Introducing Security Hub (#683)

Author: zdmytriv

modules/securityhub/common/README.md

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+#
+# ONLY EDIT THIS FILE IN github.com/cloudposse/terraform-null-label
+# All other instances of this file should be a copy of that one
+#
+#
+# Copy this file from https://github.com/cloudposse/terraform-null-label/blob/master/exports/context.tf
+# and then place it in your Terraform module to automatically get
+# Cloud Posse's standard configuration inputs suitable for passing
+# to Cloud Posse modules.
+#
+# curl -sL https://raw.githubusercontent.com/cloudposse/terraform-null-label/master/exports/context.tf -o context.tf
+#
+# Modules should access the whole context as `module.this.context`
+# to get the input variables with nulls for defaults,
+# for example `context = module.this.context`,
+# and access individual variables as `module.this.<var>`,
+# with final values filled in.
+#
+# For example, when using defaults, `module.this.context.delimiter`
+# will be null, and `module.this.delimiter` will be `-` (hyphen).
+#
+
+module "this" {
+  source  = "cloudposse/label/null"
+  version = "0.25.0" # requires Terraform >= 0.13.0
+
+  enabled             = var.enabled
+  namespace           = var.namespace
+  tenant              = var.tenant
+  environment         = var.environment
+  stage               = var.stage
+  name                = var.name
+  delimiter           = var.delimiter
+  attributes          = var.attributes
+  tags                = var.tags
+  additional_tag_map  = var.additional_tag_map
+  label_order         = var.label_order
+  regex_replace_chars = var.regex_replace_chars
+  id_length_limit     = var.id_length_limit
+  label_key_case      = var.label_key_case
+  label_value_case    = var.label_value_case
+  descriptor_formats  = var.descriptor_formats
+  labels_as_tags      = var.labels_as_tags
+
+  context = var.context
+}
+
+# Copy contents of cloudposse/terraform-null-label/variables.tf here
+
+variable "context" {
+  type = any
+  default = {
+    enabled             = true
+    namespace           = null
+    tenant              = null
+    environment         = null
+    stage               = null
+    name                = null
+    delimiter           = null
+    attributes          = []
+    tags                = {}
+    additional_tag_map  = {}
+    regex_replace_chars = null
+    label_order         = []
+    id_length_limit     = null
+    label_key_case      = null
+    label_value_case    = null
+    descriptor_formats  = {}
+    # Note: we have to use [] instead of null for unset lists due to
+    # https://github.com/hashicorp/terraform/issues/28137
+    # which was not fixed until Terraform 1.0.0,
+    # but we want the default to be all the labels in `label_order`
+    # and we want users to be able to prevent all tag generation
+    # by setting `labels_as_tags` to `[]`, so we need
+    # a different sentinel to indicate "default"
+    labels_as_tags = ["unset"]
+  }
+  description = <<-EOT
+    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.
+  EOT
+
+  validation {
+    condition     = lookup(var.context, "label_key_case", null) == null ? true : contains(["lower", "title", "upper"], var.context["label_key_case"])
+    error_message = "Allowed values: `lower`, `title`, `upper`."
+  }
+
+  validation {
+    condition     = lookup(var.context, "label_value_case", null) == null ? true : contains(["lower", "title", "upper", "none"], var.context["label_value_case"])
+    error_message = "Allowed values: `lower`, `title`, `upper`, `none`."
+  }
+}
+
+variable "enabled" {
+  type        = bool
+  default     = null
+  description = "Set to false to prevent the module from creating any resources"
+}
+
+variable "namespace" {
+  type        = string
+  default     = null
+  description = "ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique"
+}
+
+variable "tenant" {
+  type        = string
+  default     = null
+  description = "ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for"
+}
+
+variable "environment" {
+  type        = string
+  default     = null
+  description = "ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'"
+}
+
+variable "stage" {
+  type        = string
+  default     = null
+  description = "ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'"
+}
+
+variable "name" {
+  type        = string
+  default     = null
+  description = <<-EOT
+    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.
+    EOT
+}
+
+variable "delimiter" {
+  type        = string
+  default     = null
+  description = <<-EOT
+    Delimiter to be used between ID elements.
+    Defaults to `-` (hyphen). Set to `""` to use no delimiter at all.
+  EOT
+}
+
+variable "attributes" {
+  type        = list(string)
+  default     = []
+  description = <<-EOT
+    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.
+    EOT
+}
+
+variable "labels_as_tags" {
+  type        = set(string)
+  default     = ["default"]
+  description = <<-EOT
+    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.
+    EOT
+}
+
+variable "tags" {
+  type        = map(string)
+  default     = {}
+  description = <<-EOT
+    Additional tags (e.g. `{'BusinessUnit': 'XYZ'}`).
+    Neither the tag keys nor the tag values will be modified by this module.
+    EOT
+}
+
+variable "additional_tag_map" {
+  type        = map(string)
+  default     = {}
+  description = <<-EOT
+    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.
+    EOT
+}
+
+variable "label_order" {
+  type        = list(string)
+  default     = null
+  description = <<-EOT
+    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.
+    EOT
+}
+
+variable "regex_replace_chars" {
+  type        = string
+  default     = null
+  description = <<-EOT
+    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.
+  EOT
+}
+
+variable "id_length_limit" {
+  type        = number
+  default     = null
+  description = <<-EOT
+    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`.
+  EOT
+  validation {
+    condition     = var.id_length_limit == null ? true : var.id_length_limit >= 6 || var.id_length_limit == 0
+    error_message = "The id_length_limit must be >= 6 if supplied (not null), or 0 for unlimited length."
+  }
+}
+
+variable "label_key_case" {
+  type        = string
+  default     = null
+  description = <<-EOT
+    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`.
+  EOT
+
+  validation {
+    condition     = var.label_key_case == null ? true : contains(["lower", "title", "upper"], var.label_key_case)
+    error_message = "Allowed values: `lower`, `title`, `upper`."
+  }
+}
+
+variable "label_value_case" {
+  type        = string
+  default     = null
+  description = <<-EOT
+    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`.
+  EOT
+
+  validation {
+    condition     = var.label_value_case == null ? true : contains(["lower", "title", "upper", "none"], var.label_value_case)
+    error_message = "Allowed values: `lower`, `title`, `upper`, `none`."
+  }
+}
+
+variable "descriptor_formats" {
+  type        = any
+  default     = {}
+  description = <<-EOT
+    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
+    `{
+       format = string
+       labels = list(string)
+    }`
+    (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).
+    EOT
+}
+
+#### End of copy of cloudposse/terraform-null-label/variables.tf

modules/securityhub/common/context.tf

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+locals {
+  enabled                            = module.this.enabled
+  account_map                        = module.account_map.outputs.full_account_map
+  central_resource_collector_account = local.account_map[var.central_resource_collector_account]
+  account_id                         = one(data.aws_caller_identity.this[*].account_id)
+  region_name                        = one(data.aws_region.this[*].name)
+  is_global_collector_account        = local.central_resource_collector_account == local.account_id
+  is_collector_region                = local.region_name == var.central_resource_collector_region
+  member_account_list                = [for a in keys(local.account_map) : (local.account_map[a]) if local.account_map[a] != local.account_id]
+  enabled_standards_arns = toset([
+    for standard in var.enabled_standards :
+    format("arn:%s:securityhub:%s::%s", one(data.aws_partition.this[*].partition), length(regexall("ruleset", standard)) == 0 ? one(data.aws_region.this[*].name) : "", standard)
+  ])
+}
+
+data "aws_caller_identity" "this" {
+  count = local.enabled ? 1 : 0
+}
+
+data "aws_region" "this" {
+  count = local.enabled ? 1 : 0
+}
+
+data "aws_partition" "this" {
+  count = local.enabled ? 1 : 0
+}
+
+module "security_hub" {
+  count   = local.enabled && local.is_global_collector_account ? 1 : 0
+  source  = "cloudposse/security-hub/aws"
+  version = "0.10.0"
+
+  create_sns_topic                = var.create_sns_topic
+  enabled_standards               = var.enabled_standards
+  finding_aggregator_enabled      = local.is_collector_region && var.finding_aggregator_enabled
+  finding_aggregator_linking_mode = var.finding_aggregator_linking_mode
+  finding_aggregator_regions      = var.finding_aggregator_regions
+  enable_default_standards        = var.enable_default_standards
+
+  context = module.this.context
+}
+
+resource "aws_securityhub_account" "this" {
+  count = local.enabled && !local.is_global_collector_account ? 1 : 0
+
+  enable_default_standards = var.enable_default_standards
+}
+
+resource "aws_securityhub_standards_subscription" "this" {
+  for_each      = local.enabled && !local.is_global_collector_account ? local.enabled_standards_arns : []
+  depends_on    = [aws_securityhub_account.this]
+  standards_arn = each.key
+}
+
+resource "awsutils_security_hub_organization_settings" "this" {
+  count = local.enabled && local.is_global_collector_account && var.admin_delegated ? 1 : 0
+
+  member_accounts          = local.member_account_list
+  auto_enable_new_accounts = true
+}

modules/securityhub/common/main.tf

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+output "enabled_subscriptions" {
+  description = "A list of subscriptions that have been enabled"
+  value       = local.enabled && local.is_global_collector_account ? module.security_hub[0].enabled_subscriptions : []
+}
+
+output "sns_topic_name" {
+  description = "The SNS topic name that was created"
+  value       = local.enabled && local.is_global_collector_account && var.create_sns_topic ? module.security_hub[0].sns_topic.name : null
+}
+
+output "sns_topic_subscriptions" {
+  description = "The SNS topic subscriptions"
+  value       = local.enabled && local.is_global_collector_account && var.create_sns_topic ? module.security_hub[0].sns_topic_subscriptions : null
+}

modules/securityhub/common/outputs.tf

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+provider "aws" {
+  region = var.region
+
+  profile = module.iam_roles.profiles_enabled ? coalesce(var.import_profile_name, module.iam_roles.terraform_profile_name) : null
+  dynamic "assume_role" {
+    for_each = module.iam_roles.profiles_enabled ? [] : ["role"]
+    content {
+      role_arn = coalesce(var.import_role_arn, module.iam_roles.terraform_role_arn)
+    }
+  }
+}
+
+provider "awsutils" {
+  region = var.region
+
+  profile = module.iam_roles.profiles_enabled ? coalesce(var.import_profile_name, module.iam_roles.terraform_profile_name) : null
+  dynamic "assume_role" {
+    for_each = module.iam_roles.profiles_enabled ? [] : ["role"]
+    content {
+      role_arn = coalesce(var.import_role_arn, module.iam_roles.terraform_role_arn)
+    }
+  }
+}
+
+module "iam_roles" {
+  source = "../../account-map/modules/iam-roles"
+
+  context = module.this.context
+}
+
+variable "import_profile_name" {
+  type        = string
+  default     = null
+  description = "AWS Profile name to use when importing a resource"
+}
+
+variable "import_role_arn" {
+  type        = string
+  default     = null
+  description = "IAM Role ARN to use when importing a resource"
+}