Elastic Integration filter plugin v0.1.9

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  • Plugin version: v0.1.9
  • Released on: 2024-05-14
  • Changelog

For other versions, see the overview list.

To learn more about Logstash, see the Logstash Reference.

Getting help

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For questions about the plugin, open a topic in the Discuss forums. For bugs or feature requests, open an issue in Github. For the list of Elastic supported plugins, please consult the Elastic Support Matrix.

Description

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Use this filter to process Elastic integrations powered by Elasticsearch Ingest Node in Logstash.

When you configure this filter to point to an Elasticsearch cluster, it detects which ingest pipeline (if any) should be executed for each event, using an explicitly-defined pipeline_name or auto-detecting the event’s data-stream and its default pipeline.

It then loads that pipeline’s definition from Elasticsearch and run that pipeline inside Logstash without transmitting the event to Elasticsearch. Events that are successfully handled by their ingest pipeline will have [@metadata][target_ingest_pipeline] set to _none so that any downstream Elasticsearch output in the Logstash pipeline will avoid running the event’s default pipeline again in Elasticsearch.

Some multi-pipeline configurations such as logstash-to-logstash over http(s) do not maintain the state of [@metadata] fields. In these setups, you may need to explicitly configure your downstream pipeline’s Elasticsearch output with pipeline => "_none" to avoid re-running the default pipeline.

Events that fail ingest pipeline processing will be tagged with _ingest_pipeline_failure, and their [@metadata][_ingest_pipeline_failure] will be populated with details as a key/value map.

This plugin requires minimum Java 17 and Logstash 8.7.0 versions.

Minimum Configuration

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You will need to configure this plugin to connect to Elasticsearch, and may need to also need to provide local GeoIp databases.

filter {
  elastic_integration {
    cloud_id   => "YOUR_CLOUD_ID_HERE"
    cloud_auth => "YOUR_CLOUD_AUTH_HERE"
    geoip_database_directory => "/etc/your/geoip-databases"
  }
}

Read on for a guide to configuration, or jump to the complete list of configuration options.

Connecting to Elasticsearch

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This plugin communicates with Elasticsearch to identify which ingest pipeline should be run for a given event, and to retrieve the ingest pipeline definitions themselves. You must configure this plugin to point to Elasticsearch using exactly one of:

  • A Cloud Id (see cloud_id)
  • A list of one or more host URLs (see hosts)

Communication will be made securely over SSL unless you explicitly configure this plugin otherwise.

You may need to configure how this plugin establishes trust of the server that responds, and will likely need to configure how this plugin presents its own identity or credentials.

SSL Trust Configuration

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When communicating over SSL, this plugin fully-validates the proof-of-identity presented by Elasticsearch using the system trust store. You can provide an alternate source of trust with one of:

You can also configure which aspects of the proof-of-identity are verified (see ssl_verification_mode).

SSL Identity Configuration

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When communicating over SSL, you can also configure this plugin to present a certificate-based proof-of-identity to the Elasticsearch cluster it connects to using one of:

Request Identity

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You can configure this plugin to present authentication credentials to Elasticsearch in one of several ways:

Your request credentials are only as secure as the connection they are being passed over. They provide neither privacy nor secrecy on their own, and can easily be recovered by an adversary when SSL is disabled.

Minimum required privileges

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This plugin communicates with Elasticsearch to resolve events into pipeline definitions and needs to be configured with credentials with appropriate privileges to read from the relevant APIs. At the startup phase, this plugin confirms that current user has sufficient privileges, including:

Privilege name Description

monitor

A read-only privilege for cluster operations such as cluster health or state. Plugin requires it when checks Elasticsearch license.

read_pipeline

A read-only get and simulate access to ingest pipeline. It is required when plugin reads Elasticsearch ingest pipeline definitions.

manage_index_templates

All operations on index templates privilege. It is required when plugin resolves default pipeline based on event data stream name.

This plugin cannot determine if an anonymous user has the required privileges when it connects to an Elasticsearch cluster that has security features disabled or when the user does not provide credentials. The plugin starts in an unsafe mode with a runtime error indicating that API permissions are insufficient, and prevents events from being processed by the ingest pipeline.

To avoid these issues, set up user authentication and ensure that security in Elasticsearch is enabled (default).

Supported Ingest Processors

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This filter can run Elasticsearch Ingest Node pipelines that are wholly comprised of the supported subset of processors. It has access to the Painless and Mustache scripting engines where applicable:

Source Processor Caveats

Ingest Common

append

none

bytes

none

communityid

none

convert

none

csv

none

date

none

dateindexname

none

dissect

none

dotexpander

none

drop

none

fail

none

fingerprint

none

foreach

none

grok

none

gsub

none

htmlstrip

none

join

none

json

none

keyvalue

none

lowercase

none

networkdirection

none

pipeline

resolved pipeline must be wholly-composed of supported processors

registereddomain

none

remove

none

rename

none

reroute

none

script

lang must be painless (default)

set

none

sort

none

split

none

trim

none

uppercase

none

uri_parts

none

urldecode

none

user_agent

side-loading a custom regex file is not supported; the processor will use the default user agent definitions as specified in Elasticsearch processor definition

Redact

redact

none

GeoIp

geoip

requires MaxMind GeoIP2 databases, which may be provided by Logstash’s Geoip Database Management OR configured using geoip_database_directory

Field Mappings

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During execution the Ingest pipeline works with a temporary mutable view of the Logstash event called an ingest document. This view contains all of the as-structured fields from the event with minimal type conversions.

It also contains additional metadata fields as required by ingest pipeline processors:

  • _version: a long-value integer equivalent to the event’s @version, or a sensible default value of 1.
  • _ingest.timestamp: a ZonedDateTime equivalent to the event’s @timestamp field

After execution completes the event is sanitized to ensure that Logstash-reserved fields have the expected shape, providing sensible defaults for any missing required fields. When an ingest pipeline has set a reserved field to a value that cannot be coerced, the value is made available in an alternate location on the event as described below.

Logstash field type value

@timestamp

Timestamp

First coercible value of the ingest document’s @timestamp, event.created, _ingest.timestamp, or _now fields; or the current timestamp. When the ingest document has a value for @timestamp that cannot be coerced, it will be available in the event’s _@timestamp field.

@version

String-encoded integer

First coercible value of the ingest document’s @version, or _version fields; or the current timestamp. When the ingest document has a value for @version that cannot be coerced, it will be available in the event’s _@version field.

@metadata

key/value map

The ingest document’s @metadata; or an empty map. When the ingest document has a value for @metadata that cannot be coerced, it will be available in the event’s _@metadata field.

tags

a String or a list of Strings

The ingest document’s tags. When the ingest document has a value for tags that cannot be coerced, it will be available in the event’s _tags field.

Additionally, these Elasticsearch IngestDocument Metadata fields are made available on the resulting event if-and-only-if they were set during pipeline execution:

Elasticsearch document metadata Logstash field

_id

[@metadata][_ingest_document][id]

_index

[@metadata][_ingest_document][index]

_routing

[@metadata][_ingest_document][routing]

_version

[@metadata][_ingest_document][version]

_version_type

[@metadata][_ingest_document][version_type]

_ingest.timestamp

[@metadata][_ingest_document][timestamp]

Resolving Pipeline Definitions

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This plugin uses Elasticsearch to resolve pipeline names into their pipeline definitions. When configured without an explicit pipeline_name, or when a pipeline uses the Reroute Processor, it also uses Elasticsearch to establish mappings of data stream names to their respective default pipeline names.

It uses hit/miss caches to avoid querying Elasticsearch for every single event. It also works to update these cached mappings before they expire. The result is that when Elasticsearch is responsive this plugin is able to pick up changes quickly without impacting its own performance, and it can survive periods of Elasticsearch issues without interruption by continuing to use potentially-stale mappings or definitions.

To achieve this, mappings are cached for a maximum of 24 hours, and cached values are reloaded every 1 minute with the following effect:

  • when a reloaded mapping is non-empty and is the same as its already-cached value, its time-to-live is reset to ensure that subsequent events can continue using the confirmed-unchanged value
  • when a reloaded mapping is non-empty and is different from its previously-cached value, the entry is updated so that subsequent events will use the new value
  • when a reloaded mapping is newly empty, the previous non-empty mapping is replaced with a new empty entry so that subsequent events will use the empty value
  • when the reload of a mapping fails, this plugin emits a log warning but the existing cache entry is unchanged and gets closer to its expiry.

Elastic Integration Filter Configuration Options

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This plugin supports the following configuration options plus the Common options described later.

api_key

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  • Value type is password
  • There is no default value for this setting.

The encoded form of an API key that is used to authenticate this plugin to Elasticsearch.

cloud_auth

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  • Value type is password
  • There is no default value for this setting.

Cloud authentication string ("<username>:<password>" format) is an alternative for the username/password pair and can be obtained from Elastic Cloud web console.

cloud_id

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  • Value type is string
  • There is no default value for this setting.
  • Cannot be combined with `ssl_enabled⇒false`.

Cloud Id, from the Elastic Cloud web console.

When connecting with a Cloud Id, communication to Elasticsearch is secured with SSL.

For more details, check out the Logstash-to-Cloud documentation.

geoip_database_directory

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  • Value type is path
  • There is no default value for this setting.

When running in a Logstash process that has Geoip Database Management enabled, integrations that use the Geoip Processor wil use managed Maxmind databases by default. By using managed databases you accept and agree to the MaxMind EULA.

You may instead configure this plugin with the path to a local directory containing database files.

Databases are registered by file name, and most integrations rely on databases being present named:

  • GeoLite2-ASN.mmdb
  • GeoLite2-City.mmdb
  • GeoLite2-Country.mmdb

This plugin will discover any regular file with the .mmdb suffix in the provided directory, and expects the files it finds to be in the MaxMind DB format.

hosts

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  • Value type is a list of uris
  • There is no default value for this setting.
  • Constraints:

    • When any URL contains a protocol component, all URLs must have the same protocol as each other.
    • https-protocol hosts use HTTPS and cannot be combined with ssl_enabled => false.
    • http-protocol hosts use unsecured HTTP and cannot be combined with ssl_enabled => true.
    • When any URL omits a port component, the default 9200 is used.
    • When any URL contains a path component, all URLs must have the same path as each other.

A non-empty list of Elasticsearch hosts to connect.

Examples:

  • "127.0.0.1"
  • ["127.0.0.1:9200","127.0.0.2:9200"]
  • ["http://127.0.0.1"]
  • ["https://127.0.0.1:9200"]
  • ["https://127.0.0.1:9200/subpath"] (If using a proxy on a subpath)

When connecting with a list of hosts, communication to Elasticsearch is secured with SSL unless configured otherwise.

Disabling SSL is dangerous

The security of this plugin relies on SSL to avoid leaking credentials and to avoid running illegitimate ingest pipeline definitions.

There are two ways to disable SSL:

  • Provide a list of http-protocol hosts
  • Set <<{version}-plugins-{type}s-{plugin}-ssl_enabled>>=>false

password

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  • Value type is password
  • There is no default value for this setting.
  • Required when request auth is configured with username

A password when using HTTP Basic Authentication to connect to Elasticsearch.

pipeline_name

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  • Value type is string
  • There is no default value for this setting.
  • When present, the event’s initial pipeline will not be auto-detected from the event’s data stream fields.
  • Value may be a sprintf-style template; if any referenced fields cannot be resolved the event will not be routed to an ingest pipeline.

ssl_certificate

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  • Value type is path
  • There is no default value for this setting.
  • When present, ssl_key and ssl_key_passphrase are also required.
  • Cannot be combined with configurations that disable SSL

Path to a PEM-encoded certificate or certificate chain with which to identify this plugin to Elasticsearch.

ssl_certificate_authorities

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  • Value type is a list of paths
  • There is no default value for this setting.
  • Cannot be combined with configurations that disable SSL
  • Cannot be combined with `ssl_verification_mode⇒none`.

One or more PEM-formatted files defining certificate authorities.

This setting can be used to override the system trust store for verifying the SSL certificate presented by Elasticsearch.

ssl_enabled

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  • Value type is boolean
  • There is no default value for this setting.

Secure SSL communication to Elasticsearch is enabled unless:

  • it is explicitly disabled with ssl_enabled => false; OR
  • it is implicitly disabled by providing http-protocol hosts.

Specifying ssl_enabled => true can be a helpful redundant safeguard to ensure this plugin cannot be configured to use non-ssl communication.

ssl_key

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  • Value type is path
  • There is no default value for this setting.
  • Required when connection identity is configured with ssl_certificate
  • Cannot be combined with configurations that disable SSL

A path to a PKCS8-formatted SSL certificate key.

ssl_keystore_password

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  • Value type is password
  • There is no default value for this setting.
  • Required when connection identity is configured with ssl_keystore_path
  • Cannot be combined with configurations that disable SSL

Password for the ssl_keystore_path.

ssl_keystore_path

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  • Value type is path
  • There is no default value for this setting.
  • When present, ssl_keystore_password is also required.
  • Cannot be combined with configurations that disable SSL

A path to a JKS- or PKCS12-formatted keystore with which to identify this plugin to Elasticsearch.

ssl_key_passphrase

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  • Value type is password
  • There is no default value for this setting.
  • Required when connection identity is configured with ssl_certificate
  • Cannot be combined with configurations that disable SSL

A password or passphrase of the ssl_key.

ssl_truststore_path

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A path to JKS- or PKCS12-formatted keystore where trusted certificates are located.

This setting can be used to override the system trust store for verifying the SSL certificate presented by Elasticsearch.

ssl_truststore_password

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  • Value type is password
  • There is no default value for this setting.
  • Required when connection trust is configured with ssl_truststore_path
  • Cannot be combined with configurations that disable SSL

Password for the ssl_truststore_path.

ssl_verification_mode

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  • Value type is string
  • There is no default value for this setting.
  • Cannot be combined with configurations that disable SSL

Level of verification of the certificate provided by Elasticsearch.

SSL certificates presented by Elasticsearch are fully-validated by default.

  • Available modes:

    • none: performs no validation, implicitly trusting any server that this plugin connects to (insecure)
    • certificate: validates the server-provided certificate is signed by a trusted certificate authority and that the server can prove possession of its associated private key (less secure)
    • full (default): performs the same validations as certificate and also verifies that the provided certificate has an identity claim matching the server we are attempting to connect to (most secure)

username

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  • Value type is string
  • There is no default value for this setting.
  • When present, password is also required.

A user name when using HTTP Basic Authentication to connect to Elasticsearch.

 

Common options

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These configuration options are supported by all filter plugins:

add_field

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  • Value type is hash
  • Default value is {}

If this filter is successful, add any arbitrary fields to this event. Field names can be dynamic and include parts of the event using the %{field}.

Example:

    filter {
      elastic_integration {
        add_field => { "foo_%{somefield}" => "Hello world, from %{host}" }
      }
    }
    # You can also add multiple fields at once:
    filter {
      elastic_integration {
        add_field => {
          "foo_%{somefield}" => "Hello world, from %{host}"
          "new_field" => "new_static_value"
        }
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would add field foo_hello if it is present, with the value above and the %{host} piece replaced with that value from the event. The second example would also add a hardcoded field.

add_tag

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  • Value type is array
  • Default value is []

If this filter is successful, add arbitrary tags to the event. Tags can be dynamic and include parts of the event using the %{field} syntax.

Example:

    filter {
      elastic_integration {
        add_tag => [ "foo_%{somefield}" ]
      }
    }
    # You can also add multiple tags at once:
    filter {
      elastic_integration {
        add_tag => [ "foo_%{somefield}", "taggedy_tag"]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would add a tag foo_hello (and the second example would of course add a taggedy_tag tag).

enable_metric

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  • Value type is boolean
  • Default value is true

Disable or enable metric logging for this specific plugin instance by default we record all the metrics we can, but you can disable metrics collection for a specific plugin.

  • Value type is string
  • There is no default value for this setting.

Add a unique ID to the plugin configuration. If no ID is specified, Logstash will generate one. It is strongly recommended to set this ID in your configuration. This is particularly useful when you have two or more plugins of the same type, for example, if you have 2 elastic_integration filters. Adding a named ID in this case will help in monitoring Logstash when using the monitoring APIs.

    filter {
      elastic_integration {
        id => "ABC"
      }
    }

periodic_flush

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  • Value type is boolean
  • Default value is false

Call the filter flush method at regular interval. Optional.

remove_field

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  • Value type is array
  • Default value is []

If this filter is successful, remove arbitrary fields from this event. Fields names can be dynamic and include parts of the event using the %{field} Example:

    filter {
      elastic_integration {
        remove_field => [ "foo_%{somefield}" ]
      }
    }
    # You can also remove multiple fields at once:
    filter {
      elastic_integration {
        remove_field => [ "foo_%{somefield}", "my_extraneous_field" ]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would remove the field with name foo_hello if it is present. The second example would remove an additional, non-dynamic field.

remove_tag

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  • Value type is array
  • Default value is []

If this filter is successful, remove arbitrary tags from the event. Tags can be dynamic and include parts of the event using the %{field} syntax.

Example:

    filter {
      elastic_integration {
        remove_tag => [ "foo_%{somefield}" ]
      }
    }
    # You can also remove multiple tags at once:
    filter {
      elastic_integration {
        remove_tag => [ "foo_%{somefield}", "sad_unwanted_tag"]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would remove the tag foo_hello if it is present. The second example would remove a sad, unwanted tag as well.