WORKERS AHEAD!

You are viewing the development documentation for the Apereo CAS server. The functionality presented here is not officially released yet. This is a work in progress and will be continually updated as development moves forward. You are most encouraged to test the changes presented.

Claims - OpenID Connect Authentication

OpenID connect claims are treated as normal CAS attributes that need to be resolved, mapped and released.

The following settings and properties are available from the CAS configuration catalog:

_{The configuration settings listed below are tagged as Required in the CAS configuration metadata. This flag indicates that the presence of the setting may be needed to activate or affect the behavior of the CAS feature and generally should be reviewed, possibly owned and adjusted. If the setting is assigned a default value, you do not need to strictly put the setting in your copy of the configuration, but should review it nonetheless to make sure it matches your deployment expectations.}

cas.authn.oidc.core.issuer=http://localhost:8080/cas/oidc

OIDC issuer. All OpenID Connect servers such as CAS are uniquely identified by a URL known as the issuer. This URL serves as the prefix of a service discovery endpoint as specified in the OpenID Connect Discovery standard.

This URL must be using the https scheme with no query or fragment component that the identity provider (CAS) asserts as its Issuer Identifier. This also MUST be identical to the iss claim value in ID Tokens issued from this issuer, unless overridden in very special circumstances as a last resort.

CAS primarily supports a single issuer per deployment/host.

org.apereo.cas.configuration.model.support.oidc.OidcCoreProperties.

_{How can I configure this property?}

Configuration properties can be included and activated using the following strategies.

Note

When possible, properties should be stored in lower-case kebab format, such as cas.property-name=value. The only possible exception to this rule is when naming actuator endpoints; The name of the actuator endpoints (i.e. ssoSessions) MUST remain in camelCase mode.

CAS properties can be specified using the Java configuration property syntax in any and all .properties files:

cas.authn.oidc.core.issuer=http://localhost:8080/cas/oidc

This is the most common form of property configuration that is recognized by CAS, regardless of the actual property source, which might in fact be managed separately outside the CAS environment, by another system or cloud framework.

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    oidc: 
      core: 
        issuer: "http://localhost:8080/cas/oidc"

Note that YAML is very specific about structure and indentation. Be sure to verify the correctness of the final result with your YAML validator of choice.

CAS properties can be passed to the CAS web application as system properties, when the application is launched:

java -Dcas.authn.oidc.core.issuer="http://localhost:8080/cas/oidc" -jar build/libs/cas.war

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory. Note the placement of the system property which must be specified before the CAS web application is launched.

CAS properties can specified as system environment variables before the CAS web application is launched:

export CAS_AUTHN_OIDC_CORE_ISSUER="http://localhost:8080/cas/oidc"

java -jar build/libs/cas.war

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

CAS properties can be passed to the CAS web application as command-line arguments, when the application is launched:

java -jar build/libs/cas.war --cas.authn.oidc.core.issuer="http://localhost:8080/cas/oidc"

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

_{The configuration settings listed below are tagged as Optional in the CAS configuration metadata. This
flag indicates that the presence of the setting
is not immediately necessary in the end-user CAS configuration, because a default value is assigned or
the activation of the feature is not conditionally controlled by the setting value. In other words, you should only include this field in your
configuration if you need to modify the default value or if you need to turn on the feature controlled by the setting.}

cas.authn.oidc.core.accepted-issuers-pattern=a^

Defines the regular expression pattern that is matched against the calculated issuer from the request. If the issuer that is extracted from the request does not match the #issuer defined in the CAS configuration, this pattern acts as a secondary level rule to allow incoming requests to pass through if the match is successful. By default, the pattern is designed to never match anything.

This settings supports regular expression patterns. ^[?].

org.apereo.cas.configuration.model.support.oidc.OidcCoreProperties.

_{How can I configure this property?}

Configuration properties can be included and activated using the following strategies.

Note

CAS properties can be specified using the Java configuration property syntax in any and all .properties files:

cas.authn.oidc.core.accepted-issuers-pattern=a^

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    oidc: 
      core: 
        accepted-issuers-pattern: "a^"

Note that YAML is very specific about structure and indentation. Be sure to verify the correctness of the final result with your YAML validator of choice.

CAS properties can be passed to the CAS web application as system properties, when the application is launched:

java -Dcas.authn.oidc.core.accepted-issuers-pattern="a^" -jar build/libs/cas.war

CAS properties can specified as system environment variables before the CAS web application is launched:

export CAS_AUTHN_OIDC_CORE_ACCEPTED_ISSUERS_PATTERN="a^"

java -jar build/libs/cas.war

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

CAS properties can be passed to the CAS web application as command-line arguments, when the application is launched:

java -jar build/libs/cas.war --cas.authn.oidc.core.accepted-issuers-pattern="a^"

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

cas.authn.oidc.core.authentication-context-reference-mappings=

A mapping of authentication context refs (ACR) values. This is where specific authentication context classes are referenced and mapped to providers that CAS may support mainly for MFA purposes.

Example might be acr-value->mfa-duo.

Support for authentication context class references is implemented in form of acr_values as part of the original authorization request, which is mostly taken into account by the multifactor authentication features of CAS. Once successful, acr and amr values are passed back to the relying party as part of the id token.

org.apereo.cas.configuration.model.support.oidc.OidcCoreProperties.

_{How can I configure this property?}

Configuration properties can be included and activated using the following strategies.

Note

CAS properties can be specified using the Java configuration property syntax in any and all .properties files:

cas.authn.oidc.core.authentication-context-reference-mappings=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    oidc: 
      core: 
        authentication-context-reference-mappings: "..."

Note that YAML is very specific about structure and indentation. Be sure to verify the correctness of the final result with your YAML validator of choice.

CAS properties can be passed to the CAS web application as system properties, when the application is launched:

java -Dcas.authn.oidc.core.authentication-context-reference-mappings="..." -jar build/libs/cas.war

CAS properties can specified as system environment variables before the CAS web application is launched:

export CAS_AUTHN_OIDC_CORE_AUTHENTICATION_CONTEXT_REFERENCE_MAPPINGS="..."

java -jar build/libs/cas.war

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

CAS properties can be passed to the CAS web application as command-line arguments, when the application is launched:

java -jar build/libs/cas.war --cas.authn.oidc.core.authentication-context-reference-mappings="..."

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

cas.authn.oidc.core.claims-map=

Map fixed claims to CAS attributes. Key is the existing claim name for a scope and value is the new attribute that should take its place and value. Claims associated with a scope (i.e. given_name for profile) are fixed in the OpenID specification. In the event that custom arbitrary attributes should be mapped to claims, mappings can be defined in CAS settings to link a CAS-defined attribute to a fixed given scope. For instance, CAS configuration may allow the value of the attribute sys_given_name to be mapped and assigned to the claim given_name without having an impact on the attribute resolution configuration and all other CAS-enabled applications. If mapping is not defined, by default CAS attributes are expected to match claim names.

org.apereo.cas.configuration.model.support.oidc.OidcCoreProperties.

_{How can I configure this property?}

Configuration properties can be included and activated using the following strategies.

Note

CAS properties can be specified using the Java configuration property syntax in any and all .properties files:

cas.authn.oidc.core.claims-map=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    oidc: 
      core: 
        claims-map: "..."

Note that YAML is very specific about structure and indentation. Be sure to verify the correctness of the final result with your YAML validator of choice.

CAS properties can be passed to the CAS web application as system properties, when the application is launched:

java -Dcas.authn.oidc.core.claims-map="..." -jar build/libs/cas.war

CAS properties can specified as system environment variables before the CAS web application is launched:

export CAS_AUTHN_OIDC_CORE_CLAIMS_MAP="..."

java -jar build/libs/cas.war

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

CAS properties can be passed to the CAS web application as command-line arguments, when the application is launched:

java -jar build/libs/cas.war --cas.authn.oidc.core.claims-map="..."

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

cas.authn.oidc.core.skew=PT5M

Skew value used to massage the authentication issue instance.

This settings supports the java.time.Duration syntax ^[?].

org.apereo.cas.configuration.model.support.oidc.OidcCoreProperties.

_{How can I configure this property?}

Configuration properties can be included and activated using the following strategies.

Note

CAS properties can be specified using the Java configuration property syntax in any and all .properties files:

cas.authn.oidc.core.skew=PT5M

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    oidc: 
      core: 
        skew: "PT5M"

Note that YAML is very specific about structure and indentation. Be sure to verify the correctness of the final result with your YAML validator of choice.

CAS properties can be passed to the CAS web application as system properties, when the application is launched:

java -Dcas.authn.oidc.core.skew="PT5M" -jar build/libs/cas.war

CAS properties can specified as system environment variables before the CAS web application is launched:

export CAS_AUTHN_OIDC_CORE_SKEW="PT5M"

java -jar build/libs/cas.war

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

CAS properties can be passed to the CAS web application as command-line arguments, when the application is launched:

java -jar build/libs/cas.war --cas.authn.oidc.core.skew="PT5M"

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

cas.authn.oidc.core.user-defined-scopes=

Mapping of user-defined scopes. Key is the new scope name and value is a comma-separated list of claims mapped to the scope. Such user-defined scopes are also able to override the definition of system scopes. User-defined scopes as well as any and all custom claims that are mapped to the scope must also be defined as scopes and claims supported by CAS in OpenID Connect discovery.

org.apereo.cas.configuration.model.support.oidc.OidcCoreProperties.

_{How can I configure this property?}

Configuration properties can be included and activated using the following strategies.

Note

CAS properties can be specified using the Java configuration property syntax in any and all .properties files:

cas.authn.oidc.core.user-defined-scopes=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    oidc: 
      core: 
        user-defined-scopes: "..."

Note that YAML is very specific about structure and indentation. Be sure to verify the correctness of the final result with your YAML validator of choice.

CAS properties can be passed to the CAS web application as system properties, when the application is launched:

java -Dcas.authn.oidc.core.user-defined-scopes="..." -jar build/libs/cas.war

CAS properties can specified as system environment variables before the CAS web application is launched:

export CAS_AUTHN_OIDC_CORE_USER_DEFINED_SCOPES="..."

java -jar build/libs/cas.war

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

CAS properties can be passed to the CAS web application as command-line arguments, when the application is launched:

java -jar build/libs/cas.war --cas.authn.oidc.core.user-defined-scopes="..."

The above example assumes that the CAS web application is packaged as cas.war with an embedded server container and can be found in the build/libs directory.

Configuration Metadata

The collection of configuration properties listed in this section are automatically generated from the CAS source and components that contain the actual field definitions, types, descriptions, modules, etc. This metadata may not always be 100% accurate, or could be lacking details and sufficient explanations.

Be Selective

This section is meant as a guide only. Do NOT copy/paste the entire collection of settings into your CAS configuration; rather pick only the properties that you need. Do NOT enable settings unless you are certain of their purpose and do NOT copy settings into your configuration only to keep them as reference. All these ideas lead to upgrade headaches, maintenance nightmares and premature aging.

YAGNI

Note that for nearly ALL use cases, declaring and configuring properties listed here is sufficient. You should NOT have to explicitly massage a CAS XML/Java/etc configuration file to design an authentication handler, create attribute release policies, etc. CAS at runtime will auto-configure all required changes for you. If you are unsure about the meaning of a given CAS setting, do NOT turn it on without hesitation. Review the codebase or better yet, ask questions to clarify the intended behavior.

Naming Convention

Property names can be specified in very relaxed terms. For instance cas.someProperty, cas.some-property, cas.some_property are all valid names. While all forms are accepted by CAS, there are certain components (in CAS and other frameworks used) whose activation at runtime is conditional on a property value, where this property is required to have been specified in CAS configuration using kebab case. This is both true for properties that are owned by CAS as well as those that might be presented to the system via an external library or framework such as Spring Boot, etc.

Note

Settings and properties that are controlled by the CAS platform directly always begin with the prefix cas. All other settings are controlled and provided to CAS via other underlying frameworks and may have their own schemas and syntax. BE CAREFUL with the distinction. Unrecognized properties are rejected by CAS and/or frameworks upon which CAS depends. This means if you somehow misspell a property definition or fail to adhere to the dot-notation syntax and such, your setting is entirely refused by CAS and likely the feature it controls will never be activated in the way you intend.

Validation

Configuration properties are automatically validated on CAS startup to report issues with configuration binding, specially if defined CAS settings cannot be recognized or validated by the configuration schema. Additional validation processes are also handled via Configuration Metadata and property migrations applied automatically on startup by Spring Boot and family.

Indexed Settings

CAS settings able to accept multiple values are typically documented with an index, such as cas.some.setting[0]=value. The index [0] is meant to be incremented by the adopter to allow for distinct multiple configuration blocks.

Scope-based Claims

Please see this guide.

Mapping Claims

Please see this guide.

Releasing Claims

Please see this guide.

Pairwise Identifiers

Please see this guide.

Subject Identifier Claim

Please see this guide.