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Terraform module that creates an S3 bucket with an optional IAM user for external CI/CD systems

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Cloud Posse

This module creates an S3 bucket with support of versioning, encryption, ACL and bucket object policy. If user_enabled variable is set to true, the module will provision a basic IAM user with permissions to access the bucket.

This basic IAM system user is suitable for CI/CD systems (e.g. TravisCI, CircleCI) or systems which are external to AWS that cannot leverage AWS IAM Instance Profiles.

We do not recommend creating IAM users this way for any other purpose.

It blocks public access to the bucket by default. https://docs.aws.amazon.com/AmazonS3/latest/dev/access-control-block-public-access.html


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.

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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.

Using a canned ACL.

module "s3_bucket" {
  source = "cloudposse/s3-bucket/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  acl                      = "private"
  enabled                  = true
  user_enabled             = true
  versioning_enabled       = false
  allowed_bucket_actions   = ["s3:GetObject", "s3:ListBucket", "s3:GetBucketLocation"]
  name                     = "app"
  stage                    = "test"
  namespace                = "eg"
}

Using grants to enable access to another account and for logging.

module "s3_bucket" {
  source = "cloudposse/s3-bucket/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  acl                      = ""
  enabled                  = true
  user_enabled             = true
  versioning_enabled       = false
  allowed_bucket_actions   = ["s3:GetObject", "s3:ListBucket", "s3:GetBucketLocation"]
  name                     = "app"
  stage                    = "test"
  namespace                = "eg"

  grants = [
    {
      id          = "012abc345def678ghi901" # Canonical user or account id
      type        = "CanonicalUser"
      permissions = ["FULL_CONTROL"]
      uri         = null
    },
    {
      id          = null
      type        = "Group"
      permissions = ["READ", "WRITE"]
      uri         = "http://acs.amazonaws.com/groups/s3/LogDelivery"
    },
  ]
}

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code
  test/%                              Run Terraform commands in the examples/complete folder; e.g. make test/plan

Requirements

Name Version
terraform >= 0.13.0
aws >= 2.33

Providers

Name Version
aws >= 2.33

Modules

Name Source Version
s3_user cloudposse/iam-s3-user/aws 0.15.2
this cloudposse/label/null 0.24.1

Resources

Name Type
aws_iam_policy.replication resource
aws_iam_role.replication resource
aws_iam_role_policy_attachment.replication resource
aws_s3_bucket.default resource
aws_s3_bucket_policy.default resource
aws_s3_bucket_public_access_block.default resource
aws_iam_policy_document.aggregated_policy data source
aws_iam_policy_document.bucket_policy data source
aws_iam_policy_document.replication data source
aws_iam_policy_document.replication_sts 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
acl The canned ACL to apply. We recommend private to avoid exposing sensitive information. Conflicts with grants. string "private" no
additional_tag_map Additional tags for appending to tags_as_list_of_maps. Not added to tags. map(string) {} no
allow_encrypted_uploads_only Set to true to prevent uploads of unencrypted objects to S3 bucket bool false 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 false no
allowed_bucket_actions List of actions the user is permitted to perform on the S3 bucket list(string)
[
"s3:PutObject",
"s3:PutObjectAcl",
"s3:GetObject",
"s3:DeleteObject",
"s3:ListBucket",
"s3:ListBucketMultipartUploads",
"s3:GetBucketLocation",
"s3:AbortMultipartUpload"
]
no
attributes Additional attributes (e.g. 1) 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_name Bucket name. If provided, the bucket will be created with this name instead of generating the name from the context string null 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,
"enabled": true,
"environment": null,
"id_length_limit": null,
"label_key_case": null,
"label_order": [],
"label_value_case": null,
"name": null,
"namespace": null,
"regex_replace_chars": null,
"stage": null,
"tags": {}
}
no
cors_rule_inputs Specifies the allowed headers, methods, origins and exposed headers when using CORS on this bucket
list(object({
allowed_headers = list(string)
allowed_methods = list(string)
allowed_origins = list(string)
expose_headers = list(string)
max_age_seconds = number
}))
null 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
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
force_destroy A boolean string 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
grants An ACL policy grant. Conflicts with acl. Set acl to null to use this.
list(object({
id = string
type = string
permissions = list(string)
uri = string
}))
null no
id_length_limit Limit id to this many characters (minimum 6).
Set to 0 for unlimited length.
Set to null for default, which is 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 The letter case of label keys (tag names) (i.e. name, namespace, environment, stage, attributes) to use in tags.
Possible values: lower, title, upper.
Default value: title.
string null 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
label_value_case The letter case of output label values (also used in tags and id).
Possible values: lower, title, upper and none (no transformation).
Default value: lower.
string null no
lifecycle_rules A list of lifecycle rules
list(object({
prefix = string
enabled = bool
tags = map(string)

enable_glacier_transition = bool
enable_deeparchive_transition = bool
enable_standard_ia_transition = bool
enable_current_object_expiration = bool

abort_incomplete_multipart_upload_days = number
noncurrent_version_glacier_transition_days = number
noncurrent_version_deeparchive_transition_days = number
noncurrent_version_expiration_days = number

standard_transition_days = number
glacier_transition_days = number
deeparchive_transition_days = number
expiration_days = number
}))
[
{
"abort_incomplete_multipart_upload_days": 90,
"deeparchive_transition_days": 90,
"enable_current_object_expiration": true,
"enable_deeparchive_transition": false,
"enable_glacier_transition": true,
"enable_standard_ia_transition": false,
"enabled": false,
"expiration_days": 90,
"glacier_transition_days": 60,
"noncurrent_version_deeparchive_transition_days": 60,
"noncurrent_version_expiration_days": 90,
"noncurrent_version_glacier_transition_days": 30,
"prefix": "",
"standard_transition_days": 30,
"tags": {}
}
]
no
logging Bucket access logging configuration.
object({
bucket_name = string
prefix = 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
object_lock_configuration A configuration for S3 object locking. With S3 Object Lock, you can store objects using a write once, read many (WORM) model. Object Lock can help prevent objects from being deleted or overwritten for a fixed amount of time or indefinitely.
object({
mode = string # Valid values are GOVERNANCE and COMPLIANCE.
days = number
years = number
})
null 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 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
replication_rules Specifies the replication rules if S3 bucket replication is enabled list(any) null no
restrict_public_buckets Set to false to disable the restricting of making the bucket public bool true no
s3_replica_bucket_arn The ARN of the S3 replica bucket (destination) string "" no
s3_replication_enabled Set this to true and specify s3_replica_bucket_arn to enable replication. versioning_enabled must also be true. bool false no
sse_algorithm The server-side encryption algorithm to use. Valid values are AES256 and aws:kms string "AES256" no
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
user_enabled Set to true to create an IAM user with permission to access the bucket bool false no
versioning_enabled A state of versioning. Versioning is a means of keeping multiple variants of an object in the same bucket bool true no

Outputs

Name Description
access_key_id The access key ID
bucket_arn Bucket ARN
bucket_domain_name FQDN of bucket
bucket_id Bucket Name (aka ID)
bucket_region Bucket region
bucket_regional_domain_name The bucket region-specific domain name
enabled Is module enabled
secret_access_key The secret access key. This will be written to the state file in plain-text
user_arn The ARN assigned by AWS for the user
user_enabled Is user creation enabled
user_name Normalized IAM user name
user_unique_id The user unique ID assigned by AWS

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Copyright

Copyright © 2017-2021 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,
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Contributors

Erik Osterman
Erik Osterman
Andriy Knysh
Andriy Knysh
Maxim Mironenko
Maxim Mironenko
Josh Myers
Josh Myers

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Terraform module that creates an S3 bucket with an optional IAM user for external CI/CD systems

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