POST

/2015-03-31/functions/{FunctionName}/policy

http://lambda.{region}.amazonaws.com/2015-03-31/functions/{FunctionName}/policy

Grants an Amazon Web Service, Amazon Web Services account, or Amazon Web Services organization permission to use a function. You can apply the policy at the function level, or specify a qualifier to restrict access to a single version or alias. If you use a qualifier, the invoker must use the full Amazon Resource Name (ARN) of that version or alias to invoke the function. Note: Lambda does not support adding policies to version $LATEST. To grant permission to another account, specify the account ID as the <code>Principal</code>. To grant permission to an organization defined in Organizations, specify the organization ID as the <code>PrincipalOrgID</code>. For Amazon Web Services, the principal is a domain-style identifier that the service defines, such as <code>s3.amazonaws.com</code> or <code>sns.amazonaws.com</code>. For Amazon Web Services, you can also specify the ARN of the associated resource as the <code>SourceArn</code>. If you grant permission to a service principal without specifying the source, other accounts could potentially configure resources in their account to invoke your Lambda function. This operation adds a statement to a resource-based permissions policy for the function. For more information about function policies, see <a href="https://docs.aws.amazon.com/lambda/latest/dg/access-control-resource-based.html">Using resource-based policies for Lambda</a>.

Access Token Required: API Key

Path Parameters

FunctionNamestringrequired

The name of the Lambda function, version, or alias. Name formats <ul> <li> Function name – <code>my-function</code> (name-only), <code>my-function:v1</code> (with alias). </li> <li> Function ARN – <code>arn:aws:lambda:us-west-2:123456789012:function:my-function</code>. </li> <li> Partial ARN – <code>123456789012:function:my-function</code>. </li> </ul> You can append a version number or alias to any of the formats. The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.

Query Params

Qualifierstring

Specify a version or alias to add permissions to a published version of the function.

Body Params

Actionstringrequired

The action that the principal can use on the function. For example, <code>lambda:InvokeFunction</code> or <code>lambda:GetFunction</code>.

Principalstringrequired

The Amazon Web Service or Amazon Web Services account that invokes the function. If you specify a service, use <code>SourceArn</code> or <code>SourceAccount</code> to limit who can invoke the function through that service.

SourceArnstring

For Amazon Web Services, the ARN of the Amazon Web Services resource that invokes the function. For example, an Amazon S3 bucket or Amazon SNS topic. Note that Lambda configures the comparison using the <code>StringLike</code> operator.

RevisionIdstring

Update the policy only if the revision ID matches the ID that's specified. Use this option to avoid modifying a policy that has changed since you last read it.

StatementIdstringrequired

A statement identifier that differentiates the statement from others in the same policy.

SourceAccountstring

For Amazon Web Service, the ID of the Amazon Web Services account that owns the resource. Use this together with <code>SourceArn</code> to ensure that the specified account owns the resource. It is possible for an Amazon S3 bucket to be deleted by its owner and recreated by another account.

PrincipalOrgIDstring

The identifier for your organization in Organizations. Use this to grant permissions to all the Amazon Web Services accounts under this organization.

EventSourceTokenstring

For Alexa Smart Home functions, a token that the invoker must supply.

FunctionUrlAuthTypestring

The type of authentication that your function URL uses. Set to <code>AWS_IAM</code> if you want to restrict access to authenticated users only. Set to <code>NONE</code> if you want to bypass IAM authentication to create a public endpoint. For more information, see <a href="https://docs.aws.amazon.com/lambda/latest/dg/urls-auth.html">Security and auth model for Lambda function URLs</a>.

Responses

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}

Language

CredentialsAPI KEY

API Key

Enter token below to save for later

cURL Request

1curl --request POST \
2     --url 'http://lambda.{region}.amazonaws.com/2015-03-31/functions/{FunctionName}/policy' \
3     --header 'accept: application/json' \
4     --header 'content-type: application/json'

Response

1{
2  "success": true,
3  "data": {
4    "id": "abc123",
5    "created_at": "2025-01-01T00:00:00Z"
6  }
7}

1curl --request POST \ 2 --url 'http://lambda.{region}.amazonaws.com/2015-03-31/functions/{FunctionName}/policy' \ 3 --header 'accept: application/json' \ 4 --header 'content-type: application/json'