The terraform-aws-ec2-client-vpn project provides for ec2 client vpn infrastructure. AWS Client VPN is a managed client-based VPN service based on OpenVPN that enables you to securely access your AWS resources and resources in your on-premises network. With Client VPN, you can access your resources from any location using any OpenVPN-based VPN client.

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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 AWS), see test.

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

  cidr_block = "172.16.0.0/16"

  context = module.this.context
}

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

  cidr_block = "172.31.0.0/16"

  context = module.this.context
}

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

  availability_zones   = var.availability_zones
  vpc_id               = module.vpc_target.vpc_id
  igw_id               = module.vpc_target.igw_id
  cidr_block           = module.vpc_target.vpc_cidr_block
  nat_gateway_enabled  = true
  nat_instance_enabled = false

  context = module.this.context
}

module "ec2_client_vpn" {
  source  = "cloudposse/ec2-client-vpn/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  client_cidr             = module.vpc_client.vpc_cidr_block
  organization_name       = var.organization_name
  logging_enabled         = var.logging_enabled
  retention_in_days       = var.retention_in_days
  associated_subnets      = module.subnets.private_subnet_ids
  authorization_rules     = var.authorization_rules

  additional_routes = [
    {
      destination_cidr_block = "0.0.0.0/0"
      description            = "Internet Route"
      target_vpc_subnet_id   = element(module.subnets.private_subnet_ids, 0)
    }
  ]
}

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

Here is an example of using this module:

• examples/complete - complete example of using 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	>= 1.0
aws	>= 4.0
awsutils	>= 0.16.0

Providers

Name	Version
aws	>= 4.0
awsutils	>= 0.16.0

Modules

Name	Source	Version
cloudwatch_log	cloudposse/cloudwatch-logs/aws	0.6.8
self_signed_cert_ca	cloudposse/ssm-tls-self-signed-cert/aws	1.3.0
self_signed_cert_root	cloudposse/ssm-tls-self-signed-cert/aws	1.3.0
self_signed_cert_server	cloudposse/ssm-tls-self-signed-cert/aws	1.3.0
this	cloudposse/label/null	0.25.0
vpn_security_group	cloudposse/security-group/aws	2.2.0

Resources

Name	Type
aws_ec2_client_vpn_authorization_rule.default	resource
aws_ec2_client_vpn_endpoint.default	resource
aws_ec2_client_vpn_network_association.default	resource
aws_ec2_client_vpn_route.default	resource
aws_iam_saml_provider.default	resource
aws_ssm_parameter.ca_key	data source
aws_ssm_parameter.root_key	data source
awsutils_ec2_client_vpn_export_client_config.default	data source

Inputs

Name	Description	Type	Default	Required
additional_routes	A list of additional routes that should be attached to the Client VPN endpoint	list(object({ destination_cidr_block = string description = string target_vpc_subnet_id = string }))	[]	no
additional_security_group_rules	A list of Security Group rule objects to add to the created security group, in addition to the ones this module normally creates. (To suppress the module's rules, set create_security_group to false and supply your own security group via associated_security_group_ids.) The keys and values of the objects are fully compatible with the aws_security_group_rule resource, except for security_group_id which will be ignored, and the optional "key" which, if provided, must be unique and known at "plan" time. To get more info see https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/security_group_rule .	list(any)	[]	no
additional_security_groups	DEPRECATED: Use associated_security_group_ids instead. List of security groups to attach to the client vpn network associations	list(string)	[]	no
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
allow_self_security_group	Whether the security group itself will be added as a source to this ingress rule.	bool	true	no
allowed_cidr_blocks	A list of IPv4 CIDRs to allow access to the security group created by this module. The length of this list must be known at "plan" time.	list(string)	[]	no
allowed_ipv6_cidr_blocks	A list of IPv6 CIDRs to allow access to the security group created by this module. The length of this list must be known at "plan" time.	list(string)	[]	no
allowed_ipv6_prefix_list_ids	A list of IPv6 Prefix Lists IDs to allow access to the security group created by this module. The length of this list must be known at "plan" time.	list(string)	[]	no
allowed_security_group_ids	A list of IDs of Security Groups to allow access to the security group created by this module. The length of this list must be known at "plan" time.	list(string)	[]	no
associated_security_group_ids	A list of IDs of Security Groups to associate the VPN endpoints with, in addition to the created security group. These security groups will not be modified and, if create_security_group is false, must have rules providing the desired access.	list(string)	[]	no
associated_subnets	List of subnets to associate with the VPN endpoint	list(string)	n/a	yes
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
authentication_type	One of certificate-authentication or federated-authentication	string	"certificate-authentication"	no
authorization_rules	List of objects describing the authorization rules for the client vpn	list(map(any))	[]	no
ca_common_name	Unique Common Name for CA self-signed certificate	string	null	no
client_cidr	Network CIDR to use for clients	string	n/a	yes
client_conf_tmpl_path	Path to template file of vpn client exported configuration. Path is relative to ${path.module}	string	null	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
create_security_group	Set true to create and configure a new security group. If false, associated_security_group_ids must be provided.	bool	true	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
dns_servers	Information about the DNS servers to be used for DNS resolution. A Client VPN endpoint can have up to two DNS servers. If no DNS server is specified, the DNS address of the connecting device is used.	list(string)	[]	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
export_client_certificate	Flag to determine whether to export the client certificate with the VPN configuration	bool	false	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
logging_enabled	Enables or disables Client VPN Cloudwatch logging.	bool	false	no
logging_stream_name	Names of stream used for logging	string	n/a	yes
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
organization_name	Name of organization to use in private certificate	string	n/a	yes
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
retention_in_days	Number of days you want to retain log events in the log group	number	"30"	no
root_common_name	Unique Common Name for Root self-signed certificate	string	null	no
saml_metadata_document	Optional SAML metadata document. Must include this or saml_provider_arn	string	null	no
saml_provider_arn	Optional SAML provider ARN. Must include this or saml_metadata_document	string	null	no
secret_path_format	The path format to use when writing secrets to the certificate backend. The certificate secret path will be computed as format(var.secret_path_format, var.name, var.secret_extensions.certificate) and the private key path as format(var.secret_path_format, var.name, var.secret_extensions.private_key). Thus by default, if var.name=example-self-signed-cert, then the resulting secret paths for the self-signed certificate's PEM file and private key will be /example-self-signed-cert.pem and /example-self-signed-cert.key, respectively. This variable can be overridden in order to create more specific certificate backend paths.	string	"/%s.%s"	no
security_group_create_before_destroy	Set true to enable Terraform create_before_destroy behavior on the created security group. Note that changing this value will always cause the security group to be replaced.	bool	true	no
security_group_create_timeout	How long to wait for the security group to be created.	string	"10m"	no
security_group_delete_timeout	How long to retry on DependencyViolation errors during security group deletion from lingering ENIs left by certain AWS services such as Elastic Load Balancing.	string	"15m"	no
security_group_description	The description to assign to the created Security Group. Warning: Changing the description causes the security group to be replaced.	string	null	no
security_group_name	The name to assign to the created security group. Must be unique within the VPC. If not provided, will be derived from the null-label.context passed in. If create_before_destroy is true, will be used as a name prefix.	list(string)	[]	no
self_service_portal_enabled	Specify whether to enable the self-service portal for the Client VPN endpoint	bool	false	no
self_service_saml_provider_arn	The ARN of the IAM SAML identity provider for the self service portal if type is federated-authentication.	string	null	no
server_common_name	Unique Common Name for Server self-signed certificate	string	null	no
session_timeout_hours	The maximum session duration is a trigger by which end-users are required to re-authenticate prior to establishing a VPN session. Default value is 24. Valid values: 8 | 10 | 12 | 24	string	"24"	no
split_tunnel	Indicates whether split-tunnel is enabled on VPN endpoint. Default value is false.	bool	false	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
transport_protocol	Transport protocol used by the TLS sessions.	string	"udp"	no
vpc_id	ID of VPC to attach VPN to	string	n/a	yes

Outputs

Name	Description
client_configuration	VPN Client Configuration data.
full_client_configuration	Client configuration including client certificate and private key
vpn_endpoint_arn	The ARN of the Client VPN Endpoint Connection.
vpn_endpoint_dns_name	The DNS Name of the Client VPN Endpoint Connection.
vpn_endpoint_id	The ID of the Client VPN Endpoint Connection.

Related Projects

Check out these related projects.

• terraform-aws-components - Repository collection of aws components.
• terraform-aws-ssm-tls-self-signed-cert - This module creates a self-signed certificate and writes it alongside with its key to SSM Parameter Store (or alternatively AWS Secrets Manager). Used to store VPN certificates in ACM.
• terraform-provider-awsutils - Terraform provider for performing various tasks that cannot be performed with the official AWS Terraform Provider from Hashicorp. Used to export vpn client configuration.

References

For additional context, refer to some of these links.

• OpenVPN Clients - Any OpenVPN client should be compatible with the AWS Client VPN.

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Complete license is available in the LICENSE file.

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