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A Terraform module that creates IAM role with provided JSON IAM polices documents.

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Usage

This example creates a role with the name eg-prod-app with permission to grant read-write access to S3 bucket, and gives permission to the entities specified in principals_arns to assume the role.

data "aws_iam_policy_document" "resource_full_access" {
  statement {
    sid       = "FullAccess"
    effect    = "Allow"
    resources = ["arn:aws:s3:::bucketname/path/*"]

    actions = [
      "s3:PutObject",
      "s3:PutObjectAcl",
      "s3:GetObject",
      "s3:DeleteObject",
      "s3:ListBucket",
      "s3:ListBucketMultipartUploads",
      "s3:GetBucketLocation",
      "s3:AbortMultipartUpload"
    ]
  }
}

data "aws_iam_policy_document" "base" {
  statement {
    sid = "BaseAccess"

    actions = [
      "s3:ListBucket",
      "s3:ListBucketVersions"
    ]

    resources = ["arn:aws:s3:::bucketname"]
    effect    = "Allow"
  }
}

module "role" {
  source = "cloudposse/iam-role/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"

  enabled   = true
  namespace = "eg"
  stage     = "prod"
  name      = "app"

  policy_description = "Allow S3 FullAccess"
  role_description   = "IAM role with permissions to perform actions on S3 resources"

  principals = {
    AWS = ["arn:aws:iam::123456789012:role/workers"]
  }

  policy_documents = [
    data.aws_iam_policy_document.resource_full_access.json,
    data.aws_iam_policy_document.base.json
  ]
}

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

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 AWS), see test.

Requirements

Name Version
terraform >= 0.13.0
aws >= 2.0

Providers

Name Version
aws >= 2.0

Modules

Name Source Version
role_name cloudposse/label/null 0.25.0
this cloudposse/label/null 0.25.0

Resources

Name Type
aws_iam_instance_profile.default resource
aws_iam_policy.default resource
aws_iam_role.default resource
aws_iam_role_policy_attachment.default resource
aws_iam_role_policy_attachment.managed resource
aws_iam_policy_document.assume_role data source
aws_iam_policy_document.assume_role_aggregated data source
aws_iam_policy_document.default 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
assume_role_actions The IAM action to be granted by the AssumeRole policy list(string)
[
"sts:AssumeRole",
"sts:TagSession"
]
no
assume_role_conditions List of conditions for the assume role policy
list(object({
test = string
variable = string
values = list(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
instance_profile_enabled Create EC2 Instance Profile for the role bool false 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
managed_policy_arns List of managed policies to attach to created role set(string) [] no
max_session_duration The maximum session duration (in seconds) for the role. Can have a value from 1 hour to 12 hours number 3600 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
path Path to the role and policy. See IAM Identifiers for more information. string "/" no
permissions_boundary ARN of the policy that is used to set the permissions boundary for the role string "" no
policy_description The description of the IAM policy that is visible in the IAM policy manager string "" no
policy_document_count Number of policy documents (length of policy_documents list) number 1 no
policy_documents List of JSON IAM policy documents list(string) [] no
policy_name The name of the IAM policy that is visible in the IAM policy manager string null no
principals Map of service name as key and a list of ARNs to allow assuming the role as value (e.g. map(AWS, list(arn:aws:iam:::role/admin))) 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
role_description The description of the IAM role that is visible in the IAM role manager string 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
tags_enabled Enable/disable tags on IAM roles and policies string true 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
use_fullname If set to 'true' then the full ID for the IAM role name (e.g. [var.namespace]-[var.environment]-[var.stage]) will be used.

Otherwise, var.name will be used for the IAM role name.
bool true no

Outputs

Name Description
arn The Amazon Resource Name (ARN) specifying the role
id The stable and unique string identifying the role
instance_profile Name of the ec2 profile (if enabled)
name The name of the IAM role created
policy Role policy document in json format. Outputs always, independent of enabled variable

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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.


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