X509InternalAuthnConfiguration

Current File(s): authn/authn.properties (V4.1+)
Format: Native Spring, Properties (V4.1+)

Overview

The "authn/X509Internal" login flow leverages any surrounding mechanism you have available for TLS client certificate authentication, provided the standard servlet request attribute ("javax.servlet.request.X509Certificate") is populated. By default, this flow is configured without support for advanced authentication controls like passive or forced authentication since this is not generally possible with client certificate authentication.

The difference between this flow and the X509 flow is that this flow doesn't redirect to a protected path; rather, the path of the requested profile flow has to be protected, which typically will trigger as soon as the client makes its first request. This is primarily suited to non-browser clients or other scenarios in which authentication is uniformly certificate-based.

The main disadvantage of using this flow for browser use cases is that it will perform the request for authentication without having a chance to determine if the request will succeed, which may be undesirable from a usability perspective.

The result of this flow is a Java Subject containing an X500Principal derived from the subject of the certificate, and the certificate is added as a public credential of the Subject. Note that no actual "username" is produced; rather, a suitable post-login Subject Canonicalization flow must be enabled/configured to pull a suitable principal name out of the Subject.

Note that if you have a web server that is configured to perform the certificate evaluation for you and populate a header or variable with the "username" to use based on the certificate, you almost certainly will want to use the RemoteUser or RemoteUserInternal flow. This flow pulls in the certificate as the primary result of the authentication and relies on downstream logic (often the x500 subject canonicalization flow) to get a username out of it.

General Configuration

There is no configuration required, but you may use conf/global.xml to define a Spring bean named shibboleth.authn.X509.TrustEngine as an OpenSAML TrustEngine that should be used to validate the client certificate chain. Of course, it's often simpler and more common to do this validation at the web server itself, although that's less flexible.

An example of a PKIX-based TrustEngine declaration follows. The bean ID is defined to allow the built-in flow to locate it.

1 2 3 4 <bean id="shibboleth.authn.X509.TrustEngine" parent="shibboleth.StaticPKIXTrustEngine" p:certificates="%{idp.home}/credentials/rootca.pem" p:checkNames="false" p:verifyDepth="1" />

Reference

The beans supported by this flow follow:

Bean ID

Type

Default

Description

Bean ID

Type

Default

Description

shibboleth.authn.X509.TrustEngine

TrustEngine<X509Credential>

 

An optional bean for validating the client certificate

shibboleth.authn.X509.resultCachingPredicate

Predicate<ProfileRequestContext>

 

An optional bean that can be defined to control whether to preserve the authentication result in an IdP session

shibboleth.authn.X509.addDefaultPrincipals

Boolean

true

Whether to add the content of the supportedPrincipals property of the underlying flow descriptor to the resulting Subject

The beans supported by this flow follow:

Bean ID

Type

Description

Bean ID

Type

Description

shibboleth.authn.X509.TrustEngine

TrustEngine<X509Credential>

An optional bean for validating the client certificate

shibboleth.authn.X509.resultCachingPredicate

Predicate<ProfileRequestContext>

An optional bean that can be defined to control whether to preserve the authentication result in an IdP session

The properties specific to this flow defined in authn/authn.properties are:

Name

Default

Description

Name

Default

Description

idp.authn.X509Internal.saveCertificateToCredentialSet

true

Whether to save the certificate into the Subject's public credential set. Disable to reduce the size if not relying on the certificate for subject c14n.

The general properties configuring this flow via authn/authn.properties are:

Name

Default

Description

Name

Default

Description

idp.authn.X509Internal.order

1000

Flow priority relative to other enabled login flows (lower is "higher" in priority)

idp.authn.X509Internal.nonBrowserSupported

true

Whether the flow should handle non-browser request profiles (e.g., ECP)

idp.authn.X509Internal.passiveAuthenticationSupported

false

Whether the flow allows for passive authentication

idp.authn.X509Internal.forcedAuthenticationSupported

false

Whether the flow supports forced authentication

idp.authn.X509Internal.proxyRestrictionsEnforced

%{idp.authn.enforceProxyRestrictions:true}

Whether the flow enforces upstream IdP-imposed restrictions on proxying

idp.authn.X509Internal.proxyScopingEnforced

false

Whether the flow considers itself to be proxying, and therefore enforces SP-signaled restrictions on proxying

idp.authn.X509Internal.discoveryRequired

false

Whether to invoke IdP-discovery prior to running flow

idp.authn.X509Internal.lifetime

%{idp.authn.defaultLifetime:PT1H}

Lifetime of results produced by this flow

idp.authn.X509Internal.inactivityTimeout

%{idp.authn.defaultTimeout:PT30M}

Inactivity timeout of results produced by this flow

idp.authn.X509Internal.reuseCondition

shibboleth.Conditions.TRUE

Bean ID of Predicate<ProfileRequestContext> controlling result reuse for SSO

idp.authn.X509Internal.activationCondition

shibboleth.Conditions.TRUE

Bean ID of Predicate<ProfileRequestContext> determining whether flow is usable for request

idp.authn.X509Internal.subjectDecorator

 

Bean ID of BiConsumer<ProfileRequestContext,Subject> for subject customization

idp.authn.X509Internal.supportedPrincipals

(see below)

Comma-delimited list of protocol-specific Principal strings associated with flow

idp.authn.X509Internal.addDefaultPrincipals

true

Whether to auto-attach the preceding set of Principal objects to each Subject produced by this flow

As a non-password based flow, the supportedPrincipals property defaults to the following XML:

1 2 3 4 5 6 7 8 <list> <bean parent="shibboleth.SAML2AuthnContextClassRef" c:classRef="urn:oasis:names:tc:SAML:2.0:ac:classes:X509" /> <bean parent="shibboleth.SAML2AuthnContextClassRef" c:classRef="urn:oasis:names:tc:SAML:2.0:ac:classes:TLSClient" /> <bean parent="shibboleth.SAML1AuthenticationMethod" c:method="urn:ietf:rfc:2246" /> </list>

In property form, this is expressed as (note the trailing commas):

1 2 3 4 idp.authn.X509Internal.supportedPrincipals = \ saml2/urn:oasis:names:tc:SAML:2.0:ac:classes:X509, \ saml2/urn:oasis:names:tc:SAML:2.0:ac:classes:TLSClient, \ saml1/urn:ietf:rfc:2246

To replace the internally defined flow descriptor bean, the following XML is required:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 <util:list id="shibboleth.AvailableAuthenticationFlows"> <bean p:id="authn/X509Internal" parent="shibboleth.AuthenticationFlow" p:order="%{idp.authn.X509Internal.order:1000}" p:nonBrowserSupported="%{idp.authn.X509Internal.nonBrowserSupported:false}" p:passiveAuthenticationSupported="%{idp.authn.X509Internal.passiveAuthenticationSupported:false}" p:forcedAuthenticationSupported="%{idp.authn.X509Internal.forcedAuthenticationSupported:false}" p:proxyRestrictionsEnforced="%{idp.authn.X509Internal.proxyRestrictionsEnforced:%{idp.authn.enforceProxyRestrictions:true}}" p:proxyScopingEnforced="%{idp.authn.X509Internal.proxyScopingEnforced:false}" p:discoveryRequired="%{idp.authn.X509Internal.discoveryRequired:false}" p:lifetime="%{idp.authn.X509Internal.lifetime:%{idp.authn.defaultLifetime:PT1H}}" p:inactivityTimeout="%{idp.authn.X509Internal.inactivityTimeout:%{idp.authn.defaultTimeout:PT30M}}" p:reuseCondition-ref="#{'%{idp.authn.X509Internal.reuseCondition:shibboleth.Conditions.TRUE}'.trim()}" p:activationCondition-ref="#{'%{idp.authn.X509Internal.activationCondition:shibboleth.Conditions.TRUE}'.trim()}" p:subjectDecorator-ref="#{getObject('%{idp.authn.X509Internal.subjectDecorator:}'.trim())}"> <property name="supportedPrincipalsByString"> <bean parent="shibboleth.CommaDelimStringArray" c:_0="#{'%{idp.authn.X509Internal.supportedPrincipals:}'.trim()}" /> </property> </bean> </util:list>

In older versions and upgraded systems, this list is defined in conf/authn/general-authn.xml. In V4.1+, no default version of the list is provided and it may simply be placed in conf/global.xml if needed.