AWS Documentation » AWS CloudFormation » User Guide » Template Reference » AWS Resource Types Reference » AWS::Lambda::Permission

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AWS::Lambda::Permission

The AWS::Lambda::Permission resource associates a policy statement with a specific AWS Lambda (Lambda) function's access policy. The function policy grants a specific AWS service or application permission to invoke the function. For more information, see AddPermission in the AWS Lambda Developer Guide.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{
  "Type" : "AWS::Lambda::Permission",
  "Properties" : {
    "Action" : String,
    "EventSourceToken" : String,
    "FunctionName" : String,
    "Principal" : String,
    "SourceAccount" : String,
    "SourceArn" : String
  }
}

YAML

Type: "AWS::Lambda::Permission"
Properties: 
  Action: String
  EventSourceToken: String
  FunctionName: String
  Principal: String
  SourceAccount: String
  SourceArn: String

Properties

For more information and current valid values, see AddPermission in the AWS Lambda Developer Guide.

Action

The Lambda actions that you want to allow in this statement. For example, you can specify lambda:CreateFunction to specify a certain action, or use a wildcard (lambda:*) to grant permission to all Lambda actions. For a list of actions, see Actions and Condition Context Keys for AWS Lambda in the IAM User Guide.

Required: Yes

Type: String

Update requires: Replacement

EventSourceToken

A unique token that must be supplied by the principal invoking the function.

Required: No

Type: String

Update requires: Replacement

FunctionName

The name (physical ID), Amazon Resource Name (ARN), or alias ARN of the Lambda function that you want to associate with this statement. Lambda adds this statement to the function's access policy.

Required: Yes

Type: String

Update requires: Replacement

Principal

The entity for which you are granting permission to invoke the Lambda function. This entity can be any valid AWS service principal, such as s3.amazonaws.com or sns.amazonaws.com, or, if you are granting cross-account permission, an AWS account ID. For example, you might want to allow a custom application in another AWS account to push events to Lambda by invoking your function.

Required: Yes

Type: String

Update requires: Replacement

SourceAccount

The AWS account ID (without hyphens) of the source owner. For example, if you specify an S3 bucket in the SourceArn property, this value is the bucket owner's account ID. You can use this property to ensure that all source principals are owned by a specific account.

Important

This property is not supported by all event sources. For more information, see the SourceAccount parameter for the AddPermission action in the AWS Lambda Developer Guide.

Required: No

Type: String

Update requires: Replacement

SourceArn

The ARN of a resource that is invoking your function. When granting Amazon Simple Storage Service (Amazon S3) permission to invoke your function, specify this property with the bucket ARN as its value. This ensures that events generated only from the specified bucket, not just any bucket from any AWS account that creates a mapping to your function, can invoke the function.

Important

This property is not supported by all event sources. For more information, see the SourceArn parameter for the AddPermission action in the AWS Lambda Developer Guide.

Required: No

Type: String

Update requires: Replacement

Example

The following example grants an S3 bucket permission to invoke a Lambda function.

JSON

"LambdaInvokePermission": {
	"Type": "AWS::Lambda::Permission",
	"Properties": {
		"FunctionName": {
			"Fn::GetAtt": [
				"MyLambdaFunction",
				"Arn"
			]
		},
		"Action": "lambda:InvokeFunction",
		"Principal": "s3.amazonaws.com",
		"SourceAccount": {
			"Ref": "AWS::AccountId"
		},
		"SourceArn": {
			"Fn::GetAtt": [
				"MyBucket",
				"Arn"
			]
		}
	}
}

YAML

LambdaInvokePermission:
  Type: 'AWS::Lambda::Permission'
  Properties:
    FunctionName: !GetAtt 
      - MyLambdaFunction
      - Arn
    Action: 'lambda:InvokeFunction'
    Principal: s3.amazonaws.com
    SourceAccount: !Ref 'AWS::AccountId'
    SourceArn: !GetAtt 
      - MyBucket
      - Arn