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main.tf
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################################################################################
# General
################################################################################
#region
data "aws_region" "current" {}
data "aws_caller_identity" "current" {}
data "aws_partition" "current" {}
data "aws_iam_session_context" "current" {
# This data source provides information on the IAM source role of an STS assumed role
# For non-role ARNs, this data source simply passes the ARN through issuer ARN
# Ref https://github.com/terraform-aws-modules/terraform-aws-eks/issues/2327#issuecomment-1355581682
# Ref https://github.com/hashicorp/terraform-provider-aws/issues/28381
arn = data.aws_caller_identity.current.arn
}
#endregion
################################################################################
# S3 Bucket
################################################################################
#region
locals {
s3_bucket_name = try(coalesce(var.s3_bucket_name, "${var.name}-cloudtrail"), null)
s3_bucket_name_prefix = try(coalesce(var.s3_bucket_name_prefix, "${var.name}-cloudtrail-"), null)
bucket_policy = try(coalesce(var.bucket_policy, data.aws_iam_policy_document.s3_bucket[0].json), null)
# local.kms_master_key_id sets KMS encryption: uses custom config if provided, else defaults to module's key or specified kms_key_id, and is null if encryption is disabled.
kms_master_key_id = var.create_kms_key ? module.kms.key_id : var.kms_key_id
default_encryption_configuration = {
rule = {
apply_server_side_encryption_by_default = {
sse_algorithm = "aws:kms"
kms_master_key_id = local.kms_master_key_id
}
}
}
s3_bucket_server_side_encryption_configuration = var.enable_s3_bucket_server_side_encryption_configuration ? coalesce(var.s3_bucket_server_side_encryption_configuration, local.default_encryption_configuration) : null
}
data "aws_iam_policy_document" "s3_bucket" {
count = var.create_s3_bucket ? 1 : 0
statement {
sid = "AWSCloudTrailAclCheck"
effect = "Allow"
principals {
type = "Service"
identifiers = ["cloudtrail.amazonaws.com"]
}
actions = ["s3:GetBucketAcl"]
resources = [module.s3_bucket.s3_bucket_arn]
condition {
test = "StringEquals"
variable = "aws:SourceArn"
values = ["arn:${data.aws_partition.current.partition}:cloudtrail:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:trail/${var.name}"]
}
}
statement {
sid = "AWSCloudTrailWrite"
effect = "Allow"
principals {
type = "Service"
identifiers = ["cloudtrail.amazonaws.com"]
}
actions = ["s3:PutObject"]
resources = ["${module.s3_bucket.s3_bucket_arn}/${var.s3_key_prefix}/AWSLogs/${data.aws_caller_identity.current.account_id}/*"]
condition {
test = "StringEquals"
variable = "s3:x-amz-acl"
values = ["bucket-owner-full-control"]
}
condition {
test = "StringEquals"
variable = "aws:SourceArn"
values = ["arn:${data.aws_partition.current.partition}:cloudtrail:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:trail/${var.name}"]
}
}
}
module "s3_bucket" {
source = "git::https://github.com/terraform-aws-modules/terraform-aws-s3-bucket.git?ref=v4.1.2"
create_bucket = var.create_s3_bucket
bucket = var.s3_bucket_name_use_prefix ? null : local.s3_bucket_name
bucket_prefix = var.s3_bucket_name_use_prefix ? local.s3_bucket_name_prefix : null
attach_policy = var.attach_bucket_policy
policy = local.bucket_policy
attach_public_policy = var.attach_public_bucket_policy
block_public_acls = var.block_public_acls
block_public_policy = var.block_public_policy
ignore_public_acls = var.ignore_public_acls
restrict_public_buckets = var.restrict_public_buckets
versioning = var.s3_bucket_versioning
server_side_encryption_configuration = local.s3_bucket_server_side_encryption_configuration
lifecycle_rule = var.s3_bucket_lifecycle_rules
force_destroy = var.s3_bucket_force_destroy
tags = var.tags
}
#endregion
################################################################################
# IAM
################################################################################
#region
# This section is used for allowing CloudTrail to send logs to CloudWatch.
locals {
cloudtrail_iam_role_name = try(coalesce(var.cloudtrail_iam_role_name, "${var.name}-cloudtrail-to-cloudwatch"), null)
cloudtrail_iam_policy_name = try(coalesce(var.cloudtrail_iam_policy_name, "${var.name}-cloudtrail-to-cloudwatch"), null)
cloudtrail_iam_role_name_prefix = try(coalesce(var.cloudtrail_iam_role_name_prefix, "${var.name}-cloudtrail-role"), null)
cloudtrail_iam_policy_name_prefix = try(coalesce(var.cloudtrail_iam_policy_name_prefix, "${var.name}-cloudtrail-policy"), null)
}
# This policy allows the CloudTrail service for any account to assume this role.
data "aws_iam_policy_document" "cloudtrail_assume_role" {
count = var.create_cloudtrail_iam_role ? 1 : 0
statement {
effect = "Allow"
actions = ["sts:AssumeRole"]
principals {
type = "Service"
identifiers = ["cloudtrail.amazonaws.com"]
}
}
}
# This role is used by CloudTrail to send logs to CloudWatch.
resource "aws_iam_role" "cloudtrail_cloudwatch_role" {
count = var.create_cloudtrail_iam_role ? 1 : 0
name = var.cloudtrail_iam_role_name_use_prefix ? null : local.cloudtrail_iam_role_name
name_prefix = var.cloudtrail_iam_role_name_use_prefix ? local.cloudtrail_iam_role_name_prefix : null
assume_role_policy = data.aws_iam_policy_document.cloudtrail_assume_role[0].json
}
data "aws_iam_policy_document" "cloudtrail_cloudwatch_logs" {
count = var.create_cloudtrail_iam_role ? 1 : 0
statement {
sid = "WriteCloudWatchLogs"
effect = "Allow"
actions = [
"logs:CreateLogStream",
"logs:PutLogEvents",
]
resources = ["arn:${data.aws_partition.current.partition}:logs:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:log-group:${module.cloudwatch_logs_group.cloudwatch_log_group_name}:*"]
}
}
resource "aws_iam_policy" "cloudtrail_cloudwatch_logs" {
count = var.create_cloudtrail_iam_role ? 1 : 0
name = var.cloudtrail_iam_policy_name_use_prefix ? null : local.cloudtrail_iam_policy_name
name_prefix = var.cloudtrail_iam_policy_name_use_prefix ? local.cloudtrail_iam_policy_name_prefix : null
policy = data.aws_iam_policy_document.cloudtrail_cloudwatch_logs[0].json
}
resource "aws_iam_role_policy_attachment" "main" {
count = var.create_cloudtrail_iam_role ? 1 : 0
policy_arn = aws_iam_policy.cloudtrail_cloudwatch_logs[0].arn
role = aws_iam_role.cloudtrail_cloudwatch_role[0].name
}
#endregion
################################################################################
# CloudWatch Log Group
################################################################################
#region
locals {
cloudwatch_logs_group_name = try(coalesce(var.cloudwatch_logs_group_name, "${var.name}-cloudtrail"), null)
cloudwatch_logs_group_name_prefix = try(coalesce(var.cloudwatch_logs_group_name_prefix, "${var.name}-cloudtrail-"), null)
}
module "cloudwatch_logs_group" {
source = "git::https://github.com/terraform-aws-modules/terraform-aws-cloudwatch.git//modules/log-group?ref=v5.3.1"
create = var.create_cloudwatch_logs_group && length(var.cloudwatch_logs_group_arn) == 0
name = var.cloudwatch_logs_group_use_name_prefix ? null : local.cloudwatch_logs_group_name
name_prefix = var.cloudwatch_logs_group_use_name_prefix ? local.cloudwatch_logs_group_name_prefix : null
retention_in_days = var.cloudwatch_logs_group_retention_in_days
kms_key_id = try(coalesce(var.kms_key_arn, module.kms.key_arn), "")
tags = var.tags
}
#endregion
################################################################################
# KMS Key
################################################################################
#region
locals {
# token from: https://docs.aws.amazon.com/awscloudtrail/latest/userguide/default-kms-key-policy.html and other sources
key_statements = [
{
sid = "Enable IAM User Permissions"
effect = "Allow"
actions = ["kms:*"]
resources = ["*"]
principals = [
{
type = "AWS"
identifiers = ["arn:${data.aws_partition.current.partition}:iam::${data.aws_caller_identity.current.account_id}:root"]
}
]
},
{
sid = "Allow CloudTrail to encrypt logs"
effect = "Allow"
actions = ["kms:GenerateDataKey*"]
principals = [
{
type = "Service"
identifiers = ["cloudtrail.amazonaws.com"]
}
]
resources = ["*"]
condition = {
test = "StringLike"
variable = "kms:EncryptionContext:aws:cloudtrail:arn"
values = ["arn:${data.aws_partition.current.partition}:cloudtrail:*:${data.aws_caller_identity.current.account_id}:trail/*"]
}
},
{
sid = "Allow CloudTrail to describe key"
effect = "Allow"
actions = ["kms:DescribeKey"]
principals = [
{
type = "Service"
identifiers = ["cloudtrail.amazonaws.com"]
}
]
resources = ["*"]
},
{
sid = "Allow principals in the account to decrypt log files"
effect = "Allow"
actions = ["kms:Decrypt", "kms:ReEncryptFrom"]
principals = [
{
type = "AWS"
identifiers = ["*"]
}
]
resources = ["*"]
condition = {
test = "StringEquals"
variable = "kms:CallerAccount"
values = [data.aws_caller_identity.current.account_id]
}
condition = {
test = "StringLike"
variable = "kms:EncryptionContext:aws:cloudtrail:arn"
values = ["arn:${data.aws_partition.current.partition}:cloudtrail:*:${data.aws_caller_identity.current.account_id}:trail/*"]
}
},
{
sid = "Allow alias creation during setup"
effect = "Allow"
actions = ["kms:CreateAlias"]
principals = [
{
type = "AWS"
identifiers = ["*"]
}
]
condition = {
test = "StringEquals"
variable = "kms:ViaService"
values = ["ec2.${data.aws_region.current.name}.amazonaws.com"]
}
condition = {
test = "StringEquals"
variable = "kms:CallerAccount"
values = [data.aws_caller_identity.current.account_id]
}
resources = ["*"]
},
{
sid = "Enable cross account log decryption"
effect = "Allow"
actions = ["kms:Decrypt", "kms:ReEncryptFrom"]
principals = [
{
type = "AWS"
identifiers = ["*"]
}
]
condition = {
test = "StringEquals"
variable = "kms:CallerAccount"
values = [data.aws_caller_identity.current.account_id]
}
condition = {
test = "StringLike"
variable = "kms:EncryptionContext:aws:cloudtrail:arn"
values = ["arn:${data.aws_partition.current.partition}:cloudtrail:*:${data.aws_caller_identity.current.account_id}:trail/*"]
}
resources = ["*"]
},
{
sid = "Allow logs KMS access"
effect = "Allow"
principals = [
{
type = "Service"
identifiers = ["logs.${data.aws_region.current.name}.amazonaws.com"]
}
]
actions = ["kms:Encrypt*", "kms:Decrypt*", "kms:ReEncrypt*", "kms:GenerateDataKey*", "kms:Describe*"]
resources = ["*"]
},
{
sid = "Allow Cloudtrail to decrypt and generate key for sns access"
effect = "Allow"
principals = [
{
type = "Service"
identifiers = ["cloudtrail.amazonaws.com"]
}
]
actions = ["kms:Decrypt*", "kms:GenerateDataKey*"]
resources = ["*"]
}
]
kms_key_description = try(coalesce(var.kms_key_description, "${var.name} cloudtrail encryption key"), null)
kms_key_administrators = try(coalescelist(var.kms_key_administrators, [data.aws_iam_session_context.current.issuer_arn]), [])
kms_key_users = try(coalescelist(var.kms_key_users, [data.aws_iam_session_context.current.issuer_arn]), [])
kms_key_statements = try(coalescelist(var.kms_key_statements, local.key_statements), [])
}
module "kms" {
source = "git::https://github.com/terraform-aws-modules/terraform-aws-kms.git?ref=v2.2.1"
create = var.create_kms_key
description = local.kms_key_description
key_usage = "ENCRYPT_DECRYPT"
deletion_window_in_days = var.kms_key_deletion_window_in_days
enable_key_rotation = var.enable_kms_key_rotation
# Policy
enable_default_policy = var.kms_key_enable_default_policy
key_owners = var.kms_key_owners
key_administrators = local.kms_key_administrators
key_users = local.kms_key_users
key_service_users = var.kms_key_service_users
source_policy_documents = var.kms_key_source_policy_documents
override_policy_documents = var.kms_key_override_policy_documents
key_statements = local.kms_key_statements
# Aliases
aliases = var.kms_key_aliases
computed_aliases = {
# Computed since users can pass in computed values for cloudtrail name such as random provider resources
cloudtrail = { name = "cloudtrail/${var.name}" }
}
tags = var.tags
}
#endregion
################################################################################
# CloudTrail
################################################################################
#region
locals {
cloudtrail_s3_bucket_name = try(coalesce(var.s3_bucket_name, module.s3_bucket.s3_bucket_id), null)
cloudtrail_cloud_watch_logs_role_arn = try(coalesce(var.cloudwatch_logs_role_arn, aws_iam_role.cloudtrail_cloudwatch_role[0].arn), null)
cloudtrail_cloud_watch_logs_group_arn = try(coalesce(var.cloudwatch_logs_group_arn, "${module.cloudwatch_logs_group.cloudwatch_log_group_arn}:*"), null) # CloudTrail requires the Log Stream wildcard
cloudtrail_kms_key_id = try(coalesce(var.kms_key_arn, module.kms.key_arn), null)
}
resource "aws_cloudtrail" "this" {
# checkov:skip=CKV_AWS_252: "Ensure CloudTrail defines an SNS Topic"
# checkov:skip=CKV2_AWS_10
name = var.name
s3_bucket_name = local.cloudtrail_s3_bucket_name
include_global_service_events = var.include_global_service_events
is_multi_region_trail = var.is_multi_region_trail
enable_log_file_validation = var.enable_log_file_validation
cloud_watch_logs_role_arn = local.cloudtrail_cloud_watch_logs_role_arn
cloud_watch_logs_group_arn = local.cloudtrail_cloud_watch_logs_group_arn
kms_key_id = local.cloudtrail_kms_key_id
enable_logging = var.enable_logging
is_organization_trail = var.is_organization_trail
s3_key_prefix = var.s3_key_prefix
sns_topic_name = var.sns_topic_name
dynamic "event_selector" {
for_each = var.event_selectors
content {
include_management_events = lookup(event_selector.value, "include_management_events", null)
read_write_type = lookup(event_selector.value, "read_write_type", null)
exclude_management_event_sources = lookup(event_selector.value, "exclude_management_event_sources", null)
dynamic "data_resource" {
for_each = lookup(event_selector.value, "data_resources", [])
content {
type = data_resource.value.type
values = data_resource.value.values
}
}
}
}
dynamic "advanced_event_selector" {
for_each = var.advanced_event_selectors
content {
name = advanced_event_selector.value.name
dynamic "field_selector" {
for_each = lookup(advanced_event_selector.value, "field_selectors", [])
content {
field = field_selector.value.field
equals = lookup(field_selector.value, "equals", null)
not_equals = lookup(field_selector.value, "not_equals", null)
starts_with = lookup(field_selector.value, "starts_with", null)
ends_with = lookup(field_selector.value, "ends_with", null)
not_starts_with = lookup(field_selector.value, "not_starts_with", null)
not_ends_with = lookup(field_selector.value, "not_ends_with", null)
}
}
}
}
dynamic "insight_selector" {
for_each = var.insight_selectors
content {
insight_type = insight_selector.value
}
}
tags = var.tags
}
#endregion