Add local authentication option (#37)

Co-authored-by: Shaun Campbell <shaun@campbellwireless.net>
Reviewed-on: #37
Co-authored-by: AI Agent <ai-agent@campbellwireless.net>
Co-committed-by: AI Agent <ai-agent@campbellwireless.net>

.env.example

@@ -10,6 +10,15 @@ AUTH_URL=https://cloud.campbellwireless.net/trips/auth
 # Auth.js secret — generate with: openssl rand -base64 32
 AUTH_SECRET=
 
+# Local auth
+LOCAL_AUTH_ENABLED=false
+LOCAL_AUTH_ARGON2_MEMORY_KB=65536
+LOCAL_AUTH_ARGON2_TIME_COST=3
+LOCAL_AUTH_ARGON2_PARALLELISM=1
+LOCAL_AUTH_MAX_ATTEMPTS=5
+LOCAL_AUTH_WINDOW_SECONDS=900
+LOCAL_AUTH_LOCKOUT_SECONDS=900
+
 # Admin — comma-separated user IDs (from auth provider) that can access /admin
 ADMIN_USER_IDS=
 

README.md

@@ -43,6 +43,19 @@ bun install
 bun run dev
 ```
 
+## Local authentication
+
+Local auth is optional and off by default. Enable it with the env vars in `.env.example` and ensure users have a matching row in both `users` and `local_credentials`.
+
+To seed a local password hash, use Argon2id with the configured parameters and insert it into `local_credentials`:
+
+```sql
+INSERT INTO local_credentials (user_id, password_hash)
+VALUES ('<user-id>', '<argon2id hash>');
+```
+
+Passwords must be at least 12 characters. Avoid storing plaintext passwords anywhere.
+
 ## Quality and Tests
 
 ```sh

bun.lock

@@ -6,6 +6,7 @@
       "name": "trips",
       "dependencies": {
         "@auth/sveltekit": "^1.11.1",
+        "argon2": "^0.41.1",
       },
       "devDependencies": {
         "@biomejs/biome": "^2.4.4",
@@ -153,6 +154,8 @@
 
     "@panva/hkdf": ["@panva/hkdf@1.2.1", "", {}, "sha512-6oclG6Y3PiDFcoyk8srjLfVKyMfVCKJ27JwNPViuXziFpmdz+MZnZN/aKY0JGXgYuO/VghU0jcOAZgWXZ1Dmrw=="],
 
+    "@phc/format": ["@phc/format@1.0.0", "", {}, "sha512-m7X9U6BG2+J+R1lSOdCiITLLrxm+cWlNI3HUFA92oLO77ObGNzaKdh8pMLqdZcshtkKuV84olNNXDfMc4FezBQ=="],
+
     "@polka/url": ["@polka/url@1.0.0-next.29", "", {}, "sha512-wwQAWhWSuHaag8c4q/KN/vCoeOJYshAIvMQwD4GpSb3OiZklFfvAgmj0VCBBImRpuF/aFgIRzllXlVX93Jevww=="],
 
     "@rollup/plugin-commonjs": ["@rollup/plugin-commonjs@29.0.0", "", { "dependencies": { "@rollup/pluginutils": "^5.0.1", "commondir": "^1.0.1", "estree-walker": "^2.0.2", "fdir": "^6.2.0", "is-reference": "1.2.1", "magic-string": "^0.30.3", "picomatch": "^4.0.2" }, "peerDependencies": { "rollup": "^2.68.0||^3.0.0||^4.0.0" }, "optionalPeers": ["rollup"] }, "sha512-U2YHaxR2cU/yAiwKJtJRhnyLk7cifnQw0zUpISsocBDoHDJn+HTV74ABqnwr5bEgWUwFZC9oFL6wLe21lHu5eQ=="],
@@ -315,6 +318,8 @@
 
     "ajv": ["ajv@6.12.6", "", { "dependencies": { "fast-deep-equal": "^3.1.1", "fast-json-stable-stringify": "^2.0.0", "json-schema-traverse": "^0.4.1", "uri-js": "^4.2.2" } }, "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g=="],
 
+    "argon2": ["argon2@0.41.1", "", { "dependencies": { "@phc/format": "^1.0.0", "node-addon-api": "^8.1.0", "node-gyp-build": "^4.8.1" } }, "sha512-dqCW8kJXke8Ik+McUcMDltrbuAWETPyU6iq+4AhxqKphWi7pChB/Zgd/Tp/o8xRLbg8ksMj46F/vph9wnxpTzQ=="],
+
     "aria-query": ["aria-query@5.3.2", "", {}, "sha512-COROpnaoap1E2F000S62r6A60uHZnmlvomhfyT2DlTcrY1OrBKn2UhH7qn5wTC9zMvD0AY7csdPSNwKP+7WiQw=="],
 
     "assertion-error": ["assertion-error@2.0.1", "", {}, "sha512-Izi8RQcffqCeNVgFigKli1ssklIbpHnCYc6AknXGYoB6grJqyeby7jv12JUQgmTAnIDnbck1uxksT4dzN3PWBA=="],
@@ -509,6 +514,10 @@
 
     "natural-compare": ["natural-compare@1.4.0", "", {}, "sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw=="],
 
+    "node-addon-api": ["node-addon-api@8.5.0", "", {}, "sha512-/bRZty2mXUIFY/xU5HLvveNHlswNJej+RnxBjOMkidWfwZzgTbPG1E3K5TOxRLOR+5hX7bSofy8yf1hZevMS8A=="],
+
+    "node-gyp-build": ["node-gyp-build@4.8.4", "", { "bin": { "node-gyp-build": "bin.js", "node-gyp-build-optional": "optional.js", "node-gyp-build-test": "build-test.js" } }, "sha512-LA4ZjwlnUblHVgq0oBF3Jl/6h/Nvs5fzBLwdEF4nuxnFdsfajde4WfxtJr3CaiH+F6ewcIB/q4jQ4UzPyid+CQ=="],
+
     "oauth4webapi": ["oauth4webapi@3.8.5", "", {}, "sha512-A8jmyUckVhRJj5lspguklcl90Ydqk61H3dcU0oLhH3Yv13KpAliKTt5hknpGGPZSSfOwGyraNEFmofDYH+1kSg=="],
 
     "obug": ["obug@2.1.1", "", {}, "sha512-uTqF9MuPraAQ+IsnPf366RG4cP9RtUi7MLO1N3KEc+wb0a6yKpeL0lmk2IB1jY5KHPAlTc6T/JRdC/YqxHNwkQ=="],

package.json

@@ -40,6 +40,7 @@
 		"vitest": "^4.0.18"
 	},
 	"dependencies": {
-		"@auth/sveltekit": "^1.11.1"
+		"@auth/sveltekit": "^1.11.1",
+		"argon2": "^0.41.1"
 	}
 }

src/auth.ts

@@ -1,6 +1,8 @@
 import { SvelteKitAuth } from '@auth/sveltekit';
+import Credentials from '@auth/core/providers/credentials';
 import { env } from '$env/dynamic/private';
 import { upsertUserFromAuth } from '$lib/server/users.js';
+import { verifyLocalCredentials } from '$lib/server/local-auth.js';
 
 export const { handle, signIn, signOut } = SvelteKitAuth({
 	providers: [
@@ -19,11 +21,34 @@ export const { handle, signIn, signOut } = SvelteKitAuth({
 					email: profile.email as string | undefined
 				};
 			}
+		},
+		Credentials({
+			id: 'local',
+			name: 'Local',
+			credentials: {
+				identifier: { label: 'Username or email', type: 'text' },
+				password: { label: 'Password', type: 'password' }
+			},
+			async authorize(credentials, request) {
+				const identifier = String(credentials?.identifier ?? '').trim();
+				const password = String(credentials?.password ?? '').trim();
+				const ip =
+					request?.headers?.get?.('x-forwarded-for') ??
+					request?.headers?.get?.('x-real-ip') ??
+					undefined;
+				const result = await verifyLocalCredentials(identifier, password, ip);
+				if (result.status !== 'success') return null;
+				return {
+					id: result.user.id,
+					name: result.user.name,
+					email: result.user.email ?? undefined
+				};
 			}
+		})
 	],
 	trustHost: true,
 	callbacks: {
-		jwt({ token, profile }) {
+		jwt({ token, profile, user }) {
 			const details = profile as
 				| {
 						sub?: string;
@@ -43,6 +68,9 @@ export const { handle, signIn, signOut } = SvelteKitAuth({
 					authSource: 'OIDC - Synology'
 				});
 			}
+			if (user?.id) {
+				token.sub = user.id as string;
+			}
 			return token;
 		},
 		session({ session, token }) {

src/lib/server/admin/auth.test.ts

@@ -0,0 +1,81 @@
+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+import { setupTestDb } from '../../../tests/helpers.js';
+import type { Database } from '../db/types.js';
+import { upsertUserFromAuth } from '../users.js';
+import { isAdminUser, requireAdmin } from './auth.js';
+
+let database: Database;
+const originalAdminUserIds = process.env.ADMIN_USER_IDS;
+
+beforeEach(() => {
+	database = setupTestDb();
+	process.env.ADMIN_USER_IDS = '';
+});
+
+afterEach(() => {
+	process.env.ADMIN_USER_IDS = originalAdminUserIds;
+	database.close();
+});
+
+describe('isAdminUser', () => {
+	it('allows direct ID matches', () => {
+		process.env.ADMIN_USER_IDS = 'oidc-sub-123';
+		expect(isAdminUser('oidc-sub-123')).toBe(true);
+	});
+
+	it('allows username matches for known users', () => {
+		upsertUserFromAuth({
+			id: 'oidc-sub-123',
+			username: 'shaun',
+			fullName: 'Shaun Campbell',
+			email: 'shaun@example.com'
+		});
+		process.env.ADMIN_USER_IDS = 'shaun';
+		expect(isAdminUser('oidc-sub-123')).toBe(true);
+	});
+
+	it('allows email matches for known users', () => {
+		upsertUserFromAuth({
+			id: 'oidc-sub-123',
+			username: 'shaun',
+			fullName: 'Shaun Campbell',
+			email: 'shaun@example.com'
+		});
+		process.env.ADMIN_USER_IDS = 'shaun@example.com';
+		expect(isAdminUser('oidc-sub-123')).toBe(true);
+	});
+
+	it('allows email local-part matches from session user', () => {
+		process.env.ADMIN_USER_IDS = 'shaun';
+		expect(isAdminUser({ id: 'oidc-sub-123', email: 'shaun@example.com' })).toBe(true);
+	});
+});
+
+describe('requireAdmin', () => {
+	it('throws when not authenticated', () => {
+		process.env.ADMIN_USER_IDS = 'shaun';
+		expect(() => requireAdmin(undefined)).toThrow('Not authenticated');
+	});
+
+	it('throws when user is not admin', () => {
+		process.env.ADMIN_USER_IDS = 'shaun';
+		expect(() => requireAdmin('someone-else')).toThrow('Admin access required');
+	});
+
+	it('does not throw when username match grants admin access', () => {
+		upsertUserFromAuth({
+			id: 'oidc-sub-123',
+			username: 'shaun',
+			fullName: 'Shaun Campbell'
+		});
+		process.env.ADMIN_USER_IDS = 'shaun';
+		expect(() => requireAdmin('oidc-sub-123')).not.toThrow();
+	});
+
+	it('does not throw when session user email local-part matches', () => {
+		process.env.ADMIN_USER_IDS = 'shaun';
+		expect(() =>
+			requireAdmin({ id: 'oidc-sub-123', email: 'shaun@example.com', name: 'Shaun Campbell' })
+		).not.toThrow();
+	});
+});

src/lib/server/admin/auth.ts

@@ -1,12 +1,73 @@
 import { env } from '$env/dynamic/private';
+import { db } from '$lib/server/db/index.js';
 
-export function requireAdmin(userId: string | undefined): void {
+const getAdminIdentifiers = (): string[] =>
-	if (!userId) throw new Error('Not authenticated');
+	(process.env.ADMIN_USER_IDS ?? env.ADMIN_USER_IDS ?? '')
-	const adminIds = (env.ADMIN_USER_IDS ?? '')
 		.split(',')
 		.map((s) => s.trim())
 		.filter(Boolean);
-	if (adminIds.length === 0 || !adminIds.includes(userId)) {
+
+type AdminPrincipal =
+	| string
+	| {
+			id?: string | null;
+			name?: string | null;
+			email?: string | null;
+	  }
+	| undefined;
+
+const normalize = (value: string): string => value.trim().toLowerCase();
+
+const getPrincipalValues = (principal: AdminPrincipal): { userId?: string; values: string[] } => {
+	if (!principal) return { values: [] };
+	if (typeof principal === 'string') {
+		const value = principal.trim();
+		return value ? { userId: value, values: [value] } : { values: [] };
+	}
+
+	const values = [principal.id, principal.name, principal.email]
+		.filter((value): value is string => Boolean(value?.trim()))
+		.map((value) => value.trim());
+	const localPart = principal.email?.split('@')[0]?.trim();
+	if (localPart) values.push(localPart);
+
+	const userId = principal.id?.trim();
+	return { userId, values };
+};
+
+export function isAdminUser(principal: AdminPrincipal): boolean {
+	const { userId, values } = getPrincipalValues(principal);
+	if (values.length === 0) return false;
+
+	const adminIds = getAdminIdentifiers();
+	if (adminIds.length === 0) return false;
+
+	const normalizedAdminIds = new Set(adminIds.map(normalize));
+	for (const value of values) {
+		if (adminIds.includes(value) || normalizedAdminIds.has(normalize(value))) return true;
+	}
+
+	if (!userId) return false;
+
+	const user = db.get<{ username: string; email: string | null }>(
+		'SELECT username, email FROM users WHERE id = ?',
+		[userId]
+	);
+	if (!user) return false;
+
+	const dbValues = [user.username, user.email, user.email?.split('@')[0]]
+		.filter((value): value is string => Boolean(value?.trim()))
+		.map((value) => value.trim());
+	for (const value of dbValues) {
+		if (adminIds.includes(value) || normalizedAdminIds.has(normalize(value))) return true;
+	}
+
+	return false;
+}
+
+export function requireAdmin(principal: AdminPrincipal): void {
+	if (!principal) throw new Error('Not authenticated');
+	if (!isAdminUser(principal)) {
 		throw new Error('Admin access required');
 	}
 }

src/lib/server/db/migrations.ts

@@ -65,6 +65,15 @@ export function runMigrations(db: Database): void {
 		)
 	`);
 
+	db.run(`
+		CREATE TABLE IF NOT EXISTS local_credentials (
+			user_id       TEXT PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+			password_hash TEXT NOT NULL,
+			created_at    TEXT NOT NULL DEFAULT (datetime('now')),
+			updated_at    TEXT NOT NULL DEFAULT (datetime('now'))
+		)
+	`);
+
 	db.run(`
 		CREATE TABLE IF NOT EXISTS cities (
 			id           INTEGER PRIMARY KEY,

src/lib/server/local-auth.test.ts

@@ -0,0 +1,84 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { setupTestDb } from '../../tests/helpers.js';
+import type { Database } from './db/types.js';
+import { setLocalCredentialPassword } from './local-credentials.js';
+import { resetLocalAuthRateLimits, verifyLocalCredentials } from './local-auth.js';
+import { upsertUserFromAuth } from './users.js';
+
+let database: Database;
+
+beforeEach(() => {
+	process.env.LOCAL_AUTH_ENABLED = 'true';
+	process.env.LOCAL_AUTH_ARGON2_MEMORY_KB = '8192';
+	process.env.LOCAL_AUTH_ARGON2_TIME_COST = '2';
+	process.env.LOCAL_AUTH_ARGON2_PARALLELISM = '1';
+	process.env.LOCAL_AUTH_MAX_ATTEMPTS = '2';
+	process.env.LOCAL_AUTH_WINDOW_SECONDS = '60';
+	process.env.LOCAL_AUTH_LOCKOUT_SECONDS = '10';
+	database = setupTestDb();
+	resetLocalAuthRateLimits();
+});
+
+afterEach(() => {
+	vi.useRealTimers();
+	resetLocalAuthRateLimits();
+	database.close();
+});
+
+describe('verifyLocalCredentials', () => {
+	it('authenticates valid local credentials', async () => {
+		upsertUserFromAuth({
+			id: 'user-1',
+			username: 'jdoe',
+			fullName: 'Jane Doe',
+			email: 'jane@example.com',
+			authSource: 'Local'
+		});
+		await setLocalCredentialPassword('user-1', 'averysecurepassword');
+
+		const result = await verifyLocalCredentials('jdoe', 'averysecurepassword', '127.0.0.1');
+
+		expect(result.status).toBe('success');
+		if (result.status === 'success') {
+			expect(result.user.id).toBe('user-1');
+			expect(result.user.email).toBe('jane@example.com');
+		}
+	});
+
+	it('returns invalid for bad credentials and locks after max attempts', async () => {
+		upsertUserFromAuth({ id: 'user-2', username: 'sally', fullName: 'Sally Sample' });
+		await setLocalCredentialPassword('user-2', 'averysecurepassword');
+
+		const first = await verifyLocalCredentials('sally', 'wrong-password', '10.0.0.1');
+		const second = await verifyLocalCredentials('sally', 'wrong-password', '10.0.0.1');
+		const third = await verifyLocalCredentials('sally', 'wrong-password', '10.0.0.1');
+
+		expect(first.status).toBe('invalid');
+		expect(second.status).toBe('invalid');
+		expect(third.status).toBe('locked');
+	});
+
+	it('clears lockout after window expires', async () => {
+		upsertUserFromAuth({ id: 'user-3', username: 'morgan', fullName: 'Morgan West' });
+		await setLocalCredentialPassword('user-3', 'averysecurepassword');
+		vi.useFakeTimers();
+		vi.setSystemTime(new Date('2024-01-01T00:00:00Z'));
+
+		await verifyLocalCredentials('morgan', 'wrong-password', '10.0.0.2');
+		await verifyLocalCredentials('morgan', 'wrong-password', '10.0.0.2');
+		const locked = await verifyLocalCredentials('morgan', 'averysecurepassword', '10.0.0.2');
+
+		expect(locked.status).toBe('locked');
+
+		vi.advanceTimersByTime(11_000);
+		const after = await verifyLocalCredentials('morgan', 'averysecurepassword', '10.0.0.2');
+
+		expect(after.status).toBe('success');
+	});
+
+	it('rejects when local auth is disabled', async () => {
+		process.env.LOCAL_AUTH_ENABLED = 'false';
+		const result = await verifyLocalCredentials('anyone', 'password', '10.0.0.3');
+		expect(result.status).toBe('disabled');
+	});
+});

src/lib/server/local-auth.ts

@@ -0,0 +1,154 @@
+import { env } from '$env/dynamic/private';
+import argon2 from 'argon2';
+import { getLocalCredentialByIdentifier, hashLocalPassword } from './local-credentials.js';
+
+export interface LocalAuthUser {
+	id: string;
+	name: string;
+	email?: string | null;
+}
+
+export type LocalAuthResult =
+	| { status: 'success'; user: LocalAuthUser }
+	| { status: 'invalid' | 'locked' | 'disabled' };
+
+interface AttemptState {
+	count: number;
+	firstAttemptAt: number;
+	lockedUntil?: number;
+}
+
+const attemptsByIdentifier = new Map<string, AttemptState>();
+const attemptsByIp = new Map<string, AttemptState>();
+let dummyHashPromise: Promise<string> | null = null;
+
+const getEnvValue = (key: keyof typeof env): string | undefined => {
+	return process.env[key] ?? env[key];
+};
+
+const getNumberEnv = (value: string | undefined, fallback: number): number => {
+	const parsed = Number.parseInt(value ?? '', 10);
+	return Number.isFinite(parsed) ? parsed : fallback;
+};
+
+const getLocalAuthConfig = () => {
+	return {
+		enabled: getEnvValue('LOCAL_AUTH_ENABLED') === 'true',
+		maxAttempts: getNumberEnv(getEnvValue('LOCAL_AUTH_MAX_ATTEMPTS'), 5),
+		windowMs: getNumberEnv(getEnvValue('LOCAL_AUTH_WINDOW_SECONDS'), 900) * 1000,
+		lockoutMs: getNumberEnv(getEnvValue('LOCAL_AUTH_LOCKOUT_SECONDS'), 900) * 1000
+	};
+};
+
+const normalizeIdentifier = (value: string): string => value.trim().toLowerCase();
+const normalizePassword = (value: string): string => value.trim();
+
+const normalizeIp = (value?: string | null): string => {
+	if (!value) return 'unknown';
+	const trimmed = value.trim();
+	if (!trimmed) return 'unknown';
+	return trimmed.split(',')[0]?.trim() || 'unknown';
+};
+
+const getDummyHash = async (): Promise<string> => {
+	if (!dummyHashPromise) {
+		dummyHashPromise = hashLocalPassword('invalid-password-placeholder');
+	}
+	return dummyHashPromise;
+};
+
+const getEffectiveState = (state: AttemptState | undefined, now: number, windowMs: number) => {
+	if (!state) return { count: 0, firstAttemptAt: now };
+	if (state.lockedUntil && state.lockedUntil <= now) {
+		return { count: 0, firstAttemptAt: now };
+	}
+	if (now - state.firstAttemptAt > windowMs) {
+		return { count: 0, firstAttemptAt: now };
+	}
+	return { ...state };
+};
+
+const isLocked = (state: AttemptState, now: number): boolean => {
+	return Boolean(state.lockedUntil && state.lockedUntil > now);
+};
+
+const recordFailure = (
+	map: Map<string, AttemptState>,
+	key: string,
+	now: number,
+	windowMs: number,
+	lockoutMs: number,
+	maxAttempts: number
+): void => {
+	const state = getEffectiveState(map.get(key), now, windowMs);
+	const nextCount = state.count + 1;
+	const nextState: AttemptState = {
+		count: nextCount,
+		firstAttemptAt: state.firstAttemptAt
+	};
+	if (nextCount >= maxAttempts) {
+		nextState.lockedUntil = now + lockoutMs;
+	}
+	map.set(key, nextState);
+};
+
+const clearAttemptState = (map: Map<string, AttemptState>, key: string): void => {
+	map.delete(key);
+};
+
+export function resetLocalAuthRateLimits(): void {
+	attemptsByIdentifier.clear();
+	attemptsByIp.clear();
+}
+
+export async function verifyLocalCredentials(
+	identifierInput: string,
+	passwordInput: string,
+	ipAddress?: string | null
+): Promise<LocalAuthResult> {
+	const config = getLocalAuthConfig();
+	if (!config.enabled) return { status: 'disabled' };
+
+	const identifier = normalizeIdentifier(identifierInput ?? '');
+	const password = normalizePassword(passwordInput ?? '');
+	const identifierKey = identifier || 'unknown';
+	const ipKey = normalizeIp(ipAddress);
+	const now = Date.now();
+
+	const identifierState = getEffectiveState(
+		attemptsByIdentifier.get(identifierKey),
+		now,
+		config.windowMs
+	);
+	const ipState = getEffectiveState(attemptsByIp.get(ipKey), now, config.windowMs);
+	const locked = isLocked(identifierState, now) || isLocked(ipState, now);
+
+	const record = identifier ? getLocalCredentialByIdentifier(identifier) : null;
+	const passwordHash = record?.passwordHash ?? (await getDummyHash());
+	const passwordMatches = await argon2.verify(passwordHash, password);
+
+	if (!locked && record && passwordMatches) {
+		clearAttemptState(attemptsByIdentifier, identifierKey);
+		clearAttemptState(attemptsByIp, ipKey);
+		return {
+			status: 'success',
+			user: {
+				id: record.userId,
+				name: record.fullName || record.username,
+				email: record.email ?? undefined
+			}
+		};
+	}
+
+	recordFailure(
+		attemptsByIdentifier,
+		identifierKey,
+		now,
+		config.windowMs,
+		config.lockoutMs,
+		config.maxAttempts
+	);
+	recordFailure(attemptsByIp, ipKey, now, config.windowMs, config.lockoutMs, config.maxAttempts);
+
+	return { status: locked ? 'locked' : 'invalid' };
+}

src/lib/server/local-credentials.ts

@@ -0,0 +1,67 @@
+import { env } from '$env/dynamic/private';
+import argon2 from 'argon2';
+import { db } from './db/index.js';
+
+export interface LocalCredentialRecord {
+	userId: string;
+	username: string;
+	fullName: string;
+	email: string | null;
+	passwordHash: string;
+}
+
+export const LOCAL_AUTH_MIN_PASSWORD_LENGTH = 12;
+
+const getNumberEnv = (value: string | undefined, fallback: number): number => {
+	const parsed = Number.parseInt(value ?? '', 10);
+	return Number.isFinite(parsed) ? parsed : fallback;
+};
+
+export function getLocalCredentialByIdentifier(identifier: string): LocalCredentialRecord | null {
+	const normalized = identifier.trim();
+	if (!normalized) return null;
+	return (
+		db.get<LocalCredentialRecord>(
+			`SELECT
+				users.id as userId,
+				users.username as username,
+				users.full_name as fullName,
+				users.email as email,
+				local_credentials.password_hash as passwordHash
+			 FROM users
+			 INNER JOIN local_credentials ON local_credentials.user_id = users.id
+			 WHERE lower(users.username) = lower(?)
+				OR (users.email IS NOT NULL AND lower(users.email) = lower(?))
+			 LIMIT 1`,
+			[normalized, normalized]
+		) ?? null
+	);
+}
+
+export async function hashLocalPassword(password: string): Promise<string> {
+	const trimmed = password.trim();
+	if (trimmed.length < LOCAL_AUTH_MIN_PASSWORD_LENGTH) {
+		throw new Error(`Password must be at least ${LOCAL_AUTH_MIN_PASSWORD_LENGTH} characters`);
+	}
+	const memoryCost = getNumberEnv(env.LOCAL_AUTH_ARGON2_MEMORY_KB, 65536);
+	const timeCost = getNumberEnv(env.LOCAL_AUTH_ARGON2_TIME_COST, 3);
+	const parallelism = getNumberEnv(env.LOCAL_AUTH_ARGON2_PARALLELISM, 1);
+	return argon2.hash(trimmed, {
+		type: argon2.argon2id,
+		memoryCost,
+		timeCost,
+		parallelism
+	});
+}
+
+export async function setLocalCredentialPassword(userId: string, password: string): Promise<void> {
+	const passwordHash = await hashLocalPassword(password);
+	db.run(
+		`INSERT INTO local_credentials (user_id, password_hash)
+		 VALUES (?, ?)
+		 ON CONFLICT(user_id) DO UPDATE SET
+			password_hash = excluded.password_hash,
+			updated_at = datetime('now')`,
+		[userId, passwordHash]
+	);
+}

src/routes/(protected)/+layout.server.ts

@@ -1,6 +1,6 @@
 import { redirect } from '@sveltejs/kit';
 import { base } from '$app/paths';
-import { env } from '$env/dynamic/private';
+import { isAdminUser } from '$lib/server/admin/auth.js';
 import type { LayoutServerLoad } from './$types';
 
 export const load: LayoutServerLoad = async (event) => {
@@ -9,11 +9,7 @@ export const load: LayoutServerLoad = async (event) => {
 		redirect(303, `${base}/login`);
 	}
 
-	const adminIds = (env.ADMIN_USER_IDS ?? '')
+	const isAdmin = isAdminUser(session.user);
-		.split(',')
-		.map((s) => s.trim())
-		.filter(Boolean);
-	const isAdmin = adminIds.length > 0 && session.user.id && adminIds.includes(session.user.id);
 
 	return { session, isAdmin };
 };

src/routes/(protected)/admin/api/airlines/+server.ts

@@ -4,13 +4,13 @@ import { requireAdmin } from '$lib/server/admin/auth.js';
 import * as data from '$lib/server/admin/data.js';
 
 export const GET: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const q = event.url.searchParams.get('q') ?? undefined;
 	return json(data.listAirlines(q));
 };
 
 export const POST: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { name, country, country_code, iata_code, icao_code } = body as {
 		name?: string;
@@ -32,7 +32,7 @@ export const POST: RequestHandler = async (event) => {
 };
 
 export const PATCH: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { id, name, country, country_code, iata_code, icao_code } = body as {
 		id?: number;
@@ -55,7 +55,7 @@ export const PATCH: RequestHandler = async (event) => {
 };
 
 export const DELETE: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const id = parseInt(event.url.searchParams.get('id') ?? '');
 	if (isNaN(id)) return json({ error: 'id required' }, { status: 400 });
 	data.deleteAirline(id);

src/routes/(protected)/admin/api/airports/+server.ts

@@ -4,13 +4,13 @@ import { requireAdmin } from '$lib/server/admin/auth.js';
 import * as data from '$lib/server/admin/data.js';
 
 export const GET: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const q = event.url.searchParams.get('q') ?? undefined;
 	return json(data.listAirports(q));
 };
 
 export const POST: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { name, country, country_code, iata_code, icao_code, city, latitude, longitude, timezone } =
 		body as {
@@ -43,7 +43,7 @@ export const POST: RequestHandler = async (event) => {
 };
 
 export const PATCH: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const {
 		id,
@@ -87,7 +87,7 @@ export const PATCH: RequestHandler = async (event) => {
 };
 
 export const DELETE: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const id = parseInt(event.url.searchParams.get('id') ?? '');
 	if (isNaN(id)) return json({ error: 'id required' }, { status: 400 });
 	data.deleteAirport(id);

src/routes/(protected)/admin/api/cities/+server.ts

@@ -4,14 +4,14 @@ import { requireAdmin } from '$lib/server/admin/auth.js';
 import * as data from '$lib/server/admin/data.js';
 
 export const GET: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const q = event.url.searchParams.get('q') ?? undefined;
 	const countryCode = event.url.searchParams.get('country_code') ?? undefined;
 	return json(data.listCities(q, countryCode));
 };
 
 export const POST: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { name, country, country_code, population } = body as {
 		name?: string;
@@ -26,7 +26,7 @@ export const POST: RequestHandler = async (event) => {
 };
 
 export const PATCH: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { id, name, country, country_code, population } = body as {
 		id?: number;
@@ -43,7 +43,7 @@ export const PATCH: RequestHandler = async (event) => {
 };
 
 export const DELETE: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const id = parseInt(event.url.searchParams.get('id') ?? '');
 	if (isNaN(id)) return json({ error: 'id required' }, { status: 400 });
 	data.deleteCity(id);

src/routes/(protected)/admin/api/countries/+server.ts

@@ -4,13 +4,13 @@ import { requireAdmin } from '$lib/server/admin/auth.js';
 import * as data from '$lib/server/admin/data.js';
 
 export const GET: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const q = event.url.searchParams.get('q') ?? undefined;
 	return json(data.listCountries(q));
 };
 
 export const POST: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { name, country_code } = body as { name?: string; country_code?: string };
 	if (!name?.trim() || !country_code?.trim()) {
@@ -20,7 +20,7 @@ export const POST: RequestHandler = async (event) => {
 };
 
 export const PATCH: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { id, name, country_code } = body as { id?: number; name?: string; country_code?: string };
 	if (id == null || !name?.trim() || !country_code?.trim()) {
@@ -31,7 +31,7 @@ export const PATCH: RequestHandler = async (event) => {
 };
 
 export const DELETE: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const id = parseInt(event.url.searchParams.get('id') ?? '');
 	if (isNaN(id)) return json({ error: 'id required' }, { status: 400 });
 	data.deleteCountry(id);

src/routes/(protected)/admin/api/operator-tour-days/+server.ts

@@ -4,14 +4,14 @@ import { requireAdmin } from '$lib/server/admin/auth.js';
 import * as data from '$lib/server/admin/data.js';
 
 export const GET: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const tourId = parseInt(event.url.searchParams.get('operator_tour_id') ?? '');
 	if (isNaN(tourId)) return json({ error: 'operator_tour_id required' }, { status: 400 });
 	return json(data.listDaysForOperatorTour(tourId));
 };
 
 export const POST: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { operator_tour_id, title, notes } = body as {
 		operator_tour_id?: number;
@@ -25,7 +25,7 @@ export const POST: RequestHandler = async (event) => {
 };
 
 export const PATCH: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { id, title, notes } = body as { id?: number; title?: string; notes?: string };
 	if (id == null) return json({ error: 'id is required' }, { status: 400 });
@@ -34,7 +34,7 @@ export const PATCH: RequestHandler = async (event) => {
 };
 
 export const DELETE: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const id = parseInt(event.url.searchParams.get('id') ?? '');
 	if (isNaN(id)) return json({ error: 'id required' }, { status: 400 });
 	data.deleteOperatorTourDay(id);

src/routes/(protected)/admin/api/operator-tours/+server.ts

@@ -4,14 +4,14 @@ import { requireAdmin } from '$lib/server/admin/auth.js';
 import * as data from '$lib/server/admin/data.js';
 
 export const GET: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const operatorId = parseInt(event.url.searchParams.get('operator_id') ?? '');
 	if (isNaN(operatorId)) return json({ error: 'operator_id required' }, { status: 400 });
 	return json(data.listToursForOperator(operatorId));
 };
 
 export const POST: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { operator_id, name } = body as { operator_id?: number; name?: string };
 	if (operator_id == null || !name?.trim()) {
@@ -21,7 +21,7 @@ export const POST: RequestHandler = async (event) => {
 };
 
 export const PATCH: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { id, name } = body as { id?: number; name?: string };
 	if (id == null || !name?.trim()) {
@@ -32,7 +32,7 @@ export const PATCH: RequestHandler = async (event) => {
 };
 
 export const DELETE: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const id = parseInt(event.url.searchParams.get('id') ?? '');
 	if (isNaN(id)) return json({ error: 'id required' }, { status: 400 });
 	data.deleteOperatorTour(id);

src/routes/(protected)/admin/api/provider-search/+server.ts

@@ -5,7 +5,7 @@ import { listTourOperators } from '$lib/server/admin/data.js';
 import { getProviderForOperator } from '$lib/server/admin/providers/index.js';
 
 export const GET: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 
 	const operatorId = parseInt(event.url.searchParams.get('operator_id') ?? '');
 	if (isNaN(operatorId)) return json({ error: 'operator_id required' }, { status: 400 });

src/routes/(protected)/admin/api/tour-operators/+server.ts

@@ -4,13 +4,13 @@ import { requireAdmin } from '$lib/server/admin/auth.js';
 import * as data from '$lib/server/admin/data.js';
 
 export const GET: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const q = event.url.searchParams.get('q') ?? undefined;
 	return json(data.listTourOperators(q));
 };
 
 export const POST: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { name, website, highlight_color } = body as {
 		name?: string;
@@ -24,7 +24,7 @@ export const POST: RequestHandler = async (event) => {
 };
 
 export const PATCH: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { id, name, website, highlight_color } = body as {
 		id?: number;
@@ -40,7 +40,7 @@ export const PATCH: RequestHandler = async (event) => {
 };
 
 export const DELETE: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const id = parseInt(event.url.searchParams.get('id') ?? '');
 	if (isNaN(id)) return json({ error: 'id required' }, { status: 400 });
 	data.deleteTourOperator(id);

src/routes/(protected)/admin/api/users/+server.ts

@@ -4,12 +4,12 @@ import { requireAdmin } from '$lib/server/admin/auth.js';
 import { deleteUser, listUsers, updateUser } from '$lib/server/users.js';
 
 export const GET: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	return json(listUsers());
 };
 
 export const PATCH: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const body = await event.request.json();
 	const { id, username, full_name, email } = body as {
 		id?: string;
@@ -25,7 +25,7 @@ export const PATCH: RequestHandler = async (event) => {
 };
 
 export const DELETE: RequestHandler = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 	const id = event.url.searchParams.get('id')?.trim();
 	if (!id) return json({ error: 'id required' }, { status: 400 });
 	deleteUser(id);

src/routes/(protected)/admin/tour-operators/[operatorId]/+page.server.ts

@@ -5,7 +5,7 @@ import { getProviderForOperator } from '$lib/server/admin/providers/index.js';
 import type { PageServerLoad, Actions } from './$types';
 
 export const load: PageServerLoad = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 
 	const operatorId = parseInt(event.params.operatorId);
 	if (isNaN(operatorId)) error(404, 'Not found');
@@ -27,7 +27,7 @@ export const load: PageServerLoad = async (event) => {
 
 export const actions: Actions = {
 	addTour: async (event) => {
-		requireAdmin((await event.locals.auth())?.user?.id);
+		requireAdmin((await event.locals.auth())?.user);
 
 		const operatorId = parseInt(event.params.operatorId);
 		if (isNaN(operatorId)) return fail(400, { error: 'Invalid operator ID' });
@@ -45,7 +45,7 @@ export const actions: Actions = {
 	},
 
 	editTour: async (event) => {
-		requireAdmin((await event.locals.auth())?.user?.id);
+		requireAdmin((await event.locals.auth())?.user);
 
 		const formData = await event.request.formData();
 		const id = parseInt(formData.get('id') as string);
@@ -63,7 +63,7 @@ export const actions: Actions = {
 	},
 
 	deleteTour: async (event) => {
-		requireAdmin((await event.locals.auth())?.user?.id);
+		requireAdmin((await event.locals.auth())?.user);
 
 		const formData = await event.request.formData();
 		const id = parseInt(formData.get('id') as string);
@@ -78,7 +78,7 @@ export const actions: Actions = {
 	},
 
 	importTour: async (event) => {
-		requireAdmin((await event.locals.auth())?.user?.id);
+		requireAdmin((await event.locals.auth())?.user);
 
 		const operatorId = parseInt(event.params.operatorId);
 		if (isNaN(operatorId)) return fail(400, { error: 'Invalid operator ID' });

src/routes/(protected)/admin/tour-operators/[operatorId]/tours/[tourId]/+page.server.ts

@@ -4,7 +4,7 @@ import * as data from '$lib/server/admin/data.js';
 import type { PageServerLoad, Actions } from './$types';
 
 export const load: PageServerLoad = async (event) => {
-	requireAdmin((await event.locals.auth())?.user?.id);
+	requireAdmin((await event.locals.auth())?.user);
 
 	const operatorId = parseInt(event.params.operatorId);
 	const tourId = parseInt(event.params.tourId);
@@ -27,7 +27,7 @@ export const load: PageServerLoad = async (event) => {
 
 export const actions: Actions = {
 	addDay: async (event) => {
-		requireAdmin((await event.locals.auth())?.user?.id);
+		requireAdmin((await event.locals.auth())?.user);
 
 		const tourId = parseInt(event.params.tourId);
 		if (isNaN(tourId)) return fail(400, { error: 'Invalid tour ID' });
@@ -45,7 +45,7 @@ export const actions: Actions = {
 	},
 
 	editDay: async (event) => {
-		requireAdmin((await event.locals.auth())?.user?.id);
+		requireAdmin((await event.locals.auth())?.user);
 
 		const formData = await event.request.formData();
 		const id = parseInt(formData.get('id') as string);
@@ -63,7 +63,7 @@ export const actions: Actions = {
 	},
 
 	deleteDay: async (event) => {
-		requireAdmin((await event.locals.auth())?.user?.id);
+		requireAdmin((await event.locals.auth())?.user);
 
 		const formData = await event.request.formData();
 		const id = parseInt(formData.get('id') as string);
@@ -78,7 +78,7 @@ export const actions: Actions = {
 	},
 
 	addDayPlan: async (event) => {
-		requireAdmin((await event.locals.auth())?.user?.id);
+		requireAdmin((await event.locals.auth())?.user);
 
 		const formData = await event.request.formData();
 		const dayId = parseInt(formData.get('dayId') as string);
@@ -247,7 +247,7 @@ export const actions: Actions = {
 	},
 
 	editDayPlan: async (event) => {
-		requireAdmin((await event.locals.auth())?.user?.id);
+		requireAdmin((await event.locals.auth())?.user);
 
 		const formData = await event.request.formData();
 		const id = parseInt(formData.get('id') as string);
@@ -310,7 +310,7 @@ export const actions: Actions = {
 	},
 
 	deleteDayPlan: async (event) => {
-		requireAdmin((await event.locals.auth())?.user?.id);
+		requireAdmin((await event.locals.auth())?.user);
 
 		const formData = await event.request.formData();
 		const id = parseInt(formData.get('id') as string);

src/routes/login/+page.server.ts

@@ -1,8 +1,20 @@
 import { env } from '$env/dynamic/private';
 import type { PageServerLoad } from './$types';
 
-export const load: PageServerLoad = async () => {
+const resolveErrorMessage = (value: string | null): string | null => {
+	if (!value) return null;
+	if (value === 'CredentialsSignin') return 'Invalid credentials';
+	return null;
+};
+
+export const load: PageServerLoad = async ({ url }) => {
+	const authUrl = process.env.AUTH_URL ?? env.AUTH_URL ?? '';
+	const localAuthEnabled = (process.env.LOCAL_AUTH_ENABLED ?? env.LOCAL_AUTH_ENABLED) === 'true';
+
 	return {
-		signinUrl: `${env.AUTH_URL}/signin/synology`
+		signinUrl: `${authUrl}/signin/synology`,
+		localSigninUrl: `${authUrl}/signin/local`,
+		localAuthEnabled,
+		error: resolveErrorMessage(url.searchParams.get('error'))
 	};
 };

src/routes/login/+page.svelte

@@ -1,22 +1,85 @@
 <script lang="ts">
-	import { onMount } from 'svelte';
-
 	let { data } = $props();
-	let form: HTMLFormElement;
-
-	onMount(() => {
-		form.submit();
-	});
 </script>
 
 <svelte:head>
 	<title>Sign in — Trips</title>
 </svelte:head>
 
-<form bind:this={form} method="POST" action={data.signinUrl} class="hidden">
+<div class="mx-auto flex min-h-[70vh] w-full max-w-3xl flex-col justify-center px-6 py-12">
-	<input type="hidden" name="csrfToken" />
+	<div class="mb-10">
-</form>
+		<h1 class="text-3xl font-semibold text-slate-900">Sign in</h1>
+		<p class="mt-2 text-sm text-slate-500">
+			Choose a sign-in method to access Trips.
+		</p>
+	</div>
 
-<div class="flex min-h-[60vh] items-center justify-center">
+	{#if data.error}
-	<p class="text-gray-500">Redirecting to sign in…</p>
+		<div class="mb-6 rounded-lg border border-rose-200 bg-rose-50 px-4 py-3 text-sm text-rose-700">
+			{data.error}
+		</div>
+	{/if}
+
+	<div class="grid gap-8 md:grid-cols-2">
+		<section class="rounded-2xl border border-slate-200 bg-white p-6 shadow-sm">
+			<h2 class="text-lg font-semibold text-slate-900">Synology account</h2>
+			<p class="mt-2 text-sm text-slate-500">
+				Use your Synology SSO account.
+			</p>
+			<form method="POST" action={data.signinUrl} class="mt-6">
+				<input type="hidden" name="csrfToken" />
+				<button
+					type="submit"
+					class="inline-flex w-full items-center justify-center rounded-lg bg-slate-900 px-4 py-2 text-sm font-semibold text-white transition hover:bg-slate-800"
+				>
+					Sign in with Synology
+				</button>
+			</form>
+		</section>
+
+		<section class="rounded-2xl border border-slate-200 bg-white p-6 shadow-sm">
+			<h2 class="text-lg font-semibold text-slate-900">Local account</h2>
+			<p class="mt-2 text-sm text-slate-500">
+				Sign in with your local username or email.
+			</p>
+			{#if data.localAuthEnabled}
+				<form method="POST" action={data.localSigninUrl} class="mt-6 space-y-4">
+					<input type="hidden" name="csrfToken" />
+					<div>
+						<label class="text-sm font-medium text-slate-700" for="identifier">
+							Username or email
+						</label>
+						<input
+							id="identifier"
+							name="identifier"
+							autocomplete="username"
+							class="mt-2 w-full rounded-lg border border-slate-200 px-3 py-2 text-sm text-slate-900 shadow-sm focus:border-slate-400 focus:outline-none"
+							required
+						/>
+					</div>
+					<div>
+						<label class="text-sm font-medium text-slate-700" for="password">Password</label>
+						<input
+							id="password"
+							name="password"
+							autocomplete="current-password"
+							type="password"
+							class="mt-2 w-full rounded-lg border border-slate-200 px-3 py-2 text-sm text-slate-900 shadow-sm focus:border-slate-400 focus:outline-none"
+							required
+						/>
+					</div>
+					<button
+						type="submit"
+						class="inline-flex w-full items-center justify-center rounded-lg border border-slate-300 bg-white px-4 py-2 text-sm font-semibold text-slate-900 transition hover:border-slate-400"
+					>
+						Sign in locally
+					</button>
+				</form>
+			{:else}
+				<div class="mt-6 rounded-lg border border-slate-200 bg-slate-50 px-4 py-3 text-sm text-slate-500">
+					Local sign-in is disabled.
+				</div>
+			{/if}
+		</section>
+	</div>
 </div>

src/routes/login/page.server.test.ts

@@ -0,0 +1,37 @@
+import { beforeEach, describe, expect, it } from 'vitest';
+import { load } from './+page.server';
+
+beforeEach(() => {
+	process.env.AUTH_URL = 'https://example.com/auth';
+});
+
+describe('login page load', () => {
+	it('returns auth options when local auth is enabled', async () => {
+		process.env.LOCAL_AUTH_ENABLED = 'true';
+		const result = await load({
+			url: new URL('https://example.com/login')
+		} as Parameters<typeof load>[0]);
+
+		expect(result.signinUrl).toBe('https://example.com/auth/signin/synology');
+		expect(result.localSigninUrl).toBe('https://example.com/auth/signin/local');
+		expect(result.localAuthEnabled).toBe(true);
+	});
+
+	it('maps credentials errors to a generic message', async () => {
+		process.env.LOCAL_AUTH_ENABLED = 'true';
+		const result = await load({
+			url: new URL('https://example.com/login?error=CredentialsSignin')
+		} as Parameters<typeof load>[0]);
+
+		expect(result.error).toBe('Invalid credentials');
+	});
+
+	it('disables local auth in the response when disabled', async () => {
+		process.env.LOCAL_AUTH_ENABLED = 'false';
+		const result = await load({
+			url: new URL('https://example.com/login')
+		} as Parameters<typeof load>[0]);
+
+		expect(result.localAuthEnabled).toBe(false);
+	});
+});