阿里云跨账号访问：AWS Switch Role等价功能咨询

Absolutely! AliCloud has a direct equivalent to AWS's switch role functionality, built right into its Resource Access Management (RAM) service. This lets you grab temporary credentials by assuming a role in another AliCloud account, then use those credentials to create and access resources exactly as that role is permitted.

Key Concepts & Workflow #

It maps closely to AWS's model, with these core pieces:

• RAM Role (Target Account): The role in the destination account that defines the permissions you want to use (just like an AWS IAM cross-account role).
• Trust Relationship: The target account must explicitly grant your source account (or a specific RAM user/role in it) permission to assume this role.
• Temporary Credentials: After assuming the role, you get short-lived AccessKeyId, AccessKeySecret, and SecurityToken—similar to AWS STS tokens.

Step-by-Step Implementation #

1. Create a Cross-Account RAM Role in the Target Account #

First, in the account where you need to access resources:

• Head to the RAM Console, create a new role, and select "Another AliCloud account" as the trusted entity.
• Enter the ID of your source account (the one you're starting from).
• Attach permission policies to this role (e.g., AliECSFullAccess for full ECS control, or custom policies for granular resource access).

2. Allow AssumeRole Access in the Source Account #

In your source account:

• If using a RAM user, attach a policy that lets them call the ram:AssumeRole action for the target role's ARN. Example policy snippet:

  {
      "Version": "1",
      "Statement": [
          {
              "Effect": "Allow",
              "Action": "ram:AssumeRole",
              "Resource": "acs:ram::TARGET_ACCOUNT_ID:role/TARGET_ROLE_NAME"
          }
      ]
  }
  

3. Retrieve Temporary Credentials via STS #

Use AliCloud's Security Token Service (STS) via CLI or SDK to assume the role:

• CLI Command:

  aliyun sts AssumeRole --RoleArn "acs:ram::TARGET_ACCOUNT_ID:role/TARGET_ROLE_NAME" --RoleSessionName "my-cross-account-session"
  

  The response will include a Credentials object with your temporary access keys and security token.

4. Use Temporary Credentials to Manage Resources #

You can use these credentials with AliCloud tools immediately:

• For CLI, set these environment variables:

  export ALIBABA_CLOUD_ACCESS_KEY_ID="TEMP_ACCESS_KEY"
  export ALIBABA_CLOUD_ACCESS_KEY_SECRET="TEMP_SECRET_KEY"
  export ALIBABA_CLOUD_SECURITY_TOKEN="TEMP_SECURITY_TOKEN"
  

  Now commands like aliyun ecs DescribeInstances will run under the assumed role's permissions in the target account.

Quick Notes #

• Temporary credentials expire by default after 1 hour, but you can adjust this up to 12 hours when calling AssumeRole.
• Role chaining (assuming a role from another assumed role) is also supported, just make sure to set up nested trust relationships correctly.

内容的提问来源于stack exchange，提问作者axon_synapse