Image Management Service (IMS)

IAM provides system-defined identity policies to define common actions supported by cloud services. You can also create custom identity policies using the actions supported by cloud services for more refined access control.

In addition to IAM, the Organizations service provides Service Control Policies (SCPs) to set access control policies.

SCPs do not actually grant any permissions to an entity. They only set the permissions boundary for the entity. When SCPs are attached to an organizational unit (OU) or a member account, the SCPs do not directly grant permissions to that OU or member account. Instead, the SCPs only determine what permissions are available for that member account or those member accounts under that OU. The granted permissions can be applied only if they are allowed by the SCPs.

To learn more about how IAM is different from Organizations for access control, see What Are the Differences in Access Control Between IAM and Organizations?.

This section describes the elements used by IAM custom identity policies and Organizations SCPs. The elements include actions, resources, and conditions.

For details about how to use these elements to create an IAM custom identity policy, see Creating a Custom Identity Policy.
For details about how to use these elements to create a custom SCP, see Creating an SCP.

Actions

Actions are specific operations that are allowed or denied in an identity policy.

The Access Level column describes how the action is classified (List, Read, or Write). This classification helps you understand the level of access that an action grants when you use it in an identity policy.
The Resource Type column indicates whether the action supports resource-level permissions.
- You can use a wildcard (*) to indicate all resource types. If this column is empty (-), the action does not support resource-level permissions and you must specify all resources ("*") in your identity policy statements.
- If this column includes a resource type, you must specify a URN for the Resource element in your identity policy statements.
- Required resources are marked with asterisks (*) in the table. If you specify a resource in a statement using this action, then it must be of this type.
For details about the resource types defined by IMS, see Resources.
The Condition Key column contains keys that you can specify in the Condition element of an identity policy statement.
- If the Resource Type column has values for an action, the condition key takes effect only for the listed resource types.
- If the Resource Type column is empty (-) for an action, the condition key takes effect for all resources that action supports.
- If the Condition Key column of an action is empty (-), the action does not support any condition keys.
For details about the condition keys defined by IMS, see Conditions.
The Alias column lists the policy actions that are configured in identity policies. With these actions, you can use APIs for policy-based authorization. For details, see Policies and Identity Policies.

The following table lists the actions that you can define in identity policy statements for IMS.

**Table 1** Supported Actions
Action	Description	Access Level	Resource Type (*: required)	Condition Key	Alias
ims:images:list	Viewing images	list	-	g:EnterpriseProjectId	-
ims:images:get	Viewing details about a specified image	read	image *	-	-
ims:images:create	Creating image metadata	write	-	g:RequestTag/<tag-key> g:TagKeys	-
ims:images:share NOTE: The action ims:images:share is not recommended. Instead, the following actions are recommended for sharing images: ims:images:addMember ims:images:deleteMember ims:images:updateMemberStatus	Sharing images	permission_management	image *	ims:TargetOrgPaths g:ResourceTag/<tag-key> g:EnterpriseProjectId	-
ims:images:copyInRegion	Replicating images within a region	write	image *	g:ResourceTag/<tag-key> g:EnterpriseProjectId ims:Encrypted	ims:images:copy
ims:images:copyCrossRegion	Replicating images across regions	write	image *	g:ResourceTag/<tag-key> g:EnterpriseProjectId ims:Region ims:VaultId g:RequestedRegion	ims:images:copy
ims:quotas:get	Querying the image quota	read	-	-	-
ims:images:upload	Uploading images	write	image *	-	-
ims:wholeImages:create	Creating full-ECS images	write	-	g:EnterpriseProjectId g:RequestTag/<tag-key> g:TagKeys ims:Encrypted ims:OriginBucketOrgPaths ims:SourceAvailabilityZone ims:InstanceId ims:VaultId ims:BackupId	-
ims:images:export	Exporting images	read	image *	-	-
ims:dataImages:create	Creating data disk images from external image files	write	-	g:EnterpriseProjectId g:RequestTag/<tag-key> g:TagKeys	-
ims:serverImages:create	Creating images	write	-	g:EnterpriseProjectId g:RequestTag/<tag-key> g:TagKeys ims:Encrypted ims:OriginBucketOrgPaths ims:SourceAvailabilityZone ims:InstanceId ims:VolumeId	-
ims:images:setTags	Updating image tags	tagging	image *	g:RequestTag/<tag-key> g:TagKeys	ims:images:update
ims:images:getTags	Querying image tags	read	-	g:EnterpriseProjectId g:RequestTag/<tag-key> g:TagKeys	ims:images:list
ims:images:deleteImage	Deleting images	write	image *	-	ims:images:update
ims:images:updateImage	Updating image information	write	image *	-	-
ims:images:listOsVersion	Querying OSs supported by images	list	-	-	ims:images:list
ims:images:getJob	Querying progresses of asynchronous tasks	read	-	-	ims:images:list
ims:images:import	Importing images	write	-	g:EnterpriseProjectId g:RequestTag/<tag-key> g:TagKeys	-
ims:images:setOrDeleteTags	Adding or deleting image tags in a batch	write	-	g:RequestTag/<tag-key> g:TagKeys	-
ims:images:updateMemberStatus	Updating the status of members who can use shared images	write	image *	g:RequestTag/<tag-key>	ims:images:share
ims:images:addMember	Adding a tenant that can use a shared image	write	image *	g:EnterpriseProjectId g:ResourceTag/<tag-key> ims:TargetOrgPaths	ims:images:share
ims:images:deleteMember	Deleting a tenant from the group where the members can use a shared image	write	image *	g:EnterpriseProjectId g:ResourceTag/<tag-key>	ims:images:share
ims:images:listImagesByTag	Querying images by tag	read	-	-	ims:images:list
ims:images:showImageTags	Querying tags of an image	read	image *	g:EnterpriseProjectId g:ResourceTag/<tag-key>	ims:images:list
ims:images:listImageTags	Querying project tags	list	-	-	-

An IMS API usually supports one or more actions. Table 2 lists the supported actions and dependencies.

**Table 2** Actions and dependencies supported by IMS APIs
API	Action	Dependencies
GET /v2/cloudimages	ims:images:list	-
GET /v2/images/{image_id}	ims:images:get	-
POST /v2/images	ims:images:create	-
POST /v2/images/{image_id}/members	ims:images:share	ims:images:get
POST /v1/cloudimages/{image_id}/copy	ims:images:copyInRegion	ims:serverImages:create
POST /v1/cloudimages/{image_id}/cross_region_copy	ims:images:copyCrossRegion	-
GET /v1/cloudimages/quota	ims:quotas:get	-
PUT /v1/cloudimages/{image_id}/upload PUT /v2/images/{image_id}/file	ims:images:upload	ims:images:get ims:images:update
POST /v1/cloudimages/wholeimages/action	ims:wholeImages:create	-
POST /v1/cloudimages/{image_id}/file	ims:images:export	obs:object:GetObject obs:object:PutObject
POST /v2/cloudimages/quickimport/action (required only for quickly importing a data disk image) POST /v1/cloudimages/dataimages/action	ims:dataImages:create	-
PATCH /v2/cloudimages/{image_id} (required only for enterprise project migration) POST /v2/cloudimages/action OST /v2/cloudimages/quickimport/action (required only for quickly importing a system disk image) POST /v1/cloudimages/{image_id}/copy (required only by enterprise project users)	ims:serverImages:create	-
PUT /v1/cloudimages/tags	ims:images:setTags	-
GET /v1/cloudimages/tags	ims:images:getTags	-
DELETE /v2/images/{image_id}	ims:images:deleteImage	-
PATCH /v2/cloudimages/{image_id} PATCH /v2/images/{image_id}	ims:images:updateImage	-
GET /v1/cloudimages/os_version	ims:images:listOsVersion	-
GET /v1/cloudimages/job/{job_id}	ims:images:getJob	-
POST /v2/cloudimages/quickimport/action	ims:images:import	ims:dataImages:create ims:serverImages:create
POST /v2/{project_id}/images/{image_id}/tags/action	ims:images:setOrDeleteTags	ims:images:setTags ims:images:deleteTags
PUT /v1/cloudimages/members PUT /v2/images/{image_id}/members/{member_id}	ims:images:updateMemberStatus	-
POST /v1/cloudimages/members	ims:images:addMember	-
DELETE /v1/cloudimages/members	ims:images:deleteMember	-
POST /v2/{project_id}/images/resource_instances/action	ims:images:listImagesByTag	-
GET /v2/{project_id}/images/{image_id}/tags	ims:images:showImageTags	-
GET /v2/{project_id}/images/tags	ims:images:listImageTags	-

Resources

A resource type indicates the resources that an identity policy applies to. If you specify a resource type for any action in Table 3, a resource URN must be specified in the identity policy statements using that action, and the identity policy applies only to the resource. If no resource type is specified, the Resource element is marked with an asterisk (*) and the identity policy applies to all resources. You can also set condition keys in an identity policy to define resource types.

The following table lists the resource types that you can specify in identity policy statements for IMS.

**Table 3** Resource types supported by IMS
Resource Type	URN
Image	ims:<region>:<account-id>:image:<image-id>

<region> indicates the region where a user is authorized to perform operations.
<account-id> indicates the ID of an authorized user account. Obtain an account ID as instructed in API Credentials.
<image-id> indicates the ID of the image on which a user is authorized to perform operations.

You can use a wildcard (*) in URN to indicate all resources.

Conditions

A Condition element lets you specify conditions for when an identity policy is in effect. It contains condition keys and operators.

The condition key that you specify can be a global or service-specific condition key.
- Global condition keys (with the g: prefix) apply to all actions. Cloud services do not need to provide user identity information. Instead, IAM automatically obtains such information and authenticates users. For details, see Global Condition Keys.
- Service-specific condition keys (with the abbreviation of a service name plus a colon as the prefix, for example, ims:) only apply to operations of IMS. For details, see Table 4.
- The number of values associated with a condition key in the request context of an API call makes the condition key single-valued or multivalued. Single-valued condition keys have at most one value in the request context of an API call. Multivalued condition keys can have multiple values in the request context of an API call. For example, a request can originate from at most one VPC endpoint, so g:SourceVpce is a single-valued condition key. You can tag resources and include multiple tag key-value pairs in a request, so g:TagKeys is a multivalued condition key.
A condition operator, condition key, and a condition value together constitute a complete condition statement. An identity policy can be applied only when its request conditions are met. For supported condition operators, see Condition operators.

The following table lists the condition keys that you can define in identity policies for IMS. You can include these condition keys to specify conditions for when your identity policy is in effect.

**Table 4** Service-specific condition keys supported by IMS
Condition Key	Value Type	Single-valued/Multivalued	Description
ims:TargetOrgPaths	string	Multivalued	Filters access based on the Organizations Path of the specified sharing account.
ims:Encrypted	boolean	Single-valued	Controls operations such as image import and replication based on whether images are encrypted.
ims:TargetBucketOrgPaths	string	Multivalued	Filters access based on the Organizations Path of the specified destination bucket owner account.
ims:OriginBucketOrgPaths	string	Multivalued	Filters access based on the Organizations Path of the specified source bucket owner account.
ims:SourceAvailabilityZone	string	Multivalued	Filters access based on the specified AZ.
ims:InstanceId	string	Single-valued	Controls full-ECS image creation based on the specified ECS ID.
ims:VaultId	string	Single-valued	Controls creation and cross-region replication of full-ECS images based on the specified vault ID.
ims:VolumeId	string	Multivalued	Controls image creation based on the specified volume ID.
ims:BackupId	string	Single-valued	Controls full-ECS image creation based on the specified backup ID.
ims:Region	string	Single-valued	Controls cross-region replication based on the specified destination region.