Grant permissions to RAM users and RAM roles - Alibaba Cloud Service Mesh

You can authorize a RAM user or a RAM role to use Service Mesh (ASM) as needed by granting required permissions to the RAM user or RAM role. Only authorized RAM users and RAM roles can perform operations such as creating ASM instances and updating ASM configurations in the ASM console. This eliminates security risks caused by the leakage of AccessKey pairs of Alibaba Cloud accounts. This topic describes how to grant permissions to a RAM user and a RAM role.

Prerequisites

A RAM user and a RAM role are created. For more information, see Create a RAM user and Create a RAM role for a trusted Alibaba Cloud account.
You have a basic knowledge of the policy elements, structure, and syntax. For more information, see Policy structure and syntax.

Background information

The permissions required by RAM users and RAM roles vary with different scenarios.

If a RAM user or a RAM role needs to manage ASM instances but not Container Service for Kubernetes (ACK) clusters, you need to grant only permissions on ASM instances to the RAM user or RAM role. For more information, see Attach system policies to RAM users and RAM roles and Attach custom policies to RAM users and RAM roles.
If a RAM user or a RAM role needs to manage both ASM instances and ACK clusters, you must grant permissions on ASM instances and ACK clusters to the RAM user or RAM role. For example, the RAM user or RAM role needs to add ACK clusters to ASM instances and remove ACK clusters from ASM instances. For more information, see Attach system policies to RAM users and RAM roles, Attach custom policies to RAM users and RAM roles, and Create a custom RAM policy.

Attach system policies to RAM users and RAM roles

By default, ASM creates two system policies: AliyunASMReadOnlyAccess and AliyunASMFullAccess. You can attach the policies to RAM users and RAM roles. The following part describes the two system policies:

AliyunASMReadOnlyAccess
The policy contains only read-only permissions on ASM instances. After you attach the policy to a RAM user, the RAM user can only view the information about ASM instances but cannot modify the configurations of ASM instances.
AliyunASMFullAccess
The policy contains all permissions on ASM instances. After you attach the policy to a RAM user, the RAM user has the same permissions on ASM instances as an Alibaba Cloud account and can perform all operations on ASM instances.

The following part describes how to attach a system policy to a RAM user or RAM role. In the following example, the AliyunASMReadOnlyAccess policy is attached to a RAM user. For more information, see Grant permissions to a RAM user and Grant permissions to a RAM role.

Log on to the RAM console with an Alibaba Cloud account or a RAM user who has administrative rights.
In the left-side navigation pane, choose Identities > Users.
On the Users page, find the required RAM user and click Add Permissions in the Actions column.
In the Add Permissions panel, grant the permissions to the RAM user.
1. Select the authorization scope.
  - Alibaba Cloud Account: The authorization takes effect on the current Alibaba Cloud account.
  - Specific Resource Group: The authorization takes effect on a specific resource group.
    Note
    If you select Specific Resource Group for Authorized Scope, make sure that the required cloud service supports resource groups. For more information, see Services that work with Resource Group. For more information about how to grant permissions on a resource group, see Use a resource group to grant a RAM user the permissions to manage a specific ECS instance.
2. Specify the principal.
  The principal is the RAM user to which you want to grant permissions.
3. Click System Policy in the Select Policy section, enter AliyunASMReadOnlyAccess in the search box and then click AliyunASMReadOnlyAccess in the Authorization Policy Name column.
  Note
  You can attach a maximum of five policies to a RAM user at a time. If you want to attach more than five policies to a RAM user, repeat the operation.
Click OK.
Click Complete.

Attach custom policies to RAM users and RAM roles

If you want to enforce fine-grained control on permissions, you can create custom policies and attach custom policies to RAM users and RAM roles.

Create a policy that is used to grant permissions on ASM instances

Log on to the RAM console as a RAM user who has administrative rights.
In the left-side navigation pane, choose Permissions > Policies
On the Policies page, click Create Policy.
On the Create Policy page, click the JSON tab.

Enter a policy document and click Next to edit policy information.

You can modify the Action field in the Statement block to enable fine-grained authentication for API operations. In this example, a policy with limited permissions is created. The policy grants all RAM permissions on ASM except role-based access control (RBAC) authorization permissions. A RAM user to which the policy is attached cannot grant RBAC permissions to other users but has all other permissions. For more information about the syntax and structure of RAM policies, see Policy structure and syntax.

{
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "servicemesh:Add*",
                "servicemesh:CRBatchDeletion",
                "servicemesh:Create*",
                "servicemesh:Delete*",
                "servicemesh:Describe*",
                "servicemesh:Enable*",
                "servicemesh:Disable*",
                "servicemesh:Get*",
                "servicemesh:InvokeApiServer",
                "servicemesh:List*",
                "servicemesh:Modify*",
                "servicemesh:Re*",
                "servicemesh:Run*",
                "servicemesh:Set*",
                "servicemesh:Sync*",
                "servicemesh:Update*",
                "servicemesh:Upgrade*"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "log:ListLogStores",
                "log:ListDashboard",
                "log:GetDashboard",
                "log:ListSavedSearch",  
                "log:ListProject"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "log:GetLogStoreLogs",
            "Resource": "acs:log:*:*:project/*/logstore/audit-*"
        },
        {
            "Effect": "Allow",
            "Action": "log:GetLogStoreLogs",
            "Resource": "acs:log:*:*:project/*/logstore/istio-*"
        },
        {
            "Action": "ram:CreateServiceLinkedRole",
            "Resource": "*",
            "Effect": "Allow",
            "Condition": {
                "StringEquals": {
                    "ram:ServiceName": "servicemesh.aliyuncs.com"
                }
            }
        }
    ],
    "Version": "1"
}

In the Basic Information section, enter a policy name in the Name field. In this example, the policy name is ASMPolicy1. Then, click OK.

Attach the custom policy to a RAM user or RAM role

In this example, the custom policy is attached to a RAM user. For more information about how to attach a custom policy to a RAM role, see Grant permissions to a RAM role.

Log on to the RAM console as a RAM user who has administrative rights.
In the left-side navigation pane, choose Identities > Users.
On the Users page, find the required RAM user and click Add Permissions in the Actions column.
In the Add Permissions panel, set Authorized Scope to Alibaba Cloud Account. The name of the current RAM user is automatically filled in the Principal field. Click Custom Policy in the Select Policy section, enter ASMPolicy1 in the search box, click ASMPolicy1 in the Authorization Policy Name column, and then click OK.

Sample scenarios of custom policies

Scenario 1: Grant the permissions on a single ASM instance

You can use the following script to create a policy that grants the permissions on a single ASM instance. After you attach the policy to a RAM user or RAM role, the RAM user or RAM role can manage only the ASM instance with the specified ID.

Note

When you create the policy, replace <ServicemeshId> in the script with the ID of the ASM instance on which you want to grant permissions.

{
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "servicemesh:*",
      "Resource": "acs:servicemesh:*:*:servicemesh/<ServicemeshId>"
    },
    {
      "Effect": "Allow",
      "Action": "servicemesh:DescribeServiceMeshes",
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": "log:GetLogStoreLogs",
      "Resource": "acs:log:*:*:project/*/logstore/audit-<ServicemeshId>"
    },
    {
      "Effect": "Allow",
      "Action": "log:GetLogStoreLogs",
      "Resource": "acs:log:*:*:project/*/logstore/istio-<ServicemeshId>"
    }
  ],
  "Version": "1"
}

Scenario 2: Grant the read and write permissions on Istio resources in the ASM console

By default, the system policy AliyunASMReadOnlyAccess provided by ASM grants RAM users or RAM roles the read-only permissions on ASM instances. RAM users or RAM roles to which this policy is attached cannot manage Istio resources in ASM.

You can use the following script to create a policy that grants the read and write permissions on Istio resources. After you attach the policy to a RAM user or RAM role, the RAM user or RAM role can use the ASM console to manage Istio resources on ASM instances. However, the RAM user or RAM role cannot change other settings of the ASM instances, such as feature settings.

{
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "servicemesh:List*",
                "servicemesh:Describe*",
                "servicemesh:Get*",
                "servicemesh:InvokeApiServer"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "log:ListLogStores",
                "log:ListDashboard",
                "log:GetDashboard",
                "log:ListSavedSearch"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "log:GetLogStoreLogs",
            "Resource": "acs:log:*:*:project/*/logstore/audit-*"
        }
    ],
    "Version": "1"
}

Scenario 3: Grant RBAC authorization permissions

You can use the following script to create a policy that grants RBAC authorization permissions. After you attach the policy to a RAM user or RAM role, the RAM user or RAM role can use the ASM console to manage the RBAC permissions of other RAM roles or RAM users. However, the RAM user or RAM role cannot manage ASM instances.

{
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "servicemesh:DescribeUserPermissions",
                "servicemesh:GrantUserPermissions",
                "servicemesh:DescribeServiceMeshes",
                "servicemesh:DescribeUsersWithPermissions"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "ims:ListUserBasicInfos",
            "Resource": "*"
        }
    ],
    "Version": "1"
}