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Terraform module to provision an AWS CloudTrail.

The module accepts an encrypted S3 bucket with versioning to store CloudTrail logs.

The bucket could be from the same AWS account or from a different account.

This is useful if an organization uses a number of separate AWS accounts to isolate the Audit environment from other environments (production, staging, development).

In this case, you create CloudTrail in the production environment (production AWS account), while the S3 bucket to store the CloudTrail logs is created in the Audit AWS account, restricting access to the logs only to the users/groups from the Audit account.

[!TIP]

πŸ‘½ Use Atmos with Terraform

Cloud Posse uses atmos to easily orchestrate multiple environments using Terraform. <br/> Works with Github Actions, Atlantis, or Spacelift.

<details> <summary><strong>Watch demo of using Atmos with Terraform</strong></summary> <img src="https://github.com/cloudposse/atmos/blob/master/docs/demo.gif?raw=true"/><br/> <i>Example of running <a href="https://atmos.tools"><code>atmos</code></a> to manage infrastructure from our <a href="https://atmos.tools/quick-start/">Quick Start</a> tutorial.</i> </detalis>

Usage

module "cloudtrail" {
  source = "cloudposse/cloudtrail/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace                     = "eg"
  stage                         = "dev"
  name                          = "cluster"
  enable_log_file_validation    = true
  include_global_service_events = true
  is_multi_region_trail         = false
  enable_logging                = true
  s3_bucket_name                = "my-cloudtrail-logs-bucket"
}

NOTE: To create an S3 bucket for CloudTrail logs, use terraform-aws-cloudtrail-s3-bucket module. It creates an S3 bucket and an IAM policy to allow CloudTrail logs.

module "cloudtrail" {
  source = "cloudposse/cloudtrail/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace                     = "eg"
  stage                         = "dev"
  name                          = "cluster"
  enable_log_file_validation    = true
  include_global_service_events = true
  is_multi_region_trail         = false
  enable_logging                = true
  s3_bucket_name                = module.cloudtrail_s3_bucket.bucket_id
}

module "cloudtrail_s3_bucket" {
  source = "cloudposse/cloudtrail-s3-bucket/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace = "eg"
  stage     = "dev"
  name      = "cluster"
}

For a complete example, see examples/complete.

[!IMPORTANT] In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

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Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

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Requirements

NameVersion
<a name="requirement_terraform"></a> terraform>= 1.3.0
<a name="requirement_aws"></a> aws>= 3.0

Providers

NameVersion
<a name="provider_aws"></a> aws>= 3.0

Modules

NameSourceVersion
<a name="module_this"></a> thiscloudposse/label/null0.25.0

Resources

NameType
aws_cloudtrail.defaultresource

Inputs

NameDescriptionTypeDefaultRequired
<a name="input_additional_tag_map"></a> additional_tag_mapAdditional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id.<br/>This is for some rare cases where resources want additional configuration of tags<br/>and therefore take a list of maps with tag key, value, and additional configuration.map(string){}no
<a name="input_advanced_event_selector"></a> advanced_event_selectorSpecifies an advanced event selector for enabling data event logging. See: https://www.terraform.io/docs/providers/aws/r/cloudtrail.html for details on this variable<pre>list(object({<br/> name = optional(string)<br/> field_selector = list(object({<br/> field = string<br/> ends_with = optional(list(string))<br/> not_ends_with = optional(list(string))<br/> equals = optional(list(string))<br/> not_equals = optional(list(string))<br/> starts_with = optional(list(string))<br/> not_starts_with = optional(list(string))<br/> }))<br/> }))</pre>[]no
<a name="input_attributes"></a> attributesID element. Additional attributes (e.g. workers or cluster) to add to id,<br/>in the order they appear in the list. New attributes are appended to the<br/>end of the list. The elements of the list are joined by the delimiter<br/>and treated as a single ID element.list(string)[]no
<a name="input_cloud_watch_logs_group_arn"></a> cloud_watch_logs_group_arnSpecifies a log group name using an Amazon Resource Name (ARN), that represents the log group to which CloudTrail logs will be deliveredstring""no
<a name="input_cloud_watch_logs_role_arn"></a> cloud_watch_logs_role_arnSpecifies the role for the CloudWatch Logs endpoint to assume to write to a user’s log groupstring""no
<a name="input_context"></a> contextSingle object for setting entire context at once.<br/>See description of individual variables for details.<br/>Leave string and numeric variables as null to use default value.<br/>Individual variable settings (non-null) override settings in context object,<br/>except for attributes, tags, and additional_tag_map, which are merged.any<pre>{<br/> "additional_tag_map": {},<br/> "attributes": [],<br/> "delimiter": null,<br/> "descriptor_formats": {},<br/> "enabled": true,<br/> "environment": null,<br/> "id_length_limit": null,<br/> "label_key_case": null,<br/> "label_order": [],<br/> "label_value_case": null,<br/> "labels_as_tags": [<br/> "unset"<br/> ],<br/> "name": null,<br/> "namespace": null,<br/> "regex_replace_chars": null,<br/> "stage": null,<br/> "tags": {},<br/> "tenant": null<br/>}</pre>no
<a name="input_delimiter"></a> delimiterDelimiter to be used between ID elements.<br/>Defaults to - (hyphen). Set to "" to use no delimiter at all.stringnullno
<a name="input_descriptor_formats"></a> descriptor_formatsDescribe additional descriptors to be output in the descriptors output map.<br/>Map of maps. Keys are names of descriptors. Values are maps of the form<br/>{<br/> format = string<br/> labels = list(string)<br/>}<br/>(Type is any so the map values can later be enhanced to provide additional options.)<br/>format is a Terraform format string to be passed to the format() function.<br/>labels is a list of labels, in order, to pass to format() function.<br/>Label values will be normalized before being passed to format() so they will be<br/>identical to how they appear in id.<br/>Default is {} (descriptors output will be empty).any{}no
<a name="input_enable_log_file_validation"></a> enable_log_file_validationSpecifies whether log file integrity validation is enabled. Creates signed digest for validated contents of logsbooltrueno
<a name="input_enable_logging"></a> enable_loggingEnable logging for the trailbooltrueno
<a name="input_enabled"></a> enabledSet to false to prevent the module from creating any resourcesboolnullno
<a name="input_environment"></a> environmentID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'stringnullno
<a name="input_event_selector"></a> event_selectorSpecifies an event selector for enabling data event logging. See: https://www.terraform.io/docs/providers/aws/r/cloudtrail.html for details on this variable<pre>list(object({<br/> include_management_events = bool<br/> read_write_type = string<br/> exclude_management_event_sources = optional(set(string))<br/><br/> data_resource = list(object({<br/> type = string<br/> values = list(string)<br/> }))<br/> }))</pre>[]no
<a name="input_id_length_limit"></a> id_length_limitLimit id to this many characters (minimum 6).<br/>Set to 0 for unlimited length.<br/>Set to null for keep the existing setting, which defaults to 0.<br/>Does not affect id_full.numbernullno
<a name="input_include_global_service_events"></a> include_global_service_eventsSpecifies whether the trail is publishing events from global services such as IAM to the log filesboolfalseno
<a name="input_insight_selector"></a> insight_selectorSpecifies an insight selector for type of insights to log on a trail<pre>list(object({<br/> insight_type = string<br/> }))</pre>[]no
<a name="input_is_multi_region_trail"></a> is_multi_region_trailSpecifies whether the trail is created in the current region or in all regionsbooltrueno
<a name="input_is_organization_trail"></a> is_organization_trailThe trail is an AWS Organizations trailboolfalseno
<a name="input_kms_key_arn"></a> kms_key_arnSpecifies the KMS key ARN to use to encrypt the logs delivered by CloudTrailstring""no
<a name="input_label_key_case"></a> label_key_caseControls the letter case of the tags keys (label names) for tags generated by this module.<br/>Does not affect keys of tags passed in via the tags input.<br/>Possible values: lower, title, upper.<br/>Default value: title.stringnullno
<a name="input_label_order"></a> label_orderThe order in which the labels (ID elements) appear in the id.<br/>Defaults to ["namespace", "environment", "stage", "name", "attributes"].<br/>You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.list(string)nullno
<a name="input_label_value_case"></a> label_value_caseControls the letter case of ID elements (labels) as included in id,<br/>set as tag values, and output by this module individually.<br/>Does not affect values of tags passed in via the tags input.<br/>Possible values: lower, title, upper and none (no transformation).<br/>Set this to title and set delimiter to "" to yield Pascal Case IDs.<br/>Default value: lower.stringnullno
<a name="input_labels_as_tags"></a> labels_as_tagsSet of labels (ID elements) to include as tags in the tags output.<br/>Default is to include all labels.<br/>Tags with empty values will not be included in the tags output.<br/>Set to [] to suppress all generated tags.<br/>Notes:<br/> The value of the name tag, if included, will be the id, not the name.<br/> Unlike other null-label inputs, the initial setting of labels_as_tags cannot be<br/> changed in later chained modules. Attempts to change it will be silently ignored.set(string)<pre>[<br/> "default"<br/>]</pre>no
<a name="input_name"></a> nameID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.<br/>This is the only ID element not also included as a tag.<br/>The "name" tag is set to the full id string. There is no tag with the value of the name input.stringnullno
<a name="input_namespace"></a> namespaceID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally uniquestringnullno
<a name="input_regex_replace_chars"></a> regex_replace_charsTerraform regular expression (regex) string.<br/>Characters matching the regex will be removed from the ID elements.<br/>If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.stringnullno
<a name="input_s3_bucket_name"></a> s3_bucket_nameS3 bucket name for CloudTrail logsstringn/ayes
<a name="input_s3_key_prefix"></a> s3_key_prefixPrefix for S3 bucket used by Cloudtrail to store logsstringnullno
<a name="input_sns_topic_name"></a> sns_topic_nameSpecifies the name of the Amazon SNS topic defined for notification of log file deliverystringnullno
<a name="input_stage"></a> stageID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'stringnullno
<a name="input_tags"></a> tagsAdditional tags (e.g. {'BusinessUnit': 'XYZ'}).<br/>Neither the tag keys nor the tag values will be modified by this module.map(string){}no
<a name="input_tenant"></a> tenantID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is forstringnullno

Outputs

NameDescription
<a name="output_cloudtrail_arn"></a> cloudtrail_arnThe Amazon Resource Name of the trail
<a name="output_cloudtrail_home_region"></a> cloudtrail_home_regionThe region in which the trail was created
<a name="output_cloudtrail_id"></a> cloudtrail_idThe ID of the trail. (Name for provider < v5, ARN for provider >= v5).
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Related Projects

Check out these related projects.

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✨ Contributing

This project is under active development, and we encourage contributions from our community.

Many thanks to our outstanding contributors:

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For πŸ› bug reports & feature requests, please use the issue tracker.

In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.

  1. Review our Code of Conduct and Contributor Guidelines.
  2. Fork the repo on GitHub
  3. Clone the project to your own machine
  4. Commit changes to your own branch
  5. Push your work back up to your fork
  6. Submit a Pull Request so that we can review your changes

NOTE: Be sure to merge the latest changes from "upstream" before making a pull request!

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<details> <summary>Preamble to the Apache License, Version 2.0</summary> <br/> <br/>

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