Help Center/ Object Storage Service/ Permissions Configuration Guide (Ally Region)/ Permission Configuration in Typical Scenarios/ Granting Permissions to an IAM User Under the Current Account/ Granting an IAM User the Specific Permissions on Specific Objects
Updated on 2026-03-17 GMT+08:00
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Granting an IAM User the Specific Permissions on Specific Objects

Scenario

This topic describes how to grant an IAM user the permissions to download specific objects from a bucket.

To grant other permissions, select required actions from Action Name in the bucket policy. For details, see Action/NotAction.

Recommended Configuration

To grant resource-level permissions to an IAM user, use a bucket policy.

Precautions

After configuration, the IAM user can download objects using APIs. However, if they download objects using OBS Console or OBS Browser+, a message will be displayed indicating that they do not have the required permissions.

When they log in to OBS Console or OBS Browser+, APIs such as ListAllMyBuckets and ListBucket are called. ListAllMyBuckets loads the bucket list while ListBucket loads the object list. Some other APIs are also called on other pages. In such case, the message is displayed.

To allow an IAM user to download objects on OBS Console or OBS Browser+, you need to configure custom IAM policies. For details, see Follow-up Procedure.

Procedure

  1. In the bucket list, click the bucket name you want to go to the Overview page.
  2. In the navigation pane, choose Permissions.

Follow-up Procedure

To perform specific operations on OBS Console or OBS Browser+, you must add the obs:bucket:ListAllMyBuckets and obs:bucket:ListBucket permissions to the custom IAM policy. obs:bucket:ListAllMyBuckets lists buckets while obs:bucket:ListBucket lists objects in a bucket.

obs:bucket:ListAllMyBuckets applies to all resources while obs:bucket:ListBucket applies only to the authorized bucket, so you need to add the two permissions to the policy.

  1. Configure a custom policy.

    Table 1 Parameters for configuring a custom policy

    Parameter

    Description

    Policy Name

    Enter a policy name.

    Policy View

    Select one based on your own habits. Visual editor is used here.

    Policy Content

    [Permission 1]

    • Select Allow.
    • Select Object Storage Service (OBS).
    • Select obs:bucket:ListAllMyBuckets from the actions.
    • Select All for resources.

    [Permission 2]

    • Select Allow.
    • Select Object Storage Service (OBS).
    • Select obs:bucket:ListBucket from the actions.
    • Select Specific for Resources and select Specify resource path for Bucket. Click Add Resource Path. Enter the bucket name in the Path text box to apply the policy only to this bucket.

    Scope

    Use the default value Global services.

  2. Click OK.
  3. .

    Apply the created custom policy to the user group by following the instructions in the IAM document.

  4. .

    Due to data caching, it takes about 10 to 15 minutes for a custom policy to take effect.