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+// Load modules
+
+var Boom = require('boom');
+var Hoek = require('hoek');
+var Cryptiles = require('cryptiles');
+var Crypto = require('./crypto');
+var Utils = require('./utils');
+
+
+// Declare internals
+
+var internals = {};
+
+
+// Hawk authentication
+
+/*
+ req: node's HTTP request object or an object as follows:
+
+ var request = {
+ method: 'GET',
+ url: '/resource/4?a=1&b=2',
+ host: 'example.com',
+ port: 8080,
+ authorization: 'Hawk id="dh37fgj492je", ts="1353832234", nonce="j4h3g2", ext="some-app-ext-data", mac="6R4rV5iE+NPoym+WwjeHzjAGXUtLNIxmo1vpMofpLAE="'
+ };
+
+ credentialsFunc: required function to lookup the set of Hawk credentials based on the provided credentials id.
+ The credentials include the MAC key, MAC algorithm, and other attributes (such as username)
+ needed by the application. This function is the equivalent of verifying the username and
+ password in Basic authentication.
+
+ var credentialsFunc = function (id, callback) {
+
+ // Lookup credentials in database
+ db.lookup(id, function (err, item) {
+
+ if (err || !item) {
+ return callback(err);
+ }
+
+ var credentials = {
+ // Required
+ key: item.key,
+ algorithm: item.algorithm,
+ // Application specific
+ user: item.user
+ };
+
+ return callback(null, credentials);
+ });
+ };
+
+ options: {
+
+ hostHeaderName: optional header field name, used to override the default 'Host' header when used
+ behind a cache of a proxy. Apache2 changes the value of the 'Host' header while preserving
+ the original (which is what the module must verify) in the 'x-forwarded-host' header field.
+ Only used when passed a node Http.ServerRequest object.
+
+ nonceFunc: optional nonce validation function. The function signature is function(nonce, ts, callback)
+ where 'callback' must be called using the signature function(err).
+
+ timestampSkewSec: optional number of seconds of permitted clock skew for incoming timestamps. Defaults to 60 seconds.
+ Provides a +/- skew which means actual allowed window is double the number of seconds.
+
+ localtimeOffsetMsec: optional local clock time offset express in a number of milliseconds (positive or negative).
+ Defaults to 0.
+
+ payload: optional payload for validation. The client calculates the hash value and includes it via the 'hash'
+ header attribute. The server always ensures the value provided has been included in the request
+ MAC. When this option is provided, it validates the hash value itself. Validation is done by calculating
+ a hash value over the entire payload (assuming it has already be normalized to the same format and
+ encoding used by the client to calculate the hash on request). If the payload is not available at the time
+ of authentication, the authenticatePayload() method can be used by passing it the credentials and
+ attributes.hash returned in the authenticate callback.
+ }
+
+ callback: function (err, credentials, artifacts) { }
+ */
+
+exports.authenticate = function (req, credentialsFunc, options, callback) {
+
+ // Default options
+
+ options.nonceFunc = options.nonceFunc || function (nonce, ts, callback) { return callback(); }; // No validation
+ options.timestampSkewSec = options.timestampSkewSec || 60; // 60 seconds
+
+ // Application time
+
+ var now = Utils.now() + (options.localtimeOffsetMsec || 0); // Measure now before any other processing
+
+ // Convert node Http request object to a request configuration object
+
+ var request = Utils.parseRequest(req, options);
+ if (request instanceof Error) {
+ return callback(Boom.badRequest(request.message));
+ }
+
+ // Parse HTTP Authorization header
+
+ var attributes = Utils.parseAuthorizationHeader(request.authorization);
+ if (attributes instanceof Error) {
+ return callback(attributes);
+ }
+
+ // Construct artifacts container
+
+ var artifacts = {
+ method: request.method,
+ host: request.host,
+ port: request.port,
+ resource: request.url,
+ ts: attributes.ts,
+ nonce: attributes.nonce,
+ hash: attributes.hash,
+ ext: attributes.ext,
+ app: attributes.app,
+ dlg: attributes.dlg,
+ mac: attributes.mac,
+ id: attributes.id
+ };
+
+ // Verify required header attributes
+
+ if (!attributes.id ||
+ !attributes.ts ||
+ !attributes.nonce ||
+ !attributes.mac) {
+
+ return callback(Boom.badRequest('Missing attributes'), null, artifacts);
+ }
+
+ // Fetch Hawk credentials
+
+ credentialsFunc(attributes.id, function (err, credentials) {
+
+ artifacts.credentials = credentials;
+
+ if (err) {
+ return callback(err, credentials || null, artifacts);
+ }
+
+ if (!credentials) {
+ return callback(Boom.unauthorized('Unknown credentials', 'Hawk'), null, artifacts);
+ }
+
+ if (!credentials.key ||
+ !credentials.algorithm) {
+
+ return callback(Boom.internal('Invalid credentials'), credentials, artifacts);
+ }
+
+ if (Crypto.algorithms.indexOf(credentials.algorithm) === -1) {
+ return callback(Boom.internal('Unknown algorithm'), credentials, artifacts);
+ }
+
+ // Calculate MAC
+
+ var mac = Crypto.calculateMac('header', artifacts);
+ if (!Cryptiles.fixedTimeComparison(mac, attributes.mac)) {
+ return callback(Boom.unauthorized('Bad mac', 'Hawk'), credentials, artifacts);
+ }
+
+ // Check payload hash
+
+ if (options.payload !== null &&
+ options.payload !== undefined) { // '' is valid
+
+ if (!attributes.hash) {
+ return callback(Boom.unauthorized('Missing required payload hash', 'Hawk'), credentials, artifacts);
+ }
+
+ var hash = Crypto.calculateHash(options.payload, credentials.algorithm, request.contentType);
+ if (!Cryptiles.fixedTimeComparison(hash, attributes.hash)) {
+ return callback(Boom.unauthorized('Bad payload hash', 'Hawk'), credentials, artifacts);
+ }
+ }
+
+ // Check nonce
+
+ options.nonceFunc(attributes.nonce, attributes.ts, function (err) {
+
+ if (err) {
+ return callback(Boom.unauthorized('Invalid nonce', 'Hawk'), credentials, artifacts);
+ }
+
+ // Check timestamp staleness
+
+ if (Math.abs((attributes.ts * 1000) - now) > (options.timestampSkewSec * 1000)) {
+ var fresh = Utils.now() + (options.localtimeOffsetMsec || 0); // Get fresh now
+ var tsm = Crypto.calculateTsMac(fresh, credentials);
+ return callback(Boom.unauthorized('Stale timestamp', 'Hawk', { ts: fresh, tsm: tsm }), credentials, artifacts);
+ }
+
+ // Successful authentication
+
+ return callback(null, credentials, artifacts);
+ });
+ });
+};
+
+
+// Authenticate payload hash - used when payload cannot be provided during authenticate()
+
+/*
+ payload: raw request payload
+ credentials: from authenticate callback
+ hash: from authenticate callback (artifacts.hash)
+ contentType: req.headers['content-type']
+*/
+
+exports.authenticatePayload = function (payload, credentials, hash, contentType) {
+
+ var calculatedHash = Crypto.calculateHash(payload, credentials.algorithm, contentType);
+ return Cryptiles.fixedTimeComparison(calculatedHash, hash);
+};
+
+
+// Generate a Server-Authorization header for a given response
+
+/*
+ artifacts: {} // Object received from authenticate(); 'mac', 'hash', and 'ext' - ignored
+ options: {
+ ext: 'application-specific', // Application specific data sent via the ext attribute
+ payload: '{"some":"payload"}', // UTF-8 encoded string for body hash generation (ignored if hash provided)
+ contentType: 'application/json', // Payload content-type (ignored if hash provided)
+ hash: 'U4MKKSmiVxk37JCCrAVIjV=' // Pre-calculated payload hash
+ }
+*/
+
+exports.header = function (artifacts, options) {
+
+ // Prepare inputs
+
+ options = options || {};
+
+ if (!artifacts ||
+ typeof artifacts !== 'object' ||
+ typeof options !== 'object') {
+
+ return '';
+ }
+
+ artifacts = Hoek.clone(artifacts);
+ delete artifacts.mac;
+ artifacts.hash = options.hash;
+ artifacts.ext = options.ext;
+
+ // Validate credentials
+
+ var credentials = artifacts.credentials;
+ if (!credentials ||
+ !credentials.key ||
+ !credentials.algorithm) {
+
+ // Invalid credential object
+ return '';
+ }
+
+ if (Crypto.algorithms.indexOf(credentials.algorithm) === -1) {
+ return '';
+ }
+
+ // Calculate payload hash
+
+ if (!artifacts.hash &&
+ options.hasOwnProperty('payload')) {
+
+ artifacts.hash = Crypto.calculateHash(options.payload, credentials.algorithm, options.contentType);
+ }
+
+ var mac = Crypto.calculateMac('response', artifacts);
+
+ // Construct header
+
+ var header = 'Hawk mac="' + mac + '"' +
+ (artifacts.hash ? ', hash="' + artifacts.hash + '"' : '');
+
+ if (artifacts.ext !== null &&
+ artifacts.ext !== undefined &&
+ artifacts.ext !== '') { // Other falsey values allowed
+
+ header += ', ext="' + Utils.escapeHeaderAttribute(artifacts.ext) + '"';
+ }
+
+ return header;
+};