Logback Logging

CAS does also support Logback as an alternative logging engine. At a high level, the Logback architecture is similar to that of Log4j where you have Logger, Appender and Layout components typically defined inside a logback.xml file.

Refer to the Logback documentation to learn more.

Configuration

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-logback</artifactId>
    <version>${cas.version}</version>
</dependency>
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implementation "org.apereo.cas:cas-server-support-logback:${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-logback"
}
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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-logback"
}

You must also make sure the following modules and dependencies are excluded from the WAR overlay:

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configurations.all {
    exclude(group: "org.apache.logging.log4j", module: "log4j-api")
    exclude(group: "org.apache.logging.log4j", module: "log4j-jakarta-web")
    exclude(group: "org.apache.logging.log4j", module: "log4j-web")
    exclude(group: "org.apache.logging.log4j", module: "log4j-jcl")
    exclude(group: "org.apache.logging.log4j", module: "log4j-slf4j-impl")
    exclude(group: "org.apache.logging.log4j", module: "log4j-slf4j2-impl")
    
    exclude(group: "org.apereo.cas", module: "cas-server-core-logging")
}

A sample logback.xml file follows:

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<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="30 seconds">
    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>%white(%d{yyyy-MM-dd HH:mm:ss}) %highlight(%-5level) %cyan(%logger{15}) - %msg%n</Pattern>
        </layout>
    </appender>
    <logger name="org.apereo.cas" level="info" additivity="false">
        <appender-ref ref="console" />
    </logger>
    <root level="info">
        <appender-ref ref="console" />
    </root>
</configuration>
:warning: Be Careful

Sanitizing log data to remove sensitive ticket ids such as ticket-granting tickets or proxy-granting tickets is not handled by CAS when Logback is used. While this may be worked out in future releases, you should be extra careful to cleanse log data prior to sharing it with external systems such as Splunk or Syslog, etc.

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.logging.cloudwatch.credential-access-key=
  • Use access-key provided by AWS to authenticate.

    This setting supports the Spring Expression Language.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.credential-secret-key=
  • Use secret key provided by AWS to authenticate.

    This setting supports the Spring Expression Language.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.endpoint=
  • AWS custom endpoint.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.log-group-name=
  • A log group is a container that organizes and stores log streams that share the same retention, monitoring, and access control settings. Each log group can have a unique name, and you can think of it as a logical grouping of logs that relate to a specific application, service, or environment.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.log-stream-name=
  • A log stream is a sequence of log events that share the same source. Each log stream belongs to a log group, and you can have multiple log streams within a single log group. Log streams are typically used to separate log data from different sources within the same application or service.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.region=
  • AWS region used.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.gcp.log-name=
  • In Google Cloud Logging, the log name is an identifier that specifies the particular log to which log entries are written or from which they are retrieved. It is an essential component when interacting with logs using the Google Cloud Logging API, as it allows you to target specific logs for querying or analysis.

    It typically has the following syntax: projects/[PROJECT_ID]/logs/[LOG_ID]

    org.apereo.cas.configuration.model.support.aws.GoogleCloudLogsProperties.

    How can I configure this property?

  • cas.logging.gcp.project-id=
  • A Project ID is a unique identifier assigned to a specific project within your GCP environment. The Project ID is globally unique across all GCP projects, meaning no two projects can have the same Project ID. The Project ID is used in various API calls, configurations, and URLs to uniquely identify your CAS project.

    org.apereo.cas.configuration.model.support.aws.GoogleCloudLogsProperties.

    How can I configure this property?

    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.logging.mdc.enabled=true
  • Allow CAS to add http request details into the logging's MDC filter. Mapped Diagnostic Context is essentially a map maintained by the logging framework where the application code provides key-value pairs which can then be inserted by the logging framework in log messages. MDC data can also be highly helpful in filtering messages or triggering certain actions.

    org.apereo.cas.configuration.model.core.logging.MdcLoggingProperties.

    How can I configure this property?

  • cas.logging.mdc.headers-to-exclude=
  • A list of headers to exclude. This list is used to specify parameters that should be excluded from MDC logging. The parameter names can be specified as regular expressions.

    This settings supports regular expression patterns. [?].

    org.apereo.cas.configuration.model.core.logging.MdcLoggingProperties.

    How can I configure this property?

  • cas.logging.mdc.parameters-to-exclude=
  • A list of parameters to exclude. This list is used to specify parameters that should be excluded from MDC logging. The parameter names can be specified as regular expressions.

    This settings supports regular expression patterns. [?].

    org.apereo.cas.configuration.model.core.logging.MdcLoggingProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.client-execution-timeout=10000
  • Client execution timeout.

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

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.connection-timeout=5000
  • Connection timeout.

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

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.local-address=
  • Local address.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.max-connections=10
  • Maximum connections setting.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.profile-name=
  • Profile name to use.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.profile-path=
  • Profile path.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.proxy-host=
  • Optionally specifies the proxy host to connect through.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.proxy-password=
  • Optionally specifies the proxy password to connect through.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.proxy-username=
  • Optionally specifies the proxy username to connect through.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.retry-mode=STANDARD
  • Outline the requested retry mode. Accepted values are STANDARD, LEGACY.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.socket-timeout=5000
  • Socket timeout.

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

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.cloudwatch.use-reaper=false
  • Flag that indicates whether to use reaper.

    org.apereo.cas.configuration.model.support.aws.AmazonCloudWatchLogsProperties.

    How can I configure this property?

  • cas.logging.gcp.labels=
  • Map of resource labels to filter log entries. Key is the resource label name, and value is the actual label itself.

    org.apereo.cas.configuration.model.support.aws.GoogleCloudLogsProperties.

    How can I configure this property?

    The configuration settings listed below are tagged as Third Party in the CAS configuration metadata. This flag indicates that the configuration setting is not controlled, owned or managed by the CAS ecosystem, and affects functionality that is offered by a third-party library, such as Spring Boot or Spring Cloud to CAS. For additional info, you might have to visit the third-party source to find more details.

  • logging.charset.console=
  • Charset to use for console output.

    How can I configure this property?

  • logging.charset.file=
  • Charset to use for file output.

    How can I configure this property?

  • logging.config=
  • Location of the logging configuration file. For instance, `classpath:logback.xml` for Logback.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.exception-conversion-word=%wEx
  • Conversion word used when logging exceptions.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.file=
  • Log file name (for instance, `myapp.log`). Names can be an exact location or relative to the current directory.

    How can I configure this property?

    Deprecation status is ERRORwith a replacement setting: logging.file.name.

  • logging.file.clean-history-on-start=false
  • Whether to clean the archive log files on startup. Only supported with the default logback setup.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

    Deprecation status is WARNINGwith a replacement setting: logging.logback.rollingpolicy.clean-history-on-start.

  • logging.file.max-history=7
  • Maximum number of archive log files to keep. Only supported with the default logback setup.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

    Deprecation status is WARNINGwith a replacement setting: logging.logback.rollingpolicy.max-history.

  • logging.file.max-size=10MB
  • Maximum log file size. Only supported with the default logback setup.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

    Deprecation status is WARNINGwith a replacement setting: logging.logback.rollingpolicy.max-file-size.

  • logging.file.name=
  • Log file name (for instance, `myapp.log`). Names can be an exact location or relative to the current directory.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.file.path=
  • Location of the log file. For instance, `/var/log`.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.file.total-size-cap=0B
  • Total size of log backups to be kept. Only supported with the default logback setup.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

    Deprecation status is WARNINGwith a replacement setting: logging.logback.rollingpolicy.total-size-cap.

  • logging.group=
  • Log groups to quickly change multiple loggers at the same time. For instance, `logging.group.db=org.hibernate,org.springframework.jdbc`.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.include-application-group=true
  • Whether to include the application group in the logs.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.include-application-name=true
  • Whether to include the application name in the logs.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.level=
  • Log levels severity mapping. For instance, `logging.level.org.springframework=DEBUG`.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.log4j2.config.override=
  • Overriding configuration files used to create a composite configuration.

    How can I configure this property?

  • logging.logback.rollingpolicy.clean-history-on-start=false
  • Whether to clean the archive log files on startup.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.logback.rollingpolicy.file-name-pattern=${LOG_FILE}.%d{yyyy-MM-dd}.%i.gz
  • Pattern for rolled-over log file names.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.logback.rollingpolicy.max-file-size=10MB
  • Maximum log file size.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.logback.rollingpolicy.max-history=7
  • Maximum number of archive log files to keep.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.logback.rollingpolicy.total-size-cap=0B
  • Total size of log backups to be kept.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.path=
  • Location of the log file. For instance, `/var/log`.

    How can I configure this property?

    Deprecation status is ERRORwith a replacement setting: logging.file.path.

  • logging.pattern.console=
  • Appender pattern for output to the console. Its default value varies according to the logging system.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.pattern.correlation=
  • Appender pattern for log correlation. Its default value varies according to the logging system.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.pattern.dateformat=yyyy-MM-dd'T'HH:mm:ss.SSSXXX
  • Appender pattern for log date format.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.pattern.file=
  • Appender pattern for output to a file. Its default value varies according to the logging system.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.pattern.level=%5p
  • Appender pattern for log level.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.pattern.rolling-file-name=${LOG_FILE}.%d{yyyy-MM-dd}.%i.gz
  • Pattern for rolled-over log file names. Supported only with the default Logback setup.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

    Deprecation status is WARNINGwith a replacement setting: logging.logback.rollingpolicy.file-name-pattern.

  • logging.register-shutdown-hook=true
  • Register a shutdown hook for the logging system when it is initialized. Disabled automatically when deployed as a war file.

    org.springframework.boot.context.logging.LoggingApplicationListener.

    How can I configure this property?

  • logging.structured.ecs.service.environment=
  • Structured ECS service environment.

    How can I configure this property?

  • logging.structured.ecs.service.name=
  • Structured ECS service name (defaults to 'spring.application.name').

    How can I configure this property?

  • logging.structured.ecs.service.node-name=
  • Structured ECS service node name.

    How can I configure this property?

  • logging.structured.ecs.service.version=
  • Structured ECS service version (defaults to 'spring.application.version').

    How can I configure this property?

  • logging.structured.format.console=
  • Structured logging format for output to the console. Must be either a format id or a fully qualified class name.

    How can I configure this property?

  • logging.structured.format.file=
  • Structured logging format for output to a file. Must be either a format id or a fully qualified class name.

    How can I configure this property?

  • logging.structured.gelf.host=
  • Structured GELF host (defaults to 'spring.application.name').

    How can I configure this property?

  • logging.structured.gelf.service.version=
  • Structured GELF service version (defaults to 'spring.application.version').

    How can I configure this property?

  • logging.structured.json.add=
  • Additional members that should be added to structured logging JSON

    How can I configure this property?

  • logging.structured.json.customizer=
  • The fully qualified class name of a StructuredLoggingJsonMembersCustomizer

    How can I configure this property?

  • logging.structured.json.exclude=
  • Member paths that should be excluded from structured logging JSON

    How can I configure this property?

  • logging.structured.json.include=
  • Member paths that should be included in structured logging JSON

    How can I configure this property?

  • logging.structured.json.rename=
  • Mapping between member paths and an alternative name that should be used in structured logging JSON

    How can I configure this property?

  • logging.threshold.console=TRACE
  • Log level threshold for console output.

    How can I configure this property?

  • logging.threshold.file=TRACE
  • Log level threshold for file output.

    How can I configure this property?

    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.

    :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.

    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.