mirror of
https://github.com/gristlabs/grist-core.git
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7e07f0ce56
Test Plan: Only tested manually that path is included. Reviewers: paulfitz Reviewed By: paulfitz Differential Revision: https://phab.getgrist.com/D3056
539 lines
22 KiB
TypeScript
539 lines
22 KiB
TypeScript
import {ApiError} from 'app/common/ApiError';
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import {OpenDocMode} from 'app/common/DocListAPI';
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import {ErrorWithCode} from 'app/common/ErrorWithCode';
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import {FullUser, UserProfile} from 'app/common/LoginSessionAPI';
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import {canEdit, canView, getWeakestRole, Role} from 'app/common/roles';
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import {Document} from 'app/gen-server/entity/Document';
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import {User} from 'app/gen-server/entity/User';
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import {DocAuthKey, DocAuthResult, HomeDBManager} from 'app/gen-server/lib/HomeDBManager';
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import {getSessionProfiles, getSessionUser, getSignInStatus, linkOrgWithEmail, SessionObj,
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SessionUserObj, SignInStatus} from 'app/server/lib/BrowserSession';
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import {RequestWithOrg} from 'app/server/lib/extractOrg';
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import {COOKIE_MAX_AGE, getAllowedOrgForSessionID, getCookieDomain,
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cookieName as sessionCookieName} from 'app/server/lib/gristSessions';
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import * as log from 'app/server/lib/log';
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import {IPermitStore, Permit} from 'app/server/lib/Permit';
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import {allowHost, optStringParam} from 'app/server/lib/requestUtils';
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import * as cookie from 'cookie';
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import {NextFunction, Request, RequestHandler, Response} from 'express';
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import * as onHeaders from 'on-headers';
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export interface RequestWithLogin extends Request {
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sessionID: string;
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session: SessionObj;
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org?: string;
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isCustomHost?: boolean; // when set, the request's domain is a recognized custom host linked
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// with the specified org.
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users?: UserProfile[];
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userId?: number;
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user?: User;
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userIsAuthorized?: boolean; // If userId is for "anonymous", this will be false.
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docAuth?: DocAuthResult; // For doc requests, the docId and the user's access level.
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specialPermit?: Permit;
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}
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/**
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* Extract the user id from a request, assuming we've added it via appropriate middleware.
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* Throws ApiError with code 401 (unauthorized) if the user id is missing.
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*/
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export function getUserId(req: Request): number {
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const userId = (req as RequestWithLogin).userId;
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if (!userId) {
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throw new ApiError("user not known", 401);
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}
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return userId;
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}
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/**
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* Extract the user object from a request, assuming we've added it via appropriate middleware.
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* Throws ApiError with code 401 (unauthorized) if the user is missing.
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*/
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export function getUser(req: Request): User {
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const user = (req as RequestWithLogin).user;
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if (!user) {
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throw new ApiError("user not known", 401);
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}
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return user;
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}
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/**
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* Extract the user profiles from a request, assuming we've added them via appropriate middleware.
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* Throws ApiError with code 401 (unauthorized) if the profiles are missing.
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*/
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export function getUserProfiles(req: Request): UserProfile[] {
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const users = (req as RequestWithLogin).users;
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if (!users) {
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throw new ApiError("user profile not found", 401);
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}
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return users;
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}
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// Extract the user id from a request, requiring it to be authorized (not an anonymous session).
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export function getAuthorizedUserId(req: Request) {
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const userId = getUserId(req);
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if (isAnonymousUser(req)) {
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throw new ApiError("user not authorized", 401);
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}
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return userId;
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}
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export function isAnonymousUser(req: Request) {
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return !(req as RequestWithLogin).userIsAuthorized;
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}
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// True if Grist is configured for a single user without specific authorization
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// (classic standalone/electron mode).
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export function isSingleUserMode(): boolean {
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return process.env.GRIST_SINGLE_USER === '1';
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}
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/**
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* Returns the express request object with user information added, if it can be
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* found based on passed in headers or the session. Specifically, sets:
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* - req.userId: the id of the user in the database users table
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* - req.userIsAuthorized: set if user has presented credentials that were accepted
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* (the anonymous user has a userId but does not have userIsAuthorized set if,
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* as would typically be the case, credentials were not presented)
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* - req.users: set for org-and-session-based logins, with list of profiles in session
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*/
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export async function addRequestUser(dbManager: HomeDBManager, permitStore: IPermitStore,
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req: Request, res: Response, next: NextFunction) {
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const mreq = req as RequestWithLogin;
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let profile: UserProfile|undefined;
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// First, check for an apiKey
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if (mreq.headers && mreq.headers.authorization) {
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// header needs to be of form "Bearer XXXXXXXXX" to apply
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const parts = String(mreq.headers.authorization).split(' ');
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if (parts[0] === "Bearer") {
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const user = parts[1] ? await dbManager.getUserByKey(parts[1]) : undefined;
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if (!user) {
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return res.status(401).send('Bad request: invalid API key');
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}
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if (user.id === dbManager.getAnonymousUserId()) {
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// We forbid the anonymous user to present an api key. That saves us
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// having to think through the consequences of authorized access to the
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// anonymous user's profile via the api (e.g. how should the api key be managed).
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return res.status(401).send('Credentials cannot be presented for the anonymous user account via API key');
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}
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mreq.user = user;
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mreq.userId = user.id;
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mreq.userIsAuthorized = true;
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}
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}
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// Special permission header for internal housekeeping tasks
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if (mreq.headers && mreq.headers.permit) {
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const permitKey = String(mreq.headers.permit);
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try {
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const permit = await permitStore.getPermit(permitKey);
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if (!permit) { return res.status(401).send('Bad request: unknown permit'); }
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mreq.user = dbManager.getAnonymousUser();
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mreq.userId = mreq.user.id;
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mreq.specialPermit = permit;
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} catch (err) {
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log.error(`problem reading permit: ${err}`);
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return res.status(401).send('Bad request: permit could not be read');
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}
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}
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// If we haven't already been authenticated, and this is not a GET/HEAD/OPTIONS, then
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// require that the X-Requested-With header field be set to XMLHttpRequest.
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// This is trivial for legitimate web clients to do, and an obstacle to
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// nefarious ones.
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// https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#use-of-custom-request-headers
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// https://markitzeroday.com/x-requested-with/cors/2017/06/29/csrf-mitigation-for-ajax-requests.html
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if (!mreq.userId && !mreq.xhr && !['GET', 'HEAD', 'OPTIONS'].includes(mreq.method)) {
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return res.status(401).send('Bad request (missing header)');
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}
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// A bit of extra info we'll add to the "Auth" log message when this request passes the check
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// for custom-host-specific sessionID.
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let customHostSession = '';
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// If we haven't selected a user by other means, and have profiles available in the
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// session, then select a user based on those profiles.
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const session = mreq.session;
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if (!mreq.userId && session && session.users && session.users.length > 0 &&
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mreq.org !== undefined) {
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// Prevent using custom-domain sessionID to authorize to a different domain, since
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// custom-domain owner could hijack such sessions.
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const allowedOrg = getAllowedOrgForSessionID(mreq.sessionID);
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if (allowedOrg) {
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if (allowHost(req, allowedOrg.host)) {
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customHostSession = ` custom-host-match ${allowedOrg.host}`;
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} else {
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// We need an exception for internal forwarding from home server to doc-workers. These use
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// internal hostnames, so we can't expect a custom domain. These requests do include an
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// Organization header, which we'll use to grant the exception, but security issues remain.
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// TODO Issue 1: an attacker can use a custom-domain request to get an API key, which is an
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// open door to all orgs accessible by this user.
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// TODO Issue 2: Organization header is easy for an attacker (who has stolen a session
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// cookie) to include too; it does nothing to prove that the request is internal.
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const org = req.header('organization');
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if (org && org === allowedOrg.org) {
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customHostSession = ` custom-host-fwd ${org}`;
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} else {
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// Log error and fail.
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log.warn("Auth[%s]: sessionID for host %s org %s; wrong for host %s org %s", mreq.method,
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allowedOrg.host, allowedOrg.org, mreq.get('host'), mreq.org);
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return res.status(403).send('Bad request: invalid session ID');
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}
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}
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}
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mreq.users = getSessionProfiles(session);
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// If we haven't set a maxAge yet, set it now.
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if (session && session.cookie && !session.cookie.maxAge) {
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session.cookie.maxAge = COOKIE_MAX_AGE;
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}
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// See if we have a profile linked with the active organization already.
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// TODO: implement userSelector for rest API, to allow "sticky" user selection on pages.
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let sessionUser: SessionUserObj|null = getSessionUser(session, mreq.org, optStringParam(mreq.query.user) || '');
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if (!sessionUser) {
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// No profile linked yet, so let's elect one.
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// Choose a profile that is no worse than the others available.
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const option = await dbManager.getBestUserForOrg(mreq.users, mreq.org);
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if (option) {
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// Modify request session object to link the current org with our choice of
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// profile. Express-session will save this change.
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sessionUser = linkOrgWithEmail(session, option.email, mreq.org);
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// In this special case of initially linking a profile, we need to look up the user's info.
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mreq.user = await dbManager.getUserByLogin(option.email);
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mreq.userId = option.id;
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mreq.userIsAuthorized = true;
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} else {
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// No profile has access to this org. We could choose to
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// link no profile, in which case user will end up
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// immediately presented with a sign-in page, or choose to
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// link an arbitrary profile (say, the first one the user
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// logged in as), in which case user will end up with a
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// friendlier page explaining the situation and offering to
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// add an account to resolve it. We go ahead and pick an
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// arbitrary profile.
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sessionUser = session.users[0];
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if (!session.orgToUser) { throw new Error("Session misconfigured"); }
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// Express-session will save this change.
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session.orgToUser[mreq.org] = 0;
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}
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}
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profile = sessionUser && sessionUser.profile || undefined;
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// If we haven't computed a userId yet, check for one using an email address in the profile.
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// A user record will be created automatically for emails we've never seen before.
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if (profile && !mreq.userId) {
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const user = await dbManager.getUserByLoginWithRetry(profile.email, profile);
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if (user) {
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mreq.user = user;
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mreq.userId = user.id;
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mreq.userIsAuthorized = true;
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}
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}
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}
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// If no userId has been found yet, fall back on anonymous.
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if (!mreq.userId) {
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const anon = dbManager.getAnonymousUser();
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mreq.user = anon;
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mreq.userId = anon.id;
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mreq.userIsAuthorized = false;
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mreq.users = [dbManager.makeFullUser(anon)];
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}
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log.debug("Auth[%s]: id %s email %s host %s path %s org %s%s", mreq.method,
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mreq.userId, mreq.user?.loginEmail, mreq.get('host'), mreq.path, mreq.org,
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customHostSession);
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return next();
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}
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/**
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* Returns a handler that redirects the user to a login or signup page.
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*/
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export function redirectToLoginUnconditionally(
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getLoginRedirectUrl: (req: Request, redirectUrl: URL) => Promise<string>,
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getSignUpRedirectUrl: (req: Request, redirectUrl: URL) => Promise<string>
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) {
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return async (req: Request, resp: Response, next: NextFunction) => {
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const mreq = req as RequestWithLogin;
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// Tell express-session to set our cookie: session handling post-login relies on it.
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mreq.session.alive = true;
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// Redirect to sign up if it doesn't look like the user has ever logged in (on
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// this browser) After logging in, `users` will be set in the session. Even after
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// logging out again, `users` will still be set.
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const signUp: boolean = (mreq.session.users === undefined);
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log.debug(`Authorizer: redirecting to ${signUp ? 'sign up' : 'log in'}`);
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const redirectUrl = new URL(req.protocol + '://' + req.get('host') + req.originalUrl);
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if (signUp) {
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return resp.redirect(await getSignUpRedirectUrl(req, redirectUrl));
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} else {
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return resp.redirect(await getLoginRedirectUrl(req, redirectUrl));
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}
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};
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}
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/**
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* Middleware to redirects user to a login page when the user is not
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* logged in. If allowExceptions is set, then we make an exception
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* for a team site allowing anonymous access, or a personal doc
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* allowing anonymous access, or the merged org.
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*/
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export function redirectToLogin(
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allowExceptions: boolean,
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getLoginRedirectUrl: (req: Request, redirectUrl: URL) => Promise<string>,
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getSignUpRedirectUrl: (req: Request, redirectUrl: URL) => Promise<string>,
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dbManager: HomeDBManager
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): RequestHandler {
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const redirectUnconditionally = redirectToLoginUnconditionally(getLoginRedirectUrl,
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getSignUpRedirectUrl);
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return async (req: Request, resp: Response, next: NextFunction) => {
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const mreq = req as RequestWithLogin;
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mreq.session.alive = true; // This will ensure that express-session will set our cookie
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// if it hasn't already - we'll need it if we redirect.
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if (mreq.userIsAuthorized) { return next(); }
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try {
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// Otherwise it's an anonymous user. Proceed normally only if the org allows anon access,
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// or if the org is not set (FlexServer._redirectToOrg will deal with that case).
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if (mreq.userId && allowExceptions) {
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// Anonymous user has qualified access to merged org.
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// If no org is set, leave it to other middleware. One common case where the
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// org is not set is when it is embedded in the url, and the user visits '/'.
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// If we immediately require a login, it could fail if no cookie exists yet.
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// Also, '/o/docs' allows anonymous access.
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if (!mreq.org || dbManager.isMergedOrg(mreq.org)) { return next(); }
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const result = await dbManager.getOrg({userId: mreq.userId}, mreq.org);
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if (result.status === 200) { return next(); }
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}
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// In all other cases (including unknown org), redirect user to login or sign up.
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return redirectUnconditionally(req, resp, next);
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} catch (err) {
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log.info("Authorizer failed to redirect", err.message);
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return resp.status(401).send(err.message);
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}
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};
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}
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/**
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* Sets mreq.docAuth if not yet set, and returns it.
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*/
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export async function getOrSetDocAuth(
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mreq: RequestWithLogin, dbManager: HomeDBManager, urlId: string
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): Promise<DocAuthResult> {
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if (!mreq.docAuth) {
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let effectiveUserId = getUserId(mreq);
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if (mreq.specialPermit && mreq.userId === dbManager.getAnonymousUserId()) {
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effectiveUserId = dbManager.getPreviewerUserId();
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}
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mreq.docAuth = await dbManager.getDocAuthCached({urlId, userId: effectiveUserId, org: mreq.org});
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if (mreq.specialPermit && mreq.userId === dbManager.getAnonymousUserId() &&
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mreq.specialPermit.docId === mreq.docAuth.docId) {
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mreq.docAuth = {...mreq.docAuth, access: 'owners'};
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}
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}
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return mreq.docAuth;
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}
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export interface ResourceSummary {
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kind: 'doc';
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id: string|number;
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}
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/**
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*
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* Handle authorization for a single document accessed by a given user.
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*
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*/
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export interface Authorizer {
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// get the id of user, or null if no authorization in place.
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getUserId(): number|null;
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// get user profile if available.
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getUser(): FullUser|null;
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// get the id of the document.
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getDocId(): string;
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// get any link parameters in place when accessing the resource.
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getLinkParameters(): Record<string, string>;
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// Fetch the doc metadata from HomeDBManager.
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getDoc(): Promise<Document>;
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// Check access, throw error if the requested level of access isn't available.
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assertAccess(role: 'viewers'|'editors'|'owners'): Promise<void>;
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// Get the lasted access information calculated for the doc. This is useful
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// for logging - but access control itself should use assertAccess() to
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// ensure the data is fresh.
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getCachedAuth(): DocAuthResult;
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}
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/**
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*
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* Handle authorization for a single document and user.
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*
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*/
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export class DocAuthorizer implements Authorizer {
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constructor(
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private _dbManager: HomeDBManager,
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private _key: DocAuthKey,
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public readonly openMode: OpenDocMode,
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public readonly linkParameters: Record<string, string>,
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private _docAuth?: DocAuthResult,
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private _profile?: UserProfile
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) {
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}
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public getUserId(): number {
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return this._key.userId;
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}
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public getUser(): FullUser|null {
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return this._profile ? {id: this.getUserId(), ...this._profile} : null;
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}
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public getDocId(): string {
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// We've been careful to require urlId === docId, see DocManager.
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return this._key.urlId;
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}
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public getLinkParameters(): Record<string, string> {
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return this.linkParameters;
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}
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public async getDoc(): Promise<Document> {
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return this._dbManager.getDoc(this._key);
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}
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public async assertAccess(role: 'viewers'|'editors'|'owners'): Promise<void> {
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const docAuth = await this._dbManager.getDocAuthCached(this._key);
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this._docAuth = docAuth;
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assertAccess(role, docAuth, {openMode: this.openMode});
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}
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public getCachedAuth(): DocAuthResult {
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if (!this._docAuth) { throw Error('no cached authentication'); }
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return this._docAuth;
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}
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}
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export class DummyAuthorizer implements Authorizer {
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constructor(public role: Role|null, public docId: string) {}
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public getUserId() { return null; }
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public getUser() { return null; }
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public getDocId() { return this.docId; }
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public getLinkParameters() { return {}; }
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public async getDoc(): Promise<Document> { throw new Error("Not supported in standalone"); }
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public async assertAccess() { /* noop */ }
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public getCachedAuth(): DocAuthResult {
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return {
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access: this.role,
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docId: this.docId,
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removed: false,
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};
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}
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}
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export function assertAccess(
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role: 'viewers'|'editors'|'owners', docAuth: DocAuthResult, options: {
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openMode?: OpenDocMode,
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allowRemoved?: boolean,
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} = {}) {
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const openMode = options.openMode || 'default';
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const details = {status: 403, accessMode: openMode};
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if (docAuth.error) {
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if ([400, 401, 403].includes(docAuth.error.status)) {
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|
// For these error codes, we know our access level - forbidden. Make errors more uniform.
|
|
throw new ErrorWithCode("AUTH_NO_VIEW", "No view access", details);
|
|
}
|
|
throw docAuth.error;
|
|
}
|
|
|
|
if (docAuth.removed && !options.allowRemoved) {
|
|
throw new ErrorWithCode("AUTH_NO_VIEW", "Document is deleted", {status: 404});
|
|
}
|
|
|
|
// If docAuth has no error, the doc is accessible, but we should still check the level (in case
|
|
// it's possible to access the doc with a level less than "viewer").
|
|
if (!canView(docAuth.access)) {
|
|
throw new ErrorWithCode("AUTH_NO_VIEW", "No view access", details);
|
|
}
|
|
|
|
if (role === 'editors') {
|
|
// If opening in a fork or view mode, treat user as viewer and deny write access.
|
|
const access = (openMode === 'fork' || openMode === 'view') ?
|
|
getWeakestRole('viewers', docAuth.access) : docAuth.access;
|
|
if (!canEdit(access)) {
|
|
throw new ErrorWithCode("AUTH_NO_EDIT", "No write access", details);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Pull out headers to pass along to a proxied service. Focussed primarily on
|
|
* authentication.
|
|
*/
|
|
export function getTransitiveHeaders(req: Request): {[key: string]: string} {
|
|
const Authorization = req.get('Authorization');
|
|
const Cookie = req.get('Cookie');
|
|
const PermitHeader = req.get('Permit');
|
|
const Organization = (req as RequestWithOrg).org;
|
|
const XRequestedWith = req.get('X-Requested-With');
|
|
const Origin = req.get('Origin'); // Pass along the original Origin since it may
|
|
// play a role in granular access control.
|
|
return {
|
|
...(Authorization ? { Authorization } : undefined),
|
|
...(Cookie ? { Cookie } : undefined),
|
|
...(Organization ? { Organization } : undefined),
|
|
...(PermitHeader ? { Permit: PermitHeader } : undefined),
|
|
...(XRequestedWith ? { 'X-Requested-With': XRequestedWith } : undefined),
|
|
...(Origin ? { Origin } : undefined),
|
|
};
|
|
}
|
|
|
|
export const signInStatusCookieName = sessionCookieName + '_status';
|
|
|
|
// We expose a sign-in status in a cookie accessible to all subdomains, to assist in auto-signin.
|
|
// Its value is SignInStatus ("S", "M" or unset). This middleware keeps this cookie in sync with
|
|
// the session state.
|
|
//
|
|
// Note that this extra cookie isn't strictly necessary today: since it has similar settings to
|
|
// the session cookie, subdomains can infer status from that one. It is here in anticipation that
|
|
// we make sessions a host-only cookie, to avoid exposing it to externally-hosted subdomains of
|
|
// getgrist.com. In that case, the sign-in status cookie would remain a 2nd-level domain cookie.
|
|
export function signInStatusMiddleware(req: Request, resp: Response, next: NextFunction) {
|
|
const mreq = req as RequestWithLogin;
|
|
|
|
let origSignInStatus: SignInStatus = '';
|
|
if (req.headers.cookie) {
|
|
const cookies = cookie.parse(req.headers.cookie);
|
|
origSignInStatus = cookies[signInStatusCookieName] || '';
|
|
}
|
|
|
|
onHeaders(resp, () => {
|
|
const newSignInStatus = getSignInStatus(mreq.session);
|
|
if (newSignInStatus !== origSignInStatus) {
|
|
// If not signed-in any more, set a past date to delete this cookie.
|
|
const expires = (newSignInStatus && mreq.session.cookie.expires) || new Date(0);
|
|
resp.append('Set-Cookie', cookie.serialize(signInStatusCookieName, newSignInStatus, {
|
|
httpOnly: false, // make available to client-side scripts
|
|
expires,
|
|
domain: getCookieDomain(req),
|
|
path: '/',
|
|
sameSite: 'lax', // same setting as for grist-sid is fine here.
|
|
}));
|
|
}
|
|
});
|
|
next();
|
|
}
|