├── LICENSE ├── README.md ├── bastion_host.tf ├── outputs.tf ├── security_group.tf ├── settings.tf └── variables.tf /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. Definitions. 8 | 9 | "License" shall mean the terms and conditions for use, reproduction, 10 | and distribution as defined by Sections 1 through 9 of this document. 11 | 12 | "Licensor" shall mean the copyright owner or entity authorized by 13 | the copyright owner that is granting the License. 14 | 15 | "Legal Entity" shall mean the union of the acting entity and all 16 | other entities that control, are controlled by, or are under common 17 | control with that entity. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## About 2 | 3 | Creates bastion host with allowed SSH access from specific IPs. 4 | 5 | Features: 6 | * Allow access from specific CIDRs (Default is `0.0.0.0/0`) 7 | 8 | ## Requirements 9 | Terraform >=0.12 required. You can use release [v0.3.1](https://github.com/jetbrains-infra/terraform-aws-bastion-host/releases/tag/v0.3.1) for older versions 10 | 11 | ## Usage 12 | 13 | Default 14 | ```hcl 15 | module "bastion" { 16 | source = "github.com/jetbrains-infra/terraform-aws-bastion-host" 17 | subnet_id = aws_subnet.public.id 18 | ssh_key = "ssh_key_name" 19 | internal_networks = ["10.0.10.0/24", module.vpc.subnet_internal1_cidr_block] 20 | project = "myProject" 21 | } 22 | ``` 23 | 24 | All params 25 | ```hcl 26 | module "bastion" { 27 | source = "github.com/jetbrains-infra/terraform-aws-bastion-host" 28 | subnet_id = aws_subnet.public.id 29 | ssh_key = "ssh_key_name" 30 | allowed_hosts = ["11.22.33.44/32", "99.88.77.66/24"] 31 | internal_networks = ["10.0.10.0/24", module.vpc.subnet_internal1_cidr_block] 32 | disk_size = 10 33 | instance_type = "t2.micro" 34 | project = "myProject" 35 | } 36 | ``` 37 | 38 | ## Params 39 | 40 | * `subnet_id` - The VPC Subnet ID to launch in. 41 | * `ssh_key` - The key name of the Key Pair to use for the instance. 42 | * `allowed_hosts` - CIDR blocks of trusted networks. 43 | * `internal_networks` - Internal network CIDR blocks. 44 | * `project` - The value for tag *project*. 45 | 46 | 47 | ### Optional params with default values 48 | 49 | * `disk_size` - The size of the root volume in gigabytes (Default `10`). 50 | * `instance_type` - The type of instance to start (Default `t2.micro`). 51 | 52 | ## Outputs 53 | 54 | * `public_ip` - bastion public IP 55 | * `private_ip` - bastion internal IP 56 | * `instance_id` - EC2 instance ID 57 | -------------------------------------------------------------------------------- /bastion_host.tf: -------------------------------------------------------------------------------- 1 | resource "aws_instance" "server" { 2 | ami = local.ami_id 3 | instance_type = local.instance_type 4 | key_name = local.ssh_key 5 | subnet_id = local.subnet_id 6 | vpc_security_group_ids = [aws_security_group.bastion.id] 7 | associate_public_ip_address = true 8 | 9 | root_block_device { 10 | volume_size = local.disk_size 11 | delete_on_termination = true 12 | } 13 | 14 | lifecycle { 15 | ignore_changes = [ami] 16 | } 17 | 18 | tags = { 19 | Name = "Bastion host" 20 | Project = local.project 21 | } 22 | } 23 | 24 | -------------------------------------------------------------------------------- /outputs.tf: -------------------------------------------------------------------------------- 1 | output "public_ip" { 2 | value = aws_instance.server.public_ip 3 | } 4 | 5 | output "private_ip" { 6 | value = aws_instance.server.private_ip 7 | } 8 | 9 | output "instance_id" { 10 | value = aws_instance.server.id 11 | } 12 | 13 | -------------------------------------------------------------------------------- /security_group.tf: -------------------------------------------------------------------------------- 1 | resource "aws_security_group" "bastion" { 2 | name = "Bastion host of ${local.project}" 3 | description = "Allow SSH access to bastion host and outbound internet access" 4 | vpc_id = local.vpc_id 5 | 6 | lifecycle { 7 | create_before_destroy = true 8 | } 9 | 10 | tags = { 11 | Project = local.project 12 | } 13 | } 14 | 15 | resource "aws_security_group_rule" "ssh" { 16 | protocol = "TCP" 17 | from_port = 22 18 | to_port = 22 19 | type = "ingress" 20 | cidr_blocks = var.allowed_hosts 21 | security_group_id = aws_security_group.bastion.id 22 | } 23 | 24 | resource "aws_security_group_rule" "internet" { 25 | protocol = "-1" 26 | from_port = 0 27 | to_port = 0 28 | type = "egress" 29 | cidr_blocks = ["0.0.0.0/0"] 30 | security_group_id = aws_security_group.bastion.id 31 | } 32 | 33 | resource "aws_security_group_rule" "intranet" { 34 | protocol = "-1" 35 | from_port = 0 36 | to_port = 0 37 | type = "egress" 38 | cidr_blocks = var.internal_networks 39 | security_group_id = aws_security_group.bastion.id 40 | } 41 | 42 | -------------------------------------------------------------------------------- /settings.tf: -------------------------------------------------------------------------------- 1 | 2 | terraform { 3 | required_version = ">= 0.12" 4 | } 5 | -------------------------------------------------------------------------------- /variables.tf: -------------------------------------------------------------------------------- 1 | variable "project" { 2 | description = "Project tag." 3 | } 4 | 5 | variable "subnet_id" { 6 | description = "The VPC Subnet ID to launch in." 7 | } 8 | 9 | variable "ssh_key" { 10 | description = "The key name of the Key Pair to use for the instance." 11 | } 12 | 13 | variable "allowed_hosts" { 14 | description = "CIDR blocks of trusted networks" 15 | type = list(string) 16 | default = ["0.0.0.0/0"] 17 | } 18 | 19 | variable "instance_type" { 20 | description = "The type of instance to start." 21 | default = "t3.micro" 22 | } 23 | 24 | variable "disk_size" { 25 | description = "The size of the root volume in gigabytes." 26 | default = 10 27 | } 28 | 29 | variable "internal_networks" { 30 | type = list(string) 31 | description = "Internal network CIDR blocks." 32 | } 33 | 34 | data "aws_ami" "centos" { 35 | most_recent = true 36 | 37 | filter { 38 | name = "product-code" 39 | values = ["aw0evgkw8e5c1q413zgy5pjce"] 40 | } 41 | 42 | owners = ["aws-marketplace"] 43 | } 44 | 45 | data "aws_subnet" "public" { 46 | id = local.subnet_id 47 | } 48 | 49 | locals { 50 | vpc_id = data.aws_subnet.public.vpc_id 51 | project = var.project 52 | ami_id = data.aws_ami.centos.id 53 | disk_size = var.disk_size 54 | subnet_id = var.subnet_id 55 | ssh_key = var.ssh_key 56 | instance_type = var.instance_type 57 | } 58 | 59 | --------------------------------------------------------------------------------