Authentication and Access Control for CloudFront
To perform any operation on CloudFront resources, such as creating a web distribution or an invalidation, AWS Identity and Access Management (IAM) requires you to authenticate that you're an approved AWS user. If you're using the CloudFront console, you authenticate your identity by providing your AWS user name and a password. If you're accessing CloudFront programmatically, your application authenticates your identity for you by using access keys or by signing requests.
After you authenticate your identity, IAM controls your access to AWS by verifying that you have permissions to perform operations and access resources. If you are an account administrator, you can use IAM to control the access of other users to the resources that are associated with your account.
This chapter explains how to use AWS Identity and Access Management (IAM) and CloudFront to help secure your resources.
You can access AWS as any of the following types of identities:
AWS account root user – When you sign up for AWS, you provide an email address and password that is associated with your AWS account. These are your root credentials and they provide complete access to all of your AWS resources.
For security reasons, we recommend that you use the root credentials only to create an administrator user, which is an IAM user with full permissions to your AWS account. Then, you can use this administrator user to create other IAM users and roles with limited permissions. For more information, see IAM Best Practices and Creating an Admin User and Group in the IAM User Guide.
IAM user – An IAM user is simply an identity within your AWS account that has specific custom permissions (for example, permissions to create a web distribution in CloudFront). You can use an IAM user name and password to sign in to secure AWS webpages like the AWS Management Console, AWS Discussion Forums, or the AWS Support Center.
In addition to a user name and password, you can also generate access keys for each user. You can use these keys when you access AWS services programmatically, either through one of the several SDKs or by using the AWS Command Line Interface (CLI). The SDK and CLI tools use the access keys to cryptographically sign your request. If you don’t use the AWS tools, you must sign the request yourself. CloudFront supports Signature Version 4, a protocol for authenticating inbound API requests. For more information about authenticating requests, see Signature Version 4 Signing Process in the AWS General Reference.
IAM role – An IAM role is another IAM identity you can create in your account that has specific permissions. It is similar to an IAM user, but it is not associated with a specific person. An IAM role enables you to obtain temporary access keys that can be used to access AWS services and resources. IAM roles with temporary credentials are useful in the following situations:
Federated user access – Instead of creating an IAM user, you can use preexisting user identities from AWS Directory Service, your enterprise user directory, or a web identity provider. These are known as federated users. AWS assigns a role to a federated user when access is requested through an identity provider. For more information about federated users, see Federated Users and Roles in the IAM User Guide.
Cross-account access – You can use an IAM role in your account to grant another AWS account permissions to access your account’s resources. For an example, see Tutorial: Delegate Access Across AWS Accounts Using IAM Roles in the IAM User Guide.
AWS service access – You can use an IAM role in your account to grant an AWS service permissions to access your account’s resources. For example, you can create a role that allows Amazon Redshift to access an Amazon S3 bucket on your behalf and then load data stored in the bucket into an Amazon Redshift cluster. For more information, see Creating a Role to Delegate Permissions to an AWS Service in the IAM User Guide.
Applications running on Amazon EC2 – Instead of storing access keys within the EC2 instance for use by applications running on the instance and making AWS API requests, you can use an IAM role to manage temporary credentials for these applications. To assign an AWS role to an EC2 instance and make it available to all of its applications, you can create an instance profile that is attached to the instance. An instance profile contains the role and enables programs running on the EC2 instance to get temporary credentials. For more information, see Using Roles for Applications on Amazon EC2 in the IAM User Guide.
To create, update, delete, or list CloudFront resources, you need permissions to perform the operation, and you need permissions to access the corresponding resources. In addition, to perform the operation programmatically, you need valid access keys.
The following sections describe how to manage permissions for CloudFront: