implemented locking-user-on-login-fail, needs to be tested

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.oidc.api/src/main/java/de/srsoftware/oidc/api/UserService.java

@@ -1,13 +1,17 @@
 /* © SRSoftware 2024 */
 package de.srsoftware.oidc.api;
 
+import static java.util.Optional.empty;
+
 import de.srsoftware.oidc.api.data.AccessToken;
+import de.srsoftware.oidc.api.data.FailedLogin;
 import de.srsoftware.oidc.api.data.User;
-import java.util.List;
+import java.time.Instant;
-import java.util.Optional;
+import java.util.*;
-import java.util.Set;
 
 public interface UserService {
+	Map<String, FailedLogin> failedLogins = new HashMap<>();
+
 	/**
 	 * create a new access token for a given user
 	 * @param user
@@ -26,9 +30,26 @@ public interface UserService {
 	public UserService	     init(User defaultUser);
 	public List<User>	     list();
 	public Set<User>	     find(String idOrEmail);
+	public default Optional<FailedLogin> getLock(String id) {
+		var failedLogin = failedLogins.get(id);
+		if (failedLogin == null || failedLogin.releaseTime().isBefore(Instant.now())) return empty();
+		return Optional.of(failedLogin);
+	}
 	public Optional<User>      load(String id);
-	public Optional<User> load(String username, String password);
+	public Optional<User>      login(String username, String password);
+	public default UserService lock(String id) {
+		var failedLogin = failedLogins.get(id);
+		if (failedLogin == null) {
+			failedLogins.put(id, failedLogin = new FailedLogin(id));
+		}
+
+		return this;
+	}
 	public boolean	           passwordMatches(String plaintextPassword, User user);
 	public UserService         save(User user);
+	public default UserService unlock(String id) {
+		failedLogins.remove(id);
+		return this;
+	}
 	public UserService updatePassword(User user, String plaintextPassword);
 }

de.srsoftware.oidc.api/src/main/java/de/srsoftware/oidc/api/data/FailedLogin.java

@@ -0,0 +1,32 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.oidc.api.data;
+
+import java.time.Instant;
+
+public class FailedLogin {
+	private final String userId;
+	private int	     attempts;
+	private Instant	     releaseTime;
+
+	public FailedLogin(String userId) {
+		this.userId   = userId;
+		this.attempts = 0;
+		count();
+	}
+
+	public void count() {
+		attempts++;
+		if (attempts > 13) attempts = 13;
+		var seconds = 1;
+		for (long i = 0; i < attempts; i++) seconds *= 2;
+		releaseTime = Instant.now().plusSeconds(seconds);
+	}
+
+	public int attempts() {
+		return attempts;
+	}
+
+	public Instant releaseTime() {
+		return releaseTime;
+	}
+}

de.srsoftware.oidc.app/src/main/java/de/srsoftware/oidc/app/Application.java

@@ -74,7 +74,7 @@ public class Application {
 		HttpServer	  server	    = HttpServer.create(new InetSocketAddress(8080), 0);
 		var	  staticPages	    = (StaticPages) new StaticPages(basePath).bindPath(STATIC_PATH, FAVICON).on(server);
 		new Forward(INDEX).bindPath(ROOT).on(server);
-		new WellKnownController().bindPath(WELL_KNOWN).on(server);
+		new WellKnownController().bindPath(WELL_KNOWN, "/realms/oidc" + WELL_KNOWN).on(server);
 		new UserController(mailConfig, sessionService, userService, staticPages).bindPath(API_USER).on(server);
 		var tokenControllerConfig = new TokenController.Configuration("https://lightoidc.srsoftware.de", 10);  // TODO configure or derive from hostname
 		new TokenController(authService, clientService, keyManager, userService, tokenControllerConfig).bindPath(API_TOKEN).on(server);

de.srsoftware.oidc.backend/src/main/java/de/srsoftware/oidc/backend/UserController.java

@@ -195,7 +195,7 @@ public class UserController extends Controller {
 		var password = body.has(PASSWORD) ? body.getString(PASSWORD) : null;
 		var trust    = body.has(TRUST) ? body.getBoolean(TRUST) : false;
 
-		Optional<User> user = users.load(username, password);
+		Optional<User> user = users.login(username, password);
 		if (user.isPresent()) return sendUserAndCookie(ex, sessions.createSession(user.get(), trust), user.get());
 		return sendEmptyResponse(HTTP_UNAUTHORIZED, ex);
 	}

de.srsoftware.oidc.backend/src/main/java/de/srsoftware/oidc/backend/WellKnownController.java

@@ -5,6 +5,7 @@ package de.srsoftware.oidc.backend;
 import com.sun.net.httpserver.HttpExchange;
 import de.srsoftware.http.PathHandler;
 import java.io.IOException;
+import java.util.List;
 import java.util.Map;
 
 public class WellKnownController extends PathHandler {
@@ -19,6 +20,12 @@ public class WellKnownController extends PathHandler {
 
 	private boolean openidConfig(HttpExchange ex) throws IOException {
 		var host = hostname(ex);
-		return sendContent(ex, Map.of("token_endpoint", host + "/api/token", "authorization_endpoint", host + "/web/authorization.html", "userinfo_endpoint", host + "/api/user/info", "jwks_uri", host + "/api/jwks.json", "issuer", "https://lightoidc.srsoftware.de"));
+		return sendContent(ex, Map.of("token_endpoint", host + "/api/token",	           //
+			              "authorization_endpoint", host + "/web/authorization.html",  //
+			              "userinfo_endpoint", host + "/api/user/info",	           //
+			              "jwks_uri", host + "/api/jwks.json",	           //
+			              "issuer", "https://lightoidc.srsoftware.de",	           //
+			              "id_token_signing_alg_values_supported", List.of("RS256"),   //
+			              "subject_types_supported", List.of("public", "pairwise")));
 	}
 }

de.srsoftware.oidc.datastore.encrypted/src/main/java/de/srsoftware/oidc/datastore/encrypted/EncryptedUserService.java

@@ -1,18 +1,17 @@
 /* © SRSoftware 2024 */
 package de.srsoftware.oidc.datastore.encrypted;
 
+import static java.lang.System.Logger.Level.WARNING;
 import static java.util.Optional.empty;
 
 import de.srsoftware.oidc.api.UserService;
 import de.srsoftware.oidc.api.data.AccessToken;
 import de.srsoftware.oidc.api.data.User;
 import de.srsoftware.utils.PasswordHasher;
-import java.util.HashMap;
+import java.util.*;
-import java.util.List;
-import java.util.Optional;
-import java.util.Set;
 
 public class EncryptedUserService extends EncryptedConfig implements UserService {
+	private static final System.Logger LOG = System.getLogger(EncryptedUserService.class.getSimpleName());
 	private final UserService	   backend;
 	private final PasswordHasher	   hasher;
 
@@ -94,12 +93,23 @@ public class EncryptedUserService extends EncryptedConfig implements UserService
 	}
 
 	@Override
-	public Optional<User> load(String username, String password) {
+	public Optional<User> login(String username, String password) {
 		if (username == null || username.isBlank()) return empty();
+		var optLock = getLock(username);
+		if (optLock.isPresent()) {
+			var lock = optLock.get();
+			LOG.log(WARNING, "{} is locked after {} failed logins. Lock will be released at {}", username, lock.attempts(), lock.releaseTime());
+			return empty();
+		}
 		for (var encryptedUser : backend.list()) {
 			var decryptedUser = decrypt(encryptedUser);
-			if (username.equals(decryptedUser.username()) && hasher.matches(password, decryptedUser.hashedPassword())) return Optional.of(decryptedUser);
+			if (!username.equals(decryptedUser.username())) continue;
+			if (hasher.matches(password, decryptedUser.hashedPassword())) {
+				this.unlock(username);
+				return Optional.of(decryptedUser);
+			}
 		}
+		lock(username);
 		return empty();
 	}
 

de.srsoftware.oidc.datastore.encrypted/src/test/java/EncryptedUserServiceTest.java

@@ -1,6 +1,7 @@
 /* © SRSoftware 2024 */
 import static de.srsoftware.utils.Optionals.nullable;
 import static de.srsoftware.utils.Strings.uuid;
+import static java.lang.System.Logger.Level.WARNING;
 
 import de.srsoftware.oidc.api.UserService;
 import de.srsoftware.oidc.api.UserServiceTest;
@@ -15,6 +16,7 @@ import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 
 public class EncryptedUserServiceTest extends UserServiceTest {
+	private static final System.Logger           LOG = System.getLogger(EncryptedUserServiceTest.class.getSimpleName());
 	private class InMemoryUserService implements UserService {
 		private final PasswordHasher<String> hasher;
 		private HashMap<String, User>	     users = new HashMap<>();
@@ -66,8 +68,23 @@ public class EncryptedUserServiceTest extends UserServiceTest {
 		}
 
 		@Override
-		public Optional<User> load(String username, String password) {
+		public Optional<User> login(String username, String password) {
-			return users.values().stream().filter(user -> user.username().equals(username) && passwordMatches(password, user)).findAny();
+			var optLock = getLock(username);
+			if (optLock.isPresent()) {
+				var lock = optLock.get();
+				LOG.log(WARNING, "{} is locked after {} failed logins. Lock will be released at {}", username, lock.attempts(), lock.releaseTime());
+				return Optional.empty();
+			}
+
+			for (var entry : users.entrySet()) {
+				var user = entry.getValue();
+				if (user.username().equals(username) && passwordMatches(password, user)) {
+					unlock(username);
+					return Optional.of(user);
+				}
+			}
+			lock(username);
+			return Optional.empty();
 		}
 
 		@Override

de.srsoftware.oidc.datastore.file/src/main/java/de/srsoftware/oidc/datastore/file/FileStore.java

@@ -140,6 +140,7 @@ public class FileStore implements AuthorizationService, ClientService, SessionSe
 		return this;
 	}
 
+
 	@Override
 	public Set<User> find(String key) {
 		if (!json.has(USERS)) return Set.of();
@@ -175,8 +176,14 @@ public class FileStore implements AuthorizationService, ClientService, SessionSe
 	}
 
 	@Override
-	public Optional<User> load(String user, String password) {
+	public Optional<User> login(String user, String password) {
 		if (!json.has(USERS)) return empty();
+		var optLock = getLock(user);
+		if (optLock.isPresent()) {
+			var lock = optLock.get();
+			LOG.log(WARNING, "{} is locked after {} failed logins. Lock will be released at {}", user, lock.attempts(), lock.releaseTime());
+			return empty();
+		}
 		try {
 			var users = json.getJSONObject(USERS);
 			for (String userId : users.keySet()) {
@@ -184,8 +191,13 @@ public class FileStore implements AuthorizationService, ClientService, SessionSe
 
 				if (KEYS.stream().map(userData::getString).noneMatch(val -> val.equals(user))) continue;
 				var loadedUser = User.of(userData, userId).filter(u -> passwordMatches(password, u));
-				if (loadedUser.isPresent()) return loadedUser;
+				if (loadedUser.isPresent()) {
+					unlock(user);
+					return loadedUser;
 				}
+				lock(userId);
+			}
+			lock(user);
 			return empty();
 		} catch (Exception e) {
 			return empty();
@@ -210,6 +222,7 @@ public class FileStore implements AuthorizationService, ClientService, SessionSe
 		return save();
 	}
 
+
 	@Override
 	public FileStore updatePassword(User user, String plaintextPassword) {
 		return save(user.hashedPassword(passwordHasher.hash(plaintextPassword, uuid())));