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A config rule that evaluates whether access logging is enabled on the CloudTrail S3 bucket and the S3 bucket is not publicly accessible.
AWSTemplateFormatVersion: '2010-09-09'
Description: ''
Resources:
CustomConfigRule:
Type: 'AWS::Config::ConfigRule'
Properties:
ConfigRuleName: cloudtrail_s3_access_logging
Scope:
ComplianceResourceTypes:
- 'AWS::CloudTrail::Trail'
- 'AWS::S3::Bucket'
Description: A config rule that evaluates whether access logging is enabled on the CloudTrail S3 bucket and the S3 bucket is not publicly accessible.
Source:
Owner: CUSTOM_LAMBDA
SourceIdentifier:
'Fn::GetAtt':
- LambdaFunctionCustomConfigRule
- Arn
SourceDetails:
- EventSource: aws.config
MessageType: ConfigurationItemChangeNotification
- EventSource: aws.config
MessageType: OversizedConfigurationItemChangeNotification
DependsOn: LambdaInvokePermissionsCustomConfigRule
LambdaInvokePermissionsCustomConfigRule:
Type: 'AWS::Lambda::Permission'
Properties:
FunctionName:
'Fn::GetAtt':
- LambdaFunctionCustomConfigRule
- Arn
Action: 'lambda:InvokeFunction'
Principal: config.amazonaws.com
LambdaFunctionCustomConfigRule:
Type: 'AWS::Lambda::Function'
Properties:
FunctionName: LambdaForcloudtrail_s3_access_logging
Handler: index.lambda_handler
Role:
'Fn::GetAtt':
- LambdaIamRoleCustomConfigRule
- Arn
Runtime: python2.7
Code:
ZipFile:
'Fn::Join':
- |+
- - ''
- import json
- import boto3
- import datetime
- import time
- from botocore.exceptions import ClientError
- 'def lambda_handler(event, context):'
- ' # get the trail for the current region'
- ' client_ct = boto3.client(''cloudtrail'')'
- ' for trail in client_ct.describe_trails(includeShadowTrails = False)[''trailList'']:'
- ' annotation = '''''
- ' is_publicly_accessible = False'
- ' s3_bucket_name = '''''
- ' is_compliant = True'
- ' # check if the cloudtrail s3 bucket is publicly accessible and logged'
- ' if trail[''S3BucketName'']:'
- ' s3_bucket_name = trail[''S3BucketName'']'
- ' client_s=boto3.client(''s3'')'
- ' try:'
- ' for grant in client_s.get_bucket_acl(Bucket = s3_bucket_name)[''Grants'']:'
- ' # verify cloudtrail s3 bucket ACL'
- ' if grant[''Permission''] in [''READ'',''FULL_CONTROL''] and (''URI'' in grant[''Grantee''] and (''AuthenticatedUsers'' in grant[''Grantee''][''URI''] or ''AllUsers'' in grant[''Grantee''][''URI''])):'
- ' is_publicly_accessible = True'
- ' if is_publicly_accessible:'
- ' is_compliant = False'
- ' annotation = annotation + '' The CloudTrail S3 bucket ''{}'' is publicly accessible.''.format(s3_bucket_name)'
- ' # verify cloudtrail s3 bucket logging'
- ' response = client_s.get_bucket_logging(Bucket = s3_bucket_name)'
- ' if ''LoggingEnabled'' not in response:'
- ' is_compliant=False'
- ' annotation = annotation + '' The CloudTrail S3 bucket ''{}'' does not have logging enabled.''.format(s3_bucket_name)'
- ' except Exception as ex:'
- ' print ex'
- ' is_compliant = False'
- ' annotation = annotation + '' There was an error looking up CloudTrail S3 bucket ''{}''.''.format(s3_bucket_name)'
- ' else:'
- ' annotation = annotation + '' CloudTrail is not integrated with S3.'''
- ' result_token = ''No token found.'''
- ' if ''resultToken'' in event: result_token = event[''resultToken'']'
- ' evaluations = ['
- ' {'
- ' ''ComplianceResourceType'': ''AWS::S3::Bucket'','
- ' ''ComplianceResourceId'': s3_bucket_name,'
- ' ''ComplianceType'': ''COMPLIANT'' if is_compliant else ''NON_COMPLIANT'','
- ' ''OrderingTimestamp'': datetime.datetime.now()'
- ' }'
- ' ]'
- ' if is_compliant: annotation = ''Acces logging is enabled on the CloudTrail S3 bucket ''{}'' and the S3 bucket is not publicly accessible''.format(s3_bucket_name)'
- ' if annotation: evaluations[0][''Annotation''] = annotation'
- ' config = boto3.client(''config'')'
- ' config.put_evaluations('
- ' Evaluations = evaluations,'
- ' ResultToken = result_token'
- ' )'
- ''
Timeout: 300
DependsOn: LambdaIamRoleCustomConfigRule
LambdaIamRoleCustomConfigRule:
Type: 'AWS::IAM::Role'
Properties:
RoleName: IAMRoleForcloudtrail_s3_access_loggingHMI
AssumeRolePolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Principal:
Service:
- lambda.amazonaws.com
Action:
- 'sts:AssumeRole'
ManagedPolicyArns:
- 'arn:aws:iam::aws:policy/AWSCloudTrailReadOnlyAccess'
- 'arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess'
- 'arn:aws:iam::aws:policy/service-role/AWSConfigRulesExecutionRole'
- 'arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole'
Parameters: {}
Metadata: {}
Conditions: {}