tencent cloud

Overview

Cloud Access Management (CAM) is a Tencent Cloud authentication and authorization service, which helps you manage the access to your Tencent Cloud resources. You can manage authorized objects, resources, and operations, and set policies to control access when granting permissions.

Features

Granting access to resources under the root account

You can grant the access to the resources under your root account to other users, including sub-accounts and other root accounts, without sharing the identity credentials of your root account.

Granular permission management

Different access permissions to different resources can be granted to different users. For example, some sub-accounts can be granted the read access to a COS bucket, while some other sub-accounts or root accounts can own the write access to a COS object. The above-mentioned resources, access permissions and users can all be managed in batch.

Eventual consistency

CAM currently supports data synchronization across Tencent Cloud regions by copying policies. CAM policies can be modified timely, but it may take some time for those policies synced across regions to take effect. Additionally, CAM uses cache (currently valid for one minute) to improve performance, and any policy update does not take effect until cache expires.

Use Cases

Enterprise sub-account access permission management

Enterprises may need to grant the minimal access permission for their cloud resources to all kinds of employees. Assume that an enterprise owns many cloud resources (CVM, VPC instances, CDN instances, COS buckets and objects, etc.) and many employees (developers, testers, OPS personnel, etc.).
The developers need the read and write permissions to the project-related cloud resources on the development servers. Testers need the read and write permissions to the project-related cloud resources on the test servers. OPS personnel are responsible for the purchase and daily operation of the servers. If the duty or project of an employee changes, the corresponding permissions should be terminated.

Cross-enterprise access permission management

There are cases where enterprises may need to share their cloud resources. For example, a company which has many cloud resources wants to focus on product R&D and outsource the operation of its cloud resources to another company. It also need to revoke all permissions that have been granted as soon as the outsourcing service contracts are terminated.

Policy Syntax

A CAM policy consists of several elements and is used to describe specific information about authorization. Core elements include principal, action, resource, condition, and effect. For more information, please see Access Policy Language Overview.

Note：

• There is no particular sequence in the description of policy syntax. However, please note that the action element is case-sensitive.
• If there are no particular conditions required, the condition element is optional.
• You cannot define the principal element in the console, but only through the policy management APIs or policy syntax parameters.

Core elements

Policy limits

Example policy

The policy in this example allows the sub-account with ID 100000000011 under the root account with ID 100000000001 (APPID: 1250000000) to PUT Object and GET Object on the bucket "examplebucket-bj" in Beijing region and the object “exampleobject” in the bucket “examplebucket-gz” in Guangzhou region, on condition that the access IP falls within the IP address range 10.*.*.10/24.

{
    "version": "2.0",
    "principal": {
        "qcs": ["qcs::cam::uin/100000000001:uin/100000000011"]

        
    },
    "statement": [{
            "effect": "allow",
            "action": ["name/cos:PutObject", "name/cos:GetObject"],
            "resource": ["qcs::cos:ap-beijing:uid/1250000000:examplebucket-bj-1250000000/*",
                "qcs::cos:ap-guangzhou:uid/1250000000:examplebucket-gz-1250000000/exampleobject"
            ],
            "condition": {
                "ip_equal": {
                    "qcs:ip": "10.*.*.10/24"
                }
            }
        
    }]
}