Cloud Bastion Host (CBH)

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 also 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 How IAM Is Different from Organizations for Access Control?.

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 edit an IAM custom identity policy, see Creating a Custom Identity Policy.
For details about how to use these elements to edit 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 the URN in the Resource element of 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 CBH, 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 is empty (-) for an action, the action does not support any condition keys.
For details about the condition keys defined by CBH, 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 CBH.

**Table 1** Actions supported by CBH
Action	Description	Access Level	Resource Type (*: required)	Condition Key	Alias
cbh::listAvailableZones	Grants permission to list AZs.	List	-	-	-
cbh::getEcsQuota	Grants permission to query ECS resource quotas.	Read	-	-	-
cbh::getQuota	Grants permission to query the quota of the bastion host.	Read	-	-	-
cbh::listSpecifications	Grants permission to list bastion host specifications.	List	-	-	-
cbh:instance:listInstances	Grants permission to list bastion hosts.	List	instance *	-	-
cbh:instance:getInstanceStatus	Grants permission to query bastion host status.	Read	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:startInstance	Grants permission to start bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:stopInstance	Grants permission to stop bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:rebootInstance	Grants permission to reboot bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:upgradeInstance	Grants permission to upgrade bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:loginInstance	Grants permission to login bastion host as the IAM user.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:resetInstancePassword	Grants permission to reset the password of bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:resetInstanceLoginMethod	Grants permission to reset the login mode of bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:deleteInstance	Grants permission to delete faulty bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:alterInstance	Grants permission to alter bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:createInstance	Grants permission to create bastion host.	Write	instance *	-	-
cbh:instance:createInstance	Grants permission to create bastion host.	Write	-	g:EnterpriseProjectId g:RequestTag/tag-key g:TagKeys cbh:VpcId cbh:SubnetId cbh:AllowBindPublicIp	-
cbh:instance:bindInstanceEip	Grants permission to bind an EIP to bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:unbindInstanceEip	Grants permission to unbind an EIP to bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:updateInstanceSecurityGroup	Grants permission to update the security group of bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh::operateAuthorization	Grants permission to create or cancel the authorization of cloud bastion host service.	Write	-	-	-
cbh::getAuthorization	Grants permission to query the authorization of cloud bastion host service from the tenant.	Read	-	-	-
cbh::listTags	Grants permission to list all tags.	List	-	-	-
cbh:instance:getInstanceTags	Grants permission to query the tag information of bastion host instance.	Read	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:countInstancesByTag	Grants permission to count the number of instances that meet the label criteria.	List	instance *	-	-
cbh:instance:listInstancesByTag	Grants permission to filter instances by tags.	List	-	-	-
cbh:instance:operateInstanceTags	Grants permission to operate resource tags of bastion host instance.	Tagging	instance *	g:EnterpriseProjectId g:ResourceTag/tag-key	-
cbh:instance:operateInstanceTags		Tagging	-	g:RequestTag/tag-key g:TagKeys	-
cbh:instance:getOmUrl	Grants permission to get O&M url.	Read	instance *	g:EnterpriseProjectId g:ResourceTag/<tag-key>	cbh:instance:getOmUrl
cbh:instance:rollbackInstance	Grants permission to rollback bastion host.	Write	instance *	g:EnterpriseProjectId g:ResourceTag/<tag-key>	cbh:instance:upgrade

Each API of CBH usually supports one or more actions. Table 2 lists the supported actions and dependencies.

**Table 2** Actions and dependencies supported by CBH APIs
API	Action	Dependencies
GET /v2/{project_id}/cbs/available-zone	cbh::listAvailableZones	-
GET /v2/{project_id}/cbs/instance/specification	cbh::listSpecifications	-
GET /v2/{project_id}/cbs/instance/list	cbh:instance:listInstances	eps:enterpriseProjects:list
POST /v2/{project_id}/cbs/instance/start	cbh:instance:startInstance	-
POST /v2/{project_id}/cbs/instance/stop	cbh:instance:stopInstance	-
POST /v2/{project_id}/cbs/instance/upgrade	cbh:instance:upgradeInstance	-
POST /v2/{project_id}/cbs/instance/login	cbh:instance:loginInstance	-
PUT /v2/{project_id}/cbs/instance/password	cbh:instance:resetInstancePassword	-
PUT /v2/{project_id}/cbs/instance/login-method	cbh:instance:resetInstanceLoginMethod	-
DELETE /v2/{project_id}/cbs/instance	cbh:instance:deleteInstance	-
POST /v2/{project_id}/cbs/instance	cbh:instance:createInstance	vpc:quotas:list vpc:subnets:list vpc:subnets:get vpc:securityGroups:list ecs:cloudServerFlavors:get
PUT /v2/{project_id}/cbs/instance/{server_id}/security-groups	cbh:instance:updateInstanceSecurityGroup	vpc:ports:update
GET /v2/{project_id}/cbs/agency/authorization	cbh::getAuthorization	-
GET /v2/{project_id}/cbs/instance/tags	cbh::listTags	-
GET /v2/{project_id}/cbs/instance/{resource_id}/tags	cbh:instance:getInstanceTags	-
POST /v2/{project_id}/cbs/instance/count	cbh:instance:countInstancesByTag	-
POST /v2/{project_id}/cbs/instance/filter	cbh:instance:listInstancesByTag	-
POST /v2/{project_id}/cbs/instance/{server_id}/eip/bind	cbh:instance:bindInstanceEip	eip:publicIps:list eip:publicIps:update
POST /v2/{project_id}/cbs/instance/{server_id}/eip/unbind	cbh:instance:unbindInstanceEip	eip:publicIps:update eip:publicIps:list
GET /v2/{project_id}/cbs/instance/ecs-quota	cbh::getEcsQuota	ecs:cloudServerFlavors:get
GET /v2/{project_id}/cbs/instance/quota	cbh::getQuota	-
GET /v2/{project_id}/cbs/instance/{server_id}/status	cbh:instance:getInstanceStatus	-
POST /v2/{project_id}/cbs/instance/reboot	cbh:instance:rebootInstance	-
PUT /v2/{project_id}/cbs/instance	cbh:instance:alterInstance	-
POST /v2/{project_id}/cbs/agency/authorization	cbh::operateAuthorization	-
POST /v2/{project_id}/cbs/instance/{resource_id}/tags/action	cbh:instance:operateInstanceTags	-
GET /v2/{project_id}/cbs/instance/get-om-url	cbh:instance:getOmUrl	-
POST /v2/{project_id}/cbs/instance/rollback	cbh:instance:rollbackInstance	-

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, the resource URN must be specified in the identity policy statements using that action, and the identity policy applies only to resources of this type. 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 define in identity policy statements for CBH.

**Table 3** Resource types supported by CBH
Resource Type	URN
instance	cbh:<region>:<account-id>:instance:<instance-id>

Conditions

Condition Key Overview

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 condition key or a 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, the system 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, cbh) apply only to operations of the xx service. 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 operators.

Service-specific condition keys supported by CBH

The following table lists the condition keys that you can define in identity policies for CBH. 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 CBH
Service-specific Condition Key	Type	Single-valued/Multivalued	Description
cbh:VpcId	string	Single-valued	Filters access to control which VPC (ID) the instance can communicate with.
cbh:SubnetId	string	Single-valued	Filters access to control which CIDR (ID) the instance can communicate with.
cbh:AllowBindPublicIp	boolean	Single-valued	Filters access to control whether EIPs can be bound to the instance.