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terraform-aws-ec2-bastion-server Latest Release Slack Community

README Header

Cloud Posse

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.

This project is part of our comprehensive "SweetOps" approach towards DevOps.

Terraform Open Source Modules

It's 100% Open Source and licensed under the APACHE2.

We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!

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 Infrastructure Security Compliance
CIS KUBERNETES Center for Internet Security, KUBERNETES Compliance
CIS AWS Center for Internet Security, AWS Compliance
CIS AZURE Center for Internet Security, AZURE Compliance
PCI-DSS Payment Card Industry Data Security Standards Compliance
NIST-800-53 National Institute of Standards and Technology Compliance
ISO27001 Information Security Management System, ISO/IEC 27001 Compliance
SOC2 Service Organization Control 2 Compliance
CIS GCP Center for Internet Security, GCP Compliance
HIPAA 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

Providers

Name Version
aws >= 2.55

Modules

Name Source Version
dns cloudposse/route53-cluster-hostname/aws 0.12.2
security_group cloudposse/security-group/aws 0.3.3
this cloudposse/label/null 0.25.0

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

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
ami AMI to use for the instance. Setting this will ignore ami_filter and ami_owners. string null 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 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
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 ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role '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 keep the existing setting, which defaults to 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 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
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 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
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 ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' string null no
subnets AWS subnet IDs list(string) n/a yes
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
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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Please use the issue tracker to report any bugs or file feature requests.

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Copyright

Copyright © 2017-2022 Cloud Posse, LLC

License

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

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

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About

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Contributors

Erik Osterman
Erik Osterman		 Andriy Knysh
Andriy Knysh		 Igor Rodionov
Igor Rodionov		 Bobby Larson
Bobby Larson		 Vladimir Syromyatnikov
Vladimir Syromyatnikov		 Yonatan Koren
Yonatan Koren

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