2022-02-21 14:31:47 +00:00
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import { User } from '../types';
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import xmlbuilder from 'xmlbuilder';
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2022-02-21 15:36:25 +00:00
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import crypto, { sign } from 'crypto';
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import { SignedXml, FileKeyInfo } from 'xml-crypto';
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import { fetchPrivateKey, fetchPublicKey, stripCertHeaderAndFooter } from './certificate';
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2022-02-21 14:31:47 +00:00
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2022-02-21 15:36:25 +00:00
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const createResponseXML = async (params: {
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2022-02-21 14:31:47 +00:00
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idpIdentityId: string,
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audience: string,
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acsUrl: string,
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user: User
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}): Promise<string> => {
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const {idpIdentityId, audience, acsUrl, user} = params;
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const authDate = new Date();
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const authTimestamp = authDate.toISOString();
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authDate.setMinutes(authDate.getMinutes() - 5);
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const notBefore = authDate.toISOString();
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authDate.setMinutes(authDate.getMinutes() + 10);
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const notAfter = authDate.toISOString();
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const inResponseTo = '_1234'
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const responseId = crypto.randomBytes(10).toString('hex');
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const attributeStatement = {
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'@xmlns:xs': 'http://www.w3.org/2001/XMLSchema',
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'@xmlns:xsi': 'http://www.w3.org/2001/XMLSchema-instance',
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'saml:Attribute' : [
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{
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'@Name': 'id',
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'@NameFormat': 'urn:oasis:names:tc:SAML:2.0:attrname-format:basic',
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'saml:AttributeValue': {
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'#text': user.id,
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}
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},
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{
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'@Name': 'email',
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'@NameFormat': 'urn:oasis:names:tc:SAML:2.0:attrname-format:basic',
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'saml:AttributeValue': {
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'#text': user.email,
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}
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},
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{
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'@Name': 'firstName',
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'@NameFormat': 'urn:oasis:names:tc:SAML:2.0:attrname-format:basic',
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'saml:AttributeValue': {
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'#text': user.firstName,
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}
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},
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{
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'@Name': 'lastName',
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'@NameFormat': 'urn:oasis:names:tc:SAML:2.0:attrname-format:basic',
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'saml:AttributeValue': {
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'#text': user.lastName,
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}
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},
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]
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}
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const nodes = {
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'samlp:Response':{
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'@xmlns:samlp': 'urn:oasis:names:tc:SAML:2.0:protocol',
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'@Version': '2.0',
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'@ID': responseId,
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'@Destination': acsUrl,
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'@InResponseTo': inResponseTo,
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'@IssueInstant': authTimestamp,
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'saml:Issuer': {
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'@xmlns:saml': 'urn:oasis:names:tc:SAML:2.0:assertion',
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'#text': idpIdentityId,
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},
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'samlp:Status': {
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'samlp:StatusCode': {
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'@Value': 'urn:oasis:names:tc:SAML:2.0:status:Success'
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}
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},
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'saml:Assertion': {
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'@xmlns:saml': 'urn:oasis:names:tc:SAML:2.0:assertion',
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'@Version': '2.0',
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'@ID': responseId,
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'@IssueInstant': authTimestamp,
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'saml:Issuer': {
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'#text': idpIdentityId,
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},
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'saml:Subject': {
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'saml:NameID': {
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'@Format': 'urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified',
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'#text': user.email,
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}
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},
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'saml:Conditions': {
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'@NotBefore': notBefore,
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'@NotOnOrAfter': notAfter,
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'saml:AudienceRestriction': {
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'saml:Audience': {
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'#text': audience,
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}
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}
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},
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'saml:AuthnStatement': {
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'@AuthnInstant': authTimestamp,
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'@SessionIndex': '_YIlFoNFzLMDYxdwf-T_BuimfkGa5qhKg',
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'saml:AuthnContext': {
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'saml:AuthnContextClassRef': {
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'#text': 'urn:oasis:names:tc:SAML:2.0:ac:classes:unspecified'
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}
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}
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},
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'saml:AttributeStatement': attributeStatement,
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},
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}
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}
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return xmlbuilder.create(nodes).end({ pretty: true});
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};
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// Create the HTML form to submit the response
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const createResponseForm = (relayState: string, encodedSamlResponse: string, acsUrl: string) => {
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const formElements = [
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'<!DOCTYPE html>',
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'<html>',
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'<head>',
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'<meta charset="utf-8">',
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'<meta http-equiv="x-ua-compatible" content="ie=edge">',
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'</head>',
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'<body onload="document.forms[0].submit()">',
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'<noscript>',
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'<p>Note: Since your browser does not support JavaScript, you must press the Continue button once to proceed.</p>',
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'</noscript>',
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'<form method="post" action="' + encodeURI(acsUrl) + '">',
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'<input type="hidden" name="RelayState" value="' + relayState + '"/>',
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'<input type="hidden" name="SAMLResponse" value="' + encodedSamlResponse + '"/>',
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'<input type="submit" value="Continue" />',
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'</form>',
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'<script>document.forms[0].style.display="none";</script>',
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'</body>',
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'</html>',
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];
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return formElements.join('');
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};
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const signResponseXML = async (xml: string, signingKey: any, publicKey: any): Promise<string> => {
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2022-02-21 15:36:25 +00:00
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const sig = new SignedXml();
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const responseXPath = '/*[local-name(.)="Response" and namespace-uri(.)="urn:oasis:names:tc:SAML:2.0:protocol"]';
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const issuerXPath = '/*[local-name(.)="Issuer" and namespace-uri(.)="urn:oasis:names:tc:SAML:2.0:assertion"]';
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2022-02-21 14:31:47 +00:00
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2022-02-21 15:36:25 +00:00
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console.log({publicKey, signingKey})
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2022-02-21 14:31:47 +00:00
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2022-02-21 15:36:25 +00:00
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sig.signatureAlgorithm = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256';
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sig.keyInfoProvider = new FileKeyInfo(stripCertHeaderAndFooter(publicKey));
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sig.signingKey = signingKey;
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2022-02-21 14:31:47 +00:00
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2022-02-21 15:36:25 +00:00
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sig.addReference(responseXPath, ['http://www.w3.org/2000/09/xmldsig#enveloped-signature', 'http://www.w3.org/2001/10/xml-exc-c14n#'], 'http://www.w3.org/2001/04/xmlenc#sha256');
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sig.computeSignature(xml, {
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location: { reference: responseXPath + issuerXPath, action: 'after' },
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});
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return sig.getSignedXml();
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2022-02-21 14:31:47 +00:00
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}
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export {
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2022-02-21 15:36:25 +00:00
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createResponseXML,
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2022-02-21 14:31:47 +00:00
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createResponseForm,
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signResponseXML
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}
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