Terraform Bridgecrew Cloudtrail Integration

Installation Options

This is a terraform module that creates an Amazon Web Services (AWS) CloudTrail integration with Bridgecrew.

Starting fresh

This stack is created with all the best practices and CIS benchmark requirements:

1. A dedicated CMK is created, with rotation enabled.
2. A CloudTrail trail is created, and it's logs are encrypted-at-rest using the dedicated CMK.
3. The logs bucket has Versioning enabled and denies unsecure (non-HTTPS) connections.

Connecting to an existing CloudTrail trail

The module supports connecting to an existing CloudTrail trail. This requires 3 inputs:

1. Setting create_cloudtrail to false.
2. Supplying the name of the bucket where the CloudTrail logs are being saved to, as existing_bucket_name.
3. Supplying the ARN of the SNS used by the trail to notify of new logs, in existing_sns_arn. This can be configured manually on the existing trail.
4. If a KMS key is associated with this CloudTrail, update the key policy to allow Bridgecrew to decrypt. For example:

        {
          "Sid" : "Enable Bridgecrew log decryption",
          "Effect": "Allow",
          "Principal": {
            "AWS" : "arn:aws:iam::${data.aws_caller_identity.current.account_id}:role/${var.company_name}-bc-bridgecrewcwssarole"
          },
          "Action": [ "kms:Decrypt", "kms:ReEncryptFrom" ],
          "Resource": "*",
          "Condition": {
            "StringEquals" : {
              "kms:CallerAccount" : "${data.aws_caller_identity.current.account_id}" },
              "StringLike": {
                "kms:EncryptionContext:aws:cloudtrail:arn" : "arn:aws:cloudtrail:*:${data.aws_caller_identity.current.account_id}:trail/*"
              }
            }
        },

Creating a CloudTrail trail and other infrastructure in separate AWS accounts

This module supports creating a CloudTrail trail in one account, and creating the rest of the infrastructure in a separate account. This may be optimal in cases where you want an organization trail from the organization master, but you want it to send logs to a bucket in a logs account.

In the bucket destination account

1. Set create_cloudtrail to false.
2. Set source_account_id to the account that will host the cloudtrail

In the trail source account

1. Set existing_bucket_name, existing_kms_key_arn, and existing_sns_arn to values output in the previous step
2. Set create_bridgecrew_connection to false

In both accounts, be sure to set the organization_id if this is an organization-wide trail.

Usage

Include module.cloudtrail.tf in your existing Terraform code, and/or see example/examplea as your guide:

module "cloudtrail" {
  source      = "bridgecrewio/bridgecrew-cloudtrail/aws"
  version     = "v1.5.4"
  org_name    = "<your org name>"
  aws_profile = "<aws profile>"
  api-token   = var.api_token
}

Set your api_token as an environmental variable not in your code:

export TF_VAR_api_token= "xxxxxx-xxxxx-xxxx-xxxxxx"

Architecture

Requirements

No requirements.

Providers

Name	Version
aws	n/a
null	n/a
random	n/a
template	n/a

Inputs

Name	Description	Type	Default	Required
account_alias	The alias of the account the CF is deployed in. This will be prepended to all the resources in the stack. Default is {company_name}-bc	string	""	no
api_token	This is your Bridgecrew platform Api token Set as and Environment variable TF_VAR_api_token	string	n/a	yes
aws_profile	The profile that was used to deploy this module. If the default profile / default credentials are used, set this value to null.	string	n/a	yes
bridgecrew_account_id	The Account number of Bridgecrew. Internal use only	string	"890234264427"	no
company_name	The name of the company the integration is for. Must be alphanumeric.	string	n/a	yes
create_bridgecrew_connection	Indicate whether the SQS queue and IAM policies for Bridgecrew need to be set up. This may be false if you are connecting a cloudtrail in a new account to an existing bucket.	bool	true	no
create_cloudtrail	Indicate whether a new CloudTrail trail should be created. If not - existing_sns_arn and existing_bucket_name are required parameters.	bool	true	no
existing_bucket_name	When connecting to an existing CloudTrail trail, please supply the existing trail's bucket name (NOT ARN).	string	null	no
existing_sns_arn	When connecting to an existing CloudTrail trail, please supply the existing trail's SNS ARN.	string	null	no
log_file_expiration	n/a	number	30	no
log_file_prefix	The prefix which will be given to all the log files saved to the bucket.	string	""	no
logs_bucket_id	Bucket to place access logs from the cloudtrail bucket	string	null	no
organization_id	ID or the organization (for org-wide cloudtrails)	string	""	no
security_account_id	When connecting to an existing CloudTrail trail, which puts its logs in a bucket which is in another account	string	""	no
topic_name	The SNS topic name for Bridgecrew integration. Internal use only	string	"handle-customer-actions"	no

Outputs

Name	Description
customer_name	The customer name as defined on Bridgecrew signup
deployment_region	The region that the customer ran this module
kms_key_id	The KMS key cloudtrail will use for encryption
role_arn	The cross-account access role ARN for Bridgecrew
s3_bucket_name	The s3 bucket name for cloudtrail.
s3_key_prefix	The s3 log prefix for cloudtrail, inside the bucket.
sns_topic_name	The sns topic cloudtrail will push to.
sqs_queue_arn	The SQS queue ARN to share with Bridgecrew for CloudTrail integration
sqs_queue_url	The SQS queue URL to share with Bridgecrew for CloudTrail integration
template_version	Bridgecrew.io template version.

Related Projects

Check out these related projects.

• terraform-aws-bridgecrew-remediation

Help

Got a question?

File a GitHub issue.

Contributing

Bug Reports & Feature Requests

Please use the issue tracker to report any bugs or file feature requests.

Copyrights

Copyright © 2020-2021 Bridgecrew

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.