Uh oh!
There was an error while loading.Please reload this page.
- Notifications
You must be signed in to change notification settings - Fork878
Terraform module that creates an S3 bucket with an optional IAM user for external CI/CD systems
License
cloudposse/terraform-aws-s3-bucket
Folders and files
| Name | Name | Last commit message | Last commit date | |
|---|---|---|---|---|
Repository files navigation
This module creates an S3 bucket with support for versioning, lifecycles, object locks, replication, encryption, ACL,bucket object policies, and static website hosting.
For backward compatibility, it sets the S3 bucket ACL toprivate and thes3_object_ownershiptoObjectWriter. Moving forward, settings3_object_ownership toBucketOwnerEnforced is recommended,and doing so automatically disables the ACL.
This module blocks public access to the bucket by default. Seeblock_public_acls,block_public_policy,ignore_public_acls, andrestrict_public_buckets to change the settings. SeeAWS documentationfor more details.
This module can optionally create an IAM User with access to the S3 bucket. This is inherently insecure in thatto enable anyone to become the User, access keys must be generated, and anything generated by Terraform is storedunencrypted in the Terraform state. See theTerraform documentation for more details
The best way to grant access to the bucket is to grant one or more IAM Roles access to the bucket viaprivileged_principal_arns.This IAM Role can be assumed by EC2 instances via their Instance Profile, or Kubernetes (EKS) services usingIRSA.Entities outside of AWS can assume the Role viaOIDC.(Seethis example of connecting GitHubto enable GitHub actions to assume AWS IAM roles, or usethis Cloud Posse componentif you are already using the Cloud Posse reference architecture.)
If neither of those approaches work, then as a last resort you can setuser_enabled = true andthis module will provision a basic IAM user with permissions to access the bucket.We do not recommend creating IAM users this way for any other purpose.
If an IAM user is created, the IAM user name is constructed usingterraform-null-labeland some input is required. The simplest input isname. By default the name will be converted to lower caseand all non-alphanumeric characters except for hyphen will be removed. See the documentation forterraform-null-labelto learn how to override these defaults if desired.
If an AWS Access Key is created, it is stored either in SSM Parameter Store or is provided as a module output,but not both. Using SSM Parameter Store is recommended because that will keep the secret from being easily accessiblevia Terraform remote state lookup, but the key will still be stored unencrypted in the Terraform state in any case.
Tip
Cloud Posse usesatmos to easily orchestrate multiple environments using Terraform.
Works withGithub Actions,Atlantis, orSpacelift.
Watch demo of using Atmos with Terraform

Example of running
atmos to manage infrastructure from ourQuick Start tutorial.UsingBucketOwnerEnforced
module"s3_bucket" {source="cloudposse/s3-bucket/aws"# Cloud Posse recommends pinning every module to a specific version# version = "x.x.x"name="app"stage="test"namespace="eg"s3_object_ownership="BucketOwnerEnforced"enabled=trueuser_enabled=falseversioning_enabled=falseprivileged_principal_actions=["s3:GetObject","s3:ListBucket","s3:GetBucketLocation"]privileged_principal_arns=[ { (local.deployment_iam_role_arn)= [""] }, { (local.additional_deployment_iam_role_arn)= ["prefix1/","prefix2/"] } ]}
Configuring S3storage lifecycle:
locals {lifecycle_configuration_rules=[{ enabled=true# bool id="v2rule" abort_incomplete_multipart_upload_days=1# number filter_and=null expiration= { days=120# integer > 0 } noncurrent_version_expiration= { newer_noncurrent_versions=3# integer > 0 noncurrent_days=60# integer >= 0 } transition= [{ days=30# integer >= 0 storage_class="STANDARD_IA"# string/enum, one of GLACIER, STANDARD_IA, ONEZONE_IA, INTELLIGENT_TIERING, DEEP_ARCHIVE, GLACIER_IR. }, { days=60# integer >= 0 storage_class="ONEZONE_IA"# string/enum, one of GLACIER, STANDARD_IA, ONEZONE_IA, INTELLIGENT_TIERING, DEEP_ARCHIVE, GLACIER_IR. }] noncurrent_version_transition= [{ newer_noncurrent_versions=3# integer >= 0 noncurrent_days=30# integer >= 0 storage_class="ONEZONE_IA"# string/enum, one of GLACIER, STANDARD_IA, ONEZONE_IA, INTELLIGENT_TIERING, DEEP_ARCHIVE, GLACIER_IR. }] }]}
Allowing specific principal ARNs to perform actions on the bucket:
module"s3_bucket" {source="cloudposse/s3-bucket/aws"# Cloud Posse recommends pinning every module to a specific version# version = "x.x.x"s3_object_ownership="BucketOwnerEnforced"enabled=trueuser_enabled=trueversioning_enabled=falseallowed_bucket_actions=["s3:GetObject","s3:ListBucket","s3:GetBucketLocation"]name="app"stage="test"namespace="eg"privileged_principal_arns=[ {"arn:aws:iam::123456789012:role/principal1"= ["prefix1/","prefix2/"] }, {"arn:aws:iam::123456789012:role/principal2"= [""] }]privileged_principal_actions=["s3:PutObject","s3:PutObjectAcl","s3:GetObject","s3:DeleteObject","s3:ListBucket","s3:ListBucketMultipartUploads","s3:GetBucketLocation","s3:AbortMultipartUpload" ]}
Important
In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentationand the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact versionyou're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematicapproach for updating versions to avoid unexpected changes.
| Name | Version |
|---|---|
| terraform | >= 1.3.0 |
| aws | >= 4.9.0 |
| time | >= 0.7 |
| Name | Version |
|---|---|
| aws | >= 4.9.0 |
| time | >= 0.7 |
| Name | Source | Version |
|---|---|---|
| s3_user | cloudposse/iam-s3-user/aws | 1.2.0 |
| this | cloudposse/label/null | 0.25.0 |
| Name | Description | Type | Default | Required |
|---|---|---|---|---|
| access_key_enabled | Set totrue to create an IAM Access Key for the created IAM user | bool | true | no |
| acl | Thecanned ACL to apply. Deprecated by AWS in favor of bucket policies. Automatically disabled if s3_object_ownership is set to "BucketOwnerEnforced".Defaults to "private" for backwards compatibility, but we recommend setting s3_object_ownership to "BucketOwnerEnforced" instead. | string | "private" | no |
| additional_tag_map | Additional key-value pairs to add to each map intags_as_list_of_maps. Not added totags orid.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_encrypted_uploads_only | Set totrue to prevent uploads of unencrypted objects to S3 bucket | bool | false | no |
| allow_ssl_requests_only | Set totrue 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) | [ | no |
| attributes | ID element. Additional attributes (e.g.workers orcluster) to add toid,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 delimiterand treated as a single ID element. | list(string) | [] | no |
| availability_zone_id | The ID of the availability zone. | string | "" | no |
| block_public_acls | Set tofalse to disable the blocking of new public access lists on the bucket | bool | true | no |
| block_public_policy | Set tofalse to disable the blocking of new public policies on the bucket | bool | true | no |
| bucket_key_enabled | Set this to true to use Amazon S3 Bucket Keys for SSE-KMS, which may or may not reduce the number of AWS KMS requests. For more information, see:https://docs.aws.amazon.com/AmazonS3/latest/userguide/bucket-key.html | bool | false | 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 | { | no |
| cors_configuration | Specifies the allowed headers, methods, origins and exposed headers when using CORS on this bucket | list(object({ | [] | no |
| create_s3_directory_bucket | Control the creation of the S3 directory bucket. Set to true to create the bucket, false to skip. | 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 thedescriptors 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 theformat() function.labels is a list of labels, in order, to pass toformat() function.Label values will be normalized before being passed to format() so they will beidentical to how they appear in id.Default is {} (descriptors output will be empty). | any | {} | 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 |
| event_notification_details | S3 event notification details | object({ | { | no |
| expected_bucket_owner | Account ID of the expected bucket owner. More information:https://docs.aws.amazon.com/AmazonS3/latest/userguide/bucket-owner-condition.html | string | null | no |
| force_destroy | Whentrue, permits a non-empty S3 bucket to be deleted by first deleting all objects in the bucket.THESE OBJECTS ARE NOT RECOVERABLE even if they were versioned and stored in Glacier. | bool | false | no |
| grants | A list of policy grants for the bucket, taking a list of permissions. Conflicts with acl. Setacl tonull to use this.Deprecated by AWS in favor of bucket policies. Automatically disabled if s3_object_ownership is set to "BucketOwnerEnforced". | list(object({ | [] | no |
| id_length_limit | Limitid to this many characters (minimum 6).Set to 0 for unlimited length.Set to null for keep the existing setting, which defaults to0.Does not affect id_full. | number | null | no |
| ignore_public_acls | Set tofalse 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 theSSE-KMS encryption. This can only be used when you set the value ofsse_algorithm asaws:kms. The default aws/s3 AWS KMS master key is used if this element is absent while thesse_algorithm isaws:kms | string | "" | no |
| label_key_case | Controls the letter case of thetags 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 theid.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 inid,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 andnone (no transformation).Set this to title and setdelimiter 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 thetags 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 theid, not thename.Unlike other null-label inputs, the initial setting oflabels_as_tags cannot bechanged in later chained modules. Attempts to change it will be silently ignored. | set(string) | [ | no |
| lifecycle_configuration_rules | A list of lifecycle V2 rules | list(object({ | [] | no |
| lifecycle_rule_ids | DEPRECATED (uselifecycle_configuration_rules): A list of IDs to assign to correspondinglifecycle_rules | list(string) | [] | no |
| lifecycle_rules | DEPRECATED (use lifecycle_configuration_rules): A list of lifecycle rules | list(object({ | null | no |
| logging | Bucket access logging configuration. Empty list for no logging, list of 1 to enable logging. | list(object({ | [] | no |
| minimum_tls_version | Set the minimum TLS version for in-transit traffic | string | null | 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 thename 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 |
| object_lock_configuration | A configuration for S3 object locking. With S3 Object Lock, you can store objects using awrite 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({ | null | no |
| privileged_principal_actions | List of actions to permitprivileged_principal_arns to perform on bucket and bucket prefixes (seeprivileged_principal_arns) | list(string) | [] | no |
| privileged_principal_arns | List of maps. Each map has a key, an IAM Principal ARN, whose associated value is a list of S3 path prefixes to grant privileged_principal_actions permissions for that principal,in addition to the bucket itself, which is automatically included. Prefixes should not begin with '/'. | list(map(list(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 |
| replication_rules | DEPRECATED (uses3_replication_rules): Specifies the replication rules for S3 bucket replication if enabled. You must also set s3_replication_enabled to true. | list(any) | null | no |
| restrict_public_buckets | Set tofalse to disable the restricting of making the bucket public | bool | true | no |
| s3_object_ownership | Specifies the S3 object ownership control. Valid values are ObjectWriter,BucketOwnerPreferred, and 'BucketOwnerEnforced'.Defaults to "ObjectWriter" for backwards compatibility, but we recommend setting "BucketOwnerEnforced" instead. | string | "ObjectWriter" | no |
| s3_replica_bucket_arn | A single S3 bucket ARN to use for all replication rules. Note: The destination bucket can be specified in the replication rule itself (which allows for multiple destinations), in which case it will take precedence over this variable. | string | "" | no |
| s3_replication_enabled | Set this to true and specifys3_replication_rules to enable replication.versioning_enabled must also betrue. | bool | false | no |
| s3_replication_permissions_boundary_arn | Permissions boundary ARN for the created IAM replication role. | string | null | no |
| s3_replication_rules | Specifies the replication rules for S3 bucket replication if enabled. You must also set s3_replication_enabled to true. | list(object({ | null | no |
| s3_replication_source_roles | Cross-account IAM Role ARNs that will be allowed to perform S3 replication to this bucket (for replication within the same AWS account, it's not necessary to adjust the bucket policy). | list(string) | [] | no |
| s3_request_payment_configuration | S3 request payment configuration | object({ | { | no |
| source_ip_allow_list | List of IP addresses to allow to perform all actions to the bucket | list(string) | [] | no |
| source_policy_documents | List of IAM policy documents (in JSON) that are merged together into the exported document. Statements defined in source_policy_documents must have unique SIDs. Statement having SIDs that match policy SIDs generated by this module will override them. | list(string) | [] | no |
| sse_algorithm | The server-side encryption algorithm to use. Valid values areAES256 andaws:kms | string | "AES256" | no |
| ssm_base_path | The base path for SSM parameters where created IAM user's access key is stored | string | "/s3_user/" | no |
| stage | ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' | string | null | no |
| store_access_key_in_ssm | Set totrue to store the created IAM user's access key in SSM Parameter Store,false to store them in Terraform state as outputs.Since Terraform state would contain the secrets in plaintext, use of SSM Parameter Store is recommended. | bool | false | 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 |
| transfer_acceleration_enabled | Set this totrue to enable S3 Transfer Acceleration for the bucket.Note: When this is set to false Terraform does not perform drift detectionand will not disable Transfer Acceleration if it was enabled outside of Terraform. To disable it via Terraform, you must set this to true and then tofalse.Note: not all regions support Transfer Acceleration. | bool | false | no |
| user_enabled | Set totrue to create an IAM user with permission to access the bucket | bool | false | no |
| user_permissions_boundary_arn | Permission boundary ARN for the IAM user created to access the bucket. | 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 | true | no |
| website_configuration | Specifies the static website hosting configuration object | list(object({ | [] | no |
| website_redirect_all_requests_to | If provided, all website requests will be redirected to the specified host name and protocol | list(object({ | [] | no |
| Name | Description |
|---|---|
| access_key_id | The access key ID, ifvar.user_enabled && var.access_key_enabled.While sensitive, it does not need to be kept secret, so this is output regardless of var.store_access_key_in_ssm. |
| access_key_id_ssm_path | The SSM Path under which the S3 User's access key ID is stored |
| 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 |
| bucket_website_domain | The bucket website domain, if website is enabled |
| bucket_website_endpoint | The bucket website endpoint, if website is enabled |
| enabled | Is module enabled |
| replication_role_arn | The ARN of the replication IAM Role |
| secret_access_key | The secret access key will be output if created and not stored in SSM. However, the secret access key, if created, will be written to the Terraform state file unencrypted, regardless of any other settings. See theTerraform documentation for more details. |
| secret_access_key_ssm_path | The SSM Path under which the S3 User's secret access key is stored |
| 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 |
Check out these related projects.
- terraform-aws-cloudfront-s3-cdn - Terraform module to easily provision CloudFront CDN backed by an S3 origin
- terraform-aws-s3-website - Terraform Module for Creating S3 backed Websites and Route53 DNS
- terraform-aws-user-data-s3-backend - Terraform Module to Offload User Data to S3
- terraform-aws-s3-logs-athena-query - A Terraform module that creates an Athena Database and Structure for querying S3 access logs
- terraform-aws-lb-s3-bucket - Terraform module to provision an S3 bucket with built in IAM policy to allow AWS Load Balancers to ship access logs
- terraform-aws-s3-log-storage - Terraform module creates an S3 bucket suitable for receiving logs from other AWS services such as S3, CloudFront, and CloudTrail
Tip
Use Cloud Posse's ready-to-goterraform architecture blueprints for AWS to get up and running quickly.
✅ We build it together with your team.
✅ Your team owns everything.
✅ 100% Open Source and backed by fanatical support.
📚Learn More
Cloud Posse is the leadingDevOps Accelerator for funded startups and enterprises.
Your team can operate like a pro today.
Ensure that your team succeeds by using Cloud Posse's proven process and turnkey blueprints. Plus, we stick around until you succeed.
- Reference Architecture. You'll get everything you need from the ground up built using 100% infrastructure as code.
- Deployment Strategy. Adopt a proven deployment strategy with GitHub Actions, enabling automated, repeatable, and reliable software releases.
- Site Reliability Engineering. Gain total visibility into your applications and services with Datadog, ensuring high availability and performance.
- Security Baseline. Establish a secure environment from the start, with built-in governance, accountability, and comprehensive audit logs, safeguarding your operations.
- GitOps. Empower your team to manage infrastructure changes confidently and efficiently through Pull Requests, leveraging the full power of GitHub Actions.
- Training. Equip your team with the knowledge and skills to confidently manage the infrastructure, ensuring long-term success and self-sufficiency.
- Support. Benefit from a seamless communication over Slack with our experts, ensuring you have the support you need, whenever you need it.
- Troubleshooting. Access expert assistance to quickly resolve any operational challenges, minimizing downtime and maintaining business continuity.
- Code Reviews. Enhance your team’s code quality with our expert feedback, fostering continuous improvement and collaboration.
- Bug Fixes. Rely on our team to troubleshoot and resolve any issues, ensuring your systems run smoothly.
- Migration Assistance. Accelerate your migration process with our dedicated support, minimizing disruption and speeding up time-to-value.
- Customer Workshops. Engage with our team in weekly workshops, gaining insights and strategies to continuously improve and innovate.
This project is under active development, and we encourage contributions from our community.
Many thanks to our outstanding contributors:
For 🐛 bug reports & feature requests, please use theissue tracker.
In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.
- Review ourCode of Conduct andContributor Guidelines.
- Fork the repo on GitHub
- Clone the project to your own machine
- Commit changes to your own branch
- Push your work back up to your fork
- Submit aPull Request so that we can review your changes
NOTE: Be sure to merge the latest changes from "upstream" before making a pull request!
We useAtmos to streamline how Terraform tests are run. It centralizes configuration and wraps common test workflows with easy-to-use commands.
All tests are located in thetest/ folder.
Under the hood, tests are powered by Terratest together with our internalTest Helpers library, providing robust infrastructure validation.
Setup dependencies:
- Install Atmos (installation guide)
- Install Go1.24+ or newer
- Install Terraform or OpenTofu
To run tests:
- Run all tests:
atmostest run - Clean up test artifacts:
atmostest clean - Explore additional test options:
atmostest --help
The configuration for test commands is centrally managed. To review what's being imported, see theatmos.yaml file.
Learn more about ourautomated testing in our documentation or implementingcustom commands with atmos.
Join ourOpen Source Community on Slack. It'sFREE for everyone! Our "SweetOps" community is where you get to talk with others who share a similar vision for how to rollout and manage infrastructure. This is the best place to talk shop, ask questions, solicit feedback, and work together as a community to build totallysweet infrastructure.
Sign up forour newsletter and join 3,000+ DevOps engineers, CTOs, and founders who get insider access to the latest DevOps trends, so you can always stay in the know.Dropped straight into your Inbox every week — and usually a 5-minute read.
Join us every Wednesday via Zoom for your weekly dose of insider DevOps trends, AWS news and Terraform insights, all sourced from our SweetOps community, plus alive Q&A that you can’t find anywhere else.It'sFREE for everyone!
Preamble to the Apache License, Version 2.0
Complete license is available in theLICENSE file.
Licensed to the Apache Software Foundation (ASF) under oneor more contributor license agreements. See the NOTICE filedistributed with this work for additional informationregarding copyright ownership. The ASF licenses this fileto you under the Apache License, Version 2.0 (the"License"); you may not use this file except in compliancewith the License. You may obtain a copy of the License at https://www.apache.org/licenses/LICENSE-2.0Unless 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 ANYKIND, either express or implied. See the License for thespecific language governing permissions and limitationsunder the License.All other trademarks referenced herein are the property of their respective owners.
Copyright © 2017-2025Cloud Posse, LLC
About
Terraform module that creates an S3 bucket with an optional IAM user for external CI/CD systems
Topics
Resources
License
Code of conduct
Contributing
Security policy
Uh oh!
There was an error while loading.Please reload this page.
Stars
Watchers
Forks
Sponsor this project
Uh oh!
There was an error while loading.Please reload this page.
Packages0
Uh oh!
There was an error while loading.Please reload this page.

