tfplan example data¶
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"tfplan": {
"format_version": "0.1",
"terraform_version": "0.13.4",
"variables": {
"aws_location": {
"value": "us-east-1"
},
"svr_count": {
"value": "1"
}
},
"planned_values": {
"outputs": {
"scalr_test_private_ip": {
"sensitive": false
},
"scalr_test_public_ip": {
"sensitive": false
}
},
"root_module": {
"resources": [
{
"address": "aws_instance.scalr_test[0]",
"mode": "managed",
"type": "aws_instance",
"name": "scalr_test",
"index": 0,
"provider_name": "registry.terraform.io/hashicorp/aws",
"schema_version": 1,
"values": {
"ami": "ami-024a64a6685d05041",
"credit_specification": [],
"disable_api_termination": null,
"ebs_optimized": null,
"get_password_data": false,
"hibernation": null,
"iam_instance_profile": null,
"instance_initiated_shutdown_behavior": null,
"instance_type": "t3.medium",
"key_name": "PeterG",
"monitoring": null,
"source_dest_check": true,
"subnet_id": "subnet-0ebb1058ad727cfdb",
"tags": null,
"timeouts": null,
"user_data": null,
"user_data_base64": null,
"vpc_security_group_ids": [
"sg-0880cfdc546b123ba"
]
}
},
{
"address": "aws_network_interface.test",
"mode": "managed",
"type": "aws_network_interface",
"name": "test",
"provider_name": "registry.terraform.io/hashicorp/aws",
"schema_version": 0,
"values": {
"description": null,
"private_ips": [
"10.0.0.50"
],
"source_dest_check": true,
"subnet_id": "subnet-0ebb1058ad727cfdb",
"tags": null
}
}
]
}
},
"resource_changes": [
{
"address": "aws_instance.scalr_test[0]",
"mode": "managed",
"type": "aws_instance",
"name": "scalr_test",
"index": 0,
"provider_name": "registry.terraform.io/hashicorp/aws",
"change": {
"actions": [
"create"
],
"before": null,
"after": {
"ami": "ami-024a64a6685d05041",
"credit_specification": [],
"disable_api_termination": null,
"ebs_optimized": null,
"get_password_data": false,
"hibernation": 1,
"iam_instance_profile": null,
"instance_initiated_shutdown_behavior": null,
"instance_type": "t3.medium",
"ipv6_addresses": 2,
"key_name": "d1",
"monitoring": null,
"source_dest_check": true,
"subnet_id": "subnet-0ebb1058ad727cfda",
"tags": null,
"timeouts": null,
"user_data": null,
"user_data_base64": null,
"vpc_security_group_ids":
[
"sg-0880cfdc546b123baa",
"sg-0880cfdc546b123baz",
"sg-0880cfdc546b123bag"
]
},
"after_unknown": {
"arn": true,
"associate_public_ip_address": true,
"availability_zone": true,
"cpu_core_count": true,
"cpu_threads_per_core": true,
"credit_specification": [],
"ebs_block_device": true,
"ephemeral_block_device": true,
"host_id": true,
"id": true,
"instance_state": true,
"ipv6_address_count": true,
"ipv6_addresses": true,
"metadata_options": true,
"network_interface": true,
"outpost_arn": true,
"password_data": true,
"placement_group": true,
"primary_network_interface_id": true,
"private_dns": true,
"private_ip": true,
"public_dns": true,
"public_ip": true,
"root_block_device": true,
"secondary_private_ips": true,
"security_groups": true,
"tenancy": true,
"volume_tags": true,
"vpc_security_group_ids": [
false
]
}
}
},
{
"address": "aws_network_interface.test",
"mode": "managed",
"type": "aws_network_interface",
"name": "test",
"provider_name": "registry.terraform.io/hashicorp/aws",
"change": {
"actions": [
"create"
],
"before": null,
"after": {
"description": null,
"private_ips": [
"10.0.0.50"
],
"source_dest_check": true,
"subnet_id": "subnet-0ebb1058ad727cfdb",
"tags": null
},
"after_unknown": {
"attachment": true,
"id": true,
"ipv6_address_count": true,
"ipv6_addresses": true,
"mac_address": true,
"outpost_arn": true,
"private_dns_name": true,
"private_ip": true,
"private_ips": [
false
],
"private_ips_count": true,
"security_groups": true
}
}
}
],
"output_changes": {
"scalr_test_private_ip": {
"actions": [
"create"
],
"before": null,
"after_unknown": true
},
"scalr_test_public_ip": {
"actions": [
"create"
],
"before": null,
"after_unknown": true
}
},
"configuration": {
"provider_config": {
"aws": {
"name": "aws",
"expressions": {
"region": {
"references": [
"var.aws_location"
]
}
}
}
},
"root_module": {
"outputs": {
"scalr_test_private_ip": {
"expression": {
"references": [
"aws_instance.scalr_test"
]
}
},
"scalr_test_public_ip": {
"expression": {
"references": [
"aws_instance.scalr_test"
]
}
}
},
"resources": [
{
"address": "aws_instance.scalr_test",
"mode": "managed",
"type": "aws_instance",
"name": "scalr_test",
"provider_config_key": "aws",
"expressions": {
"ami": {
"constant_value": "ami-024a64a6685d05041"
},
"instance_type": {
"constant_value": "t3.medium"
},
"key_name": {
"constant_value": "PeterG"
},
"subnet_id": {
"constant_value": "subnet-0ebb1058ad727cfdb"
},
"vpc_security_group_ids": {
"constant_value": [
"sg-0880cfdc546b123ba"
]
}
},
"schema_version": 1,
"count_expression": {
"references": [
"var.svr_count"
]
}
},
{
"address": "aws_network_interface.test",
"mode": "managed",
"type": "aws_network_interface",
"name": "test",
"provider_config_key": "aws",
"expressions": {
"private_ips": {
"constant_value": [
"10.0.0.50"
]
},
"subnet_id": {
"constant_value": "subnet-0ebb1058ad727cfdb"
}
},
"schema_version": 0
}
],
"variables": {
"aws_location": {},
"svr_count": {}
}
}
}
}
}
|
Example policy using tfrun¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | # Multi provider rule to enforce instance type/size
package terraform
import input.tfplan as tfplan
# Allowed sizes by provider (examples). Edit as required
allowed_types = {
"aws": ["t2.nano", "t2.micro"],
"azurerm": ["Standard_A0", "Standard_A1"],
"google": ["n1-standard-1", "n1-standard-2"]
}
# Attribute names for instance type/size by provider.
# Add additional elements for other resources and clouds
instance_type_key = {
"aws": [ "instance_type" ],
"azurerm": [ "size", "sku" ],
"google": [ "machine_type" ]
}
array_contains(arr, elem) {
arr[_] = elem
}
get_basename(path) = basename{
arr := split(path, "/")
basename:= arr[count(arr)-1]
}
# Extracts the instance type/size
get_instance_type(resource) = instance_type {
# registry.terraform.io/hashicorp/aws -> aws
instance_type := resource.change.after[instance_type_key[resource.type]]
}
deny[reason] {
resource := tfplan.resource_changes[_]
provider_name := get_basename(resource.provider_name)
# Extract array of type attribute names for the provider
provider_types := instance_type_key[provider_name]
# Iterate on each type name
type := provider_types[_]
# Extract the type value
instance_type := resource.change.after[type]
not array_contains(allowed_types[provider_name], instance_type)
reason := sprintf(
"%-60s :: '%s' of '%s' is not allowed",
[resource.address, type, instance_type]
)
}
|