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vpc-flow-logs.tf
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locals {
# Only create flow log if user selected to create a VPC as well
enable_flow_log = var.create_vpc && var.enable_flow_log
create_flow_log_cloudwatch_iam_role = local.enable_flow_log && var.flow_log_destination_type != "s3" && var.create_flow_log_cloudwatch_iam_role
create_flow_log_cloudwatch_log_group = local.enable_flow_log && var.flow_log_destination_type != "s3" && var.create_flow_log_cloudwatch_log_group
flow_log_destination_arn = local.create_flow_log_cloudwatch_log_group ? aws_cloudwatch_log_group.flow_log[0].arn : var.flow_log_destination_arn
flow_log_iam_role_arn = var.flow_log_destination_type != "s3" && local.create_flow_log_cloudwatch_iam_role ? aws_iam_role.vpc_flow_log_cloudwatch[0].arn : var.flow_log_cloudwatch_iam_role_arn
}
###################
# Flow Log
###################
resource "aws_flow_log" "this" {
count = local.enable_flow_log ? 1 : 0
log_destination_type = var.flow_log_destination_type
log_destination = local.flow_log_destination_arn
log_format = var.flow_log_log_format
iam_role_arn = local.flow_log_iam_role_arn
traffic_type = var.flow_log_traffic_type
vpc_id = local.vpc_id
max_aggregation_interval = var.flow_log_max_aggregation_interval
tags = merge(var.tags, var.vpc_flow_log_tags)
}
#####################
# Flow Log CloudWatch
#####################
resource "aws_cloudwatch_log_group" "flow_log" {
count = local.create_flow_log_cloudwatch_log_group ? 1 : 0
name = "${var.flow_log_cloudwatch_log_group_name_prefix}${local.vpc_id}"
retention_in_days = var.flow_log_cloudwatch_log_group_retention_in_days
kms_key_id = var.flow_log_cloudwatch_log_group_kms_key_id
tags = merge(var.tags, var.vpc_flow_log_tags)
}
#########################
# Flow Log CloudWatch IAM
#########################
resource "aws_iam_role" "vpc_flow_log_cloudwatch" {
count = local.create_flow_log_cloudwatch_iam_role ? 1 : 0
name_prefix = "vpc-flow-log-role-"
assume_role_policy = data.aws_iam_policy_document.flow_log_cloudwatch_assume_role[0].json
tags = merge(var.tags, var.vpc_flow_log_tags)
}
data "aws_iam_policy_document" "flow_log_cloudwatch_assume_role" {
count = local.create_flow_log_cloudwatch_iam_role ? 1 : 0
statement {
principals {
type = "Service"
identifiers = ["vpc-flow-logs.amazonaws.com"]
}
effect = "Allow"
actions = ["sts:AssumeRole"]
}
}
resource "aws_iam_role_policy_attachment" "vpc_flow_log_cloudwatch" {
count = local.create_flow_log_cloudwatch_iam_role ? 1 : 0
role = aws_iam_role.vpc_flow_log_cloudwatch[0].name
policy_arn = aws_iam_policy.vpc_flow_log_cloudwatch[0].arn
}
resource "aws_iam_policy" "vpc_flow_log_cloudwatch" {
count = local.create_flow_log_cloudwatch_iam_role ? 1 : 0
name_prefix = "vpc-flow-log-to-cloudwatch-"
policy = data.aws_iam_policy_document.vpc_flow_log_cloudwatch[0].json
}
data "aws_iam_policy_document" "vpc_flow_log_cloudwatch" {
count = local.create_flow_log_cloudwatch_iam_role ? 1 : 0
statement {
sid = "AWSVPCFlowLogsPushToCloudWatch"
effect = "Allow"
actions = [
"logs:CreateLogGroup",
"logs:CreateLogStream",
"logs:PutLogEvents",
"logs:DescribeLogGroups",
"logs:DescribeLogStreams",
]
resources = ["*"]
}
}