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/disable-totp.js

@@ -0,0 +1,199 @@
+/*!
+ * 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:
+ *   delete:
+ *     summary: Disable / reset TOTP
+ *     description: Users disable their own TOTP by providing their current password and a valid TOTP or recovery code. Admins resetting another user's TOTP must re-enter their own password (step-up auth); this invalidates all of that user's sessions and trust cookies.
+ *     tags:
+ *       - Users
+ *     operationId: disableUserTotp
+ *     parameters:
+ *       - in: path
+ *         name: id
+ *         required: true
+ *         schema:
+ *           type: string
+ *     requestBody:
+ *       required: false
+ *       content:
+ *         application/json:
+ *           schema:
+ *             type: object
+ *             properties:
+ *               currentPassword:
+ *                 type: string
+ *                 maxLength: 256
+ *               code:
+ *                 type: string
+ *                 maxLength: 16
+ *     responses:
+ *       200:
+ *         description: TOTP disabled
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 item:
+ *                   $ref: '#/components/schemas/User'
+ *       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',
+  },
+  INVALID_TOTP_CODE: {
+    invalidTotpCode: 'Invalid TOTP code',
+  },
+  USER_NOT_FOUND: {
+    userNotFound: 'User not found',
+  },
+};
+
+const verifyOwnerCredentials = async (user, inputs) => {
+  if (!inputs.currentPassword) {
+    throw Errors.INVALID_CURRENT_PASSWORD;
+  }
+
+  const isPasswordValid = await bcrypt.compare(inputs.currentPassword, user.password);
+  if (!isPasswordValid) {
+    throw Errors.INVALID_CURRENT_PASSWORD;
+  }
+
+  if (!inputs.code) {
+    throw Errors.INVALID_TOTP_CODE;
+  }
+
+  if (user.totpSecret) {
+    const isCodeValid = sails.helpers.utils.verifyTotpCode.with({
+      code: inputs.code,
+      secret: user.totpSecret,
+    });
+    if (isCodeValid) return;
+  }
+
+  const recoveryCodes = user.totpRecoveryCodes || [];
+  // eslint-disable-next-line no-restricted-syntax
+  for (const hashed of recoveryCodes) {
+    // eslint-disable-next-line no-await-in-loop
+    if (await bcrypt.compare(inputs.code, hashed)) {
+      return;
+    }
+  }
+
+  throw Errors.INVALID_TOTP_CODE;
+};
+
+module.exports = {
+  inputs: {
+    id: {
+      ...idInput,
+      required: true,
+    },
+    currentPassword: {
+      type: 'string',
+      isNotEmptyString: true,
+      maxLength: 256,
+    },
+    code: {
+      type: 'string',
+      isNotEmptyString: true,
+      maxLength: 16,
+    },
+  },
+
+  exits: {
+    notEnoughRights: {
+      responseType: 'forbidden',
+    },
+    invalidCurrentPassword: {
+      responseType: 'forbidden',
+    },
+    invalidTotpCode: {
+      responseType: 'forbidden',
+    },
+    userNotFound: {
+      responseType: 'notFound',
+    },
+  },
+
+  async fn(inputs) {
+    const { currentSession, currentUser } = this.req;
+
+    const isSelf = inputs.id === currentUser.id;
+    const isAdmin = currentUser.role === User.Roles.ADMIN;
+
+    if (!isSelf && !isAdmin) {
+      throw Errors.USER_NOT_FOUND; // Forbidden
+    }
+
+    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 (isSelf) {
+      await verifyOwnerCredentials(user, inputs);
+    } else {
+      // Admin path: step-up by re-entering the admin's own password.
+      // Prevents a hijacked admin session from silently stripping 2FA off other users.
+      if (!inputs.currentPassword) {
+        throw Errors.INVALID_CURRENT_PASSWORD;
+      }
+      if (!currentUser.password) {
+        throw Errors.INVALID_CURRENT_PASSWORD;
+      }
+      const isAdminPasswordValid = await bcrypt.compare(
+        inputs.currentPassword,
+        currentUser.password,
+      );
+      if (!isAdminPasswordValid) {
+        throw Errors.INVALID_CURRENT_PASSWORD;
+      }
+    }
+
+    const { user: updatedUser } = await User.qm.updateOne(user.id, {
+      totpSecret: null,
+      isTotpEnabled: false,
+      totpEnabledAt: null,
+      totpRecoveryCodes: null,
+    });
+
+    await sails.helpers.trustedDevices.deleteAllForUser.with({ userId: user.id });
+
+    if (!isSelf) {
+      await sails.helpers.sessions.invalidateAllForUser.with({ userId: user.id });
+    } else if (currentSession) {
+      await sails.helpers.sessions.invalidateAllForUser.with({
+        userId: user.id,
+        exceptSessionId: currentSession.id,
+      });
+    }
+
+    return {
+      item: sails.helpers.users.presentOne(updatedUser, currentUser),
+    };
+  },
+};