folder

Google Cloud Folder Module

This module allows the creation and management of folders, including support for IAM bindings, organization policies, and hierarchical firewall rules.

Features

• IAM
• Organization Policies
  • Factory
• Hierarchical Firewall Policies
  • Directly Defined
  • Factory
• Log Sinks
• Tags

Basic example with IAM bindings

module "folder" {
  source = "./fabric/modules/folder"
  parent = "organizations/1234567890"
  name   = "Folder name"
  group_iam = {
    "[email protected]" = [
      "roles/owner",
      "roles/resourcemanager.folderAdmin",
      "roles/resourcemanager.projectCreator"
    ]
  }
  iam = {
    "roles/owner" = ["user:[email protected]"]
  }
  iam_additive = {
    "roles/compute.admin"  = ["user:[email protected]", "user:[email protected]"]
    "roles/compute.viewer" = ["user:[email protected]"]
  }
  iam_additive_members = {
    "user:[email protected]" = ["roles/storage.admin"]
    "user:[email protected]" = ["roles/storage.objectViewer"]
  }
}
# tftest modules=1 resources=9 inventory=iam.yaml

IAM

There are two mutually exclusive ways at the role level of managing IAM in this module

• non-authoritative via the iam_additive and iam_additive_members variables, where bindings created outside this module will coexist with those managed here
• authoritative via the group_iam and iam variables, where bindings created outside this module (eg in the console) will be removed at each terraform apply cycle if the same role is also managed here

Some care must be taken with the groups_iam variable (and in some situations with the additive variables) to ensure that variable keys are static values, so that Terraform is able to compute the dependency graph.

Organization policies

To manage organization policies, the orgpolicy.googleapis.com service should be enabled in the quota project.

module "folder" {
  source = "./fabric/modules/folder"
  parent = "organizations/1234567890"
  name   = "Folder name"
  org_policies = {
    "compute.disableGuestAttributesAccess" = {
      rules = [{ enforce = true }]
    }
    "compute.skipDefaultNetworkCreation" = {
      rules = [{ enforce = true }]
    }
    "iam.disableServiceAccountKeyCreation" = {
      rules = [{ enforce = true }]
    }
    "iam.disableServiceAccountKeyUpload" = {
      rules = [
        {
          condition = {
            expression  = "resource.matchTagId('tagKeys/1234', 'tagValues/1234')"
            title       = "condition"
            description = "test condition"
            location    = "somewhere"
          }
          enforce = true
        },
        {
          enforce = false
        }
      ]
    }
    "iam.allowedPolicyMemberDomains" = {
      rules = [{
        allow = {
          values = ["C0xxxxxxx", "C0yyyyyyy"]
        }
      }]
    }
    "compute.trustedImageProjects" = {
      rules = [{
        allow = {
          values = ["projects/my-project"]
        }
      }]
    }
    "compute.vmExternalIpAccess" = {
      rules = [{ deny = { all = true } }]
    }
  }
}
# tftest modules=1 resources=8 inventory=org-policies.yaml

Organization Policy Factory

See the organization policy factory in the project module.

Hierarchical Firewall Policies

Hierarchical firewall policies can be managed in two ways:

• via the firewall_policies variable, to directly define policies and rules in Terraform
• via the firewall_policy_factory variable, to leverage external YaML files via a simple "factory" embedded in the module (see here for more context on factories)

Once you have policies (either created via the module or externally), you can associate them using the firewall_policy_association variable.

Directly Defined Firewall Policies

module "folder1" {
  source = "./fabric/modules/folder"
  parent = var.organization_id
  name   = "policy-container"

  firewall_policies = {
    iap-policy = {
      allow-admins = {
        description             = "Access from the admin subnet to all subnets"
        direction               = "INGRESS"
        action                  = "allow"
        priority                = 1000
        ranges                  = ["10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"]
        ports                   = { all = [] }
        target_service_accounts = null
        target_resources        = null
        logging                 = false
      }
      allow-iap-ssh = {
        description             = "Always allow ssh from IAP"
        direction               = "INGRESS"
        action                  = "allow"
        priority                = 100
        ranges                  = ["35.235.240.0/20"]
        ports                   = { tcp = ["22"] }
        target_service_accounts = null
        target_resources        = null
        logging                 = false
      }
    }
  }
  firewall_policy_association = {
    iap-policy = "iap-policy"
  }
}

module "folder2" {
  source = "./fabric/modules/folder"
  parent = var.organization_id
  name   = "hf2"
  firewall_policy_association = {
    iap-policy = module.folder1.firewall_policy_id["iap-policy"]
  }
}
# tftest modules=2 resources=7 inventory=hfw.yaml

Firewall Policy Factory

The in-built factory allows you to define a single policy, using one file for rules, and an optional file for CIDR range substitution variables. Remember that non-absolute paths are relative to the root module (the folder where you run terraform).

module "folder1" {
  source = "./fabric/modules/folder"
  parent = var.organization_id
  name   = "policy-container"
  firewall_policy_factory = {
    cidr_file   = "configs/firewall-policies/cidrs.yaml"
    policy_name = "iap-policy"
    rules_file  = "configs/firewall-policies/rules.yaml"
  }
  firewall_policy_association = {
    iap-policy = "iap-policy"
  }
}

module "folder2" {
  source = "./fabric/modules/folder"
  parent = var.organization_id
  name   = "hf2"
  firewall_policy_association = {
    iap-policy = module.folder1.firewall_policy_id["iap-policy"]
  }
}
# tftest modules=2 resources=7 files=cidrs,rules inventory=hfw.yaml

# tftest-file id=cidrs path=configs/firewall-policies/cidrs.yaml
rfc1918:
  - 10.0.0.0/8
  - 172.16.0.0/12
  - 192.168.0.0/16

# tftest-file id=rules path=configs/firewall-policies/rules.yaml
allow-admins:
  description: Access from the admin subnet to all subnets
  direction: INGRESS
  action: allow
  priority: 1000
  ranges:
    - $rfc1918
  ports:
    all: []
  target_resources: null
  logging: false

allow-iap-ssh:
  description: "Always allow ssh from IAP"
  direction: INGRESS
  action: allow
  priority: 100
  ranges:
    - 35.235.240.0/20
  ports:
    tcp: ["22"]
  target_resources: null
  logging: false

Log Sinks

module "gcs" {
  source        = "./fabric/modules/gcs"
  project_id    = "my-project"
  name          = "gcs_sink"
  force_destroy = true
}

module "dataset" {
  source     = "./fabric/modules/bigquery-dataset"
  project_id = "my-project"
  id         = "bq_sink"
}

module "pubsub" {
  source     = "./fabric/modules/pubsub"
  project_id = "my-project"
  name       = "pubsub_sink"
}

module "bucket" {
  source      = "./fabric/modules/logging-bucket"
  parent_type = "project"
  parent      = "my-project"
  id          = "bucket"
}

module "folder-sink" {
  source = "./fabric/modules/folder"
  parent = "folders/657104291943"
  name   = "my-folder"
  logging_sinks = {
    warnings = {
      destination = module.gcs.id
      filter      = "severity=WARNING"
      type        = "storage"
    }
    info = {
      destination = module.dataset.id
      filter      = "severity=INFO"
      type        = "bigquery"
    }
    notice = {
      destination = module.pubsub.id
      filter      = "severity=NOTICE"
      type        = "pubsub"
    }
    debug = {
      destination = module.bucket.id
      filter      = "severity=DEBUG"
      exclusions = {
        no-compute = "logName:compute"
      }
      type = "logging"
    }
  }
  logging_exclusions = {
    no-gce-instances = "resource.type=gce_instance"
  }
}
# tftest modules=5 resources=14 inventory=logging.yaml

Tags

Refer to the Creating and managing tags documentation for details on usage.

module "org" {
  source          = "./fabric/modules/organization"
  organization_id = var.organization_id
  tags = {
    environment = {
      description = "Environment specification."
      iam         = null
      values = {
        dev  = null
        prod = null
      }
    }
  }
}

module "folder" {
  source = "./fabric/modules/folder"
  name   = "Test"
  parent = module.org.organization_id
  tag_bindings = {
    env-prod = module.org.tag_values["environment/prod"].id
    foo      = "tagValues/12345678"
  }
}
# tftest modules=2 resources=6 inventory=tags.yaml

Files

name	description	resources
firewall-policies.tf	None	google_compute_firewall_policy · google_compute_firewall_policy_association · google_compute_firewall_policy_rule
iam.tf	IAM bindings, roles and audit logging resources.	google_folder_iam_binding · google_folder_iam_member
logging.tf	Log sinks and supporting resources.	google_bigquery_dataset_iam_member · google_logging_folder_exclusion · google_logging_folder_sink · google_project_iam_member · google_pubsub_topic_iam_member · google_storage_bucket_iam_member
main.tf	Module-level locals and resources.	google_essential_contacts_contact · google_folder
organization-policies.tf	Folder-level organization policies.	google_org_policy_policy
outputs.tf	Module outputs.
tags.tf	None	google_tags_tag_binding
variables.tf	Module variables.
versions.tf	Version pins.

Variables

name	description	type	required	default
contacts	List of essential contacts for this resource. Must be in the form EMAIL -> [NOTIFICATION_TYPES]. Valid notification types are ALL, SUSPENSION, SECURITY, TECHNICAL, BILLING, LEGAL, PRODUCT_UPDATES.	map(list(string))		{}
firewall_policies	Hierarchical firewall policies created in this folder.	map(map(object({…})))		{}
firewall_policy_association	The hierarchical firewall policy to associate to this folder. Must be either a key in the firewall_policies map or the id of a policy defined somewhere else.	map(string)		{}
firewall_policy_factory	Configuration for the firewall policy factory.	object({…})		null
folder_create	Create folder. When set to false, uses id to reference an existing folder.	bool		true
group_iam	Authoritative IAM binding for organization groups, in {GROUP_EMAIL => [ROLES]} format. Group emails need to be static. Can be used in combination with the iam variable.	map(list(string))		{}
iam	IAM bindings in {ROLE => [MEMBERS]} format.	map(list(string))		{}
iam_additive	Non authoritative IAM bindings, in {ROLE => [MEMBERS]} format.	map(list(string))		{}
iam_additive_members	IAM additive bindings in {MEMBERS => [ROLE]} format. This might break if members are dynamic values.	map(list(string))		{}
id	Folder ID in case you use folder_create=false.	string		null
logging_exclusions	Logging exclusions for this folder in the form {NAME -> FILTER}.	map(string)		{}
logging_sinks	Logging sinks to create for the organization.	map(object({…}))		{}
name	Folder name.	string		null
org_policies	Organization policies applied to this folder keyed by policy name.	map(object({…}))		{}
org_policies_data_path	Path containing org policies in YAML format.	string		null
parent	Parent in folders/folder_id or organizations/org_id format.	string		null
tag_bindings	Tag bindings for this folder, in key => tag value id format.	map(string)		null

Outputs

name	description	sensitive
firewall_policies	Map of firewall policy resources created in this folder.
firewall_policy_id	Map of firewall policy ids created in this folder.
folder	Folder resource.
id	Fully qualified folder id.
name	Folder name.
sink_writer_identities	Writer identities created for each sink.