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Terraform module to provision Service Control Policies (SCP) for AWS Organizations, Organizational Units, and AWS accounts

Home Page: https://cloudposse.com/accelerate

License: Apache License 2.0

Makefile 13.76% HCL 73.59% Go 12.65%
scp service-control-policies service-control-policy iam organization organizational-units compliance terraform terraform-modules

terraform-aws-service-control-policies's Introduction

terraform-aws-service-control-policies

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Terraform module to provision Service Control Policies (SCP) for AWS Organizations, Organizational Units, and AWS accounts.

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Introduction

Service Control Policies are configured in YAML configuration files.

We maintain a comprehensive catalog of SCP configurations and welcome contributions via pull request!

The example in this module uses the catalog to provision the SCPs on AWS.

The policies in the catalog/*-templates files require parameters supplied via the parameters input to terraform-yaml-config.

Usage

For a complete example, see examples/complete.

For automated tests of the complete example using bats and Terratest (which tests and deploys the example on Datadog), see test.

  module "yaml_config" {
    source = "cloudposse/config/yaml"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"

    list_config_local_base_path = path.module
    list_config_paths           = ["catalog/*.yaml"]

    context = module.this.context
  }

  module "yaml_config_with_parameters" {
    source = "cloudposse/config/yaml"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"

    list_config_local_base_path = path.module
    list_config_paths           = ["https://raw.githubusercontent.com/cloudposse/terraform-aws-service-control-policies/0.12.0/catalog/s3-templates/DenyS3InNonSelectedRegion.yaml"]

    parameters = {
      "s3_regions_lockdown" = "us-*,eu-north-1"
      }

    context = module.this.context
  }

  data "aws_caller_identity" "this" {}

  module "service_control_policies" {
    source = "../../"

    service_control_policy_statements  = concat(module.yaml_config.list_configs, module.yaml_config_with_parameters.list_configs)
    service_control_policy_description = var.service_control_policy_description
    target_id                          = data.aws_caller_identity.this.account_id

    context = module.this.context
  }

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.

Examples

Review the complete example to see how to use this module.

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
aws >= 3.0
local >= 1.3

Providers

Name Version
aws >= 3.0

Modules

Name Source Version
this cloudposse/label/null 0.25.0

Resources

Name Type
aws_organizations_policy.this resource
aws_organizations_policy_attachment.this resource
aws_iam_policy_document.this data source

Inputs

Name Description Type Default Required
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
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
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
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
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
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
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
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
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
service_control_policy_description Description of the combined Service Control Policy string null no
service_control_policy_statements List of Service Control Policy statements any n/a yes
stage ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' string null 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
target_id The unique identifier (ID) of the organization root, organizational unit, or account number that you want to attach the policy to string n/a yes
tenant ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for string null no

Outputs

Name Description
organizations_policy_arn Amazon Resource Name (ARN) of the policy
organizations_policy_id The unique identifier of the policy

Related Projects

Check out these related projects.

References

For additional context, refer to some of these links.

  • Service control policies - Service control policies (SCPs) are a type of organization policy that you can use to manage permissions in your organization.
  • Example service control policies - Examples of Service Control Policies (SCPs).
  • SCP syntax - Service control policies (SCPs) use a similar syntax to that used by AWS Identity and Access Management (IAM) permission policies and resource-based policies.
  • Terraform Standard Module Structure - HashiCorp's standard module structure is a file and directory layout we recommend for reusable modules distributed in separate repositories.
  • Terraform Module Requirements - HashiCorp's guidance on all the requirements for publishing a module. Meeting the requirements for publishing a module is extremely easy.
  • Terraform random_integer Resource - The resource random_integer generates random values from a given range, described by the min and max attributes of a given resource.
  • Terraform Version Pinning - The required_version setting can be used to constrain which versions of the Terraform CLI can be used with your configuration
  • SCPs size limits - The SCP have a size limit and creating many policies at once can result in a POLICY_CONTENT_LIMIT_EXCEEDED error

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✨ Contributing

This project is under active development, and we encourage contributions from our community.

Many thanks to our outstanding contributors:

For πŸ› bug reports & feature requests, please use the issue tracker.

In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.

  1. Review our Code of Conduct and Contributor Guidelines.
  2. Fork the repo on GitHub
  3. Clone the project to your own machine
  4. Commit changes to your own branch
  5. Push your work back up to your fork
  6. Submit a Pull Request so that we can review your changes

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

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License

License

Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

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.

Trademarks

All other trademarks referenced herein are the property of their respective owners.

Copyrights

Copyright Β© 2020-2024 Cloud Posse, LLC

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terraform-aws-service-control-policies's Issues

Dependency Dashboard

This issue lists Renovate updates and detected dependencies. Read the Dependency Dashboard docs to learn more.

This repository currently has no open or pending branches.

Detected dependencies

terraform
versions.tf
  • hashicorp/terraform >= 0.13.0
  • aws >= 3.0
  • local >= 1.3

  • Check this box to trigger a request for Renovate to run again on this repository

SCPs DenyEC2NonNitroInstances and DenyEC2InstancesWithoutEncryptionInTransit are too big

Describe the Bug

The SCPs in catalog/ec2-policies.yaml are too big. There is a limit of 5120 characters to a Service Control Policy.

  • DenyEC2NonNitroInstances is 8325 characters when converted to compact JSON
  • DenyEC2InstancesWithoutEncryptionInTransit is 5231 characters when converted to compact JSON

Nitro vs Encryption in Transit

There was an assumption, possibly based on AWS documentation, that all Nitro instances automatically performed encryption of network traffic. This is not the case (at least not now). For example. The a1 instances are Nitro but do not support Encryption in Transit. This should be pointed out in the description of DenyEC2NonNitroInstances, because some people may be using it as a proxy for DenyEC2InstancesWithoutEncryptionInTransit.

References:

Expected Behavior

SCPs should be valid, including being of an acceptable size.

Steps to Reproduce

Try to deploy the SCP

Screenshots

No response

Environment

No response

Additional Context

DenyEC2NonNitroInstances

My investigation indicates that all sizes of any instance type are either all Nitro or all non-Nitro, so the DenyEC2NonNitroInstances can be shortened by using wildcards instead of listing all sizes.

DenyEC2InstancesWithoutEncryptionInTransit

My investigation found that, at least currently, all sizes of any instance type either all do or do not support Encryption in Transit, so the DenyEC2InstancesWithoutEncryptionInTransit can be shortened by using wildcards instead of listing all sizes.

Some global services are denied by region control policies

Describe the Bug

The 2 region restriction templates (which limit which regions you can make requests to) my exempt all the global services (e.g iam) which will not have regions. Although the templates seem to be based on official AWS Documentation the documentation notes that the example does not include all the latest services.

At a minimum, supportplans:* needs to be added. Ideally, find and use an up-to-date list of global services.

Expected Behavior

Accounts with the RestrictToSpecifiedRegions SCP should still be able to see and change AWS Support plans, and perform any other functions that are not regionally scoped.

Steps to Reproduce

  • Enable the RestrictToSpecifiedRegions SCP
  • Attempt to view and change your AWS support plan via the AWS Console

Screenshots

No response

Environment

SCP version 0.14.0

Additional Context

No response

Policy to Prevent S3 Buckets and Objects from Allowing Public Access

Have a question? Please checkout our Slack Community or visit our Slack Archive.

Slack Community

Describe the Feature

Current

Current policy will deny DeletePublicAccessBlock and PutBucketPublicAccessBlock

- sid: "DenyS3BucketsPublicAccess"
effect: "Deny"
actions:
- "s3:PutBucketPublicAccessBlock"
- "s3:DeletePublicAccessBlock"
resources:
- "*"

This is similar to https://asecure.cloud/a/scp_s3_block_public_access/

Proposed

This policy https://asecure.cloud/a/s3_deny_public/ will deny adding public grants on objects using PutObjectAcl and PutObject denies.

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