terraform-aws-cloudtrail

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.

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It's 100% Open Source and licensed under the APACHE2.

We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!

Usage

IMPORTANT: The master branch is used in source just as an example. In your code, do not pin to master because there may be breaking changes between releases. Instead pin to the release tag (e.g. ?ref=tags/x.y.z) of one of our latest releases.

module "cloudtrail" {
  source                        = "git::https://github.com/cloudposse/terraform-aws-cloudtrail.git?ref=master"
  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                        = "git::https://github.com/cloudposse/terraform-aws-cloudtrail.git?ref=master"
  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    = "git::https://github.com/cloudposse/terraform-aws-cloudtrail-s3-bucket.git?ref=master"
  namespace = "eg"
  stage     = "dev"
  name      = "cluster"
}

For a complete example, see examples/complete.

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
terraform	>= 0.12.0
aws	>= 2.0
local	>= 1.2
null	>= 2.0

Providers

Name	Version
aws	>= 2.0

Inputs

Name	Description	Type	Default	Required
additional_tag_map	Additional tags for appending to tags_as_list_of_maps. Not added to tags.	map(string)	{}	no
attributes	Additional attributes (e.g. 1)	list(string)	[]	no
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
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
context	Single object for setting entire context at once. See description of individual variables for details. Leave string and numeric variables as null to use default value. Individual variable settings (non-null) override settings in context object, except for attributes, tags, and additional_tag_map, which are merged.	object({ enabled = bool namespace = string environment = string stage = string name = string delimiter = string attributes = list(string) tags = map(string) additional_tag_map = map(string) regex_replace_chars = string label_order = list(string) id_length_limit = number })	{ "additional_tag_map": {}, "attributes": [], "delimiter": null, "enabled": true, "environment": null, "id_length_limit": null, "label_order": [], "name": null, "namespace": null, "regex_replace_chars": null, "stage": null, "tags": {} }	no
delimiter	Delimiter to be used between namespace, environment, stage, name and attributes. Defaults to - (hyphen). Set to "" to use no delimiter at all.	string	null	no
enable_log_file_validation	Specifies whether log file integrity validation is enabled. Creates signed digest for validated contents of logs	bool	true	no
enable_logging	Enable logging for the trail	bool	true	no
enabled	Set to false to prevent the module from creating any resources	bool	null	no
environment	Environment, e.g. 'uw2', 'us-west-2', OR 'prod', 'staging', 'dev', 'UAT'	string	null	no
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	list(object({ include_management_events = bool read_write_type = string data_resource = list(object({ type = string values = list(string) })) }))	[]	no
id_length_limit	Limit id to this many characters. Set to 0 for unlimited length. Set to null for default, which is 0. Does not affect id_full.	number	null	no
include_global_service_events	Specifies whether the trail is publishing events from global services such as IAM to the log files	bool	false	no
is_multi_region_trail	Specifies whether the trail is created in the current region or in all regions	bool	false	no
is_organization_trail	The trail is an AWS Organizations trail	bool	false	no
kms_key_arn	Specifies the KMS key ARN to use to encrypt the logs delivered by CloudTrail	string	""	no
label_order	The naming order of the id output and Name tag. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 5 elements, but at least one must be present.	list(string)	null	no
name	Solution name, e.g. 'app' or 'jenkins'	string	null	no
namespace	Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp'	string	null	no
regex_replace_chars	Regex to replace chars with empty string in namespace, environment, stage and name. If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.	string	null	no
s3_bucket_name	S3 bucket name for CloudTrail logs	string	n/a	yes
stage	Stage, e.g. 'prod', 'staging', 'dev', OR 'source', 'build', 'test', 'deploy', 'release'	string	null	no
tags	Additional tags (e.g. map('BusinessUnit','XYZ')	map(string)	{}	no

Outputs

Name	Description
cloudtrail_arn	The Amazon Resource Name of the trail
cloudtrail_home_region	The region in which the trail was created
cloudtrail_id	The name of the trail

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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

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Copyright

Copyright © 2017-2020 Cloud Posse, LLC

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
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Contributors

Erik Osterman	Andriy Knysh	Sergey Vasilyev	Valeriy	Jamie Nelson