Permissions

IAM Permissions

New IAM users do not have any permissions assigned by default. You need to first add them to one or more groups and attach policies or roles to these groups. The users then inherit permissions from the groups and can perform specified operations on cloud services based on the permissions they have been assigned.

IAM is a global service deployed for all regions. When you set the authorization scope to Global services, users have permission to access IAM in all regions.

You can grant permissions by using roles and policies.

• Roles: A coarse-grained authorization strategy provided by IAM to assign permissions based on users' job responsibilities. Only a limited number of service-level roles are available for authorization. Cloud services depend on each other. When you grant permissions using roles, you also need to attach any existing role dependencies. Roles are not ideal for fine-grained authorization and least privilege access.
• Policies: A fine-grained authorization strategy that defines permissions required to perform operations on specific cloud resources under certain conditions. This type of authorization is more flexible and is ideal for least privilege access. For example, you can grant users only permission to manage ECSs of a certain type. A majority of fine-grained policies contain permissions for specific APIs, and permissions are defined using API actions. For the API actions supported by IAM, see "Identity and Access Management API Reference > Permissions Policies and Supported Actions."

Table 1 lists all the system-defined permissions for IAM.

Table 2 lists the common operations supported by system-defined permissions for IAM.

Tenant Guest and Tenant Administrator are basic roles provided by IAM and do not contain any specific permissions for IAM. Therefore, the two roles are not listed in the following table.

If an IAM user wants to manage the access keys of other IAM users, see Table 3. For example, if IAM user A wants to create an access key for IAM user B, IAM user A must have the Security Administrator or FullAccess permission.

Content of the FullAccess Policy

{
    "Version": "1.1",
    "Statement": [
        {
            "Action": [
                "*:*:*"
            ],
            "Effect": "Allow"
        }
    ]
}

Content of the IAM ReadOnlyAccess Policy

{
    "Version": "1.1",
    "Statement": [
        {
            "Action": [
                "iam:*:get*",
                "iam:*:list*",
                "iam:*:check*"
            ],
            "Effect": "Allow"
        }
    ]
}

Content of the Security Administrator Role

{
    "Version": "1.0",
    "Statement": [
        {
            "Action": [
                "iam:agencies:*",
                "iam:credentials:*",
                "iam:groups:*",
                "iam:identityProviders:*",
                "iam:mfa:*",
                "iam:permissions:*",
                "iam:projects:*",
                "iam:quotas:*",
                "iam:roles:*",
                "iam:users:*",
                "iam:securitypolicies:*"
            ],
            "Effect": "Allow"
        }
    ]
}

Content of the Agent Operator Role

{
    "Version": "1.0",
    "Statement": [
        {
            "Action": [
                "iam:tokens:assume"
            ],
            "Effect": "Allow"
        }
    ]
}

Content of the Tenant Guest Role

{
    "Version": "1.1",
    "Statement": [
        {
            "Action": [
                "obs:*:get*",
                "obs:*:list*",
                "obs:*:head*"
            ],
            "Effect": "Allow"
        },
        {
            "Condition": {
                "StringNotEqualsIgnoreCase": {
                    "g:ServiceName": [
                        "iam"
                    ]
                }
            },
            "Action": [
                "*:*:get*",
                "*:*:list*",
                "*:*:head*"
            ],
            "Effect": "Allow"
        }
    ]
}

Content of the Tenant Administrator Role

{
    "Version": "1.1",
    "Statement": [
        {
            "Action": [
                "obs:*:*"
            ],
            "Effect": "Allow"
        },
        {
            "Condition": {
                "StringNotEqualsIgnoreCase": {
                    "g:ServiceName": [
                        "iam"
                    ]
                }
            },
            "Action": [
                "*:*:*"
            ],
            "Effect": "Allow"
        }
    ]
}