Simple SAML Identity Provider (IdP) for Node
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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!


Global Command Line Tool

npm install --global saml-idp


From inside a local copy of this repo

npm install
# or
npm link


npm install saml-idp


  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



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');

  acsUrl: ``,
  audience: ``,

Custom user config (claims)

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

  acsUrl: ``,
  audience: ``,
  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: '',

Command Line

SSO Profile

saml-idp --acs {POST URL} --aud {audience}

SSO & SLO Profile

saml-idp --acs {POST URL} --slo {POST URL} --aud {audience}

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


saml-idp --acs --aud


Most parameters can be defined with the following command-line arguments:

  --help                            Show help                                                                                                                              [boolean]
  --version                         Show version number                                                                                                                    [boolean]
  --settings                        Path to JSON config file
  --port, -p                        IdP Web Server Listener Port                                                                                          [required] [default: 7000]
  --cert                            IdP Signature PublicKey Certificate                                                                [required] [default: "./idp-public-cert.pem"]
  --key                             IdP Signature PrivateKey Certificate                                                               [required] [default: "./idp-private-key.pem"]
  --issuer, --iss                   IdP Issuer URI                                                                                           [required] [default: "urn:example:idp"]
  --acsUrl, --acs                   SP Assertion Consumer URL                                                                                                             [required]
  --sloUrl, --slo                   SP Single Logout URL
  --audience, --aud                 SP Audience URI                                                                                                                       [required]
  --serviceProviderId, --spId       SP Issuer/Entity URI                                                                                                                    [string]
  --relayState, --rs                Default SAML RelayState for SAMLResponse
  --disableRequestAcsUrl, --static  Disables ability for SP AuthnRequest to specify Assertion Consumer URL                                                [boolean] [default: false]
  --encryptAssertion, --enc         Encrypts assertion with SP Public Key                                                                                 [boolean] [default: false]
  --encryptionCert, --encCert       SP Certificate (pem) for Assertion Encryption                                                                                           [string]
  --encryptionPublicKey, --encKey   SP RSA Public Key (pem) for Assertion Encryption (e.g. openssl x509 -pubkey -noout -in sp-cert.pem)                                     [string]
  --httpsPrivateKey                 Web Server TLS/SSL Private Key (pem)                                                                                                    [string]
  --httpsCert                       Web Server TLS/SSL Certificate (pem)                                                                                                    [string]
  --https                           Enables HTTPS Listener (requires httpsPrivateKey and httpsCert)                                            [boolean] [required] [default: false]
  --configFile, --conf              Path to a SAML attribute config file                                                  [required] [default: "/Users/karl/src/saml-idp/config.js"]
  --rollSession                     Create a new session for every authn request instead of reusing an existing session                                   [boolean] [default: false]
  --authnContextClassRef, --acr     Authentication Context Class Reference                   [string] [default: "urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport"]
  --authnContextDecl, --acd         Authentication Context Declaration (XML FilePath)                                                                                       [string]

IdP SAML Settings


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

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 --acs {POST URL} --aud {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": ""

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"></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


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