Awesome

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]

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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.

Makefile Targets

Available targets:

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

Requirements

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

Providers

Name	Version
<a name="provider_aws"></a> aws	>= 3.0

Modules

Name	Source	Version
<a name="module_this"></a> this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_cloudtrail.default	resource

Inputs

Name	Description	Type	Default	Required
<a name="input_additional_tag_map"></a> additional_tag_map	Additional 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_selector	Specifies 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> attributes	ID 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_arn	Specifies a log group name using an Amazon Resource Name (ARN), that represents the log group to which CloudTrail logs will be delivered	`string`	`""`	no
<a name="input_cloud_watch_logs_role_arn"></a> cloud_watch_logs_role_arn	Specifies the role for the CloudWatch Logs endpoint to assume to write to a user’s log group	`string`	`""`	no
<a name="input_context"></a> context	Single 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> delimiter	Delimiter to be used between ID elements.<br/>Defaults to `-` (hyphen). Set to `""` to use no delimiter at all.	`string`	`null`	no
<a name="input_descriptor_formats"></a> descriptor_formats	Describe 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_validation	Specifies whether log file integrity validation is enabled. Creates signed digest for validated contents of logs	`bool`	`true`	no
<a name="input_enable_logging"></a> enable_logging	Enable logging for the trail	`bool`	`true`	no
<a name="input_enabled"></a> enabled	Set to false to prevent the module from creating any resources	`bool`	`null`	no
<a name="input_environment"></a> environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	`string`	`null`	no
<a name="input_event_selector"></a> event_selector	Specifies 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_limit	Limit `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`.	`number`	`null`	no
<a name="input_include_global_service_events"></a> include_global_service_events	Specifies whether the trail is publishing events from global services such as IAM to the log files	`bool`	`false`	no
<a name="input_insight_selector"></a> insight_selector	Specifies 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_trail	Specifies whether the trail is created in the current region or in all regions	`bool`	`true`	no
<a name="input_is_organization_trail"></a> is_organization_trail	The trail is an AWS Organizations trail	`bool`	`false`	no
<a name="input_kms_key_arn"></a> kms_key_arn	Specifies the KMS key ARN to use to encrypt the logs delivered by CloudTrail	`string`	`""`	no
<a name="input_label_key_case"></a> label_key_case	Controls 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`.	`string`	`null`	no
<a name="input_label_order"></a> label_order	The 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)`	`null`	no
<a name="input_label_value_case"></a> label_value_case	Controls 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`.	`string`	`null`	no
<a name="input_labels_as_tags"></a> labels_as_tags	Set 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> name	ID 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.	`string`	`null`	no
<a name="input_namespace"></a> namespace	ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique	`string`	`null`	no
<a name="input_regex_replace_chars"></a> regex_replace_chars	Terraform 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.	`string`	`null`	no
<a name="input_s3_bucket_name"></a> s3_bucket_name	S3 bucket name for CloudTrail logs	`string`	n/a	yes
<a name="input_s3_key_prefix"></a> s3_key_prefix	Prefix for S3 bucket used by Cloudtrail to store logs	`string`	`null`	no
<a name="input_sns_topic_name"></a> sns_topic_name	Specifies the name of the Amazon SNS topic defined for notification of log file delivery	`string`	`null`	no
<a name="input_stage"></a> stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	`string`	`null`	no
<a name="input_tags"></a> tags	Additional 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> tenant	ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for	`string`	`null`	no

Outputs

Name	Description
<a name="output_cloudtrail_arn"></a> cloudtrail_arn	The Amazon Resource Name of the trail
<a name="output_cloudtrail_home_region"></a> cloudtrail_home_region	The region in which the trail was created
<a name="output_cloudtrail_id"></a> cloudtrail_id	The ID of the trail. (Name for provider < v5, ARN for provider >= v5).

Related Projects

Check out these related projects.

terraform-aws-cloudtrail-cloudwatch-alarms - Terraform module for creating alarms for tracking important changes and occurances from cloudtrail.
terraform-aws-cloudtrail-s3-bucket - S3 bucket with built in IAM policy to allow CloudTrail logs
terraform-aws-s3-log-storage - This module creates an S3 bucket suitable for receiving logs from other AWS services such as S3, CloudFront, and CloudTrail

[!TIP]

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