/** * Controls the security of pad access */ /* * 2011 Peter 'Pita' Martischka (Primary Technology Ltd) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS-IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ var ERR = require("async-stacktrace"); var db = require("./DB").db; var async = require("async"); var authorManager = require("./AuthorManager"); var padManager = require("./PadManager"); var sessionManager = require("./SessionManager"); var settings = require("../utils/Settings") var randomString = require("../utils/randomstring"); /** * This function controlls the access to a pad, it checks if the user can access a pad. * @param padID the pad the user wants to access * @param sesssionID the session the user has (set via api) * @param token the token of the author (randomly generated at client side, used for public pads) * @param password the password the user has given to access this pad, can be null * @param callback will be called with (err, {accessStatus: grant|deny|wrongPassword|needPassword, authorID: a.xxxxxx}) */ exports.checkAccess = function (padID, sessionID, token, password, callback) { var statusObject; // a valid session is required (api-only mode) if(settings.requireSession) { // no sessionID, access is denied if(!sessionID) { callback(null, {accessStatus: "deny"}); return; } } // a session is not required, so we'll check if it's a public pad else { // it's not a group pad, means we can grant access if(padID.indexOf("$") == -1) { //get author for this token authorManager.getAuthor4Token(token, function(err, author) { if(ERR(err, callback)) return; // assume user has access statusObject = {accessStatus: "grant", authorID: author}; // user can't create pads if(settings.editOnly) { // check if pad exists padManager.doesPadExists(padID, function(err, exists) { if(ERR(err, callback)) return; // pad doesn't exist - user can't have access if(!exists) statusObject.accessStatus = "deny"; // grant or deny access, with author of token callback(null, statusObject); }); } // user may create new pads - no need to check anything else { // grant access, with author of token callback(null, statusObject); } }) //don't continue return; } } var groupID = padID.split("$")[0]; var padExists = false; var validSession = false; var sessionAuthor; var tokenAuthor; var isPublic; var isPasswordProtected; var passwordStatus = password == null ? "notGiven" : "wrong"; // notGiven, correct, wrong async.series([ //get basic informations from the database function(callback) { async.parallel([ //does pad exists function(callback) { padManager.doesPadExists(padID, function(err, exists) { if(ERR(err, callback)) return; padExists = exists; callback(); }); }, //get informations about this session function(callback) { sessionManager.getSessionInfo(sessionID, function(err, sessionInfo) { //skip session validation if the session doesn't exists if(err && err.message == "sessionID does not exist") { callback(); return; } if(ERR(err, callback)) return; var now = Math.floor(new Date().getTime()/1000); //is it for this group? and is validUntil still ok? --> validSession if(sessionInfo.groupID == groupID && sessionInfo.validUntil > now) { validSession = true; } sessionAuthor = sessionInfo.authorID; callback(); }); }, //get author for token function(callback) { //get author for this token authorManager.getAuthor4Token(token, function(err, author) { if(ERR(err, callback)) return; tokenAuthor = author; callback(); }); } ], callback); }, //get more informations of this pad, if avaiable function(callback) { //skip this if the pad doesn't exists if(padExists == false) { callback(); return; } padManager.getPad(padID, function(err, pad) { if(ERR(err, callback)) return; //is it a public pad? isPublic = pad.getPublicStatus(); //is it password protected? isPasswordProtected = pad.isPasswordProtected(); //is password correct? if(isPasswordProtected && password && pad.isCorrectPassword(password)) { passwordStatus = "correct"; } callback(); }); }, function(callback) { //- a valid session for this group is avaible AND pad exists if(validSession && padExists) { //- the pad is not password protected if(!isPasswordProtected) { //--> grant access statusObject = {accessStatus: "grant", authorID: sessionAuthor}; } //- the pad is password protected and password is correct else if(isPasswordProtected && passwordStatus == "correct") { //--> grant access statusObject = {accessStatus: "grant", authorID: sessionAuthor}; } //- the pad is password protected but wrong password given else if(isPasswordProtected && passwordStatus == "wrong") { //--> deny access, ask for new password and tell them that the password is wrong statusObject = {accessStatus: "wrongPassword"}; } //- the pad is password protected but no password given else if(isPasswordProtected && passwordStatus == "notGiven") { //--> ask for password statusObject = {accessStatus: "needPassword"}; } else { throw new Error("Ops, something wrong happend"); } } //- a valid session for this group avaible but pad doesn't exists else if(validSession && !padExists) { //--> grant access statusObject = {accessStatus: "grant", authorID: sessionAuthor}; //--> deny access if user isn't allowed to create the pad if(settings.editOnly) statusObject.accessStatus = "deny"; } // there is no valid session avaiable AND pad exists else if(!validSession && padExists) { //-- its public and not password protected if(isPublic && !isPasswordProtected) { //--> grant access, with author of token statusObject = {accessStatus: "grant", authorID: tokenAuthor}; } //- its public and password protected and password is correct else if(isPublic && isPasswordProtected && passwordStatus == "correct") { //--> grant access, with author of token statusObject = {accessStatus: "grant", authorID: tokenAuthor}; } //- its public and the pad is password protected but wrong password given else if(isPublic && isPasswordProtected && passwordStatus == "wrong") { //--> deny access, ask for new password and tell them that the password is wrong statusObject = {accessStatus: "wrongPassword"}; } //- its public and the pad is password protected but no password given else if(isPublic && isPasswordProtected && passwordStatus == "notGiven") { //--> ask for password statusObject = {accessStatus: "needPassword"}; } //- its not public else if(!isPublic) { //--> deny access statusObject = {accessStatus: "deny"}; } else { throw new Error("Ops, something wrong happend"); } } // there is no valid session avaiable AND pad doesn't exists else { //--> deny access statusObject = {accessStatus: "deny"}; } callback(); } ], function(err) { if(ERR(err, callback)) return; callback(null, statusObject); }); }