The Shibboleth V1 software has reached its End of Life and is no longer supported. This documentation is available for historical purposes only.

KeyNameVerification

Owned by Scott Cantor
Last updated: Jun 16, 2008 by Former user (Deleted)Version comment
2 min read

Key Name Validation

One of the ways Shibboleth can verify that the provider it thinks it's talking to is legitimate is by checking the CN of a presented certificate against metadata. The CN in the certificate must precisely match the metadata for the claimed provider, and the certificate presented must be rooted in a provider that's listed as trusted in the metadata.

To create a keypair and a certificate signing request, use the following two commands. Complete all the fields as appropriate for your CSR. The CN field must be equal to the full domain name of the server, such as www.supervillain.edu , and the others can be completed according to your CA's policy. Once the CSR is complete, it needs to be submitted to a CA for signing. The resulting certificate can be used by the provider.

	openssl genrsa -out myprovider.key 2048
	openssl req -new -key myprovider.key -out myprovider.csr

The corresponding structure in the metadata for this new certificate would be:

	<ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
		<ds:KeyName>idp.supervillain.edu</ds:KeyName>
	</ds:KeyInfo>

One or more trusted roots that signed the certificates used within the federation must then also be added so that the certificates can be verified. This is done by placing an Extensions element within the main EntitiesDescriptor element, but before any EntityDescriptor element, such as:

	<Extensions>
		<shibmd:KeyAuthority xmlns:shibmd="urn:mace:shibboleth:metadata:1.0" VerifyDepth="5">
			<!-- Supervillain CA -->
			<ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
				<ds:X509Data>
					<ds:X509Certificate>
MIIExzCCA6+gAwIBAgIJAM+MlFr0Sth6MA0GCSqGSIb3DQEBBQUAMIGdMR8wHQYD
VQQDExZTdXBlcnZpbGxhaW46IFRoZSBSb290MQswCQYDVQQGEwJVUzERMA8GA1UE
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					</ds:X509Certificate>
				</ds:X509Data>
			</ds:KeyInfo>
		</shibmd:KeyAuthority>
	</Extensions>

The complete simple metadata file would look like:

<EntitiesDescriptor
	 xmlns="urn:oasis:names:tc:SAML:2.0:metadata"
	 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	 xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
	 xmlns:shibmd="urn:mace:shibboleth:metadata:1.0"
	 xsi:schemaLocation="urn:oasis:names:tc:SAML:2.0:metadata ../schemas/saml-schema-metadata-2.0.xsd
	 urn:mace:shibboleth:metadata:1.0 ../schemas/shibboleth-metadata-1.0.xsd
	 http://www.w3.org/2000/09/xmldsig# ../schemas/xmldsig-core-schema.xsd"
	 Name="https://www.supervillain.edu/evil-federation/policy.html"
	 validUntil="2010-01-01T00:00:00Z">

	<!-- This is the metadata for Evil Federation using PKI for trust. -->

	<Extensions>
		<shibmd:KeyAuthority xmlns:shibmd="urn:mace:shibboleth:metadata:1.0" VerifyDepth="5">
			<!-- Supervillain CA -->
			<ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
				<ds:X509Data>
					<ds:X509Certificate>
MIIExzCCA6+gAwIBAgIJAM+MlFr0Sth6MA0GCSqGSIb3DQEBBQUAMIGdMR8wHQYD
VQQDExZTdXBlcnZpbGxhaW46IFRoZSBSb290MQswCQYDVQQGEwJVUzERMA8GA1UE
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ETAPBgNVBAgTCE5ldyBZb3JrMQ8wDQYDVQQHEwZHb3RoYW0xIDAeBgNVBAoTF1N1
cGVydmlsbGFpbiBVbml2ZXJzaXR5MScwJQYJKoZIhvcNAQkBFhhwZW5ndWluQHN1
cGVydmlsbGFpbi5lZHWCCQDPjJRa9ErYejAMBgNVHRMEBTADAQH/MA0GCSqGSIb3
DQEBBQUAA4IBAQC4SPBDGYAxfbXd8N5OvG0drM7a5hjXfcCZpiILlPSRpxp79yh7
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x48VuO6GbWVyxtktkE2ypz1KLWiyI056YynydRvuBCBHeRqGUixPlH9CrmeSCP2S
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uEyb50RJ7DWmXctSC0b3eymZ2lSXxAWNOsNy
					</ds:X509Certificate>
				</ds:X509Data>
			</ds:KeyInfo>
		</shibmd:KeyAuthority>
	</Extensions>

		<!-- The Supervillain IdP -->

	<EntityDescriptor entityID="https://idp.example.org/shibboleth">
		<IDPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:1.1:protocol urn:mace:shibboleth:1.0">
			<Extensions>
				<!-- It's authoritative for supervillain.edu. -->
				<shibmd:Scope>supervillain.edu</shibmd:Scope>
			</Extensions>

			<KeyDescriptor use="signing">
				<ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
					<ds:KeyName>idp.supervillain.edu</ds:KeyName>
				</ds:KeyInfo>
			</KeyDescriptor>
			
			<ArtifactResolutionService index="1"
				Binding="urn:oasis:names:tc:SAML:1.0:bindings:SOAP-binding"
				Location="http://idp.example.org:8080/shibboleth-idp/Artifact"/>

			<NameIDFormat>urn:mace:shibboleth:1.0:nameIdentifier</NameIDFormat>

			<SingleSignOnService Binding="urn:mace:shibboleth:1.0:profiles:AuthnRequest"
				 Location="https://idp.example.org/shibboleth-idp/SSO"/>

		</IDPSSODescriptor>
		
		<AttributeAuthorityDescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:1.1:protocol">
			<Extensions>
				<!-- It's authoritative for supervillain.edu. -->
				<shibmd:Scope>supervillain.edu</shibmd:Scope>
			</Extensions>

			<KeyDescriptor use="signing">
				<ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
					<ds:KeyName>idp.supervillain.edu</ds:KeyName>
				</ds:KeyInfo>
			</KeyDescriptor>
			
			<AttributeService Binding="urn:oasis:names:tc:SAML:1.0:bindings:SOAP-binding"
				 Location="http://idp.example.org:8080/shibboleth-idp/AA"/>

			<NameIDFormat>urn:mace:shibboleth:1.0:nameIdentifier</NameIDFormat>
		</AttributeAuthorityDescriptor>

		<Organization>
			 <OrganizationName xml:lang="en">The Exalted University of Supervillains</OrganizationName>
			 <OrganizationDisplayName xml:lang="en">Supervillain University</OrganizationDisplayName>
			 <OrganizationURL xml:lang="en">http://www.supervillain.edu/</OrganizationURL>
		</Organization>
		<ContactPerson contactType="technical">
			 <SurName>Norman Osborn</SurName>
			 <EmailAddress>greengoblin@supervillain.edu</EmailAddress>
		</ContactPerson>

	</EntityDescriptor>

		<!-- The main Supervillain web server -->

	<EntityDescriptor entityID="https://www.supervillain.edu/shibboleth/evil-federation/sp">
	
		<SPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:1.1:protocol">
			<KeyDescriptor use="signing">
				<ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
					<ds:KeyName>www.supervillain.edu</ds:KeyName>
				</ds:KeyInfo>
			</KeyDescriptor>

			<NameIDFormat>urn:mace:shibboleth:1.0:nameIdentifier</NameIDFormat>

			<AssertionConsumerService index="1" isDefault="true"
				Binding="urn:oasis:names:tc:SAML:1.0:profiles:browser-post"
				Location="https://www.supervillain.edu/Shibboleth.sso/SAML/POST"/>
			<AssertionConsumerService index="2"
				Binding="urn:oasis:names:tc:SAML:1.0:profiles:artifact-01"
				Location="https://www.supervillain.edu/Shibboleth.sso/SAML/Artifact"/>
		</SPSSODescriptor>

		<Organization>
			 <OrganizationName xml:lang="en">The Exalted University of Supervillains</OrganizationName>
			 <OrganizationDisplayName xml:lang="en">Supervillain University</OrganizationDisplayName>
			 <OrganizationURL xml:lang="en">http://www.supervillain.edu/</OrganizationURL>
		</Organization>
		<ContactPerson contactType="technical">
			 <SurName>Erik Magnus Lehnsherr</SurName>
			 <EmailAddress>magneto@supervillain.edu</EmailAddress>
		</ContactPerson>
		
	</EntityDescriptor>

</EntitiesDescriptor>