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Merge pull request #291 from AzureAD/dev
Release 3.0.6
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| Original file line number | Diff line number | Diff line change |
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| /** | ||
| * Copyright (c) Microsoft Corporation | ||
| * All Rights Reserved | ||
| * MIT License | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy of this | ||
| * software and associated documentation files (the "Software"), to deal in the Software | ||
| * without restriction, including without limitation the rights to use, copy, modify, | ||
| * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to | ||
| * permit persons to whom the Software is furnished to do so, subject to the following | ||
| * conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be | ||
| * included in all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS | ||
| * OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | ||
| * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT | ||
| * OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
| */ | ||
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| 'use restrict'; | ||
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| var crypto = require('crypto'); | ||
| var createBuffer = require('./jwe').createBuffer; | ||
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| /* | ||
| * the handler for state/nonce/policy | ||
| * @maxAmount - the max amount of {state: x, nonce: x, policy: x} tuples you want to save in cookie | ||
| * @maxAge - when a tuple in session expires in seconds | ||
| * @cookieEncryptionKeys | ||
| * - keys used to encrypt and decrypt cookie | ||
| */ | ||
| function CookieContentHandler(maxAmount, maxAge, cookieEncryptionKeys) { | ||
| if (!maxAge || (typeof maxAge !== 'number' || maxAge <= 0)) | ||
| throw new Error('CookieContentHandler: maxAge must be a positive number'); | ||
| this.maxAge = maxAge; // seconds | ||
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| if (!maxAmount || (typeof maxAmount !== 'number' || maxAmount <= 0 || maxAmount % 1 !== 0)) | ||
| throw new Error('CookieContentHandler: maxAmount must be a positive integer'); | ||
| this.maxAmount = maxAmount; | ||
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| if (!cookieEncryptionKeys || !Array.isArray(cookieEncryptionKeys) || cookieEncryptionKeys.length === 0) | ||
| throw new Error('CookieContentHandler: cookieEncryptionKeys must be a non-emptry array'); | ||
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| for (var i = 0; i < cookieEncryptionKeys.length; i++) { | ||
| var item = cookieEncryptionKeys[i]; | ||
| if (!item.key || !item.iv) | ||
| throw new Error(`CookieContentHandler: array item ${i+1} in cookieEncryptionKeys must have the form { key: , iv: }`); | ||
| if (item.key.length !== 32) | ||
| throw new Error(`CookieContentHandler: key number ${i+1} is ${item.key.length} bytes, expected: 32 bytes`); | ||
| if (item.iv.length !== 12) | ||
| throw new Error(`CookieContentHandler: iv number ${i+1} is ${item.iv.length} bytes, expected: 12 bytes`); | ||
| } | ||
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| this.cookieEncryptionKeys = cookieEncryptionKeys; | ||
| } | ||
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| CookieContentHandler.prototype.findAndDeleteTupleByState = function(req, res, stateToFind) { | ||
| if (!req.cookies) | ||
| throw new Error('Cookie is not found in request. Did you forget to use cookie parsing middleware such as cookie-parser?'); | ||
|
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| var cookieEncryptionKeys = this.cookieEncryptionKeys; | ||
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| var tuple = null; | ||
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| // try every key and every cookie | ||
| for (var i = 0; i < cookieEncryptionKeys.length; i++) { | ||
| var item = cookieEncryptionKeys[i]; | ||
| var key = createBuffer(item.key); | ||
| var iv = createBuffer(item.iv); | ||
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| for (var cookie in req.cookies) { | ||
| if (req.cookies.hasOwnProperty(cookie) && cookie.startsWith('passport-aad.')) { | ||
| var encrypted = cookie.substring(13); | ||
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| try { | ||
| var decrypted = decryptCookie(encrypted, key, iv); | ||
| tuple = JSON.parse(decrypted); | ||
| } catch (ex) { | ||
| continue; | ||
| } | ||
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| if (tuple.state === stateToFind) { | ||
| res.clearCookie(cookie); | ||
| return tuple; | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| return null; | ||
| }; | ||
|
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| CookieContentHandler.prototype.add = function(req, res, tupleToAdd) { | ||
| var cookies = []; | ||
|
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| // collect the related cookies | ||
| for (var cookie in req.cookies) { | ||
| if (req.cookies.hasOwnProperty(cookie) && cookie.startsWith('passport-aad.')) | ||
| cookies.push(cookie); | ||
| } | ||
|
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| // only keep the most recent maxAmount-1 many cookies | ||
| if (cookies.length > this.maxAmount - 1) { | ||
| cookies.sort(); | ||
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| var numberToRemove = cookies.length - (this.maxAmount - 1); | ||
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| for (var i = 0; i < numberToRemove; i++) { | ||
| res.clearCookie(cookies[0]); | ||
| cookies.shift(); | ||
| } | ||
| } | ||
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| // add the new cookie | ||
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| var tupleString = JSON.stringify(tupleToAdd); | ||
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| var item = this.cookieEncryptionKeys[0]; | ||
| var key = createBuffer(item.key); | ||
| var iv = createBuffer(item.iv); | ||
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| var encrypted = encryptCookie(tupleString, key, iv); | ||
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| res.cookie('passport-aad.' + Date.now() + '.' + encrypted, 0, { maxAge: this.maxAge * 1000, httpOnly: true }); | ||
| }; | ||
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| var encryptCookie = function(content, key, iv) { | ||
| var cipher = crypto.createCipheriv('aes-256-gcm', key, iv); | ||
|
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| var encrypted = cipher.update(content, 'utf8', 'hex'); | ||
| encrypted += cipher.final('hex'); | ||
| var authTag = cipher.getAuthTag().toString('hex'); | ||
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| return encrypted + '.' + authTag; | ||
| }; | ||
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| var decryptCookie = function(encrypted, key, iv) { | ||
| var parts = encrypted.split('.'); | ||
| if (parts.length !== 3) | ||
| throw new Error('invalid cookie'); | ||
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| // the first part is timestamp, ignore it | ||
| var content = createBuffer(parts[1], 'hex'); | ||
| var authTag = createBuffer(parts[2], 'hex'); | ||
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| var decipher = crypto.createDecipheriv('aes-256-gcm', key, iv); | ||
| decipher.setAuthTag(authTag); | ||
| var decrypted = decipher.update(content, 'hex', 'utf8'); | ||
| decrypted += decipher.final('utf8'); | ||
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| return decrypted; | ||
| }; | ||
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| exports.CookieContentHandler = CookieContentHandler; | ||
|
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