LDAP Monitoring

Monitor the status and availability of an LDAP server.

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<dependency>
    <groupId>org.apereo.cas</groupId>
    <artifactId>cas-server-support-ldap-monitor</artifactId>
    <version>${cas.version}</version>
</dependency>
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implementation "org.apereo.cas:cas-server-support-ldap-monitor:${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-ldap-monitor"
}
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dependencies {
    /*
        The following platform references are included automatically and are listed 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-ldap-monitor"
}

The following settings and properties are available from the CAS configuration catalog:

cas.monitor.ldap[0].bind-credentialThe bind credential to use when connecting to LDAP.
no default
Required

The bind credential to use when connecting to LDAP.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].bind-dnThe bind DN to use when connecting to LDAP.
no default
Required
The bind DN to use when connecting to LDAP. LDAP connection configuration injected into the LDAP connection pool can be initialized with the following parameters:
  • bindDn/bindCredential provided - Use the provided credentials to bind when initializing connections.
  • bindDn/bindCredential set to * - Use a fast-bind strategy to initialize the pool.
  • bindDn/bindCredential set to blank - Skip connection initializing; perform operations anonymously.
  • SASL mechanism provided - Use the given SASL mechanism to bind when initializing connections.
Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].ldap-urlThe LDAP url to the server.
no default
Required

The LDAP url to the server. More than one may be specified, separated by space and/or comma.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldapOptions for monitoring LDAP resources.
no default

Options for monitoring LDAP resources.

Type
List<LdapMonitorProperties>
Default
none
Defined by
MonitorProperties
cas.monitor.ldap[0].allow-multiple-dnsWhether search/query results are allowed to match on multiple DNs, or whether a single unique DN is expected for the result.
no default

Whether search/query results are allowed to match on multiple DNs, or whether a single unique DN is expected for the result.

Type
boolean
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].allow-multiple-entriesSet if multiple Entries are allowed.
no default

Set if multiple Entries are allowed.

Type
boolean
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].binary-attributesIndicate the collection of attributes that are to be tagged and processed as binary attributes by the underlying search resolver.
no default

Indicate the collection of attributes that are to be tagged and processed as binary attributes by the underlying search resolver.

Type
List<String>
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].block-wait-timeThe length of time the pool will block.
no default
Duration

The length of time the pool will block. By default the pool will block indefinitely and there is no guarantee that waiting threads will be serviced in the order in which they made their request. This option should be used with a blocking connection pool when you need to control the exact number of connections that can be created

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].connect-timeoutSets the maximum amount of time that connects will block.
no default
Duration

Sets the maximum amount of time that connects will block.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].connection-strategyIf multiple URLs are provided as the ldapURL this describes how each URL will be processed.
no default
If multiple URLs are provided as the ldapURL this describes how each URL will be processed.
  • ACTIVE_PASSIVE First LDAP will be used for every request unless it fails and then the next shall be used.
  • ROUND_ROBIN For each new connection the next url in the list will be used.
  • RANDOM For each new connection a random LDAP url will be selected.
  • DNS_SRV LDAP urls based on DNS SRV records of the configured/given LDAP url will be used.
Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].disable-poolingWhether to use a pooled connection factory in components.
no default

Whether to use a pooled connection factory in components.

Type
boolean
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].enabledWhether LDAP monitoring should be enabled.
true

Whether LDAP monitoring should be enabled.

Type
boolean
Default
true
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].fail-fastAttempt to populate the connection pool early on startup and fail quickly if something goes wrong.
no default

Attempt to populate the connection pool early on startup and fail quickly if something goes wrong.

Type
boolean
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].follow-referralsSet if search referrals should be followed.
no default

Set if search referrals should be followed.

Type
boolean
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].hostname-verifierHostname verification options.
no default
Hostname verification options. Available values are as follows:
  • DEFAULT: Default option, forcing verification.
  • ANY: Skip hostname verification and allow all.
Type
AbstractLdapProperties.LdapHostnameVerifierOptions
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].idle-timeRemoves connections from the pool based on how long they have been idle in the available queue.
no default
Duration

Removes connections from the pool based on how long they have been idle in the available queue. Prunes connections that have been idle for more than the indicated amount.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].keystorePath to the keystore used for SSL connections.
no default
SpEL

Path to the keystore used for SSL connections. Typically contains SSL certificates for the LDAP server.

Type
String
Default
none
Defined by
LdapMonitorProperties
Supports
Spring Expression Language
cas.monitor.ldap[0].keystore-passwordKeystore password.
no default
SpEL

Keystore password.

Type
String
Default
none
Defined by
LdapMonitorProperties
Supports
Spring Expression Language
cas.monitor.ldap[0].keystore-typeThe type of keystore.
no default

The type of keystore. PKCS12 or JKS. If left blank, defaults to the default keystore type indicated by the underlying Java platform.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].max-pool-sizeMaximum LDAP connection pool size which the pool can use to grow.
no default

Maximum LDAP connection pool size which the pool can use to grow.

Type
int
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].max-waitWhen monitoring the LDAP connection pool, indicates the amount of time the operation must wait before it times outs and considers the pool in bad shape.
PT5S
Duration

When monitoring the LDAP connection pool, indicates the amount of time the operation must wait before it times outs and considers the pool in bad shape.

Type
String
Default
PT5S
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].min-pool-sizeMinimum LDAP connection pool size.
no default

Minimum LDAP connection pool size. Size the pool should be initialized to and pruned to

Type
int
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].nameName of the LDAP handler.
no default

Name of the LDAP handler.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].pool-passivatorYou may receive unexpected LDAP failures, when CAS is configured to authenticate using DIRECT or AUTHENTICATED types and LDAP is locked down to not allow anonymous binds/searches.
no default
You may receive unexpected LDAP failures, when CAS is configured to authenticate using DIRECT or AUTHENTICATED types and LDAP is locked down to not allow anonymous binds/searches. Every second attempt with a given LDAP connection from the pool would fail if it was on the same connection as a failed login attempt, and the regular connection validator would similarly fail. When a connection is returned back to a pool, it still may contain the principal and credentials from the previous attempt. Before the next bind attempt using that connection, the validator tries to validate the connection again but fails because it’s no longer trying with the configured bind credentials but with whatever user DN was used in the previous step. Given the validation failure, the connection is closed and CAS would deny access by default. Passivators attempt to reconnect to LDAP with the configured bind credentials, effectively resetting the connection to what it should be after each bind request. Furthermore if you are seeing errors in the logs that resemble a 'Operation exception encountered, reopening connection' type of message, this usually is an indication that the connection pool’s validation timeout established and created by CAS is greater than the timeout configured in the LDAP server, or more likely, in the load balancer in front of the LDAP servers. You can adjust the LDAP server session’s timeout for connections, or you can teach CAS to use a validity period that is equal or less than the LDAP server session’s timeout. Accepted values are:
  • NONE: No passivation takes place.
  • BIND: The default behavior which passivates a connection by performing a bind operation on it. This option requires the availability of bind credentials when establishing connections to LDAP.
Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].pool.keep-alive-timeThis property controls the keepalive interval for a connection in the pool.
0
Duration

This property controls the keepalive interval for a connection in the pool. An in-use connection will never be tested by the keepalive thread, only when it is idle will it be tested. Default is zero, which disables this feature.

Type
String
Default
0
Defined by
ConnectionPoolingProperties
cas.monitor.ldap[0].pool.max-sizeControls the maximum number of connections to keep in the pool, including both idle and in-use connections.
18

Controls the maximum number of connections to keep in the pool, including both idle and in-use connections.

Type
int
Default
18
Defined by
ConnectionPoolingProperties
cas.monitor.ldap[0].pool.max-waitSets the maximum time in seconds that this data source will wait while attempting to connect to a database.
PT2S
Duration

Sets the maximum time in seconds that this data source will wait while attempting to connect to a database.

A value of zero specifies that the timeout is the default system timeout if there is one; otherwise, it specifies that there is no timeout.

Type
String
Default
PT2S
Defined by
ConnectionPoolingProperties
cas.monitor.ldap[0].pool.maximum-lifetimeThis property controls the maximum lifetime of a connection in the pool.
PT10M
Duration

This property controls the maximum lifetime of a connection in the pool. When a connection reaches this timeout, even if recently used, it will be retired from the pool. An in-use connection will never be retired, only when it is idle will it be removed.

Type
String
Default
PT10M
Defined by
ConnectionPoolingProperties
cas.monitor.ldap[0].pool.min-sizeControls the minimum size that the pool is allowed to reach, including both idle and in-use connections.
6

Controls the minimum size that the pool is allowed to reach, including both idle and in-use connections.

Type
int
Default
6
Defined by
ConnectionPoolingProperties
cas.monitor.ldap[0].pool.nameSet the name of the connection pool.
no default

Set the name of the connection pool. This is primarily used for the MBean to uniquely identify the pool configuration.

Type
String
Default
none
Defined by
ConnectionPoolingProperties
cas.monitor.ldap[0].pool.suspensionWhether or not pool suspension is allowed.
no default

Whether or not pool suspension is allowed.

There is a performance impact when pool suspension is enabled. Unless you need it (for a redundancy system for example) do not enable it.

Type
boolean
Default
none
Defined by
ConnectionPoolingProperties
cas.monitor.ldap[0].pool.timeout-millisThe maximum number of milliseconds that the pool will wait for a connection to be validated as alive.
1000

The maximum number of milliseconds that the pool will wait for a connection to be validated as alive.

Type
long
Default
1000
Defined by
ConnectionPoolingProperties
cas.monitor.ldap[0].prune-periodRemoves connections from the pool based on how long they have been idle in the available queue.
no default
Duration

Removes connections from the pool based on how long they have been idle in the available queue. Run the pruning process at the indicated interval.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].response-timeoutDuration of time to wait for responses.
no default
Duration

Duration of time to wait for responses.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].sasl-authorization-idSASL authorization id.
no default

SASL authorization id.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].sasl-mechanismThe SASL mechanism.
no default

The SASL mechanism.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].sasl-mutual-authWhether SASL mutual authentication is enabled.
no default

Whether SASL mutual authentication is enabled.

Type
Boolean
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].sasl-quality-of-protectionSASL quality of protected.
no default

SASL quality of protected.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].sasl-realmThe SASL realm.
no default

The SASL realm.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].sasl-security-strengthSASL security strength.
no default

SASL security strength.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].trust-certificatesPath of the trust certificates to use for the SSL connection.
no default

Path of the trust certificates to use for the SSL connection. Ignores keystore-related settings when activated and used.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].trust-managerTrust Manager options.
no default
Trust Manager options. Trust managers are responsible for managing the trust material that is used when making LDAP trust decisions, and for deciding whether credentials presented by a peer should be accepted. Accepted values are:
  • DEFAULT: Enable and force the default JVM trust managers.
  • ANY: Trust any client or server.
Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].trust-storePath to the keystore used to determine which certificates or certificate authorities should be trusted.
no default
SpEL

Path to the keystore used to determine which certificates or certificate authorities should be trusted. Used when connecting to an LDAP server via LDAPS or startTLS connection. If left blank, the default truststore for the Java runtime is used.

Type
String
Default
none
Defined by
LdapMonitorProperties
Supports
Spring Expression Language
cas.monitor.ldap[0].trust-store-passwordPassword needed to open the truststore.
no default
SpEL

Password needed to open the truststore.

Type
String
Default
none
Defined by
LdapMonitorProperties
Supports
Spring Expression Language
cas.monitor.ldap[0].trust-store-typeThe type of trust keystore that determines which certificates or certificate authorities are trusted.
no default

The type of trust keystore that determines which certificates or certificate authorities are trusted. Types depend on underlying java platform, typically PKCS12 or JKS. If left blank, defaults to the default keystore type indicated by the underlying Java platform.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].use-start-tlsWhether TLS should be used and enabled when establishing the connection.
no default

Whether TLS should be used and enabled when establishing the connection.

Type
boolean
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].validate-on-checkoutWhether connections should be validated when loaned out from the pool.
no default

Whether connections should be validated when loaned out from the pool.

Type
boolean
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].validate-periodPeriod at which pool should be validated.
no default
Duration

Period at which pool should be validated.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].validate-periodicallyWhether connections should be validated periodically when the pool is idle.
no default

Whether connections should be validated periodically when the pool is idle.

Type
boolean
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].validate-timeoutPeriod at which validation operations may time out.
no default
Duration

Period at which validation operations may time out.

Type
String
Default
none
Defined by
LdapMonitorProperties
cas.monitor.ldap[0].validator.attribute-nameAttribute name to use for the compare validator.
objectClass

Attribute name to use for the compare validator.

Type
String
Default
objectClass
Defined by
LdapValidatorProperties
cas.monitor.ldap[0].validator.attribute-valueAttribute values to use for the compare validator.
top

Attribute values to use for the compare validator.

Type
String
Default
top
Defined by
LdapValidatorProperties
cas.monitor.ldap[0].validator.base-dnBase DN to use for the search request of the search validator.
no default

Base DN to use for the search request of the search validator.

Type
String
Default
none
Defined by
LdapValidatorProperties
cas.monitor.ldap[0].validator.dnDN to compare to use for the compare validator.
no default

DN to compare to use for the compare validator.

Type
String
Default
none
Defined by
LdapValidatorProperties
cas.monitor.ldap[0].validator.scopeSearch scope to use for the search request of the search validator.
OBJECT

Search scope to use for the search request of the search validator.

Type
String
Default
OBJECT
Defined by
LdapValidatorProperties
cas.monitor.ldap[0].validator.search-filterSearch filter to use for the search request of the search validator.
(objectClass=*)

Search filter to use for the search request of the search validator.

Type
String
Default
(objectClass=*)
Defined by
LdapValidatorProperties
cas.monitor.ldap[0].validator.typeDetermine the LDAP validator type.
search

Determine the LDAP validator type.

The following LDAP validators can be used to test connection health status:
  • search: Validates a connection is healthy by performing a search operation. Validation is considered successful if the search result size is greater than zero.
  • none: No validation takes place.
  • compare: Validates a connection is healthy by performing a compare operation.
Type
String
Default
search
Defined by
LdapValidatorProperties

Required settings may be needed to activate or affect the feature; review them even when they have a default. Optional settings only need to be set to change a default or to turn on the behavior they control. Third party settings belong to libraries such as Spring Boot that CAS builds on; their own documentation may have more detail.

LDAP & Active Directory

LDAP Scriptable Search Filter

LDAP search filters can point to an external Groovy script to dynamically construct the final filter template.

The script itself may be designed as:

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import org.ldaptive.*
import org.springframework.context.*

def run(Object[] args) {
    def (filter,parameters,applicationContext,logger) = args

    logger.info("Configuring LDAP filter")
    filter.setFilter("uid=something")
}

The following parameters are passed to the script:

Parameter Description
filter FilterTemplate to be updated by the script and used for the LDAP query.
parameters Map of query parameters which may be used to construct the final filter.
applicationContext Reference to the Spring ApplicationContext reference.
logger The object responsible for issuing log messages such as logger.info(...).

To prepare CAS to support and integrate with Apache Groovy, please review this guide.

Notes on configuration

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, especially if defined CAS settings cannot be recognized or validated by the configuration schema. Additional validation processes are also handled via Configuration Metadata and property migrations applied automatically on startup by Spring Boot and family.

Indexed Settings

CAS settings able to accept multiple values are typically documented with an index, such as cas.some.setting[0]=value. The index [0] is meant to be incremented by the adopter to allow for distinct multiple configuration blocks.

health
Third-party endpoint2 operationsExposed by default
1

Turn the endpoint on and expose it over the web. One entry covers every operation. By default only info, health and status are exposed.

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management.endpoint.health.access=UNRESTRICTED
management.endpoints.web.exposure.include=health

Endpoints may be mapped to other paths. For example, to serve health at healthcheck:

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management.endpoints.web.path-mapping.health=healthcheck