OpenID Connect Generic
For an overview of the delegated authentication flow, please see this guide.
Support is enabled by including the following dependency in the WAR overlay:
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<dependency>
<groupId>org.apereo.cas</groupId>
<artifactId>cas-server-support-pac4j-oidc</artifactId>
<version>${cas.version}</version>
</dependency>
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implementation "org.apereo.cas:cas-server-support-pac4j-oidc:${project.'cas.version'}"
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dependencyManagement {
imports {
mavenBom "org.apereo.cas:cas-server-support-bom:${project.'cas.version'}"
}
}
dependencies {
implementation "org.apereo.cas:cas-server-support-pac4j-oidc"
}
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dependencies {
/*
The following platform references should be included automatically and are listed here for reference only.
implementation enforcedPlatform("org.apereo.cas:cas-server-support-bom:${project.'cas.version'}")
implementation platform(org.springframework.boot.gradle.plugin.SpringBootPlugin.BOM_COORDINATES)
*/
implementation "org.apereo.cas:cas-server-support-pac4j-oidc"
}
Configuration
The following settings and properties are available from the CAS configuration catalog:
cas.authn.pac4j.oidc[0].generic.discovery-uri=
The discovery endpoint to locate the provide metadata.
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cas.authn.pac4j.oidc[0].generic.id=
The client id. This setting supports the Spring Expression Language.
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cas.authn.pac4j.oidc[0].generic.secret=
The client secret. This setting supports the Spring Expression Language.
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cas.authn.pac4j.oidc[0].generic.allow-unsigned-id-tokens=
Whether unsigned id tokens issued as plain JWTs are accepted.
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cas.authn.pac4j.oidc[0].generic.auto-redirect-type=NONE
Auto-redirect to this client. Available values are as follows:
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cas.authn.pac4j.oidc[0].generic.callback-url=
Callback URL to use to return the flow back to the CAS server one the identity provider is successfully done. This may be used at the discretion of the client and its type to build service parameters, redirect URIs, etc. If none is specified, the CAS server's login endpoint will be used as the basis of the final callback url.
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cas.authn.pac4j.oidc[0].generic.callback-url-type=QUERY_PARAMETER
Determine how the callback url should be resolved.
Default is
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cas.authn.pac4j.oidc[0].generic.client-authentication-method=
The preferred client authentication method that will be chosen for token requests. If none is specified, one will be chosen somewhat randomly based on what the OIDC OP supports.
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cas.authn.pac4j.oidc[0].generic.client-name=
Name of the client mostly for UI purposes and uniqueness. This name, with 'non-word' characters converted to '-' (e.g. "This Org (New)" becomes "This-Org--New-") is added to the "class" attribute of the redirect link on the login page, to allow for custom styling of individual IdPs (e.g. for an organization logo).
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cas.authn.pac4j.oidc[0].generic.connect-timeout=
Read timeout of the OIDC client. This settings supports the
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cas.authn.pac4j.oidc[0].generic.css-class=
CSS class that should be assigned to this client.
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cas.authn.pac4j.oidc[0].generic.custom-params=
Custom parameters to send along in authZ requests, etc.
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cas.authn.pac4j.oidc[0].generic.disable-pkce=
Disable PKCE support for the provider.
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cas.authn.pac4j.oidc[0].generic.display-name=
Indicate the title or display name of the client for decoration and client presentation purposes. If left blank, the client original name would be used by default.
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cas.authn.pac4j.oidc[0].generic.enabled=true
Whether the client/external identity provider should be considered active and enabled for integration purposes.
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cas.authn.pac4j.oidc[0].generic.expire-session-with-token=
Checks if sessions expire with token expiration.
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cas.authn.pac4j.oidc[0].generic.include-access-token-claims=
If enabled, try to process the access token as a JWT and include its claims in the profile. Only enable this if there is an agreement between the IdP and CAS about the format of the access token. If not, the token format could change at any time.
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cas.authn.pac4j.oidc[0].generic.logout-url=
Logout url used for this provider.
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cas.authn.pac4j.oidc[0].generic.mapped-claims=
List arbitrary mappings of claims when fetching user profiles.
Uses a "directed list" where the allowed
syntax would be
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cas.authn.pac4j.oidc[0].generic.max-clock-skew=
Clock skew in order to account for drift, when validating id tokens. This settings supports the
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cas.authn.pac4j.oidc[0].generic.preferred-jws-algorithm=
The JWS algorithm to use forcefully when validating ID tokens. If none is defined, the first algorithm from metadata will be used.
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cas.authn.pac4j.oidc[0].generic.principal-id-attribute=
The attribute found in the identity provider response that may be used to establish the authenticated user and build a profile for CAS.
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cas.authn.pac4j.oidc[0].generic.read-timeout=
Connect timeout of the OIDC client. This settings supports the
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cas.authn.pac4j.oidc[0].generic.response-mode=
The response mode specifies how the result of the authorization request is formatted. For backward compatibility the default value is empty, which means the default pac4j (empty) response mode is used. Possible values includes "query", "fragment", "form_post", or "web_message"
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cas.authn.pac4j.oidc[0].generic.response-type=
The response type tells the authorization server which grant to execute. For backward compatibility the default value is empty, which means the default pac4j ("code") response type is used. Possibles values includes "code", "token" or "id_token".
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cas.authn.pac4j.oidc[0].generic.scope=
Requested scope(s). This setting supports the Spring Expression Language.
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cas.authn.pac4j.oidc[0].generic.supported-client-authentication-methods=
Control the list of supported client authentication methods
that can be accepted and understood by this integration.
Multiple methods may be specified and separated via a comma.
Example might be
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cas.authn.pac4j.oidc[0].generic.token-expiration-advance=
Default time period advance (in seconds) for considering an access token expired. This settings supports the
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cas.authn.pac4j.oidc[0].generic.use-nonce=
Whether an initial nonce should be to used initially for replay attack mitigation.
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cas.authn.pac4j.oidc[0].generic.validate-logout-token=
Controls whether the logout token submitted as a JWT should be validated for the correct signature, etc.
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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.
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.
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.
Per Service Customizations
Th configuration for the external OpenID Connect identity provider is typically done at build time via CAS configuration settings and applies to all applications and relying parties. You may override certain aspects this configuration on a per application basis by assigning dedicated properties to the service definition.
The following properties are available and recognized by CAS for various modules and features:
Name | Default Value | Type | Group |
---|---|---|---|
forceAuthn
|
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BOOLEAN
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DELEGATED_AUTHN
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passiveAuthn
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BOOLEAN
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DELEGATED_AUTHN
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max_age
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INTEGER
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DELEGATED_AUTHN_OIDC
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scope
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STRING
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DELEGATED_AUTHN_OIDC
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response_type
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STRING
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DELEGATED_AUTHN_OIDC
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response_mode
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STRING
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DELEGATED_AUTHN_OIDC
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A sample JSON file follows:
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{
"@class" : "org.apereo.cas.services.CasRegisteredService",
"serviceId" : "^https://app.example.org",
"name" : "Example",
"id" : 1,
"properties" : {
"@class" : "java.util.HashMap",
"max_age" : {
"@class" : "org.apereo.cas.services.DefaultRegisteredServiceProperty",
"values" : [ "java.util.HashSet", [ "1000" ] ]
},
"scope" : {
"@class" : "org.apereo.cas.services.DefaultRegisteredServiceProperty",
"values" : [ "java.util.HashSet", [ "openid profile" ] ]
}
}
}
See registered service properties for more details.