I have a lambda function that needs to talk to few aws services like (EC2, other lambda functions, api gateway, Elastic Search service). all of these services are inside a private subnet in an exsiting vpc. How do i add a policy/role via cloudformation template such that i give access my lambda function to communicate with these other services. also , do i need to define a security group. right now there is a default security group applied to all of resources which doesn't have any inbound/outbound rules.
AWSTemplateFormatVersion: 2010-09-09
Parameters:
VPCId:
Type: AWS::EC2::VPC::Id
Resources:
# S3 Bucket
S3Bucket:
Type: AWS::S3::Bucket
# Functions
S3-Lambda-trigger:
Type: AWS::Serverless::Function
Properties:
CodeUri: .
Handler: lambda.handler
Description: s3 object creation triggers lambda
Runtime: nodejs12.x
Events:
S3Bucket:
Type: S3
Properties:
Bucket: !Ref S3Bucket
Events: 's3:ObjectCreated:*'
# Permissions
Allow-lamda-invocation-s3:
Type: AWS::Lambda::Permission
Properties:
Action: 'lambda:InvokeFunction'
FunctionName: !Ref S3-Lambda-trigger
Principal: s3.amazonaws.com
SourceArn: !GetAtt S3Bucket.Arn
Related
I am writing one cft to connect dynamodb uisng vpcEndpoint.
DynamoDBEndpoint:
Type: "AWS::EC2::VPCEndpoint"
Properties:
RouteTableIds:
- !Ref PublicRouteTable
- !Ref Private0RouteTable
- !Ref Private1RouteTable
- !Ref Private2RouteTable
ServiceName:
!Sub "com.amazonaws.${AWS::Region}.dynamodb"
VpcId: !Ref VPC
Parameters:
vpcId:
Description: Choose the existing one
Type: AWS::EC2::VPC::Id
I am getting existing vpcId by using parameter ,is there any way I can ruse my existing routetable ,Please suggest me on this how could I define this ref PublicRouteTable and ref PrivateRouteTable .
Your parameter vpcId works because it uses AWS::EC2::VPC::Id type which belongs to Supported AWS-specific parameter types in CloudFormation.
Sadly, CloudFormation does not support similar type for route tables. You have to type out route tables IDs manually in console when you specify parameters.
I'm trying to create or update a stack with the following CloudFormation Template:
AWSTemplateFormatVersion: '2010-09-09'
Parameters:
ApiGatewayId:
Type: String
ApiLayerArn:
Type: String
JarLocation:
Type: String
Resources:
Function:
Type: 'AWS::Lambda::Function'
Properties:
Handler: net.bitsandpaper.api.kiosk.PlatformChecker
Runtime: java11
Code:
S3Bucket: bnp-build-artifacts
S3Key: !Ref JarLocation
Description: ''
MemorySize: 128
Timeout: 5
Role: arn:aws:iam::479832603967:role/bnp-api-lambda-execution-role
Layers:
- !Ref ApiLayerArn
ApiIntegration:
Type: AWS::ApiGatewayV2::Integration
Properties:
ApiId: !Ref ApiGatewayId
IntegrationType: AWS_PROXY
IntegrationUri: !Join
- ''
- - 'arn:'
- !Ref 'AWS::Partition'
- ':apigateway:'
- !Ref 'AWS::Region'
- ':lambda:path/2015-03-31/functions/'
- !Ref Function
- /invocations
TimeoutInMillis: 6000
ApiRoute:
Type: AWS::ApiGatewayV2::Route
Properties:
ApiId: !Ref ApiGatewayId
RouteKey: 'GET /kiosk/platform-check'
Target: !Join
- /
- - integrations
- !Ref ApiIntegration
The parameters are correctly passed by an external file, they look good in the Web Console, notably parameter ApiGatewayId has value 8548rqrsm5. Yet during deployment I have a CREATE_FAILED for ApiIntegration, with the message:
Invalid API identifier specified 479832603967:8548rqrsm5 (Service:
AmazonApiGatewayV2; Status Code: 404; Error Code: NotFoundException;
Request ID: 84918a83-cf9d-48d2-acf7-18d9d2e4d330; Proxy: null)
The API is an EDGE Rest API, in the same region than the CloudFormation stack. The ID is retrieved by the CLI with aws apigateway get-rest-apis.
Am I missing something in the ApiId format? The litterature is very scarce when not referencing an API in the same stack...
AWS::ApiGatewayV2 is only for WEBSOCKTES and HTTP types. From docs:
The API protocol. Valid values are WEBSOCKET or HTTP.
But since you are writing about Edge-optimized (not supported by HTTP api) it seems to that you are using REST API, rather then HTTP API. So you should be using AWS::ApiGateway resources, not AWS::ApiGatewayV2.
It seem's like the AWS::ApiGatewayV2::Route is created before the AWS::ApiGatewayV2::Integration. So When it trying to refer ApiIntegration it is not yet created.
So you should try to use DependsOn attribute.
With the DependsOn attribute you can specify that the creation of a
specific resource follows another. When you add a DependsOn attribute
to a resource, that resource is created only after the creation of the
resource specified in the DependsOn attribute.
Try this below CloudFormation code:
ApiRoute:
Type: AWS::ApiGatewayV2::Route
DependsOn: ApiIntegration
Properties:
ApiId: !Ref ApiGatewayId
RouteKey: 'GET /kiosk/platform-check'
Target: !Join
- /
- - integrations
- !Ref ApiIntegration
I hope this will help you out to resolve your problem.
Link: DependsOn Attribute UserGuide
I've created the following CloudFormation template:
AWSTemplateFormatVersion: 2010-09-09
Description: Creates all resources necessary to send SES emails & track bounces/complaints through AWS
Resources:
IAMUser:
Type: 'AWS::IAM::User'
Properties:
UserName: iam-ses-sqs
SQSQueue:
Type: 'AWS::SQS::Queue'
Properties:
QueueName: ses-queue
SNSTopic:
Type: 'AWS::SNS::Topic'
Properties:
TopicName: sns-notifications
IAMUserPolicy:
Type: 'AWS::IAM::Policy'
Properties:
PolicyName: IAM_Send_SES_Email
PolicyDocument:
Statement:
- Effect: Allow
Action:
- 'SES:SendEmail'
- 'SES:SendRawEmail'
Resource: 'arn:aws:ses:*:*:identity/*'
Users:
- !Ref IAMUser
SQSQueuePolicy:
Type: 'AWS::SQS::QueuePolicy'
Properties:
Queues:
- !Ref SQSQueue
PolicyDocument:
Statement:
- Action:
- 'SQS:ReceiveMessage'
- 'SQS:DeleteMessage'
- 'SQS:GetQueueAttributes'
Effect: Allow
Resource: !Ref SQSQueue
Principal:
AWS:
- !Ref IAMUser
SNSTopicSubscription:
Type: 'AWS::SNS::Subscription'
Properties:
Protocol: SQS
Endpoint: !GetAtt
- SQSQueue
- Arn
TopicArn: !Ref SNSTopic
I'd like to allow IAMUser to perform the SQS ReceiveMessage, DeleteMessage, and GetQueueAttributes actions on the SQSQueue resource. SQSQueue should also be subscribed to the SNSTopic.
When creating a stack using this template in CloudFormation, the SQSQueue, SNSTopic, SNSTopicSubscription, IAMUser, and IAMUserPolicy all create with no problem, in that order. However, the SQSQueuePolicy fails to create and generates the error message:
Invalid value for the parameter Policy. (Service: AmazonSQS; Status Code: 400; Error Code: InvalidAttributeValue; Request ID: {request id})
Why is this failing, and how should I modify the template to ensure that all resources and their associated policies/subscriptions are created successfully?
I found two problems in your CloudFormation template.
The first one, like Marcin said, the resource reference must be the Queue ARN and not the Queue URL.
Resource: !GetAtt SQSQueue.Arn
The second one is that your AWS reference is with your IAM user but it must be the Account ID.
Principal:
AWS:
- !Ref 'AWS::AccountId'
That said, I was able to create successfully the CloudFormation Stack in my account with this CloudFormation Template:
AWSTemplateFormatVersion: 2010-09-09
Description: Creates all resources necessary to send SES emails & track bounces/complaints through AWS
Resources:
IAMUser:
Type: 'AWS::IAM::User'
Properties:
UserName: iam-ses-sqs
SQSQueue:
Type: 'AWS::SQS::Queue'
Properties:
QueueName: ses-queue
SQSQueuePolicy:
Type: 'AWS::SQS::QueuePolicy'
Properties:
Queues:
- !Ref SQSQueue
PolicyDocument:
Statement:
- Action:
- 'SQS:ReceiveMessage'
- 'SQS:DeleteMessage'
- 'SQS:GetQueueAttributes'
Effect: Allow
Resource: !GetAtt SQSQueue.Arn
Principal:
AWS:
- !Ref 'AWS::AccountId'
The following will return queue URL, not ARN:
Resource: !Ref SQSQueue
But you need to use queue ARN in the policy:
Resource: !GetAtt SQSQueue.Arn
The following cloudformation script sets up an Api Gateway method that proxies to an S3 bucket.
The S3BucketPolicy opens up the bucket to public read access but the AWS UI warns that this should never be done.
I tried setting the S3BucketPolicy Principal to service apigateway.amazonaws.com but this results in Access Denied.
1) What is the right way to limit bucket access to the API gateway function? (Sample YAML would be great)
2) How could I debug this Access Denied failure to get more information on why it failed?
3) Where should I be looking for sample code on what should be a very standard template snippet?
ATTEMPT #1 - Works but only by making the S3 Bucket Public otherwise Access Denied
AWSTemplateFormatVersion: 2010-09-09
Parameters:
S3BucketName:
Type: String
Description: >
Name for the S3 bucket that contains the nested templates.
Resources:
RestAPI:
Type: 'AWS::ApiGateway::RestApi'
Properties:
BinaryMediaTypes:
- '*/*'
Name: !Ref 'AWS::StackName'
RestAPIRootGET:
Type: 'AWS::ApiGateway::Method'
Properties:
AuthorizationType: NONE
HttpMethod: GET
Integration:
IntegrationHttpMethod: GET
PassthroughBehavior: WHEN_NO_MATCH
Type: HTTP_PROXY
Uri: !Sub https://${S3BucketName}.s3.amazonaws.com/static-assets/index.html
ResourceId: !GetAtt RestAPI.RootResourceId
RestApiId: !Ref RestAPI
DependsOn:
- RestAPI
BucketPolicy:
Type: AWS::S3::BucketPolicy
Properties:
Bucket: !Ref S3BucketName
PolicyDocument:
Version: 2012-10-17
Statement:
-
Sid: GetObject
Effect: Allow
Principal: "*"
Action:
- s3:*
Resource:
- !Sub 'arn:aws:s3:::${S3BucketName}/static-assets/*'
I think perhaps the right away is to create a role with access to the bucket and then have the ApiGateway assume this role but I'm having a hard time finding documentation that explains how to do this in a cloudformation template. (see also Michael - sqlbot comment suggesting using the credentials property of the method)
Here is my attempt which still fails with Access Denied
ATTEMPT #2 - Access Denied
AWSTemplateFormatVersion: 2010-09-09
Parameters:
S3BucketName:
Type: String
Description: >
Name for the S3 bucket that contains the nested templates.
Resources:
RestAPI:
Type: 'AWS::ApiGateway::RestApi'
Properties:
BinaryMediaTypes:
- '*/*'
Name: !Ref 'AWS::StackName'
RestAPIRootGET:
Type: 'AWS::ApiGateway::Method'
Properties:
AuthorizationType: NONE
HttpMethod: GET
Integration:
IntegrationHttpMethod: GET
PassthroughBehavior: WHEN_NO_MATCH
Type: HTTP_PROXY
Uri: !Sub https://${S3BucketName}.s3.amazonaws.com/static-assets/index.html
Credentials: !GetAtt AllowStaticAccessRole.Arn
ResourceId: !GetAtt RestAPI.RootResourceId
RestApiId: !Ref RestAPI
DependsOn:
- RestAPI
- AllowStaticAccessRole
AllowStaticAccessRole:
Type: "AWS::IAM::Role"
Properties:
AssumeRolePolicyDocument:
Version: "2012-10-17"
Statement:
-
Effect: "Allow"
Principal:
Service:
- "apigateway.amazonaws.com"
Action:
- "sts:AssumeRole"
Path: "/"
Policies:
-
PolicyName: "AllowStaticAccessPolicy"
PolicyDocument:
Version: "2012-10-17"
Statement:
-
Effect: "Allow"
Action:
- s3:*
Resource:
- !Sub 'arn:aws:s3:::${S3BucketName}/static-assets/*'
As already mentioned in the comments, the Access Denied error could be coming from KMS rather than from the S3 itself.
To solve the issue, you need to add at minimum these permissions to the role that the Api Gateway assumes: "kms:Decrypt", "kms:ReEncryptFrom", preferably also stating which Resource this should apply too for proper least privilege implementation.
I have created a policy template and outputted the ARN:
Resources:
# Codebuild Policies
CodeBuildServiceRolePolicy1:
Type: AWS::IAM::ManagedPolicy
Properties:
Description: 'This service role enables AWS CodePipeline to interact with other AWS services, including AWS CodeBuild, on your behalf'
Path: "/"
PolicyDocument:
Version: "2012-10-17"
Statement:
- Resource: "*"
Effect: "Allow"
Action:
...
Outputs:
StackName:
Value: !Ref AWS::StackName
CodeBuildServiceRolePolicy:
Description: The ARN of the ManagedPolicy1
Value: !Ref CodeBuildServiceRolePolicy1
Export:
Name: !Sub '${EnvironmentName}-CodeBuildServiceRolePolicy1'
Now I want o import these Policy into a template with Roles and
# Codebuilding service role
CodeBuildRole:
Type: AWS::IAM::Role
Properties:
RoleName: !Sub ${EnvironmentName}-CodeBuildRole
AssumeRolePolicyDocument:
Statement:
- Action: ["sts:AssumeRole"]
Effect: Allow
Principal:
Service: [codebuild.amazonaws.com]
Version: "2012-10-17"
Path: /
Policies:
- PolicyDocument:
Fn::ImportValue:
!Sub ${EnvironmentName}-CodeBuildServiceRolePolicy1'
But this fails. I'm getting an error, what is wrong?
merci in advance
A
Have you tried to reference the Managed Policy you created with your first stack, using the !Ref function?
The CF for the policy:
AWSTemplateFormatVersion: "2010-09-09"
Resources:
CodeBuildServiceRolePolicy1:
Type: AWS::IAM::ManagedPolicy
Properties:
Path: "/"
PolicyDocument:
...
Outputs:
CodeBuildServiceRolePolicy:
Value: !Ref CodeBuildServiceRolePolicy1.Arn
The CF for the role:
AWSTemplateFormatVersion: "2010-09-09"
Parameters:
PolicyName:
Type: String
Resources:
CodeBuildRole:
Type: "AWS::IAM::Role"
Properties:
Path: "/"
Policies: !Ref PolicyName
Also checkout the docs for Cloudformation IAM an CloudFormation Functions
The solution is to use the AWS resource Type: AWS::IAM::ManagedPolicy instead of AWS::IAM::Policy .
If you use AWS::IAM::ManagedPolicy you can export the policy ARN like this
CodeBuildServiceRolePolicy:
Description: ARN of the managed policy
Value: !Ref CodeBuildServiceRolePolicy
and import it into another template with fn::ImportValue or fn::GetAtt
Using AWS::IAM::Policy only allows to create inline policies which cannot be referenced.