "hostname-strict-backchannel", "hostname-url", "proxy", "hostname-strict-https");
 
     private HostnameV2PropertyMappers(){}
 
@@ -28,5 +35,13 @@ public static PropertyMapper<?>[] getHostnamePropertyMappers() {
         .map(b -> b.isEnabled(() -> Profile.isFeatureEnabled(Profile.Feature.HOSTNAME_V2), "hostname:v2 feature is enabled").build())
         .toArray(s -> new PropertyMapper<?>[s]);
     }
+
+    public static void validateConfig() {
+        List<String> inUse = REMOVED_OPTIONS.stream().filter(s -> Configuration.getOptionalKcValue(s).isPresent()).toList();
+
+        if (!inUse.isEmpty()) {
+            LOGGER.errorf("Hostname v1 options %s are still in use, please review your configuration", inUse);
+        }
+    }
 
 }

services/src/main/java/org/keycloak/protocol/oidc/endpoints/LoginStatusIframeEndpoint.java

@@ -68,7 +68,7 @@ public Response preCheck(@QueryParam("client_id") String clientId, @QueryParam("
                 if (validWebOrigins.contains("*") || validWebOrigins.contains(origin)) {
                     return Response.noContent().build();
                 }
-                logger.debugf("client %s does not allow origin=%s for requestOrigin=%s (as determined by hostname settings), init will return a 403", clientId, origin, requestOrigin);
+                logger.debugf("client %s does not allow origin=%s for requestOrigin=%s (as determined by the proxy-header setting), init will return a 403", clientId, origin, requestOrigin);
             } else {
                 logger.debugf("client %s does not exist or not enabled, init will return a 403", clientId);
             }

services/src/main/java/org/keycloak/url/HostnameV2ProviderFactory.java

@@ -21,6 +21,7 @@
 import java.util.Arrays;
 import java.util.Optional;
 
+import org.jboss.logging.Logger;
 import org.keycloak.Config;
 import org.keycloak.common.Profile;
 import org.keycloak.models.KeycloakSession;
@@ -32,6 +33,9 @@
  * @author Vaclav Muzikar <vmuzikar@redhat.com>
  */
 public class HostnameV2ProviderFactory implements HostnameProviderFactory, EnvironmentDependentProviderFactory {
+
+    private static final Logger LOGGER = Logger.getLogger(HostnameV2ProviderFactory.class);
+
     private static final String INVALID_HOSTNAME = "Provided hostname is neither a plain hostname nor a valid URL";
     private String hostname;
     private URI hostnameUrl;
@@ -41,14 +45,15 @@ public class HostnameV2ProviderFactory implements HostnameProviderFactory, Envir
     @Override
     public void init(Config.Scope config) {
         // Strict mode is used just for enforcing that hostname is set
-        Boolean strictMode = config.getBoolean("hostname-strict", false);
+        boolean strictMode = config.getBoolean("hostname-strict", false);
 
         String hostnameRaw = config.get("hostname");
         if (strictMode && hostnameRaw == null) {
             throw new IllegalArgumentException("hostname is not configured; either configure hostname, or set hostname-strict to false");
         } else if (hostnameRaw != null && !strictMode) {
             // We might not need this validation as it doesn't matter in this case if strict is true or false. It's just for consistency – hostname XOR !strict.
 //            throw new IllegalArgumentException("hostname is configured, hostname-strict must be set to true");
+            LOGGER.info("If hostanme is specified, hostname-strict is effectively ignored");
         }
 
         // Set hostname, can be either a full URL, or just hostname