# Identity and access management for Amazon Database Migration Service Amazon Identity and Access Management (IAM) is an Amazon Web Services service that helps an administrator securely control access to Amazon resources. IAM administrators control who can be *authenticated* (signed in) and *authorized* (have permissions) to use Amazon DMS resources. IAM is an Amazon Web Services 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 Database Migration Service works with IAM](security_iam_service-with-iam.md) + [Amazon Database Migration Service identity-based policy examples](security_iam_id-based-policy-examples.md) + [Resource-based policy examples for Amazon KMS](security_iam_resource-based-policy-examples.md) + [Using secrets to access Amazon Database Migration Service endpoints](security_iam_secretsmanager.md) + [Using service-linked roles for Amazon DMS](using-service-linked-roles.md) + [Troubleshooting Amazon Database Migration Service identity and access](security_iam_troubleshoot.md) + [IAM permissions needed to use Amazon DMS](#CHAP_Security.IAMPermissions) + [Creating the IAM roles to use with Amazon DMS](#CHAP_Security.APIRole) + [Cross-service confused deputy prevention](cross-service-confused-deputy-prevention.md) + [Amazon managed policies for Amazon Database Migration Service](security-iam-awsmanpol.md) ## Audience How you use Amazon Identity and Access Management (IAM) differs based on your role: + **Service user** - request permissions from your administrator if you cannot access features (see [Troubleshooting Amazon Database Migration Service identity and access](security_iam_troubleshoot.md)) + **Service administrator** - determine user access and submit permission requests (see [How Amazon Database Migration Service works with IAM](security_iam_service-with-iam.md)) + **IAM administrator** - write policies to manage access (see [Amazon Database Migration Service identity-based policy examples](security_iam_id-based-policy-examples.md)) ## Authenticating with identities Authentication is how you sign in to Amazon using your identity credentials. You must be authenticated as the Amazon Web Services account root user, an IAM user, or by assuming an IAM role. For programmatic access, Amazon provides an SDK and CLI to cryptographically sign requests. For more information, see [Amazon Signature Version 4 for API requests](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference_sigv.html) in the *IAM User Guide*. ### Amazon Web Services account root user When you create an Amazon Web Services account, you begin with one sign-in identity called the Amazon Web Services account *root user* that has complete access to all Amazon Web Services 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.amazonaws.cn/IAM/latest/UserGuide/id_root-user.html#root-user-tasks) in the *IAM User Guide*. ### IAM users and groups An *[IAM user](https://docs.amazonaws.cn/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 Amazon using temporary credentials](https://docs.amazonaws.cn/IAM/latest/UserGuide/best-practices.html#bp-users-federation-idp) in the *IAM User Guide*. An [https://docs.amazonaws.cn/IAM/latest/UserGuide/id_groups.html](https://docs.amazonaws.cn/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.amazonaws.cn/IAM/latest/UserGuide/gs-identities-iam-users.html) in the *IAM User Guide*. ### IAM roles An *[IAM role](https://docs.amazonaws.cn/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.amazonaws.cn/IAM/latest/UserGuide/id_roles_use_switch-role-console.html) or by calling an Amazon CLI or Amazon API operation. For more information, see [Methods to assume a role](https://docs.amazonaws.cn/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.amazonaws.cn/IAM/latest/UserGuide/access_policies-cross-account-resource-access.html) in the *IAM User Guide*. ## Managing access using policies You control access in Amazon by creating policies and attaching them to Amazon identities or resources. A policy defines permissions when associated with an identity or resource. Amazon evaluates these policies when a principal makes a request. Most policies are stored in Amazon as JSON documents. For more information about JSON policy documents, see [Overview of JSON policies](https://docs.amazonaws.cn/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.amazonaws.cn/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.amazonaws.cn/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.amazonaws.cn/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 Amazon managed policies from IAM in a resource-based policy. ### Access control lists (ACLs) 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. Amazon S3, Amazon WAF, and Amazon VPC are examples of services that support ACLs. To learn more about ACLs, see [Access control list (ACL) overview](https://docs.amazonaws.cn/AmazonS3/latest/userguide/acl-overview.html) in the *Amazon Simple Storage Service Developer Guide*. ### Other policy types Amazon 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.amazonaws.cn/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 Amazon Organizations. For more information, see [Service control policies](https://docs.amazonaws.cn/organizations/latest/userguide/orgs_manage_policies_scps.html) in the *Amazon 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.amazonaws.cn/organizations/latest/userguide/orgs_manage_policies_rcps.html) in the *Amazon 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.amazonaws.cn/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 Amazon determines whether to allow a request when multiple policy types are involved, see [Policy evaluation logic](https://docs.amazonaws.cn/IAM/latest/UserGuide/reference_policies_evaluation-logic.html) in the *IAM User Guide*. ## IAM permissions needed to use Amazon DMS You use certain IAM permissions and IAM roles to use Amazon DMS. If you are signed in as an IAM user and want to use Amazon DMS, your account administrator must attach the policy discussed in this section to the IAM user, group, or role that you use to run Amazon DMS. For more information about IAM permissions, see the [IAM User Guide](https://docs.amazonaws.cn/IAM/latest/UserGuide/introduction_access-management.html). The following policy gives you access to Amazon DMS, and also permissions for certain actions needed from other Amazon services such as Amazon KMS, IAM, Amazon EC2, and Amazon CloudWatch. CloudWatch monitors your Amazon DMS migration in real time and collects and tracks metrics that indicate the progress of your migration. You can use CloudWatch Logs to debug problems with a task. **Note** You can further restrict access to Amazon DMS resources using tagging. For more information about restricting access to Amazon DMS resources using tagging, see [Fine-grained access control using resource names and tags](CHAP_Security.FineGrainedAccess.md). ------ #### [ JSON ] **** ``` { "Version":"2012-10-17", "Statement": [ { "Effect": "Allow", "Action": "dms:*", "Resource": "arn:aws-cn:dms:*:123456789012:*" }, { "Effect": "Allow", "Action": [ "kms:ListAliases", "kms:DescribeKey" ], "Resource": "arn:aws-cn:kms:*:123456789012:key/*" }, { "Effect": "Allow", "Action": [ "iam:GetRole", "iam:PassRole", "iam:CreateRole", "iam:AttachRolePolicy" ], "Resource": "arn:aws-cn:iam::123456789012:role/*", "Condition": { "StringEquals": { "iam:PassedToService": "dms.amazonaws.com" } } }, { "Effect": "Allow", "Action": [ "ec2:DescribeVpcs", "ec2:DescribeInternetGateways", "ec2:DescribeAvailabilityZones", "ec2:DescribeSubnets", "ec2:DescribeSecurityGroups", "ec2:ModifyNetworkInterfaceAttribute", "ec2:CreateNetworkInterface", "ec2:DeleteNetworkInterface" ], "Resource": "*" }, { "Effect": "Allow", "Action": [ "cloudwatch:Get*", "cloudwatch:List*" ], "Resource": "*" }, { "Effect": "Allow", "Action": [ "logs:DescribeLogGroups", "logs:DescribeLogStreams", "logs:FilterLogEvents", "logs:GetLogEvents" ], "Resource": "arn:aws-cn:logs:*:123456789012:*" } ] } ``` ------ The breakdown of these following permissions might help you better understand why each one is necessary. The following section is required to allow the user to call Amazon DMS API operations. ``` { "Effect": "Allow", "Action": "dms:*", "Resource": "arn:aws:dms:region:account:resourcetype/id" } ``` The following section is required to allow the user to list their available Amazon KMS keys and alias for display in the console. This entry is not required if you know the Amazon Resource Name (ARN) for the KMS key and you are using only the Amazon Command Line Interface (Amazon CLI). ``` { "Effect": "Allow", "Action": [ "kms:ListAliases", "kms:DescribeKey" ], "Resource": "arn:aws:service:region:account:resourcetype/id" } ``` The following section is required for certain endpoint types that require an IAM role ARN to be passed in with the endpoint. In addition, if the required Amazon DMS roles aren't created ahead of time, the Amazon DMS console can create the role. If all roles are configured ahead of time, all that is required is `iam:GetRole` and `iam:PassRole`. For more information about roles, see [Creating the IAM roles to use with Amazon DMS](#CHAP_Security.APIRole). ``` { "Effect": "Allow", "Action": [ "iam:GetRole", "iam:PassRole", "iam:CreateRole", "iam:AttachRolePolicy" ], "Resource": "arn:aws:service:region:account:resourcetype/id" } ``` The following section is required because Amazon DMS needs to create the Amazon EC2 instance and configure the network for the replication instance that is created. These resources exist in the customer's account, so the ability to perform these actions on behalf of the customer is required. ``` { "Effect": "Allow", "Action": [ "ec2:DescribeVpcs", "ec2:DescribeInternetGateways", "ec2:DescribeAvailabilityZones", "ec2:DescribeSubnets", "ec2:DescribeSecurityGroups", "ec2:ModifyNetworkInterfaceAttribute", "ec2:CreateNetworkInterface", "ec2:DeleteNetworkInterface" ], "Resource": "arn:aws:service:region:account:resourcetype/id" } ``` The following section is required to allow the user to be able to view replication instance metrics. ``` { "Effect": "Allow", "Action": [ "cloudwatch:Get*", "cloudwatch:List*" ], "Resource": "arn:aws:service:region:account:resourcetype/id" } ``` This section is required to allow the user to view replication logs. ``` { "Effect": "Allow", "Action": [ "logs:DescribeLogGroups", "logs:DescribeLogStreams", "logs:FilterLogEvents", "logs:GetLogEvents" ], "Resource": "arn:aws:service:region:account:resourcetype/id" } ``` If you use the Amazon DMS console, the Amazon Command Line Interface (Amazon CLI) or the Amazon DMS API for your migration, you need to add several roles to your account. For more information about adding these roles, see [Creating the IAM roles to use with Amazon DMS](#CHAP_Security.APIRole). ## Creating the IAM roles to use with Amazon DMS If you use the Amazon DMS console, the Amazon CLI or the Amazon DMS API for your database migration, you must add three IAM roles to your Amazon account before you can use the features of Amazon DMS. Two of these are `dms-vpc-role` and `dms-cloudwatch-logs-role`. If you use Amazon Redshift as a target database, you must also add the IAM role `dms-access-for-endpoint` to your Amazon account. Updates to managed policies are automatic. If you are using a custom policy with the IAM roles, be sure to periodically check for updates to the managed policy in this documentation. You can view the details of the managed policy by using a combination of the `get-policy` and `get-policy-version` commands. For example, the following `get-policy` command retrieves information about the specified IAM role. ``` aws iam get-policy --policy-arn arn:aws:iam::aws:policy/service-role/AmazonDMSVPCManagementRole ``` The information returned from the command is as follows. ``` { "Policy": { "PolicyName": "AmazonDMSVPCManagementRole", "PolicyId": "ANPAJHKIGMBQI4AEFFSYO", "Arn": "arn:aws:iam::aws:policy/service-role/AmazonDMSVPCManagementRole", "Path": "/service-role/", "DefaultVersionId": "v4", "AttachmentCount": 1, "PermissionsBoundaryUsageCount": 0, "IsAttachable": true, "Description": "Provides access to manage VPC settings for AWS managed customer configurations", "CreateDate": "2015-11-18T16:33:19+00:00", "UpdateDate": "2024-07-25T15:19:01+00:00", "Tags": [] } } ``` The following `get-policy-version` command retrieves IAM policy information. ``` aws iam get-policy-version --policy-arn arn:aws:iam::aws:policy/service-role/AmazonDMSVPCManagementRole --version-id v4 ``` The information returned from the command is as follows. ------ #### [ JSON ] **** ``` { "Version":"2012-10-17", "Statement": [ { "Sid": "ExampleStatementID", "Effect": "Allow", "Action": [ "ec2:CreateNetworkInterface", "ec2:DeleteNetworkInterface", "ec2:DescribeAvailabilityZones", "ec2:DescribeDhcpOptions", "ec2:DescribeInternetGateways", "ec2:DescribeNetworkInterfaces", "ec2:DescribeSecurityGroups", "ec2:DescribeSubnets", "ec2:DescribeVpcs", "ec2:ModifyNetworkInterfaceAttribute" ], "Resource": "*" } ] } ``` ------ You can use the same commands to get information about `AmazonDMSCloudWatchLogsRole` and the `AmazonDMSRedshiftS3Role` managed policy. The following procedures create the `dms-vpc-role`, `dms-cloudwatch-logs-role`, and `dms-access-for-endpoint` IAM roles. **To create the dms-vpc-role IAM role for use with the Amazon CLI or Amazon DMS API** 1. Create a JSON file with the following IAM policy. Name the JSON file `dmsAssumeRolePolicyDocument.json`. ------ #### [ JSON ] **** ``` { "Version":"2012-10-17", "Statement": [ { "Effect": "Allow", "Principal": { "Service": "dms.amazonaws.com" }, "Action": "sts:AssumeRole" } ] } ``` ------ Create the role using the Amazon CLI using the following command. ``` aws iam create-role --role-name dms-vpc-role --assume-role-policy-document file://dmsAssumeRolePolicyDocument.json ``` 1. Attach the `AmazonDMSVPCManagementRole` policy to `dms-vpc-role` using the following command. ``` aws iam attach-role-policy --role-name dms-vpc-role --policy-arn arn:aws:iam::aws:policy/service-role/AmazonDMSVPCManagementRole ``` **To create the dms-cloudwatch-logs-role IAM role for use with the Amazon CLI or Amazon DMS API** 1. Create a JSON file with the following IAM policy. Name the JSON file `dmsAssumeRolePolicyDocument2.json`. ------ #### [ JSON ] **** ``` { "Version":"2012-10-17", "Statement": [ { "Effect": "Allow", "Principal": { "Service": "dms.amazonaws.com" }, "Action": "sts:AssumeRole" } ] } ``` ------ Create the role using the Amazon CLI using the following command. ``` aws iam create-role --role-name dms-cloudwatch-logs-role --assume-role-policy-document file://dmsAssumeRolePolicyDocument2.json ``` 1. Attach the `AmazonDMSCloudWatchLogsRole` policy to `dms-cloudwatch-logs-role` using the following command. ``` aws iam attach-role-policy --role-name dms-cloudwatch-logs-role --policy-arn arn:aws:iam::aws:policy/service-role/AmazonDMSCloudWatchLogsRole ``` If you use Amazon Redshift as your target database, you must create the IAM role `dms-access-for-endpoint` to provide access to Amazon S3. **To create the dms-access-for-endpoint IAM role for use with Amazon Redshift as a target database** 1. Create a JSON file with the following IAM policy. Name the JSON file `dmsAssumeRolePolicyDocument3.json`. ------ #### [ JSON ] **** ``` { "Version":"2012-10-17", "Statement": [ { "Sid": "1", "Effect": "Allow", "Principal": { "Service": "dms.amazonaws.com" }, "Action": "sts:AssumeRole" }, { "Sid": "2", "Effect": "Allow", "Principal": { "Service": "redshift.amazonaws.com" }, "Action": "sts:AssumeRole" } ] } ``` ------ 1. Create the role using the Amazon CLI using the following command. ``` aws iam create-role --role-name dms-access-for-endpoint --assume-role-policy-document file://dmsAssumeRolePolicyDocument3.json ``` 1. Attach the `AmazonDMSRedshiftS3Role` policy to `dms-access-for-endpoint` role using the following command. ``` aws iam attach-role-policy --role-name dms-access-for-endpoint \ --policy-arn arn:aws:iam::aws:policy/service-role/AmazonDMSRedshiftS3Role ``` You should now have the IAM policies in place to use the Amazon CLI or Amazon DMS API.