terraform-aws-ec2-bastion-server

Terraform module to define a generic Bastion host with parameterized user_data and support for AWS SSM Session Manager for remote access with IAM authentication.

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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 Compliance
	Center for Internet Security, KUBERNETES Compliance
	Center for Internet Security, AWS Compliance
	Center for Internet Security, AZURE Compliance
	Payment Card Industry Data Security Standards Compliance
	National Institute of Standards and Technology Compliance
	Information Security Management System, ISO/IEC 27001 Compliance
	Service Organization Control 2 Compliance
	Center for Internet Security, GCP Compliance
	Health Insurance Portability and Accountability Compliance

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	>= 2.55
template	>= 2.1

Providers

Name	Version
aws	>= 2.55
template	>= 2.1

Modules

Name	Source	Version
dns	cloudposse/route53-cluster-hostname/aws	0.12.0
security_group	cloudposse/security-group/aws	0.3.1
this	cloudposse/label/null	0.24.1

Resources

Name	Type
aws_eip.default	resource
aws_iam_instance_profile.default	resource
aws_iam_role.default	resource
aws_iam_role_policy.main	resource
aws_instance.default	resource
aws_ami.default	data source
aws_iam_policy_document.default	data source
aws_iam_policy_document.main	data source
aws_region.default	data source
aws_route53_zone.domain	data source
template_file.user_data	data source

Inputs

Name	Description	Type	Default	Required
additional_tag_map	Additional tags for appending to tags_as_list_of_maps. Not added to `tags`.	`map(string)`	`{}`	no
ami_filter	List of maps used to create the AMI filter for the action runner AMI.	`map(list(string))`	{ "name": [ "amzn2-ami-hvm-2.*-x86_64-ebs" ] }	no
ami_owners	The list of owners used to select the AMI of action runner instances.	`list(string)`	[ "amazon" ]	no
assign_eip_address	Assign an Elastic IP address to the instance	`bool`	`true`	no
associate_public_ip_address	Whether to associate a public IP to the instance.	`bool`	`false`	no
attributes	Additional attributes (e.g. `1`)	`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, "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
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
disable_api_termination	Enable EC2 Instance Termination Protection	`bool`	`false`	no
ebs_block_device_encrypted	Whether to encrypt the EBS block device	`bool`	`true`	no
ebs_block_device_volume_size	The volume size (in GiB) to provision for the EBS block device. Creation skipped if size is 0	`number`	`0`	no
ebs_delete_on_termination	Whether the EBS volume should be destroyed on instance termination	`bool`	`true`	no
ebs_device_name	The name of the EBS block device to mount on the instance	`string`	`"/dev/sdh"`	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
host_name	The Bastion hostname created in Route53	`string`	`"bastion"`	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
instance_profile	A pre-defined profile to attach to the instance (default is to build our own)	`string`	`""`	no
instance_type	Bastion instance type	`string`	`"t2.micro"`	no
key_name	Key name	`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
metadata_http_endpoint_enabled	Whether the metadata service is available	`bool`	`true`	no
metadata_http_put_response_hop_limit	The desired HTTP PUT response hop limit (between 1 and 64) for instance metadata requests.	`number`	`1`	no
metadata_http_tokens_required	Whether or not the metadata service requires session tokens, also referred to as Instance Metadata Service Version 2.	`bool`	`true`	no
monitoring	Launched EC2 instance will have detailed monitoring enabled	`bool`	`true`	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
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
root_block_device_encrypted	Whether to encrypt the root block device	`bool`	`true`	no
root_block_device_volume_size	The volume size (in GiB) to provision for the root block device. It cannot be smaller than the AMI it refers to.	`number`	`8`	no
security_group_description	The Security Group description.	`string`	`"Bastion host security group"`	no
security_group_enabled	Whether to create default Security Group for bastion host.	`bool`	`true`	no
security_group_rules	A list of maps of Security Group rules. The values of map is fully complated with `aws_security_group_rule` resource. To get more info see https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/security_group_rule .	`list(any)`	[ { "cidr_blocks": [ "0.0.0.0/0" ], "description": "Allow all outbound traffic", "from_port": 0, "protocol": -1, "to_port": 0, "type": "egress" }, { "cidr_blocks": [ "0.0.0.0/0" ], "description": "Allow all inbound to SSH", "from_port": 22, "protocol": "tcp", "to_port": 22, "type": "ingress" } ]	no
security_group_use_name_prefix	Whether to create a default Security Group with unique name beginning with the normalized prefix.	`bool`	`false`	no
security_groups	A list of Security Group IDs to associate with bastion host.	`list(string)`	`[]`	no
ssh_user	Default SSH user for this AMI. e.g. `ec2-user` for Amazon Linux and `ubuntu` for Ubuntu systems	`string`	`"ec2-user"`	no
ssm_enabled	Enable SSM Agent on Host.	`bool`	`true`	no
stage	Stage, e.g. 'prod', 'staging', 'dev', OR 'source', 'build', 'test', 'deploy', 'release'	`string`	`null`	no
subnets	AWS subnet IDs	`list(string)`	n/a	yes
tags	Additional tags (e.g. `map('BusinessUnit','XYZ')`	`map(string)`	`{}`	no
user_data	User data content. Will be ignored if `user_data_base64` is set	`list(string)`	`[]`	no
user_data_base64	The Base64-encoded user data to provide when launching the instances. If this is set then `user_data` will not be used.	`string`	`""`	no
user_data_template	User Data template to use for provisioning EC2 Bastion Host	`string`	`"user_data/amazon-linux.sh"`	no
vpc_id	VPC ID	`string`	n/a	yes
zone_id	Route53 DNS Zone ID	`string`	`""`	no

Outputs

Name	Description
arn	ARN of the instance
hostname	DNS hostname
id	Disambiguated ID of the instance
instance_id	Instance ID
name	Instance name
private_dns	Private DNS of instance
private_ip	Private IP of the instance
public_dns	Public DNS of instance (or DNS of EIP)
public_ip	Public IP of the instance (or EIP)
role	Name of AWS IAM Role associated with the instance
security_group_arn	Bastion host Security Group ARN
security_group_id	Bastion host Security Group ID
security_group_ids	IDs on the AWS Security Groups associated with the instance
security_group_name	Bastion host Security Group name
ssh_user	SSH user

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Related Projects

Check out these related projects.

bastion - 🔒Secure Bastion implemented as Docker Container running Alpine Linux with Google Authenticator & DUO MFA support
terraform-aws-ec2-instance - Terraform module for providing a general EC2 instance provisioned by Ansible
terraform-aws-ec2-ami-backup - Terraform module for automatic & scheduled AMI creation

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Copyright

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

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