def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
super().__init__(scope, id, **kwargs)
core.Tags.of(self).add('backup','true')
self.storage_gateway_bucket = s3.Bucket(self,'StorageBucket',
bucket_name='nbachmei.homenet.storage-gateway.'+ core.Stack.of(self).region,
versioned=False)
# Grant permissions
iam.CfnServiceLinkedRole(self,'StorageGatewayLinkedRole',
aws_service_name='storagegateway.amazonaws.com',
description='Delegation to AWS StorageGateway')
def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
super().__init__(scope, id, **kwargs)
if self.node.try_get_context('vpc_type'):
validate_cdk_json(self)
ES_LOADER_TIMEOUT = 600
######################################################################
# REGION mapping / ELB & Lambda Arch
######################################################################
elb_id_temp = region_info.FactName.ELBV2_ACCOUNT
elb_map_temp = region_info.RegionInfo.region_map(elb_id_temp)
region_dict = {}
for region in elb_map_temp:
# ELB account ID
region_dict[region] = {'ElbV2AccountId': elb_map_temp[region]}
# Lambda Arch
if region in ('us-east-1', 'us-east-2', 'us-west-2', 'ap-south-1',
'ap-southeast-1', 'ap-southeast-2', 'ap-northeast-1',
'eu-central-1', 'eu-west-1', 'eu-west-2'):
region_dict[region]['LambdaArch'] = (
aws_lambda.Architecture.ARM_64.name)
else:
region_dict[region]['LambdaArch'] = (
aws_lambda.Architecture.X86_64.name)
region_mapping = core.CfnMapping(
scope=self, id='RegionMap', mapping=region_dict)
######################################################################
# get params
######################################################################
allow_source_address = core.CfnParameter(
self, 'AllowedSourceIpAddresses', allowed_pattern=r'^[0-9./\s]*',
description='Space-delimited list of CIDR blocks',
default='10.0.0.0/8 172.16.0.0/12 192.168.0.0/16')
sns_email = core.CfnParameter(
self, 'SnsEmail', allowed_pattern=r'^[0-9a-zA-Z@_\-\+\.]*',
description=('Input your email as SNS topic, where Amazon '
'OpenSearch Service will send alerts to'),
default='*****@*****.**')
geoip_license_key = core.CfnParameter(
self, 'GeoLite2LicenseKey', allowed_pattern=r'^[0-9a-zA-Z]{16}$',
default='xxxxxxxxxxxxxxxx',
description=("If you wolud like to enrich geoip locaiton such as "
"IP address's country, get a license key form MaxMind"
" and input the key. If you not, keep "
"xxxxxxxxxxxxxxxx"))
reserved_concurrency = core.CfnParameter(
self, 'ReservedConcurrency', default=10, type='Number',
description=('Input reserved concurrency. Increase this value if '
'there are steady logs delay despite no errors'))
aes_domain_name = self.node.try_get_context('aes_domain_name')
bucket = f'{aes_domain_name}-{core.Aws.ACCOUNT_ID}'
s3bucket_name_geo = f'{bucket}-geo'
s3bucket_name_log = f'{bucket}-log'
s3bucket_name_snapshot = f'{bucket}-snapshot'
# organizations / multiaccount
org_id = self.node.try_get_context('organizations').get('org_id')
org_mgmt_id = self.node.try_get_context(
'organizations').get('management_id')
org_member_ids = self.node.try_get_context(
'organizations').get('member_ids')
no_org_ids = self.node.try_get_context(
'no_organizations').get('aws_accounts')
# Overwrite default S3 bucket name as customer name
temp_geo = self.node.try_get_context('s3_bucket_name').get('geo')
if temp_geo:
s3bucket_name_geo = temp_geo
else:
print('Using default bucket names')
temp_log = self.node.try_get_context('s3_bucket_name').get('log')
if temp_log:
s3bucket_name_log = temp_log
elif org_id or no_org_ids:
s3bucket_name_log = f'{aes_domain_name}-{self.account}-log'
else:
print('Using default bucket names')
temp_snap = self.node.try_get_context('s3_bucket_name').get('snapshot')
if temp_snap:
s3bucket_name_snapshot = temp_snap
else:
print('Using default bucket names')
kms_cmk_alias = self.node.try_get_context('kms_cmk_alias')
if not kms_cmk_alias:
kms_cmk_alias = 'aes-siem-key'
print('Using default key alais')
######################################################################
# deploy VPC when context is defined as using VPC
######################################################################
# vpc_type is 'new' or 'import' or None
vpc_type = self.node.try_get_context('vpc_type')
if vpc_type == 'new':
is_vpc = True
vpc_cidr = self.node.try_get_context('new_vpc_nw_cidr_block')
subnet_cidr_mask = int(
self.node.try_get_context('new_vpc_subnet_cidr_mask'))
is_vpc = True
# VPC
vpc_aes_siem = aws_ec2.Vpc(
self, 'VpcAesSiem', cidr=vpc_cidr,
max_azs=3, nat_gateways=0,
subnet_configuration=[
aws_ec2.SubnetConfiguration(
subnet_type=aws_ec2.SubnetType.ISOLATED,
name='aes-siem-subnet', cidr_mask=subnet_cidr_mask)])
subnet1 = vpc_aes_siem.isolated_subnets[0]
subnets = [{'subnet_type': aws_ec2.SubnetType.ISOLATED}]
vpc_subnets = aws_ec2.SubnetSelection(
subnet_type=aws_ec2.SubnetType.ISOLATED)
vpc_aes_siem_opt = vpc_aes_siem.node.default_child.cfn_options
vpc_aes_siem_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
for subnet in vpc_aes_siem.isolated_subnets:
subnet_opt = subnet.node.default_child.cfn_options
subnet_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
elif vpc_type == 'import':
vpc_id = self.node.try_get_context('imported_vpc_id')
vpc_aes_siem = aws_ec2.Vpc.from_lookup(
self, 'VpcAesSiem', vpc_id=vpc_id)
subnet_ids = get_subnet_ids(self)
subnets = []
for number, subnet_id in enumerate(subnet_ids, 1):
obj_id = 'Subenet' + str(number)
subnet = aws_ec2.Subnet.from_subnet_id(self, obj_id, subnet_id)
subnets.append(subnet)
subnet1 = subnets[0]
vpc_subnets = aws_ec2.SubnetSelection(subnets=subnets)
if vpc_type:
is_vpc = True
# Security Group
sg_vpc_noinbound_aes_siem = aws_ec2.SecurityGroup(
self, 'AesSiemVpcNoinboundSecurityGroup',
security_group_name='aes-siem-noinbound-vpc-sg',
vpc=vpc_aes_siem)
sg_vpc_aes_siem = aws_ec2.SecurityGroup(
self, 'AesSiemVpcSecurityGroup',
security_group_name='aes-siem-vpc-sg',
vpc=vpc_aes_siem)
sg_vpc_aes_siem.add_ingress_rule(
peer=aws_ec2.Peer.ipv4(vpc_aes_siem.vpc_cidr_block),
connection=aws_ec2.Port.tcp(443),)
sg_vpc_opt = sg_vpc_aes_siem.node.default_child.cfn_options
sg_vpc_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
# VPC Endpoint
vpc_aes_siem.add_gateway_endpoint(
'S3Endpoint', service=aws_ec2.GatewayVpcEndpointAwsService.S3,
subnets=subnets)
vpc_aes_siem.add_interface_endpoint(
'SQSEndpoint', security_groups=[sg_vpc_aes_siem],
service=aws_ec2.InterfaceVpcEndpointAwsService.SQS,)
vpc_aes_siem.add_interface_endpoint(
'KMSEndpoint', security_groups=[sg_vpc_aes_siem],
service=aws_ec2.InterfaceVpcEndpointAwsService.KMS,)
else:
is_vpc = False
is_vpc = core.CfnCondition(
self, 'IsVpc', expression=core.Fn.condition_equals(is_vpc, True))
"""
CloudFormation実行時の条件式の書き方
ClassのBasesが aws_cdk.core.Resource の時は、
node.default_child.cfn_options.condition = is_vpc
ClassのBasesが aws_cdk.core.CfnResource の時は、
cfn_options.condition = is_vpc
"""
######################################################################
# create cmk of KMS to encrypt S3 bucket
######################################################################
kms_aes_siem = aws_kms.Key(
self, 'KmsAesSiemLog', description='CMK for SIEM solution',
removal_policy=core.RemovalPolicy.RETAIN)
aws_kms.Alias(
self, 'KmsAesSiemLogAlias', alias_name=kms_cmk_alias,
target_key=kms_aes_siem,
removal_policy=core.RemovalPolicy.RETAIN)
kms_aes_siem.add_to_resource_policy(
aws_iam.PolicyStatement(
sid='Allow GuardDuty to use the key',
actions=['kms:GenerateDataKey'],
principals=[aws_iam.ServicePrincipal(
'guardduty.amazonaws.com')],
resources=['*'],),)
kms_aes_siem.add_to_resource_policy(
aws_iam.PolicyStatement(
sid='Allow VPC Flow Logs to use the key',
actions=['kms:Encrypt', 'kms:Decrypt', 'kms:ReEncrypt*',
'kms:GenerateDataKey*', 'kms:DescribeKey'],
principals=[aws_iam.ServicePrincipal(
'delivery.logs.amazonaws.com')],
resources=['*'],),)
# basic policy
key_policy_basic1 = aws_iam.PolicyStatement(
sid='Allow principals in the account to decrypt log files',
actions=['kms:DescribeKey', 'kms:ReEncryptFrom'],
principals=[aws_iam.AccountPrincipal(
account_id=core.Aws.ACCOUNT_ID)],
resources=['*'],)
kms_aes_siem.add_to_resource_policy(key_policy_basic1)
# for Athena
key_policy_athena = aws_iam.PolicyStatement(
sid='Allow Athena to query s3 objects with this key',
actions=['kms:Decrypt', 'kms:DescribeKey', 'kms:Encrypt',
'kms:GenerateDataKey*', 'kms:ReEncrypt*'],
principals=[aws_iam.AccountPrincipal(
account_id=core.Aws.ACCOUNT_ID)],
resources=['*'],
conditions={'ForAnyValue:StringEquals': {
'aws:CalledVia': 'athena.amazonaws.com'}})
kms_aes_siem.add_to_resource_policy(key_policy_athena)
# for CloudTrail
key_policy_trail1 = aws_iam.PolicyStatement(
sid='Allow CloudTrail to describe key',
actions=['kms:DescribeKey'],
principals=[aws_iam.ServicePrincipal('cloudtrail.amazonaws.com')],
resources=['*'],)
kms_aes_siem.add_to_resource_policy(key_policy_trail1)
key_policy_trail2 = aws_iam.PolicyStatement(
sid=('Allow CloudTrail to encrypt logs'),
actions=['kms:GenerateDataKey*'],
principals=[aws_iam.ServicePrincipal(
'cloudtrail.amazonaws.com')],
resources=['*'],
conditions={'StringLike': {
'kms:EncryptionContext:aws:cloudtrail:arn': [
f'arn:aws:cloudtrail:*:{core.Aws.ACCOUNT_ID}:trail/*']}})
kms_aes_siem.add_to_resource_policy(key_policy_trail2)
######################################################################
# create s3 bucket
######################################################################
block_pub = aws_s3.BlockPublicAccess(
block_public_acls=True,
ignore_public_acls=True,
block_public_policy=True,
restrict_public_buckets=True
)
s3_geo = aws_s3.Bucket(
self, 'S3BucketForGeoip', block_public_access=block_pub,
bucket_name=s3bucket_name_geo,
# removal_policy=core.RemovalPolicy.DESTROY,
)
# create s3 bucket for log collector
s3_log = aws_s3.Bucket(
self, 'S3BucketForLog', block_public_access=block_pub,
bucket_name=s3bucket_name_log, versioned=True,
encryption=aws_s3.BucketEncryption.S3_MANAGED,
# removal_policy=core.RemovalPolicy.DESTROY,
)
# create s3 bucket for aes snapshot
s3_snapshot = aws_s3.Bucket(
self, 'S3BucketForSnapshot', block_public_access=block_pub,
bucket_name=s3bucket_name_snapshot,
# removal_policy=core.RemovalPolicy.DESTROY,
)
######################################################################
# IAM Role
######################################################################
# delopyment policy for lambda deploy-aes
arn_prefix = f'arn:aws:logs:{core.Aws.REGION}:{core.Aws.ACCOUNT_ID}'
loggroup_aes = f'log-group:/aws/aes/domains/{aes_domain_name}/*'
loggroup_opensearch = (
f'log-group:/aws/OpenSearchService/domains/{aes_domain_name}/*')
loggroup_lambda = 'log-group:/aws/lambda/aes-siem-*'
policydoc_create_loggroup = aws_iam.PolicyDocument(
statements=[
aws_iam.PolicyStatement(
actions=[
'logs:PutResourcePolicy',
'logs:DescribeLogGroups',
'logs:DescribeLogStreams'
],
resources=[f'{arn_prefix}:*', ]
),
aws_iam.PolicyStatement(
actions=[
'logs:CreateLogGroup', 'logs:CreateLogStream',
'logs:PutLogEvents', 'logs:PutRetentionPolicy'],
resources=[
f'{arn_prefix}:{loggroup_aes}',
f'{arn_prefix}:{loggroup_opensearch}',
f'{arn_prefix}:{loggroup_lambda}',
],
)
]
)
policydoc_crhelper = aws_iam.PolicyDocument(
statements=[
aws_iam.PolicyStatement(
actions=[
'lambda:AddPermission',
'lambda:RemovePermission',
'events:ListRules',
'events:PutRule',
'events:DeleteRule',
'events:PutTargets',
'events:RemoveTargets'],
resources=['*']
)
]
)
# snaphot rule for AES
policydoc_snapshot = aws_iam.PolicyDocument(
statements=[
aws_iam.PolicyStatement(
actions=['s3:ListBucket'],
resources=[s3_snapshot.bucket_arn]
),
aws_iam.PolicyStatement(
actions=['s3:GetObject', 's3:PutObject',
's3:DeleteObject'],
resources=[s3_snapshot.bucket_arn + '/*']
)
]
)
aes_siem_snapshot_role = aws_iam.Role(
self, 'AesSiemSnapshotRole',
role_name='aes-siem-snapshot-role',
inline_policies=[policydoc_snapshot, ],
assumed_by=aws_iam.ServicePrincipal('es.amazonaws.com')
)
policydoc_assume_snapshrole = aws_iam.PolicyDocument(
statements=[
aws_iam.PolicyStatement(
actions=['iam:PassRole'],
resources=[aes_siem_snapshot_role.role_arn]
),
]
)
aes_siem_deploy_role_for_lambda = aws_iam.Role(
self, 'AesSiemDeployRoleForLambda',
role_name='aes-siem-deploy-role-for-lambda',
managed_policies=[
aws_iam.ManagedPolicy.from_aws_managed_policy_name(
'AmazonOpenSearchServiceFullAccess'),
aws_iam.ManagedPolicy.from_aws_managed_policy_name(
'service-role/AWSLambdaBasicExecutionRole'),
],
inline_policies=[policydoc_assume_snapshrole, policydoc_snapshot,
policydoc_create_loggroup, policydoc_crhelper],
assumed_by=aws_iam.ServicePrincipal('lambda.amazonaws.com')
)
if vpc_type:
aes_siem_deploy_role_for_lambda.add_managed_policy(
aws_iam.ManagedPolicy.from_aws_managed_policy_name(
'service-role/AWSLambdaVPCAccessExecutionRole')
)
# for alert from Amazon OpenSearch Service
aes_siem_sns_role = aws_iam.Role(
self, 'AesSiemSnsRole',
role_name='aes-siem-sns-role',
assumed_by=aws_iam.ServicePrincipal('es.amazonaws.com')
)
# EC2 role
aes_siem_es_loader_ec2_role = aws_iam.Role(
self, 'AesSiemEsLoaderEC2Role',
role_name='aes-siem-es-loader-for-ec2',
assumed_by=aws_iam.ServicePrincipal('ec2.amazonaws.com'),
)
aws_iam.CfnInstanceProfile(
self, 'AesSiemEsLoaderEC2InstanceProfile',
instance_profile_name=aes_siem_es_loader_ec2_role.role_name,
roles=[aes_siem_es_loader_ec2_role.role_name]
)
######################################################################
# in VPC
######################################################################
aes_role_exist = check_iam_role('/aws-service-role/es.amazonaws.com/')
if vpc_type and not aes_role_exist:
slr_aes = aws_iam.CfnServiceLinkedRole(
self, 'AWSServiceRoleForAmazonOpenSearchService',
aws_service_name='es.amazonaws.com',
description='Created by cloudformation of siem stack'
)
slr_aes.cfn_options.deletion_policy = core.CfnDeletionPolicy.RETAIN
######################################################################
# SQS for es-laoder's DLQ
######################################################################
sqs_aes_siem_dlq = aws_sqs.Queue(
self, 'AesSiemDlq', queue_name='aes-siem-dlq',
retention_period=core.Duration.days(14))
sqs_aes_siem_splitted_logs = aws_sqs.Queue(
self, 'AesSiemSqsSplitLogs',
queue_name='aes-siem-sqs-splitted-logs',
dead_letter_queue=aws_sqs.DeadLetterQueue(
max_receive_count=2, queue=sqs_aes_siem_dlq),
visibility_timeout=core.Duration.seconds(ES_LOADER_TIMEOUT),
retention_period=core.Duration.days(14))
######################################################################
# Setup Lambda
######################################################################
# setup lambda of es_loader
lambda_es_loader_vpc_kwargs = {}
if vpc_type:
lambda_es_loader_vpc_kwargs = {
'security_group': sg_vpc_noinbound_aes_siem,
'vpc': vpc_aes_siem,
'vpc_subnets': vpc_subnets,
}
lambda_es_loader = aws_lambda.Function(
self, 'LambdaEsLoader', **lambda_es_loader_vpc_kwargs,
function_name='aes-siem-es-loader',
description=f'{SOLUTION_NAME} / es-loader',
runtime=aws_lambda.Runtime.PYTHON_3_8,
architecture=aws_lambda.Architecture.X86_64,
# architecture=region_mapping.find_in_map(
# core.Aws.REGION, 'LambdaArm'),
# code=aws_lambda.Code.asset('../lambda/es_loader.zip'),
code=aws_lambda.Code.asset('../lambda/es_loader'),
handler='index.lambda_handler',
memory_size=2048,
timeout=core.Duration.seconds(ES_LOADER_TIMEOUT),
reserved_concurrent_executions=(
reserved_concurrency.value_as_number),
dead_letter_queue_enabled=True,
dead_letter_queue=sqs_aes_siem_dlq,
environment={
'GEOIP_BUCKET': s3bucket_name_geo, 'LOG_LEVEL': 'info',
'POWERTOOLS_LOGGER_LOG_EVENT': 'false',
'POWERTOOLS_SERVICE_NAME': 'es-loader',
'POWERTOOLS_METRICS_NAMESPACE': 'SIEM'})
es_loader_newver = lambda_es_loader.add_version(
name=__version__, description=__version__)
es_loader_opt = es_loader_newver.node.default_child.cfn_options
es_loader_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
# send only
# sqs_aes_siem_dlq.grant(lambda_es_loader, 'sqs:SendMessage')
# send and reieve. but it must be loop
sqs_aes_siem_dlq.grant(
lambda_es_loader, 'sqs:SendMessage', 'sqs:ReceiveMessage',
'sqs:DeleteMessage', 'sqs:GetQueueAttributes')
sqs_aes_siem_splitted_logs.grant(
lambda_es_loader, 'sqs:SendMessage', 'sqs:ReceiveMessage',
'sqs:DeleteMessage', 'sqs:GetQueueAttributes')
lambda_es_loader.add_event_source(
aws_lambda_event_sources.SqsEventSource(
sqs_aes_siem_splitted_logs, batch_size=1))
# es-loaer on EC2 role
sqs_aes_siem_dlq.grant(
aes_siem_es_loader_ec2_role, 'sqs:GetQueue*', 'sqs:ListQueues*',
'sqs:ReceiveMessage*', 'sqs:DeleteMessage*')
lambda_geo = aws_lambda.Function(
self, 'LambdaGeoipDownloader',
function_name='aes-siem-geoip-downloader',
description=f'{SOLUTION_NAME} / geoip-downloader',
runtime=aws_lambda.Runtime.PYTHON_3_8,
architecture=aws_lambda.Architecture.X86_64,
# architecture=region_mapping.find_in_map(
# core.Aws.REGION, 'LambdaArm'),
code=aws_lambda.Code.asset('../lambda/geoip_downloader'),
handler='index.lambda_handler',
memory_size=320,
timeout=core.Duration.seconds(300),
environment={
's3bucket_name': s3bucket_name_geo,
'license_key': geoip_license_key.value_as_string,
}
)
lambda_geo_newver = lambda_geo.add_version(
name=__version__, description=__version__)
lamba_geo_opt = lambda_geo_newver.node.default_child.cfn_options
lamba_geo_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
######################################################################
# setup OpenSearch Service
######################################################################
lambda_deploy_es = aws_lambda.Function(
self, 'LambdaDeployAES',
function_name='aes-siem-deploy-aes',
description=f'{SOLUTION_NAME} / opensearch domain deployment',
runtime=aws_lambda.Runtime.PYTHON_3_8,
architecture=aws_lambda.Architecture.X86_64,
# architecture=region_mapping.find_in_map(
# core.Aws.REGION, 'LambdaArm'),
# code=aws_lambda.Code.asset('../lambda/deploy_es.zip'),
code=aws_lambda.Code.asset('../lambda/deploy_es'),
handler='index.aes_domain_handler',
memory_size=128,
timeout=core.Duration.seconds(300),
environment={
'accountid': core.Aws.ACCOUNT_ID,
'aes_domain_name': aes_domain_name,
'aes_admin_role': aes_siem_deploy_role_for_lambda.role_arn,
'es_loader_role': lambda_es_loader.role.role_arn,
'allow_source_address': allow_source_address.value_as_string,
},
role=aes_siem_deploy_role_for_lambda,
)
lambda_deploy_es.add_environment(
's3_snapshot', s3_snapshot.bucket_name)
if vpc_type:
lambda_deploy_es.add_environment(
'vpc_subnet_id', subnet1.subnet_id)
lambda_deploy_es.add_environment(
'security_group_id', sg_vpc_aes_siem.security_group_id)
else:
lambda_deploy_es.add_environment('vpc_subnet_id', 'None')
lambda_deploy_es.add_environment('security_group_id', 'None')
deploy_es_newver = lambda_deploy_es.add_version(
name=__version__, description=__version__)
deploy_es_opt = deploy_es_newver.node.default_child.cfn_options
deploy_es_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
# execute lambda_deploy_es to deploy Amaozon ES Domain
aes_domain = aws_cloudformation.CfnCustomResource(
self, 'AesSiemDomainDeployedR2',
service_token=lambda_deploy_es.function_arn,)
aes_domain.add_override('Properties.ConfigVersion', __version__)
es_endpoint = aes_domain.get_att('es_endpoint').to_string()
lambda_es_loader.add_environment('ES_ENDPOINT', es_endpoint)
lambda_es_loader.add_environment(
'SQS_SPLITTED_LOGS_URL', sqs_aes_siem_splitted_logs.queue_url)
lambda_configure_es_vpc_kwargs = {}
if vpc_type:
lambda_configure_es_vpc_kwargs = {
'security_group': sg_vpc_noinbound_aes_siem,
'vpc': vpc_aes_siem,
'vpc_subnets': aws_ec2.SubnetSelection(subnets=[subnet1, ]), }
lambda_configure_es = aws_lambda.Function(
self, 'LambdaConfigureAES', **lambda_configure_es_vpc_kwargs,
function_name='aes-siem-configure-aes',
description=f'{SOLUTION_NAME} / opensearch configuration',
runtime=aws_lambda.Runtime.PYTHON_3_8,
architecture=aws_lambda.Architecture.X86_64,
# architecture=region_mapping.find_in_map(
# core.Aws.REGION, 'LambdaArm'),
code=aws_lambda.Code.asset('../lambda/deploy_es'),
handler='index.aes_config_handler',
memory_size=128,
timeout=core.Duration.seconds(300),
environment={
'accountid': core.Aws.ACCOUNT_ID,
'aes_domain_name': aes_domain_name,
'aes_admin_role': aes_siem_deploy_role_for_lambda.role_arn,
'es_loader_role': lambda_es_loader.role.role_arn,
'allow_source_address': allow_source_address.value_as_string,
'es_endpoint': es_endpoint,
},
role=aes_siem_deploy_role_for_lambda,
)
lambda_configure_es.add_environment(
's3_snapshot', s3_snapshot.bucket_name)
if vpc_type:
lambda_configure_es.add_environment(
'vpc_subnet_id', subnet1.subnet_id)
lambda_configure_es.add_environment(
'security_group_id', sg_vpc_aes_siem.security_group_id)
else:
lambda_configure_es.add_environment('vpc_subnet_id', 'None')
lambda_configure_es.add_environment('security_group_id', 'None')
configure_es_newver = lambda_configure_es.add_version(
name=__version__, description=__version__)
configure_es_opt = configure_es_newver.node.default_child.cfn_options
configure_es_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
aes_config = aws_cloudformation.CfnCustomResource(
self, 'AesSiemDomainConfiguredR2',
service_token=lambda_configure_es.function_arn,)
aes_config.add_override('Properties.ConfigVersion', __version__)
aes_config.add_depends_on(aes_domain)
aes_config.cfn_options.deletion_policy = core.CfnDeletionPolicy.RETAIN
es_arn = (f'arn:aws:es:{core.Aws.REGION}:{core.Aws.ACCOUNT_ID}'
f':domain/{aes_domain_name}')
# grant permission to es_loader role
inline_policy_to_load_entries_into_es = aws_iam.Policy(
self, 'aes-siem-policy-to-load-entries-to-es',
policy_name='aes-siem-policy-to-load-entries-to-es',
statements=[
aws_iam.PolicyStatement(
actions=['es:*'],
resources=[es_arn + '/*', ]),
]
)
lambda_es_loader.role.attach_inline_policy(
inline_policy_to_load_entries_into_es)
aes_siem_es_loader_ec2_role.attach_inline_policy(
inline_policy_to_load_entries_into_es)
# grant additional permission to es_loader role
additional_kms_cmks = self.node.try_get_context('additional_kms_cmks')
if additional_kms_cmks:
inline_policy_access_to_additional_cmks = aws_iam.Policy(
self, 'access_to_additional_cmks',
policy_name='access_to_additional_cmks',
statements=[
aws_iam.PolicyStatement(
actions=['kms:Decrypt'],
resources=sorted(set(additional_kms_cmks))
)
]
)
lambda_es_loader.role.attach_inline_policy(
inline_policy_access_to_additional_cmks)
aes_siem_es_loader_ec2_role.attach_inline_policy(
inline_policy_access_to_additional_cmks)
additional_buckets = self.node.try_get_context('additional_s3_buckets')
if additional_buckets:
buckets_list = []
for bucket in additional_buckets:
buckets_list.append(f'arn:aws:s3:::{bucket}')
buckets_list.append(f'arn:aws:s3:::{bucket}/*')
inline_policy_access_to_additional_buckets = aws_iam.Policy(
self, 'access_to_additional_buckets',
policy_name='access_to_additional_buckets',
statements=[
aws_iam.PolicyStatement(
actions=['s3:GetObject*', 's3:GetBucket*', 's3:List*'],
resources=sorted(set(buckets_list))
)
]
)
lambda_es_loader.role.attach_inline_policy(
inline_policy_access_to_additional_buckets)
aes_siem_es_loader_ec2_role.attach_inline_policy(
inline_policy_access_to_additional_buckets)
kms_aes_siem.grant_decrypt(lambda_es_loader)
kms_aes_siem.grant_decrypt(aes_siem_es_loader_ec2_role)
######################################################################
# s3 notification and grant permisssion
######################################################################
s3_geo.grant_read_write(lambda_geo)
s3_geo.grant_read(lambda_es_loader)
s3_geo.grant_read(aes_siem_es_loader_ec2_role)
s3_log.grant_read(lambda_es_loader)
s3_log.grant_read(aes_siem_es_loader_ec2_role)
# create s3 notification for es_loader
notification = aws_s3_notifications.LambdaDestination(lambda_es_loader)
# assign notification for the s3 PUT event type
# most log system use PUT, but also CLB use POST & Multipart Upload
s3_log.add_event_notification(
aws_s3.EventType.OBJECT_CREATED, notification,
aws_s3.NotificationKeyFilter(prefix='AWSLogs/'))
# For user logs, not AWS logs
s3_log.add_event_notification(
aws_s3.EventType.OBJECT_CREATED, notification,
aws_s3.NotificationKeyFilter(prefix='UserLogs/'))
# Download geoip to S3 once by executing lambda_geo
get_geodb = aws_cloudformation.CfnCustomResource(
self, 'ExecLambdaGeoipDownloader',
service_token=lambda_geo.function_arn,)
get_geodb.cfn_options.deletion_policy = core.CfnDeletionPolicy.RETAIN
# Download geoip every day at 6PM UTC
rule = aws_events.Rule(
self, 'CwlRuleLambdaGeoipDownloaderDilly',
schedule=aws_events.Schedule.rate(core.Duration.hours(12)))
rule.add_target(aws_events_targets.LambdaFunction(lambda_geo))
######################################################################
# bucket policy
######################################################################
s3_awspath = s3_log.bucket_arn + '/AWSLogs/' + core.Aws.ACCOUNT_ID
bucket_policy_common1 = aws_iam.PolicyStatement(
sid='ELB Policy',
principals=[aws_iam.AccountPrincipal(
account_id=region_mapping.find_in_map(
core.Aws.REGION, 'ElbV2AccountId'))],
actions=['s3:PutObject'], resources=[s3_awspath + '/*'],)
# NLB / ALB / R53resolver / VPC Flow Logs
bucket_policy_elb1 = aws_iam.PolicyStatement(
sid='AWSLogDeliveryAclCheck For ALB NLB R53Resolver Flowlogs',
principals=[aws_iam.ServicePrincipal(
'delivery.logs.amazonaws.com')],
actions=['s3:GetBucketAcl', 's3:ListBucket'],
resources=[s3_log.bucket_arn],)
bucket_policy_elb2 = aws_iam.PolicyStatement(
sid='AWSLogDeliveryWrite For ALB NLB R53Resolver Flowlogs',
principals=[aws_iam.ServicePrincipal(
'delivery.logs.amazonaws.com')],
actions=['s3:PutObject'], resources=[s3_awspath + '/*'],
conditions={
'StringEquals': {'s3:x-amz-acl': 'bucket-owner-full-control'}})
s3_log.add_to_resource_policy(bucket_policy_common1)
s3_log.add_to_resource_policy(bucket_policy_elb1)
s3_log.add_to_resource_policy(bucket_policy_elb2)
# CloudTrail
bucket_policy_trail1 = aws_iam.PolicyStatement(
sid='AWSLogDeliveryAclCheck For Cloudtrail',
principals=[aws_iam.ServicePrincipal('cloudtrail.amazonaws.com')],
actions=['s3:GetBucketAcl'], resources=[s3_log.bucket_arn],)
bucket_policy_trail2 = aws_iam.PolicyStatement(
sid='AWSLogDeliveryWrite For CloudTrail',
principals=[aws_iam.ServicePrincipal('cloudtrail.amazonaws.com')],
actions=['s3:PutObject'], resources=[s3_awspath + '/*'],
conditions={
'StringEquals': {'s3:x-amz-acl': 'bucket-owner-full-control'}})
s3_log.add_to_resource_policy(bucket_policy_trail1)
s3_log.add_to_resource_policy(bucket_policy_trail2)
# GuardDuty
bucket_policy_gd1 = aws_iam.PolicyStatement(
sid='Allow GuardDuty to use the getBucketLocation operation',
principals=[aws_iam.ServicePrincipal('guardduty.amazonaws.com')],
actions=['s3:GetBucketLocation'], resources=[s3_log.bucket_arn],)
bucket_policy_gd2 = aws_iam.PolicyStatement(
sid='Allow GuardDuty to upload objects to the bucket',
principals=[aws_iam.ServicePrincipal('guardduty.amazonaws.com')],
actions=['s3:PutObject'], resources=[s3_log.bucket_arn + '/*'],)
bucket_policy_gd5 = aws_iam.PolicyStatement(
sid='Deny non-HTTPS access', effect=aws_iam.Effect.DENY,
actions=['s3:*'], resources=[s3_log.bucket_arn + '/*'],
conditions={'Bool': {'aws:SecureTransport': 'false'}})
bucket_policy_gd5.add_any_principal()
s3_log.add_to_resource_policy(bucket_policy_gd1)
s3_log.add_to_resource_policy(bucket_policy_gd2)
s3_log.add_to_resource_policy(bucket_policy_gd5)
# Config
bucket_policy_config1 = aws_iam.PolicyStatement(
sid='AWSConfig BucketPermissionsCheck and BucketExistenceCheck',
principals=[aws_iam.ServicePrincipal('config.amazonaws.com')],
actions=['s3:GetBucketAcl', 's3:ListBucket'],
resources=[s3_log.bucket_arn],)
bucket_policy_config2 = aws_iam.PolicyStatement(
sid='AWSConfigBucketDelivery',
principals=[aws_iam.ServicePrincipal('config.amazonaws.com')],
actions=['s3:PutObject'], resources=[s3_awspath + '/Config/*'],
conditions={
'StringEquals': {'s3:x-amz-acl': 'bucket-owner-full-control'}})
s3_log.add_to_resource_policy(bucket_policy_config1)
s3_log.add_to_resource_policy(bucket_policy_config2)
# geoip
bucket_policy_geo1 = aws_iam.PolicyStatement(
sid='Allow geoip downloader and es-loader to read/write',
principals=[lambda_es_loader.role, lambda_geo.role],
actions=['s3:PutObject', 's3:GetObject', 's3:DeleteObject'],
resources=[s3_geo.bucket_arn + '/*'],)
s3_geo.add_to_resource_policy(bucket_policy_geo1)
# ES Snapshot
bucket_policy_snapshot = aws_iam.PolicyStatement(
sid='Allow ES to store snapshot',
principals=[aes_siem_snapshot_role],
actions=['s3:PutObject', 's3:GetObject', 's3:DeleteObject'],
resources=[s3_snapshot.bucket_arn + '/*'],)
s3_snapshot.add_to_resource_policy(bucket_policy_snapshot)
######################################################################
# for multiaccount / organizaitons
######################################################################
if org_id or no_org_ids:
##################################################################
# KMS key policy for multiaccount / organizaitons
##################################################################
# for CloudTrail
cond_tail2 = self.make_resource_list(
path='arn:aws:cloudtrail:*:', tail=':trail/*',
keys=self.list_without_none(org_mgmt_id, no_org_ids))
key_policy_mul_trail2 = aws_iam.PolicyStatement(
sid=('Allow CloudTrail to encrypt logs for multiaccounts'),
actions=['kms:GenerateDataKey*'],
principals=[aws_iam.ServicePrincipal(
'cloudtrail.amazonaws.com')],
resources=['*'],
conditions={'StringLike': {
'kms:EncryptionContext:aws:cloudtrail:arn': cond_tail2}})
kms_aes_siem.add_to_resource_policy(key_policy_mul_trail2)
# for replicaiton
key_policy_rep1 = aws_iam.PolicyStatement(
sid=('Enable cross account encrypt access for S3 Cross Region '
'Replication'),
actions=['kms:Encrypt'],
principals=self.make_account_principals(
org_mgmt_id, org_member_ids, no_org_ids),
resources=['*'],)
kms_aes_siem.add_to_resource_policy(key_policy_rep1)
##################################################################
# Buckdet Policy for multiaccount / organizaitons
##################################################################
s3_log_bucket_arn = 'arn:aws:s3:::' + s3bucket_name_log
# for CloudTrail
s3_mulpaths = self.make_resource_list(
path=f'{s3_log_bucket_arn}/AWSLogs/', tail='/*',
keys=self.list_without_none(org_id, org_mgmt_id, no_org_ids))
bucket_policy_org_trail = aws_iam.PolicyStatement(
sid='AWSCloudTrailWrite for Multiaccounts / Organizations',
principals=[
aws_iam.ServicePrincipal('cloudtrail.amazonaws.com')],
actions=['s3:PutObject'], resources=s3_mulpaths,
conditions={'StringEquals': {
's3:x-amz-acl': 'bucket-owner-full-control'}})
s3_log.add_to_resource_policy(bucket_policy_org_trail)
# config
s3_conf_multpaths = self.make_resource_list(
path=f'{s3_log_bucket_arn}/AWSLogs/', tail='/Config/*',
keys=self.list_without_none(org_id, org_mgmt_id, no_org_ids))
bucket_policy_mul_config2 = aws_iam.PolicyStatement(
sid='AWSConfigBucketDelivery',
principals=[aws_iam.ServicePrincipal('config.amazonaws.com')],
actions=['s3:PutObject'], resources=s3_conf_multpaths,
conditions={'StringEquals': {
's3:x-amz-acl': 'bucket-owner-full-control'}})
s3_log.add_to_resource_policy(bucket_policy_mul_config2)
# for replication
bucket_policy_rep1 = aws_iam.PolicyStatement(
sid='PolicyForDestinationBucket / Permissions on objects',
principals=self.make_account_principals(
org_mgmt_id, org_member_ids, no_org_ids),
actions=['s3:ReplicateDelete', 's3:ReplicateObject',
's3:ReplicateTags', 's3:GetObjectVersionTagging',
's3:ObjectOwnerOverrideToBucketOwner'],
resources=[f'{s3_log_bucket_arn}/*'])
bucket_policy_rep2 = aws_iam.PolicyStatement(
sid='PolicyForDestinationBucket / Permissions on bucket',
principals=self.make_account_principals(
org_mgmt_id, org_member_ids, no_org_ids),
actions=['s3:List*', 's3:GetBucketVersioning',
's3:PutBucketVersioning'],
resources=[f'{s3_log_bucket_arn}'])
s3_log.add_to_resource_policy(bucket_policy_rep1)
s3_log.add_to_resource_policy(bucket_policy_rep2)
######################################################################
# SNS topic for Amazon OpenSearch Service Alert
######################################################################
sns_topic = aws_sns.Topic(
self, 'SnsTopic', topic_name='aes-siem-alert',
display_name='AES SIEM')
sns_topic.add_subscription(aws_sns_subscriptions.EmailSubscription(
email_address=sns_email.value_as_string))
sns_topic.grant_publish(aes_siem_sns_role)
######################################################################
# output of CFn
######################################################################
kibanaurl = f'https://{es_endpoint}/_dashboards/'
kibanaadmin = aes_domain.get_att('kibanaadmin').to_string()
kibanapass = aes_domain.get_att('kibanapass').to_string()
core.CfnOutput(self, 'RoleDeploy', export_name='role-deploy',
value=aes_siem_deploy_role_for_lambda.role_arn)
core.CfnOutput(self, 'DashboardsUrl', export_name='dashboards-url',
value=kibanaurl)
core.CfnOutput(self, 'DashboardsPassword',
export_name='dashboards-pass', value=kibanapass,
description=('Please change the password in OpenSearch '
'Dashboards ASAP'))
core.CfnOutput(self, 'DashboardsAdminID',
export_name='dashboards-admin', value=kibanaadmin)
def __init__(self, scope: core.Construct, id: str,vpc: ec2.Vpc, **kwargs) -> None:
super().__init__(scope, id, **kwargs)
prj_name = self.node.try_get_context("project_name")
env_name = self.node.try_get_context("env")
self.lambda_sg = ec2.SecurityGroup(self, 'lambdasg',
security_group_name='lambda-sg',
vpc=vpc,
description="SG for Lambda Functions",
allow_all_outbound=True
)
self.bastion_sg = ec2.SecurityGroup(self, 'bastionsg',
security_group_name='bastion-sg',
vpc=vpc,
description="SG for Bastion Host",
allow_all_outbound=True
)
self.bastion_sg.add_ingress_rule(ec2.Peer.any_ipv4(), ec2.Port.tcp(22), "SSH Access")
redis_sg = ec2.SecurityGroup(self, 'redissg',
security_group_name='redis-sg',
vpc=vpc,
description="SG for Redis Cluster",
allow_all_outbound=True
)
redis_sg.add_ingress_rule(self.lambda_sg, ec2.Port.tcp(6379), 'Access from Lambda functions')
#Kibana
self.kibana_sg = ec2.SecurityGroup(self, 'kibanasg',
security_group_name='kibana-sg',
vpc=vpc,
description='SG for Kibana',
allow_all_outbound=True
)
self.kibana_sg.add_ingress_rule(self.bastion_sg, ec2.Port.tcp(443), "Access from jumpbox")
kibana_role = iam.CfnServiceLinkedRole(self,'kibanarole',
aws_service_name="es.amazonaws.com"
)
lambda_role = iam.Role(self, 'lambdarole',
assumed_by=iam.ServicePrincipal(service='lambda.amazonaws.com'),
role_name='lambda-role',
managed_policies=[iam.ManagedPolicy.from_aws_managed_policy_name(
managed_policy_name='service-role/AWSLambdaVPCAccessExecutionRole'
)]
)
lambda_role.add_to_policy(
statement=iam.PolicyStatement(
actions=['s3:*', 'rds:*'],
resources=['*']
)
)
core.CfnOutput(self, 'redis-export',
export_name='redis-sg-export',
value=redis_sg.security_group_id
)
#SSM Parameters
ssm.StringParameter(self, 'lambdasg-param',
parameter_name='/'+env_name+'/lambda-sg',
string_value=self.lambda_sg.security_group_id
)
ssm.StringParameter(self, 'lambdarole-param-arn',
parameter_name='/'+env_name+'/lambda-role-arn',
string_value=lambda_role.role_arn
)
ssm.StringParameter(self, 'lambdarole-param-name',
parameter_name='/'+env_name+'/lambda-role-name',
string_value=lambda_role.role_name
)
def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
super().__init__(scope, id, **kwargs)
security_distribution_list_email = '*****@*****.**'
# securityhub_instance = securityhub.CfnHub(self, 'SecurityHub')
# Ensure AWS Config is enabled / Ensure CloudTrail is enabled in all Regions 2.1 - 2.8
cloudtrail_bucket_accesslogs = s3.Bucket(
self,
"CloudTrailS3Accesslogs",
block_public_access=s3.BlockPublicAccess.BLOCK_ALL,
encryption=s3.BucketEncryption.S3_MANAGED,
removal_policy=core.RemovalPolicy.RETAIN)
cloudtrail_bucket = s3.Bucket(
self,
"CloudTrailS3",
block_public_access=s3.BlockPublicAccess.BLOCK_ALL,
encryption=s3.BucketEncryption.S3_MANAGED,
removal_policy=core.RemovalPolicy.RETAIN,
server_access_logs_bucket=cloudtrail_bucket_accesslogs,
)
cloudtrail_kms = kms.Key(self,
"CloudTrailKey",
enable_key_rotation=True)
# CloudTrail - single account, not Organization
trail = cloudtrail.Trail(
self,
"CloudTrail",
enable_file_validation=True,
is_multi_region_trail=True,
include_global_service_events=True,
send_to_cloud_watch_logs=True,
cloud_watch_logs_retention=logs.RetentionDays.FOUR_MONTHS,
bucket=cloudtrail_bucket,
kms_key=cloudtrail_kms)
cloudtrail_kms.grant(iam.ServicePrincipal('cloudtrail.amazonaws.com'),
'kms:DescribeKey')
cloudtrail_kms.grant(
iam.ServicePrincipal(
'cloudtrail.amazonaws.com',
conditions={
'StringLike': {
'kms:EncryptionContext:aws:cloudtrail:arn':
'arn:aws:cloudtrail:*:' + core.Stack.of(self).account +
':trail/*'
}
}), 'kms:GenerateDataKey*')
cloudtrail_kms.add_to_resource_policy(
iam.PolicyStatement(
actions=["kms:Decrypt", "kms:ReEncryptFrom"],
conditions={
'StringEquals': {
'kms:CallerAccount': core.Stack.of(self).account
},
'StringLike': {
'kms:EncryptionContext:aws:cloudtrail:arn':
'arn:aws:cloudtrail:*:' + core.Stack.of(self).account +
':trail/*'
}
},
effect=iam.Effect.ALLOW,
principals=[iam.AnyPrincipal()],
resources=['*']))
cloudtrail_kms.add_to_resource_policy(
iam.PolicyStatement(actions=["kms:CreateAlias"],
conditions={
'StringEquals': {
'kms:CallerAccount':
core.Stack.of(self).account,
'kms:ViaService':
'ec2.' + core.Stack.of(self).region +
'.amazonaws.com'
}
},
effect=iam.Effect.ALLOW,
principals=[iam.AnyPrincipal()],
resources=['*']))
cloudtrail_kms.add_to_resource_policy(
iam.PolicyStatement(
actions=["kms:Decrypt", "kms:ReEncryptFrom"],
conditions={
'StringEquals': {
'kms:CallerAccount': core.Stack.of(self).account
},
'StringLike': {
'kms:EncryptionContext:aws:cloudtrail:arn':
'arn:aws:cloudtrail:*:' + core.Stack.of(self).account +
':trail/*'
}
},
effect=iam.Effect.ALLOW,
principals=[iam.AnyPrincipal()],
resources=['*']))
config_role = iam.CfnServiceLinkedRole(
self,
id='ServiceLinkedRoleConfig',
aws_service_name='config.amazonaws.com')
global_config = config.CfnConfigurationRecorder(self, 'ConfigRecorder',
name='default',
# role_arn=config_role.role_arn,
role_arn="arn:aws:iam::" + \
core.Stack.of(
self).account+":role/aws-service-role/config.amazonaws.com/AWSServiceRoleForConfig",
# role_arn=config_role.get_att(
# attribute_name='resource.arn').to_string(),
recording_group=config.CfnConfigurationRecorder.RecordingGroupProperty(
all_supported=True,
include_global_resource_types=True
)
)
config_bucket = s3.Bucket(
self,
"ConfigS3",
block_public_access=s3.BlockPublicAccess.BLOCK_ALL,
encryption=s3.BucketEncryption.S3_MANAGED,
removal_policy=core.RemovalPolicy.RETAIN,
)
config_bucket.add_to_resource_policy(
iam.PolicyStatement(
actions=['s3:GetBucketAcl'],
effect=iam.Effect.ALLOW,
principals=[iam.ServicePrincipal('config.amazonaws.com')],
resources=[config_bucket.bucket_arn]))
config_bucket.add_to_resource_policy(
iam.PolicyStatement(
actions=['s3:PutObject'],
effect=iam.Effect.ALLOW,
principals=[iam.ServicePrincipal('config.amazonaws.com')],
resources=[
config_bucket.arn_for_objects('AWSLogs/' +
core.Stack.of(self).account +
'/Config/*')
],
conditions={
"StringEquals": {
's3:x-amz-acl': 'bucket-owner-full-control',
}
}))
config_delivery_stream = config.CfnDeliveryChannel(
self,
"ConfigDeliveryChannel",
s3_bucket_name=config_bucket.bucket_name)
# Config Aggregator in Organizations account
# config_aggregator = config.CfnConfigurationAggregator(self, 'ConfigAggregator',
# configuration_aggregator_name='ConfigAggregator',
# organization_aggregation_source=config.CfnConfigurationAggregator.OrganizationAggregationSourceProperty(
# role_arn=iam.Role(self, "AWSConfigRoleForOrganizations",
# assumed_by=iam.ServicePrincipal(
# 'config.amazonaws.com'),
# managed_policies=[iam.ManagedPolicy.from_aws_managed_policy_name(
# 'service-role/AWSConfigRoleForOrganizations')]
# ).role_arn,
# all_aws_regions=True
# )
# )
# 2.9 – Ensure VPC flow logging is enabled in all VPCs
# vpc = ec2.Vpc.from_lookup(self, "VPC",
# is_default=True,
# )
# S3 for VPC flow logs
# vpc_flow_logs_bucket = s3.Bucket(self, "VPCFlowLogsBucket",
# block_public_access=s3.BlockPublicAccess.BLOCK_ALL,
# encryption=s3.BucketEncryption.S3_MANAGED,
# removal_policy=core.RemovalPolicy.RETAIN
# )
# Ensure a log metric filter and alarm exist for 3.1 – 3.14
security_notifications_topic = sns.Topic(self,
'CIS_Topic',
display_name='CIS_Topic',
topic_name='CIS_Topic')
sns.Subscription(self,
'CIS_Subscription',
topic=security_notifications_topic,
protocol=sns.SubscriptionProtocol.EMAIL,
endpoint=security_distribution_list_email)
cloudwatch_actions_cis = cloudwatch_actions.SnsAction(
security_notifications_topic)
cis_metricfilter_alarms = {
'CIS-3.1-UnauthorizedAPICalls':
'($.errorCode="*UnauthorizedOperation") || ($.errorCode="AccessDenied*")',
'CIS-3.2-ConsoleSigninWithoutMFA':
'($.eventName="ConsoleLogin") && ($.additionalEventData.MFAUsed !="Yes")',
'RootAccountUsageAlarm':
'$.userIdentity.type="Root" && $.userIdentity.invokedBy NOT EXISTS && $.eventType !="AwsServiceEvent"',
'CIS-3.4-IAMPolicyChanges':
'($.eventName=DeleteGroupPolicy) || ($.eventName=DeleteRolePolicy) || ($.eventName=DeleteUserPolicy) || ($.eventName=PutGroupPolicy) || ($.eventName=PutRolePolicy) || ($.eventName=PutUserPolicy) || ($.eventName=CreatePolicy) || ($.eventName=DeletePolicy) || ($.eventName=CreatePolicyVersion) || ($.eventName=DeletePolicyVersion) || ($.eventName=AttachRolePolicy) || ($.eventName=DetachRolePolicy) || ($.eventName=AttachUserPolicy) || ($.eventName=DetachUserPolicy) || ($.eventName=AttachGroupPolicy) || ($.eventName=DetachGroupPolicy)',
'CIS-3.5-CloudTrailChanges':
'($.eventName=CreateTrail) || ($.eventName=UpdateTrail) || ($.eventName=DeleteTrail) || ($.eventName=StartLogging) || ($.eventName=StopLogging)',
'CIS-3.6-ConsoleAuthenticationFailure':
'($.eventName=ConsoleLogin) && ($.errorMessage="Failed authentication")',
'CIS-3.7-DisableOrDeleteCMK':
'($.eventSource=kms.amazonaws.com) && (($.eventName=DisableKey) || ($.eventName=ScheduleKeyDeletion))',
'CIS-3.8-S3BucketPolicyChanges':
'($.eventSource=s3.amazonaws.com) && (($.eventName=PutBucketAcl) || ($.eventName=PutBucketPolicy) || ($.eventName=PutBucketCors) || ($.eventName=PutBucketLifecycle) || ($.eventName=PutBucketReplication) || ($.eventName=DeleteBucketPolicy) || ($.eventName=DeleteBucketCors) || ($.eventName=DeleteBucketLifecycle) || ($.eventName=DeleteBucketReplication))',
'CIS-3.9-AWSConfigChanges':
'($.eventSource=config.amazonaws.com) && (($.eventName=StopConfigurationRecorder) || ($.eventName=DeleteDeliveryChannel) || ($.eventName=PutDeliveryChannel) || ($.eventName=PutConfigurationRecorder))',
'CIS-3.10-SecurityGroupChanges':
'($.eventName=AuthorizeSecurityGroupIngress) || ($.eventName=AuthorizeSecurityGroupEgress) || ($.eventName=RevokeSecurityGroupIngress) || ($.eventName=RevokeSecurityGroupEgress) || ($.eventName=CreateSecurityGroup) || ($.eventName=DeleteSecurityGroup)',
'CIS-3.11-NetworkACLChanges':
'($.eventName=CreateNetworkAcl) || ($.eventName=CreateNetworkAclEntry) || ($.eventName=DeleteNetworkAcl) || ($.eventName=DeleteNetworkAclEntry) || ($.eventName=ReplaceNetworkAclEntry) || ($.eventName=ReplaceNetworkAclAssociation)',
'CIS-3.12-NetworkGatewayChanges':
'($.eventName=CreateCustomerGateway) || ($.eventName=DeleteCustomerGateway) || ($.eventName=AttachInternetGateway) || ($.eventName=CreateInternetGateway) || ($.eventName=DeleteInternetGateway) || ($.eventName=DetachInternetGateway)',
'CIS-3.13-RouteTableChanges':
'($.eventName=CreateRoute) || ($.eventName=CreateRouteTable) || ($.eventName=ReplaceRoute) || ($.eventName=ReplaceRouteTableAssociation) || ($.eventName=DeleteRouteTable) || ($.eventName=DeleteRoute) || ($.eventName=DisassociateRouteTable)',
'CIS-3.14-VPCChanges':
'($.eventName=CreateVpc) || ($.eventName=DeleteVpc) || ($.eventName=ModifyVpcAttribute) || ($.eventName=AcceptVpcPeeringConnection) || ($.eventName=CreateVpcPeeringConnection) || ($.eventName=DeleteVpcPeeringConnection) || ($.eventName=RejectVpcPeeringConnection) || ($.eventName=AttachClassicLinkVpc) || ($.eventName=DetachClassicLinkVpc) || ($.eventName=DisableVpcClassicLink) || ($.eventName=EnableVpcClassicLink)',
}
for x, y in cis_metricfilter_alarms.items():
str_x = str(x)
str_y = str(y)
logs.MetricFilter(
self,
"MetricFilter_" + str_x,
log_group=trail.log_group,
filter_pattern=logs.JsonPattern(json_pattern_string=str_y),
metric_name=str_x,
metric_namespace="LogMetrics",
metric_value='1')
cloudwatch.Alarm(
self,
"Alarm_" + str_x,
alarm_name=str_x,
alarm_description=str_x,
statistic='Sum',
period=core.Duration.minutes(5),
comparison_operator=cloudwatch.ComparisonOperator.
GREATER_THAN_OR_EQUAL_TO_THRESHOLD,
evaluation_periods=1,
threshold=1,
metric=cloudwatch.Metric(metric_name=str_x,
namespace="LogMetrics"),
).add_alarm_action(cloudwatch_actions_cis)
# IAM Password Policy custom resource CIS 1.5 - 1.11
cfn_template = cfn_inc.CfnInclude(
self,
"includeTemplate",
template_file="account-password-policy.yaml",
parameters={
"MaxPasswordAge": 90,
"MinimumPasswordLength": 14,
"PasswordReusePrevention": 24,
"RequireLowercaseCharacters": True,
"RequireNumbers": True,
"RequireSymbols": True,
"RequireUppercaseCharacters": True,
})
# CIS 1.20
support_role = iam.Role(
self,
"SupportRole",
assumed_by=iam.AccountPrincipal(
account_id=core.Stack.of(self).account),
managed_policies=[
iam.ManagedPolicy.from_aws_managed_policy_name(
'AWSSupportAccess')
],
role_name='AWSSupportAccess')
guardduty_detector = guardduty.CfnDetector(self,
'GuardDutyDetector',
enable=True)
guardduty_event = events.Rule(
self,
'GuardDutyEvent',
rule_name='guardduty-notification',
description='GuardDuty Notification',
event_pattern=events.EventPattern(
source=['aws.guardduty'], detail_type=['GuardDuty Finding']),
targets=[events_targets.SnsTopic(security_notifications_topic)])
def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
super().__init__(scope, id, **kwargs)
######################################################################
# ELB mapping
######################################################################
elb_id_temp = region_info.FactName.ELBV2_ACCOUNT
elb_map_temp = region_info.RegionInfo.region_map(elb_id_temp)
elb_mapping = {}
for key in elb_map_temp:
elb_mapping[key] = {'accountid': elb_map_temp[key]}
elb_accounts = core.CfnMapping(scope=self,
id='ELBv2AccountMap',
mapping=elb_mapping)
######################################################################
# get params
######################################################################
allow_source_address = core.CfnParameter(
self,
'AllowedSourceIpAddresses',
allowed_pattern=r'^[0-9./\s]*',
description='Space-delimited list of CIDR blocks',
default='10.0.0.0/8 172.16.0.0/12 192.168.0.0/16')
sns_email = core.CfnParameter(
self,
'SnsEmail',
allowed_pattern=r'^[0-9a-zA-Z@_\-\+\.]*',
description=('Input your email as SNS topic, where Amazon ES will '
'send alerts to'),
default='*****@*****.**')
geoip_license_key = core.CfnParameter(
self,
'GeoLite2LicenseKey',
allowed_pattern=r'^[0-9a-zA-Z]{16}$',
default='xxxxxxxxxxxxxxxx',
description=("If you wolud like to enrich geoip locaiton such as "
"IP address's country, get a license key form MaxMind"
" and input the key. If you not, keep "
"xxxxxxxxxxxxxxxx"))
aes_domain_name = self.node.try_get_context('aes_domain_name')
bucket = f'{aes_domain_name}-{core.Aws.ACCOUNT_ID}'
s3bucket_name_geo = f'{bucket}-geo'
s3bucket_name_log = f'{bucket}-log'
s3bucket_name_snapshot = f'{bucket}-snapshot'
# organizations / multiaccount
org_id = self.node.try_get_context('organizations').get('org_id')
org_mgmt_id = self.node.try_get_context('organizations').get(
'management_id')
org_member_ids = self.node.try_get_context('organizations').get(
'member_ids')
no_org_ids = self.node.try_get_context('no_organizations').get(
'aws_accounts')
temp_geo = self.node.try_get_context('s3_bucket_name').get('geo')
if temp_geo:
s3bucket_name_geo = temp_geo
temp_log = self.node.try_get_context('s3_bucket_name').get('log')
if temp_log:
s3bucket_name_log = temp_log
elif org_id or no_org_ids:
s3bucket_name_log = f'{aes_domain_name}-{self.account}-log'
temp_snap = self.node.try_get_context('s3_bucket_name').get('snapshot')
if temp_snap:
s3bucket_name_snapshot = temp_snap
kms_cmk_alias = self.node.try_get_context('kms_cmk_alias')
if not kms_cmk_alias:
kms_cmk_alias = 'aes-siem-key'
######################################################################
# deploy VPC when context is defined as using VPC
######################################################################
# vpc_type is 'new' or 'import' or None
vpc_type = self.node.try_get_context('vpc_type')
if vpc_type == 'new':
is_vpc = True
vpc_cidr = self.node.try_get_context('new_vpc_nw_cidr_block')
subnet_cidr_mask = int(
self.node.try_get_context('new_vpc_subnet_cidr_mask'))
is_vpc = True
# VPC
vpc_aes_siem = aws_ec2.Vpc(
self,
'VpcAesSiem',
cidr=vpc_cidr,
max_azs=3,
nat_gateways=0,
subnet_configuration=[
aws_ec2.SubnetConfiguration(
subnet_type=aws_ec2.SubnetType.ISOLATED,
name='aes-siem-subnet',
cidr_mask=subnet_cidr_mask)
])
subnet1 = vpc_aes_siem.isolated_subnets[0]
subnets = [{'subnet_type': aws_ec2.SubnetType.ISOLATED}]
vpc_subnets = aws_ec2.SubnetSelection(
subnet_type=aws_ec2.SubnetType.ISOLATED)
vpc_aes_siem_opt = vpc_aes_siem.node.default_child.cfn_options
vpc_aes_siem_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
for subnet in vpc_aes_siem.isolated_subnets:
subnet_opt = subnet.node.default_child.cfn_options
subnet_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
elif vpc_type == 'import':
vpc_id = self.node.try_get_context('imported_vpc_id')
_sbunet1 = self.node.try_get_context('imported_vpc_subnet1')
_sbunet2 = self.node.try_get_context('imported_vpc_subnet2')
_sbunet3 = self.node.try_get_context('imported_vpc_subnet3')
vpc_aes_siem = aws_ec2.Vpc.from_lookup(self,
'VpcAesSiem',
vpc_id=vpc_id)
subnet1 = aws_ec2.Subnet.from_subnet_attributes(
self, 'Subenet1', **_sbunet1)
subnet2 = aws_ec2.Subnet.from_subnet_attributes(
self, 'Subenet2', **_sbunet2)
subnet3 = aws_ec2.Subnet.from_subnet_attributes(
self, 'Subenet3', **_sbunet3)
subnets = [subnet1, subnet2, subnet3]
vpc_subnets = aws_ec2.SubnetSelection(subnets=subnets)
if vpc_type:
is_vpc = True
# Security Group
sg_vpc_noinbound_aes_siem = aws_ec2.SecurityGroup(
self,
'AesSiemVpcNoinboundSecurityGroup',
security_group_name='aes-siem-noinbound-vpc-sg',
vpc=vpc_aes_siem)
sg_vpc_aes_siem = aws_ec2.SecurityGroup(
self,
'AesSiemVpcSecurityGroup',
security_group_name='aes-siem-vpc-sg',
vpc=vpc_aes_siem)
sg_vpc_aes_siem.add_ingress_rule(
peer=aws_ec2.Peer.ipv4(vpc_aes_siem.vpc_cidr_block),
connection=aws_ec2.Port.tcp(443),
)
sg_vpc_opt = sg_vpc_aes_siem.node.default_child.cfn_options
sg_vpc_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
# VPC Endpoint
vpc_aes_siem.add_gateway_endpoint(
'S3Endpoint',
service=aws_ec2.GatewayVpcEndpointAwsService.S3,
subnets=subnets)
vpc_aes_siem.add_interface_endpoint(
'SQSEndpoint',
security_groups=[sg_vpc_aes_siem],
service=aws_ec2.InterfaceVpcEndpointAwsService.SQS,
)
vpc_aes_siem.add_interface_endpoint(
'KMSEndpoint',
security_groups=[sg_vpc_aes_siem],
service=aws_ec2.InterfaceVpcEndpointAwsService.KMS,
)
vpc_aes_siem.add_interface_endpoint(
'SNSEndpoint',
security_groups=[sg_vpc_aes_siem],
service=aws_ec2.InterfaceVpcEndpointAwsService.SNS,
)
else:
is_vpc = False
is_vpc = core.CfnCondition(self,
'IsVpc',
expression=core.Fn.condition_equals(
is_vpc, True))
"""
CloudFormation実行時の条件式の書き方
ClassのBasesが aws_cdk.core.Resource の時は、
node.default_child.cfn_options.condition = is_vpc
ClassのBasesが aws_cdk.core.CfnResource の時は、
cfn_options.condition = is_vpc
"""
######################################################################
# create cmk of KMS to encrypt S3 bucket
######################################################################
kms_aes_siem = aws_kms.Key(self,
'KmsAesSiemLog',
description='CMK for SIEM solution',
removal_policy=core.RemovalPolicy.RETAIN)
aws_kms.Alias(self,
'KmsAesSiemLogAlias',
alias_name=kms_cmk_alias,
target_key=kms_aes_siem,
removal_policy=core.RemovalPolicy.RETAIN)
kms_aes_siem.add_to_resource_policy(
aws_iam.PolicyStatement(
sid='Allow GuardDuty to use the key',
actions=['kms:GenerateDataKey'],
principals=[
aws_iam.ServicePrincipal('guardduty.amazonaws.com')
],
resources=['*'],
), )
kms_aes_siem.add_to_resource_policy(
aws_iam.PolicyStatement(
sid='Allow VPC Flow Logs to use the key',
actions=[
'kms:Encrypt', 'kms:Decrypt', 'kms:ReEncrypt*',
'kms:GenerateDataKey*', 'kms:DescribeKey'
],
principals=[
aws_iam.ServicePrincipal('delivery.logs.amazonaws.com')
],
resources=['*'],
), )
# basic policy
key_policy_basic1 = aws_iam.PolicyStatement(
sid='Allow principals in the account to decrypt log files',
actions=['kms:DescribeKey', 'kms:ReEncryptFrom'],
principals=[
aws_iam.AccountPrincipal(account_id=core.Aws.ACCOUNT_ID)
],
resources=['*'],
)
kms_aes_siem.add_to_resource_policy(key_policy_basic1)
# for CloudTrail
key_policy_trail1 = aws_iam.PolicyStatement(
sid='Allow CloudTrail to describe key',
actions=['kms:DescribeKey'],
principals=[aws_iam.ServicePrincipal('cloudtrail.amazonaws.com')],
resources=['*'],
)
kms_aes_siem.add_to_resource_policy(key_policy_trail1)
key_policy_trail2 = aws_iam.PolicyStatement(
sid=('Allow CloudTrail to encrypt logs'),
actions=['kms:GenerateDataKey*'],
principals=[aws_iam.ServicePrincipal('cloudtrail.amazonaws.com')],
resources=['*'],
conditions={
'StringLike': {
'kms:EncryptionContext:aws:cloudtrail:arn':
[f'arn:aws:cloudtrail:*:{core.Aws.ACCOUNT_ID}:trail/*']
}
})
kms_aes_siem.add_to_resource_policy(key_policy_trail2)
######################################################################
# create s3 bucket
######################################################################
block_pub = aws_s3.BlockPublicAccess(block_public_acls=True,
ignore_public_acls=True,
block_public_policy=True,
restrict_public_buckets=True)
s3_geo = aws_s3.Bucket(
self,
'S3BucketForGeoip',
block_public_access=block_pub,
bucket_name=s3bucket_name_geo,
# removal_policy=core.RemovalPolicy.DESTROY,
)
# create s3 bucket for log collector
s3_log = aws_s3.Bucket(
self,
'S3BucketForLog',
block_public_access=block_pub,
bucket_name=s3bucket_name_log,
versioned=True,
encryption=aws_s3.BucketEncryption.S3_MANAGED,
# removal_policy=core.RemovalPolicy.DESTROY,
)
# create s3 bucket for aes snapshot
s3_snapshot = aws_s3.Bucket(
self,
'S3BucketForSnapshot',
block_public_access=block_pub,
bucket_name=s3bucket_name_snapshot,
# removal_policy=core.RemovalPolicy.DESTROY,
)
######################################################################
# IAM Role
######################################################################
# snaphot rule for AES
policydoc_snapshot = aws_iam.PolicyDocument(statements=[
aws_iam.PolicyStatement(actions=['s3:ListBucket'],
resources=[s3_snapshot.bucket_arn]),
aws_iam.PolicyStatement(
actions=['s3:GetObject', 's3:PutObject', 's3:DeleteObject'],
resources=[s3_snapshot.bucket_arn + '/*'])
])
aes_siem_snapshot_role = aws_iam.Role(
self,
'AesSiemSnapshotRole',
role_name='aes-siem-snapshot-role',
inline_policies=[
policydoc_snapshot,
],
assumed_by=aws_iam.ServicePrincipal('es.amazonaws.com'))
policydoc_assume_snapshrole = aws_iam.PolicyDocument(statements=[
aws_iam.PolicyStatement(
actions=['iam:PassRole'],
resources=[aes_siem_snapshot_role.role_arn]),
])
aes_siem_deploy_role_for_lambda = aws_iam.Role(
self,
'AesSiemDeployRoleForLambda',
role_name='aes-siem-deploy-role-for-lambda',
managed_policies=[
aws_iam.ManagedPolicy.from_aws_managed_policy_name(
'AmazonESFullAccess'),
aws_iam.ManagedPolicy.from_aws_managed_policy_name(
'service-role/AWSLambdaBasicExecutionRole'),
],
inline_policies=[policydoc_assume_snapshrole, policydoc_snapshot],
assumed_by=aws_iam.ServicePrincipal('lambda.amazonaws.com'))
if vpc_type:
aes_siem_deploy_role_for_lambda.add_managed_policy(
aws_iam.ManagedPolicy.from_aws_managed_policy_name(
'service-role/AWSLambdaVPCAccessExecutionRole'))
# for alert from Amazon ES
aes_siem_sns_role = aws_iam.Role(
self,
'AesSiemSnsRole',
role_name='aes-siem-sns-role',
assumed_by=aws_iam.ServicePrincipal('es.amazonaws.com'))
######################################################################
# in VPC
######################################################################
if vpc_type:
slr_aes = aws_iam.CfnServiceLinkedRole(
self,
'AWSServiceRoleForAmazonElasticsearchService',
aws_service_name='es.amazonaws.com',
description='Created by cloudformation of aes-siem stack')
slr_aes.cfn_options.deletion_policy = core.CfnDeletionPolicy.RETAIN
######################################################################
# SQS for es-laoder's DLQ
######################################################################
sqs_aes_siem_dlq = aws_sqs.Queue(
self,
'AesSiemDlq',
queue_name='aes-siem-dlq',
retention_period=core.Duration.days(14))
######################################################################
# Setup Lambda
######################################################################
# setup lambda of es_loader
lambda_es_loader_vpc_kwargs = {}
if vpc_type:
lambda_es_loader_vpc_kwargs = {
'security_group': sg_vpc_noinbound_aes_siem,
'vpc': vpc_aes_siem,
'vpc_subnets': vpc_subnets,
}
lambda_es_loader = aws_lambda.Function(
self,
'LambdaEsLoader',
**lambda_es_loader_vpc_kwargs,
function_name='aes-siem-es-loader',
runtime=aws_lambda.Runtime.PYTHON_3_8,
# code=aws_lambda.Code.asset('../lambda/es_loader.zip'),
code=aws_lambda.Code.asset('../lambda/es_loader'),
handler='index.lambda_handler',
memory_size=512,
timeout=core.Duration.seconds(600),
dead_letter_queue_enabled=True,
dead_letter_queue=sqs_aes_siem_dlq,
environment={'GEOIP_BUCKET': s3bucket_name_geo})
es_loader_newver = lambda_es_loader.add_version(
name=__version__, description=__version__)
es_loader_opt = es_loader_newver.node.default_child.cfn_options
es_loader_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
# send only
# sqs_aes_siem_dlq.grant(lambda_es_loader, 'sqs:SendMessage')
# send and reieve. but it must be loop
sqs_aes_siem_dlq.grant(lambda_es_loader, 'sqs:SendMessage',
'sqs:ReceiveMessage', 'sqs:DeleteMessage',
'sqs:GetQueueAttributes')
lambda_geo = aws_lambda.Function(
self,
'LambdaGeoipDownloader',
function_name='aes-siem-geoip-downloader',
runtime=aws_lambda.Runtime.PYTHON_3_8,
code=aws_lambda.Code.asset('../lambda/geoip_downloader'),
handler='index.lambda_handler',
memory_size=320,
timeout=core.Duration.seconds(300),
environment={
's3bucket_name': s3bucket_name_geo,
'license_key': geoip_license_key.value_as_string,
})
lambda_geo_newver = lambda_geo.add_version(name=__version__,
description=__version__)
lamba_geo_opt = lambda_geo_newver.node.default_child.cfn_options
lamba_geo_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
######################################################################
# setup elasticsearch
######################################################################
lambda_deploy_es = aws_lambda.Function(
self,
'LambdaDeployAES',
function_name='aes-siem-deploy-aes',
runtime=aws_lambda.Runtime.PYTHON_3_8,
# code=aws_lambda.Code.asset('../lambda/deploy_es.zip'),
code=aws_lambda.Code.asset('../lambda/deploy_es'),
handler='index.aes_domain_handler',
memory_size=128,
timeout=core.Duration.seconds(720),
environment={
'accountid': core.Aws.ACCOUNT_ID,
'aes_domain_name': aes_domain_name,
'aes_admin_role': aes_siem_deploy_role_for_lambda.role_arn,
'es_loader_role': lambda_es_loader.role.role_arn,
'allow_source_address': allow_source_address.value_as_string,
},
role=aes_siem_deploy_role_for_lambda,
)
if vpc_type:
lambda_deploy_es.add_environment('vpc_subnet_id',
subnet1.subnet_id)
lambda_deploy_es.add_environment('security_group_id',
sg_vpc_aes_siem.security_group_id)
else:
lambda_deploy_es.add_environment('vpc_subnet_id', 'None')
lambda_deploy_es.add_environment('security_group_id', 'None')
deploy_es_newver = lambda_deploy_es.add_version(
name=__version__, description=__version__)
deploy_es_opt = deploy_es_newver.node.default_child.cfn_options
deploy_es_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
# execute lambda_deploy_es to deploy Amaozon ES Domain
aes_domain = aws_cloudformation.CfnCustomResource(
self,
'AesSiemDomainDeployedR2',
service_token=lambda_deploy_es.function_arn,
)
aes_domain.add_override('Properties.ConfigVersion', __version__)
aes_domain.cfn_options.deletion_policy = core.CfnDeletionPolicy.RETAIN
es_endpoint = aes_domain.get_att('es_endpoint').to_string()
lambda_es_loader.add_environment('ES_ENDPOINT', es_endpoint)
lambda_configure_es_vpc_kwargs = {}
if vpc_type:
lambda_configure_es_vpc_kwargs = {
'security_group': sg_vpc_noinbound_aes_siem,
'vpc': vpc_aes_siem,
'vpc_subnets': aws_ec2.SubnetSelection(subnets=[
subnet1,
]),
}
lambda_configure_es = aws_lambda.Function(
self,
'LambdaConfigureAES',
**lambda_configure_es_vpc_kwargs,
function_name='aes-siem-configure-aes',
runtime=aws_lambda.Runtime.PYTHON_3_8,
code=aws_lambda.Code.asset('../lambda/deploy_es'),
handler='index.aes_config_handler',
memory_size=128,
timeout=core.Duration.seconds(300),
environment={
'accountid': core.Aws.ACCOUNT_ID,
'aes_domain_name': aes_domain_name,
'aes_admin_role': aes_siem_deploy_role_for_lambda.role_arn,
'es_loader_role': lambda_es_loader.role.role_arn,
'allow_source_address': allow_source_address.value_as_string,
'es_endpoint': es_endpoint,
},
role=aes_siem_deploy_role_for_lambda,
)
if vpc_type:
lambda_configure_es.add_environment('vpc_subnet_id',
subnet1.subnet_id)
lambda_configure_es.add_environment(
'security_group_id', sg_vpc_aes_siem.security_group_id)
else:
lambda_configure_es.add_environment('vpc_subnet_id', 'None')
lambda_configure_es.add_environment('security_group_id', 'None')
configure_es_newver = lambda_configure_es.add_version(
name=__version__, description=__version__)
configure_es_opt = configure_es_newver.node.default_child.cfn_options
configure_es_opt.deletion_policy = core.CfnDeletionPolicy.RETAIN
aes_config = aws_cloudformation.CfnCustomResource(
self,
'AesSiemDomainConfiguredR2',
service_token=lambda_configure_es.function_arn,
)
aes_config.add_override('Properties.ConfigVersion', __version__)
aes_config.add_depends_on(aes_domain)
aes_config.cfn_options.deletion_policy = core.CfnDeletionPolicy.RETAIN
es_arn = (f'arn:aws:es:{core.Aws.REGION}:{core.Aws.ACCOUNT_ID}'
f':domain/{aes_domain_name}')
# grant permission to es_loader role
lambda_es_loader.role.attach_inline_policy(
aws_iam.Policy(self,
'aes-siem-policy-to-load-entries-to-es',
policy_name='aes-siem-policy-to-load-entries-to-es',
statements=[
aws_iam.PolicyStatement(actions=['es:*'],
resources=[
es_arn + '/*',
]),
]))
# grant additional permission to es_loader role
additional_kms_cmks = self.node.try_get_context('additional_kms_cmks')
if additional_kms_cmks:
lambda_es_loader.role.attach_inline_policy(
aws_iam.Policy(self,
'access_to_additional_cmks',
policy_name='access_to_additional_cmks',
statements=[
aws_iam.PolicyStatement(
actions=['kms:Decrypt'],
resources=sorted(
set(additional_kms_cmks)))
]))
additional_buckets = self.node.try_get_context('additional_s3_buckets')
if additional_buckets:
buckets_list = []
for bucket in additional_buckets:
buckets_list.append(f'arn:aws:s3:::{bucket}')
buckets_list.append(f'arn:aws:s3:::{bucket}/*')
lambda_es_loader.role.attach_inline_policy(
aws_iam.Policy(self,
'access_to_additional_buckets',
policy_name='access_to_additional_buckets',
statements=[
aws_iam.PolicyStatement(
actions=[
's3:GetObject*', 's3:GetBucket*',
's3:List*'
],
resources=sorted(set(buckets_list)))
]))
kms_aes_siem.grant_decrypt(lambda_es_loader)
######################################################################
# s3 notification and grant permisssion
######################################################################
s3_geo.grant_read_write(lambda_geo)
s3_geo.grant_read(lambda_es_loader)
s3_log.grant_read(lambda_es_loader)
# create s3 notification for es_loader
notification = aws_s3_notifications.LambdaDestination(lambda_es_loader)
# assign notification for the s3 PUT event type
# most log system use PUT, but also CLB use POST & Multipart Upload
s3_log.add_event_notification(
aws_s3.EventType.OBJECT_CREATED, notification,
aws_s3.NotificationKeyFilter(prefix='AWSLogs/'))
# For user logs, not AWS logs
s3_log.add_event_notification(
aws_s3.EventType.OBJECT_CREATED, notification,
aws_s3.NotificationKeyFilter(prefix='UserLogs/'))
# Download geoip to S3 once by executing lambda_geo
get_geodb = aws_cloudformation.CfnCustomResource(
self,
'ExecLambdaGeoipDownloader',
service_token=lambda_geo.function_arn,
)
get_geodb.cfn_options.deletion_policy = core.CfnDeletionPolicy.RETAIN
# Download geoip every day at 6PM UTC
rule = aws_events.Rule(
self,
'CwlRuleLambdaGeoipDownloaderDilly',
schedule=aws_events.Schedule.cron(minute='20',
hour='0',
month='*',
week_day='*',
year='*'),
)
rule.add_target(aws_events_targets.LambdaFunction(lambda_geo))
######################################################################
# bucket policy
######################################################################
s3_awspath = s3_log.bucket_arn + '/AWSLogs/' + core.Aws.ACCOUNT_ID
bucket_policy_common1 = aws_iam.PolicyStatement(
sid='ELB Policy',
principals=[
aws_iam.AccountPrincipal(account_id=elb_accounts.find_in_map(
core.Aws.REGION, 'accountid'))
],
actions=['s3:PutObject'],
resources=[s3_awspath + '/*'],
)
# NLB / ALB / R53resolver / VPC Flow Logs
bucket_policy_elb1 = aws_iam.PolicyStatement(
sid='AWSLogDeliveryAclCheck For ALB NLB R53Resolver Flowlogs',
principals=[
aws_iam.ServicePrincipal('delivery.logs.amazonaws.com')
],
actions=['s3:GetBucketAcl', 's3:ListBucket'],
resources=[s3_log.bucket_arn],
)
bucket_policy_elb2 = aws_iam.PolicyStatement(
sid='AWSLogDeliveryWrite For ALB NLB R53Resolver Flowlogs',
principals=[
aws_iam.ServicePrincipal('delivery.logs.amazonaws.com')
],
actions=['s3:PutObject'],
resources=[s3_awspath + '/*'],
conditions={
'StringEquals': {
's3:x-amz-acl': 'bucket-owner-full-control'
}
})
s3_log.add_to_resource_policy(bucket_policy_common1)
s3_log.add_to_resource_policy(bucket_policy_elb1)
s3_log.add_to_resource_policy(bucket_policy_elb2)
# CloudTrail
bucket_policy_trail1 = aws_iam.PolicyStatement(
sid='AWSLogDeliveryAclCheck For Cloudtrail',
principals=[aws_iam.ServicePrincipal('cloudtrail.amazonaws.com')],
actions=['s3:GetBucketAcl'],
resources=[s3_log.bucket_arn],
)
bucket_policy_trail2 = aws_iam.PolicyStatement(
sid='AWSLogDeliveryWrite For CloudTrail',
principals=[aws_iam.ServicePrincipal('cloudtrail.amazonaws.com')],
actions=['s3:PutObject'],
resources=[s3_awspath + '/*'],
conditions={
'StringEquals': {
's3:x-amz-acl': 'bucket-owner-full-control'
}
})
s3_log.add_to_resource_policy(bucket_policy_trail1)
s3_log.add_to_resource_policy(bucket_policy_trail2)
# GuardDuty
bucket_policy_gd1 = aws_iam.PolicyStatement(
sid='Allow GuardDuty to use the getBucketLocation operation',
principals=[aws_iam.ServicePrincipal('guardduty.amazonaws.com')],
actions=['s3:GetBucketLocation'],
resources=[s3_log.bucket_arn],
)
bucket_policy_gd2 = aws_iam.PolicyStatement(
sid='Allow GuardDuty to upload objects to the bucket',
principals=[aws_iam.ServicePrincipal('guardduty.amazonaws.com')],
actions=['s3:PutObject'],
resources=[s3_log.bucket_arn + '/*'],
)
bucket_policy_gd5 = aws_iam.PolicyStatement(
sid='Deny non-HTTPS access',
effect=aws_iam.Effect.DENY,
actions=['s3:*'],
resources=[s3_log.bucket_arn + '/*'],
conditions={'Bool': {
'aws:SecureTransport': 'false'
}})
bucket_policy_gd5.add_any_principal()
s3_log.add_to_resource_policy(bucket_policy_gd1)
s3_log.add_to_resource_policy(bucket_policy_gd2)
s3_log.add_to_resource_policy(bucket_policy_gd5)
# Config
bucket_policy_config1 = aws_iam.PolicyStatement(
sid='AWSConfig BucketPermissionsCheck and BucketExistenceCheck',
principals=[aws_iam.ServicePrincipal('config.amazonaws.com')],
actions=['s3:GetBucketAcl', 's3:ListBucket'],
resources=[s3_log.bucket_arn],
)
bucket_policy_config2 = aws_iam.PolicyStatement(
sid='AWSConfigBucketDelivery',
principals=[aws_iam.ServicePrincipal('config.amazonaws.com')],
actions=['s3:PutObject'],
resources=[s3_awspath + '/Config/*'],
conditions={
'StringEquals': {
's3:x-amz-acl': 'bucket-owner-full-control'
}
})
s3_log.add_to_resource_policy(bucket_policy_config1)
s3_log.add_to_resource_policy(bucket_policy_config2)
# geoip
bucket_policy_geo1 = aws_iam.PolicyStatement(
sid='Allow geoip downloader and es-loader to read/write',
principals=[lambda_es_loader.role, lambda_geo.role],
actions=['s3:PutObject', 's3:GetObject', 's3:DeleteObject'],
resources=[s3_geo.bucket_arn + '/*'],
)
s3_geo.add_to_resource_policy(bucket_policy_geo1)
# ES Snapshot
bucket_policy_snapshot = aws_iam.PolicyStatement(
sid='Allow ES to store snapshot',
principals=[aes_siem_snapshot_role],
actions=['s3:PutObject', 's3:GetObject', 's3:DeleteObject'],
resources=[s3_snapshot.bucket_arn + '/*'],
)
s3_snapshot.add_to_resource_policy(bucket_policy_snapshot)
######################################################################
# for multiaccount / organizaitons
######################################################################
if org_id or no_org_ids:
##################################################################
# KMS key policy for multiaccount / organizaitons
##################################################################
# for CloudTrail
cond_tail2 = self.make_resource_list(
path='arn:aws:cloudtrail:*:',
tail=':trail/*',
keys=[org_mgmt_id, no_org_ids])
key_policy_mul_trail2 = aws_iam.PolicyStatement(
sid=('Allow CloudTrail to encrypt logs for multiaccounts'),
actions=['kms:GenerateDataKey*'],
principals=[
aws_iam.ServicePrincipal('cloudtrail.amazonaws.com')
],
resources=['*'],
conditions={
'StringLike': {
'kms:EncryptionContext:aws:cloudtrail:arn': cond_tail2
}
})
kms_aes_siem.add_to_resource_policy(key_policy_mul_trail2)
# for replicaiton
key_policy_rep1 = aws_iam.PolicyStatement(
sid=('Enable cross account encrypt access for S3 Cross Region '
'Replication'),
actions=['kms:Encrypt'],
principals=self.make_account_plincipals(
org_mgmt_id, org_member_ids, no_org_ids),
resources=['*'],
)
kms_aes_siem.add_to_resource_policy(key_policy_rep1)
##################################################################
# Buckdet Policy for multiaccount / organizaitons
##################################################################
s3_log_bucket_arn = 'arn:aws:s3:::' + s3bucket_name_log
# for CloudTrail
s3_mulpaths = self.make_resource_list(
path=f'{s3_log_bucket_arn}/AWSLogs/',
tail='/*',
keys=[org_id, org_mgmt_id, no_org_ids])
bucket_policy_org_trail = aws_iam.PolicyStatement(
sid='AWSCloudTrailWrite for Multiaccounts / Organizations',
principals=[
aws_iam.ServicePrincipal('cloudtrail.amazonaws.com')
],
actions=['s3:PutObject'],
resources=s3_mulpaths,
conditions={
'StringEquals': {
's3:x-amz-acl': 'bucket-owner-full-control'
}
})
s3_log.add_to_resource_policy(bucket_policy_org_trail)
# config
s3_conf_multpaths = self.make_resource_list(
path=f'{s3_log_bucket_arn}/AWSLogs/',
tail='/Config/*',
keys=[org_id, org_mgmt_id, no_org_ids])
bucket_policy_mul_config2 = aws_iam.PolicyStatement(
sid='AWSConfigBucketDelivery',
principals=[aws_iam.ServicePrincipal('config.amazonaws.com')],
actions=['s3:PutObject'],
resources=s3_conf_multpaths,
conditions={
'StringEquals': {
's3:x-amz-acl': 'bucket-owner-full-control'
}
})
s3_log.add_to_resource_policy(bucket_policy_mul_config2)
# for replication
bucket_policy_rep1 = aws_iam.PolicyStatement(
sid='PolicyForDestinationBucket / Permissions on objects',
principals=self.make_account_plincipals(
org_mgmt_id, org_member_ids, no_org_ids),
actions=[
's3:ReplicateDelete', 's3:ReplicateObject',
's3:ReplicateTags', 's3:GetObjectVersionTagging',
's3:ObjectOwnerOverrideToBucketOwner'
],
resources=[f'{s3_log_bucket_arn}/*'])
bucket_policy_rep2 = aws_iam.PolicyStatement(
sid='PolicyForDestinationBucket / Permissions on bucket',
principals=self.make_account_plincipals(
org_mgmt_id, org_member_ids, no_org_ids),
actions=[
's3:List*', 's3:GetBucketVersioning',
's3:PutBucketVersioning'
],
resources=[f'{s3_log_bucket_arn}'])
s3_log.add_to_resource_policy(bucket_policy_rep1)
s3_log.add_to_resource_policy(bucket_policy_rep2)
######################################################################
# SNS topic for Amazon ES Alert
######################################################################
sns_topic = aws_sns.Topic(self,
'SnsTopic',
topic_name='aes-siem-alert',
display_name='AES SIEM')
sns_topic.add_subscription(
aws_sns_subscriptions.EmailSubscription(
email_address=sns_email.value_as_string))
sns_topic.grant_publish(aes_siem_sns_role)
######################################################################
# output of CFn
######################################################################
kibanaurl = f'https://{es_endpoint}/_plugin/kibana/'
kibanaadmin = aes_domain.get_att('kibanaadmin').to_string()
kibanapass = aes_domain.get_att('kibanapass').to_string()
core.CfnOutput(self,
'RoleDeploy',
export_name='role-deploy',
value=aes_siem_deploy_role_for_lambda.role_arn)
core.CfnOutput(self,
'KibanaUrl',
export_name='kibana-url',
value=kibanaurl)
core.CfnOutput(self,
'KibanaPassword',
export_name='kibana-pass',
value=kibanapass,
description='Please change the password in Kibana ASAP')
core.CfnOutput(self,
'KibanaAdmin',
export_name='kibana-admin',
value=kibanaadmin)