feat: Add two-factor authentication via TOTP

Adds TOTP setup with QR code, login challenge, recovery codes and
trusted devices that let a browser skip the second factor for 30
days. Admins can reset another user's second factor by confirming
with their own password.

server/api/controllers/users/setup-totp.js

@@ -0,0 +1,145 @@
+/*!
+ * Copyright (c) 2024 PLANKA Software GmbH
+ * Licensed under the Fair Use License: https://github.com/plankanban/planka/blob/master/LICENSE.md
+ */
+
+/**
+ * @swagger
+ * /users/{id}/totp/setup:
+ *   post:
+ *     summary: Begin TOTP enrollment
+ *     description: Generates a TOTP secret and provisioning URI for the authenticated user. The user is only fully enrolled after a successful call to /totp/enable.
+ *     tags:
+ *       - Users
+ *     operationId: setupUserTotp
+ *     parameters:
+ *       - in: path
+ *         name: id
+ *         required: true
+ *         schema:
+ *           type: string
+ *     requestBody:
+ *       required: true
+ *       content:
+ *         application/json:
+ *           schema:
+ *             type: object
+ *             required:
+ *               - currentPassword
+ *             properties:
+ *               currentPassword:
+ *                 type: string
+ *                 maxLength: 256
+ *     responses:
+ *       200:
+ *         description: TOTP setup initiated
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 item:
+ *                   type: object
+ *                   properties:
+ *                     secret:
+ *                       type: string
+ *                     provisioningUri:
+ *                       type: string
+ *       401:
+ *         $ref: '#/components/responses/Unauthorized'
+ *       403:
+ *         $ref: '#/components/responses/Forbidden'
+ *       404:
+ *         $ref: '#/components/responses/NotFound'
+ */
+
+const bcrypt = require('bcrypt');
+
+const { idInput } = require('../../../utils/inputs');
+
+const Errors = {
+  NOT_ENOUGH_RIGHTS: {
+    notEnoughRights: 'Not enough rights',
+  },
+  INVALID_CURRENT_PASSWORD: {
+    invalidCurrentPassword: 'Invalid current password',
+  },
+  USER_NOT_FOUND: {
+    userNotFound: 'User not found',
+  },
+};
+
+module.exports = {
+  inputs: {
+    id: {
+      ...idInput,
+      required: true,
+    },
+    currentPassword: {
+      type: 'string',
+      isNotEmptyString: true,
+      maxLength: 256,
+      required: true,
+    },
+  },
+
+  exits: {
+    notEnoughRights: {
+      responseType: 'forbidden',
+    },
+    invalidCurrentPassword: {
+      responseType: 'forbidden',
+    },
+    userNotFound: {
+      responseType: 'notFound',
+    },
+  },
+
+  async fn(inputs) {
+    const { currentUser } = this.req;
+
+    if (inputs.id !== currentUser.id) {
+      throw Errors.NOT_ENOUGH_RIGHTS;
+    }
+
+    const user = await User.qm.getOneById(inputs.id);
+    if (!user) {
+      throw Errors.USER_NOT_FOUND;
+    }
+
+    if (sails.config.custom.demoMode) {
+      throw Errors.NOT_ENOUGH_RIGHTS;
+    }
+
+    if (!user.password) {
+      throw Errors.NOT_ENOUGH_RIGHTS;
+    }
+
+    const isPasswordValid = await bcrypt.compare(inputs.currentPassword, user.password);
+    if (!isPasswordValid) {
+      throw Errors.INVALID_CURRENT_PASSWORD;
+    }
+
+    const secret = sails.helpers.utils.generateTotpSecret();
+    const provisioningUri = sails.helpers.utils.buildTotpUri.with({
+      account: user.email,
+      secret,
+      issuer: 'Planka',
+    });
+
+    // Only write the pending secret. Leave isTotpEnabled / totpEnabledAt /
+    // totpRecoveryCodes alone — they only change in enable-totp / disable-totp.
+    // Otherwise calling setup-totp while TOTP is already enabled would silently
+    // disable 2FA on the server side (password alone could turn off the second factor).
+    await User.qm.updateOne(user.id, {
+      totpSecret: secret,
+    });
+
+    return {
+      item: {
+        secret,
+        provisioningUri,
+      },
+    };
+  },
+};