How Amazon Textract Works with IAM

Before you use IAM to manage access to Amazon Textract, you should understand what IAM features are available to use with Amazon Textract. To get a high-level view of how Amazon Textract and other AWS services work with IAM, see AWS Services That Work with IAM in the IAM User Guide.

Amazon Textract Identity-Based Policies

With IAM identity-based policies, you can specify allowed or denied actions and resources and the conditions under which actions are allowed or denied. Amazon Textract supports specific actions, resources, and condition keys. To learn about all of the elements that you use in a JSON policy, see IAM JSON Policy Elements Reference in the IAM User Guide.

Actions

Administrators can use AWS JSON policies to specify who has access to what. That is, which principal can perform actions on what resources, and under what conditions.

The Action element of a JSON policy describes the actions that you can use to allow or deny access in a policy. Policy actions usually have the same name as the associated AWS API operation. There are some exceptions, such as permission-only actions that don't have a matching API operation. There are also some operations that require multiple actions in a policy. These additional actions are called dependent actions.

Include actions in a policy to grant permissions to perform the associated operation.

Asynchronous actions in Amazon Textract require two action permissions to be given, one for Start actions and one for Get actions. Additionally, if you are using an Amazon S3 bucket to pass documents, you will need to grant your account read access.

In Amazon Textract, all policy actions start with: textract:. For example, to grant someone permission to run an Amazon Textract operation with the Amazon Textract AnalyzeDocument operation, you include the textract:AnalyzeDocument action in their policy. Policy statements must include either an Action or NotAction element. Amazon Textract defines its own set of actions that describe tasks that you can perform with this service.

To specify multiple actions in a single statement, separate them with commas as follows.

"Action": [
      "textract:action1",
      "textract:action2"

You can specify multiple actions using wildcards (*). For example, to specify all actions that begin with the word Describe, include the following action.

"Action": "textract:Describe*"

For a list of Amazon Textract actions, see Actions Defined by Amazon Textract in the IAM User Guide.

Resources

Administrators can use AWS JSON policies to specify who has access to what. That is, which principal can perform actions on what resources, and under what conditions.

The Resource JSON policy element specifies the object or objects to which the action applies. Statements must include either a Resource or a NotResource element. As a best practice, specify a resource using its Amazon Resource Name (ARN). You can do this for actions that support a specific resource type, known as resource-level permissions.

For actions that don't support resource-level permissions, such as listing operations, use a wildcard (*) to indicate that the statement applies to all resources.

"Resource": "*"

For actions that supports resource-level permission, such as the AnalyzeDocument and GetAdapteroperations, use the ARN to indicate the resources:

"Resource": [
  # Adapter ARN
  "arn:aws:textract:<region>:<account-id>:/adapters/<adapter-id>",
  # Adapter version ARN
  "arn:aws:textract:<region>:<account-id>:/adapters/<adapter-id>/versions/<version>",
  # Use wildcard to indicate all versions under an adapter
  "arn:aws:textract:<region>:<account-id>:/adapters/<adapter-id>/versions/*"
]    

Condition Keys

Administrators can use AWS JSON policies to specify who has access to what. That is, which principal can perform actions on what resources, and under what conditions.

The Condition element (or Condition block) lets you specify conditions in which a statement is in effect. The Condition element is optional. You can create conditional expressions that use condition operators, such as equals or less than, to match the condition in the policy with values in the request.

If you specify multiple Condition elements in a statement, or multiple keys in a single Condition element, AWS evaluates them using a logical AND operation. If you specify multiple values for a single condition key, AWS evaluates the condition using a logical OR operation. All of the conditions must be met before the statement's permissions are granted.

You can also use placeholder variables when you specify conditions. For example, you can grant an IAM user permission to access a resource only if it is tagged with their IAM user name. For more information, see IAM policy elements: variables and tags in the IAM User Guide.

AWS supports global condition keys and service-specific condition keys. To see all AWS global condition keys, see AWS global condition context keys in the IAM User Guide.

Amazon Textract does not provide any service-specific condition keys, but it does support using some global condition keys. For a list of all AWS global condition keys, see AWS Global Condition Context Keys in the IAM User Guide.

Examples

To view examples of Amazon Textract identity-based policies, see Amazon Textract Identity-Based Policy Examples.

Amazon Textract Resource-Based Policies

Amazon Textract does not support resource-based policies.

Authorization Based on Amazon Textract Tags

Amazon Textract resources supports tagging resources and controlling access based on tags. You can use the TagResource, UntagResource, and ListTagsForResource operations to manage resource tags.

For access control based on tags, you can refer to AccessTags.

Amazon Textract IAM Roles

An IAM role is an entity within your AWS account that has specific permissions.

Using Temporary Credentials with Amazon Textract

You can use temporary credentials to sign in with federation, assume an IAM role, or to assume a cross-account role. You obtain temporary security credentials by calling AWS STS API operations such as AssumeRole or GetFederationToken.

Amazon Textract supports using temporary credentials.

Service-Linked Roles

Service-linked roles allow AWS services to access resources in other services to complete an action on your behalf. Service-linked roles appear in your IAM account and are owned by the service. An IAM administrator can view but not edit the permissions for service-linked roles.

Amazon Textract does not support service-linked roles.

Service Roles

This feature allows a service to assume a service role on your behalf. This role allows the service to access resources in other services to complete an action on your behalf. Service roles appear in your IAM account and are owned by the account. This means that an IAM administrator can change the permissions for this role. However, doing so might break the functionality of the service.

Amazon Textract supports service roles.

If you are using a service role, you should ensure that your account is secure by limiting the scope of Amazon Textract access to only the resources that you're using. To do this, attach a trust policy to your IAM service role. For more information, see Cross-service confused deputy prevention.