Question:
I was editing my CloudFormation templates and suddenly AWS tells me I need CAPABILITY_NAMED_IAM. I am curious as to which change triggers this?
What is a named IAM resource?
Before I already “name” my resources like
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RoleName: !Sub '${PipelineName}-codebuild' |
I am not asked to add this capability, I think until I add
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Parameters: AppName: Type: String Description: Prefix for resources Resources: LambdaRole: Type: AWS::IAM::Role Properties: RoleName: !Ref AppName |
To my SAM application template. But arent they the “same” except one uses !Ref? Or maybe some other change triggered this?
For reference, my CodePipeline stack
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AWSTemplateFormatVersion : '2010-09-09' Description: 'Skynet stack for CodePipeline' Parameters: PipelineName: Type: String Description: Pipeline Name (Lower case only, since S3 bucket names can only have lowercase) Default: skynet-pipeline GitHubOwner: Type: String Description: GitHub Owner Default: 2359media GitHubRepo: Type: String Description: GitHub Repo Default: 'skynet' GitHubBranch: Type: String Description: GitHub Branch Default: master GitHubToken: Type: String Description: GitHub Token NoEcho: true Resources: Pipeline: Type: AWS::CodePipeline::Pipeline Properties: Name: !Ref PipelineName RoleArn: !GetAtt [PipelineRole, Arn] ArtifactStore: Location: !Ref PipelineArtifactStore Type: S3 DisableInboundStageTransitions: [] Stages: - Name: GitHubSource Actions: - Name: Source ActionTypeId: Category: Source Owner: ThirdParty Version: 1 Provider: GitHub Configuration: Owner: !Ref GitHubOwner Repo: !Ref GitHubRepo Branch: !Ref GitHubBranch OAuthToken: !Ref GitHubToken OutputArtifacts: - Name: SourceCode - Name: Build Actions: - Name: Lambda InputArtifacts: - Name: SourceCode OutputArtifacts: - Name: LambdaPackage ActionTypeId: Category: Build Owner: AWS Version: 1 Provider: CodeBuild Configuration: ProjectName: !Ref CodeBuildLambda - Name: CreateChangeSet Actions: - Name: Lambda InputArtifacts: - Name: LambdaPackage OutputArtifacts: - Name: LambdaDeployment ActionTypeId: Category: Deploy Owner: AWS Version: 1 Provider: CloudFormation Configuration: ActionMode: CHANGE_SET_REPLACE ChangeSetName: !Sub - '${PipelineName}-lambda' - {PipelineName: !Ref PipelineName} RoleArn: !GetAtt [CloudFormationRole, Arn] StackName: !Sub - '${PipelineName}-lambda' - {PipelineName: !Ref PipelineName} TemplatePath: 'LambdaPackage::SkynetLambdaPackaged.yml' Capabilities: CAPABILITY_NAMED_IAM ParameterOverrides: !Sub '{"AppName": "${PipelineName}-lambda"}' - Name: ExecuteChangeSet Actions: - Name: Lambda ActionTypeId: Category: Deploy Owner: AWS Version: 1 Provider: CloudFormation Configuration: ActionMode: CHANGE_SET_EXECUTE ChangeSetName: !Sub - '${PipelineName}-lambda' - {PipelineName: !Ref PipelineName} StackName: !Sub - '${PipelineName}-lambda' - {PipelineName: !Ref PipelineName} CodeBuildLambda: Type: AWS::CodeBuild::Project Properties: Name: !Sub '${PipelineName}-lambda' Artifacts: Type: CODEPIPELINE Environment: ComputeType: BUILD_GENERAL1_SMALL Image: aws/codebuild/nodejs:7.0.0 Type: LINUX_CONTAINER EnvironmentVariables: - Name: S3_BUCKET Value: !Ref PipelineArtifactStore ServiceRole: !Ref CodeBuildRole Source: BuildSpec: 'lambda/buildspec.yml' Type: CODEPIPELINE PipelineArtifactStore: Type: AWS::S3::Bucket Properties: BucketName: !Sub '${PipelineName}-artifacts' VersioningConfiguration: Status: Enabled CodeBuildRole: Type: AWS::IAM::Role Properties: RoleName: !Sub '${PipelineName}-codebuild' AssumeRolePolicyDocument: Version: '2012-10-17' Statement: Effect: Allow Principal: Service: codebuild.amazonaws.com Action: sts:AssumeRole Policies: - PolicyName: !Sub '${PipelineName}-codebuild' PolicyDocument: Version: '2012-10-17' Statement: - Effect: Allow Resource: 'arn:aws:logs:*:*:*' Action: - 'logs:CreateLogGroup' - 'logs:CreateLogStream' - 'logs:PutLogEvents' - Effect: Allow Resource: - !Sub 'arn:aws:s3:::codepipeline-${AWS::Region}-*/*' - !Sub - '${PipelineArtifactStoreArn}/*' - {PipelineArtifactStoreArn: !GetAtt [PipelineArtifactStore, Arn]} Action: - 's3:GetObject' - 's3:GetObjectVersion' - 's3:PutObject' CloudFormationRole: Type: AWS::IAM::Role Properties: RoleName: !Sub '${PipelineName}-cloudformation' AssumeRolePolicyDocument: Version: '2012-10-17' Statement: - Effect: Allow Principal: Service: cloudformation.amazonaws.com Action: - sts:AssumeRole ManagedPolicyArns: - 'arn:aws:iam::aws:policy/AWSLambdaExecute' Policies: - PolicyName: !Sub '${PipelineName}-cloudformation' PolicyDocument: Version: '2012-10-17' Statement: - Effect: Allow Resource: '*' Action: - 's3:GetObject' - 's3:GetObjectVersion' - 's3:GetBucketVersioning' - Effect: Allow Resource: 'arn:aws:s3:::codepipeline*' Action: - 's3:PutObject' - Effect: Allow Resource: !Sub 'arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:*' Action: - 'lambda:*' - Effect: Allow Resource: !Sub 'arn:aws:apigateway:${AWS::Region}::*' Action: - 'apigateway:*' - Effect: Allow Resource: '*' Action: - 'lambda:CreateEventSourceMapping' - 'lambda:DeleteEventSourceMapping' - 'lambda:GetEventSourceMapping' - Effect: Allow Resource: '*' Action: - 'iam:GetRole' - 'iam:CreateRole' - 'iam:DeleteRole' - 'iam:PassRole' - 'iam:AttachRolePolicy' - 'iam:DetachRolePolicy' - 'iam:DeleteRolePolicy' - 'iam:PutRolePolicy' - Effect: Allow Resource: '*' Action: - 'iam:PassRole' - Effect: Allow Resource: !Sub 'arn:aws:cloudformation:${AWS::Region}:aws:transform/Serverless-2016-10-31' Action: - 'cloudformation:CreateChangeSet' PipelineRole: Type: AWS::IAM::Role Properties: RoleName: !Sub '${PipelineName}-pipeline' AssumeRolePolicyDocument: Version: '2012-10-17' Statement: - Action: ['sts:AssumeRole'] Effect: Allow Principal: Service: [codepipeline.amazonaws.com] Path: / Policies: - PolicyName: SkynetPipeline PolicyDocument: Version: '2012-10-17' Statement: - Action: - 's3:GetObject' - 's3:GetObjectVersion' - 's3:GetBucketVersioning' Effect: 'Allow' Resource: '*' - Action: - 's3:PutObject' Effect: 'Allow' Resource: - !GetAtt [PipelineArtifactStore, Arn] - Action: - 'codecommit:CancelUploadArchive' - 'codecommit:GetBranch' - 'codecommit:GetCommit' - 'codecommit:GetUploadArchiveStatus' - 'codecommit:UploadArchive' Effect: 'Allow' Resource: '*' - Action: - 'codedeploy:CreateDeployment' - 'codedeploy:GetApplicationRevision' - 'codedeploy:GetDeployment' - 'codedeploy:GetDeploymentConfig' - 'codedeploy:RegisterApplicationRevision' Effect: 'Allow' Resource: '*' - Action: - 'elasticbeanstalk:*' - 'ec2:*' - 'elasticloadbalancing:*' - 'autoscaling:*' - 'cloudwatch:*' - 's3:*' - 'sns:*' - 'cloudformation:*' - 'rds:*' - 'sqs:*' - 'ecs:*' - 'iam:PassRole' Effect: 'Allow' Resource: '*' - Action: - 'lambda:InvokeFunction' - 'lambda:ListFunctions' Effect: 'Allow' Resource: '*' - Action: - 'opsworks:CreateDeployment' - 'opsworks:DescribeApps' - 'opsworks:DescribeCommands' - 'opsworks:DescribeDeployments' - 'opsworks:DescribeInstances' - 'opsworks:DescribeStacks' - 'opsworks:UpdateApp' - 'opsworks:UpdateStack' Effect: 'Allow' Resource: '*' - Action: - 'cloudformation:CreateStack' - 'cloudformation:DeleteStack' - 'cloudformation:DescribeStacks' - 'cloudformation:UpdateStack' - 'cloudformation:CreateChangeSet' - 'cloudformation:DeleteChangeSet' - 'cloudformation:DescribeChangeSet' - 'cloudformation:ExecuteChangeSet' - 'cloudformation:SetStackPolicy' - 'cloudformation:ValidateTemplate' - 'iam:PassRole' Effect: 'Allow' Resource: '*' - Action: - 'codebuild:BatchGetBuilds' - 'codebuild:StartBuild' Effect: 'Allow' Resource: '*' |
The part of SAM stack (sam.yml) changed recently
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AWSTemplateFormatVersion : '2010-09-09' Transform: AWS::Serverless-2016-10-31 Description: 'Skynet. AWS Management Assistant' Parameters: AppName: Type: String Description: Prefix for resources Resources: LambdaRole: Type: AWS::IAM::Role Properties: RoleName: !Ref AppName AssumeRolePolicyDocument: Version: '2012-10-17' Statement: - Effect: Allow Principal: Service: - lambda.amazonaws.com - apigateway.amazonaws.com Action: - sts:AssumeRole ManagedPolicyArns: - 'arn:aws:iam::aws:policy/AmazonEC2FullAccess' - 'arn:aws:iam::aws:policy/AWSLambdaFullAccess' - 'arn:aws:iam::aws:policy/AWSXrayWriteOnlyAccess' - 'arn:aws:iam::aws:policy/AmazonAPIGatewayInvokeFullAccess' - 'arn:aws:iam::aws:policy/CloudWatchLogsFullAccess' |
Answer:
When are CAPABILITY_IAM/CAPABILITY_NAMED_IAM Required
According to CloudFormation CreateStack Parameters, one of these is required when your Template includes any of the following resource types:
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AWS::IAM::AccessKey AWS::IAM::Group AWS::IAM::InstanceProfile AWS::IAM::Policy AWS::IAM::Role AWS::IAM::User AWS::IAM::UserToGroupAddition |
When to use CAPABILITY_NAMED_IAM instead of CAPABILITY_IAM
When any of your IAM resources have a custom name, such as a RoleName then CAPABILITY_NAMED_IAM is required.
Why are these required?
The Capabilities are there to ensure you realize that you’re creating IAM resources, that these will modify the permissions on your account, and that you have reviewed these resources and their permissions as necessary.