187 lines
4.3 KiB
JavaScript
187 lines
4.3 KiB
JavaScript
'use strict';
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// Load modules
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const Sntp = require('sntp');
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const Boom = require('boom');
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// Declare internals
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const internals = {};
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exports.version = function () {
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return require('../package.json').version;
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};
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exports.limits = {
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maxMatchLength: 4096 // Limit the length of uris and headers to avoid a DoS attack on string matching
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};
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// Extract host and port from request
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// $1 $2
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internals.hostHeaderRegex = /^(?:(?:\r\n)?\s)*((?:[^:]+)|(?:\[[^\]]+\]))(?::(\d+))?(?:(?:\r\n)?\s)*$/; // (IPv4, hostname)|(IPv6)
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exports.parseHost = function (req, hostHeaderName) {
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hostHeaderName = (hostHeaderName ? hostHeaderName.toLowerCase() : 'host');
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const hostHeader = req.headers[hostHeaderName];
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if (!hostHeader) {
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return null;
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}
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if (hostHeader.length > exports.limits.maxMatchLength) {
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return null;
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}
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const hostParts = hostHeader.match(internals.hostHeaderRegex);
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if (!hostParts) {
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return null;
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}
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return {
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name: hostParts[1],
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port: (hostParts[2] ? hostParts[2] : (req.connection && req.connection.encrypted ? 443 : 80))
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};
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};
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// Parse Content-Type header content
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exports.parseContentType = function (header) {
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if (!header) {
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return '';
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}
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return header.split(';')[0].trim().toLowerCase();
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};
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// Convert node's to request configuration object
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exports.parseRequest = function (req, options) {
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if (!req.headers) {
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return req;
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}
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// Obtain host and port information
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let host;
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if (!options.host ||
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!options.port) {
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host = exports.parseHost(req, options.hostHeaderName);
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if (!host) {
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return new Error('Invalid Host header');
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}
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}
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const request = {
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method: req.method,
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url: req.url,
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host: options.host || host.name,
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port: options.port || host.port,
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authorization: req.headers.authorization,
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contentType: req.headers['content-type'] || ''
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};
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return request;
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};
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exports.now = function (localtimeOffsetMsec) {
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return Sntp.now() + (localtimeOffsetMsec || 0);
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};
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exports.nowSecs = function (localtimeOffsetMsec) {
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return Math.floor(exports.now(localtimeOffsetMsec) / 1000);
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};
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internals.authHeaderRegex = /^(\w+)(?:\s+(.*))?$/; // Header: scheme[ something]
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internals.attributeRegex = /^[ \w\!#\$%&'\(\)\*\+,\-\.\/\:;<\=>\?@\[\]\^`\{\|\}~]+$/; // !#$%&'()*+,-./:;<=>?@[]^_`{|}~ and space, a-z, A-Z, 0-9
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// Parse Hawk HTTP Authorization header
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exports.parseAuthorizationHeader = function (header, keys) {
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keys = keys || ['id', 'ts', 'nonce', 'hash', 'ext', 'mac', 'app', 'dlg'];
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if (!header) {
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return Boom.unauthorized(null, 'Hawk');
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}
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if (header.length > exports.limits.maxMatchLength) {
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return Boom.badRequest('Header length too long');
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}
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const headerParts = header.match(internals.authHeaderRegex);
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if (!headerParts) {
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return Boom.badRequest('Invalid header syntax');
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}
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const scheme = headerParts[1];
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if (scheme.toLowerCase() !== 'hawk') {
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return Boom.unauthorized(null, 'Hawk');
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}
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const attributesString = headerParts[2];
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if (!attributesString) {
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return Boom.badRequest('Invalid header syntax');
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}
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const attributes = {};
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let errorMessage = '';
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const verify = attributesString.replace(/(\w+)="([^"\\]*)"\s*(?:,\s*|$)/g, ($0, $1, $2) => {
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// Check valid attribute names
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if (keys.indexOf($1) === -1) {
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errorMessage = 'Unknown attribute: ' + $1;
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return;
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}
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// Allowed attribute value characters
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if ($2.match(internals.attributeRegex) === null) {
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errorMessage = 'Bad attribute value: ' + $1;
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return;
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}
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// Check for duplicates
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if (attributes.hasOwnProperty($1)) {
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errorMessage = 'Duplicate attribute: ' + $1;
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return;
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}
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attributes[$1] = $2;
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return '';
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});
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if (verify !== '') {
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return Boom.badRequest(errorMessage || 'Bad header format');
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}
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return attributes;
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};
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exports.unauthorized = function (message, attributes) {
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return Boom.unauthorized(message || null, 'Hawk', attributes);
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};
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