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Copy pathvpc-v2.cfndsl.rb
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vpc-v2.cfndsl.rb
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require 'ipaddr'
CloudFormation do
export = external_parameters.fetch(:export_name, external_parameters[:component_name])
tags = external_parameters.fetch(:tags, {})
custom_routes = external_parameters.fetch(:custom_routes, {})
vpc_tags, route_tables = Array.new(2) { [] }
vpc_tags.push({ Key: 'Name', Value: FnSub("${EnvironmentName}-vpc") })
vpc_tags.push({ Key: 'Environment', Value: Ref(:EnvironmentName) })
vpc_tags.push({ Key: 'EnvironmentType', Value: Ref(:EnvironmentType) })
vpc_tags.push(*tags.map {|k,v| {Key: FnSub(k), Value: FnSub(v)}})
###
# VPC
###
net = IPAddr.new(external_parameters[:vpc_cidr])
vpc_mask = external_parameters[:vpc_cidr].split('/').last.to_i
subnet_mask = external_parameters[:subnet_mask].to_i
if vpc_mask < 16 || vpc_mask > 28
raise ArgumentError, "The VPC CIDR block size must be from /16 to /28"
end
if subnet_mask < vpc_mask
raise ArgumentError, "The Subnet CIDR block size must larger than the VPC CIDR block size"
end
if subnet_mask < 16 || subnet_mask > 28
raise ArgumentError, "The Subnet CIDR block size must be from /16 to /28"
end
EC2_VPC(:VPC) {
CidrBlock Ref('CIDR')
EnableDnsSupport true
EnableDnsHostnames true
Tags vpc_tags
}
Output(:VPCId) {
Value(Ref(:VPC))
Export FnSub("${EnvironmentName}-#{export}-VPCId")
}
Output(:VPCCidr) {
Value(FnGetAtt(:VPC, :CidrBlock))
Export FnSub("${EnvironmentName}-#{export}-VPCCidr")
}
Output(:DefaultSecurityGroup) {
Value(FnGetAtt(:VPC, :DefaultSecurityGroup))
Export FnSub("${EnvironmentName}-#{export}-DefaultSecurityGroup")
}
if external_parameters[:enable_dhcp]
EC2_DHCPOptions(:DHCPOptionSet) {
DomainName FnSub(external_parameters[:dns_format])
DomainNameServers ['AmazonProvidedDNS']
Tags vpc_tags
}
EC2_VPCDHCPOptionsAssociation(:DHCPOptionsAssociation) {
VpcId Ref(:VPC)
DhcpOptionsId Ref(:DHCPOptionSet)
}
end
if external_parameters[:enable_internet_gateway]
EC2_InternetGateway(:InternetGateway) {
Tags vpc_tags
}
EC2_VPCGatewayAttachment(:AttachGateway){
VpcId Ref(:VPC)
InternetGatewayId Ref(:InternetGateway)
}
end
EC2_RouteTable(:RouteTablePublic) {
VpcId Ref(:VPC)
Tags [{Key: 'Name', Value: FnSub("${EnvironmentName}-public") }].push(*vpc_tags).uniq! { |t| t[:Key] }
}
Output(:PublicRouteTableIds) {
Value(Ref(:RouteTablePublic))
Export FnSub("${EnvironmentName}-#{export}-PublicRouteTableIds")
}
EC2_NetworkAcl(:NetworkAclPublic) {
VpcId Ref(:VPC)
Tags [{Key: 'Name', Value: FnSub("${EnvironmentName}-public") }].push(*vpc_tags).uniq! { |t| t[:Key] }
}
EC2_NetworkAcl(:NetworkAclPrivate) {
VpcId Ref(:VPC)
Tags [{Key: 'Name', Value: FnSub("${EnvironmentName}-private") }].push(*vpc_tags).uniq! { |t| t[:Key] }
}
if external_parameters[:enable_internet_gateway]
EC2_Route(:PublicRouteOutToInternet) {
DependsOn ['AttachGateway']
RouteTableId Ref(:RouteTablePublic)
DestinationCidrBlock '0.0.0.0/0'
GatewayId Ref(:InternetGateway)
}
end
##
# Custom routes
##
if custom_routes.length > 0
custom_routes.each_with_index do |(key,value),index|
if value.is_a?(String)
routeType = value.split('-').first
routeValue = value
else
routeType = value['type']
routeValue = value['value']
end
EC2_Route("CustomRoutePublic#{index}") {
DependsOn ['AttachGateway']
RouteTableId Ref(:RouteTablePublic)
DestinationCidrBlock key
case routeType
when "tgw"
TransitGatewayId routeValue
when "eigw"
EgressOnlyInternetGatewayId routeValue
when "vpce"
VpcEndpointId routeValue
when "vgw"
GatewayId routeValue
when "igw"
GatewayId routeValue
when "nat"
NatGatewayId routeValue
when "i"
InstanceId routeValue
when "eni"
NetworkInterfaceId routeValue
when "pcx"
VpcPeeringConnectionId routeValue
when "lgw"
LocalGatewayId routeValue
end
}
end
end
###
# Network Access Control Lists
###
external_parameters[:acl_rules].each do |rule|
cidrs = []
if rule.has_key?('ips')
cidrs.push(*rule['ips'].map {|ip| is_cidr?(ip) ? ip : ip_lookup(ip,external_parameters[:ip_blocks]) }.flatten(1))
elsif rule.has_key?('cidr')
cidrs.push(rule['cidr'])
else
cidrs.push('0.0.0.0/0')
end
cidrs.each_with_index do |cidr,index|
rule_number = rule['number'] + index
direction = (rule.has_key?('egress') && rule['egress']) ? 'Outbound' : 'Inbound'
EC2_NetworkAclEntry("NaclRule#{direction}#{rule['acl'].capitalize}#{rule_number}") {
NetworkAclId Ref("NetworkAcl#{rule['acl'].capitalize}")
RuleNumber rule_number
Protocol rule['protocol'] || '6'
RuleAction rule['action'] || 'allow'
Egress rule['egress'] || false
CidrBlock cidr
unless rule.has_key?('protocol') && ((rule['protocol'].to_s == '-1' || rule['protocol'].to_s == '1'))
PortRange ({ From: rule['from'], To: rule['to'] || rule['from'] })
end
if rule.has_key?('icmp')
Icmp({
'Type' => 3, # Destination Unreachable
'Code' => 4 # Fragmentation Needed
})
end
}
end
end
##
# NAT Resource and conditions
##
Condition(:CreateNatGatewayEIP, FnAnd([FnEquals(FnJoin("", Ref(:NatGatewayEIPs)), ""),FnNot(Condition(:NatDisabled))]))
Condition(:SpotEnabled, FnEquals(Ref(:NatInstancesSpot), 'true'))
Condition(:ManagedNat, FnEquals(Ref(:NatType), 'managed'))
Condition(:NatInstance, FnEquals(Ref(:NatType), 'instances'))
Condition(:NatDisabled, FnEquals(Ref(:NatType), 'disabled'))
EC2_SecurityGroup(:NatInstanceSecurityGroup) {
Condition(:NatInstance)
VpcId Ref(:VPC)
GroupDescription FnSub("${EnvironmentName} NAT Instances")
SecurityGroupIngress([
{
CidrIp: FnGetAtt(:VPC, :CidrBlock),
Description: "inbound all for ports from vpc cidr",
IpProtocol: -1,
}
])
SecurityGroupEgress([
{
CidrIp: "0.0.0.0/0",
Description: "outbound all for ports",
IpProtocol: -1,
}
])
Tags vpc_tags
}
IAM_Role(:NatInstanceRole) {
Condition(:NatInstance)
AssumeRolePolicyDocument service_assume_role_policy('ec2')
Path '/'
Policies iam_role_policies(external_parameters[:nat_iam_policies])
ManagedPolicyArns([
"arn:aws:iam::aws:policy/AmazonSSMManagedInstanceCore"
])
}
IAM_InstanceProfile(:NatInstanceProfile) {
Condition(:NatInstance)
Path '/'
Roles [Ref(:NatInstanceRole)]
}
external_parameters[:max_availability_zones].times do |az|
if az_mapping == true
get_az = {
AZ: FnSelect(
FnSelect(az,
FnSplit(',',
FnFindInMap('Accounts', Ref('AWS::AccountId'), 'AZs')
)
),
FnGetAZs(Ref('AWS::Region'))
)
}
else
get_az = { AZ: FnSelect(az, FnGetAZs(Ref('AWS::Region'))) }
end
matches = ((az+1)..external_parameters[:max_availability_zones]).to_a
# Determins whether we create resources in a particular availability zone
Condition("CreateAvailabilityZone#{az}",
if matches.length == 1
FnEquals(Ref(:AvailabilityZones), external_parameters[:max_availability_zones])
else
FnOr(matches.map { |i| FnEquals(Ref(:AvailabilityZones), i) })
end
)
# Determins whether we create a Manage Nat Gateway for this availability zone
Condition("CreateManagedNat#{az}",
if matches.length == 1
FnAnd([
Condition("CreateAvailabilityZone#{az}"),
Condition(:ManagedNat),
FnEquals(Ref(:NatGateways), external_parameters[:max_availability_zones])
])
else
FnAnd([
Condition("CreateAvailabilityZone#{az}"),
Condition(:ManagedNat),
FnOr(matches.map { |i| FnEquals(Ref(:NatGateways), i) })
])
end
)
# Determins whether we create a Nat EC2 Inatnce for this availability zone
Condition("CreateNatInstance#{az}",
if matches.length == 1
FnAnd([
Condition("CreateAvailabilityZone#{az}"),
Condition(:NatInstance),
FnEquals(Ref(:NatGateways), external_parameters[:max_availability_zones])
])
else
FnAnd([
Condition("CreateAvailabilityZone#{az}"),
Condition(:NatInstance),
FnOr(matches.map { |i| FnEquals(Ref(:NatGateways), i) })
])
end
)
# Determins whether we create a default public route through the manage NAT Gateway for this availability zone
Condition("CreateManagedNatRoute#{az}",
FnAnd([
Condition("CreateAvailabilityZone#{az}"),
Condition(:ManagedNat)
])
)
# Determins whether we create a default public route through the NAT EC2 Instance for this availability zone
Condition("CreateNatInstanceRoute#{az}",
FnAnd([
Condition("CreateAvailabilityZone#{az}"),
Condition(:NatInstance)
])
)
# Determins whether we create a Elastic Public IP for this availability zone
# This works across both managed nat and nat instances
# We always want a EIP created even when disabled selected to allow transition between managed and instance with out loosing the IP
Condition("CreateNatGatewayEIP#{az}",
if matches.length == 1
FnAnd([
Condition("CreateAvailabilityZone#{az}"),
Condition('CreateNatGatewayEIP'),
FnEquals(Ref(:NatGateways), external_parameters[:max_availability_zones])
])
else
FnAnd([
Condition("CreateAvailabilityZone#{az}"),
Condition('CreateNatGatewayEIP'),
FnOr(matches.map { |i| FnEquals(Ref(:NatGateways), i) })
])
end
)
EC2_RouteTable("RouteTablePrivate#{az}") {
VpcId Ref(:VPC)
Tags [{Key: 'Name', Value: FnSub("${EnvironmentName}-private-${AZ}", get_az) }].push(*vpc_tags).uniq! { |t| t[:Key] }
}
route_tables.push(Ref("RouteTablePrivate#{az}"))
EC2_EIP("NatIPAddress#{az}") {
Condition "CreateNatGatewayEIP#{az}"
if external_parameters[:enable_internet_gateway]
DependsOn ["AttachGateway"]
end
Domain 'vpc'
Tags [{Key: 'Name', Value: FnSub("${EnvironmentName}-nat-${AZ}", get_az) }].push(*vpc_tags).uniq! { |t| t[:Key] }
}
##
# Managed Nat Gateway
##
EC2_NatGateway("NatGateway#{az}") {
Condition("CreateManagedNat#{az}")
AllocationId FnIf(:CreateNatGatewayEIP,
FnGetAtt("NatIPAddress#{az}", :AllocationId),
FnSelect(az, Ref(:NatGatewayEIPs)))
SubnetId Ref("SubnetPublic#{az}")
Tags [{Key: 'Name', Value: FnSub("${EnvironmentName}-natgw-${AZ}", get_az) }].push(*vpc_tags).uniq! { |t| t[:Key] }
}
EC2_Route("RouteOutToInternet#{az}") {
Condition("CreateManagedNatRoute#{az}")
RouteTableId Ref("RouteTablePrivate#{az}")
DestinationCidrBlock '0.0.0.0/0'
NatGatewayId FnIf("CreateManagedNat#{az}",
Ref("NatGateway#{az}"),
Ref("NatGateway0")) # defaults to nat 0 if no nat in that az
}
##
# Custom routes
##
if custom_routes.length > 0
custom_routes.each_with_index do |(key,value),index|
if value.is_a?(String)
routeType = value.split('-').first
routeValue = value
else
routeType = value['type']
routeValue = value['value']
end
EC2_Route("CustomRoute#{az}#{index}") {
RouteTableId Ref("RouteTablePrivate#{az}")
DestinationCidrBlock key
case routeType
when "tgw"
TransitGatewayId routeValue
when "eigw"
EgressOnlyInternetGatewayId routeValue
when "vpce"
VpcEndpointId routeValue
when "vgw"
GatewayId routeValue
when "igw"
GatewayId routeValue
when "nat"
NatGatewayId routeValue
when "i"
InstanceId routeValue
when "eni"
NetworkInterfaceId routeValue
when "pcx"
VpcPeeringConnectionId routeValue
when "lgw"
LocalGatewayId routeValue
end
}
end
end
##
# Nat Gateway Instances
##
nat_tags = vpc_tags.map(&:clone)
nat_tags.push({ Key: 'Name', Value: FnSub("${EnvironmentName}-nat-${AZ}", get_az) })
nat_tags = nat_tags.reverse.uniq { |h| h[:Key] }
EC2_NetworkInterface("NetworkInterface#{az}") {
Condition("CreateNatInstance#{az}")
SubnetId Ref("SubnetPublic#{az}")
SourceDestCheck false
GroupSet [Ref(:NatInstanceSecurityGroup)]
Tags nat_tags
}
EC2_EIPAssociation("EIPAssociation#{az}") {
Condition("CreateNatInstance#{az}")
AllocationId FnIf(:CreateNatGatewayEIP,
FnGetAtt("NatIPAddress#{az}", :AllocationId),
FnSelect(az, Ref(:NatGatewayEIPs)))
NetworkInterfaceId Ref("NetworkInterface#{az}")
}
if external_parameters[:nat_2023]
nat_userdata = <<~USERDATA
#!/bin/bash
# Fetch the metadata token for IMDSv2
TOKEN=$(curl -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600")
INSTANCE_ID=$(curl -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/2014-11-05/meta-data/instance-id -s)
aws ec2 modify-network-interface-attribute --network-interface-id ${NetworkInterface#{az}} --no-source-dest-check --region ${AWS::Region}
/opt/aws/bin/cfn-init -v --stack ${AWS::StackName} --resource LaunchTemplate#{az} --region ${AWS::Region}
dnf -y install iptables iptables-utils iptables-services amazon-ssm-agent cronie
systemctl enable amazon-ssm-agent
systemctl start amazon-ssm-agent
sysctl -w net.ipv4.ip_forward=1
sysctl -w net.ipv4.conf.ens5.rp_filter=0
echo net.ipv4.ip_forward = 1 >> /etc/sysctl.conf
echo net.ipv4.conf.ens5.rp_filter = 0 >> /etc/sysctl.conf
iptables -t nat -A POSTROUTING -s ${CIDR} -o ens5 -j MASQUERADE
iptables -t mangle -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
iptables-save > /etc/sysconfig/iptables
echo "@reboot root aws ec2 modify-network-interface-attribute --network-interface-id ${NetworkInterface#{az}} --no-source-dest-check --region ${AWS::Region}" >> /etc/crontab
systemctl enable crond --now
systemctl enable iptables --now
USERDATA
else
nat_userdata = <<~USERDATA
#!/bin/bash
INSTANCE_ID=$(curl http://169.254.169.254/2014-11-05/meta-data/instance-id -s)
aws ec2 attach-network-interface --instance-id $INSTANCE_ID --network-interface-id ${NetworkInterface#{az}} --device-index 1 --region ${AWS::Region}
/opt/aws/bin/cfn-init -v --stack ${AWS::StackName} --resource LaunchTemplate#{az} --region ${AWS::Region}
systemctl disable postfix
systemctl stop postfix
systemctl enable snat
systemctl start snat
USERDATA
end
network_interfaces = {
DeviceIndex: 0,
AssociatePublicIpAddress: true,
Groups: [ Ref(:NatInstanceSecurityGroup) ]
}
if external_parameters[:nat_2023]
network_interfaces = {
NetworkInterfaceId: Ref("NetworkInterface#{az}"),
DeviceIndex: 0
}
end
template_data = {
TagSpecifications: [
{ ResourceType: 'instance', Tags: nat_tags },
{ ResourceType: 'volume', Tags: nat_tags }
],
ImageId: Ref(:NatAmi),
InstanceType: Ref(:NatInstanceType),
UserData: FnBase64(FnSub(nat_userdata)),
IamInstanceProfile: { Name: Ref(:NatInstanceProfile) },
NetworkInterfaces: [network_interfaces]
}
spot_options = {
MarketType: 'spot',
SpotOptions: {
SpotInstanceType: 'one-time',
}
}
template_data[:InstanceMarketOptions] = FnIf(:SpotEnabled, spot_options, Ref('AWS::NoValue'))
EC2_LaunchTemplate("LaunchTemplate#{az}") {
Condition("CreateNatInstance#{az}")
LaunchTemplateData(template_data)
Metadata({
'AWS::CloudFormation::Init': {
configSets: {
default: [
'setup'
]
},
setup: {
files: {
'/opt/snat.sh': {
mode: '000755',
owner: 'root',
group: 'root',
content: <<~CONTENT
#!/bin/bash -x
# wait for eth1
while ! ip link show dev eth1; do
sleep 1
done
# enable IP forwarding and NAT
sysctl -q -w net.ipv4.ip_forward=1
sysctl -q -w net.ipv4.conf.eth1.send_redirects=0
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
# switch the default route to eth1
ip route del default dev eth0
# wait for network connection
curl --retry 10 http://www.example.com
# reestablish connections
systemctl restart amazon-ssm-agent.service
CONTENT
},
'/etc/systemd/system/snat.service': {
mode: '000644',
owner: 'root',
group: 'root',
content: <<~CONTENT
[Unit]
Description = SNAT via ENI eth1
[Service]
ExecStart = /opt/snat.sh
Type = oneshot
[Install]
WantedBy = multi-user.target
CONTENT
}
}
}
}
})
}
asg_tags = nat_tags.map(&:clone)
AutoScaling_AutoScalingGroup("AutoScaleGroup#{az}") {
Condition("CreateNatInstance#{az}")
UpdatePolicy(:AutoScalingRollingUpdate, {
MaxBatchSize: '1',
MinInstancesInService: 0,
SuspendProcesses: %w(HealthCheck ReplaceUnhealthy AZRebalance AlarmNotification ScheduledActions)
})
UpdatePolicy(:AutoScalingScheduledAction, {
IgnoreUnmodifiedGroupSizeProperties: true
})
DesiredCapacity '1'
MinSize '1'
MaxSize '1'
AvailabilityZones [FnSelect(az, FnGetAZs(Ref('AWS::Region')))] if external_parameters[:nat_2023]
VPCZoneIdentifier [Ref("SubnetPublic#{az}")] unless external_parameters[:nat_2023]
LaunchTemplate({
LaunchTemplateId: Ref("LaunchTemplate#{az}"),
Version: FnGetAtt("LaunchTemplate#{az}", :LatestVersionNumber)
})
Tags asg_tags.each {|h| h[:PropagateAtLaunch]=false}
}
EC2_Route("RouteOutToInternet#{az}ViaNatInstance") {
Condition("CreateNatInstanceRoute#{az}")
RouteTableId Ref("RouteTablePrivate#{az}")
DestinationCidrBlock '0.0.0.0/0'
NetworkInterfaceId FnIf("CreateNatInstance#{az}",
Ref("NetworkInterface#{az}"),
Ref("NetworkInterface0")) # defaults to nat 0 if no nat in that az
}
end
Output(:PrivateRouteTableIds) {
Value(FnJoin(",",route_tables))
Export FnSub("${EnvironmentName}-#{export}-PrivateRouteTableIds")
}
##
# Subnets
##
subnet_groups = {}
external_parameters[:subnets].each_with_index do |(subnet,cfg),index|
next unless cfg['enable']
subnet_grp_refs = []
external_parameters[:max_availability_zones].times do |az|
multiplyer = az+index*external_parameters[:subnet_multiplyer]
subnet_name_az = "Subnet#{cfg['name']}#{az}"
if az_mapping == true
get_az = FnSelect(
FnSelect(az,
FnSplit(',',
FnFindInMap('Accounts', Ref('AWS::AccountId'), 'AZs')
)
),
FnGetAZs(Ref('AWS::Region'))
)
else
get_az = FnSelect(az, FnGetAZs(Ref('AWS::Region')))
end
if external_parameters[:subnet_parameters]
subnet_cidr = FnSelect(az, Ref("#{cfg['name']}SubnetList"))
else
subnet_cidr = FnSelect(multiplyer,FnCidr(Ref('CIDR'),(external_parameters[:subnet_multiplyer]*external_parameters[:subnets].length),Ref('SubnetBits')))
end
subnet_tags = vpc_tags.map(&:clone)
subnet_tags << { Key: 'Name', Value: FnSub("${EnvironmentName}-#{cfg['name'].downcase}-${AZ}", { AZ: get_az }) }
subnet_tags << { Key: 'Type', Value: cfg['type'] }
subnet_tags.push(*cfg['tags'].map{|t| t.transform_keys(&:to_sym) }) if cfg.key?('tags')
EC2_Subnet(subnet_name_az) {
Condition("CreateAvailabilityZone#{az}")
VpcId Ref(:VPC)
CidrBlock subnet_cidr
AvailabilityZone get_az
Tags subnet_tags.reverse.uniq {|t| t[:Key]}
}
subnet_grp_refs.push(Ref(subnet_name_az))
route_table = cfg['type'].downcase == 'public' ? 'RouteTablePublic' : "RouteTablePrivate#{az}"
EC2_SubnetRouteTableAssociation("RouteTableAssociation#{subnet_name_az}") {
Condition("CreateAvailabilityZone#{az}")
SubnetId Ref(subnet_name_az)
RouteTableId Ref(route_table)
}
EC2_SubnetNetworkAclAssociation("ACLAssociation#{subnet_name_az}") {
Condition("CreateAvailabilityZone#{az}")
SubnetId Ref(subnet_name_az)
NetworkAclId Ref("NetworkAcl#{cfg['type'].capitalize}")
}
end
subnet_grp_condition = ''
external_parameters[:max_availability_zones].times do |az|
subnet_grp_condition = FnIf("CreateAvailabilityZone#{az}", subnet_grp_refs[0..az], subnet_grp_condition)
end
Output("#{cfg['name']}Subnets") {
Value(FnJoin(',', subnet_grp_condition))
Export FnSub("${EnvironmentName}-#{export}-#{cfg['name']}Subnets")
}
subnet_groups[cfg['name']] = subnet_grp_condition
end
##
# VPC Endpoints
##
EC2_VPCEndpoint(:S3VpcEndpoint) {
VpcId Ref(:VPC)
PolicyDocument({
Version: "2012-10-17",
Statement: [{
Effect: "Allow",
Principal: "*",
Action: ["s3:*"],
Resource: ["arn:aws:s3:::*"]
}]
})
ServiceName FnSub("com.amazonaws.${AWS::Region}.s3")
RouteTableIds route_tables
}
Output(:S3VPCEndpointId) {
Value(Ref(:S3VpcEndpoint))
Export FnSub("${EnvironmentName}-#{export}-S3VPCEndpointId")
}
EC2_VPCEndpoint(:DynamodbVpcEndpoint) {
VpcId Ref(:VPC)
ServiceName FnSub("com.amazonaws.${AWS::Region}.dynamodb")
RouteTableIds route_tables
}
Output(:DynamodbVPCEndpointId) {
Value(Ref(:DynamodbVpcEndpoint))
Export FnSub("${EnvironmentName}-#{export}-DynamodbVPCEndpointId")
}
endpoints = external_parameters.fetch(:endpoints, [])
if endpoints.any?
EC2_SecurityGroup(:VpcEndpointInterface) {
VpcId Ref(:VPC)
GroupDescription FnSub("Access to Amazon service VPC Endpoints from within the ${EnvironmentName} VPC")
SecurityGroupIngress([
{
CidrIp: FnGetAtt(:VPC, :CidrBlock),
Description: FnSub("HTTPS from ${EnvironmentName} VPC"),
IpProtocol: 'tcp',
FromPort: '443',
ToPort: '443'
}
])
Metadata({
cfn_nag: {
rules_to_suppress: [
{ id: 'F1000', reason: 'adding rules using cfn resources' }
]
}
})
}
endpoints.each do |endpoint|
vpce = endpoint.gsub(/[^0-9a-z ]/i, '')
EC2_VPCEndpoint("#{vpce.capitalize}VpcEndpoint") {
VpcId Ref(:VPC)
ServiceName FnSub("com.amazonaws.${AWS::Region}.#{endpoint}")
VpcEndpointType "Interface"
PrivateDnsEnabled true
SubnetIds subnet_groups[external_parameters[:endpoint_subnets]]
SecurityGroupIds [ Ref(:VpcEndpointInterface) ]
}
Output("#{vpce.capitalize}VPCEndpointId") {
Value(Ref("#{vpce.capitalize}VpcEndpoint"))
Export FnSub("${EnvironmentName}-#{export}-#{vpce.capitalize}VPCEndpointId")
}
end
end
##
# Transit VPC
##
if external_parameters[:enable_transit_vpc]
Condition('DoEnableTransitVPC', FnEquals(Ref('EnableTransitVPC'),'true'))
transit_vpc_tags = [
{ Key: 'Name', Value: FnSub("${EnvironmentName}-VGW") },
{ Key: 'transitvpc:spoke', Value: Ref('EnableTransitVPC') }
]
VPNGateway(:VGW) {
Condition('DoEnableTransitVPC')
Type 'ipsec.1'
if external_parameters[:vgw_asn]
AmazonSideAsn external_parameters[:vgw_asn]
end
Tags transit_vpc_tags.push(*vpc_tags).uniq! { |t| t[:Key] }
}
VPCGatewayAttachment(:AttachVGWToVPC) {
Condition('DoEnableTransitVPC')
VpcId Ref(:VPC)
VpnGatewayId Ref(:VGW)
}
VPNGatewayRoutePropagation(:PropagateRoute) {
Condition('DoEnableTransitVPC')
DependsOn ['AttachVGWToVPC']
RouteTableIds route_tables
VpnGatewayId Ref(:VGW)
}
end
##
# VPC Flow logs
##
flowlogs = external_parameters.fetch(:flowlogs, false)
if flowlogs
log_retention = (flowlogs.is_a?(Hash) && flowlogs.has_key?('log_retention')) ? flowlogs['log_retention'] : 7
Logs_LogGroup(:FlowLogsLogGroup) {
LogGroupName FnSub("${EnvironmentName}-vpc-flowlogs")
RetentionInDays "#{log_retention}"
}
IAM_Role(:PutVPCFlowLogsRole) {
AssumeRolePolicyDocument service_role_assume_policy('vpc-flow-logs')
Path '/'
Policies ([
PolicyName: 'PutVPCFlowLogsRole',
PolicyDocument: {
Statement: [
{
Effect: 'Allow',
Action: [
"logs:CreateLogGroup",
"logs:CreateLogStream",
"logs:PutLogEvents",
"logs:DescribeLogGroups",
"logs:DescribeLogStreams"
],
Resource: '*'
}
]
}
])
}
EC2_FlowLog(:VPCFlowLogs) {
DeliverLogsPermissionArn FnGetAtt(:PutVPCFlowLogsRole, :Arn)
LogGroupName Ref(:FlowLogsLogGroup)
ResourceId Ref(:VPC)
ResourceType 'VPC'
TrafficType (flowlogs.is_a?(Hash) && flowlogs.has_key?('traffic_type')) ? flowlogs['traffic_type'] : 'ALL'
}
end
##
# Route 53
##
if !external_parameters[:manage_ns_records] && external_parameters[:create_hosted_zone]
Route53_HostedZone(:HostedZone) {
Name FnSub(external_parameters[:dns_format])
HostedZoneConfig ({
Comment: FnSub("Hosted Zone for ${EnvironmentName}")
})
HostedZoneTags [{Key: 'Name', Value: FnSub(external_parameters[:dns_format]) }].push(*vpc_tags).uniq! { |t| t[:Key] }
}
Output(:HostedZone) {
Value(Ref(:HostedZone))
Export FnSub("${EnvironmentName}-#{export}-hosted-zone")
}
end
end