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78 lines
2.5 KiB
78 lines
2.5 KiB
'use strict';
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var crypto = require('crypto');
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var utility = require('utility');
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var AUTH_KEY_VALUE_RE = /(\w+)=["']?([^'"]+)["']?/;
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var NC = 0;
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var NC_PAD = '00000000';
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function digestAuthHeader(method, uri, wwwAuthenticate, userpass) {
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var parts = wwwAuthenticate.split(',');
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var opts = {};
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for (var i = 0; i < parts.length; i++) {
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var m = parts[i].match(AUTH_KEY_VALUE_RE);
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if (m) {
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opts[m[1]] = m[2].replace(/["']/g, '');
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}
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}
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if (!opts.realm || !opts.nonce) {
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return '';
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}
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var qop = opts.qop || '';
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// WWW-Authenticate: Digest realm="testrealm@host.com",
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// qop="auth,auth-int",
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// nonce="dcd98b7102dd2f0e8b11d0f600bfb0c093",
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// opaque="5ccc069c403ebaf9f0171e9517f40e41"
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// Authorization: Digest username="Mufasa",
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// realm="testrealm@host.com",
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// nonce="dcd98b7102dd2f0e8b11d0f600bfb0c093",
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// uri="/dir/index.html",
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// qop=auth,
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// nc=00000001,
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// cnonce="0a4f113b",
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// response="6629fae49393a05397450978507c4ef1",
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// opaque="5ccc069c403ebaf9f0171e9517f40e41"
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// HA1 = MD5( "Mufasa:testrealm@host.com:Circle Of Life" )
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// = 939e7578ed9e3c518a452acee763bce9
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//
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// HA2 = MD5( "GET:/dir/index.html" )
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// = 39aff3a2bab6126f332b942af96d3366
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//
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// Response = MD5( "939e7578ed9e3c518a452acee763bce9:\
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// dcd98b7102dd2f0e8b11d0f600bfb0c093:\
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// 00000001:0a4f113b:auth:\
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// 39aff3a2bab6126f332b942af96d3366" )
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// = 6629fae49393a05397450978507c4ef1
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userpass = userpass.split(':');
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var nc = String(++NC);
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nc = NC_PAD.substring(nc.length) + nc;
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var cnonce = crypto.randomBytes(8).toString('hex');
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var ha1 = utility.md5(userpass[0] + ':' + opts.realm + ':' + userpass[1]);
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var ha2 = utility.md5(method.toUpperCase() + ':' + uri);
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var s = ha1 + ':' + opts.nonce;
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if (qop) {
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qop = qop.split(',')[0];
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s += ':' + nc + ':' + cnonce + ':' + qop;
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}
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s += ':' + ha2;
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var response = utility.md5(s);
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var authstring = 'Digest username="' + userpass[0] + '", realm="' + opts.realm
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+ '", nonce="' + opts.nonce + '", uri="' + uri
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+ '", response="' + response + '"';
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if (opts.opaque) {
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authstring += ', opaque="' + opts.opaque + '"';
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}
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if (qop) {
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authstring +=', qop=' + qop + ', nc=' + nc + ', cnonce="' + cnonce + '"';
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}
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return authstring;
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}
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module.exports = digestAuthHeader;
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