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access-function.template
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access-function.template
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AWSTemplateFormatVersion: "2010-09-09"
Description: Creates a Lambda function that handles the tenant data access.
Parameters:
VpcID:
Type: AWS::EC2::VPC::Id
PrivateSubnet1:
Type: AWS::EC2::Subnet::Id
PrivateSubnet2:
Type: AWS::EC2::Subnet::Id
LambdaRuntimeEnv:
Type: String
LayerVersionArn:
Type: String
Endpoint:
Type: String
RDSSecurityGroup:
Type: AWS::EC2::SecurityGroup::Id
ProxySecurityGroup:
Type: String # Has to be type String as NoProxy has 'NA' value
CreateRDSProxy:
Type: String
DbClusterResourceId:
Type: String
Conditions:
IsPython: !Equals [!Ref LambdaRuntimeEnv, Python]
IsNodeJs: !Equals [!Ref LambdaRuntimeEnv, Nodejs]
IsRDSProxy: !Equals [!Ref CreateRDSProxy, true]
Transform: AWS::Serverless-2016-10-31
Resources:
PythonLambdaFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: ../src/functions/python
Description: Tenant data access function.
Environment:
Variables:
AWS_STS_REGIONAL_ENDPOINTS: regional
endpoint: !Ref Endpoint
cluster_endpoint_resource: !Sub arn:${AWS::Partition}:rds-db:${AWS::Region}:${AWS::AccountId}:dbuser:${DbClusterResourceId}/user
region: !Sub ${AWS::Region}
iam_arn: !GetAtt STSRole.Arn
FunctionName: !Sub fn-${AWS::StackName}
Handler: access.lambda_handler
Layers:
- !Ref LayerVersionArn
Role: !GetAtt LambdaAccessRole.Arn
Runtime: python3.8
Timeout: 60 #900
Tracing: Active
VpcConfig:
SecurityGroupIds:
- !Ref LamdaSecurityGroup
SubnetIds:
- !Ref PrivateSubnet1
- !Ref PrivateSubnet2
Condition: IsPython
NodeJsLambdaFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: ../src/functions/nodejs
Description: Tenant data access function.
Environment:
Variables:
AWS_STS_REGIONAL_ENDPOINTS: regional
endpoint: !Ref Endpoint
cluster_endpoint_resource: !Sub arn:${AWS::Partition}:rds-db:${AWS::Region}:${AWS::AccountId}:dbuser:${DbClusterResourceId}/user
region: !Sub ${AWS::Region}
iam_arn: !GetAtt STSRole.Arn
FunctionName: !Sub fn-${AWS::StackName}
Handler: index.handler
Layers:
- !Ref LayerVersionArn
Role: !GetAtt LambdaAccessRole.Arn
Runtime: nodejs12.x
Timeout: 60 #900
Tracing: Active
VpcConfig:
SecurityGroupIds:
- !Ref LamdaSecurityGroup
SubnetIds:
- !Ref PrivateSubnet1
- !Ref PrivateSubnet2
Condition: IsNodeJs
LamdaSecurityGroup:
Type: AWS::EC2::SecurityGroup
Properties:
GroupDescription: Lambda Security Group
SecurityGroupEgress:
- CidrIp: 0.0.0.0/0
Description: Allow all https outbound traffic
IpProtocol: tcp
FromPort: 443
ToPort: 443
- DestinationSecurityGroupId: !If
- IsRDSProxy
- !Ref ProxySecurityGroup
- !Ref RDSSecurityGroup
Description: Allow db outbound traffic
IpProtocol: tcp
FromPort: 3306
ToPort: 3306
VpcId: !Ref VpcID
LambdaToRDSIngress:
Type: AWS::EC2::SecurityGroupIngress
Properties:
IpProtocol: tcp
Description: Lambda to RDS ingress rule
FromPort: 3306
GroupId: !Ref RDSSecurityGroup
SourceSecurityGroupId: !Ref LamdaSecurityGroup
ToPort: 3306
LambdaToProxyIngress:
Type: AWS::EC2::SecurityGroupIngress
Properties:
IpProtocol: tcp
Description: Lambda to Proxy ingress rule
FromPort: 3306
GroupId: !Ref ProxySecurityGroup
SourceSecurityGroupId: !Ref LamdaSecurityGroup
ToPort: 3306
Condition: IsRDSProxy
LambdaAccessRole:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: Allow
Principal:
Service: lambda.amazonaws.com
Action: sts:AssumeRole
Policies:
- PolicyName: XraySeviceAccess
PolicyDocument:
Version: "2012-10-17"
Statement:
Effect: Allow
Action:
- xray:PutTraceSegments
- xray:PutTelemetryRecords
- xray:GetSamplingRules
- xray:GetSamplingTargets
- xray:GetSamplingStatisticSummaries
Resource: '*'
- PolicyName: CloudWatchLogsSeviceAccess
PolicyDocument:
Version: "2012-10-17"
Statement:
Effect: Allow
Action:
- logs:CreateLogGroup
- logs:CreateLogStream
- logs:PutLogEvents
Resource:
- !Sub arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:log-group:*
- !Sub arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:log-group:*:log-stream:*
- PolicyName: VPCSeviceAccess
PolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: Allow
Action:
- ec2:DescribeNetworkInterfaces
Resource: '*'
- Effect: Allow
Action:
- ec2:CreateNetworkInterface
- ec2:DeleteNetworkInterface
- ec2:AssignPrivateIpAddresses
- ec2:UnassignPrivateIpAddresses
Resource: '*'
STSRole:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: Allow
Principal:
AWS: !Sub arn:aws:sts::${AWS::AccountId}:assumed-role/${LambdaAccessRole}/fn-${AWS::StackName}
Action: sts:AssumeRole
Policies:
- PolicyName: StsPermissionsBoundary
PolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: Allow
Action: rds-db:connect
Resource: !Sub arn:aws:rds-db:${AWS::Region}:${AWS::AccountId}:dbuser:*
Outputs:
PythonLambdaFunction:
Value: !Ref PythonLambdaFunction
Condition: IsPython
NodeJsLambdaFunction:
Value: !Ref NodeJsLambdaFunction
Condition: IsNodeJs