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444 lines
18 KiB
444 lines
18 KiB
import { ActionGroup } from 'app/common/ActionGroup';
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import { createEmptyActionSummary } from 'app/common/ActionSummary';
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import { Query } from 'app/common/ActiveDocAPI';
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import { BulkColValues, DocAction, TableDataAction, UserAction, CellValue } from 'app/common/DocActions';
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import { DocData } from 'app/common/DocData';
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import { ErrorWithCode } from 'app/common/ErrorWithCode';
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import { GranularAccessClause } from 'app/common/GranularAccessClause';
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import { canView } from 'app/common/roles';
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import { TableData } from 'app/common/TableData';
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import { Permissions } from 'app/gen-server/lib/Permissions';
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import { getDocSessionAccess, OptDocSession } from 'app/server/lib/DocSession';
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import pullAt = require('lodash/pullAt');
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// Actions that may be allowed for a user with nuanced access to a document, depending
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// on what table they refer to.
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const ACTION_WITH_TABLE_ID = new Set(['AddRecord', 'BulkAddRecord', 'UpdateRecord', 'BulkUpdateRecord',
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'RemoveRecord', 'BulkRemoveRecord',
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'ReplaceTableData', 'TableData',
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]);
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// Actions that won't be allowed (yet) for a user with nuanced access to a document.
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// A few may be innocuous, but generally I've put them in this list if there are problems
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// tracking down what table the refer to, or they could allow creation/modification of a
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// formula.
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const SPECIAL_ACTIONS = new Set(['InitNewDoc',
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'EvalCode',
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'SetDisplayFormula',
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'CreateViewSection',
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'UpdateSummaryViewSection',
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'DetachSummaryViewSection',
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'GenImporterView',
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'TransformAndFinishImport',
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'AddColumn', 'RemoveColumn', 'RenameColumn', 'ModifyColumn',
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'AddTable', 'RemoveTable', 'RenameTable',
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'AddView',
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'CopyFromColumn',
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'AddHiddenColumn',
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'RemoveViewSection'
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]);
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// Odd-ball actions marked as deprecated or which seem unlikely to be used.
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const SURPRISING_ACTIONS = new Set(['AddUser',
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'RemoveUser',
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'AddInstance',
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'RemoveInstance',
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'RemoveView',
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'AddViewSection',
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]);
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// Actions we'll allow unconditionally for now.
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const OK_ACTIONS = new Set(['Calculate', 'AddEmptyTable']);
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/**
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*
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* Manage granular access to a document. This allows nuances other than the coarse
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* owners/editors/viewers distinctions. As a placeholder for a future representation,
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* nuances are stored in the _grist_ACLResources table. Supported nauances:
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*
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* - {tableId, colIds: '~o'}: mark specified table as accessible by owners only.
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* - {tableId: '', colIds: '~o structure'}: mark doc structure as editable by owners only.
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* - {tableId, colIds: '~o row <colId>'}: mark specified table as editable only by
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* owner, and rows with <colId> falsy as accessible only by owner.
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*
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*/
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export class GranularAccess {
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private _resources: TableData;
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private _clauses = new Array<GranularAccessClause>();
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public constructor(private _docData: DocData) {
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this.update();
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}
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/**
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* Update granular access from DocData.
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*/
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public update() {
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this._resources = this._docData.getTable('_grist_ACLResources')!;
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this._clauses.length = 0;
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for (const res of this._resources.getRecords()) {
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const code = String(res.colIds);
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if (res.tableId && code === '~o') {
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this._clauses.push({
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kind: 'table',
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tableId: String(res.tableId),
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rule: 'only-owner-can-access',
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});
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}
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if (!res.tableId && code === '~o structure') {
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this._clauses.push({
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kind: 'doc',
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rule: 'only-owner-can-modify-structure',
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});
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}
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if (res.tableId && code.startsWith('~o row ')) {
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const colId = code.split(' ')[2] || 'RowAccess';
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this._clauses.push({
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kind: 'row',
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tableId: String(res.tableId),
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colId,
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rule: 'only-owner-can-edit-table-and-access-all-rows'
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});
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}
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}
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}
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/**
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* Check whether user can carry out query.
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*/
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public hasQueryAccess(docSession: OptDocSession, query: Query) {
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return this.hasTableAccess(docSession, query.tableId);
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}
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/**
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* Check whether user has access to table.
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*/
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public hasTableAccess(docSession: OptDocSession, tableId: string) {
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return Boolean(this.getTableAccess(docSession, tableId).permission & Permissions.VIEW);
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}
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/**
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* Filter DocActions to be sent to a client.
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*/
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public filterOutgoingDocActions(docSession: OptDocSession, docActions: DocAction[]): DocAction[] {
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return docActions.filter(action => this.canApplyUserAction(docSession, action, 'out'));
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}
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/**
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* Filter an ActionGroup to be sent to a client.
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*/
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public filterActionGroup(docSession: OptDocSession, actionGroup: ActionGroup): ActionGroup {
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if (!this.allowActionGroup(docSession, actionGroup)) { return actionGroup; }
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// For now, if there's any nuance at all, suppress the summary and description.
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// TODO: create an empty action summary, to be sure not to leak anything important.
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const result: ActionGroup = { ...actionGroup };
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result.actionSummary = createEmptyActionSummary();
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result.desc = '';
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return result;
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}
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/**
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* Check whether an ActionGroup can be sent to the client. TODO: in future, we'll want
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* to filter acceptible parts of ActionGroup, rather than denying entirely.
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*/
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public allowActionGroup(docSession: OptDocSession, actionGroup: ActionGroup): boolean {
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return this.canReadEverything(docSession);
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}
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/**
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* Check if user can apply a list of actions.
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*/
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public canApplyUserActions(docSession: OptDocSession, actions: UserAction[]): boolean {
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return actions.every(action => this.canApplyUserAction(docSession, action));
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}
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/**
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* Check if user can apply a given action.
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* When the direction is 'in', we are checking if it is ok for user to apply the
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* action on the document. When the direction is 'out', we are checking if it
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* is ok to send the action to the user's client.
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*/
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public canApplyUserAction(docSession: OptDocSession, a: UserAction|DocAction,
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direction: 'in' | 'out' = 'in'): boolean {
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const name = a[0] as string;
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if (OK_ACTIONS.has(name)) { return true; }
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if (SPECIAL_ACTIONS.has(name)) {
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// When broadcasting to client, allow renames etc for now.
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// This is a bit weak, since it leaks changes to private table schemas.
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// TODO: tighten up.
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if (direction === 'out') { return true; }
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return !this.hasNuancedAccess(docSession);
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}
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if (SURPRISING_ACTIONS.has(name)) {
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return this.hasFullAccess(docSession);
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}
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const isTableAction = ACTION_WITH_TABLE_ID.has(name);
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if (a[0] === 'ApplyUndoActions') {
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return this.canApplyUserActions(docSession, a[1] as UserAction[]);
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} else if (a[0] === 'ApplyDocActions') {
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return this.canApplyUserActions(docSession, a[1] as UserAction[]);
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} else if (isTableAction) {
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const tableId = a[1] as string;
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// Allow _grist_ table info to be broadcast to client unconditionally.
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// This is a bit weak, since it leaks changes to private table schemas.
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// TODO: tighten up.
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if (tableId.startsWith('_grist_') && direction === 'in') {
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return !this.hasNuancedAccess(docSession);
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}
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const tableAccess = this.getTableAccess(docSession, tableId);
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// For now, if there are any row restrictions, forbid editing.
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// To allow editing, we'll need something that has access to full row,
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// e.g. data engine (and then an equivalent for ondemand tables), or
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// to fetch rows at this point.
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if (tableAccess.rowPermissionFunctions.length > 0) {
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// If sending to client, for now just get it to reload from scratch,
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// we don't have the information we need to filter updates. Reloads
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// would be very annoying if user is working on something, but at least
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// data won't be stale. TODO: improve!
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if (direction === 'out') { throw new ErrorWithCode('NEED_RELOAD', 'document needs reload'); }
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return false;
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}
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return Boolean(tableAccess.permission & Permissions.VIEW);
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}
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return false;
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}
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/**
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* Check whether access is simple, or there are granular nuances that need to be
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* worked through. Currently if there are no owner-only tables, then everyone's
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* access is simple and without nuance.
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*/
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public hasNuancedAccess(docSession: OptDocSession): boolean {
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if (this._clauses.length === 0) { return false; }
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return !this.hasFullAccess(docSession);
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}
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/**
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* Check whether user can read everything in document.
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*/
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public canReadEverything(docSession: OptDocSession): boolean {
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for (const tableId of this.getTablesInClauses()) {
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const tableData = this.getTableAccess(docSession, tableId);
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if (!(tableData.permission & Permissions.VIEW) || tableData.rowPermissionFunctions.length > 0) {
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return false;
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}
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}
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return true;
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}
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/**
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* Check whether user has owner-level access to the document.
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*/
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public hasFullAccess(docSession: OptDocSession): boolean {
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const access = getDocSessionAccess(docSession);
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return access === 'owners';
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}
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/**
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* Check for view access to the document. For most code paths, a request or message
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* won't even be considered if there isn't view access, but there's no harm in double
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* checking.
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*/
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public hasViewAccess(docSession: OptDocSession): boolean {
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const access = getDocSessionAccess(docSession);
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return canView(access);
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}
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/**
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*
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* If the user does not have access to the full document, we need to filter out
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* parts of the document metadata. For simplicity, we overwrite rather than
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* filter for now, so that the overall structure remains consistent. We overwrite:
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*
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* - names, textual ids, formulas, and other textual options
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* - foreign keys linking columns/views/sections back to a forbidden table
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*
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* On the client, a page with a blank name will be marked gracefully as unavailable.
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*
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* Some information leaks, for example the existence of private tables and how
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* many columns they had, and something of the relationships between them. Long term,
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* it could be better to zap rows entirely, and do the work of cleaning up any cross
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* references to them.
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*
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*/
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public filterMetaTables(docSession: OptDocSession,
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tables: {[key: string]: TableDataAction}): {[key: string]: TableDataAction} {
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// If user has right to read everything, return immediately.
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if (this.canReadEverything(docSession)) { return tables; }
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// If we are going to modify metadata, make a copy.
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tables = JSON.parse(JSON.stringify(tables));
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// Collect a list of all tables (by tableRef) to which the user has no access.
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const censoredTables: Set<number> = new Set();
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for (const tableId of this.getTablesInClauses()) {
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if (this.hasTableAccess(docSession, tableId)) { continue; }
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const tableRef = this._docData.getTable('_grist_Tables')?.findRow('tableId', tableId);
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if (tableRef) { censoredTables.add(tableRef); }
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}
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// Collect a list of all sections and views containing a table to which the user has no access.
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const censoredSections: Set<number> = new Set();
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const censoredViews: Set<number> = new Set();
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for (const section of this._docData.getTable('_grist_Views_section')?.getRecords() || []) {
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if (!censoredTables.has(section.tableRef as number)) { continue; }
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if (section.parentId) { censoredViews.add(section.parentId as number); }
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censoredSections.add(section.id);
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}
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// Collect a list of all columns from tables to which the user has no access.
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const censoredColumns: Set<number> = new Set();
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for (const column of this._docData.getTable('_grist_Tables_column')?.getRecords() || []) {
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if (!censoredTables.has(column.parentId as number)) { continue; }
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censoredColumns.add(column.id);
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}
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// Collect a list of all fields from sections to which the user has no access.
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const censoredFields: Set<number> = new Set();
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for (const field of this._docData.getTable('_grist_Views_section_field')?.getRecords() || []) {
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if (!censoredSections.has(field.parentId as number)) { continue; }
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censoredFields.add(field.id);
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}
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// Clear the tableId for any tables the user does not have access to. This is just
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// to keep the name of the table private, in case its name itself is sensitive.
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// TODO: tableId may appear elsewhere, such as in _grist_ACLResources - user with
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// nuanced rights probably should not receive that table.
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this._censor(tables._grist_Tables, censoredTables, (idx, cols) => {
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cols.tableId[idx] = '';
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});
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// Clear the name of private views, in case the name itself is sensitive.
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this._censor(tables._grist_Views, censoredViews, (idx, cols) => {
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cols.name[idx] = '';
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});
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// Clear the title of private sections, and break the connection with the private
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// table as extra grit in the way of snooping.
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this._censor(tables._grist_Views_section, censoredSections, (idx, cols) => {
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cols.title[idx] = '';
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cols.tableRef[idx] = 0;
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});
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// Clear text metadata from private columns, and break the connection with the
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// private table.
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this._censor(tables._grist_Tables_column, censoredColumns, (idx, cols) => {
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cols.label[idx] = cols.colId[idx] = '';
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cols.widgetOptions[idx] = cols.formula[idx] = '';
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cols.type[idx] = 'Any';
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cols.parentId[idx] = 0;
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});
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// Clear text metadata from private fields, and break the connection with the
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// private table.
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this._censor(tables._grist_Views_section_field, censoredFields, (idx, cols) => {
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cols.widgetOptions[idx] = cols.filter[idx] = '';
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cols.parentId[idx] = 0;
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});
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return tables;
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}
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/**
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* Distill the clauses for the given session and table, to figure out the
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* access level and any row-level access functions needed.
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*/
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public getTableAccess(docSession: OptDocSession, tableId: string): TableAccess {
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const access = getDocSessionAccess(docSession);
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const isOwner = access === 'owners';
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const tableAccess: TableAccess = { permission: 0, rowPermissionFunctions: [] };
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let canChangeSchema: boolean = true;
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let canView: boolean = true;
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for (const clause of this._clauses) {
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if (clause.kind === 'doc' && clause.rule === 'only-owner-can-modify-structure') {
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const match = isOwner;
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if (!match) {
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canChangeSchema = false;
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}
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}
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if (clause.kind === 'table' && clause.tableId === tableId &&
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clause.rule === 'only-owner-can-access') {
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const match = isOwner;
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if (!match) {
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canView = false;
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}
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}
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if (clause.kind === 'row' && clause.tableId === tableId &&
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clause.rule === 'only-owner-can-edit-table-and-access-all-rows') {
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const match = isOwner;
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if (!match) {
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tableAccess.rowPermissionFunctions.push((rec) => {
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return rec.get(clause.colId) ? Permissions.OWNER : 0;
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});
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}
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}
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}
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tableAccess.permission = canView ? Permissions.OWNER : 0;
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if (!canChangeSchema) {
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tableAccess.permission = tableAccess.permission & ~Permissions.SCHEMA_EDIT;
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}
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return tableAccess;
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}
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/**
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* Get the set of all tables mentioned in access clauses.
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*/
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public getTablesInClauses(): Set<string> {
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const tables = new Set<string>();
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for (const clause of this._clauses) {
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if ('tableId' in clause) { tables.add(clause.tableId); }
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}
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return tables;
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}
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/**
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* Modify table data in place, removing any rows to which access
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* is not granted.
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*/
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public filterData(data: TableDataAction, tableAccess: TableAccess) {
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const toRemove: number[] = [];
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const rec = new RecordView(data, 0);
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for (let idx = 0; idx < data[2].length; idx++) {
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rec.index = idx;
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let permission = Permissions.OWNER;
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for (const fn of tableAccess.rowPermissionFunctions) {
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permission = permission & fn(rec);
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}
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if (!(permission & Permissions.VIEW)) {
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toRemove.push(idx);
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}
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}
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if (toRemove.length > 0) {
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pullAt(data[2], toRemove);
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const cols = data[3];
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for (const [, values] of Object.entries(cols)) {
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pullAt(values, toRemove);
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}
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}
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}
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/**
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* Modify the given TableDataAction in place by calling the supplied operation with
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* the indexes of any ids supplied and the columns in that TableDataAction.
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*/
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private _censor(table: TableDataAction, ids: Set<number>,
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op: (idx: number, cols: BulkColValues) => unknown) {
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const availableIds = table[2];
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const cols = table[3];
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for (let idx = 0; idx < availableIds.length; idx++) {
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if (ids.has(availableIds[idx])) { op(idx, cols); }
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}
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}
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}
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// A function that computes permissions given a record.
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export type PermissionFunction = (rec: RecordView) => number;
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// A summary of table-level access information.
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export interface TableAccess {
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permission: number;
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rowPermissionFunctions: Array<PermissionFunction>;
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}
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// A row-like view of TableDataAction, which is columnar in nature.
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export class RecordView {
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public constructor(public data: TableDataAction, public index: number) {
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}
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public get(colId: string): CellValue {
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if (colId === 'id') {
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return this.data[2][this.index];
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}
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return this.data[3][colId][this.index];
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}
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}
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