cloudposse/terraform-aws-ssm-tls-ssh-key-pair

Terraform module that provisions an SSH TLS Key pair and writes it to SSM Parameter Store

Terraform module that provisions an SSH TLS key pair and writes it to SSM Parameter Store.

This is useful for bot accounts (e.g. for GitHub). Easily rotate SSH secrets by simply tainting the module resource and reapplying.

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Usage

module "ssm_tls_ssh_key_pair" {
  source = "cloudposse/ssm-tls-ssh-key-pair/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace            = "eg"
  stage                = "prod"
  name                 = "app"
  ssm_path_prefix      = "ssh_keys"
  ssh_key_algorithm    = "ECDSA"
}

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.

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	>= 0.13.0
aws	>= 2.0
local	>= 1.3
null	>= 2.1
tls	>= 2.0

Providers

Name	Version
aws	>= 2.0
tls	>= 2.0

Modules

Name	Source	Version
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_ssm_parameter.private_ecdsa_key	resource
aws_ssm_parameter.private_rsa_key	resource
aws_ssm_parameter.public_ecdsa_key	resource
aws_ssm_parameter.public_rsa_key	resource
tls_private_key.default_ecdsa	resource
tls_private_key.default_rsa	resource
aws_kms_key.kms_key	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
ecdsa_curve	When ssh_key_algorithm is 'ECDSA', the name of the elliptic curve to use. May be any one of 'P256', 'P384' or P521'	string	"P256"	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
kms_key_id	KMS Key ID used for encryption	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
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
overwrite_ssm_parameter	Whether to overwrite an existing SSM parameter	bool	true	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
rsa_bits	When ssh_key_algorithm is 'RSA', the size of the generated RSA key in bits	number	4096	no
ssh_key_algorithm	SSH key algorithm to use. Currently-supported values are 'RSA' and 'ECDSA'	string	"RSA"	no
ssh_private_key_name	SSM Parameter name of the SSH private key	string	""	no
ssh_public_key_name	SSM Parameter name of the SSH public key	string	""	no
ssm_path_format	SSM path format	string	"/%s/%s"	no
ssm_path_prefix	The SSM parameter path prefix (e.g. /$ssm_path_prefix/$key_name)	string	"ssh_keys"	no
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
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
key_name	Name of SSH key
public_key	Content of the generated public key
ssh_private_key_ssm_path	SSM path of the generated private key
ssh_public_key_ssm_path	SSM path of the generated public key

Related Projects

Check out these related projects.

• terraform-aws-key-pair - Terraform Module to Automatically Generate SSH key Pairs (Public/Private Keys)
• terraform-tls-ssh-key-pair - Terraform module for generating an SSH public key file

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1. Review our Code of Conduct and Contributor Guidelines.
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6. Submit a Pull Request so that we can review your changes

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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
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Copyright © 2017-2024 Cloud Posse, LLC

terraform-aws-ssm-tls-ssh-key-pair'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

main.tf

outputs.tf

versions.tf

• aws >= 2.0
• local >= 1.3
• null >= 2.1
• tls >= 2.0
• hashicorp/terraform >= 0.13.0

---

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

Sensitive Data

Describe the Feature

Currently the output of the tls_private_key resources inside the module is not marked sensitive. Which results in private-keys being published in the Statefile.
I suggest marking all tls_private_key.*.private_key_pem as sensitive.

Expected Behavior

No PrivateKeys in the statefile.

Use Case

Always./Shared/Versioned Statefile

Write TLS Key pair to SSM

what

• Write TLS Key Pair to SSM

why

• So we don't need to use goofys and can share SSH keys (e.g. for GitHub bot accounts)

use-case

• kops & atlantis

Update README with Use Case

what

• Update readme to add some context around why someone might want to use this module

why

• this is useful for bot accounts
• Easily rotate SSH secrets by just tainting the module resource

example

chamber read -q atlantis atlantis_ssh_key > /dev/shm/id_rsa