Authorization Policy Syntax

Last updated: 2020-04-01 16:46:07


Policy Syntax

CAM policy:

               "condition": {"key":{"value"}} 
  • version is required. Currently, only "2.0" is allowed.
  • statement describes the details of one or more permissions. This element contains a permission or permission set of other elements such as effect, action, resource, and condition. One policy has only one statement.
    • effect describes whether the result produced by the statement is "allowed" (allow) or "denied" (deny). This element is required.
    • action describes the allowed or denied action (operation). An operation can be an API (prefixed with "cdb:"). This element is required.
    • resource describes the details of authorization. A resource is described in a six-segment format. Detailed resource definitions vary by product. This element is required.
    • condition describes the condition for the policy to take effect. A condition consists of operator, action key, and action value. A condition value may contain information such as time and IP address. Some services allow you to specify additional values in a condition. This element is required.

TencentDB Operations

In a TencentDB policy statement, you can specify any API action from any service that supports TencentDB. APIs prefixed with "cdb:" should be used for TencentDB, such as cdb:CreateDBInstance or cdb:CreateAccounts.

To specify multiple operations in a single statement, separate them with commas, as shown below:


You can also specify multiple operations using a wildcard. For example, you can specify all operations beginning with "Describe" in name, as shown below:


If you want to specify all operations in TencentDB, use a wildcard as shown below:


TencentDB Resources

Each CAM policy statement has its own resources.
Resources are generally in the following format:

  • project_id describes the project information, which is only used to enable compatibility with legacy CAM logic and can be left empty.
  • service_type describes the product abbreviation such as COS.
  • region describes the region information, such as ap-guangzhou.
  • account is the root account of the resource owner, such as uin/653339763.
  • resource describes detailed resource information of each product, such as instanceId/instance_id1 or instanceId/*.

For example, you can specify a resource for a specific instance (cdb-k05xdcta) in a statement as shown below:

"resource":[ "qcs::cdb:ap-guangzhou:uin/653339763:instanceId/cdb-k05xdcta"]

You can also use the wildcard "*" to specify it for all instances that belong to a specific account as shown below:

"resource":[ "qcs::cdb:ap-guangzhou:uin/653339763:instanceId/*"]

If you want to specify all resources or a specific API operation does not support resource-level permission control, you can use the wildcard "*" in the "resource" element as shown below:

"resource": ["*"]

To specify multiple resources in a single command, separate them with commas. Below is an example where two resources are specified:


The table below describes the resources that can be used by TencentDB and the corresponding resource description methods, where words prefixed with $ are placeholders, project refers to a project ID, region refers to a region, and account refers to an account ID.

Resource Resource Description Method in Authorization Policy
Instance qcs::cdb:$region:$account:instanceId/$instanceId
VPC qcs::vpc:$region:$account:vpc/$vpcId
Security group qcs::cvm:$region:$account:sg/$sgId