Technical Profile

Version 1.1.0

19 January 2024

Revisions

Versione	Data	Descrizione	Autore
1.0.4	21-10-2021	Translated from the Italian version	Marco Malavolti Barbara Monticini Davide Vaghetti Mario Di Lorenzo
1.0.5	16-02-2022	IDP-FED03 - Removed Privacy Policy examples	Davide Vaghetti
1.0.6	06-09-2022	Added links to IDP-FED05 e SP-FED05 into IDP-MD09 & SP-MD08	Marco Malavolti
1.1.0	19-01-2024	SEC03 - Ban on using references to SAML v1.x deprecated protocol added IDP-MD04, IDP-MD12, IDP-MD13, SP-MD03, SP-MD10, SP-MD11 - Added recommendation on maximum 256 character limit IDP-MD05, SP-MD04 - Added recommendation on the maximum limit of 1024 characters IDP-FED02 - Removed the sample references IDP-MD08 - Removed the sample references IDP-MD15, SP-MD13 - Added the prefix specification "mailto:" SP-MD03, SP-MD04 - Added ServiceName and ServiceDescription checked elements SP-FED01 - Reference to eduPersonScopedAffiliation specific documentation added SP-FED02 - Added reference to the service provider’s Privacy Policy	Marco Malavolti

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Technical Profile for the entities of the IDEM Federation

The Technical Profile defines all the requirements for an entity to be registered in the Italian Identity Federation IDEM GARR AAI.

Definitions

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this specification are to be interpreted as described in [RFC2119].

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Security (SEC) - Identity Provider & Service Provider

The following requirements are related to the SSL certificate used for the HTTPS interface of the service. They are not to be applied to the certificates used by Identity Providers and Service Providers to sign and encrypt the assertions.

SEC01 - SSL robustness level

The SSL certificate used on the HTTPS port of the service MUST report at least a B grade on SSL Labs: https://www.ssllabs.com/ssltest/

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SEC02 - Chain issue

The SSL certificate used on the HTTPS port of the service SHOULD be free of "Chain issues" --- check with SSL Labs: https://www.ssllabs.com/ssltest/

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SEC03 - No SAML v1

The entity metadata MUST contain ONLY SAML 2.x protocol references.

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Identity Provider

Metadata (IDP-MD)

The following requirements are related to the metadata of an Identity Provider (IDP),

IDP-MD01 - validUntil

validUntil, attribute defined in the element <md:EntityDescriptor>, MUST be removed along with its value as it will be replaced by the IDEM Federation.

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IDP-MD02 - entityID

entityID, attribute defined in the element <md:EntityDescriptor>, MUST be a URI with a maximum length of 256 characters.

If the entityID URI is a URL it SHOULD return the entity metadata.

Example:

entityID="https://idp.example.org/idp/shibboleth"

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IDP-MD03 - Scope

<shibmd:Scope>, defined in the element <md:Extension>, MUST contain domain value controlled by the Organisation (verifications will be performed with WHOIS).

Example:

<shibmd:Scope>example.org</shibmd:Scope>

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IDP-MD04 - DisplayName

<mdui:DisplayName>, defined in the element <mdui:UIInfo>, MUST:

• contain the name of the service that will be displayed to the users. WARNING: the name MUST NOT contain either the words "IDEM" or "eduGAIN".
• be available in both Italian and English languages.

It is RECOMMENDED that:

• the maximum limit of 256 characters is not exceed

Example:

<mdui:DisplayName xml:lang="en">Example University</mdui:DisplayName>
<mdui:DisplayName xml:lang="it">Università di Esempio</mdui:DisplayName>

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IDP-MD05 - Description

<mdui:Description>, defined in the element <mdui:UIInfo>, MUST:

• contain a brief description of the service;
• be available in both Italian and English languages.

It is RECOMMENDED that:

• the maximum limit of 1024 characters is not exceed

Example:

<mdui:Description xml:lang="en">Identity provider for Example University user</mdui:Description> 
<mdui:Description xml:lang="it">Identity provider per gli utenti di Università di Esempio</mdui:Description>

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IDP-MD06 - InformationURL

<mdui:InformationURL>, defined in the element <mdui:UIInfo>, MUST:

• contain the URL of the Information page of the service;
• be available in both Italian and English languages.

For the actual content of the page refer to IDP-FED02.

Example:

<mdui:InformationURL xml:lang="en">https://...info page in english...</mdui:InformationURL> 
<mdui:InformationURL xml:lang="it">https://...pagina di informazioni in italiano...</mdui:InformationURL>

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IDP-MD07 - PrivacyStatementURL

<mdui:PrivacyStatementURL>, defined in the element <mdui:UIInfo>, MUST:

• contain the URL of the Privacy Policy of the service;
• be available in both Italian and English languages.

For the actual content of the page refer to IDP-FED03.

Example:

<mdui:PrivacyStatementURL xml:lang="en">https://...privacy policy in english...</mdui:PrivacyStatementURL>  
<mdui:PrivacyStatementURL xml:lang="it">https://...privacy policy in italiano...</mdui:PrivacyStatementURL>

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IDP-MD08 - Logo

<mdui:Logo>, defined in the element <mdui:UIInfo>, MUST:

• contain at least a URL protected by SSL (https://) pointing to the logo of the organisation.

It is RECOMMENDED that:

• the logo is in PNG format on transparent background;
• to publish two logos:
  • 16x16 pixel (or bigger but respecing the same aspect-ratio)
  • 80x60 pixel (or bigger but respecing the same aspect-ratio).

Example:

<mdui:Logo width="16" height="16">https://...favicon_16x16.png...</mdui:Logo>
<mdui:Logo width="80" height="60">https://...logo_80x60.png...</mdui:Logo>

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IDP-MD09 - KeyDescriptor

The metadata of the entity MUST define at least one <md:KeyDescriptor> element with the following requirements:

• with no further attributes or only the attribute use="signing";
• contain an X.509 certificate in PEM format as reported into IDP-FED05.

Example:

<md:KeyDescriptor use="signing">
   <ds:KeyInfo>
      <ds:X509Data>
         <ds:X509Certificate>
         MII[..]
         </ds:X509Certificate>
      </ds:X509Data>
   </ds:KeyInfo>
</md:KeyDescriptor>

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IDP-MD10 - SingleSignOnService

<md:SingleSignOnService> MUST:

• be defined with the attribute Binding='urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect' (required by AuthnRequest);
• be defined with the attribute Binding='urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST' (required by AuthnResponse);
• always contain a Location attribute valued with a URL protected by SSL (https://).

Example:

<SingleSignOnService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://..."/>
<SingleSignOnService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="https://..."/>

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IDP-MD11 - SingleLogoutService

<md:SingleLogoutService> MUST:

• be defined with the attribute Binding='urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect' (required by LogoutRequest);
• always contain a Location attribute valued with a URL protected by SSL (https://).

Example:

<SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="https://..."/>

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IDP-MD12 - OrganizationName

<md:OrganizationName> , defined in the element <md:Organization>, MUST:

• contain the name of the organisation to which the service belongs;
• be available in both Italian and English languages.

It is RECOMMENDED that:

• the maximum limit of 256 characters is not exceed

Example:

<md:OrganizationName xml:lang="en">Example University</md:OrganizationName> 
<md:OrganizationName xml:lang="it">Università di Esempio</md:OrganizationName>

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IDP-MD13 - OrganizationDisplayName

<md:OrganizationDisplayName> , defined in the element <md:Organization>, MUST:

• contain the name of the organisation that will be shown in the user inteface;
• be available in both Italian and English languages.

It is RECOMMENDED that:

• the maximum limit of 256 characters is not exceed

Example:

<md:OrganizationDisplayName xml:lang="en">Example University</md:OrganizationDisplayName>
<md:OrganizationDisplayName xml:lang="it">Università di Esempio</md:OrganizationDisplayName>

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IDP-MD14 - OrganizationURL

<md:OrganizationURL>, defined in the element <md:Organization>, MUST:

• contain the URL of the main site of organisation to which the service belongs;
• be available in both Italian and English languages.

Example:

<md:OrganizationURL xml:lang="en">https://...institutional site in english...</md:OrganizationURL> 
<md:OrganizationURL xml:lang="it">https://...sito istituzionale in italiano...</md:OrganizationURL>

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IDP-MD15 - ContactPerson

The metadata of the entity MUST define at least one <md:ContactPerson> element with the following requirements:

• contain the e-mail address of the technical contact of the service in the mailto: format;
• contain the attribute contactType="technical".

It is RECOMMENDED to use an impersonal e-mail address (for example a mailing-list).

Example:

<ContactPerson contactType="technical">mailto:mailing-list@domain</md:ContactPerson>

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Federation (IDP-FED)

The requirements listed below are dictated by IDEM Federation and are intended for Identity Providers.

IDP-FED01 - Data to be released

An Identity Provider in IDEM MUST be able to release the following information:

1. a unique, persistent identifier, different for each service and transmissible in one of the following forms:
   • within the xml element <NameID> with property Format="urn:oasis:names:tc:SAML:2.0:nameid-format:persistent" if required by a Service Provider in its metadata;
   • as an attribute named eduPersonTargetedID if required by a Service Provider in its metadata within the xml element <md:RequestedAttribute> .
2. the attribute eduPersonScopedAffiliation, which is the affiliation of the user followed by the idp scope.

Example of idp data released to the Service Provider sp.aai-test.garr.it:

affiliation = member@aai-test.garr.it;staff@aai-test.garr.it
persistent = https://garr-idp-test.irccs.garr.it/idp/shibboleth!https://sp.aai-test.garr.it/shibboleth!eYfN....Q1rU=

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IDP-FED02 - Web page for Information to the users

Every Identity Provider MUST publish a web page in Italian and English language containing:

1. a reference/pointer to the user support service (for example: an email address, a web page, a web form, etc)
2. a pointer to the page about the processing of personal data as indicated by <mdui:PrivacyStatementURL> (IDP-MD07)

A Web page for Information to the users MAY include the IDEM Logo and a link to the IDEM Web site:

• IDEM Web site: https://www.idem.garr.it
• IDEM Logo: https://idem.garr.it/en/tutti-i-documenti/idem-archivio/banner-e-loghi

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IDP-FED03 - Web page about the processing of personal data

A Web page about the processing of personal data MUST contains all the information required as per articles 13 and 14 of the Regulation (EU) 2016/679.

As a useful example of document about the processing of personal data, IDEM GARR AAI team has provided a template available in:InformativaDatiPersonaliIdP.

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IDP-FED04 - Login page

Every Identity Provider in IDEM MUST deploy a Login page for users containing:

• a pointer to the url included in the IdP metadata tag <mdui:InformationURL> and whose content abeys the requirement stated in (IDP-MD06)

It is RECOMMENDED for a Login Web page to contain:

• a pointer to the url included in the IdP metadata tag <mdui:PrivacyStatementURL> and whose content abeys the requirement stated in (IDP-MD07)

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IDP-FED05 - Requirements for Certificates used in Metadata

Certificates included in Metadata of the entity MUST obey the following properties:

• long-term validity (expiration in 30 years);
• self-signed;
• be valid, not yet expired;
• exclude the usage of signing algorithms based on deprecated hashing methods MD5 o SHA1
• use a private key of at least 3072 bit

In any case, Private Key MUST NOT be less than 2048 bit.

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Example of Identity Provider Metadata

<md:EntityDescriptor xmlns="urn:oasis:names:tc:SAML:2.0:metadata" xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:shibmd="urn:mace:shibboleth:metadata:1.0" xmlns:mdui="urn:oasis:names:tc:SAML:metadata:ui" entityID="https://idp.example.org/idp/shibboleth">
 <md:IDPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol">
  <md:Extensions>
   <shibmd:Scope regexp="false">example.org</shibmd:Scope>
   <mdui:UIInfo>
    <mdui:DisplayName xml:lang="en">ENG IDP DISPLAYNAME</mdui:DisplayName>
    <mdui:DisplayName xml:lang="it">ITA IDP DISPLAYNAME</mdui:DisplayName>
    <mdui:Description xml:lang="en">ENG IDP DESCRIPTION</mdui:Description>
    <mdui:Description xml:lang="it">ITA IDP DESCRIPTION</mdui:Description>
    <mdui:InformationURL xml:lang="en">HTTPS URL ENG INFO PAGE</mdui:InformationURL>
    <mdui:InformationURL xml:lang="it">HTTPS URL ITA INFO PAGE</mdui:InformationURL>
    <mdui:PrivacyStatementURL xml:lang="en">URL ENG PRIVACY POLICY PAGE</mdui:PrivacyStatementURL>
    <mdui:PrivacyStatementURL xml:lang="it">URL ITA PRIVACY POLICY PAGE</mdui:PrivacyStatementURL>
    <mdui:Logo width="80" height="60">HTTPS URL LOGO</mdui:Logo>
    <mdui:Logo width="16" height="16">HTTPS URL FAVICON</mdui:Logo>
   </mdui:UIInfo>
  </md:Extensions>
  <md:KeyDescriptor use="signing">
   <ds:KeyInfo>
    <ds:X509Data>
     <ds:X509Certificate>
        MII...
     </ds:X509Certificate>
    </ds:X509Data>
   </ds:KeyInfo>
  </md:KeyDescriptor>
  <md:SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="https://idp.example.org/idp/profile/SAML2/Redirect/SLO"/>
  <md:NameIDFormat>urn:oasis:names:tc:SAML:2.0:nameid-format:transient</md:NameIDFormat>
  <md:NameIDFormat>urn:oasis:names:tc:SAML:2.0:nameid-format:persistent</md:NameIDFormat>
  <md:SingleSignOnService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="https://idp.example.org/idp/profile/SAML2/Redirect/SSO"/>
  <md:SingleSignOnService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://idp.example.org/idp/profile/SAML2/POST/SSO"/>
 </md:IDPSSODescriptor>
 <md:Organization>
  <md:OrganizationName xml:lang="it">ITA IDP ORGANIZATION NAME</md:OrganizationName>
  <md:OrganizationName xml:lang="en">ENG IDP ORGANIZATION NAME</md:OrganizationName>
  <md:OrganizationDisplayName xml:lang="it">ITA IDP DISPLAYNAME ORGANIZATION</md:OrganizationDisplayName>
  <md:OrganizationDisplayName xml:lang="en">ENG IDP DISPLAYNAME ORGANIZATION</md:OrganizationDisplayName>
  <md:OrganizationURL xml:lang="it">https://example.org/it</md:OrganizationURL>
  <md:OrganizationURL xml:lang="en">https://example.org/en</md:OrganizationURL>
 </md:Organization>
 <md:ContactPerson contactType="technical">
  <md:GivenName>EXAMPLE CONTACT NAME</md:GivenName>
  <md:SurName>EXAMPLE CONTACT SURNAME</md:SurName>
  <md:EmailAddress>mailto:technical.contact@example.org</md:EmailAddress>
 </md:ContactPerson>
</md:EntityDescriptor>

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Service Provider

Metadata (SP-MD)

The following requirements are related to the metadata of an Service Provider (SP).

SP-MD01 - validUntil

validUntil, attribute defined in the element <md:EntityDescriptor>, MUST be removed along with it's value as it will be replaced by the IDEM Federation.

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SP-MD02 - entityID

entityID, attribute defined in the element <md:EntityDescriptor>, MUST be a URI with a maximum length of 256 characters.

If the entityID URI is a URL it SHOULD return the entity metadata.

Example:

entityID="https://sp.example.org/shibboleth"

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SP-MD03 - DisplayName & ServiceName

<mdui:DisplayName>, defined in the element <mdui:UIInfo>, and <md:ServiceName>, defined in the element <md:AttributeConsumingService> MUST:

• contain the name of the service that will be displayed to the users. WARNING: the name MUST NOT contain either the reserved words "IDEM" or "eduGAIN";
• be available in both Italian and English languages.

It is RECOMMENDED that:

• the maximum limit of 256 characters is not exceed

Example:

<mdui:DisplayName xml:lang="en">Resource provided by Example Organization</mdui:DisplayName>
<mdui:DisplayName xml:lang="it">Risorsa erogata da Organizzazione di Esempio</mdui:DisplayName>

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SP-MD04 - Description & ServiceDescription

<mdui:Description>, defined in the element <mdui:UIInfo>, and <md:ServiceDescription>, defined in the element <md:AttributeConsumingService> MUST:

• contain a bried description of the service;
• be available in both Italian and English languages.

It is RECOMMENDED that:

• the maximum limit of 1024 characters is not exceed

Example:

<mdui:Description xml:lang="en">The resource allow you to ...</mdui:Description> 
<mdui:Description xml:lang="it">La risorsa ti permette di ...</mdui:Description>

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SP-MD05 - InformationURL

<mdui:InformationURL>, defined in the element <mdui:UIInfo>, MUST:

• contain the URL of the Information page of the service;

• be available in both Italian and English languages.

For the actual content of the page refer to SP-FED02.

Example:

<mdui:InformationURL xml:lang="en">https://...info page in english...</mdui:InformationURL> 
<mdui:InformationURL xml:lang="it">https://...informativa in italiano...</mdui:InformationURL>

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SP-MD06 - PrivacyStatementURL

<mdui:PrivacyStatementURL>, defined in the element <mdui:UIInfo>, MUST:

• contain the URL of the Privacy Policy of the service;
• be available in both Italian and English languages.

For the actual content of the page refer to SP-FED03.

Example:

<mdui:PrivacyStatementURL xml:lang="en">https://...privacy policy in english...</mdui:PrivacyStatementURL>  
<mdui:PrivacyStatementURL xml:lang="it">https://...privacy policy in italiano...</mdui:PrivacyStatementURL>

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SP-MD07 - Logo

<mdui:Logo>, defined in the element <mdui:UIInfo>, MUST:

• contain at least a URL protected by SSL (https://) pointing to the logo of the organisation.

It is RECOMMENDED that:

• the logo is in PNG format (on transparent background).

• to publish two logos:
  • 16x16 pixel (or bigger but respecing the same aspect-ratio)
  • 80x60 pixel (or bigger but respecing the same aspect-ratio)

Esempio:

<mdui:Logo width="64" height="64">https://...logo.png</mdui:Logo>

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SP-MD08 - KeyDescriptor

The metadata of the entity MUST define at least one <md:KeyDescriptor> element with the following requirements:

• with no further attributes or only the attribute use="encryption"
• contain an X.509 certificate in PEM format as reported into SP-FED05;

<md:KeyDescriptor use="encryption">
   <ds:KeyInfo> 
      <ds:X509Data> 
         <ds:X509Certificate>
            MII[..]
         </ds:X509Certificate>
      </ds:X509Data>
   </ds:KeyInfo>
</md:KeyDescriptor>

If "Single Logout" is supported by the Service Provider a further <md:KeyDescriptor> element with attribute use="signing" MUST be present.

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SP-MD09 - RequestedAttribute

<md:RequestedAttribute> , defined in the element <md:AttributeConsumingService>, MUST:

• contain the set of SAML attributes required by the resource to work properly
• define attributes that are required to get access to the resourse with the property isRequired="true"
• define attributes that are desired when accessing the resourse with the property isRequired="false"

Example:

<md:RequestedAttribute FriendlyName="givenName" Name="urn:oid:2.5.4.42" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri" isRequired="true"/>
<md:RequestedAttribute FriendlyName="displayName" Name="urn:oid:2.16.840.1.113730.3.1.241" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri" isRequired="false"/>

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SP-MD10 - OrganizationName

<md:OrganizationName> , defined in the element <md:Organization>, MUST:

• contain the name of the organisation to which the service belongs;
• be available in both Italian and English languages.

It is RECOMMENDED that:

• the maximum limit of 256 characters is not exceed

Example:

<md:OrganizationName xml:lang="en">Example Organization</md:OrganizationName> 
<md:OrganizationName xml:lang="it">Organizzazione di Esempio</md:OrganizationName>

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SP-MD11 - OrganizationDisplayName

<md:OrganizationDisplayName> , defined in the element <md:Organization>, MUST:

• contain the name of the organisation that will be shown in the user inteface;
• be available in both Italian and English languages.

It is RECOMMENDED that:

• the maximum limit of 256 characters is not exceed

Example:

<md:OrganizationDisplayName xml:lang="en">Resource provided by Example University</md:OrganizationDisplayName>
<md:OrganizationDisplayName xml:lang="it">Risorsa erogata da Università di Esempio</md:OrganizationDisplayName>

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SP-MD12 - OrganizationURL

<md:OrganizationURL>, defined in the element <md:Organization>, MUST:

• contain the URL of the main site of the Organisation to which the service belongs;
• be available in both Italian and English languages.

Example:

<md:OrganizationURL xml:lang="en">https://...institutional site in english...</md:OrganizationURL> 
<md:OrganizationURL xml:lang="it">https://...sito istituzionalein italiano...</md:OrganizationURL>

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SP-MD13 - ContactPerson

The metadata of the entity MUST define at least one <md:ContactPerson> element with the following requirements:

• contain the e-mail address of the technical contact of the service in the mailto: format;
• contain the attribute contactType="technical".

It is RECOMMENDED to use an impersonal e-mail address (for example a mailing-list).

Example:

<ContactPerson contactType="technical">mailto:mailing-list@domain</md:ContactPerson>

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Federation (SP-FED)

The requirements listed below are dictated by IDEM Federation and are intended for Service Providers.

SP-FED01 - Data received from IdPs

in IDEM every Service Provider receives by default the following data by every Identity Provider:

1. A unique persistent targeted id of the user:
   • persistent-id (persistent NameID) (or the attribute eduPersonTargetedID if the Idp cannot release a NameID)
2. The scoped affiliation of the user:
   • affiliation (eduPersonScopedAffiliation) (take a look to Attributo Affiliazione)

Example of idp data released to sp.aai-test.garr.it:

affiliation = member@aai-test.garr.it;staff@aai-test.garr.it
persistent-id = https://garr-idp-test.irccs.garr.it/idp/shibboleth!https://sp.aai-test.garr.it/shibboleth!eYfN....Q1rU=

Any further attribute required to access a Service Provider has to be properly motivated by sending an e-mail to idem-help@garr.it.

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SP-FED02 - Web page for Information to the users

Every Service Provider MUST publish a web page in Italian and English language containing:

1. the description of the service
2. the intended audience
3. the Name of the Organization providing the service
4. a reference/pointer to the user support service (for example: an email address, a web page, a web form, etc)
5. a reference/pointer to the page about the processing of personal data as indicated by <mdui:PrivacyStatementURL> (SP-MD06), if possible, referenced with the same URL.

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SP-FED03 - Web page about the processing of personal data

A Web page about the processing of personal data MUST contains all the information required as per articles 13 and 14 of the Regulation (EU) 2016/679.

It is strongly suggested to use REFEDS guidelines for Service Provider:

https://wiki.refeds.org/display/CODE/Privacy+policy+guidelines+for+Service+Providers

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SP-FED04 - Login Page / Discovery Service

The access page to a federated resource in IDEM MUST contain:

• the list of eligible IdP coming from IDEM Federation and eduGAIN;
• a reference/pointer to the page about the Information to the users (SP-MD05)

It is strongly suggested to follow REFEDS Best Practices when implementing federated access to a resource: https://discovery.refeds.org/

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SP-FED05 - Requirements for Certificates used in Metadata

Certificates included in Metadata of the entity MUST obey the following requirements:

• long-term validity (expiration in 30 years);
• self-signed;
• be valid, not yet expired;
• exclude the usage of signing algorithms based on deprecated hashing methods MD5 o SHA1
• use a private key of at least 3072 bit

In any case, Private Key MUST NOT be less than 2048 bit.

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Example of Service Provider Metadata

<md:EntityDescriptor entityID="https://sp.example.com/shibboleth"
                     xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
                     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                     xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata"
                     xmlns:mdui="urn:oasis:names:tc:SAML:metadata:ui">
   <md:SPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol">
      <md:Extensions>
         <init:RequestInitiator
            xmlns:init="urn:oasis:names:tc:SAML:profiles:SSO:request-init"
            Binding="urn:oasis:names:tc:SAML:profiles:SSO:request-init"
            Location="https://sp.example.com/Shibboleth.sso/Login" />
         <idpdisc:DiscoveryResponse
            xmlns:idpdisc="urn:oasis:names:tc:SAML:profiles:SSO:idp-discovery-protocol"
            Binding="urn:oasis:names:tc:SAML:profiles:SSO:idp-discovery-protocol"
            Location="https://sp.example.com/Shibboleth.sso/DS" index="1" />
         <mdui:UIInfo>
            <mdui:DisplayName xml:lang="en">ENG DISPLAY NAME</mdui:DisplayName>
            <mdui:DisplayName xml:lang="it">ITA DISPLAY NAME</mdui:DisplayName>
            <mdui:Description xml:lang="en">ENG DESCRIPTION</mdui:Description>
            <mdui:Description xml:lang="it">ITA DESCRIPTION</mdui:Description>
            <mdui:InformationURL xml:lang="en">HTTPS ENG INFORMATION PAGE URL</mdui:InformationURL>
            <mdui:InformationURL xml:lang="it">HTTPS ITA INFORMATION PAGE URL</mdui:InformationURL>
            <mdui:Logo height="64" width="64">HTTPS RESOURCE LOGO PNG</mdui:Logo>
            <mdui:PrivacyStatementURL xml:lang="en">HTTPS ENG PRIVACY POLICY PAGE URL</mdui:PrivacyStatementURL>
            <mdui:PrivacyStatementURL xml:lang="it">HTTPS ITA PRIVACY POLICY PAGE URL</mdui:PrivacyStatementURL>
         </mdui:UIInfo>
      </md:Extensions>
      <md:KeyDescriptor>
         <ds:KeyInfo>
            <ds:X509Data>
               <ds:X509Certificate>
                  MII...
               </ds:X509Certificate>
            </ds:X509Data>
         </ds:KeyInfo>
      </md:KeyDescriptor>
      <md:SingleLogoutService
         Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"
         Location="https://sp.example.com/Shibboleth.sso/SLO/Redirect" />
      <md:SingleLogoutService
         Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
         Location="https://sp.example.com/Shibboleth.sso/SLO/POST" />
      <md:AssertionConsumerService
         Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
         Location="https://sp.example.com/Shibboleth.sso/SAML2/POST"
         index="1" />
      <md:AttributeConsumingService index="1">
         <!-- example for the required attribute: mail -->
         <md:RequestedAttribute FriendlyName="mail"
            Name="urn:oid:0.9.2342.19200300.100.1.3"
            NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
            isRequired="true" />
         <!-- example for the desired attribute: eduPersonPrincipalName -->
         <md:RequestedAttribute FriendlyName="eppn"
            Name="urn:oid:1.3.6.1.4.1.5923.1.1.1.6"
            NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
            isRequired="false" />
      </md:AttributeConsumingService>
   </md:SPSSODescriptor>
   <md:Organization>
      <md:OrganizationName xml:lang="en">ENG ORGANIZATION NAME</md:OrganizationName>
      <md:OrganizationName xml:lang="it">ITA ORGANIZATION NAME</md:OrganizationName>
      <md:OrganizationDisplayName xml:lang="en">ENG ORGANIZATION DISPLAY NAME</md:OrganizationDisplayName>
      <md:OrganizationDisplayName xml:lang="it">ITA ORGANIZATION DISPLAY NAME</md:OrganizationDisplayName>
      <md:OrganizationURL xml:lang="en">ENG ORGANIZATION URL</md:OrganizationURL>
      <md:OrganizationURL xml:lang="it">ITA ORGANIZATION URL</md:OrganizationURL>
   </md:Organization>
   <md:ContactPerson contactType="technical">
      <md:EmailAddress>mailto:technical.contact.mailing.list@example.org</md:EmailAddress>
   </md:ContactPerson> 
</md:EntityDescriptor>

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References:

[RFC 2119] Key words for use in RFCs to Indicate Requirement Levels

http://www.rfc-editor.org/rfc/rfc2119.txt

[IDEM-META] IDEM METADATA PROFILE v1.0

https://wiki.idem.garr.it/w/images/8/81/IDEM_METADATA_PROFILE_V1.1-ita-eng.pdf

[SAML2Core] Assertions and Protocols for the OASIS Security Assertion Markup Language (SAML) V2.0

http://docs.oasis-open.org/security/saml/v2.0/saml-core-2.0-os.pdf

[SAML2Bind] Bindings for the OASIS Security Assertion Markup Language (SAML) V2.0

http://docs.oasis-open.org/security/saml/v2.0/saml-bindings-2.0-os.pdf

[SAML2Meta] Metadata for the OASIS Security Assertion Markup Language (SAML) V2.0

http://docs.oasis-open.org/security/saml/v2.0/saml-metadata-2.0-os.pdf

[SAML2MDIOP] SAML V2.0 Metadata Interoperability Profile Version 1.0

http://docs.oasis-open.org/security/saml/Post2.0/sstc-metadata-iop-os.pdf

[SAML2Int] SAML V2.0 Deployment Profile for Federation Interoperability

https://kantarainitiative.github.io/SAMLprofiles/saml2int.html

[REFEDS-DISCO] REFEDS - Discovery Best Practice

https://wiki.refeds.org/display/FBP/Discovery+Best+Practice

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