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.
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 provider 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.private-key-jwt.jwks.location=
Specific JWKS for the private_key_jwt client authentication method. The location of the resource. Resources can be URLs, or files found either on the classpath or outside somewhere in the file system. In the event the configured resource is a Groovy script, especially if the script is set to reload on changes, you may need to adjust the total number ofinotify instances.
On Linux, you may need to add the following line to /etc/sysctl.conf:
fs.inotify.max_user_instances = 256.
You can check the current value via cat /proc/sys/fs/inotify/max_user_instances.
In situations and scenarios where CAS is able to automatically watch the underlying resource
for changes and detect updates and modifications dynamically, you may be able to specify the following
setting as either an environment variable or system property with a value of false to disable
the resource watcher: org.apereo.cas.util.io.PathWatcherService.
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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.private-key-jwt.jwks.kid=
The key identifier.
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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, especially 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.
Federation configuration
The federation nature of a delegated OIDC client must be explicitely enabled via CAS configuration.
Federation support translates into two aspects:
- Exposing the entity statement of the OIDC client (The CAS server itself)
- Resolving the trust chain to retrieve the target provider via the trust anchors.
The following settings and properties are available from the CAS configuration catalog:
cas.authn.pac4j.oidc[0].generic.federation.jwks.location=
Specific JWKS for the federation. The location of the resource. Resources can be URLs, or files found either on the classpath or outside somewhere in the file system. In the event the configured resource is a Groovy script, especially if the script is set to reload on changes, you may need to adjust the total number ofinotify instances.
On Linux, you may need to add the following line to /etc/sysctl.conf:
fs.inotify.max_user_instances = 256.
You can check the current value via cat /proc/sys/fs/inotify/max_user_instances.
In situations and scenarios where CAS is able to automatically watch the underlying resource
for changes and detect updates and modifications dynamically, you may be able to specify the following
setting as either an environment variable or system property with a value of false to disable
the resource watcher: org.apereo.cas.util.io.PathWatcherService.
|
cas.authn.pac4j.oidc[0].generic.federation.application-type=web
Application type for the RP (client) entity statement.
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cas.authn.pac4j.oidc[0].generic.federation.client-registration-types=explicit,automatic
Registration types for the RP (client) entity statement.
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cas.authn.pac4j.oidc[0].generic.federation.contact-emails=
The contact emails for this client.
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cas.authn.pac4j.oidc[0].generic.federation.contact-name=
The contact name for this client.
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cas.authn.pac4j.oidc[0].generic.federation.enabled=
Whether the federation is enabled.
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cas.authn.pac4j.oidc[0].generic.federation.grant-types=authorization_code
Grant types for the RP (client) entity statement.
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cas.authn.pac4j.oidc[0].generic.federation.jwks.kid=
The key identifier.
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cas.authn.pac4j.oidc[0].generic.federation.response-types=code
Response types for the RP (client) entity statement.
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cas.authn.pac4j.oidc[0].generic.federation.scopes=openid,email,profile
Scopes for the RP (client) entity statement.
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cas.authn.pac4j.oidc[0].generic.federation.target-op=
The target OIDC provider in federation.
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cas.authn.pac4j.oidc[0].generic.federation.trust-anchors=
The trust anchors to use for federation. This is defined as a map; the key is the trust anchor issuer and the value is the JWKS URL of the trust anchor.
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cas.authn.pac4j.oidc[0].generic.federation.validity-in-days=90
Validity in days of the RP (client) entity statement.
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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, especially 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.
For exposing the entity statement, a JWKS must be defined as a resource (file or URL) with an optional key identifier. The
entity statement is exposed on the /rp/{clientName}/.well-known/openid-federation URL of the CAS server.
For resolving the trust chain and authenticating on a target provider, the OP issuer
must be defined as the targetOp property along with one or more
trust anchors.
The following settings and properties are available from the CAS configuration catalog:
cas.authn.pac4j.oidc[0].generic.federation.jwks.location=
Specific JWKS for the federation. The location of the resource. Resources can be URLs, or files found either on the classpath or outside somewhere in the file system. In the event the configured resource is a Groovy script, especially if the script is set to reload on changes, you may need to adjust the total number ofinotify instances.
On Linux, you may need to add the following line to /etc/sysctl.conf:
fs.inotify.max_user_instances = 256.
You can check the current value via cat /proc/sys/fs/inotify/max_user_instances.
In situations and scenarios where CAS is able to automatically watch the underlying resource
for changes and detect updates and modifications dynamically, you may be able to specify the following
setting as either an environment variable or system property with a value of false to disable
the resource watcher: org.apereo.cas.util.io.PathWatcherService.
|
cas.authn.pac4j.oidc[0].generic.federation.application-type=web
Application type for the RP (client) entity statement.
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cas.authn.pac4j.oidc[0].generic.federation.client-registration-types=explicit,automatic
Registration types for the RP (client) entity statement.
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cas.authn.pac4j.oidc[0].generic.federation.contact-emails=
The contact emails for this client.
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cas.authn.pac4j.oidc[0].generic.federation.contact-name=
The contact name for this client.
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cas.authn.pac4j.oidc[0].generic.federation.enabled=
Whether the federation is enabled.
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cas.authn.pac4j.oidc[0].generic.federation.grant-types=authorization_code
Grant types for the RP (client) entity statement.
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cas.authn.pac4j.oidc[0].generic.federation.jwks.kid=
The key identifier.
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cas.authn.pac4j.oidc[0].generic.federation.response-types=code
Response types for the RP (client) entity statement.
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cas.authn.pac4j.oidc[0].generic.federation.scopes=openid,email,profile
Scopes for the RP (client) entity statement.
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cas.authn.pac4j.oidc[0].generic.federation.target-op=
The target OIDC provider in federation.
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cas.authn.pac4j.oidc[0].generic.federation.trust-anchors=
The trust anchors to use for federation. This is defined as a map; the key is the trust anchor issuer and the value is the JWKS URL of the trust anchor.
|
cas.authn.pac4j.oidc[0].generic.federation.validity-in-days=90
Validity in days of the RP (client) entity statement.
|
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, especially 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
|
|
BOOLEAN
|
DELEGATED_AUTHN
|
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
|
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
|
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.