549 lines
18 KiB
JavaScript
549 lines
18 KiB
JavaScript
// Load modules
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var Boom = require('boom');
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var Hoek = require('hoek');
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var Cryptiles = require('cryptiles');
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var Crypto = require('./crypto');
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var Utils = require('./utils');
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// Declare internals
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var internals = {};
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// Hawk authentication
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/*
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req: node's HTTP request object or an object as follows:
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var request = {
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method: 'GET',
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url: '/resource/4?a=1&b=2',
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host: 'example.com',
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port: 8080,
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authorization: 'Hawk id="dh37fgj492je", ts="1353832234", nonce="j4h3g2", ext="some-app-ext-data", mac="6R4rV5iE+NPoym+WwjeHzjAGXUtLNIxmo1vpMofpLAE="'
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};
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credentialsFunc: required function to lookup the set of Hawk credentials based on the provided credentials id.
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The credentials include the MAC key, MAC algorithm, and other attributes (such as username)
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needed by the application. This function is the equivalent of verifying the username and
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password in Basic authentication.
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var credentialsFunc = function (id, callback) {
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// Lookup credentials in database
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db.lookup(id, function (err, item) {
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if (err || !item) {
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return callback(err);
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}
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var credentials = {
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// Required
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key: item.key,
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algorithm: item.algorithm,
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// Application specific
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user: item.user
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};
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return callback(null, credentials);
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});
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};
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options: {
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hostHeaderName: optional header field name, used to override the default 'Host' header when used
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behind a cache of a proxy. Apache2 changes the value of the 'Host' header while preserving
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the original (which is what the module must verify) in the 'x-forwarded-host' header field.
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Only used when passed a node Http.ServerRequest object.
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nonceFunc: optional nonce validation function. The function signature is function(key, nonce, ts, callback)
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where 'callback' must be called using the signature function(err).
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timestampSkewSec: optional number of seconds of permitted clock skew for incoming timestamps. Defaults to 60 seconds.
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Provides a +/- skew which means actual allowed window is double the number of seconds.
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localtimeOffsetMsec: optional local clock time offset express in a number of milliseconds (positive or negative).
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Defaults to 0.
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payload: optional payload for validation. The client calculates the hash value and includes it via the 'hash'
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header attribute. The server always ensures the value provided has been included in the request
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MAC. When this option is provided, it validates the hash value itself. Validation is done by calculating
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a hash value over the entire payload (assuming it has already be normalized to the same format and
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encoding used by the client to calculate the hash on request). If the payload is not available at the time
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of authentication, the authenticatePayload() method can be used by passing it the credentials and
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attributes.hash returned in the authenticate callback.
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host: optional host name override. Only used when passed a node request object.
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port: optional port override. Only used when passed a node request object.
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}
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callback: function (err, credentials, artifacts) { }
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*/
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exports.authenticate = function (req, credentialsFunc, options, callback) {
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callback = Hoek.nextTick(callback);
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// Default options
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options.nonceFunc = options.nonceFunc || internals.nonceFunc;
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options.timestampSkewSec = options.timestampSkewSec || 60; // 60 seconds
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// Application time
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var now = Utils.now(options.localtimeOffsetMsec); // Measure now before any other processing
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// Convert node Http request object to a request configuration object
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var request = Utils.parseRequest(req, options);
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if (request instanceof Error) {
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return callback(Boom.badRequest(request.message));
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}
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// Parse HTTP Authorization header
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var attributes = Utils.parseAuthorizationHeader(request.authorization);
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if (attributes instanceof Error) {
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return callback(attributes);
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}
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// Construct artifacts container
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var artifacts = {
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method: request.method,
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host: request.host,
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port: request.port,
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resource: request.url,
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ts: attributes.ts,
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nonce: attributes.nonce,
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hash: attributes.hash,
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ext: attributes.ext,
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app: attributes.app,
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dlg: attributes.dlg,
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mac: attributes.mac,
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id: attributes.id
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};
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// Verify required header attributes
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if (!attributes.id ||
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!attributes.ts ||
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!attributes.nonce ||
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!attributes.mac) {
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return callback(Boom.badRequest('Missing attributes'), null, artifacts);
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}
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// Fetch Hawk credentials
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credentialsFunc(attributes.id, function (err, credentials) {
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if (err) {
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return callback(err, credentials || null, artifacts);
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}
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if (!credentials) {
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return callback(Boom.unauthorized('Unknown credentials', 'Hawk'), null, artifacts);
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}
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if (!credentials.key ||
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!credentials.algorithm) {
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return callback(Boom.internal('Invalid credentials'), credentials, artifacts);
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}
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if (Crypto.algorithms.indexOf(credentials.algorithm) === -1) {
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return callback(Boom.internal('Unknown algorithm'), credentials, artifacts);
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}
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// Calculate MAC
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var mac = Crypto.calculateMac('header', credentials, artifacts);
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if (!Cryptiles.fixedTimeComparison(mac, attributes.mac)) {
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return callback(Boom.unauthorized('Bad mac', 'Hawk'), credentials, artifacts);
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}
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// Check payload hash
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if (options.payload ||
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options.payload === '') {
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if (!attributes.hash) {
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return callback(Boom.unauthorized('Missing required payload hash', 'Hawk'), credentials, artifacts);
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}
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var hash = Crypto.calculatePayloadHash(options.payload, credentials.algorithm, request.contentType);
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if (!Cryptiles.fixedTimeComparison(hash, attributes.hash)) {
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return callback(Boom.unauthorized('Bad payload hash', 'Hawk'), credentials, artifacts);
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}
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}
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// Check nonce
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options.nonceFunc(credentials.key, attributes.nonce, attributes.ts, function (err) {
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if (err) {
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return callback(Boom.unauthorized('Invalid nonce', 'Hawk'), credentials, artifacts);
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}
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// Check timestamp staleness
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if (Math.abs((attributes.ts * 1000) - now) > (options.timestampSkewSec * 1000)) {
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var tsm = Crypto.timestampMessage(credentials, options.localtimeOffsetMsec);
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return callback(Boom.unauthorized('Stale timestamp', 'Hawk', tsm), credentials, artifacts);
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}
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// Successful authentication
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return callback(null, credentials, artifacts);
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});
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});
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};
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// Authenticate payload hash - used when payload cannot be provided during authenticate()
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/*
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payload: raw request payload
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credentials: from authenticate callback
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artifacts: from authenticate callback
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contentType: req.headers['content-type']
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*/
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exports.authenticatePayload = function (payload, credentials, artifacts, contentType) {
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var calculatedHash = Crypto.calculatePayloadHash(payload, credentials.algorithm, contentType);
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return Cryptiles.fixedTimeComparison(calculatedHash, artifacts.hash);
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};
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// Authenticate payload hash - used when payload cannot be provided during authenticate()
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/*
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calculatedHash: the payload hash calculated using Crypto.calculatePayloadHash()
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artifacts: from authenticate callback
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*/
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exports.authenticatePayloadHash = function (calculatedHash, artifacts) {
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return Cryptiles.fixedTimeComparison(calculatedHash, artifacts.hash);
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};
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// Generate a Server-Authorization header for a given response
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/*
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credentials: {}, // Object received from authenticate()
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artifacts: {} // Object received from authenticate(); 'mac', 'hash', and 'ext' - ignored
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options: {
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ext: 'application-specific', // Application specific data sent via the ext attribute
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payload: '{"some":"payload"}', // UTF-8 encoded string for body hash generation (ignored if hash provided)
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contentType: 'application/json', // Payload content-type (ignored if hash provided)
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hash: 'U4MKKSmiVxk37JCCrAVIjV=' // Pre-calculated payload hash
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}
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*/
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exports.header = function (credentials, artifacts, options) {
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// Prepare inputs
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options = options || {};
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if (!artifacts ||
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typeof artifacts !== 'object' ||
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typeof options !== 'object') {
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return '';
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}
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artifacts = Hoek.clone(artifacts);
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delete artifacts.mac;
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artifacts.hash = options.hash;
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artifacts.ext = options.ext;
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// Validate credentials
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if (!credentials ||
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!credentials.key ||
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!credentials.algorithm) {
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// Invalid credential object
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return '';
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}
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if (Crypto.algorithms.indexOf(credentials.algorithm) === -1) {
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return '';
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}
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// Calculate payload hash
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if (!artifacts.hash &&
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(options.payload || options.payload === '')) {
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artifacts.hash = Crypto.calculatePayloadHash(options.payload, credentials.algorithm, options.contentType);
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}
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var mac = Crypto.calculateMac('response', credentials, artifacts);
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// Construct header
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var header = 'Hawk mac="' + mac + '"' +
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(artifacts.hash ? ', hash="' + artifacts.hash + '"' : '');
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if (artifacts.ext !== null &&
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artifacts.ext !== undefined &&
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artifacts.ext !== '') { // Other falsey values allowed
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header += ', ext="' + Hoek.escapeHeaderAttribute(artifacts.ext) + '"';
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}
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return header;
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};
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/*
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* Arguments and options are the same as authenticate() with the exception that the only supported options are:
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* 'hostHeaderName', 'localtimeOffsetMsec', 'host', 'port'
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*/
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// 1 2 3 4
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internals.bewitRegex = /^(\/.*)([\?&])bewit\=([^&$]*)(?:&(.+))?$/;
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exports.authenticateBewit = function (req, credentialsFunc, options, callback) {
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callback = Hoek.nextTick(callback);
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// Application time
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var now = Utils.now(options.localtimeOffsetMsec);
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// Convert node Http request object to a request configuration object
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var request = Utils.parseRequest(req, options);
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if (request instanceof Error) {
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return callback(Boom.badRequest(request.message));
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}
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// Extract bewit
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if (request.url.length > Utils.limits.maxMatchLength) {
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return callback(Boom.badRequest('Resource path exceeds max length'));
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}
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var resource = request.url.match(internals.bewitRegex);
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if (!resource) {
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return callback(Boom.unauthorized(null, 'Hawk'));
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}
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// Bewit not empty
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if (!resource[3]) {
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return callback(Boom.unauthorized('Empty bewit', 'Hawk'));
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}
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// Verify method is GET
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if (request.method !== 'GET' &&
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request.method !== 'HEAD') {
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return callback(Boom.unauthorized('Invalid method', 'Hawk'));
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}
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// No other authentication
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if (request.authorization) {
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return callback(Boom.badRequest('Multiple authentications'));
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}
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// Parse bewit
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var bewitString = Hoek.base64urlDecode(resource[3]);
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if (bewitString instanceof Error) {
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return callback(Boom.badRequest('Invalid bewit encoding'));
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}
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// Bewit format: id\exp\mac\ext ('\' is used because it is a reserved header attribute character)
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var bewitParts = bewitString.split('\\');
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if (bewitParts.length !== 4) {
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return callback(Boom.badRequest('Invalid bewit structure'));
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}
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var bewit = {
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id: bewitParts[0],
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exp: parseInt(bewitParts[1], 10),
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mac: bewitParts[2],
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ext: bewitParts[3] || ''
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};
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if (!bewit.id ||
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!bewit.exp ||
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!bewit.mac) {
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return callback(Boom.badRequest('Missing bewit attributes'));
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}
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// Construct URL without bewit
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var url = resource[1];
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if (resource[4]) {
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url += resource[2] + resource[4];
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}
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// Check expiration
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if (bewit.exp * 1000 <= now) {
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return callback(Boom.unauthorized('Access expired', 'Hawk'), null, bewit);
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}
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// Fetch Hawk credentials
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credentialsFunc(bewit.id, function (err, credentials) {
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if (err) {
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return callback(err, credentials || null, bewit.ext);
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}
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if (!credentials) {
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return callback(Boom.unauthorized('Unknown credentials', 'Hawk'), null, bewit);
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}
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if (!credentials.key ||
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!credentials.algorithm) {
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return callback(Boom.internal('Invalid credentials'), credentials, bewit);
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}
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if (Crypto.algorithms.indexOf(credentials.algorithm) === -1) {
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return callback(Boom.internal('Unknown algorithm'), credentials, bewit);
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}
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// Calculate MAC
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var mac = Crypto.calculateMac('bewit', credentials, {
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ts: bewit.exp,
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nonce: '',
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method: 'GET',
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resource: url,
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host: request.host,
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port: request.port,
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ext: bewit.ext
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});
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if (!Cryptiles.fixedTimeComparison(mac, bewit.mac)) {
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return callback(Boom.unauthorized('Bad mac', 'Hawk'), credentials, bewit);
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}
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// Successful authentication
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return callback(null, credentials, bewit);
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});
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};
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/*
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* options are the same as authenticate() with the exception that the only supported options are:
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* 'nonceFunc', 'timestampSkewSec', 'localtimeOffsetMsec'
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*/
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exports.authenticateMessage = function (host, port, message, authorization, credentialsFunc, options, callback) {
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callback = Hoek.nextTick(callback);
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// Default options
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options.nonceFunc = options.nonceFunc || internals.nonceFunc;
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options.timestampSkewSec = options.timestampSkewSec || 60; // 60 seconds
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// Application time
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var now = Utils.now(options.localtimeOffsetMsec); // Measure now before any other processing
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// Validate authorization
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if (!authorization.id ||
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!authorization.ts ||
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!authorization.nonce ||
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!authorization.hash ||
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!authorization.mac) {
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return callback(Boom.badRequest('Invalid authorization'));
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}
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// Fetch Hawk credentials
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credentialsFunc(authorization.id, function (err, credentials) {
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if (err) {
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return callback(err, credentials || null);
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}
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if (!credentials) {
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return callback(Boom.unauthorized('Unknown credentials', 'Hawk'));
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}
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if (!credentials.key ||
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!credentials.algorithm) {
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return callback(Boom.internal('Invalid credentials'), credentials);
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}
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if (Crypto.algorithms.indexOf(credentials.algorithm) === -1) {
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return callback(Boom.internal('Unknown algorithm'), credentials);
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}
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// Construct artifacts container
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var artifacts = {
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ts: authorization.ts,
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nonce: authorization.nonce,
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host: host,
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port: port,
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hash: authorization.hash
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};
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// Calculate MAC
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var mac = Crypto.calculateMac('message', credentials, artifacts);
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if (!Cryptiles.fixedTimeComparison(mac, authorization.mac)) {
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return callback(Boom.unauthorized('Bad mac', 'Hawk'), credentials);
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}
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// Check payload hash
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var hash = Crypto.calculatePayloadHash(message, credentials.algorithm);
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if (!Cryptiles.fixedTimeComparison(hash, authorization.hash)) {
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return callback(Boom.unauthorized('Bad message hash', 'Hawk'), credentials);
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}
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// Check nonce
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options.nonceFunc(credentials.key, authorization.nonce, authorization.ts, function (err) {
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if (err) {
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return callback(Boom.unauthorized('Invalid nonce', 'Hawk'), credentials);
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}
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// Check timestamp staleness
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if (Math.abs((authorization.ts * 1000) - now) > (options.timestampSkewSec * 1000)) {
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return callback(Boom.unauthorized('Stale timestamp'), credentials);
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}
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// Successful authentication
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return callback(null, credentials);
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});
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});
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};
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internals.nonceFunc = function (key, nonce, ts, nonceCallback) {
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return nonceCallback(); // No validation
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};
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