Add password reset feature for admin users, enforce password change on login, and enhance session management

src/app/(app)/admin/users/page.tsx

@@ -5,6 +5,7 @@ import {
   deleteUserAction,
 } from "@/app/actions/users";
 import { Flash } from "@/components/flash";
+import { ResetUserPassword } from "@/components/reset-user-password";
 import { requireAdminUser } from "@/lib/auth";
 import { db, initDatabase } from "@/lib/db";
 import { formatDate, queryMessage } from "@/lib/format";
@@ -34,6 +35,9 @@ export default async function AdminUsersPage({
     )
     .all() as UserRow[];
   const adminCount = users.filter((u) => u.role === "admin").length;
+  const currentAdminKeyCount = db
+    .prepare("SELECT COUNT(*) AS count FROM webauthn_credentials WHERE user_id = ?")
+    .get(currentUser.id) as { count: number };
 
   return (
     <>
@@ -93,12 +97,20 @@ export default async function AdminUsersPage({
                     </td>
                     <td>{formatDate(row.created_at.slice(0, 10))}</td>
                     <td>
-                      {!isSelf && !lastAdmin && (
+                      {!isSelf && (
+                        <div className="user-admin-actions">
+                          <ResetUserPassword
+                            userId={row.id}
+                            requiresYubiKey={currentAdminKeyCount.count > 0}
+                          />
+                          {!lastAdmin && (
                             <form action={deleteUserAction} className="inline-form">
                               <input type="hidden" name="id" value={row.id} />
                               <button className="link-button danger" type="submit">Löschen</button>
                             </form>
                           )}
+                        </div>
+                      )}
                     </td>
                   </tr>
                 );

src/app/actions/auth.ts

@@ -1,11 +1,12 @@
 "use server";
 
 import { compareSync, hashSync } from "bcryptjs";
-import { redirect } from "next/navigation";
+import { redirect, unstable_rethrow } from "next/navigation";
 import {
   authenticateUser,
   clearPendingAdminMfaCookie,
   clearSessionCookie,
+  getSessionUser,
   setPendingAdminMfaCookie,
   requireSessionUser,
   setSessionCookie,
@@ -77,10 +78,45 @@ export async function changePasswordAction(formData: FormData) {
     redirect(messageUrl("/account", "error", "Das aktuelle Passwort ist falsch."));
   }
 
-  db.prepare("UPDATE users SET password_hash = ? WHERE id = ?").run(hashSync(newPassword, 12), user.id);
+  db.prepare(
+    "UPDATE users SET password_hash = ?, must_change_password = 0 WHERE id = ?",
+  ).run(hashSync(newPassword, 12), user.id);
   redirect(messageUrl("/account", "success", "Passwort wurde geändert."));
 }
 
+export async function completeRequiredPasswordChangeAction(formData: FormData) {
+  const user = await getSessionUser();
+  if (!user) redirect("/login");
+  if (!user.mustChangePassword) redirect("/");
+  initDatabase();
+
+  try {
+    const newPassword = passwordValue(formData, "new_password");
+    if (newPassword !== String(formData.get("confirm_password") ?? "")) {
+      throw new Error("Die neuen Passwörter stimmen nicht überein.");
+    }
+    const row = db.prepare("SELECT password_hash FROM users WHERE id = ?").get(user.id) as
+      | { password_hash: string }
+      | undefined;
+    if (!row) throw new Error("Benutzer wurde nicht gefunden.");
+    if (compareSync(newPassword, row.password_hash)) {
+      throw new Error("Das neue Passwort muss sich vom temporären Passwort unterscheiden.");
+    }
+
+    db.prepare(
+      "UPDATE users SET password_hash = ?, must_change_password = 0 WHERE id = ? AND active = 1",
+    ).run(hashSync(newPassword, 12), user.id);
+    redirect("/");
+  } catch (error) {
+    unstable_rethrow(error);
+    redirect(messageUrl(
+      "/change-password",
+      "error",
+      error instanceof Error ? error.message : "Das Passwort konnte nicht geändert werden.",
+    ));
+  }
+}
+
 export async function removeAdminSecurityKeyAction(formData: FormData) {
   const user = await requireAdminUser();
   initDatabase();

src/app/actions/users.ts

@@ -1,13 +1,22 @@
 "use server";
 
-import { randomUUID } from "node:crypto";
+import { randomBytes, randomUUID } from "node:crypto";
 import { hashSync } from "bcryptjs";
 import { redirect, unstable_rethrow } from "next/navigation";
-import { requireAdminUser } from "@/lib/auth";
+import {
+  consumePasswordResetMfaAuthorization,
+  requireAdminUser,
+} from "@/lib/auth";
 import { db, initDatabase, transaction } from "@/lib/db";
 import { idValue, passwordValue, roleValue, usernameValue } from "@/lib/validation";
 import type { UserRole } from "@/lib/types";
 
+export type ResetUserPasswordState = {
+  error?: string;
+  password?: string;
+  userName?: string;
+};
+
 function go(kind: "error" | "success", message: string): never {
   redirect(`/admin/users?${kind}=${encodeURIComponent(message)}`);
 }
@@ -70,6 +79,56 @@ export async function changeUserRoleAction(formData: FormData) {
   }
 }
 
+export async function resetUserPasswordAction(
+  _previousState: ResetUserPasswordState,
+  formData: FormData,
+): Promise<ResetUserPasswordState> {
+  const currentUser = await requireAdminUser();
+  initDatabase();
+
+  try {
+    const id = idValue(formData);
+    if (id === currentUser.id) {
+      throw new Error("Das eigene Passwort kann unter „Konto“ geändert werden.");
+    }
+    const keyCount = db
+      .prepare("SELECT COUNT(*) AS count FROM webauthn_credentials WHERE user_id = ?")
+      .get(currentUser.id) as { count: number };
+    if (
+      keyCount.count > 0
+      && !await consumePasswordResetMfaAuthorization(currentUser.id, id)
+    ) {
+      throw new Error("Der Passwort-Reset muss mit deinem YubiKey bestätigt werden.");
+    }
+
+    const password = randomBytes(18).toString("base64url");
+    const passwordHash = hashSync(password, 12);
+    let userName = "";
+    transaction(() => {
+      const target = db
+        .prepare("SELECT name FROM users WHERE id = ? AND active = 1")
+        .get(id) as { name: string } | undefined;
+      if (!target) throw new Error("Benutzer wurde nicht gefunden.");
+
+      userName = target.name;
+      db.prepare(
+        "UPDATE users SET password_hash = ?, must_change_password = 1 WHERE id = ?",
+      )
+        .run(passwordHash, id);
+      db.prepare(
+        `UPDATE user_sessions
+         SET revoked_at = CURRENT_TIMESTAMP
+         WHERE user_id = ? AND revoked_at IS NULL`,
+      ).run(id);
+    });
+
+    return { password, userName };
+  } catch (error) {
+    unstable_rethrow(error);
+    return { error: errorMessage(error) };
+  }
+}
+
 export async function deleteUserAction(formData: FormData) {
   const currentUser = await requireAdminUser();
   initDatabase();

src/app/api/auth/webauthn/login/verify/route.ts

@@ -71,11 +71,27 @@ export async function POST(request: Request) {
   );
 
   const user = db
-    .prepare("SELECT id, name, email, role FROM users WHERE id = ? AND active = 1 AND role = 'admin'")
-    .get(userId) as { id: number; name: string; email: string; role: "admin" } | undefined;
+    .prepare(
+      `SELECT id, name, email, role,
+              must_change_password AS mustChangePassword
+       FROM users
+       WHERE id = ? AND active = 1 AND role = 'admin'`,
+    )
+    .get(userId) as
+      | {
+          id: number;
+          name: string;
+          email: string;
+          role: "admin";
+          mustChangePassword: number;
+        }
+      | undefined;
   if (!user) return NextResponse.json({ error: "Benutzer wurde nicht gefunden." }, { status: 401 });
 
-  const token = await createSessionToken(user, {
+  const token = await createSessionToken({
+    ...user,
+    mustChangePassword: user.mustChangePassword === 1,
+  }, {
     userAgent: request.headers.get("user-agent"),
     ipAddress:
       request.headers.get("x-forwarded-for")?.split(",")[0] ??

src/app/attachments/[id]/route.ts

@@ -16,7 +16,7 @@ type AttachmentRow = {
 
 export async function GET(_request: NextRequest, ctx: RouteContext<"/attachments/[id]">) {
   const user = await getSessionUser();
-  if (!user) {
+  if (!user || user.mustChangePassword) {
     return new Response("Nicht angemeldet.", { status: 401 });
   }
 

src/app/globals.css

@@ -675,6 +675,47 @@ input[type="file"] { padding: 0.4rem; background: var(--paper); }
 .inline-form { display: inline-flex; align-items: center; gap: 0.4rem; margin: 0; }
 .inline-form select { width: auto; }
 
+.user-admin-actions,
+.password-reset {
+  display: flex;
+  align-items: flex-start;
+  gap: 0.65rem;
+}
+
+.user-admin-actions {
+  flex-direction: column;
+}
+
+.password-reset {
+  flex-direction: column;
+}
+
+.password-reset-error {
+  margin: 0;
+  color: var(--rust);
+  font-size: 0.82rem;
+}
+
+.temporary-password {
+  display: grid;
+  gap: 0.3rem;
+  min-width: 17rem;
+  padding: 0.65rem;
+  border: 1px solid var(--green);
+  border-radius: 6px;
+  background: var(--green-soft);
+}
+
+.temporary-password code {
+  user-select: all;
+  overflow-wrap: anywhere;
+  font-size: 1rem;
+}
+
+.temporary-password small {
+  color: var(--steel);
+}
+
 .badge {
   margin-left: 0.5rem;
   font-family: var(--font-head);

src/app/login/page.tsx

@@ -15,7 +15,8 @@ export default async function LoginPage({
   searchParams: Promise<Record<string, string | string[] | undefined>>;
 }) {
   initDatabase();
-  if (await getSessionUser()) redirect("/");
+  const user = await getSessionUser();
+  if (user) redirect(user.mustChangePassword ? "/change-password" : "/");
   const params = await searchParams;
   return (
     <main className="login-page">

src/lib/auth.ts

@@ -19,8 +19,16 @@ type AdminMfaPayload = {
   exp: number;
 };
 
+type PasswordResetMfaPayload = {
+  uid: number;
+  target: number;
+  purpose: "password-reset";
+  exp: number;
+};
+
 export const SESSION_COOKIE = "moped_session";
 export const ADMIN_MFA_COOKIE = "moped_admin_mfa";
+export const PASSWORD_RESET_MFA_COOKIE = "moped_password_reset_mfa";
 const SESSION_TTL_SECONDS = 60 * 60 * 24 * 30;
 const ADMIN_MFA_TTL_SECONDS = 60 * 5;
 
@@ -137,6 +145,38 @@ export async function clearPendingAdminMfaCookie() {
   (await cookies()).delete(ADMIN_MFA_COOKIE);
 }
 
+export async function createPasswordResetMfaToken(adminId: number, targetUserId: number) {
+  return new SignJWT({
+    uid: adminId,
+    target: targetUserId,
+    purpose: "password-reset",
+  })
+    .setProtectedHeader({ alg: "HS256" })
+    .setIssuedAt()
+    .setExpirationTime(`${ADMIN_MFA_TTL_SECONDS}s`)
+    .sign(getSecretKey());
+}
+
+export async function consumePasswordResetMfaAuthorization(
+  adminId: number,
+  targetUserId: number,
+) {
+  const cookieStore = await cookies();
+  const token = cookieStore.get(PASSWORD_RESET_MFA_COOKIE)?.value;
+  cookieStore.delete(PASSWORD_RESET_MFA_COOKIE);
+  if (!token) return false;
+
+  try {
+    const result = await jwtVerify(token, getSecretKey());
+    const payload = result.payload as unknown as PasswordResetMfaPayload;
+    return payload.uid === adminId
+      && payload.target === targetUserId
+      && payload.purpose === "password-reset";
+  } catch {
+    return false;
+  }
+}
+
 export async function getSessionUser(): Promise<SessionUser | null> {
   const token = (await cookies()).get(SESSION_COOKIE)?.value;
   if (!token) return null;
@@ -148,7 +188,8 @@ export async function getSessionUser(): Promise<SessionUser | null> {
     initDatabase();
     const user = db
       .prepare(
-        `SELECT u.id, u.name, u.email, u.role
+        `SELECT u.id, u.name, u.email, u.role,
+                u.must_change_password AS mustChangePassword
          FROM user_sessions s
          JOIN users u ON u.id = s.user_id
          WHERE s.id = ? AND s.user_id = ?
@@ -157,7 +198,13 @@ export async function getSessionUser(): Promise<SessionUser | null> {
            AND u.active = 1`,
       )
       .get(payload.sid, Number(payload.id)) as
-      | { id: number; name: string; email: string; role: UserRole }
+      | {
+          id: number;
+          name: string;
+          email: string;
+          role: UserRole;
+          mustChangePassword: number;
+        }
       | undefined;
     if (!user) return null;
     db.prepare(
@@ -166,7 +213,9 @@ export async function getSessionUser(): Promise<SessionUser | null> {
        WHERE id = ?
          AND last_seen_at < datetime('now', '-30 seconds')`,
     ).run(payload.sid);
-    return user ?? null;
+    return user
+      ? { ...user, mustChangePassword: user.mustChangePassword === 1 }
+      : null;
   } catch {
     return null;
   }
@@ -187,6 +236,7 @@ export async function getCurrentSessionId() {
 export async function requireSessionUser() {
   const user = await getSessionUser();
   if (!user) redirect("/login");
+  if (user.mustChangePassword) redirect("/change-password");
   return user;
 }
 
@@ -200,12 +250,29 @@ export function authenticateUser(username: string, password: string): SessionUse
   initDatabase();
   const users = db
     .prepare(
-      "SELECT id, name, email, role, password_hash FROM users WHERE name = ? COLLATE NOCASE AND active = 1 ORDER BY id ASC",
+      `SELECT id, name, email, role, password_hash,
+              must_change_password AS mustChangePassword
+       FROM users
+       WHERE name = ? COLLATE NOCASE AND active = 1
+       ORDER BY id ASC`,
     )
-    .all(username.trim()) as (SessionUser & { password_hash: string })[];
+    .all(username.trim()) as {
+      id: number;
+      name: string;
+      email: string;
+      role: UserRole;
+      password_hash: string;
+      mustChangePassword: number;
+    }[];
   if (users.length !== 1) return null;
   const user = users[0];
 
   if (!user || !compareSync(password, user.password_hash)) return null;
-  return { id: user.id, name: user.name, email: user.email, role: user.role };
+  return {
+    id: user.id,
+    name: user.name,
+    email: user.email,
+    role: user.role,
+    mustChangePassword: Boolean(user.mustChangePassword),
+  };
 }

src/lib/db.ts

@@ -29,6 +29,7 @@ function ensureSchema() {
       password_hash TEXT NOT NULL,
       role TEXT NOT NULL CHECK (role IN ('admin', 'member')),
       active INTEGER NOT NULL DEFAULT 1 CHECK (active IN (0, 1)),
+      must_change_password INTEGER NOT NULL DEFAULT 0 CHECK (must_change_password IN (0, 1)),
       deleted_at TEXT,
       created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
     ) STRICT;
@@ -226,6 +227,11 @@ function ensureSchema() {
   if (!userColumns.some((column) => column.name === "deleted_at")) {
     db.exec("ALTER TABLE users ADD COLUMN deleted_at TEXT");
   }
+  if (!userColumns.some((column) => column.name === "must_change_password")) {
+    db.exec(
+      "ALTER TABLE users ADD COLUMN must_change_password INTEGER NOT NULL DEFAULT 0 CHECK (must_change_password IN (0, 1))",
+    );
+  }
 
   const motorcycleColumns = db.prepare("PRAGMA table_info(motorcycles)").all() as { name: string }[];
   if (!motorcycleColumns.some((column) => column.name === "tire_pressure_front_bar")) {

src/lib/types.ts

@@ -15,6 +15,7 @@ export type SessionUser = {
   name: string;
   email: string;
   role: UserRole;
+  mustChangePassword: boolean;
 };
 
 export type MotorcycleSummary = {