Adds flag and policy to require all buckets requests to be over SSL (#67)

* Adds flag and policy to require all buckets requests to be over SSL

* Auto Format

* Update policy SID to match feature flag

Co-authored-by: cloudpossebot <[email protected]>

Author: bradj

README.md

@@ -181,12 +181,14 @@ Available targets:
 | [aws_iam_policy_document.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
 | [aws_iam_policy_document.deployment](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
 | [aws_iam_policy_document.replication](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
+| [aws_partition.current](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/partition) | data source |
 
 ## Inputs
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
 | <a name="input_additional_tag_map"></a> [additional\_tag\_map](#input\_additional\_tag\_map) | Additional tags for appending to tags\_as\_list\_of\_maps. Not added to `tags`. | `map(string)` | `{}` | no |
+| <a name="input_allow_ssl_requests_only"></a> [allow\_ssl\_requests\_only](#input\_allow\_ssl\_requests\_only) | Set to `true` to require requests to use Secure Socket Layer (HTTPS/SSL). This will explicitly deny access to HTTP requests | `bool` | `false` | no |
 | <a name="input_attributes"></a> [attributes](#input\_attributes) | Additional attributes (e.g. `1`) | `list(string)` | `[]` | no |
 | <a name="input_context"></a> [context](#input\_context) | Single object for setting entire context at once.<br>See description of individual variables for details.<br>Leave string and numeric variables as `null` to use default value.<br>Individual variable settings (non-null) override settings in context object,<br>except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | <pre>{<br>  "additional_tag_map": {},<br>  "attributes": [],<br>  "delimiter": null,<br>  "enabled": true,<br>  "environment": null,<br>  "id_length_limit": null,<br>  "label_key_case": null,<br>  "label_order": [],<br>  "label_value_case": null,<br>  "name": null,<br>  "namespace": null,<br>  "regex_replace_chars": null,<br>  "stage": null,<br>  "tags": {}<br>}</pre> | no |
 | <a name="input_cors_allowed_headers"></a> [cors\_allowed\_headers](#input\_cors\_allowed\_headers) | List of allowed headers | `list(string)` | <pre>[<br>  "*"<br>]</pre> | no |

docs/terraform.md

@@ -31,12 +31,14 @@
 | [aws_iam_policy_document.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
 | [aws_iam_policy_document.deployment](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
 | [aws_iam_policy_document.replication](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
+| [aws_partition.current](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/partition) | data source |
 
 ## Inputs
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
 | <a name="input_additional_tag_map"></a> [additional\_tag\_map](#input\_additional\_tag\_map) | Additional tags for appending to tags\_as\_list\_of\_maps. Not added to `tags`. | `map(string)` | `{}` | no |
+| <a name="input_allow_ssl_requests_only"></a> [allow\_ssl\_requests\_only](#input\_allow\_ssl\_requests\_only) | Set to `true` to require requests to use Secure Socket Layer (HTTPS/SSL). This will explicitly deny access to HTTP requests | `bool` | `false` | no |
 | <a name="input_attributes"></a> [attributes](#input\_attributes) | Additional attributes (e.g. `1`) | `list(string)` | `[]` | no |
 | <a name="input_context"></a> [context](#input\_context) | Single object for setting entire context at once.<br>See description of individual variables for details.<br>Leave string and numeric variables as `null` to use default value.<br>Individual variable settings (non-null) override settings in context object,<br>except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | <pre>{<br>  "additional_tag_map": {},<br>  "attributes": [],<br>  "delimiter": null,<br>  "enabled": true,<br>  "environment": null,<br>  "id_length_limit": null,<br>  "label_key_case": null,<br>  "label_order": [],<br>  "label_value_case": null,<br>  "name": null,<br>  "namespace": null,<br>  "regex_replace_chars": null,<br>  "stage": null,<br>  "tags": {}<br>}</pre> | no |
 | <a name="input_cors_allowed_headers"></a> [cors\_allowed\_headers](#input\_cors\_allowed\_headers) | List of allowed headers | `list(string)` | <pre>[<br>  "*"<br>]</pre> | no |

main.tf

@@ -1,5 +1,7 @@
 locals {
-  enabled = module.this.enabled
+  enabled    = module.this.enabled
+  bucket_arn = "arn:${data.aws_partition.current.partition}:s3:::${join("", aws_s3_bucket.default.*.id)}"
+
   website_config = {
     redirect_all = [
       {
@@ -129,6 +131,28 @@ data "aws_iam_policy_document" "default" {
     }
   }
 
+  dynamic "statement" {
+    for_each = var.allow_ssl_requests_only ? [1] : []
+
+    content {
+      sid       = "AllowSSLRequestsOnly"
+      effect    = "Deny"
+      actions   = ["s3:*"]
+      resources = [local.bucket_arn, "${local.bucket_arn}/*"]
+
+      principals {
+        identifiers = ["*"]
+        type        = "*"
+      }
+
+      condition {
+        test     = "Bool"
+        values   = ["false"]
+        variable = "aws:SecureTransport"
+      }
+    }
+  }
+
   # Support replication ARNs
   dynamic "statement" {
     for_each = flatten(data.aws_iam_policy_document.replication.*.statement)
@@ -253,6 +277,8 @@ data "aws_iam_policy_document" "deployment" {
   }
 }
 
+data "aws_partition" "current" {}
+
 module "dns" {
   source  = "cloudposse/route53-alias/aws"
   version = "0.12.0"

variables.tf

@@ -151,4 +151,10 @@ variable "encryption_enabled" {
   type        = bool
   default     = false
   description = "When set to 'true' the resource will have AES256 encryption enabled by default"
+}
+
+variable "allow_ssl_requests_only" {
+  type        = bool
+  default     = false
+  description = "Set to `true` to require requests to use Secure Socket Layer (HTTPS/SSL). This will explicitly deny access to HTTP requests"
 }