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main.tf
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# Managed By : CloudDrove
# Description : This Script is used to create CloudTrail.
# Copyright @ CloudDrove. All Right Reserved.
#Module : Labels
#Description : This terraform module is designed to generate consistent label names and tags
# for resources. You can use terraform-labels to implement a strict naming
# convention.
module "labels" {
source = "clouddrove/labels/aws"
version = "0.15.0"
name = var.name
repository = var.repository
environment = var.environment
managedby = var.managedby
attributes = var.attributes
label_order = var.label_order
}
#Module : CLOUDTRAIL
#Description : Terraform module to provision an AWS CloudTrail with encrypted S3 bucket.
# This bucket is used to store CloudTrail logs.
resource "aws_cloudtrail" "default" {
count = var.enabled_cloudtrail == true ? 1 : 0
name = module.labels.id
enable_logging = var.enable_logging
s3_bucket_name = var.s3_bucket_name
enable_log_file_validation = var.enable_log_file_validation
is_multi_region_trail = true
include_global_service_events = var.include_global_service_events
cloud_watch_logs_role_arn = var.cloud_watch_logs_role_arn != "" ? var.cloud_watch_logs_role_arn : aws_iam_role.cloudtrail_cloudwatch_role[0].arn
cloud_watch_logs_group_arn = var.cloud_watch_logs_group_arn != "" ? var.cloud_watch_logs_group_arn : "${aws_cloudwatch_log_group.cloudtrail[0].arn}:*"
kms_key_id = aws_kms_key.cloudtrail.arn
is_organization_trail = var.is_organization_trail
tags = module.labels.tags
sns_topic_name = var.sns_topic_name
dynamic "event_selector" {
for_each = var.event_selector ? [true] : []
content {
read_write_type = var.read_write_type
include_management_events = var.include_management_events
dynamic "data_resource" {
for_each = var.event_selector_data_resource ? ["true"] : []
content {
type = var.data_resource_type
values = var.data_resource_values
}
}
}
}
lifecycle {
ignore_changes = [event_selector]
}
depends_on = [
aws_kms_key.cloudtrail,
]
}
data "aws_caller_identity" "current" {}
data "aws_partition" "current" {}
data "aws_iam_policy_document" "cloudtrail_assume_role" {
statement {
effect = "Allow"
actions = ["sts:AssumeRole"]
principals {
type = "Service"
identifiers = ["cloudtrail.amazonaws.com"]
}
}
}
# This role is used by CloudTrail to send logs to CloudWatch.
resource "aws_iam_role" "cloudtrail_cloudwatch_role" {
count = var.cloud_watch_logs_role_arn == "" ? 1 : 0
name = var.iam_role_name
assume_role_policy = data.aws_iam_policy_document.cloudtrail_assume_role.json
}
resource "aws_cloudwatch_log_group" "cloudtrail" {
count = var.cloud_watch_logs_group_arn == "" ? 1 : 0
name = var.cloudwatch_log_group_name
retention_in_days = var.log_retention_days
kms_key_id = aws_kms_key.cloudtrail.arn
}
data "aws_iam_policy_document" "cloudtrail_cloudwatch_logs" {
count = var.cloud_watch_logs_role_arn == "" ? 1 : 0
statement {
sid = "WriteCloudWatchLogs"
effect = "Allow"
actions = [
"logs:CreateLogStream",
"logs:PutLogEvents",
]
resources = ["${aws_cloudwatch_log_group.cloudtrail[0].arn}:*"]
}
}
resource "aws_iam_policy" "cloudtrail_cloudwatch_logs" {
count = var.cloud_watch_logs_role_arn == "" ? 1 : 0
name = "cloudtrail-cloudwatch-logs-policy"
policy = data.aws_iam_policy_document.cloudtrail_cloudwatch_logs[0].json
}
resource "aws_iam_policy_attachment" "main" {
count = var.cloud_watch_logs_role_arn == "" ? 1 : 0
name = "cloudtrail-cloudwatch-logs-policy-attachment"
policy_arn = aws_iam_policy.cloudtrail_cloudwatch_logs[0].arn
roles = [aws_iam_role.cloudtrail_cloudwatch_role[0].name]
}
resource "aws_kms_key" "cloudtrail" {
description = "A KMS key used to encrypt CloudTrail log files stored in S3."
deletion_window_in_days = var.key_deletion_window_in_days
enable_key_rotation = "true"
policy = data.aws_iam_policy_document.kms.json
tags = module.labels.tags
}
data "aws_iam_policy_document" "kms" {
version = "2012-10-17"
statement {
sid = "Enable IAM User Permissions"
effect = "Allow"
principals {
type = "AWS"
identifiers = ["*"]
}
actions = ["kms:*"]
resources = ["*"]
}
statement {
sid = "Allow CloudTrail to encrypt logs"
effect = "Allow"
principals {
type = "Service"
identifiers = ["cloudtrail.amazonaws.com"]
}
actions = ["kms:GenerateDataKey*"]
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/*"]
}
}
statement {
sid = "Allow CloudTrail to describe key"
effect = "Allow"
principals {
type = "Service"
identifiers = ["cloudtrail.amazonaws.com"]
}
actions = ["kms:DescribeKey"]
resources = ["*"]
}
statement {
sid = "Allow principals in the account to decrypt log files"
effect = "Allow"
principals {
type = "AWS"
identifiers = ["*"]
}
actions = [
"kms:Decrypt",
"kms:ReEncryptFrom"
]
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/*"]
}
}
statement {
sid = "Allow alias creation during setup"
effect = "Allow"
principals {
type = "AWS"
identifiers = ["*"]
}
actions = ["kms:CreateAlias"]
resources = ["*"]
}
}