Api gateway resource policy iam role. A private API must have a resource policy to deploy.

Api gateway resource policy iam role. It seems that for the IAM Roles authorization via Resource Policies I'd need to change the API Gateway resource configurations to use AWS_IAM as auth method instead of LAMBDA. For more information, see Control access to a REST API with API Gateway resource policies. Leverage Terraform to manage your resources efficiently. The following example resource policy grants API access in one Amazon account to two roles in a different Amazon account via Signature Version 4 (SigV4) or Signature Version 4a (SigV4a) protocols. Feb 12, 2025 · If API Gateway users define a new API gateway with a serverless function in OCI Functions as an API back end, the API Gateway service verifies that the new API gateway will have access to the specified function. You can specify who is trusted to assume the role. Service-linked roles are predefined by API Gateway and include all the permissions that the service requires to call other Amazon services on your behalf. The defined permissions include the trust policy and the permissions policy, and that permissions policy cannot be attached to any other IAM entity. AssumeRole” permissions to be able to assume this IAM role. For complete policy language information, see Overview of IAM Policies and AWS Identity and Access Management Policy Reference in the IAM User Guide. Jan 21, 2025 · Amazon API Gateway resource policies are JSON policy documents that you attach to an API to control whether a specified principal (typically an IAM role or group) can invoke the API. What is Amazon API Gateway? API Gateway enables creating, publishing, monitoring, securing REST, HTTP, WebSocket APIs for accessing AWS services, data, business logic. May 18, 2020 · The policy for API Gateway is a resource policy, the IAM policy can only be attached to users, groups and roles. google_api_gateway_gateway_iam_binding: Authoritative for a given role. When you create your IAM policy statement, you might need to consider the how API Gateway resource policies affect the authorization workflow. If possible, I would like to do this via the IAM role attached to the user in account A. py: It includes basic lambda handler with basic HTML code, and REST Sep 12, 2022 · AWS Lambda Permissions: Execution Role and Resource-based Policies AWS has a service that handle permissions, which name is AWS Identity and Access Management (IAM). A few examples: 1. When using IAM-based authorization, clients are required to sign their requests using AWS credentials with Hi Team, I have added a resource policy to my API Gateway that restricts access to calls made only from a specific account, as well as the account where the API Gateway itself resides (to allow ca To allow an API developer to create and manage an API in API Gateway, you must create IAM permissions policies that allow a specified API developer to create, update, deploy, view, or delete required API entities. Amazon API Gateway resource policies are JSON policy documents that you attach to an API to control whether a specified principal (typically an IAM role or group) can invoke the API. Apr 11, 2023 · The API gateway offers various options for authenticating and authorizing API access. The Lambda authorizer takes the caller's identity as the input and returns an IAM policy as the output. By integrating OCI IAM with API Gateway authentication and authorization—enhanced by an Authorizer Function—you can ensure secure and controlled access to your APIs. authorizer_result_ttl_in_seconds - (Optional) The TTL of cached authorizer results in seconds. Lists all of the available service-specific resources, actions, and condition keys that can be used in IAM policies to control access to Amazon API Gateway. Resource policies are specified using the same syntax as IAM policies. First, create an IAM role called ExampleAPIExecutionRole for API Gateway. While I did not specify any tags I get the following error: Did not have IAM permissions to process tags on AWS::ApiGateway::RestApi. There are two mechanisms for API Gateway to invoke your lambda from a security perspective. Roles can also be granted using the API, or with the Google Cloud CLI. This page describes the basic elements used in Amazon API Gateway resource policies. I want to activate AWS Identity and Access Management (IAM) authentication for cross-account access to my Amazon API Gateway HTTP API. When you delete a stack containing this resource, API Gateway can still assume the provided IAM role to write API logs to CloudWatch Logs. Assigned to IAM roles are permissions dictating what the role can and cannot do. Argument Reference This resource supports the following arguments: region - (Optional) Region where this resource will be managed. Sets the IAM policy for the apiconfig and replaces any existing policy already attached. Resource policies let you create resource-based policies to allow or deny access to your APIs and methods from specified source IP addresses or VPC endpoints. AWS evaluates these policies when an IAM principal (user or role) makes a request. For more information, see How API Gateway resource policies affect authorization workflow. API Gateway defines the permissions of its service-linked roles, and unless defined otherwise, only API Gateway can assume its roles. 14. Learn example API Gateway resource policies. To do this, you use the ApiAuth data type. google_api_gateway_api_config_iam_member: Non API Gateway calls AWS Security Token Service in order to assume the IAM role, so make sure that AWS STS is enabled for the Region. By the end of this guide, you will have a working API that triggers your Lambda function upon receiving HTTP requests. Protect your data and ensure compliance effectively. An administrator must create IAM policies that grant permission sets and roles permission to perform specific API operations on the specified resources they need. This article will guide you through the process, ensuring your serverless applications are secure and efficient. Jul 3, 2018 · API Gateway resource policies are JSON policy documents that you attach to an API to control whether a specified principal (typically, an IAM user or role) can invoke the API. Ensure that IAM roles with administrative permissions are not assigned to IAM identities (users, groups, and service accounts) managing API Gateway resources. When a client makes a request to your API's method, API Gateway calls your Lambda authorizer. Resource-based policies in AWS Lambda provide a mechanism to control which AWS accounts, services, or IAM principals can invoke or interact with your Lambda function. For inbound AS2 transfers, the access role uses the Amazon Resource Name (ARN) for the agreement. Choose the Yes or Partial link to see the documentation for services that support these roles. Go to latest version Feb 1, 2025 · The aws_iam_role resource type will create an IAM role for us, and we can create an assume role policy that allows the Lambda Service to assume this role. The administrator must then attach those policies to the IAM users or groups that require those permissions. I would like a user from account A to be able to execute API deployed in account B. IAM administrators control who can be authenticated (signed in) and authorized (have permissions) to use API Gateway resources. Roles that control access to services and resources You can view and grant roles using the permissions panel on the API Gateway > APIs or Gateways detail pages in the Google Cloud console. An IAM administrator must create IAM policies that grant users and roles permission to perform specific API operations on the specified resources they need. For more information, see Managing AWS STS in an AWS Region. deploymentRole to specify a limited-access IAM role for your serverless deployment, the custom resource lambda will assume this role during execution. You might need to create an eventbridge IAM role that will be used as the principal in that policy. A service-linked role is a unique type of IAM role that is linked directly to API Gateway. For accessing API Gateway REST APIs, turn on IAM authentication for an API method in the API Gateway console. However, the customer wants to do a secondary check on the downstream app for an end to end validation so it needs to know the IAM role used for the original request to the API Gateway. This helps enforce the Principle of Least Privilege (POLP) by granting members (principals) only the minimum access necessary to complete their tasks. 1. To allow a user to access your API by calling the API execution service, you must create an API Gateway resource policy and attach the policy to the API. To specify an IAM Role for API Gateway to assume, use the IAM Role ARN. com The following example resource policy grants API access in one AWS account to two roles in a different AWS account via Signature Version 4 (SigV4) or Signature Version 4a (SigV4a) protocols. HTTP APIs The option to use resource policies to provide IAM authentication for cross-accounts isn't available for API Gateway HTTP APIs. Feb 2, 2024 · Learn how to implement IAM-based access control in API Gateway with this step-by-step demo. You can use a resource-based policy or an IAM role to grant API Gateway permissions to invoke a Lambda function. I did not realise that changes made didn't take affect until (re)deployment. Transfer Family assumes this role in the context of a Transfer Family server ARN. AWS Console You can add a resource based policy for your API Gateway to invoke your Lambda function on AWS API Gateway console. With IAM identity-based policies, you can specify which actions and resources are allowed or denied as well as the conditions under which actions are allowed or denied. See full list on stackoverflow. Mar 13, 2024 · Create an API Gateway with IAM authorizer using AWS CDK. API Gateway supports specific actions, resources, and condition keys. Aug 23, 2021 · I built a SAM template to deploy a AWS::Serverless::Api resource. For outbound AS2 transfers, the access role uses the ARN for the connector. They also can't perform tasks using the AWS Management Console, AWS CLI, or AWS SDKs. To deny API Gateway access to write API logs to CloudWatch logs, update the permissions policies or change the IAM role to deny access. Oct 2, 2025 · Allow principals to create, update, or delete API Gateway resources. Use resource policies to control whether a specified principal (typically an IAM user or role) can invoke the API. By default, IAM users and roles don't have permission to create or modify API Gateway resources. My guess is that it’s not the events service but rather an IAM principal assumed by event bridge thats actually invoking the API. To provide access, you have to create a policy that grants API gateways access to functions defined in OCI Functions. For more information, see IAM authentication and resource policy and Identity-based policies and resource-based policies. Sep 26, 2023 · Amazon API Gateway gets permission to invoke your function from the function's resource-based policy. That's all working fine. Resource policies – Resource policies are JSON policy documents that you can attach to an API Gateway API. No If you're using iam. You can use the sts:AssumeRole API action to assume a role for the HTTP API account. These are the steps to add a resource based policy. tf: It includes api-gateway resource and method definition, lambda - api gateway connection, deploying api gateway, api-gateway deployment URL as output code/main. Allow only certain organizations or resources to access your VPC endpoint and invoke your API. This article gives you an overview of the built-in and custom roles in API Management. To test access, use your existing API Gateway REST API or create an example REST API. Nov 22, 2024 · For resource-based policy examples, see . Choose based on required capabilities. You are viewing the documentation for version 5. Sets the IAM policy for the gateway and replaces any existing policy already attached. IAM identity-based policies are attached to IAM users, groups, or roles and define what actions those identities are capable of doing on which resources. Feb 26, 2025 · We have a Lambda function on aws which is exposed via api gateway. tf: It includes lambda function, lambda role, policy, policy-role attachment, lambda api gateway permission, zipping code api-gateway. ", Manage access in AWS by creating policies and attaching them to IAM identities (users, groups of users, or roles) or AWS resources. Dec 20, 2021 · The important part is that Action: execute-api:Invoke is what grants permission to invoke an API Gateway route. API Gateway resource policies are different from IAM identity-based policies. Updates the Aug 5, 2024 · Alternatively, you can create a resource policy for the API Gateway to explicitly allow each IAM user from the other AWS account to access the APIs. API Gateway assumes a role and calls your lambda using your role API Gateway Invokes the lambda and you have given permission to API Gateway in the resource-attached policy for that lambda function. Your Lambda function will perform create, read Use a Lambda authorizer (formerly known as a custom authorizer) to control access to your API. I tried to look at API gateway resource policies and tried to whitelist the accountB 's EC2 IAM role in accountA API Gateway's resource policy and still, I'm getting the same error. Jun 20, 2025 · Learn how to simplify API Gateway authorization through IAM integration with AWS Lambda, enhancing security and optimizing access management for your applications. 0. Service-linked roles – A service-linked role is a special type of service role that gives the service permission to access resources in other services on your behalf. As background, I have used this behaviour of StringNotEqual in my API Gateway policy to deny API calls from everyone except the matching vpces - so pretty similar to yours. Specifically, the developer and the administrator role for the Amazon account identified by account-id-2 are granted the execute-api:Invoke action to May 31, 2019 · In this case it turned out the major blocker was the API gateway IP Restrictions set in the policy were getting in the way. In this tutorial, you create a REST API through which you invoke a Lambda function using an HTTP request. API Gatewayでリソースポリシーを設定する まず、API Gatewayのアクセスポリシーを以下のように設定します。 この設定により、特定のIAMロール以外からのリクエストを拒否し Aug 10, 2019 · Try doing the following: Use the test button in API Gateway to confirm if you can call your Lambda function from within it. Discover the importance of access control in authentication and authorization, and how it can help Jul 30, 2024 · Step-by-Step Guide: Deploying a REST API in AWS with Terraform How to Create API Gateway Using Terraform & AWS Lambda Enterprise companies use Terraform to deploy their API implementations … Mar 31, 2015 · To specify an IAM Role for API Gateway to assume, use the IAM Role ARN. Note Resource policies aren't currently supported for HTTP APIs. To learn more, see AWS Lambda Permissions in the AWS Lambda Developer Guide. Use these references to create your IAM policy statement. Using this resource policy a private API Gateway can be restricted to be invoked by both an IAM role and a VPC endpoint. Check the permissions and try again. I want to allow people outside of my AWS account to access my API Gateway resources You can create a role that users in other accounts or people outside of your organization can use to access your resources. You attach the permissions policy to a user, role, or group. The following is a simple policy that would grant access to all routes. Tighten the security perimeter of your application while migrating from on premises to AWS. This policy is attached directly to the API Dec 27, 2024 · 上記の環境が整っていることを確認してから、本文の手順に進んでください。 手順 1. Mar 6, 2025 · This blog explores how to leverage custom scopes to enforce fine-grained access control on OIC REST endpoints. Defaults to the Region set in the provider configuration. google_api_gateway_api_config_iam_binding: Authoritative for a given role. To enact access control to an AWS service, you can use either the caller-based permissions model, where a permissions policy is directly attached to the caller's user or group, or the role-based permission model, where a permissions policy is attached to an IAM role that API Gateway can assume. 82. Then, use IAM policies and resource policies to designate permissions for your API's users. Sep 9, 2010 · You can control access to your APIs by attaching a resource policy within your AWS SAM template. Amazon API Gateway resource policies are JSON policy documents that you attach to an API to control whether a specified principal (typically an IAM user or role) can invoke the API. authorizer_uri - (Optional, required for type TOKEN / REQUEST) Authorizer's Uniform Resource Identifier (URI). Oct 17, 2012 · Question How to attach the assumable role with the lambda invocations to an API Gateway API or all methods? Create an API Gateway API for AWS Lambda Functions tells to attach an IAM policy to inv You can use API Gateway resource-based policies with IAM policies to manage access to your API. Members can be user accounts, service accounts, Google groups, and domains (such as G Suite). To search through all roles and permissions, see the role and permission index. For services that support resource-based policies or access control lists (ACLs), you can use those policies to grant people access to Argument Reference This resource supports the following arguments: region - (Optional) Region where this resource will be managed. Dec 21, 2020 · Apart from the general use case / advantages of having resource-based policy that is explained pretty well here does not have to give up his or her permissions to receive the role permissions In this specific case, I have experienced 2 distintive advantages using Lambda's resource based policy over role The creator of Lambda - API Gateway integration does not need to have access to IAM. Other roles within the IAM policy for the apiconfig are preserved. A Policy is a collection of bindings. I know I can achieve this by attaching the Resource Policy in account B. So We can use “AWS Identity Mar 15, 2025 · You will learn how to define the necessary IAM roles, create the Lambda function, configure API Gateway, and deploy everything using Terraform. Amazon Identity and Access Management (IAM) is an Amazon Web Services service that helps an administrator securely control access to Amazon resources. Invocation role – For use with Amazon API Gateway as the server's custom identity provider. May 22, 2019 · Solutions 1. AWS API Gateway provides several authentication options including API Gateway Resource Policies, IAM permissions, and VPC Endpoint Policies. A binding binds one or more members to a single role. Once I did that with updated IP restrictions the API endpoint could be invoked. This way, you can indicate that lambda function is in charge of its own interactions permissions. Nov 3, 2021 · "integrationErrorMessage": "The IAM role configured on the integration or API Gateway doesn't have permissions to call the integration. Mar 13, 2023 · In order for API Gateway to run and interact with resources in your account it must first assume an IAM role. Aug 13, 2025 · Learn how to create Least Privilege IAM Roles for API Gateway with this step-by-step guide, ensuring secure and controlled access to your API resources. For a single valued incoming-key, there is probably no reason to use ForAllValues. An Identity and Access Management (IAM) policy, which specifies access controls for Google Cloud resources. API Gateway roles IAM policy for API Gateway Gateway Three different resources help you manage your IAM policy for API Gateway Gateway. Call API Gateway with AWS Sign v4 Authorization header using AWS SDK in NodeJS, ReactJS & Golang. If you update the resource policy, you'll need to deploy the API. See more in AWS Docs. Amazon API Gateway uses Amazon Identity and Access Management (IAM) service-linked roles. IAM is an AWS service that you can use with no additional charge. Aug 25, 2024 · Implementing a secure and scalable API Gateway with Lambda authorizer. Oct 3, 2025 · This page lists the IAM roles and permissions for API Gateway. When you attach a policy to your API, it applies the permissions in the policy to the methods in the API. For more information, see Temporary security credentials in IAM. Standard AWS IAM roles and policies offer flexible and robust access controls that can be applied to an entire API or individual methods. Logging & monitoring can be enabled/disabled and otherwise tuned on the API Gateway API Gateway invokes your API route only if the client has execute-api permission for the route. Apr 22, 2025 · There are 3 main parts: lambda. A role is a named list of permissions; each role can be an IAM predefined role or a user-created When working with AWS Lambda and API Gateway, understanding how to implement IAM (Identity and Access Management) roles and policies is crucial. If needed, you could build more specific policies by replacing those wildcards (at the end of the “Resource” value) with HTTP methods and/or paths. Logging & monitoring can be enabled/disabled and otherwise tuned on the API Gateway We would like to show you a description here but the site won’t allow us. A policy is an object in AWS that, when associated with an identity or resource, defines their permissions. On that api, we have a resource policy to restrict traffic so only ip addresses in our firm can access the endpoint. IAM POLICY EVALUATION TABLES TABLE A SAME ACCOUNT : When access to an API Gateway API is controlled by an IAM policy (or a Lambda or Amazon Cognito user pools authorizer) and an API Gateway resource policy, both of which are in the same AWS account. You will need to apply this to each API Gateways resource policy, if you want to reuse try looking at IaC. Sep 20, 2023 · AWS lambda and API gateway in TERRAFORM. To assess your resource policies, you need to call the GetPolicy API; the execution role controls what your code a do in Lambda, not who can call it. Jun 6, 2023 · I have an API Gateway with the following API proxy endpoint that calls a Lambda function for retrieving data from a dynamodb table: This is the policy associated to the IAM role attached to the La Jun 20, 2025 · Learn how to enhance your API Gateway security with our step-by-step guide on auditing IAM policies. Use a single policy and avoid session-based or role-based policies to control traffic to your API. A private API must have a resource policy to deploy. Mar 25, 2021 · I have API Gateway endpoints deployed in account B and has aws iam as authoriser. For private APIs, you should use a combination of an API Gateway resource policy and a VPC endpoint policy. You can also turn on logging in API Gateway, which is a good way to gain additional insight into what it's doing on your Oct 17, 2012 · Understand how resource policies work with other authorization mechanisms to control access to your Amazon API Gateway resources. The assumed role provides temporary security credentials that you can use to invoke the HTTP API in another account. IAM authorization for HTTP APIs is similar to that for REST APIs. If you use the PetStore example API, then proceed to Create and attach a resource policy. This must be a well-formed Lambda function URI in the form of arn:aws:apigateway:{region}:lambda Jan 24, 2024 · The AWS documentation is not clear about the options for this mix of use cases. These policies are essential for defining cross-account access or allowing other AWS services (such as S3 or API Gateway) to securely interact with your Lambda function. To provide access, add permissions to your users, groups, or roles: Oct 17, 2012 · API Gateway offers REST APIs with advanced features like API keys, throttling, and AWS WAF integration, and HTTP APIs with minimal features for lower pricing. API Gateway will check the resource policy when IAM_AUTH is enabled to make sure that the role is valid. The following is an example AWS SAM template for a private API. The latest version is 6. Apr 6, 2020 · The following sample policy allows the IAM roles within the account that has the “sts. cloudwatch_role_arn - (Optional) ARN of an IAM role for CloudWatch (to allow logging & monitoring). For examples of IAM policies that grant clients the permission to invoke APIs, see Control access for invoking an API. Updates the IAM policy to grant a role to a list of members. If IAM User/Role policy ALLOWS but In API Gateway resource policy an Explicit Allow could not be found then as per Row 2, access AWS Identity and Access Management (IAM) is an AWS service that helps an administrator securely control access to AWS resources. Next we create a aws_iam_role_policy_attachment that allows us to attach the AWSLambdaBasicExecutionRole, which will allow the Lambda to run and to write logs to CloudWatch. Each of these resources serves a different use case: google_api_gateway_gateway_iam_policy: Authoritative. Aug 8, 2025 · APPLIES TO: All API Management tiers Azure API Management relies on Azure role-based access control (Azure RBAC) to enable fine-grained access management for API Management services and entities including workspaces.