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Network ACLs #238

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Network ACLs #238

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37ef55f
Add variables for network ACLs
kinghuang Sep 25, 2018
f973b98
Add variables for network ACL tags
kinghuang Sep 25, 2018
03e2363
Add resources for network ACLs
kinghuang Sep 25, 2018
feab0dc
Add resource for default network ACL
kinghuang Sep 25, 2018
757e573
Adjust spacing to match code style
kinghuang Sep 25, 2018
5bc3c85
Copy simple-vpc example as network-acls
kinghuang Sep 26, 2018
0a75f64
Rename variables from _acls to _acl_rules
kinghuang Oct 2, 2018
d469a8c
Add nacl resources and variables for other subnets
kinghuang Oct 2, 2018
e70cff3
Create ACLs only if there are subnets
kinghuang Oct 2, 2018
60e1a3a
Add missing variables for ACL tags
kinghuang Oct 2, 2018
3f8362f
Make ACL singular in description for _acl_tags
kinghuang Oct 2, 2018
51157a6
Convert rules to nested list of maps
kinghuang Feb 25, 2019
6b83388
Restructure example config to use locals
kinghuang Feb 25, 2019
caa7928
Follow-up for #174
antonbabenko Mar 22, 2019
acc1331
Merge branch 'master' into pr/174
antonbabenko Mar 22, 2019
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46 changes: 46 additions & 0 deletions README.md
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Expand Up @@ -11,6 +11,7 @@ These types of resources are supported:
* [Route](https://www.terraform.io/docs/providers/aws/r/route.html)
* [Route table](https://www.terraform.io/docs/providers/aws/r/route_table.html)
* [Internet Gateway](https://www.terraform.io/docs/providers/aws/r/internet_gateway.html)
* [Network ACL](https://www.terraform.io/docs/providers/aws/r/network_acl.html)
* [NAT Gateway](https://www.terraform.io/docs/providers/aws/r/nat_gateway.html)
* [VPN Gateway](https://www.terraform.io/docs/providers/aws/r/vpn_gateway.html)
* [VPC Endpoint](https://www.terraform.io/docs/providers/aws/r/vpc_endpoint.html):
Expand All @@ -21,6 +22,7 @@ These types of resources are supported:
* [Redshift Subnet Group](https://www.terraform.io/docs/providers/aws/r/redshift_subnet_group.html)
* [DHCP Options Set](https://www.terraform.io/docs/providers/aws/r/vpc_dhcp_options.html)
* [Default VPC](https://www.terraform.io/docs/providers/aws/r/default_vpc.html)
* [Default Network ACL](https://www.terraform.io/docs/providers/aws/r/default_network_acl.html)

Sponsored by [Cloudcraft - the best way to draw AWS diagrams](https://cloudcraft.co/?utm_source=terraform-aws-vpc)

Expand Down Expand Up @@ -165,6 +167,14 @@ Sometimes it is handy to have public access to RDS instances (it is not recommen
enable_dns_support = true
```

## Network Access Control Lists (ACL or NACL)

This module can manage network ACL and rules. Once VPC is created, AWS creates the default network ACL, which can be controlled using this module (`manage_default_network_acl = true`).

Also, each type of subnet may have its own network ACL with custom rules per subnet. Eg, set `public_dedicated_network_acl = true` to use dedicated network ACL for the public subnets; set values of `public_inbound_acl_rules` and `public_outbound_acl_rules` to specify all the NACL rules you need to have on public subnets (see `variables.tf` for default values and structures).

By default, all subnets are associated with the default network ACL.

## Public access to Redshift cluster

Sometimes it is handy to have public access to Redshift clusters (for example if you need to access it by Kinesis - VPC endpoint for Kinesis is not yet supported by Redshift) by specifying these arguments:
Expand All @@ -182,6 +192,7 @@ Terraform version 0.10.3 or newer is required for this module to work.
* [Simple VPC](https://github.com/terraform-aws-modules/terraform-aws-vpc/tree/master/examples/simple-vpc)
* [Complete VPC](https://github.com/terraform-aws-modules/terraform-aws-vpc/tree/master/examples/complete-vpc)
* [Manage Default VPC](https://github.com/terraform-aws-modules/terraform-aws-vpc/tree/master/examples/manage-default-vpc)
* [Network ACL](https://github.com/terraform-aws-modules/terraform-aws-vpc/tree/master/examples/network-acls)
* Few tests and edge cases examples: [#46](https://github.com/terraform-aws-modules/terraform-aws-vpc/tree/master/examples/issue-46-no-private-subnets), [#44](https://github.com/terraform-aws-modules/terraform-aws-vpc/tree/master/examples/issue-44-asymmetric-private-subnets), [#108](https://github.com/terraform-aws-modules/terraform-aws-vpc/tree/master/examples/issue-108-route-already-exists)

<!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
Expand All @@ -205,11 +216,19 @@ Terraform version 0.10.3 or newer is required for this module to work.
| create\_redshift\_subnet\_group | Controls if redshift subnet group should be created | string | `"true"` | no |
| create\_redshift\_subnet\_route\_table | Controls if separate route table for redshift should be created | string | `"false"` | no |
| create\_vpc | Controls if VPC should be created (it affects almost all resources) | string | `"true"` | no |
| database\_acl\_tags | Additional tags for the database subnets network ACL | map | `{}` | no |
| database\_dedicated\_network\_acl | Whether to use dedicated network ACL (not default) and custom rules for database subnets | string | `"false"` | no |
| database\_inbound\_acl\_rules | Database subnets inbound network ACL rules | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| database\_outbound\_acl\_rules | Database subnets outbound network ACL rules | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| database\_route\_table\_tags | Additional tags for the database route tables | map | `{}` | no |
| database\_subnet\_group\_tags | Additional tags for the database subnet group | map | `{}` | no |
| database\_subnet\_suffix | Suffix to append to database subnets name | string | `"db"` | no |
| database\_subnet\_tags | Additional tags for the database subnets | map | `{}` | no |
| database\_subnets | A list of database subnets | list | `[]` | no |
| default\_network\_acl\_egress | List of maps of egress rules to set on the Default Network ACL | list | `[ { "action": "allow", "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_no": 100, "to_port": 0 }, { "action": "allow", "from_port": 0, "ipv6_cidr_block": "::/0", "protocol": "-1", "rule_no": 101, "to_port": 0 } ]` | no |
| default\_network\_acl\_ingress | List of maps of ingress rules to set on the Default Network ACL | list | `[ { "action": "allow", "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_no": 100, "to_port": 0 }, { "action": "allow", "from_port": 0, "ipv6_cidr_block": "::/0", "protocol": "-1", "rule_no": 101, "to_port": 0 } ]` | no |
| default\_network\_acl\_name | Name to be used on the Default Network ACL | string | `""` | no |
| default\_network\_acl\_tags | Additional tags for the Default Network ACL | map | `{}` | no |
| default\_vpc\_enable\_classiclink | Should be true to enable ClassicLink in the Default VPC | string | `"false"` | no |
| default\_vpc\_enable\_dns\_hostnames | Should be true to enable DNS hostnames in the Default VPC | string | `"false"` | no |
| default\_vpc\_enable\_dns\_support | Should be true to enable DNS support in the Default VPC | string | `"true"` | no |
Expand All @@ -233,6 +252,10 @@ Terraform version 0.10.3 or newer is required for this module to work.
| ecr\_dkr\_endpoint\_private\_dns\_enabled | Whether or not to associate a private hosted zone with the specified VPC for ECR DKR endpoint | string | `"false"` | no |
| ecr\_dkr\_endpoint\_security\_group\_ids | The ID of one or more security groups to associate with the network interface for ECR DKR endpoint | list | `[]` | no |
| ecr\_dkr\_endpoint\_subnet\_ids | The ID of one or more subnets in which to create a network interface for ECR dkr endpoint. If omitted, private subnets will be used. | list | `[]` | no |
| elasticache\_acl\_tags | Additional tags for the elasticache subnets network ACL | map | `{}` | no |
| elasticache\_dedicated\_network\_acl | Whether to use dedicated network ACL (not default) and custom rules for elasticache subnets | string | `"false"` | no |
| elasticache\_inbound\_acl\_rules | Elasticache subnets inbound network ACL rules | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| elasticache\_outbound\_acl\_rules | Elasticache subnets outbound network ACL rules | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| elasticache\_route\_table\_tags | Additional tags for the elasticache route tables | map | `{}` | no |
| elasticache\_subnet\_suffix | Suffix to append to elasticache subnets name | string | `"elasticache"` | no |
| elasticache\_subnet\_tags | Additional tags for the elasticache subnets | map | `{}` | no |
Expand All @@ -255,26 +278,43 @@ Terraform version 0.10.3 or newer is required for this module to work.
| external\_nat\_ip\_ids | List of EIP IDs to be assigned to the NAT Gateways (used in combination with reuse_nat_ips) | list | `[]` | no |
| igw\_tags | Additional tags for the internet gateway | map | `{}` | no |
| instance\_tenancy | A tenancy option for instances launched into the VPC | string | `"default"` | no |
| intra\_acl\_tags | Additional tags for the intra subnets network ACL | map | `{}` | no |
| intra\_dedicated\_network\_acl | Whether to use dedicated network ACL (not default) and custom rules for intra subnets | string | `"false"` | no |
| intra\_inbound\_acl\_rules | Intra subnets inbound network ACLs | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| intra\_outbound\_acl\_rules | Intra subnets outbound network ACLs | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| intra\_route\_table\_tags | Additional tags for the intra route tables | map | `{}` | no |
| intra\_subnet\_suffix | Suffix to append to intra subnets name | string | `"intra"` | no |
| intra\_subnet\_tags | Additional tags for the intra subnets | map | `{}` | no |
| intra\_subnets | A list of intra subnets | list | `[]` | no |
| manage\_default\_network\_acl | Should be true to adopt and manage Default Network ACL | string | `"false"` | no |
| manage\_default\_vpc | Should be true to adopt and manage Default VPC | string | `"false"` | no |
| map\_public\_ip\_on\_launch | Should be false if you do not want to auto-assign public IP on launch | string | `"true"` | no |
| name | Name to be used on all the resources as identifier | string | `""` | no |
| nat\_eip\_tags | Additional tags for the NAT EIP | map | `{}` | no |
| nat\_gateway\_tags | Additional tags for the NAT gateways | map | `{}` | no |
| one\_nat\_gateway\_per\_az | Should be true if you want only one NAT Gateway per availability zone. Requires `var.azs` to be set, and the number of `public_subnets` created to be greater than or equal to the number of availability zones specified in `var.azs`. | string | `"false"` | no |
| private\_acl\_tags | Additional tags for the private subnets network ACL | map | `{}` | no |
| private\_dedicated\_network\_acl | Whether to use dedicated network ACL (not default) and custom rules for private subnets | string | `"false"` | no |
| private\_inbound\_acl\_rules | Private subnets inbound network ACLs | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| private\_outbound\_acl\_rules | Private subnets outbound network ACLs | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| private\_route\_table\_tags | Additional tags for the private route tables | map | `{}` | no |
| private\_subnet\_suffix | Suffix to append to private subnets name | string | `"private"` | no |
| private\_subnet\_tags | Additional tags for the private subnets | map | `{}` | no |
| private\_subnets | A list of private subnets inside the VPC | list | `[]` | no |
| propagate\_private\_route\_tables\_vgw | Should be true if you want route table propagation | string | `"false"` | no |
| propagate\_public\_route\_tables\_vgw | Should be true if you want route table propagation | string | `"false"` | no |
| public\_acl\_tags | Additional tags for the public subnets network ACL | map | `{}` | no |
| public\_dedicated\_network\_acl | Whether to use dedicated network ACL (not default) and custom rules for public subnets | string | `"false"` | no |
| public\_inbound\_acl\_rules | Public subnets inbound network ACLs | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| public\_outbound\_acl\_rules | Public subnets outbound network ACLs | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| public\_route\_table\_tags | Additional tags for the public route tables | map | `{}` | no |
| public\_subnet\_suffix | Suffix to append to public subnets name | string | `"public"` | no |
| public\_subnet\_tags | Additional tags for the public subnets | map | `{}` | no |
| public\_subnets | A list of public subnets inside the VPC | list | `[]` | no |
| redshift\_acl\_tags | Additional tags for the redshift subnets network ACL | map | `{}` | no |
| redshift\_dedicated\_network\_acl | Whether to use dedicated network ACL (not default) and custom rules for redshift subnets | string | `"false"` | no |
| redshift\_inbound\_acl\_rules | Redshift subnets inbound network ACL rules | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| redshift\_outbound\_acl\_rules | Redshift subnets outbound network ACL rules | list | `[ { "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_action": "allow", "rule_number": 100, "to_port": 0 } ]` | no |
| redshift\_route\_table\_tags | Additional tags for the redshift route tables | map | `{}` | no |
| redshift\_subnet\_group\_tags | Additional tags for the redshift subnet group | map | `{}` | no |
| redshift\_subnet\_suffix | Suffix to append to redshift subnets name | string | `"redshift"` | no |
Expand All @@ -299,6 +339,7 @@ Terraform version 0.10.3 or newer is required for this module to work.
| Name | Description |
|------|-------------|
| azs | A list of availability zones specified as argument to this module |
| database\_network\_acl\_id | ID of the database network ACL |
| database\_route\_table\_ids | List of IDs of database route tables |
| database\_subnet\_group | ID of database subnet group |
| database\_subnets | List of IDs of database subnets |
Expand All @@ -315,24 +356,29 @@ Terraform version 0.10.3 or newer is required for this module to work.
| default\_vpc\_id | The ID of the VPC |
| default\_vpc\_instance\_tenancy | Tenancy of instances spin up within VPC |
| default\_vpc\_main\_route\_table\_id | The ID of the main route table associated with this VPC |
| elasticache\_network\_acl\_id | ID of the elasticache network ACL |
| elasticache\_route\_table\_ids | List of IDs of elasticache route tables |
| elasticache\_subnet\_group | ID of elasticache subnet group |
| elasticache\_subnet\_group\_name | Name of elasticache subnet group |
| elasticache\_subnets | List of IDs of elasticache subnets |
| elasticache\_subnets\_cidr\_blocks | List of cidr_blocks of elasticache subnets |
| igw\_id | The ID of the Internet Gateway |
| intra\_network\_acl\_id | ID of the intra network ACL |
| intra\_route\_table\_ids | List of IDs of intra route tables |
| intra\_subnets | List of IDs of intra subnets |
| intra\_subnets\_cidr\_blocks | List of cidr_blocks of intra subnets |
| nat\_ids | List of allocation ID of Elastic IPs created for AWS NAT Gateway |
| nat\_public\_ips | List of public Elastic IPs created for AWS NAT Gateway |
| natgw\_ids | List of NAT Gateway IDs |
| private\_network\_acl\_id | ID of the private network ACL |
| private\_route\_table\_ids | List of IDs of private route tables |
| private\_subnets | List of IDs of private subnets |
| private\_subnets\_cidr\_blocks | List of cidr_blocks of private subnets |
| public\_network\_acl\_id | ID of the public network ACL |
| public\_route\_table\_ids | List of IDs of public route tables |
| public\_subnets | List of IDs of public subnets |
| public\_subnets\_cidr\_blocks | List of cidr_blocks of public subnets |
| redshift\_network\_acl\_id | ID of the redshift network ACL |
| redshift\_route\_table\_ids | List of IDs of redshift route tables |
| redshift\_subnet\_group | ID of redshift subnet group |
| redshift\_subnets | List of IDs of redshift subnets |
Expand Down
39 changes: 39 additions & 0 deletions examples/network-acls/README.md
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@@ -0,0 +1,39 @@
# Simple VPC with Network ACLs

Configuration in this directory creates set of VPC resources along with network ACLs for public subnets.

There is a public and private subnet created per availability zone in addition to single NAT Gateway shared between all 3 availability zones.

Network ACL rules for inbound and outbound traffic are defined as the following:
1. Public subnets will have network ACL rules provided
1. Private subnets will be associated with the default network ACL rules (IPV4-only ingress and egress is open for all)
1. Elasticache subnets will use the default network ACL (created and managed by AWS)

## Usage

To run this example you need to execute:

```bash
$ terraform init
$ terraform plan
$ terraform apply
```

Note that this example may create resources which can cost money (AWS Elastic IP, for example). Run `terraform destroy` when you don't need these resources.

<!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
## Outputs

| Name | Description |
|------|-------------|
| default\_network\_acl\_id | The ID of the default network ACL |
| elasticache\_network\_acl\_id | ID of the elasticache network ACL |
| nat\_public\_ips | List of public Elastic IPs created for AWS NAT Gateway |
| private\_network\_acl\_id | ID of the private network ACL |
| private\_subnets | List of IDs of private subnets |
| public\_network\_acl\_id | ID of the public network ACL |
| public\_subnets | List of IDs of public subnets |
| vpc\_cidr\_block | The CIDR block of the VPC |
| vpc\_id | The ID of the VPC |

<!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
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