Google Authenticator Authentication

Google Authenticator generates 2-step verification codes on your phone. With 2-step verification signing in will require a code generated by the Google Authenticator app in addition to primary authentication. Learn more about the topic here.

Note that the functionality presented here should also be compatible with the likes of LastPass Authenticator, etc.

Configuration

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

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

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

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

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

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-gauth"
}

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.gauth.core.scratch-codes.encryption.key=

The encryption key. The encryption key by default and unless specified otherwise must be randomly-generated string whose length is defined by the encryption key size setting.

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

_{How can I configure this property?}

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

:information_source: 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.gauth.core.scratch-codes.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: 
      gauth: 
        core: "..."          scratch-codes: 
            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.gauth.core.scratch-codes.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_GAUTH_CORE_SCRATCH_CODES_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.gauth.core.scratch-codes.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.gauth.core.issuer=CASIssuer

Issuer used in the barcode when dealing with device registration events. Used in the registration URL to identify CAS.

org.apereo.cas.configuration.model.support.mfa.gauth.CoreGoogleAuthenticatorMultifactorProperties.

_{How can I configure this property?}

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

:information_source: Note

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

cas.authn.mfa.gauth.core.issuer=CASIssuer

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      gauth: 
        core: "CASIssuer"          issuer: 

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.gauth.core.issuer="CASIssuer" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_GAUTH_CORE_ISSUER="CASIssuer"

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.gauth.core.issuer="CASIssuer"

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.gauth.core.label=CASLabel

Label used in the barcode when dealing with device registration events. Used in the registration URL to identify CAS.

org.apereo.cas.configuration.model.support.mfa.gauth.CoreGoogleAuthenticatorMultifactorProperties.

_{How can I configure this property?}

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

:information_source: Note

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

cas.authn.mfa.gauth.core.label=CASLabel

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      gauth: 
        core: "CASLabel"          label: 

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.gauth.core.label="CASLabel" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_GAUTH_CORE_LABEL="CASLabel"

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.gauth.core.label="CASLabel"

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. You should only include this field in your
configuration if you need to modify the default value.}

cas.authn.mfa.gauth.core.scratch-codes.encryption.key-size=16

Encryption key size.

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

_{How can I configure this property?}

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

:information_source: Note

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

cas.authn.mfa.gauth.core.scratch-codes.encryption.key-size=16

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      gauth: 
        core: "16"          scratch-codes: 
            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.gauth.core.scratch-codes.encryption.key-size="16" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_GAUTH_CORE_SCRATCH_CODES_ENCRYPTION_KEY_SIZE="16"

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.gauth.core.scratch-codes.encryption.key-size="16"

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.gauth.core.code-digits=6

Length of the generated code.

org.apereo.cas.configuration.model.support.mfa.gauth.CoreGoogleAuthenticatorMultifactorProperties.

_{How can I configure this property?}

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

:information_source: Note

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

cas.authn.mfa.gauth.core.code-digits=6

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      gauth: 
        core: "6"          code-digits: 

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.gauth.core.code-digits="6" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_GAUTH_CORE_CODE_DIGITS="6"

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.gauth.core.code-digits="6"

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.gauth.core.multiple-device-registration-enabled=false

When enabled, allows the user/system to accept multiple accounts and device registrations per user, allowing one to switch between or register new devices/accounts automatically.

org.apereo.cas.configuration.model.support.mfa.gauth.CoreGoogleAuthenticatorMultifactorProperties.

_{How can I configure this property?}

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

:information_source: Note

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

cas.authn.mfa.gauth.core.multiple-device-registration-enabled=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      gauth: 
        core: "..."          multiple-device-registration-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.gauth.core.multiple-device-registration-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_GAUTH_CORE_MULTIPLE_DEVICE_REGISTRATION_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.gauth.core.multiple-device-registration-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.gauth.core.time-step-size=30

The expiration time of the generated code in seconds.

org.apereo.cas.configuration.model.support.mfa.gauth.CoreGoogleAuthenticatorMultifactorProperties.

_{How can I configure this property?}

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

:information_source: Note

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

cas.authn.mfa.gauth.core.time-step-size=30

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      gauth: 
        core: "30"          time-step-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.gauth.core.time-step-size="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_GAUTH_CORE_TIME_STEP_SIZE="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.gauth.core.time-step-size="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.gauth.core.trusted-device-enabled=false

Indicates whether this provider should support trusted devices.

org.apereo.cas.configuration.model.support.mfa.gauth.CoreGoogleAuthenticatorMultifactorProperties.

_{How can I configure this property?}

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

:information_source: Note

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

cas.authn.mfa.gauth.core.trusted-device-enabled=...

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      gauth: 
        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.gauth.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_GAUTH_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.gauth.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.gauth.core.window-size=3

Since TOTP passwords are time-based, it is essential that the clock of both the server and the client are synchronised within the tolerance defined here as the window size.

org.apereo.cas.configuration.model.support.mfa.gauth.CoreGoogleAuthenticatorMultifactorProperties.

_{How can I configure this property?}

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

:information_source: Note

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

cas.authn.mfa.gauth.core.window-size=3

CAS properties can be specified using the YAML syntax:

cas: 
  authn: 
    mfa: 
      gauth: 
        core: "3"          window-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.gauth.core.window-size="3" -jar build/libs/cas.war

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

export CAS_AUTHN_MFA_GAUTH_CORE_WINDOW_SIZE="3"

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.gauth.core.window-size="3"

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.