CloudTrail Not Integrated With CloudWatch

• Query id: 17b30f8f-8dfb-4597-adf6-57600b6cf25e
• Query name: CloudTrail Not Integrated With CloudWatch
• Platform: Terraform
• Severity: Medium
• Category: Observability
• URL: Github

Description

CloudTrail should be integrated with CloudWatch
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - tf file

resource "aws_cloudtrail" "positive1" {
  name                          = "tf-trail-foobar"
  s3_bucket_name                = aws_s3_bucket.foo.id
  s3_key_prefix                 = "prefix"
  include_global_service_events = false
}

data "aws_caller_identity" "current" {}

resource "aws_s3_bucket" "positive4" {
  bucket        = "tf-test-trail"
  force_destroy = true

  policy = <<POLICY
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AWSCloudTrailAclCheck",
            "Effect": "Allow",
            "Principal": {
              "Service": "cloudtrail.amazonaws.com"
            },
            "Action": "s3:GetBucketAcl",
            "Resource": "arn:aws:s3:::tf-test-trail"
        },
        {
            "Sid": "AWSCloudTrailWrite",
            "Effect": "Allow",
            "Principal": {
              "Service": "cloudtrail.amazonaws.com"
            },
            "Action": "s3:PutObject",
            "Resource": "arn:aws:s3:::tf-test-trail/prefix/AWSLogs/${data.aws_caller_identity.current.account_id}/*",
            "Condition": {
                "StringEquals": {
                    "s3:x-amz-acl": "bucket-owner-full-control"
                }
            }
        }
    ]
}
POLICY
}

Code samples without security vulnerabilities

Negative test num. 1 - tf file

resource "aws_cloudwatch_log_group" "cloudtrail_log_group" {
  name = "aws-foundations-benchmark-1-4-0-terraform-3-4-remediated"
}


resource "aws_iam_role" "cloud_watch_logs_role" {
  name = "aws-foundations-benchmark-1-4-0-terraform-3-4-remediated"

  assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "",
      "Effect": "Allow",
      "Principal": {
        "Service": "cloudtrail.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}
EOF
}

resource "aws_iam_role_policy" "cloud_watch_policy" {
  name = "CloudWatch-policy"
  role = aws_iam_role.cloud_watch_logs_role.id

  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "logs:CreateLogStream"
      ],
      "Resource": [
        "${aws_cloudwatch_log_group.cloudtrail_log_group.arn}:*"
      ]
    },
    {
      "Effect": "Allow",
      "Action": [
        "logs:PutLogEvents"
      ],
      "Resource": [
        "${aws_cloudwatch_log_group.cloudtrail_log_group.arn}:*"
      ]
    }
  ]
}
EOF
}


data "aws_caller_identity" "current" {}

resource "aws_cloudtrail" "negative1" {
  name                          = "tf-trail-foobar"
  s3_bucket_name                = aws_s3_bucket.foo.id
  s3_key_prefix                 = "prefix"
  include_global_service_events = false
  cloud_watch_logs_group_arn    = "${aws_cloudwatch_log_group.cloudtrail_log_group.arn}:*"
  cloud_watch_logs_role_arn     = aws_iam_role.cloud_watch_logs_role.arn
}

resource "aws_s3_bucket" "negative2" {
  bucket        = "tf-test-trail"
  force_destroy = true

  policy = <<POLICY
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AWSCloudTrailAclCheck",
            "Effect": "Allow",
            "Principal": {
              "Service": "cloudtrail.amazonaws.com"
            },
            "Action": "s3:GetBucketAcl",
            "Resource": "arn:aws:s3:::tf-test-trail"
        },
        {
            "Sid": "AWSCloudTrailWrite",
            "Effect": "Allow",
            "Principal": {
              "Service": "cloudtrail.amazonaws.com"
            },
            "Action": "s3:PutObject",
            "Resource": "arn:aws:s3:::tf-test-trail/prefix/AWSLogs/${data.aws_caller_identity.current.account_id}/*",
            "Condition": {
                "StringEquals": {
                    "s3:x-amz-acl": "bucket-owner-full-control"
                }
            }
        }
    ]
}
POLICY
}