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.

FIDO2 WebAuthn Multifactor Authentication

WebAuthn is an API that makes it very easy for a relying party, such as a web service, to integrate strong authentication into applications using support built in to all leading browsers and platforms. This means that web services can now easily offer their users strong authentication with a choice of authenticators such as security keys or built-in platform authenticators such as biometric readers.

Support is enabled by including the following module in the WAR overlay:

<dependency>
    <groupId>org.apereo.cas</groupId>
    <artifactId>cas-server-support-webauthn</artifactId>
    <version>${cas.version}</version>
</dependency>

implementation "org.apereo.cas:cas-server-support-webauthn:${project.'cas.version'}"

dependencyManagement {
    imports {
        mavenBom "org.apereo.cas:cas-server-support-bom:${project.'cas.version'}"
    }
}

dependencies {
    implementation "org.apereo.cas:cas-server-support-webauthn"
}

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-webauthn"
}

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.mfa.web-authn.crypto.encryption.key=

The encryption key is a JWT whose length is defined by the encryption key size setting.

org.apereo.cas.configuration.model.core.util.EncryptionJwtCryptoProperties.

_{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.mfa.web-authn.crypto.encryption.key=...

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: 
    mfa: 
      web-authn: 
        crypto: "..."          encryption: 
            key: 

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.mfa.web-authn.crypto.encryption.key="..." -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_MFA_WEB_AUTHN_CRYPTO_ENCRYPTION_KEY="..."

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.mfa.web-authn.crypto.encryption.key="..."

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.mfa.web-authn.crypto.signing.key=

The signing key is a JWT whose length is defined by the signing key size setting.

org.apereo.cas.configuration.model.core.util.SigningJwtCryptoProperties.

_{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.mfa.web-authn.crypto.signing.key=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "..."          signing: 
            key: 

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.mfa.web-authn.crypto.signing.key="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_SIGNING_KEY="..."

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.mfa.web-authn.crypto.signing.key="..."

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.mfa.web-authn.core.application-id=

The extension input to set for the appid extension when initiating authentication operations. If this member is set, starting an assertion op will automatically set the appid extension input, and finish assertion op will adjust its verification logic to also accept this AppID as an alternative to the RP ID. By default, this is not set.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.application-id=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "..."          application-id: 

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.mfa.web-authn.core.application-id="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_APPLICATION_ID="..."

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.mfa.web-authn.core.application-id="..."

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.mfa.web-authn.core.relying-party-id=

The id that will be set as the rp parameter when initiating registration operations, and which id hash will be compared against. This is a required parameter. A successful registration or authentication operation requires rp id hash to exactly equal the SHA-256 hash of this id member. Alternatively, it may instead equal the SHA-256 hash of application id if the latter is present.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.relying-party-id=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "..."          relying-party-id: 

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.mfa.web-authn.core.relying-party-id="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_RELYING_PARTY_ID="..."

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.mfa.web-authn.core.relying-party-id="..."

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.mfa.web-authn.core.relying-party-name=

The human-palatable name of the Relaying Party.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.relying-party-name=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "..."          relying-party-name: 

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.mfa.web-authn.core.relying-party-name="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_RELYING_PARTY_NAME="..."

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.mfa.web-authn.core.relying-party-name="..."

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.mfa.web-authn.crypto.alg=

The signing/encryption algorithm to use.

org.apereo.cas.configuration.model.core.util.EncryptionJwtSigningJwtCryptographyProperties.

_{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.mfa.web-authn.crypto.alg=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "..."          alg: 

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.mfa.web-authn.crypto.alg="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_ALG="..."

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.mfa.web-authn.crypto.alg="..."

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.mfa.web-authn.crypto.enabled=true

Whether crypto operations are enabled.

org.apereo.cas.configuration.model.core.util.EncryptionJwtSigningJwtCryptographyProperties.

_{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.mfa.web-authn.crypto.enabled=true

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "true"          enabled: 

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.mfa.web-authn.crypto.enabled="true" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_ENABLED="true"

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.mfa.web-authn.crypto.enabled="true"

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.mfa.web-authn.crypto.encryption.key-size=512

The encryption key size.

org.apereo.cas.configuration.model.core.util.EncryptionJwtCryptoProperties.

_{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.mfa.web-authn.crypto.encryption.key-size=512

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "512"          encryption: 
            key-size: 

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.mfa.web-authn.crypto.encryption.key-size="512" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_ENCRYPTION_KEY_SIZE="512"

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.mfa.web-authn.crypto.encryption.key-size="512"

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.mfa.web-authn.crypto.signing.key-size=512

The signing key size.

org.apereo.cas.configuration.model.core.util.SigningJwtCryptoProperties.

_{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.mfa.web-authn.crypto.signing.key-size=512

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "512"          signing: 
            key-size: 

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.mfa.web-authn.crypto.signing.key-size="512" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_SIGNING_KEY_SIZE="512"

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.mfa.web-authn.crypto.signing.key-size="512"

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.mfa.web-authn.crypto.strategy-type=ENCRYPT_AND_SIGN

Control the cipher sequence of operations. The accepted values are:

ENCRYPT_AND_SIGN: Encrypt the value first, and then sign.
SIGN_AND_ENCRYPT: Sign the value first, and then encrypt.

org.apereo.cas.configuration.model.core.util.EncryptionJwtSigningJwtCryptographyProperties.

_{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.mfa.web-authn.crypto.strategy-type=ENCRYPT_AND_SIGN

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "ENCRYPT_AND_SIGN"          strategy-type: 

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.mfa.web-authn.crypto.strategy-type="ENCRYPT_AND_SIGN" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_STRATEGY_TYPE="ENCRYPT_AND_SIGN"

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.mfa.web-authn.crypto.strategy-type="ENCRYPT_AND_SIGN"

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.mfa.web-authn.core.allow-primary-authentication=false

Configure the authentication flow to allow web-authn to be used as the first primary factor for authentication. Registered accounts with a valid webauthn registration record can choose to login using their device as the first step.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.allow-primary-authentication=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "..."          allow-primary-authentication: 

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.mfa.web-authn.core.allow-primary-authentication="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_ALLOW_PRIMARY_AUTHENTICATION="..."

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.mfa.web-authn.core.allow-primary-authentication="..."

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.mfa.web-authn.core.allow-untrusted-attestation=false

If false finish registration op will only allow registrations where the attestation signature can be linked to a trusted attestation root. This excludes self attestation and none attestation. Regardless of the value of this option, invalid attestation statements of supported formats will always be rejected. For example, a "packed" attestation statement with an invalid signature will be rejected even if this option is set to true.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.allow-untrusted-attestation=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "..."          allow-untrusted-attestation: 

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.mfa.web-authn.core.allow-untrusted-attestation="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_ALLOW_UNTRUSTED_ATTESTATION="..."

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.mfa.web-authn.core.allow-untrusted-attestation="..."

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.mfa.web-authn.core.allowed-origins=

The allowed origins that returned authenticator responses will be compared against. The default is set to the server name. A successful registration or authentication operation requires origins to exactly equal one of these values.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.allowed-origins=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "..."          allowed-origins: 

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.mfa.web-authn.core.allowed-origins="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_ALLOWED_ORIGINS="..."

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.mfa.web-authn.core.allowed-origins="..."

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.mfa.web-authn.core.attestation-conveyance-preference=DIRECT

Accepted values are: DIRECT, INDIRECT, NONE. The argument for the attestation parameter in registration operations. Unless your application has a concrete policy for authenticator attestation, it is recommended to leave this parameter undefined.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.attestation-conveyance-preference=DIRECT

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "DIRECT"          attestation-conveyance-preference: 

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.mfa.web-authn.core.attestation-conveyance-preference="DIRECT" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_ATTESTATION_CONVEYANCE_PREFERENCE="DIRECT"

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.mfa.web-authn.core.attestation-conveyance-preference="DIRECT"

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.mfa.web-authn.core.display-name-attribute=displayName

Name of the principal attribute that indicates the principal's display name, primarily used for device registration.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.display-name-attribute=displayName

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "displayName"          display-name-attribute: 

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.mfa.web-authn.core.display-name-attribute="displayName" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_DISPLAY_NAME_ATTRIBUTE="displayName"

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.mfa.web-authn.core.display-name-attribute="displayName"

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.mfa.web-authn.core.enabled=true

Whether WebAuthn functionality should be activated and enabled.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.enabled=true

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "true"          enabled: 

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.mfa.web-authn.core.enabled="true" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_ENABLED="true"

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.mfa.web-authn.core.enabled="true"

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.mfa.web-authn.core.expire-devices=30

Expire and forget device registration records after this period.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.expire-devices=30

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "30"          expire-devices: 

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.mfa.web-authn.core.expire-devices="30" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_EXPIRE_DEVICES="30"

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.mfa.web-authn.core.expire-devices="30"

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.mfa.web-authn.core.expire-devices-time-unit=

Device registration record expiration time unit.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.expire-devices-time-unit=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "..."          expire-devices-time-unit: 

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.mfa.web-authn.core.expire-devices-time-unit="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_EXPIRE_DEVICES_TIME_UNIT="..."

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.mfa.web-authn.core.expire-devices-time-unit="..."

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.mfa.web-authn.core.trusted-device-enabled=false

Indicates whether this provider should support trusted devices.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.trusted-device-enabled=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "..."          trusted-device-enabled: 

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.mfa.web-authn.core.trusted-device-enabled="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_TRUSTED_DEVICE_ENABLED="..."

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.mfa.web-authn.core.trusted-device-enabled="..."

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.mfa.web-authn.core.validate-signature-counter=true

If true, finish assertion op will fail if the signature counter value in the response is not strictly greater than the stored signature counter value.

org.apereo.cas.configuration.model.support.mfa.webauthn.WebAuthnMultifactorAuthenticationCoreProperties.

_{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.mfa.web-authn.core.validate-signature-counter=true

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        core: "true"          validate-signature-counter: 

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.mfa.web-authn.core.validate-signature-counter="true" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CORE_VALIDATE_SIGNATURE_COUNTER="true"

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.mfa.web-authn.core.validate-signature-counter="true"

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 signing/encryption algorithm to use.
# cas.authn.mfa.web-authn.crypto.alg=

# Whether crypto operations are enabled.
# cas.authn.mfa.web-authn.crypto.enabled=true

# The encryption key size.
# cas.authn.mfa.web-authn.crypto.encryption.key-size=512

# The signing key size.
# cas.authn.mfa.web-authn.crypto.signing.key-size=512

# Control the cipher sequence of operations.
# cas.authn.mfa.web-authn.crypto.strategy-type=ENCRYPT_AND_SIGN

# Configure the authentication flow to allow web-authn to be used as the first primary factor for authentication.
# cas.authn.mfa.web-authn.core.allow-primary-authentication=false

# If false finish registration op will only allow registrations where the attestation signature can be linked to a trusted attestation root.
# cas.authn.mfa.web-authn.core.allow-untrusted-attestation=false

# The allowed origins that returned authenticator responses will be compared against.
# cas.authn.mfa.web-authn.core.allowed-origins=

# Accepted values are: {@code DIRECT}, {@code INDIRECT}, {@code NONE}.
# cas.authn.mfa.web-authn.core.attestation-conveyance-preference=DIRECT

# Name of the principal attribute that indicates the principal's display name, primarily used for device registration.
# cas.authn.mfa.web-authn.core.display-name-attribute=displayName

# Whether WebAuthn functionality should be activated and enabled.
# cas.authn.mfa.web-authn.core.enabled=true

# Expire and forget device registration records after this period.
# cas.authn.mfa.web-authn.core.expire-devices=30

# Device registration record expiration time unit.
# cas.authn.mfa.web-authn.core.expire-devices-time-unit=

# Indicates whether this provider should support trusted devices.
# cas.authn.mfa.web-authn.core.trusted-device-enabled=false

# If true, finish assertion op will fail if the  signature counter value in the response is not strictly greater than the stored signature counter value.
# cas.authn.mfa.web-authn.core.validate-signature-counter=true

cas.authn.mfa.web-authn.crypto.encryption.key=

The encryption key is a JWT whose length is defined by the encryption key size setting.

org.apereo.cas.configuration.model.core.util.EncryptionJwtCryptoProperties.

_{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.mfa.web-authn.crypto.encryption.key=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "..."          encryption: 
            key: 

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.mfa.web-authn.crypto.encryption.key="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_ENCRYPTION_KEY="..."

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.mfa.web-authn.crypto.encryption.key="..."

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.mfa.web-authn.crypto.signing.key=

The signing key is a JWT whose length is defined by the signing key size setting.

org.apereo.cas.configuration.model.core.util.SigningJwtCryptoProperties.

_{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.mfa.web-authn.crypto.signing.key=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "..."          signing: 
            key: 

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.mfa.web-authn.crypto.signing.key="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_SIGNING_KEY="..."

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.mfa.web-authn.crypto.signing.key="..."

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.mfa.web-authn.crypto.alg=

The signing/encryption algorithm to use.

org.apereo.cas.configuration.model.core.util.EncryptionJwtSigningJwtCryptographyProperties.

_{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.mfa.web-authn.crypto.alg=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "..."          alg: 

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.mfa.web-authn.crypto.alg="..." -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_ALG="..."

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.mfa.web-authn.crypto.alg="..."

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.mfa.web-authn.crypto.enabled=true

Whether crypto operations are enabled.

org.apereo.cas.configuration.model.core.util.EncryptionJwtSigningJwtCryptographyProperties.

_{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.mfa.web-authn.crypto.enabled=true

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "true"          enabled: 

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.mfa.web-authn.crypto.enabled="true" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_ENABLED="true"

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.mfa.web-authn.crypto.enabled="true"

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.mfa.web-authn.crypto.encryption.key-size=512

The encryption key size.

org.apereo.cas.configuration.model.core.util.EncryptionJwtCryptoProperties.

_{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.mfa.web-authn.crypto.encryption.key-size=512

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "512"          encryption: 
            key-size: 

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.mfa.web-authn.crypto.encryption.key-size="512" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_ENCRYPTION_KEY_SIZE="512"

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.mfa.web-authn.crypto.encryption.key-size="512"

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.mfa.web-authn.crypto.signing.key-size=512

The signing key size.

org.apereo.cas.configuration.model.core.util.SigningJwtCryptoProperties.

_{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.mfa.web-authn.crypto.signing.key-size=512

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "512"          signing: 
            key-size: 

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.mfa.web-authn.crypto.signing.key-size="512" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_SIGNING_KEY_SIZE="512"

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.mfa.web-authn.crypto.signing.key-size="512"

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.mfa.web-authn.crypto.strategy-type=ENCRYPT_AND_SIGN

Control the cipher sequence of operations. The accepted values are:

ENCRYPT_AND_SIGN: Encrypt the value first, and then sign.
SIGN_AND_ENCRYPT: Sign the value first, and then encrypt.

org.apereo.cas.configuration.model.core.util.EncryptionJwtSigningJwtCryptographyProperties.

_{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.mfa.web-authn.crypto.strategy-type=ENCRYPT_AND_SIGN

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      web-authn: 
        crypto: "ENCRYPT_AND_SIGN"          strategy-type: 

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.mfa.web-authn.crypto.strategy-type="ENCRYPT_AND_SIGN" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_WEB_AUTHN_CRYPTO_STRATEGY_TYPE="ENCRYPT_AND_SIGN"

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.mfa.web-authn.crypto.strategy-type="ENCRYPT_AND_SIGN"

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.

This CAS feature is able to accept signing and encryption crypto keys. In most scenarios if keys are not provided, CAS will auto-generate them. The following instructions apply if you wish to manually and beforehand create the signing and encryption keys.

Note that if you are asked to create a JWK of a certain size for the key, you are to use the following set of commands to generate the token:

wget https://raw.githubusercontent.com/apereo/cas/master/etc/jwk-gen.jar
java -jar jwk-gen.jar -t oct -s [size]

The outcome would be similar to:

{
  "kty": "oct",
  "kid": "...",
  "k": "..."
}

The generated value for k needs to be assigned to the relevant CAS settings. Note that keys generated via the above algorithm are processed by CAS using the Advanced Encryption Standard (AES) algorithm which is a specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology.

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.

Discoverable Credentials

It is possible to allow WebAuthN to act as a standalone authentication strategy for primary authentication. Using this approach, user accounts and FIDO2-enabled devices that have already registered with CAS are given the option to login using their FIDO2-enabled device for a passwordless authentication experience.

Discoverable Credential means that the private key and associated metadata is stored in persistent memory on the authenticator, instead of encrypted and stored on the relying party server.

Device registration can occur out of band using available CAS APIs, or by allowing users to pass through the registration flow as part of the typical multifactor authentication. See below for details on device registration.