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Cloud Posse

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)

This project is part of our comprehensive "SweetOps" approach towards DevOps.

Terraform Open Source Modules

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!

Security & Compliance

Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance.

Benchmark Description
Infrastructure Security Infrastructure Security Compliance
CIS KUBERNETES Center for Internet Security, KUBERNETES Compliance
CIS AWS Center for Internet Security, AWS Compliance
CIS AZURE Center for Internet Security, AZURE Compliance
PCI-DSS Payment Card Industry Data Security Standards Compliance
NIST-800-53 National Institute of Standards and Technology Compliance
ISO27001 Information Security Management System, ISO/IEC 27001 Compliance
SOC2 Service Organization Control 2 Compliance
CIS GCP Center for Internet Security, GCP Compliance
HIPAA Health Insurance Portability and Accountability Compliance

Usage

IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions. We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise.

Also, because of a bug in the Terraform registry (hashicorp/terraform#21417), the registry shows many of our inputs as required when in fact they are optional. The table below correctly indicates which inputs are required.

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"
}

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 >= 1.0.0
aws >= 3.0

Providers

Name Version
aws >= 3.0

Modules

Name Source Version
access_log_label cloudposse/label/null 0.25.0
s3_access_log_bucket cloudposse/s3-log-storage/aws 0.26.0
s3_bucket cloudposse/s3-log-storage/aws 0.26.0
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

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

Copyright

Copyright © 2017-2022 Cloud Posse, LLC

License

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
under the License.

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About

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Contributors

Andriy Knysh
Andriy Knysh

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