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IdP remote metadata reference

Table of Contents

This is a reference for metadata options available for metadata/saml20-idp-remote.php and metadata/shib13-idp-remote.php. Both files have the following format:

<?php
/* The index of the array is the entity ID of this IdP. */
$metadata['entity-id-1'] = array(
    /* Configuration options for the first IdP. */
);
$metadata['entity-id-2'] = array(
    /* Configuration options for the second IdP. */
);
/* ... */

1 Common options

The following options are common between both the SAML 2.0 protocol and Shibboleth 1.3 protocol:

authproc
Used to manipulate attributes, and limit access for each IdP. See the authentication processing filter manual.
base64attributes
Whether attributes received from this IdP should be base64 decoded. The default is FALSE.
certData
The base64 encoded certificate for this IdP. This is an alternative to storing the certificate in a file on disk and specifying the filename in the certificate-option.
certFingerprint
If you only need to validate signatures received from this IdP, you can specify the certificate fingerprint instead of storing the full certificate. To obtain this, you can enter a bogus value, and attempt to log in. You will then receive an error message with the correct fingerprint.

It is also possible to add an array of valid fingerprints, where any fingerprints in that array is accepted as valid. This can be used to update the certificate of the IdP without having to update every SP at that exact time. Instead, one can update the SPs with the new fingerprint, and only update the certificate after every SP is updated.

certificate
The file with the certificate for this IdP. The path is relative to the cert-directory.
description
A description of this IdP. Will be used by various modules when they need to show a description of the IdP to the user.

This option can be translated into multiple languages in the same way as the name-option.

icon
A logo which will be shown next to this IdP in the discovery service.
OrganizationName
The name of the organization responsible for this SPP. This name does not need to be suitable for display to end users.

This option can be translated into multiple languages by specifying the value as an array of language-code to translated name:

'OrganizationName' => array(
    'en' => 'Example organization',
    'no' => 'Eksempel organisation',
),

Note: If you specify this option, you must also specify the OrganizationURL option.

OrganizationDisplayName
The name of the organization responsible for this IdP. This name must be suitable for display to end users. If this option isn't specified, OrganizationName will be used instead.

This option can be translated into multiple languages by specifying the value as an array of language-code to translated name.

Note: If you specify this option, you must also specify the OrganizationName option.

OrganizationURL
A URL the end user can access for more information about the organization.

This option can be translated into multiple languages by specifying the value as an array of language-code to translated URL.

Note: If you specify this option, you must also specify the OrganizationName option.

name
The name of this IdP. Will be used by various modules when they need to show a name of the SP to the user.

If this option is unset, the organization name will be used instead (if it is available).

This option can be translated into multiple languages by specifying the value as an array of language-code to translated name:

'name' => array(
    'en' => 'A service',
    'no' => 'En tjeneste',
),
SingleSignOnService
Endpoint URL for sign on. You should obtain this from the IdP. For SAML 2.0, SimpleSAMLphp will use the HTTP-Redirect binding when contacting this endpoint.

The value of this option is specified in one of several endpoint formats.

2 SAML 2.0 options

The following SAML 2.0 options are available:

encryption.blacklisted-algorithms
Blacklisted encryption algorithms. This is an array containing the algorithm identifiers.

Note that this option also exists in the SP configuration. This entry in the IdP-remote metadata overrides the option in the SP configuration.

The RSA encryption algorithm with PKCS#1 v1.5 padding is blacklisted by default for security reasons. Any assertions encrypted with this algorithm will therefore fail to decrypt. You can override this limitation by defining an empty array in this option (or blacklisting any other algorithms not including that one). However, it is strongly discouraged to do so. For your own safety, please include the string 'http://www.w3.org/2001/04/xmlenc#rsa-1_5' if you make use of this option.

hide.from.discovery
Whether to hide hide this IdP from the local discovery or not. Set to true to hide it. Defaults to false.
nameid.encryption
Whether NameIDs sent to this IdP should be encrypted. The default value is FALSE.

Note that this option also exists in the SP configuration. This entry in the IdP-remote metadata overrides the option in the SP configuration.

sign.authnrequest
Whether to sign authentication requests sent to this IdP.

Note that this option also exists in the SP configuration. This value in the IdP remote metadata overrides the value in the SP configuration.

sign.logout
Whether to sign logout messages sent to this IdP.

Note that this option also exists in the SP configuration. This value in the IdP remote metadata overrides the value in the SP configuration.

SingleLogoutService
Endpoint URL for logout requests and responses. You should obtain this from the IdP. Users who log out from your service is redirected to this URL with the LogoutRequest using HTTP-REDIRECT.

The value of this option is specified in one of several endpoint formats.

SingleLogoutServiceResponse
Endpoint URL for logout responses. Overrides the SingleLogoutService-option for responses.
signature.algorithm
The algorithm to use when signing any message sent to this specific identity provider. Defaults to RSA-SHA1.
Note that this option also exists in the SP configuration. This value in the IdP remote metadata overrides the value in the SP configuration.

Possible values:

  • http://www.w3.org/2000/09/xmldsig#rsa-sha1 Note: the use of SHA1 is deprecated and will be disallowed in the future.
  • http://www.w3.org/2001/04/xmldsig-more#rsa-sha256
  • http://www.w3.org/2001/04/xmldsig-more#rsa-sha384
  • http://www.w3.org/2001/04/xmldsig-more#rsa-sha512
SPNameQualifier
This corresponds to the SPNameQualifier in the SAML 2.0 specification. It allows to give subjects a SP specific namespace. This option is rarely used, so if you don't need it, leave it out. When left out, SimpleSAMLphp assumes the entityID of your SP as the SPNameQualifier.
validate.logout
Whether we require signatures on logout messages sent from this IdP.

Note that this option also exists in the SP configuration. This value in the IdP remote metadata overrides the value in the SP configuration.

2.1 Decrypting assertions

It is possible to decrypt the assertions received from an IdP. Currently the only algorithm supported is AES128_CBC or RIJNDAEL_128.

There are two modes of encryption supported by SimpleSAMLphp. One is symmetric encryption, in which case both the SP and the IdP needs to share a key. The other mode is the use of public key encryption. In that mode, the public key of the SP is extracted from the certificate of the SP.

assertion.encryption
Whether assertions received from this IdP must be encrypted. The default value is FALSE. If this option is set to TRUE, assertions from the IdP must be encrypted. Unencrypted assertions will be rejected.

Note that this option overrides the option with the same name in the SP configuration.

sharedkey
Symmetric key which should be used for decryption. This should be a 128-bit key. If this option is not specified, public key encryption will be used instead.

2.2 Fields for signing and validating messages

SimpleSAMLphp only signs authentication responses by default. Signing of authentication request, logout requests and logout responses can be enabled by setting the redirect.sign option. Validation of received messages can be enabled by the redirect.validate option.

redirect.sign
Whether authentication request, logout requests and logout responses sent to this IdP should be signed. The default is FALSE.
redirect.validate
Whether logout requests and logout responses received from this IdP should be validated. The default is FALSE.

Example: Configuration for validating messages

'redirect.validate' => TRUE,
'certificate' => 'example.org.crt',

3 Shibboleth 1.3 options

caFile
Alternative to specifying a certificate. Allows you to specify a file with root certificates, and responses from the service be validated against these certificates. Note that SimpleSAMLphp doesn't support chains with any itermediate certificates between the root and the certificate used to sign the response. Support for PKIX in SimpleSAMLphp is experimental, and we encourage users to not rely on PKIX for validation of signatures; for background information review the SAML 2.0 Metadata Interoperability Profile.
saml1.useartifact
Request that the IdP returns the result to the artifact binding. The default is to use the POST binding, set this option to TRUE to use the artifact binding instead.

This option can be set for all IdPs connected to a SP by setting it in the entry for the SP in config/authsources.php.

Note: This option only works with the saml:SP authentication source.

4 Examples

4.1 Configuration for openidp.feide.no

<?php
$metadata['https://openidp.feide.no'] = array(
    'name'                 => array(
        'en' => 'Feide OpenIdP - guest users',
        'no' => 'Feide Gjestebrukere',
    ),
    'description'          => 'Here you can login with your account on Feide RnD OpenID. If you do not already have an account on this identity provider, you can create a new one by following the create new account link and follow the instructions.',
    'SingleSignOnService'  => 'https://openidp.feide.no/simplesaml/saml2/idp/SSOService.php',
    'SingleLogoutService'  => 'https://openidp.feide.no/simplesaml/saml2/idp/SingleLogoutService.php',
    'certFingerprint'      => 'c9ed4dfb07caf13fc21e0fec1572047eb8a7a4cb',
);

5 Calculating the fingerprint of a certificate

If you have obtained a certificate file, and want to calculate the fingerprint of the file, you can use the openssl command:

$ openssl x509 -noout -fingerprint -in "example.org.crt"
SHA1 Fingerprint=AF:E7:1C:28:EF:74:0B:C8:74:25:BE:13:A2:26:3D:37:97:1D:A1:F9

In this case, the certFingerprint option should be set to AF:E7:1C:28:EF:74:0B:C8:74:25:BE:13:A2:26:3D:37:97:1D:A1:F9.