# Identity and access management for Amazon EBS
AWS Identity and Access Management (IAM) is an AWS service that helps an administrator securely control access to AWS resources. IAM administrators control who can be *authenticated* (signed in) and *authorized* (have permissions) to use Amazon EBS resources. IAM is an AWS service that you can use with no additional charge.
**Topics**
+ [Audience](#security_iam_audience)
+ [Authenticating with identities](#security_iam_authentication)
+ [Managing access using policies](#security_iam_access-manage)
+ [How Amazon EBS works with IAM](security_iam_service-with-iam.md)
+ [Example IAM policies for Amazon EBS](security_iam_id-based-policy-examples.md)
+ [Troubleshoot Amazon EBS authorization issues](security_iam_troubleshoot.md)
## Audience
How you use AWS Identity and Access Management (IAM) differs based on your role:
+ **Service user** - request permissions from your administrator if you cannot access features (see [Troubleshoot Amazon EBS authorization issues](security_iam_troubleshoot.md))
+ **Service administrator** - determine user access and submit permission requests (see [How Amazon EBS works with IAM](security_iam_service-with-iam.md))
+ **IAM administrator** - write policies to manage access (see [Example IAM policies for Amazon EBS](security_iam_id-based-policy-examples.md))
## Authenticating with identities
Authentication is how you sign in to AWS using your identity credentials. You must be authenticated as the AWS account root user, an IAM user, or by assuming an IAM role.
You can sign in as a federated identity using credentials from an identity source like AWS IAM Identity Center (IAM Identity Center), single sign-on authentication, or Google/Facebook credentials. For more information about signing in, see [How to sign in to your AWS account](https://docs.aws.amazon.com/signin/latest/userguide/how-to-sign-in.html) in the *AWS Sign-In User Guide*.
For programmatic access, AWS provides an SDK and CLI to cryptographically sign requests. For more information, see [AWS Signature Version 4 for API requests](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_sigv.html) in the *IAM User Guide*.
### AWS account root user
When you create an AWS account, you begin with one sign-in identity called the AWS account *root user* that has complete access to all AWS services and resources. We strongly recommend that you don't use the root user for everyday tasks. For tasks that require root user credentials, see [Tasks that require root user credentials](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_root-user.html#root-user-tasks) in the *IAM User Guide*.
### Federated identity
As a best practice, require human users to use federation with an identity provider to access AWS services using temporary credentials.
A *federated identity* is a user from your enterprise directory, web identity provider, or Directory Service that accesses AWS services using credentials from an identity source. Federated identities assume roles that provide temporary credentials.
For centralized access management, we recommend AWS IAM Identity Center. For more information, see [What is IAM Identity Center?](https://docs.aws.amazon.com/singlesignon/latest/userguide/what-is.html) in the *AWS IAM Identity Center User Guide*.
### IAM users and groups
An *[IAM user](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users.html)* is an identity with specific permissions for a single person or application. We recommend using temporary credentials instead of IAM users with long-term credentials. For more information, see [Require human users to use federation with an identity provider to access AWS using temporary credentials](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#bp-users-federation-idp) in the *IAM User Guide*.
An [https://docs.aws.amazon.com/IAM/latest/UserGuide/id_groups.html](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_groups.html) specifies a collection of IAM users and makes permissions easier to manage for large sets of users. For more information, see [Use cases for IAM users](https://docs.aws.amazon.com/IAM/latest/UserGuide/gs-identities-iam-users.html) in the *IAM User Guide*.
### IAM roles
An *[IAM role](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles.html)* is an identity with specific permissions that provides temporary credentials. You can assume a role by [switching from a user to an IAM role (console)](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use_switch-role-console.html) or by calling an AWS CLI or AWS API operation. For more information, see [Methods to assume a role](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_manage-assume.html) in the *IAM User Guide*.
IAM roles are useful for federated user access, temporary IAM user permissions, cross-account access, cross-service access, and applications running on Amazon EC2. For more information, see [Cross account resource access in IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies-cross-account-resource-access.html) in the *IAM User Guide*.
## Managing access using policies
You control access in AWS by creating policies and attaching them to AWS identities or resources. A policy defines permissions when associated with an identity or resource. AWS evaluates these policies when a principal makes a request. Most policies are stored in AWS as JSON documents. For more information about JSON policy documents, see [Overview of JSON policies](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies.html#access_policies-json) in the *IAM User Guide*.
Using policies, administrators specify who has access to what by defining which **principal** can perform **actions** on what **resources**, and under what **conditions**.
By default, users and roles have no permissions. An IAM administrator creates IAM policies and adds them to roles, which users can then assume. IAM policies define permissions regardless of the method used to perform the operation.
### Identity-based policies
Identity-based policies are JSON permissions policy documents that you attach to an identity (user, group, or role). These policies control what actions identities can perform, on which resources, and under what conditions. To learn how to create an identity-based policy, see [Define custom IAM permissions with customer managed policies](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_create.html) in the *IAM User Guide*.
Identity-based policies can be *inline policies* (embedded directly into a single identity) or *managed policies* (standalone policies attached to multiple identities). To learn how to choose between managed and inline policies, see [Choose between managed policies and inline policies](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies-choosing-managed-or-inline.html) in the *IAM User Guide*.
### Resource-based policies
Resource-based policies are JSON policy documents that you attach to a resource. Examples include IAM *role trust policies* and Amazon S3 *bucket policies*. In services that support resource-based policies, service administrators can use them to control access to a specific resource. You must [specify a principal](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_principal.html) in a resource-based policy.
Resource-based policies are inline policies that are located in that service. You can't use AWS managed policies from IAM in a resource-based policy.
### Other policy types
AWS supports additional policy types that can set the maximum permissions granted by more common policy types:
+ **Permissions boundaries** – Set the maximum permissions that an identity-based policy can grant to an IAM entity. For more information, see [Permissions boundaries for IAM entities](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_boundaries.html) in the *IAM User Guide*.
+ **Service control policies (SCPs)** – Specify the maximum permissions for an organization or organizational unit in AWS Organizations. For more information, see [Service control policies](https://docs.aws.amazon.com/organizations/latest/userguide/orgs_manage_policies_scps.html) in the *AWS Organizations User Guide*.
+ **Resource control policies (RCPs)** – Set the maximum available permissions for resources in your accounts. For more information, see [Resource control policies (RCPs)](https://docs.aws.amazon.com/organizations/latest/userguide/orgs_manage_policies_rcps.html) in the *AWS Organizations User Guide*.
+ **Session policies** – Advanced policies passed as a parameter when creating a temporary session for a role or federated user. For more information, see [Session policies](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies.html#policies_session) in the *IAM User Guide*.
### Multiple policy types
When multiple types of policies apply to a request, the resulting permissions are more complicated to understand. To learn how AWS determines whether to allow a request when multiple policy types are involved, see [Policy evaluation logic](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_evaluation-logic.html) in the *IAM User Guide*.
# How Amazon EBS works with IAM
Before you use IAM to manage access to Amazon EBS, learn what IAM features are available to use with Amazon EBS.
**IAM features you can use with Amazon Elastic Block Store**
| IAM feature | Amazon EBS support |
| --- | --- |
| [Identity-based policies](#security_iam_service-with-iam-id-based-policies) | Yes |
| [Resource-based policies](#security_iam_service-with-iam-resource-based-policies) | No |
| [Policy actions](#security_iam_service-with-iam-id-based-policies-actions) | Yes |
| [Policy resources](#security_iam_service-with-iam-id-based-policies-resources) | Yes |
| [Policy condition keys](#security_iam_service-with-iam-id-based-policies-conditionkeys) | Yes |
| [ACLs](#security_iam_service-with-iam-acls) | No |
| [ABAC (tags in policies)](#security_iam_service-with-iam-tags) | Partial |
| [Temporary credentials](#security_iam_service-with-iam-roles-tempcreds) | Yes |
| [Principal permissions](#security_iam_service-with-iam-principal-permissions) | Yes |
| [Service roles](#security_iam_service-with-iam-roles-service) | Yes |
| [Service-linked roles](#security_iam_service-with-iam-roles-service-linked) | No |
To get a high-level view of how Amazon EBS and other AWS services work with most IAM features, see [AWS services that work with IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html) in the *IAM User Guide*.
## Identity-based policies for Amazon EBS
**Supports identity-based policies:** Yes
Identity-based policies are JSON permissions policy documents that you can attach to an identity, such as an IAM user, group of users, or role. These policies control what actions users and roles can perform, on which resources, and under what conditions. To learn how to create an identity-based policy, see [Define custom IAM permissions with customer managed policies](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_create.html) in the *IAM User Guide*.
With IAM identity-based policies, you can specify allowed or denied actions and resources as well as the conditions under which actions are allowed or denied. To learn about all of the elements that you can use in a JSON policy, see [IAM JSON policy elements reference](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements.html) in the *IAM User Guide*.
### Identity-based policy examples for Amazon EBS
To view examples of Amazon EBS identity-based policies, see [Example IAM policies for Amazon EBS](security_iam_id-based-policy-examples.md).
## Resource-based policies within Amazon EBS
**Supports resource-based policies:** No
Resource-based policies are JSON policy documents that you attach to a resource. Examples of resource-based policies are IAM *role trust policies* and Amazon S3 *bucket policies*. In services that support resource-based policies, service administrators can use them to control access to a specific resource. For the resource where the policy is attached, the policy defines what actions a specified principal can perform on that resource and under what conditions. You must [specify a principal](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_principal.html) in a resource-based policy. Principals can include accounts, users, roles, federated users, or AWS services.
To enable cross-account access, you can specify an entire account or IAM entities in another account as the principal in a resource-based policy. For more information, see [Cross account resource access in IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies-cross-account-resource-access.html) in the *IAM User Guide*.
## Policy actions for Amazon EBS
**Supports policy actions:** Yes
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. Include actions in a policy to grant permissions to perform the associated operation.
To see a list of Amazon EBS actions, see [ Actions, resources, and condition keys for Amazon EC2](https://docs.aws.amazon.com/service-authorization/latest/reference/list_amazonec2.html) and [ Actions, resources, and condition keys for Amazon EBS](https://docs.aws.amazon.com/service-authorization/latest/reference/list_amazonelasticblockstore.html) in the *Service Authorization Reference*.
Policy actions in Amazon EBS use either the `ec2` or the `ebs` prefix before the action.
To specify multiple actions in a single statement, separate them with commas.
```
"Action": [
"ec2:action1",
"ec2:action2"
]
```
To view examples of Amazon EBS identity-based policies, see [Example IAM policies for Amazon EBS](security_iam_id-based-policy-examples.md).
## Policy resources for Amazon EBS
**Supports policy resources:** Yes
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. As a best practice, specify a resource using its [Amazon Resource Name (ARN)](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference-arns.html). For actions that don't support resource-level permissions, use a wildcard (\$1) to indicate that the statement applies to all resources.
```
"Resource": "*"
```
Some Amazon EBS API actions support multiple resources. To specify multiple resources in a single statement, separate the ARNs with commas. For example, `DescribeVolumes` accesses vol-01234567890abcdef and vol-09876543210fedcba, so a principal must have permissions to access both resources.
```
"Resource": [
"arn:aws:ec2:us-east-1:123456789012:volume/vol-01234567890abcdef",
"arn:aws:ec2:us-east-1:123456789012:volume/vol-09876543210fedcba"
]
```
## Policy condition keys for Amazon EBS
**Supports service-specific policy condition keys:** Yes
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 specifies when statements execute based on defined criteria. You can create conditional expressions that use [condition operators](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_condition_operators.html), such as equals or less than, to match the condition in the policy with values in the request. To see all AWS global condition keys, see [AWS global condition context keys](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_condition-keys.html) in the *IAM User Guide*.
For example, the following condition allows the principal to perform an action on a volume only if the volume type is `gp2`.
```
"Condition":{
"StringLikeIfExists":{
"ec2:VolumeType":"gp2"
}
}
```
To see a list of Amazon EBS condition keys, see [ Actions, resources, and condition keys](https://docs.aws.amazon.com/service-authorization/latest/reference/list_amazonec2.html#amazonec2-policy-keys) in the *Service Authorization Reference*.
## ACLs in Amazon EBS
**Supports ACLs:** No
Access control lists (ACLs) control which principals (account members, users, or roles) have permissions to access a resource. ACLs are similar to resource-based policies, although they do not use the JSON policy document format.
## ABAC with Amazon EBS
**Supports ABAC (tags in policies):** Partial
Attribute-based access control (ABAC) is an authorization strategy that defines permissions based on attributes called tags. You can attach tags to IAM entities and AWS resources, then design ABAC policies to allow operations when the principal's tag matches the tag on the resource.
To control access based on tags, you provide tag information in the [condition element](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_condition.html) of a policy using the `aws:ResourceTag/key-name`, `aws:RequestTag/key-name`, or `aws:TagKeys` condition keys.
If a service supports all three condition keys for every resource type, then the value is **Yes** for the service. If a service supports all three condition keys for only some resource types, then the value is **Partial**.
For more information about ABAC, see [Define permissions with ABAC authorization](https://docs.aws.amazon.com/IAM/latest/UserGuide/introduction_attribute-based-access-control.html) in the *IAM User Guide*. To view a tutorial with steps for setting up ABAC, see [Use attribute-based access control (ABAC)](https://docs.aws.amazon.com/IAM/latest/UserGuide/tutorial_attribute-based-access-control.html) in the *IAM User Guide*.
## Using temporary credentials with Amazon EBS
**Supports temporary credentials:** Yes
Temporary credentials provide short-term access to AWS resources and are automatically created when you use federation or switch roles. AWS recommends that you dynamically generate temporary credentials instead of using long-term access keys. For more information, see [Temporary security credentials in IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_temp.html) and [AWS services that work with IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html) in the *IAM User Guide*.
## Cross-service principal permissions for Amazon EBS
**Supports forward access sessions (FAS):** Yes
Forward access sessions (FAS) use the permissions of the principal calling an AWS service, combined with the requesting AWS service to make requests to downstream services. For policy details when making FAS requests, see [Forward access sessions](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_forward_access_sessions.html).
## Service roles for Amazon EBS
**Supports service roles:** Yes
A service role is an [IAM role](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles.html) that a service assumes to perform actions on your behalf. An IAM administrator can create, modify, and delete a service role from within IAM. For more information, see [Create a role to delegate permissions to an AWS service](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_create_for-service.html) in the *IAM User Guide*.
**Warning**
Changing the permissions for a service role might break Amazon EBS functionality. Edit service roles only when Amazon EBS provides guidance to do so.
## Service-linked roles for Amazon EBS
**Supports service-linked roles:** No
A service-linked role is a type of service role that is linked to an AWS service. The service can assume the role to perform an action on your behalf. Service-linked roles appear in your AWS account and are owned by the service. An IAM administrator can view, but not edit the permissions for service-linked roles.
For details about creating or managing service-linked roles, see [AWS services that work with IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html). Find a service in the table that includes a `Yes` in the **Service-linked role** column. Choose the **Yes** link to view the service-linked role documentation for that service.
# Example IAM policies for Amazon EBS
By default, users and roles don't have permission to create or modify Amazon EBS resources. They also can't perform tasks by using the AWS Management Console, AWS Command Line Interface (AWS CLI), or AWS API. To grant users permission to perform actions on the resources that they need, an IAM administrator can create IAM policies. The administrator can then add the IAM policies to roles, and users can assume the roles.
To learn how to create an IAM identity-based policy by using these example JSON policy documents, see [Creating IAM policies](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_create-console.html) in the *IAM User Guide*.
**Topics**
+ [Policy best practices](#security_iam_service-with-iam-policy-best-practices)
+ [Allow users to use the Amazon EBS console](#security_iam_id-based-policy-examples-console)
+ [Allow users to view their own permissions](#security_iam_id-based-policy-examples-view-own-permissions)
+ [Allow users to work with volumes](#iam-example-manage-volumes)
+ [Allow users to work with snapshots](#iam-example-manage-snapshots)
## Policy best practices
Identity-based policies determine whether someone can create, access, or delete Amazon EBS resources in your account. These actions can incur costs for your AWS account. When you create or edit identity-based policies, follow these guidelines and recommendations:
+ **Get started with AWS managed policies and move toward least-privilege permissions** – To get started granting permissions to your users and workloads, use the *AWS managed policies* that grant permissions for many common use cases. They are available in your AWS account. We recommend that you reduce permissions further by defining AWS customer managed policies that are specific to your use cases. For more information, see [AWS managed policies](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_managed-vs-inline.html#aws-managed-policies) or [AWS managed policies for job functions](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_job-functions.html) in the *IAM User Guide*.
+ **Apply least-privilege permissions** – When you set permissions with IAM policies, grant only the permissions required to perform a task. You do this by defining the actions that can be taken on specific resources under specific conditions, also known as *least-privilege permissions*. For more information about using IAM to apply permissions, see [ Policies and permissions in IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies.html) in the *IAM User Guide*.
+ **Use conditions in IAM policies to further restrict access** – You can add a condition to your policies to limit access to actions and resources. For example, you can write a policy condition to specify that all requests must be sent using SSL. You can also use conditions to grant access to service actions if they are used through a specific AWS service, such as CloudFormation. For more information, see [ IAM JSON policy elements: Condition](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_condition.html) in the *IAM User Guide*.
+ **Use IAM Access Analyzer to validate your IAM policies to ensure secure and functional permissions** – IAM Access Analyzer validates new and existing policies so that the policies adhere to the IAM policy language (JSON) and IAM best practices. IAM Access Analyzer provides more than 100 policy checks and actionable recommendations to help you author secure and functional policies. For more information, see [Validate policies with IAM Access Analyzer](https://docs.aws.amazon.com/IAM/latest/UserGuide/access-analyzer-policy-validation.html) in the *IAM User Guide*.
+ **Require multi-factor authentication (MFA)** – If you have a scenario that requires IAM users or a root user in your AWS account, turn on MFA for additional security. To require MFA when API operations are called, add MFA conditions to your policies. For more information, see [ Secure API access with MFA](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_mfa_configure-api-require.html) in the *IAM User Guide*.
For more information about best practices in IAM, see [Security best practices in IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html) in the *IAM User Guide*.
## Allow users to use the Amazon EBS console
To access the Amazon Elastic Block Store console, you must have a minimum set of permissions. These permissions must allow you to list and view details about the Amazon EBS resources in your AWS account. If you create an identity-based policy that is more restrictive than the minimum required permissions, the console won't function as intended for entities (users or roles) with that policy.
You don't need to allow minimum console permissions for users that are making calls only to the AWS CLI or the AWS API. Instead, allow access to only the actions that match the API operation that they're trying to perform.
To ensure that users and roles can still use the Amazon EBS console, also attach the Amazon EBS `ConsoleAccess` or `ReadOnly` AWS managed policy to the entities. For more information, see [Adding permissions to a user](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users_change-permissions.html#users_change_permissions-add-console) in the *IAM User Guide*.
## Allow users to view their own permissions
This example shows how you might create a policy that allows IAM users to view the inline and managed policies that are attached to their user identity. This policy includes permissions to complete this action on the console or programmatically using the AWS CLI or AWS API.
```
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "ViewOwnUserInfo",
"Effect": "Allow",
"Action": [
"iam:GetUserPolicy",
"iam:ListGroupsForUser",
"iam:ListAttachedUserPolicies",
"iam:ListUserPolicies",
"iam:GetUser"
],
"Resource": ["arn:aws:iam::*:user/${aws:username}"]
},
{
"Sid": "NavigateInConsole",
"Effect": "Allow",
"Action": [
"iam:GetGroupPolicy",
"iam:GetPolicyVersion",
"iam:GetPolicy",
"iam:ListAttachedGroupPolicies",
"iam:ListGroupPolicies",
"iam:ListPolicyVersions",
"iam:ListPolicies",
"iam:ListUsers"
],
"Resource": "*"
}
]
}
```
## Allow users to work with volumes
**Topics**
+ [Example: Attach and detach volumes](#iam-example-manage-volumes-attach-detach)
+ [Example: Create a volume](#iam-example-manage-volumes-create)
+ [Example: Create a volume with tags](#iam-example-manage-volumes-tags)
+ [Example: Work with volumes using the Amazon EC2 console](#ex-volumes)
### Example: Attach and detach volumes
When an API action requires a caller to specify multiple resources, you must create a policy statement that allows users to access all required resources. If you need to use a `Condition` element with one or more of these resources, you must create multiple statements as shown in this example.
The following policy allows users to attach volumes with the tag "`volume_user`=*iam-user-name*" to instances with the tag "`department=dev`", and to detach those volumes from those instances. If you attach this policy to an IAM group, the `aws:username` policy variable gives each user in the group permission to attach or detach volumes from the instances with a tag named `volume_user` that has their username as a value.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"ec2:AttachVolume",
"ec2:DetachVolume"
],
"Resource": "arn:aws:ec2:us-east-1:111122223333:instance/*",
"Condition": {
"StringEquals": {
"aws:ResourceTag/department": "dev"
}
}
},
{
"Effect": "Allow",
"Action": [
"ec2:AttachVolume",
"ec2:DetachVolume"
],
"Resource": "arn:aws:ec2:us-east-1:111122223333:volume/*",
"Condition": {
"StringEquals": {
"aws:ResourceTag/volume_user": "${aws:username}"
}
}
}
]
}
```
------
### Example: Create a volume
The following policy allows users to use the [CreateVolume](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateVolume.html) API action. The user is allowed to create a volume only if the volume is encrypted and only if the volume size is less than 20 GiB.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"ec2:CreateVolume"
],
"Resource": "arn:aws:ec2:us-east-1:111122223333:volume/*",
"Condition": {
"NumericLessThan": {
"ec2:VolumeSize": "20"
},
"Bool": {
"ec2:Encrypted": "true"
}
}
}
]
}
```
------
### Example: Create a volume with tags
The following policy includes the `aws:RequestTag` condition key that requires users to tag any volumes they create with the tags `costcenter=115` and `stack=prod`. If users don't pass these specific tags, or if they don't specify tags at all, the request fails.
For resource-creating actions that apply tags, users must also have permissions to use the `CreateTags` action. The second statement uses the `ec2:CreateAction` condition key to allow users to create tags only in the context of `CreateVolume`. Users cannot tag existing volumes or any other resources.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Sid": "AllowCreateTaggedVolumes",
"Effect": "Allow",
"Action": "ec2:CreateVolume",
"Resource": "arn:aws:ec2:us-east-1:111122223333:volume/*",
"Condition": {
"StringEquals": {
"aws:RequestTag/costcenter": "115",
"aws:RequestTag/stack": "prod"
}
}
},
{
"Effect": "Allow",
"Action": [
"ec2:CreateTags"
],
"Resource": "arn:aws:ec2:us-east-1:111122223333:volume/*",
"Condition": {
"StringEquals": {
"ec2:CreateAction": "CreateVolume"
}
}
}
]
}
```
------
The following policy allows users to create a volume without having to specify tags. The `CreateTags` action is only evaluated if tags are specified in the `CreateVolume` request. If users do specify tags, the tag must be `purpose=test`. No other tags are allowed in the request.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": "ec2:CreateVolume",
"Resource": "*"
},
{
"Effect": "Allow",
"Action": [
"ec2:CreateTags"
],
"Resource": "arn:aws:ec2:us-east-1:111122223333:volume/*",
"Condition": {
"StringEquals": {
"aws:RequestTag/purpose": "test",
"ec2:CreateAction": "CreateVolume"
},
"ForAllValues:StringEquals": {
"aws:TagKeys": "purpose"
}
}
}
]
}
```
------
### Example: Work with volumes using the Amazon EC2 console
The following policy grants users permission to view and create volumes, and attach and detach volumes to specific instances using the Amazon EC2 console.
Users can attach any volume to instances that have the tag "`purpose=test`", and also detach volumes from those instances. To attach a volume using the Amazon EC2 console, it is helpful for users to have permission to use the `ec2:DescribeInstances` action, as this allows them to select an instance from a pre-populated list in the **Attach Volume** dialog box. However, this also allows users to view all instances on the **Instances** page in the console, so you can omit this action.
In the first statement, the `ec2:DescribeAvailabilityZones` action is necessary to ensure that a user can select an Availability Zone when creating a volume.
Users cannot tag the volumes that they create (either during or after volume creation).
## Allow users to work with snapshots
The following are example policies for both `CreateSnapshot` (point-in-time snapshot of an EBS volume) and `CreateSnapshots` (multi-volume snapshots).
**Topics**
+ [Example: Create a snapshot](#iam-creating-snapshot)
+ [Example: Create snapshots](#iam-creating-snapshots)
+ [Example: Create a snapshot with tags](#iam-creating-snapshot-with-tags)
+ [Example: Create multi-volume snapshots with tags](#iam-creating-snapshots-with-tags)
+ [Example: Copying snapshots](#iam-copy-snapshot)
+ [Example: Modify permission settings for snapshots](#iam-modifying-snapshot-with-tags)
### Example: Create a snapshot
The following policy allows customers to use the [CreateSnapshot](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateSnapshot.html) API action. The customer can create snapshots only if the volume is encrypted and only if the volume size is less than 20 GiB.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": "ec2:CreateSnapshot",
"Resource": "arn:aws:ec2:us-east-1::snapshot/*"
},
{
"Effect": "Allow",
"Action": "ec2:CreateSnapshot",
"Resource": "arn:aws:ec2:us-east-1:111122223333:volume/*",
"Condition": {
"NumericLessThan": {
"ec2:VolumeSize": "20"
},
"Bool": {
"ec2:Encrypted": "true"
}
}
}
]
}
```
------
### Example: Create snapshots
The following policy allows customers to use the [CreateSnapshots](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateSnapshots.html) API action. The customer can create snapshots only if all of the volumes on the instance are type GP2.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect":"Allow",
"Action":"ec2:CreateSnapshots",
"Resource":[
"arn:aws:ec2:us-east-1::snapshot/*",
"arn:aws:ec2:*:*:instance/*"
]
},
{
"Effect":"Allow",
"Action":"ec2:CreateSnapshots",
"Resource":"arn:aws:ec2:us-east-1:*:volume/*",
"Condition":{
"StringLikeIfExists":{
"ec2:VolumeType":"gp2"
}
}
}
]
}
```
------
### Example: Create a snapshot with tags
The following policy includes the `aws:RequestTag` condition key that requires the customer to apply the tags `costcenter=115` and `stack=prod` to any new snapshot. If users don't pass these specific tags, or if they don't specify tags at all, the request fails.
For resource-creating actions that apply tags, customers must also have permissions to use the `CreateTags` action. The third statement uses the `ec2:CreateAction` condition key to allow customers to create tags only in the context of `CreateSnapshot`. Customers cannot tag existing volumes or any other resources.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": "ec2:CreateSnapshot",
"Resource": "arn:aws:ec2:us-east-1:111122223333:volume/*"
},
{
"Sid": "AllowCreateTaggedSnapshots",
"Effect": "Allow",
"Action": "ec2:CreateSnapshot",
"Resource": "arn:aws:ec2:us-east-1::snapshot/*",
"Condition": {
"StringEquals": {
"aws:RequestTag/costcenter": "115",
"aws:RequestTag/stack": "prod"
}
}
},
{
"Effect": "Allow",
"Action": "ec2:CreateTags",
"Resource": "arn:aws:ec2:us-east-1::snapshot/*",
"Condition": {
"StringEquals": {
"ec2:CreateAction": "CreateSnapshot"
}
}
}
]
}
```
------
### Example: Create multi-volume snapshots with tags
The following policy includes the `aws:RequestTag` condition key that requires the customer to apply the tags `costcenter=115` and `stack=prod` when creating a multi-volume snapshot set. If users don't pass these specific tags, or if they don't specify tags at all, the request fails.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect":"Allow",
"Action":"ec2:CreateSnapshots",
"Resource":[
"arn:aws:ec2:us-east-1::snapshot/*",
"arn:aws:ec2:*:*:instance/*",
"arn:aws:ec2:*:*:volume/*"
]
},
{
"Sid":"AllowCreateTaggedSnapshots",
"Effect":"Allow",
"Action":"ec2:CreateSnapshots",
"Resource":"arn:aws:ec2:us-east-1::snapshot/*",
"Condition":{
"StringEquals":{
"aws:RequestTag/costcenter":"115",
"aws:RequestTag/stack":"prod"
}
}
},
{
"Effect":"Allow",
"Action":"ec2:CreateTags",
"Resource":"arn:aws:ec2:us-east-1::snapshot/*",
"Condition":{
"StringEquals":{
"ec2:CreateAction":"CreateSnapshots"
}
}
}
]
}
```
------
The following policy allows customers to create a snapshot without having to specify tags. The `CreateTags` action is evaluated only if tags are specified in the `CreateSnapshot` or `CreateSnapshots` request. Tags can be omitted in the request. If a tag is specified, the tag must be `purpose=test`. No other tags are allowed in the request.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect":"Allow",
"Action":"ec2:CreateSnapshot",
"Resource":"*"
},
{
"Effect":"Allow",
"Action":"ec2:CreateTags",
"Resource":"arn:aws:ec2:us-east-1::snapshot/*",
"Condition":{
"StringEquals":{
"aws:RequestTag/purpose":"test",
"ec2:CreateAction":"CreateSnapshot"
},
"ForAllValues:StringEquals":{
"aws:TagKeys":"purpose"
}
}
}
]
}
```
------
The following policy allows customers to create multi-volume snapshot sets without having to specify tags. The `CreateTags` action is evaluated only if tags are specified in the `CreateSnapshot` or `CreateSnapshots` request. Tags can be omitted in the request. If a tag is specified, the tag must be `purpose=test`. No other tags are allowed in the request.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect":"Allow",
"Action":"ec2:CreateSnapshots",
"Resource":"*"
},
{
"Effect":"Allow",
"Action":"ec2:CreateTags",
"Resource":"arn:aws:ec2:us-east-1::snapshot/*",
"Condition":{
"StringEquals":{
"aws:RequestTag/purpose":"test",
"ec2:CreateAction":"CreateSnapshots"
},
"ForAllValues:StringEquals":{
"aws:TagKeys":"purpose"
}
}
}
]
}
```
------
The following policy allows snapshots to be created only if the source volume is tagged with `User:username` for the customer, and the snapshot itself is tagged with `Environment:Dev` and `User:username`. The customer can add additional tags to the snapshot.
The following policy for `CreateSnapshots` allows snapshots to be created only if the source volume is tagged with `User:username` for the customer, and the snapshot itself is tagged with `Environment:Dev` and `User:username`.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": "ec2:CreateSnapshots",
"Resource": "arn:aws:ec2:us-east-1:*:instance/*"
},
{
"Effect": "Allow",
"Action": "ec2:CreateSnapshots",
"Resource": "arn:aws:ec2:us-east-1:111122223333:volume/*",
"Condition": {
"StringEquals": {
"aws:ResourceTag/User": "${aws:username}"
}
}
},
{
"Effect": "Allow",
"Action": "ec2:CreateSnapshots",
"Resource": "arn:aws:ec2:us-east-1::snapshot/*",
"Condition": {
"StringEquals": {
"aws:RequestTag/Environment": "Dev",
"aws:RequestTag/User": "${aws:username}"
}
}
},
{
"Effect": "Allow",
"Action": "ec2:CreateTags",
"Resource": "arn:aws:ec2:us-east-1::snapshot/*"
}
]
}
```
------
The following policy allows deletion of a snapshot only if the snapshot is tagged with User:*username* for the customer.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect":"Allow",
"Action":"ec2:DeleteSnapshot",
"Resource":"arn:aws:ec2:us-east-1::snapshot/*",
"Condition":{
"StringEquals":{
"aws:ResourceTag/User":"${aws:username}"
}
}
}
]
}
```
------
The following policy allows a customer to create a snapshot but denies the action if the snapshot being created has a tag key `value=stack`.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect":"Allow",
"Action":[
"ec2:CreateSnapshot",
"ec2:CreateTags"
],
"Resource":"*"
},
{
"Effect":"Deny",
"Action":"ec2:CreateSnapshot",
"Resource":"arn:aws:ec2:us-east-1::snapshot/*",
"Condition":{
"ForAnyValue:StringEquals":{
"aws:TagKeys":"stack"
}
}
}
]
}
```
------
The following policy allows a customer to create snapshots but denies the action if the snapshots being created have a tag key `value=stack`.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect":"Allow",
"Action":[
"ec2:CreateSnapshots",
"ec2:CreateTags"
],
"Resource":"*"
},
{
"Effect":"Deny",
"Action":"ec2:CreateSnapshots",
"Resource":"arn:aws:ec2:us-east-1::snapshot/*",
"Condition":{
"ForAnyValue:StringEquals":{
"aws:TagKeys":"stack"
}
}
}
]
}
```
------
The following policy allows you to combine multiple actions into a single policy. You can only create a snapshot (in the context of `CreateSnapshots`) when the snapshot is created in Region `us-east-1`. You can only create snapshots (in the context of `CreateSnapshots`) when the snapshots are being created in the Region `us-east-1` and when the instance type is `t2*`.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect":"Allow",
"Action":[
"ec2:CreateSnapshots",
"ec2:CreateSnapshot",
"ec2:CreateTags"
],
"Resource": [
"arn:aws:ec2:*:*:instance/*",
"arn:aws:ec2:*:*:snapshot/*",
"arn:aws:ec2:*:*:volume/*"
],
"Condition":{
"StringEqualsIgnoreCase": {
"ec2:Region": "us-east-1"
},
"StringLikeIfExists": {
"ec2:InstanceType": ["t2.*"]
}
}
}
]
}
```
------
### Example: Copying snapshots
Resource-level permissions specified for the **CopySnapshot** action apply to both the new snapshot and the source snapshot.
The following example policy allows principals to copy snapshots only if the new snapshot is created with tag key of `purpose` and a tag value of `production`(`purpose=production`).
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Sid": "AllowCopySnapshotWithTags",
"Effect": "Allow",
"Action": "ec2:CopySnapshot",
"Resource": "arn:aws:ec2:*:111122223333:snapshot/*",
"Condition": {
"StringEquals": {
"aws:RequestTag/purpose": "production"
}
}
}
]
}
```
------
The following example policy allows principals to copy snapshots only if the source snapshot is owned by AWS account `123456789012`.
The following example policy allows principals to copy snapshots only if the source snapshot is created with tag key of `CSISnapshotName`.
```
{
"Effect": "Allow",
"Action": "ec2:CopySnapshot",
"Resource": "arn:aws:ec2:*::snapshot/${*}",
"Condition": {
"StringLike": {
"aws:RequestTag/CSISnapshotName": "*"
}
}
},
{
"Effect": "Allow",
"Action": "ec2:CopySnapshot",
"Resource": "arn:aws:ec2:*::snapshot/snap-*"
}
```
### Example: Modify permission settings for snapshots
The following policy allows modification of a snapshot only if the snapshot is tagged with `User:username`, where *username* is the customer's AWS account user name. The request fails if this condition is not met.
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect":"Allow",
"Action":"ec2:ModifySnapshotAttribute",
"Resource":"arn:aws:ec2:us-east-1::snapshot/*",
"Condition":{
"StringEquals":{
"aws:ResourceTag/user-name":"${aws:username}"
}
}
}
]
}
```
------
# Troubleshoot Amazon EBS authorization issues
Use the following information to help you diagnose and fix common issues that you might encounter when working with Amazon EBS and IAM.
**Topics**
+ [I am not authorized to perform an action in Amazon EBS](#security_iam_troubleshoot-no-permissions)
+ [I am not authorized to perform iam:PassRole](#security_iam_troubleshoot-passrole)
+ [I want to allow people outside of my AWS account to access my Amazon EBS resources](#security_iam_troubleshoot-cross-account-access)
## I am not authorized to perform an action in Amazon EBS
If the AWS Management Console tells you that you're not authorized to perform an action, then you must contact your administrator for assistance. Your administrator is the person that provided you with your sign-in credentials.
The following example error occurs when the `mateojackson` IAM user tries to use the console to view details about a volume but does not have `ec2:DescribeVolumes` permissions.
```
User: arn:aws:iam::123456789012:user/mateojackson is not authorized to perform: ec2:DescribeVolumes on resource: volume-id
```
In this case, Mateo asks his AWS administrator to allow him to describe the volume.
## I am not authorized to perform iam:PassRole
If you receive an error that you're not authorized to perform the `iam:PassRole` action, your policies must be updated to allow you to pass a role to Amazon EBS.
Some AWS services allow you to pass an existing role to that service instead of creating a new service role or service-linked role. To do this, you must have permissions to pass the role to the service.
The following example error occurs when an IAM user named `marymajor` tries to use the console to perform an action in Amazon EBS. However, the action requires the service to have permissions that are granted by a service role. Mary does not have permissions to pass the role to the service.
```
User: arn:aws:iam::123456789012:user/marymajor is not authorized to perform: iam:PassRole
```
In this case, Mary's policies must be updated to allow her to perform the `iam:PassRole` action.
If you need help, contact your AWS administrator. Your administrator is the person who provided you with your sign-in credentials.
## I want to allow people outside of my AWS account to access my Amazon EBS resources
You can create a role that users in other accounts or people outside of your organization can use to access your resources. You can specify who is trusted to assume the role. For services that support resource-based policies or access control lists (ACLs), you can use those policies to grant people access to your resources.
To learn more, consult the following:
+ To learn whether Amazon EBS supports these features, see [How Amazon EBS works with IAM](security_iam_service-with-iam.md).
+ To learn how to provide access to your resources across AWS accounts that you own, see [Providing access to an IAM user in another AWS account that you own](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_common-scenarios_aws-accounts.html) in the *IAM User Guide*.
+ To learn how to provide access to your resources to third-party AWS accounts, see [Providing access to AWS accounts owned by third parties](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_common-scenarios_third-party.html) in the *IAM User Guide*.
+ To learn how to provide access through identity federation, see [Providing access to externally authenticated users (identity federation)](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_common-scenarios_federated-users.html) in the *IAM User Guide*.
+ To learn the difference between using roles and resource-based policies for cross-account access, see [Cross account resource access in IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies-cross-account-resource-access.html) in the *IAM User Guide*.