Terraform module to provision an S3 bucket with built in policy to allow CloudTrail logs.

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.

The module supports the following:

1. Forced server-side encryption at rest for the S3 bucket
2. S3 bucket versioning to easily recover from both unintended user actions and application failures
3. S3 bucket is protected from deletion if it's not empty (force_destroy set to false)

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Usage

module "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     = "prod"
  name      = "cluster"
}

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
terraform	>= 1.3.0
aws	>= 3.0

Providers

Name	Version
aws	>= 3.0

Modules

Name	Source	Version
access_log_bucket_name	cloudposse/label/null	0.25.0
s3_access_log_bucket	cloudposse/s3-log-storage/aws	1.4.3
s3_bucket	cloudposse/s3-log-storage/aws	1.4.3
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_iam_policy_document.default	data source
aws_partition.current	data source

Inputs

Name	Description	Type	Default	Required
abort_incomplete_multipart_upload_days	Maximum time (in days) that you want to allow multipart uploads to remain in progress	number	5	no
access_log_bucket_name	Name of the S3 bucket where s3 access log will be sent to	string	""	no
acl	The canned ACL to apply. We recommend log-delivery-write for compatibility with AWS services	string	"log-delivery-write"	no
additional_tag_map	Additional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id. This is for some rare cases where resources want additional configuration of tags and therefore take a list of maps with tag key, value, and additional configuration.	map(string)	{}	no
allow_ssl_requests_only	Set to true to require requests to use Secure Socket Layer (HTTPS/SSL). This will explicitly deny access to HTTP requests	bool	true	no
attributes	ID element. Additional attributes (e.g. workers or cluster) to add to id, in the order they appear in the list. New attributes are appended to the end of the list. The elements of the list are joined by the delimiter and treated as a single ID element.	list(string)	[]	no
block_public_acls	Set to false to disable the blocking of new public access lists on the bucket	bool	true	no
block_public_policy	Set to false to disable the blocking of new public policies on the bucket	bool	true	no
bucket_notifications_enabled	Send notifications for the object created events. Used for 3rd-party log collection from a bucket. This does not affect access log bucket created by this module. To enable bucket notifications on the access log bucket, create it separately using the cloudposse/s3-log-storage/aws	bool	false	no
bucket_notifications_prefix	Prefix filter. Used to manage object notifications	string	""	no
bucket_notifications_type	Type of the notification configuration. Only SQS is supported.	string	"SQS"	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.	any	{ "additional_tag_map": {}, "attributes": [], "delimiter": null, "descriptor_formats": {}, "enabled": true, "environment": null, "id_length_limit": null, "label_key_case": null, "label_order": [], "label_value_case": null, "labels_as_tags": [ "unset" ], "name": null, "namespace": null, "regex_replace_chars": null, "stage": null, "tags": {}, "tenant": null }	no
create_access_log_bucket	A flag to indicate if a bucket for s3 access logs should be created	bool	false	no
delimiter	Delimiter to be used between ID elements. Defaults to - (hyphen). Set to "" to use no delimiter at all.	string	null	no
descriptor_formats	Describe additional descriptors to be output in the descriptors output map. Map of maps. Keys are names of descriptors. Values are maps of the form {<br/> format = string<br/> labels = list(string)<br/>} (Type is any so the map values can later be enhanced to provide additional options.) format is a Terraform format string to be passed to the format() function. labels is a list of labels, in order, to pass to format() function. Label values will be normalized before being passed to format() so they will be identical to how they appear in id. Default is {} (descriptors output will be empty).	any	{}	no
enable_glacier_transition	Glacier transition might just increase your bill. Set to false to disable lifecycle transitions to AWS Glacier.	bool	false	no
enabled	Set to false to prevent the module from creating any resources	bool	null	no
environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	string	null	no
expiration_days	Number of days after which to expunge the objects	number	90	no
force_destroy	(Optional, Default:false ) A boolean that indicates all objects should be deleted from the bucket so that the bucket can be destroyed without error. These objects are not recoverable	bool	false	no
glacier_transition_days	Number of days after which to move the data to the glacier storage tier	number	60	no
id_length_limit	Limit id to this many characters (minimum 6). Set to 0 for unlimited length. Set to null for keep the existing setting, which defaults to 0. Does not affect id_full.	number	null	no
ignore_public_acls	Set to false to disable the ignoring of public access lists on the bucket	bool	true	no
kms_master_key_arn	The AWS KMS master key ARN used for the SSE-KMS encryption. This can only be used when you set the value of sse_algorithm as aws:kms. The default aws/s3 AWS KMS master key is used if this element is absent while the sse_algorithm is aws:kms	string	""	no
label_key_case	Controls the letter case of the tags keys (label names) for tags generated by this module. Does not affect keys of tags passed in via the tags input. Possible values: lower, title, upper. Default value: title.	string	null	no
label_order	The order in which the labels (ID elements) appear in the id. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.	list(string)	null	no
label_value_case	Controls the letter case of ID elements (labels) as included in id, set as tag values, and output by this module individually. Does not affect values of tags passed in via the tags input. Possible values: lower, title, upper and none (no transformation). Set this to title and set delimiter to "" to yield Pascal Case IDs. Default value: lower.	string	null	no
labels_as_tags	Set of labels (ID elements) to include as tags in the tags output. Default is to include all labels. Tags with empty values will not be included in the tags output. Set to [] to suppress all generated tags. Notes: The value of the name tag, if included, will be the id, not the name. Unlike other null-label inputs, the initial setting of labels_as_tags cannot be changed in later chained modules. Attempts to change it will be silently ignored.	set(string)	[ "default" ]	no
lifecycle_prefix	Prefix filter. Used to manage object lifecycle events	string	""	no
lifecycle_rule_enabled	Enable lifecycle events on this bucket	bool	true	no
lifecycle_tags	Tags filter. Used to manage object lifecycle events	map(string)	{}	no
name	ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'. This is the only ID element not also included as a tag. The "name" tag is set to the full id string. There is no tag with the value of the name input.	string	null	no
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
noncurrent_version_expiration_days	Specifies when noncurrent object versions expire	number	90	no
noncurrent_version_transition_days	Specifies when noncurrent object versions transitions	number	30	no
policy	A valid bucket policy JSON document. Note that if the policy document is not specific enough (but still valid), Terraform may view the policy as constantly changing in a terraform plan. In this case, please make sure you use the verbose/specific version of the policy	string	""	no
regex_replace_chars	Terraform regular expression (regex) string. Characters matching the regex will be removed from the ID elements. If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.	string	null	no
restrict_public_buckets	Set to false to disable the restricting of making the bucket public	bool	true	no
sse_algorithm	The server-side encryption algorithm to use. Valid values are AES256 and aws:kms	string	"AES256"	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	string	null	no
standard_transition_days	Number of days to persist in the standard storage tier before moving to the infrequent access tier	number	30	no
tags	Additional tags (e.g. {'BusinessUnit': 'XYZ'}). Neither the tag keys nor the tag values will be modified by this module.	map(string)	{}	no
tenant	ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for	string	null	no
versioning_enabled	A state of versioning. Versioning is a means of keeping multiple variants of an object in the same bucket	bool	false	no

Outputs

Name	Description
bucket_arn	Bucket ARN
bucket_domain_name	FQDN of bucket
bucket_id	Bucket ID
bucket_notifications_sqs_queue_arn	Notifications SQS queue ARN
prefix	Prefix configured for lifecycle rules

Related Projects

Check out these related projects.

• terraform-aws-cloudtrail - Terraform module to provision an AWS CloudTrail and an encrypted S3 bucket with versioning to store CloudTrail logs
• terraform-aws-cloudtrail-cloudwatch-alarms - Terraform module for creating alarms for tracking important changes and occurances from cloudtrail.
• 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
• terraform-aws-cloudtrail-s3-bucket - S3 bucket with built in IAM policy to allow CloudTrail logs

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Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

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