saml-idp

Introduction

This app provides a simple SAML Identity Provider (IdP) to test SAML 2.0 Service Providers (SPs) with the SAML 2.0 Web Browser SSO Profile or the Single Logout Profile.

This sample is not intended for use with production systems!

Installation

Global Command Line Tool

npm install --global saml-idp

Manual

From inside a local copy of this repo

npm install
# or
npm link

Library

npm install saml-idp

Docker

1. docker-compose build
2. docker-compose up

Simply modify Dockerfile to specify your own parameters.

Generating IdP Signing Certificate

You must generate a self-signed certificate for the IdP.

The private key should be unique to your test IdP and not shared!

You can generate a keypair using the following command (requires openssl in your path):

openssl req -x509 -new -newkey rsa:2048 -nodes -subj '/C=US/ST=California/L=San Francisco/O=JankyCo/CN=Test Identity Provider' -keyout idp-private-key.pem -out idp-public-cert.pem -days 7300

Usage

Library

An IdP server can be started using the exported runServer function. runServer accepts a config object which matches the interface of the saml-idp command.

const {runServer} = require('saml-idp');

runServer({
  acsUrl: `https://foo.okta.com/auth/saml20/assertion-consumer`,
  audience: `https://foo.okta.com/auth/saml20/metadata`,
});

Custom user config (claims)

const {runServer} = require('saml-idp');

runServer({
  acsUrl: `https://foo.okta.com/auth/saml20/assertion-consumer`,
  audience: `https://foo.okta.com/auth/saml20/metadata`,
  config: {
    user: userDefaults,
    // The auth-service requires at least one AttributeStatement in the SAML assertion.
    metadata: [{
      id: 'email',
      optional: false,
      displayName: 'E-Mail Address',
      description: 'The e-mail address of the user',
      multiValue: false
    }, {
      id: "userType",
      optional: true,
      displayName: 'User Type',
      description: 'The type of user',
      options: ['Admin', 'Editor', 'Commenter']
    }],
    user: {
      email: '[e-mail]',
    },
  },
});

Command Line

SSO Profile

saml-idp --acsUrl {POST URL} --audience {audience}

SSO & SLO Profile

saml-idp --acsUrl {POST URL} --sloUrl {POST URL} --audience {audience}

Open http://localhost:7000 in your browser to start an IdP initiated flow to your SP

Example

saml-idp --acsUrl https://foo.okta.com/auth/saml20/example --audience https://www.okta.com/saml2/service-provider/spf5aFRRXFGIMAYXQPNV

Options

The following options can either be passed as --<option> or to runServer in an options object.

Option (* required)	Description	Default
host	IdP Web Server Listender Host	localhost
port	IdP Web Server Listener Port	7000
cert *	IdP Signature PublicKey Certificate	./idp-public-cert.pem
key *	IdP Signature PrivateKey Certificate	./idp-private-key.pem
issuer *	IdP Issuer URI	urn:example:idp
acsUrl *	SP Assertion Consumer URL
sloUrl	SP Single
audience *	SP Audience URI
serviceProviderId	SP Issuer/Entity URI
relayState	Default SAML RelayState
disableRequestAcsUrl	Disables ability for SP AuthnRequest to specify Assertion Consumer URL	false
encryptAssertion	Encrypts assertion with SP Public Key	false
encryptionCert	SP Certificate (pem) for Assertion Encryption
encryptionPublicKey	SP RSA Public Key (pem) for Assertion Encryption (e.g. openssl x509 -pubkey -noout -in sp-cert.pem)
httpsPrivateKey	Web Server TLS/SSL Private Key (pem)
httpsCert	Web Server TLS/SSL Certificate (pem)
https *	Enables HTTPS Listener (requires httpsPrivateKey and httpsCert)	false
configFile *	Path to a SAML attribute config file	saml-idp/config.js
rollSession	Create a new session for every authn request instead of reusing an existing session	false
authnContextClassRef	Authentication Context Class Reference	urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport
authnContextDecl	Authentication Context Declaration (XML FilePath)

IdP SAML Settings

Issuer

The default IdP issuer is urn:example:idp. You can change this with the --iss argument.

Signing Certificate

The signing certificate public key must be specified as a file path or PEM string using the cert argument.

To generate a self-signed certificate for the IdP run

openssl req -x509 -new -newkey rsa:2048 -nodes \
  -subj '/C=US/ST=California/L=San Francisco/O=JankyCo/CN=Test Identity Provider' \
  -keyout idp-private-key.pem \
  -out idp-public-cert.pem -days 7300

The signing certificate private key must be specified as a file path or PEM string using the key argument

Passing key/cert pairs from environment variables

Signing certificate key/cert pairs can also be passed from environment variables.

saml-idp --acsUrl {POST URL} --audience {audience} --cert="$SAML_CERT" --key="$SAML_KEY"

Single Sign-On Service Binding

Both SSO POST and Redirect bindings are available on the same endpoint which by default is http://localhost:7000/saml/sso

Binding	URL
HTTP-Redirect	http://localhost:port/saml/sso
HTTP-POST	http://localhost:port/saml/sso

Single Logout Service Binding

Both SSO POST and Redirect bindings are available on the same endpoint which by default is http://localhost:7000/saml/slo

Binding	URL
HTTP-Redirect	http://localhost:port/saml/slo
HTTP-POST	http://localhost:port/saml/slo

SAML Metadata

IdP SAML metadata is available on http://localhost:port/metadata

Assertion Attributes

The IdP mints the user's profile as a SAML Assertion Attribute Statement using the metadata property in config.js. Profile properties that match a metadata entry id property will be generated as a SAML Attribute with the same name. The IdP UI will automatically render an input for each entry defined via a metadata entry in config.js with a default value from the matching profile property.

Profile Property

{
  "email": "[e-mail]"
}

Metadata Entry

{
  "id": "email",
  "optional": false,
  "displayName": "E-Mail Address",
  "description": "The e-mail address of the user",
  "multiValue": false
}

SAML Assertion Attribute Statement

<saml:Attribute Name="email"><saml:AttributeValue xsi:type="xs:anyType">[e-mail]</saml:AttributeValue>

Default Attributes

The default profile mappings are defined in config.js as:

Profile Property	SAML Attribute Name
userName	Subject NameID
nameIdFormat	Subject NameID Format
nameIdNameQualifier	Subject NameID Name Qualifer
nameIdSPNameQualifier	Subject NameID SP Name Qualifer
nameIdSPProvidedID	Subject NameID SP ProvidedID
firstName	firstName
lastName	lastName
displayName	displayName
email	email
mobilePhone	mobilePhone
groups	groups

SAML attribute mappings currently default to Okta (Inbound SAML)

Custom Attributes

New attributes can be defined at runtime in the IdP UI or statically by modifying the profile and metadata objects in config.js.

1. Add metadata entry for your new attributes. The id property must be the name of the SAML Attribute

   {
     "id": "customAttribute",
     "optional": false,
     "displayName": "Custom Attribute",
     "description": "My custom attribute",
     "multiValue": false
   }
   

2. Optionally add a default profile attribute value that will be used on startup

Assertion Encryption

Encrypted assertions require both a certificate and public key from the target service provider in the PEM format (base64 encoding of .der, .cer, .cert, .crt). You can convert certificate formats with openssl

DER to PEM

openssl x509 -inform der -in to-convert.der -out converted.pem

The following formats or extensions should be convertible to the pem format: .der, .cer, .cert, `.crt

PEM Certificate to Public Key

PEM files that contain the header -----BEGIN CERTIFICATE----- can also be converted to just the public key which is a file with just the -----BEGIN PUBLIC KEY----- header

openssl x509 -pubkey -noout -in cert.pem > pub.key