Patent Grant
10333985
Virtual machine-based virtualization provides the same isolation as physical machines, while offering flexibility and density. Today, many server scenarios are adopting containers both in the enterprise and in the cloud. While enterprise and cloud computing reap the benefits, containers also hold promise for client devices.
Distribution and management of services in virtual environments is described herein. In one or more implementations, a service distribution and management model is implemented in which system services and applications are seamlessly distributed across multiple containers which each implement a different runtime environment.
In one or more implementations, a system for distributing access to services in a host operating system of a computing device includes a host operating system configured to implement a host runtime environment, and one or more services implemented by the host operating system. The system further includes a service control manager configured to enable communication between a client stub of a service implemented in a client runtime environment and a service provider of the service that is implemented in a service runtime environment that is separate from the first client runtime environment.
In one or more implementations, a service control manager configured to distribute and manage services across containers is provided in a host runtime environment. A request to access a service is received at the service control manager from a client stub of a client implemented in a client runtime environment of a first container. The request is validated against a set of security rules and policies, and the client is granted access to the service if the client is permitted to access the service based on the set of security rules and policies. Next, if a service provider of the service is available, connection information is returned to the client. The service provider may be implemented in a service runtime environment of a second container that is separate from the first container. Alternately, if the service provider of the service is not available, a new instance of the service provider is started in a new service runtime environment and connection information is returned to the client.
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The use of the same reference numbers in different instances in the description and the figures may indicate similar or identical items. Entities represented in the figures may be indicative of one or more entities and thus reference may be made interchangeably to single or plural forms of the entities in the discussion.
Virtual machine-based virtualization provides the same isolation as physical machines, while offering flexibility and density. Container-based virtualization provides a lighter weight virtualization environment, improved compatibility and lower operational costs. Today, many server scenarios are adopting containers both in the enterprise and in the cloud. While enterprise and cloud computing reap the benefits, containers also hold promise in client. Beyond providing a great software development environment, containers will provide the next generation of features around security and isolation. Containers achieve their lightweight attributes through sharing aspects of the operating system. This may include sharing of files and folders, sharing configurations, sharing devices, and sharing operating system services. In some environments, such as friendly multi-tenant hosting, overlapping processes can be “de-duplicated” thereby enabling even more efficient resource utilization.
Distribution and management of services in virtual environments is described herein. In one or more implementations, a service distribution and management model is implemented in which system services and applications are seamlessly distributed across multiple containers which each implement a different runtime environment. Compared to existing container models, this service distribution and management model provides a similar level of service to applications but significantly reduces the overhead of each runtime environment such that guest operating systems of the containers use fewer hardware resources.
In order to achieve a lightweight runtime environment and to reduce complexity, the service distribution and management model separates each service into two components: a service provider and a client stub. Both the service provider and the client stub can be implemented in separate containers or they can be implemented in the host runtime environment. Thus, if a particular container needs to access a service, the container hosts a client stub of the service which is configured to communicate with a service provider which may be running in a different container or in the host runtime environment. Notably, by separating services into a client stub and service provider, the service distribution and management model enables a particular service to be shared across different containers and runtime environments. For example, a single service provider can be implemented in a first container and shared by multiple different client stubs that are each implemented in separate containers.
The system 100 includes a host operating system 102, a management and monitoring service 104, and a web proxy 106. The management and monitoring service 104 is representative of a service that provides one or more administrative policies for the computing device implementing the host operating system 102, as discussed herein. The web proxy 106 is representative of functionality that controls access to one or more network resources 122(1), . . . , 122(m) accessed remotely from the computing device implementing the host operating system 102. For example, in one or more embodiments web proxy 106 controls access to one or more resources accessed from network 108 by requiring authentication from host operating system 102, as discussed in further detail below. Alternatively, in one or more embodiments the computing device implementing host operating system 102 accesses network resources via network 108 independent of a web proxy. Network 108 represents functionality of a data network, such as the Internet, a local area network (LAN), a public telephone network, an intranet, other public and/or proprietary networks, combinations thereof, and so forth. As such, network resources 122(1), . . . , 122(m) accessed via network 108 may include web sites, web applications, emails, documents, and so on.
In one or more embodiments, the host operating system 102, management and monitoring service 104, and web proxy 106 are implemented as part of the same computing device. Alternatively, at least part of the management and monitoring service 104 and/or web proxy 106 can be implemented on a device that is separate and remote from the device implementing the host operating system 102. For example, in one or more embodiments the management and monitoring service 104 is implemented as a mobile device management (MDM) service located remotely from a computing device implementing host operating system 102. Alternatively or additionally, the management and monitoring service 104 may be implemented as a lightweight directory access protocol (LDAP) server located remotely from a computing device implementing host operating system 102. Similarly, the web proxy 106 may be implemented remotely from the device implementing the host operating system 102.
The management and monitoring service 104 is configured to provide (e.g., push) policy to the host operating system 102. In one or more embodiments, the management and monitoring service 104 is configured to push policy to the host operating system 102 at regular intervals, such as at system startup, daily, and so on. Alternatively, the management and monitoring service 104 may be configured to push policy to the host operating system 102 whenever there is an update to policy for the host operating system. Although reference is made herein to policy being pushed to the host operating system 102, management and monitoring service 104 is configured to provide policy to host operating system via any suitable data transmission methods (e.g., streaming, file-based updates, and so forth.). Alternatively, in one or more embodiments host operating system 102 is configured to obtain (e.g., pull) policy from the management and monitoring service 104. Some implementations may combine push and pull techniques to obtain policy. The management and monitoring service 104 has two roles. First, the management and monitoring service 104 receives an administrative configuration for individual network resources 122(1), . . . , 122(m) that are generally accessible to a user of the host operating system 102. In one or more embodiments, these network resources are associated with individual levels of trust. For example, an employer may define any network resource that is associated with the employer's website as having a high level of trust. Accordingly, policy for the host operating system 102 indicates that any network resources associated with the employer's website are trusted network resources. The second role of the management and monitoring service 104 is to receive feedback from the host operating system 102 regarding monitored activity associated with individual network resources and to compile that monitored information into a report for an administrator. This compiled report may be used by an administrator to update policy pertaining to trusted network resources for the host operating system 102.
The management and monitoring service 104 may be configured to receive policy configuration data from an administrator of the device that implements the host operating system 102. As discussed herein, policy describes information pertaining to trusted network resources such as trusted websites, trusted network locations, trusted networks, and so on. When the management and monitoring service 104 receives policy from an administrator, the management and monitoring service 104 is configured to send a policy update to a target set of computing devices. The target set of computing devices to which the management and monitoring service 104 sends policy updates is defined by an administrator in accordance with one or more embodiments. For example, in an enterprise environment as discussed above, the management and monitoring service 104 is configured to send policy updates to each computing device associated with the enterprise. Each computing device that receives a policy update is configured to locally store the policy for use when attempting to access network resources.
As discussed in further detail below, the computing device that implements host operating system 102 is configured to dynamically monitor activity associated with accessed network resources 122(1), . . . , 122(m). Monitored activity associated with network resources is updated locally at the host operating system 102 and communicated back to the management and monitoring service 104. In this manner, the management and monitoring service 104 may be continuously updated to provide a user of the host operating system 102 with an accurate list of trusted network resources.
The host operating system 102 also includes a hardware-based virtualized security isolation (HVSI) subsystem 110, a policy manager 112, one or more applications 114, a network filter 116, a container manager 118, and a security subsystem 120. The host operating system 102 also manages one or more containers, illustrated as multiple (n) containers 130(1), . . . , 130(n).
HVSI subsystem 110 is representative of functionality for calling network isolation query application programming interfaces (APIs) to determine if a requested network resource is trusted. These network isolation query APIs are exposed by, for example, the policy manager 112. If HVSI subsystem 110 determines that a requested network resource is trusted, HVSI subsystem 110 allows the requested network resource to be accessed by the host operating system 102. Alternatively, if HVSI subsystem 110 determines that a requested network resource is not trusted, HVSI subsystem 110 causes the host operating system 102 to activate one or more of containers 130(1), . . . , 130(n) and allow the one or more activated containers to access the untrusted network resource. In one or more implementations, an anonymous container 130 is activated for an application regardless of whether or not the application is trusted. Functionality of the HVSI subsystem 110 will be discussed in further detail below. In accordance with one or more embodiments, HVSI subsystem 110 determines whether a requested network resource is trusted by communicating with policy manager 112.
The policy manager 112 is representative of functionality for obtaining and storing one or more policies for the computing device implementing the host operating system 102. For example, in one or more embodiments a policy manager 112 obtains and stores one or more administrative policies that define one or more trusted network resources for the host operating system 102. In accordance with one or more implementations, a policy manager 112 obtains and stores administrative policies from the management and monitoring service 104. Alternatively or additionally, policy manager 112 obtains and stores one or more administrative policies from a remote source, such as from network 108. Additionally or alternatively, policy manager 112 receives and stores one or more administrative policies from a user of the device implementing host operating system 102.
Applications 114 include one or more applications that are executable by one or more processors of the computing device implementing the host operating system 102. For example, applications 114 may include a web browser application. Alternatively or additionally, applications 114 may include applications such as e-mail applications, word processing applications, spreadsheet applications, visual presentation applications, “apps” for mobile devices, and the like.
The network filter 116 is representative of functionality for connecting the device implementing host operating system 102 to a network, such as network 108. Network filter 116 includes at least one physical network interface card and at least one host virtual network interface card. Network filter 116 additionally includes a filter driver, which is configured to intercept requested network resources as they are transmitted from the network 108 to the host operating system 102. These intercepted network resources are then compared by the HVSI subsystem 110 against one or more policies stored in policy manager 112. In this manner, network filter 116 ensures that the host operating system 102 is prevented from accessing any untrusted network resources. Similarly, network filter 116 ensures that one or more of containers 130(1), . . . , 130(n) are unable to access any trusted network resources. For example, in one or more embodiments network filter 116 is configured to change data associated with individual packets of a trusted network resource to ensure that the trusted network resource is accessed only by the host operating system 102 and is prevented from being accessed by any of the one or more of containers 130(1), . . . , 130(n).
The host operating system 102 additionally includes a container manager 118. The container manager 118 manages the scheduling of containers 130(1), . . . , 130(n) in the system 100 and determines which containers 130(1), . . . , 130(n) are run on the host operating system 102 at what times. Container manager 118 is also responsible for activating one or more containers 130(1), . . . , 130(n) for an individual user of the system 100 and for ensuring that other users of the system 100 cannot access the one or more containers 130(1), . . . , 130(n) created for the individual user. Container manager 118 is also configured to collect logs and traces from any one or more created containers 130(1), . . . , 130(n) for telemetry and security indicators. For example, in one or more embodiments, container manager 118 consults anti-virus applications installed on the host operating system 102 to interpret collected information and provides monitored data to the HVSI subsystem 110. Depending on the number of physical processors and/or processor cores in the computing device running the host operating system 102, a single container 130(1), . . . , 130(n) can be run at a time (e.g., in the case of a single processor with a single core) or alternatively multiple containers 130(1), . . . , 130(n) can be run concurrently (e.g., in the case of multiple processors and/or multiple processor cores). Additionally, in one or more embodiments container manager 118 is configured to monitor user configuration changes that are performed within one or more of containers 130(1), . . . , 130(n). For example, container manager 118 is configured to detect changes to user preferences associated with a web site accessed in one of containers 130(1), . . . , 130(n). Host operating system 102 is configured to use these detected changes in the container and apply them to one or more related web sites that are accessed in the host operating system. Additionally, in one or more embodiments, container manager 118 is configured to activate an anonymous container 130 for an application, regardless of whether or not the application is trusted.
Security subsystem 120 is representative of functionality for enforcing security policy on the host operating system 102. Security subsystem 120 is configured to verify a user logging on to a device implementing the host operating system 102, handle password changes for the logged on user, create access tokens for a logged on user, and so on.
Each container 130(1), . . . , 130(n) can be implemented in different manners. One type of container that a container 130 can be implemented as is referred to as a process container. For a process container, the application processes within the container run as if they were operating on their own individual system (e.g., computing device), which is accomplished using namespace isolation. Host operation system 102 implements namespace isolation. Namespace isolation provides processes in a container a composed view consisting of the shared parts of host operating system 102 and the isolated parts of the operating system that are specific to each container such as filesystem, configuration, network, and so forth.
Another type of container that a container 130 can be implemented as is referred to as a virtualized container. For a virtualized container, the virtualized container is run in a lightweight virtual machine that, rather than having specific host physical memory assigned to the virtual machine, has virtual address backed memory pages. Thus, the memory pages assigned to the virtual machine can be swapped out to a page file. The use of a lightweight virtual machine provides additional security and isolation between processes running in a container. Thus, whereas process containers use process isolation or silo-based process isolation to achieve their containment, virtualized containers use virtual machine based protection to achieve a higher level of isolation beyond what a normal process boundary can provide. A container may also be run in a virtual machine using physical memory.
In one or more embodiments, each container 130(1), . . . , 130(n) includes one or more virtual applications 132(1), . . . , 132(n). Individual ones of the one or more virtual applications 132(1), . . . , 132(n) correspond to instances of individual ones of the applications 114 on host operating system 102. Virtual applications 132(1), . . . , 132(n) are thus useable to access untrusted network resources in one or more of containers 130(1), . . . , 130(n) in a similar manner to how one of applications 114 would access a trusted network resource on the host operating system 102.
Having considered an example system for implementing distribution and management of services in virtual environments, consider now an example architecture for the system implementing hardware-based virtualized security isolation in accordance with one or more embodiments.
In the illustrated example, the computing device implementing the system architecture 200 includes the host operating system 102 and the container 130. The host operating system 102 is isolated from any one or more containers 130 to protect the host operating system from attacks or infections that may result from untrusted network resources.
The host operating system 102 is illustrated as including HVSI subsystem 110, policy manager 112, network filter 116, container manager 118, and security subsystem 120. Additionally, the host operating system 102 includes application 202, which may be one of applications 114 illustrated in
The container 130 includes virtual application 206, which is representative of an instance of application 202 included in host operating system 102. The container 130 additionally includes a virtual security subsystem 210, the functionality of which is discussed in further detail below. Additionally, the container 130 includes a logging system 214, which is representative of functionality of content manager 118 to manage and monitor network resource activity within one or more containers 130 activated by the device implementing system architecture 200.
The host operating system 102 and the container 130, although isolated from one another, are communicatively connected via virtual machine bus 216. Virtual machine bus 216 is a communication channel that allows the host and container portions to communicate with one another. Additionally or alternatively, the host operating system 102 and the container 130 are communicatively connected via other means such as a physical network, a virtual network, simple message block (SMB) protocol, or remote procedure call (RPC) interconnections.
Having considered a system architecture for a system implementing hardware-based virtualized security isolation, consider now functionality of individual components illustrated in the host portion and the container portion of system architecture 200.
HVSI Subsystem
HVSI subsystem 110 is representative of functionality for implementing hardware-based virtualized security isolation in the computing device implementing system architecture 200. In order to implement hardware-based virtualized security isolation, HVSI subsystem 110 is configured to communicate with the policy manager 112, the network filter 116, the container manager 118, security subsystem 120, application 202, and any one or more containers 130. In one or more embodiments, HVSI subsystem 110 is automatically launched upon startup of the computing device implementing system architecture 200. Alternatively, HVSI subsystem 110 is launched at other times, such as by HVSI library 204 of application 202 when the application 202 is launched by the host operating system.
When HVSI subsystem 110 is launched, it calls container manager 118 to create a container for a user logged on to the computing device implementing system architecture 200, if a container for the user does not already exist. The container manager 118 will create a random or pseudo-random unique local account credential to use to connect to the container. This local account credential is known only to the host operating system 102 and is used to connect the host operating system 102 to the container. A transaction of the local account credential between the host operating system 102 and the container is transparent to a user of host operating system 102 and prevents malicious attacks or infections from connecting to the container over the host operating system 102's physical network Internet connection. In embodiments where host operating system 102 has multiple users, container manager 118 is configured to create separate containers for individual users. Each separate container has a different random or pseudo-random unique local account credential such that host operating system 102 is restricted from accessing any containers that were not created for a logged-on user. Container manager 118 ensures this container separation by authenticating associated user credentials before permitting accesses to one or more containers. Note that in some embodiments, the user data is settable by policy. For example, the username may be something that is spoofed to look to applications as if it is a real name. In some embodiments, the user information is saved and re-used with new containers to ensure that the user looks consistent to the applications.
HVSI subsystem 110 then instructs container manager 118 to suspend the container until HVSI subsystem 110 detects that an application running on the computing device implementing system architecture 200 is attempting to access one or more untrusted network resources. HVSI subsystem 110 is configured to monitor communications between the host operating system and one or more remote resource locations based on information provided to HVSI subsystem 110 by network filter 116.
When host operating system 102 attempts to access a network resource, HVSI subsystem 110 communicates with the policy manager 112 to determine if the requested network resource is a trusted network resource. If HVSI subsystem 110 determines that the requested network resource is a trusted network resource, HVSI subsystem 110 permits the trusted network resource to be accessed by an application in host operating system 102, such as application 202. Information associated with a network resource that HVSI subsystem 110 may use to determine if the network resource is trusted includes, file type, application type, results of an anti-virus scan of the network resource, a virus signature, email source information, document metadata, URLs, IP addresses, TCP ports, DNS name, hardware device identifiers, or combinations thereof. For example, if HVSI subsystem 110 ascertains that application 202 is requesting to navigate to a particular web page, HVSI subsystem 110 compares information associated with the particular web page with one or more policies from the policy manager 112 and permits the application 202 to access the particular web page in response to determining that the particular web page is trusted. HVSI subsystem 110 determines that the particular web page is trusted, for example, based on one or more of the particular web page's fully qualified domain name (FQDN), root site domain name utilizing the domain name server (DNS), internet protocol (IP) address, or similar uniform resource locator (URL) addressing method. In accordance with one or more embodiments, HVSI subsystem 110 is additionally configured to determine if a network resource is trusted by receiving information from a cloud-based service implemented remotely from computing device 102 that maintains a list of malicious network resources. For example, if HVSI subsystem 110 ascertains that application 202 is requesting to navigate to a particular web page, HVSI subsystem 110 consults a cloud-based service via network 108 to compare the particular web page against a list of potentially malicious network resources stored at the cloud-based service. If the cloud-based service indicates that the particular web site is included in the list of potentially malicious network resources, the particular web page is determined to be untrusted.
Alternatively, if HVSI subsystem 110 determines that a requested network resource is not a trusted network resource, HVSI subsystem 110 causes container manager 118 to activate container 130 to handle the untrusted network resource. Based on the type of application that is requesting the untrusted network resource in the host system, HVSI subsystem 110 instructs the container manager 118 to launch a virtual version of the application within container 130. For example, if HVSI subsystem 110 determines that application 202 is requesting access to an untrusted network resource, HVSI subsystem 110 instructs container manager 118 to create the virtual application 206 within container 130. In this manner, container 130 is configured to interact with one or more untrusted network resources just as the host operating system 102 would interact with one or more trusted network resources. In one or more embodiments, container 130 is activated by and implemented on the device implementing host operating system 102. Alternatively, container 130 is activated by and implemented on a device that is different from the device implementing host operating system 102. Alternatively, container 130 is implemented by a device that is different from the device implementing operating system 102 but is activated by the device implementing host operating system 102.
In order for a user of the computing device implementing host operating system 102 to view and otherwise interact with any one or more untrusted network resources that are accessed by a virtual application within container 130, HVSI subsystem 110 is configured to communicate with container 130 to cause display of an interface for the virtual application 206. For example, in one or more embodiments HVSI subsystem 110 uses a remote applications integrated locally (RAIL) mode of a remote desktop protocol (RDP) using virtual machine bus 216. In this manner, host operating system 102 may display an interface of virtual application 206 at a display device of the device implementing host operating system 102. In one or more embodiments, the interface is configured so that a user of host operating system 102 perceives the interface to be part of the host operating system itself. Alternatively, HVSI subsystem 110 is configured to display an interface corresponding to virtual application 206 with a visual indication that the displayed interface corresponds to one or more untrusted network resources. In other embodiments, the HVSI subsystem 110 uses an X Window System or an alternative remote desktop implementation to display an interface corresponding to virtual application 206.
After container 130 is activated by container manager 118, network filter 116 filters all network resource calls from host operating system 102 and container 130. For example, HVSI subsystem 110 instructs network filter 116 to block all calls to untrusted network resources from host operating system 102 and allow only trusted network resource calls from host operating system 102. Similarly, HVSI subsystem 110 instructs network filter 116 to allow all calls to untrusted network resources from container 130 and block all calls to trusted network resources from container 130.
HVSI subsystem 110 is configured to instruct container manager 118 to monitor all activity associated with untrusted network resources that are accessed by container 130. When HVSI subsystem 110 receives an indication from container manager 118 that all instances of virtual applications 206 running in container 130 are terminated, HVSI subsystem 110 terminates any connection between host operating system 102 and any containers 130 being accessed by host operating system 102. HVSI subsystem 110 will then either suspend or terminate the one or more containers 130. For example, in one or more embodiments when HVSI subsystem 110 ascertains that processing of virtual application 206 has ended, HVSI subsystem 110 terminates a connection with container 130 and suspends the container to wait for further requests for untrusted network resources. Alternatively, if HVSI subsystem 110 determines that a user has logged off the device implementing system architecture 200, HVSI subsystem 110 terminates any one or more containers 130 that were activated by host operating system 102.
By communicating with components of host operating system 102, such as policy manager 112, network filter 116, container manager 118, and security subsystem 120, HVSI subsystem 110 is configured to determine if a requested network resource is trusted, restrict opening of the untrusted network resources to an isolated container, and manage one or more processes running within the isolated container. This allows HVSI subsystem 110 to perform hardware-based virtualized security isolation techniques in order to protect the device implementing host operating system 102 from kernel level attacks or infections that may be caused by untrusted network resources.
Having considered an example system architecture of a host operating system that performs hardware-based virtualized security isolation, consider now individual components of a host operating system in accordance with one or more embodiments.
Policy Manager
Policy manager 112 represents functionality of host operating system 102 for obtaining and storing one or more policies for a computing device implementing the host operating system. For example, policy manager 112 is configured to obtain and store one or more policies from the management and monitoring service 104 illustrated in
For example, a policy object may identify whether host operating system 102 is allowed to implement virtual applications in isolated containers, such as container 130. If the corresponding security parameter for this policy object indicates that host operating system 102 is allowed to implement virtual applications and isolated containers, then the host operating system may open one or more untrusted network resources in virtual application 206 of isolated container 130. Alternatively or additionally, a policy object indicates certain virtual applications that are allowed to open in an isolated container. The corresponding security parameter for this policy object may identify one or more specific applications that are allowed to be virtually opened in an isolated container. Alternatively or additionally, a policy object indicates what host operating system 102 may copy between isolated container 130 and host operating system 102 itself. The corresponding security parameter specifies one or more file types that may be copied in between isolated container 130 and host operating system 102. Alternatively or additionally, a policy object indicates print settings for virtual applications opened in isolated container 130. The corresponding security parameter for this policy object indicates whether virtual application 206 running in isolated container 130 may print and, if so, one or more printers, applications, or file types to which virtual application 206 is allowed to print. Alternatively or additionally, a policy object indicates whether network traffic for virtual application 206 is allowed. The corresponding security parameter for this policy object may specify one or more virtual applications for which network traffic is allowed within an isolated container. Alternatively or additionally, a policy object indicates whether background tasks for virtual application 206 are allowed. The corresponding security parameter specifies one or more virtual applications for which background tasks are allowed within isolated container 130. Alternatively or additionally, a policy object indicates whether the virtual application 206 running in the container is allowed to leverage one or more hardware resources of the computing device implementing host operating system 102, such as the computing device's GPU for graphics acceleration.
The following table provides an example set of policy objects and corresponding security parameters, such as those discussed above. In accordance with standard security procedures, this example policy has a default deny rule implied, which is not illustrated. It is to be appreciated and understood however, that the discussed policy objects and corresponding security parameters are exemplary and not exhaustive in scope.
When host operating system 102 starts up, HVSI subsystem 110 contacts policy manager 112 to obtain a list of trusted network resources for the host operating system, along with any policy objects and corresponding security parameters. HVSI subsystem 110 aggregates these trusted network resources, policy objects, and corresponding security parameters and applies this aggregated policy to host operating system 102. In one or more embodiments, this aggregated policy is queried each time host operating system 102 requests to perform an action or attempts to access a network resource. For example, when host operating system 102 requests to open application 202 that is included in the security parameter corresponding to the policy object “Virtual Applications for Container Isolation”, HVSI subsystem 110 causes host operating system 102 to open a virtual version of that application 206 in isolated container 130.
HVSI subsystem 110 is additionally configured to monitor activity within one or more of isolated container(s) 130 to ensure that the container(s) do not gain access to any trusted network resources. For example, if a virtual version of a web browser is running in isolated container 130, and HVSI subsystem 110 detects that the virtual web browser is attempting to access a network resource that is indicated by the policy manager 112 as a trusted network resource, HVSI subsystem 110 may prevent the virtual web browser from opening or otherwise accessing this trusted network resource and instead cause the trusted network resource to be opened within a corresponding web browser on host operating system 102. By restricting access and opening of trusted network resources to host operating system 102 and restricting access and opening of untrusted network resources to one or more isolated containers 130, HVSI subsystem 110 ensures that trusted network resources are not corrupted by any untrusted network resources.
In addition to receiving the list of trusted network resources, policy objects, and corresponding security parameters from the policy manager 112, host operating system 102 is configured to observe one or more local events that could impact policy for the host operating system. For example, consider a scenario where a virtual web browser is running within isolated container 130. HVSI subsystem 110 monitors the behavior of each network resource accessed by the virtual web browser within isolated container 130. When the virtual web application navigates to an untrusted network resource, downloading the untrusted network resource may cause a registry of container 130 to be written to in an unexpected manner. Using container manager 118, which is discussed in further detail below, HVSI subsystem 110 obtains data from container 130 and calculates an updated local policy for the untrusted network resource. For example, in one or more embodiments HVSI subsystem 110 updates local policy for the untrusted network resource by disabling printing and copying settings associated with the untrusted network resource. HVSI subsystem 110 is then configured to aggregate this obtained data and report the obtained data to a remote service, such as the management and monitoring service 104 illustrated in
In one or more embodiments, HVSI subsystem 110 implements an independent host-based policy engine that responds to local activity at host operating system 102 and container 130. This independent host-based policy engine reduces round trips to the management and monitoring service 104, enabling the management and monitoring service to manage many clients. In one or more embodiments, policy manager 112 obtains a template or a signature from management and monitoring service 104. Policy manager 112 provides this template or signature to HVSI subsystem 110. When container 130 is activated, HVSI subsystem 110 computes the required policy based on a pattern from the policy template or signature that it matches to activity observed in container 130. For example, if a virtual web application is running in container 130, and a network resource the virtual web application is trying to access as a URL matches a pattern in the policy template, HVSI subsystem 110 calculates a risk level and updates the policy. This dynamically results in a specific action applied to the virtual application in container 130, such as an allow action, a block action, or a redirect action. In this embodiment, the policy is dynamic, offloading local assessment and policy from the management and monitoring service 104 to HVSI subsystem 110.
As an alternative example, consider a scenario where a user downloads and installs a new application from an untrusted web site within container 130. In this example, HVSI subsystem 110 assesses the downloaded application against existing policy, and calculates policy that applies to the downloaded application in isolated container 130. In one or more embodiments, this calculated policy is based on one or more policy objects and corresponding security parameters of similar applications. For example, if the downloaded application is an e-mail application, HVSI subsystem 110 identifies one or more policy objects and corresponding security parameters pertaining to other e-mail applications and applies similar policy settings for the downloaded e-mail application. HVSI subsystem 110 is configured to monitor activity associated with the downloaded application within container 130 and is configured to recalculate local policy based on this observed activity. Additionally or alternatively, information describing observed activity of any one or more downloaded applications or accessed network resources within container 130 is aggregated and communicated to a remote service, such as the management and monitoring service 104 illustrated in
In order to enforce policy for host operating system 102, HVSI subsystem 110 employs one or more network filters, such as network filter 116.
Network Filter
Network filter 116 is representative of functionality for intercepting and inspecting ingoing and outgoing network traffic for host operating system 102. Network filter 116 has enforcement functionality for network traffic including forwarding, blocking and/or modifying network traffic, among other capabilities. For example, network filter 116 is configured to intercept and inspect all network traffic and data communication in between host operating system 102 and any one or more isolated containers 130. Similarly, network filter 116 is configured to intercept and inspect all network traffic and data communication in between host operating system 102 and any remote resource locations accessed via network, such as network 108 illustrated in
Using policy received from policy manager 112, HVSI subsystem 110 interfaces with network filter 116 to ensure that container 130 is not able to access trusted network resources. Similarly, HVSI subsystem 110 interfaces with network filter 116 to ensure that host operating system 102 is not able to access or otherwise open any one or more untrusted network resources. In one or more embodiments, network filter 116 is configured to change data of individual packets associated with trusted network resources to ensure the trusted data remains on host operating system 102 and does not flow to container 130. As discussed in further detail below, in a proxy authentication scenario, the network filter 116 injects credential information into network traffic to ensure proxy traversal and prevent credentials from leaking into or otherwise being accessed by the container. In some embodiments, the network filter 116 validates that network traffic is originating or terminating at a network resource that was queried during DNS lookup. To accomplish this, identifiers based on allowed network resources are plumbed inside the container and associated with one or more network resource names. A network stack in the container includes these identifiers in the network traffic. The network filter 116 validates whether an identifier matches a network resource name. If the validation is successful, the traffic is forwarded, if it fails, the traffic is dropped. In some embodiments, the network filter 116 strips the identifier from forwarded network traffic.
In accordance with one or more embodiments, network filter 116 is implemented as a virtual switch extension. Alternatively, network filter 116 is implemented as any module that has multiple abilities including to intercept, inspect, forward, modify, and block network traffic. In other embodiments the network filter is built into firewall or other security software of the computing device implementing host operating system 102. In accordance with one or more embodiments, network filter 116 is installed on host operating system 102 when policy is received at the host operating system. For example, network filter 116 may be installed when the policy manager 112 receives policy from the management and monitoring service 104 illustrated in
In some embodiments, the network filter 116 enforces which network interface is used to connect to a resource. For example, while host operating system 102 is in an enterprise, security is assumed. In the enterprise, application 202 running on host operating system 102 may simply use any available physical interface (e.g. Ethernet, Wi-Fi, etc.). However, when the host operating system 102 is on a public network (e.g. outside the enterprise at a coffee shop's public Wi-Fi), the network filter 116 may only allow application 202 and other applications running on host operating system 102 to use a certain network interface, such as a VPN interface, improving network security. In some configurations, network filter 116 allows one or more applications running in container 130 to access the public network without using VPN. In embodiments where one network interface is isolated for host operating system 102 communications and a different network interface is isolated for container 130 communications, network filter 116 is configured to provide an indication to a network stack of container 130 that network communications for the container are isolated to the different network interface.
HVSI subsystem 110 calls network filter 116 and causes network filter 116 to attach itself to network ports of the device implementing host operating system 102. Once network filter 116 is attached to the network ports, it is able to monitor, filter, and/or block network traffic. In one or more embodiments, the network filter 116 includes a local DNS server to further enforce policy for host operating system 102. For example, in one or more embodiments network filter 116's DNS server maps network resources to corresponding IP addresses to verify an origin of individual network resources. In one or more implementations, the network filter 116 includes one or more input/output control systems (IOCTLs) that are configured to allow or block a network traffic for both host operating system 102 and any one or more containers 130. In other implementations this configuration is performed through an API, a file, or a command shell.
Network filter 116 is configured to monitor network traffic (e.g., HTTP traffic) to ensure that host operating system 102 and container 130 are not accessing network resources that are not allowed for the respective host operating system or container. In order to monitor HTTP traffic, network filter 116 performs HTTP header inspection with one or more web proxies facilitating network traffic between host operating system 102 and/or any one or more isolated containers 130, such as web proxy 106 illustrated in
To support network communication functions in proxied environments and across network changes, network filter 116 includes a network address translator (NAT). The NAT provides container 130 with a private network and a gateway to reach a network outside host operating system 102. In accordance with one or more embodiments, the NAT is configured to forward outside network proxy configuration and forward outside network change notifications to host operating system 102. For example, in one or more embodiments network filter 116 uses a NAT to forward network change notifications to host operating system 102 when a network connection status changes, such as when a Wi-Fi (IEEE 802.11) Network adapter leaves or enters range of a Wi-Fi Network. Additionally, network filter 116's NAT is configured to emulate an outside network identity to ensure that container 130 can identify different networks correctly. For example, the NAT can take the media access control (MAC) address of the host's external network gateway and re-use it as the private network gateway MAC address provided by NAT. This ensures that container 130's HTTP software will appropriately align the HTTP cache and ensure proxy discovery is not duplicated when reconnecting to the same network. By emulating an outside network identity, network filter 116's NAT significantly improves network reconnect performance and improve user experience for a user of host operating system 102. Additionally, network filter 116's NAT is configured to forward “low-power connected standby” settings to host operating system 102 for one or more virtual applications 206 that are running in one or more isolated containers, such as container 130. This enables host operating system 102 to keep alive any virtual applications 206 running in one or more active isolated containers 130. In one or more embodiments, functionality of the NAT is offloaded to a different component of host operating system 102. For example, provisioning a private network and gateway to reach a network outside host operating system 102, forwarding network change notifications, emulating an outside network identity, and forwarding low-power connected standby settings can be performed by one or a combination of network filter 116, HVSI subsystem 110, or container manager 118.
HVSI subsystem 110 is configured to interact with network filter 116 to perform web proxy authentication in accordance with one or more embodiments. For example, many enterprise systems use one or more web proxies to control Internet access for individual users of the enterprise. These web proxies require authentication before allowing individual users or applications to access network resources, such as web sites, by prompting user credentials such as a username and associated password. Accordingly, network filter 116 is configured to identify a web proxy that is required to facilitate access to a web site, such as web proxy 106 illustrated in
In order to provide a seamless user experience for virtual applications 206 running in container 130 that require web proxy authentication, HVSI subsystem 110 is configured to provide user credentials to a web proxy from host operating system 102 without providing the user credentials to container 130. HVSI subsystem 110 is configured to provide user credentials to a web proxy for virtual application 206 running in container 130 by implementing virtual security subsystem 210 within the isolated container. Virtual security subsystem 210 is configured to interface with security subsystem 120 of host operating system 102. For example, in one or more embodiments HVSI subsystem 110 detects that virtual web application 206 is calling a network resource that requires web proxy authentication. HVSI subsystem 110 is configured to implement virtual security subsystem 210 within the isolated container so that the virtual security subsystem 210 can interface with security subsystem 120 of host operating system 102. Communication between virtual security subsystem 210 and security subsystem 120 may be performed over the connection established by HVSI subsystem 110, such as via virtual machine bus 216.
When virtual web application 206 in container 130 attempts to access a network resource via a web proxy, the web proxy returns with a challenge for user credentials. In this scenario, virtual security subsystem 210 is configured to call security subsystem 120 of host operating system 102 to provide authentication to the web proxy. In response to receiving this call, security subsystem 120 is configured to generate a dummy credential blob that indicates ownership of the user credentials without actually containing the user credentials within the credential blob. As discussed herein, a dummy blob may also be referred to as a pseudo-authentication of the user credentials. Security subsystem 120 returns the generated dummy credential blob to virtual security subsystem 210. Virtual security subsystem 210 then provides the dummy credential blob to virtual web application 206 so that the virtual web application can embed the dummy credential blob in an HTTP response to the web proxy. In this manner, container 130 is configured to prove ownership of user credentials without receiving the actual user credentials from host operating system 102. In accordance with one or more embodiments, proof of credential ownership within the dummy blob is performed by applying a hash security function to the actual credentials and including the hashed credentials within the dummy blob. This ensures that user credentials are not compromised by any untrusted network resources that may be running in container 130.
Alternatively, if virtual security subsystem 210 forwards a web proxy request for user credentials to security subsystem 120 of host operating system 102, security subsystem 120 is configured to generate two credential blobs. The first credential blob generated by security subsystem 120 is a dummy credential blob as described above. The second credential blob generated by security subsystem 120 contains the actual user credentials requested by the web proxy. In this scenario, the dummy credential blob is provided to the virtual security subsystem 210 in container 130, and the blob containing the actual user credentials is provided to network filter 116 in host operating system 102. As discussed above, virtual web application 206 is configured to receive the dummy credential blob from virtual security subsystem 210 and embed the dummy credential blob in an HTTP response to the web proxy. Because all network traffic from both host operating system 102 and container 130 are filtered through network filter 116, network filter 116 is configured to intercept the HTTP response from the container and replace the dummy blob with the actual user credential blob before transmitting the HTTP response to the web proxy. In accordance with one or more embodiments, where host operating system 102 is functioning in a nested computing environment, this credential blob replacement may be performed multiple times, at each layer of the nested environment. Alternatively, in one or more embodiments, network filter 116 plumbs allowed network resource identifiers within container 130 to validate that network traffic is originating and terminating at a network resource that was queried during DNS lookup, as discussed above.
When HVSI subsystem 110 determines that host operating system 102 is attempting to access an untrusted network resource, using policy manager 112, network filter 116, and security subsystem 110 as discussed herein, HVSI subsystem 110 communicates with container manager 118 to manage and monitor one or more containers 130 for accessing the untrusted network resource.
Container Manager
Container manager 118 is responsible for activating one or more containers 130 that are isolated from host operating system 102 to access untrusted network resources. As discussed herein, activating a container such as container 130 includes creating one or more new containers or resuming running of one or more suspended containers. In accordance with various implementations, container manager 118 is further configured to anonymize generation of the one or more containers 130. Container manager 118 is additionally configured to activate one or more containers for an individual user logged into host operating system 102 and ensure that any other users of the host operating system are restricted from accessing the activated one or more containers for the individual user. Container manager 118 ensures a mapping of the user logged into host operating system 102 to the container 130. In some embodiments in which there are multiple users of host operating system 102 and multiple containers, the container manager 118 is configured to see a logged-on user's identity and directly associate that with one or more corresponding containers. This restriction prevents other users from viewing or otherwise interacting with the containers.
Container manager 118 is further configured to collect logs and traces describing activity within container 130. Container manager 118 is configured to use these logs and traces to monitor container usage for telemetry and security indicators. In accordance with one or more embodiments, container manager 118 consults with local applications installed on host operating system 102, such as an antivirus application, in order to interpret any security issues associated with monitored activity in container 130. Container manager 118 is configured to aggregate this monitored information and provide the monitored information to HVSI subsystem 110. Alternatively or additionally, container manager 118 is configured to provide this monitored information to one or more remote sources, such as management and monitoring service 104 illustrated in
When host operating system 102 starts up, HVSI subsystem 110 determines whether policy is present. In one or more embodiments, HVSI subsystem 110 determines whether policy is present by communicating with policy manager 112, as discussed herein. If HVSI subsystem 110 determines that policy is present on host operating system 102, container manager 118 is configured to activate container 130 to handle any untrusted network resources that are requested by the host operating system. Container manager 118 is configured to activate container 130 by communicating with host operating system 102 to determine if a container base image exists. If container manager 118 determines that a container base image does not exist, container manager 118 is configured to create a container base image. If container manager 118 determines that a container base image does exist, or after container manager 118 creates a container base image, container manager 118 waits for a user to log onto host operating system 102.
A container base image contains information required to create and activate an isolated container that includes its own operating system, such as container 130. For example, in one or more embodiments a container base image contains information describing how host operating system 102 is to set registry settings for a container. Information regarding registry settings is required because some virtual applications that are opened inside container 130 behave differently than a version of the application that would be opened on host operating system 102. Additionally or alternatively, a container base image includes information describing how to create a user account within a virtual application executed in container 130. Additionally or alternatively, the container base image includes information regarding an amount of allocated resources, such as memory, processors, disks, or networks, which may be required by container 130 when active.
When a user logs onto host operating system 102, container manager 118 determines whether a container corresponding to the container base image exists. If container manager 118 determines that a container does not exist for the container base image, container manager 118 may create a container, such as container 130. To ensure that a container base image accurately represents the host operating system 102, container manager 118 is configured to invalidate any existing container base images and create one or more new container base images after an operating system update. In this manner, container manager 118 ensures that a container base image includes any updated host operating system binaries, thereby keeping containers created from the container base image up to date with the host operating system 102. In the event of a host operating system 102 update, container manager 118 is configured to either force close any open containers or wait until user activity in the container has ceased to delete the container base image and create a new container base image. After creating the container, container manager 118 places the container into a suspended mode. When a container is in a suspended mode, the container consumes fewer resources of the device implementing host operating system 102, thereby reducing resource overhead. Container manager 118 is configured to maintain one or more isolated containers 130 in a suspended mode until host operating system 102 requests access to one or more untrusted network resources.
When HVSI subsystem 110 detects that host operating system 102 is requesting access to one or more untrusted network resources, HVSI subsystem 110 instructs container manager 118 to activate one or more suspended containers in order to handle the one or more untrusted network resources. In one or more embodiments, the one or more containers are hosted on the computing device that is implementing host operating system 102. Alternatively, at least one of the one or more containers may be hosted on a computing device that is remote from the computing device implementing host operating system 102. In a scenario where a container is hosted on a different computing device, container manager 118 is configured to communicate with the different computing device to manage and monitor the remote containers. Because the container manager 118 can activate a suspended container faster than it can create a container, maintaining one or more suspended containers allows host operating system 102 to quickly respond to requests for untrusted network resources.
In response to determining that host operating system 102 is requesting access to one or more untrusted network resources, container manager 118 is configured to identify an application on the host operating system that is requesting the untrusted network resource. Container manager 118 is configured to launch a virtual version of the application within container 130 to handle the untrusted network resource. After container manager 118 activates a virtual version of the application within container 130, HVSI subsystem 110 is configured to remote into container 130 to display an interface of the virtual application at a display of the device implementing host operating system 102.
Container manager 118 is configured to communicate with HVSI subsystem 110 to ensure that appropriate hardware virtualization technology exists on host operating system 102, and in container 130, if the container is hosted by a remote computing device. For container manager 118 to function properly, the container manager 118 is configured to verify that host operating system 102's application programming interfaces (APIs) are available to manage isolated container lifecycles and associated network stacks.
Container manager 118 is configured to monitor activity within container 130 using logging system 214. In this manner, container manager 118 is configured to detect any suspicious behavior of a network or network resource that is accessed within container 130, whether container 130 is taking up too much disk space, and so on. Based on information obtained from logging system 214, container manager 118 is able to inform HVSI subsystem 110 how to manage one or more containers 130. For example, in one or more embodiments container manager 118 ascertains that access to one or more untrusted network resources within container 130 has completed and communicates this information to HVSI subsystem 110. In response to receiving this information, HVSI subsystem 110 places container 130 into a suspended mode until it is subsequently needed to handle an additional untrusted network resource.
Container manager 118 is also configured to monitor and determine when a user of host operating system 102 logs off. In response to determining that a user of host operating system 102 has logged off, container manager 118 provides this information to HVSI subsystem 110. HVSI subsystem 110 is configured to delete one or more containers 130 in response to the user logging off. As discussed herein, deleting a container also clears any information included within the container.
Container manager 118 is also configured to share DNS and Hypertext Transfer Protocol (HTTP) information from the host operating system 102 to improve web browsing performance or other network activity within the one or more of the isolated containers. In one or more embodiments, container manager 118 maintains a cache of DNS queries made from earlier instances where container 130 accessed network resources, as well as HTTP data such as Internet data files or web site cookies that enable future requests in a container to access untrusted web sites to remember one or more of previous user preferences, configurations, or settings.
In addition to receiving information regarding monitored activity within container 130 from container manager 118, HVSI subsystem 110 is also configured to receive information regarding container activity from one or more HVSI libraries 208.
HVSI Library
As discussed herein, an HVSI library is a small, lightweight, asynchronous library, which is configured to be linked either statically or dynamically within an application. For example, in the illustrated system architecture 200 of
When a user of host operating system 102 attempts to open a network resource via application 202, HVSI library 204 communicates information regarding the requested network resource to HVSI subsystem 110. HVSI subsystem 110 compares this information against one or more policies obtained from policy manager 112 to determine whether the requested network resource is a trusted network resource. If HVSI subsystem 110 determines that the requested network resource is a trusted network resource, HVSI subsystem 110 allows application 202 to access the requested network resource. Alternatively, if HVSI subsystem 110 determines that the requested network resource is not a trusted network resource, HVSI subsystem 110 forwards the untrusted network resource to virtual application 206 in container 130.
Virtual HVSI library 208 in container 130 is configured to intercept network resource requests from virtual application 206 and communicate information regarding the requested network resources to HVSI subsystem 110. HVSI subsystem 110 is similarly configured to compare this information against any policies for host operating system 102 to ensure that no trusted network resources are provided to container 130. In one or more embodiments, a virtual application will not link to virtual HVSI library 208 to ensure compatibility. In these embodiments, logging system 214 and network filter 116 operate to intercept network resource requests from the virtual application and communicate information regarding the requested network resources to HVSI subsystem 110.
Having considered a system architecture for a system implementing hardware-based virtualized security isolation to protect a computing device from attacks or infections associated with untrusted network resources, consider now example procedures in accordance with one or more embodiments. Note that while this specification provides a system architecture for hardware-based virtualized security isolation, additional systems may also be configured to leverage the techniques discussed herein, such as server and cloud systems.
Distribution and Management of Services in Virtual Environments
Distribution and management of services in virtual environments is described herein. In one or more implementations, container manager 118 implements a service distribution and management model in which system services and applications are seamlessly distributed across multiple containers which each implement a different runtime environment. Compared to existing container models, this service distribution and management model provides a similar level of service to applications but significantly reduces the overhead of each runtime environment such that guest operating systems of the containers use fewer hardware resources.
In order to achieve a lightweight runtime environment and to reduce complexity, the service distribution and management model separates each service into two components: a service provider and a client stub. Both the service provider and the client stub can be implemented in separate containers or they can be implemented in the host runtime environment. Thus, if a particular container needs to access a service, the container hosts a client stub of the service which is configured to communicate with a service provider which may be running in a different container or in the host runtime environment. Notably, by separating services into a client stub and service provider, the service distribution and management model enables a particular service to be shared across different containers and runtime environments. For example, a single service provider can be implemented in a first container and shared by multiple different client stubs that are each implemented in separate containers.
As an example, consider
As described herein, service provider 302 and client stub 306 are each associated with a service. Such services may include, by way of example and not limitation, active directory services, application layer gateway services, application management services, browser services, distributed link tracking services, distributed transaction coordinator services, DNS clients, event logs, extensible authentication protocols, indexing services, internet connection sharing services, network location awareness services, network store interface services, NTLM security support providers, peer name resolution protocols, plug and play services, printer spooler services, remote procedure calls, routing and remote access services, secondary logon services, security accounts managers, system event notification services, task schedulers, audio services, firewall services, scanner and camera input services, timer services, update services, or messaging services.
In order to configure and monitor the arrival and departure of services, the container manager 118 may utilize a “connection based” service distribution and management model or a “centralized” service distribution and management model. In a “connection based” model the communication parameters are configured on per connection basis and the initiator of the communication is responsible for the configuration. An example of this type of configuration is socket communication. In a “centralized” model the communication parameters are configured in a centralized way based on set of rules and policies. An example of this type of configuration is Windows Defender by Microsoft®.
As an example of a centralized service distribution and management model, consider
In order to access a service, the client requests access to that service using the client stub 306. The client request from client stub 306 is received and handled by the host service control manager 402, which validates the client request against a set of security rules and policies 404. The host service control manager 402 enforces the security rules and policies 404 in order to determine whether a client or runtime environment is permitted to access a particular service. The security rules and policies 404 may be stored as a part of the host service control manager 402, separately on the host operating system 102, or in some other location such as a file server or cloud-accessible storage.
If the host service control manager 402 determines that the client or runtime environment is permitted to access the service, then the host service control manager 402 grants access to the client. The host service control manager 402 then checks the availability of the service provider 302, and if the service provider 302 is available, the host service control manager 402 returns connection information to the client which enables the client and the service provider 302 to communicate over a direct connection 406. Alternately, if the host service control manager 402 determines that the service provider 302 is not available, then the host service control manager 402 may start a new instance of the service provider 302 in either the host runtime environment 400 or in a new runtime environment using the functionality provided by a host compute service 408.
In one or more implementations, the host service control manager 402 is configured to manage the service providers 302 based on demand. If there is no demand for a particular service provider 302, then the host service control manager 402 may terminate the particular service provider 302 to save system resources.
In some cases, containers can be employed to support many different client runtime environments. In order to efficiently manage multiple different client runtime environments implemented at the same time, the service distribution and management model may enable multiple instances of service providers 302 and/or multiple instance of the host service control manager 402. In this case, each runtime environment and container may be pre-provisioned to a specific service provider 302 and host service control manager 402. This may be pre-determined through host service control manager capacity planning and stored in the security rules and policies 404.
The service distribution and management model provides services that are discoverable and highly available to the processes that depend on them.
The service endpoint 502 monitors utilization of service providers 302 and host service control manager 402 instances. When service providers 302 or host service control manager 402 instances do not meet performance thresholds, the service endpoint 502 contacts the host compute service 408 to add another service provider 302 or host service control manager 402 instance. When contacting the host compute service 408, the host service control manager 402 may query the security rules and policies 404 to ensure that the new request conforms to the security rules and policies 404.
In one or more implementations, a service provider 302 may be configured with additional attributes such as a special set of services that it hosts, or a group of client stubs 306 that it services. When this is true, the service endpoint 502 can associate these attributes with the service provider 302, while also monitoring the service provider 302 and contacting the host compute service 408 to request additional instances of the host service control manager 402 or service providers 302. The additional attributes of the service provider 302 may also be added to the security rules and policies 404. It is important to note that some distributed deployments of containers may span multiple host runtime environments. This will depend on service requirements such as latency and throughput, and the ability for the infrastructure to meet these requirements.
In this example, the client runtime environment 308 implemented in container 310 includes a client stub 306 which is associated with a component object model (COM) 602 service, a client service control manager (service control manager) 604, a remote procedure call (RPC) 606, and a client registry 608. The service runtime environment 304 implemented in container 305 includes a service provider 302 that is associated with the component object model 602 service, a server service control manager (service control manager) 610, a remote procedure call (RPC) 612, and a server registry 614.
In this example, when the client runtime environment 308 is created in container 310, the client registry 608 is configured such that the client service control manager 604 knows how to access the Host service control manager 402 to ask for access to services. For each COM 602 service, there is configuration information in HKEY_CLASSES_ROOT\CLSID\{CLSID} and HKEY_CLASSES_ROOT\AppID\{CLSID}. The Client Registry 608 is populated with information about the services that it is allowed use, but does not include information regarding services it is not permitted to access. A host Registry 616 is configured such that the host service control manager 402 knows what service providers 302 it is allowed to manage.
When a new service provider is registered in the host registry 616, the host service control manager 402 updates the CLSID Registration Database while also handling the client request for an instance of a COM object. A client requests an interface pointer to a COM object from the COM Library by calling a function such as CoCreateInstance with the CLSID of the COM object. The COM Library queries host service control manager 402 to find the server that corresponds with the requested CLSID. The host service control manager 402 uses the CLSID Registration Database and locates the server and requests the creation of the COM object from the class factory that is provided by the server. If the service is not started service control manager may decide to use the host compute service 408 to start a new service runtime environment that hosts the requested service provider. If successful, the COM Library returns an interface pointer to the client. The client is then able to communicate directly with the service provider 302.
In more detail, consider the following example in which the client stub of the COM service requests access to a service. First, client stub 306 requests access to a service by calling CoCreateInstance({CLSID}). This request is handled by the Client service control manager 604 which uses the client registry 608 and the RPC 606 to connect to the host service control manager 402 (e.g., over VmBus). Next, the client service control manager 604 passes the service {CLSID} to the host service control manager 402. Based on the security rules and policies 404, the host service control manager 402 either accepts or denies the request to access the service. If access is granted, then the host service control manager 402 checks the host registry 616 to find out how to provide the service that corresponds to {CLSID}. If the service is already up and running, then the host service control manager 402 may decide to reuse that instance of the service provider 302. This way the host service control manager 402 can perform load balancing functions. However, if the host service control manager 402 decides to start a new instance of the service provider 302, then the host service control manager 402 creates a new service runtime environment in a new container, injects and starts the service provider 302 in the new service runtime environment, and returns connection information to the Client service control manager 604. Client service control manager 402 then gives the connection information to the Client Stub 604, and the COM 602 service is instructed how to connect directly to the service provider 302. Notably, special care must be taken of the lifetime of the new runtime environment because the proposed design introduces inter-container dependencies. However, using the IUnknown interface (AddRef and Release) the service provider 302 knows when its reference count goes down to zero. In this case the service provider 302 can decide to shut itself down to save system resources. Thus, the described techniques enable existing COM clients and COM Service Providers to communicate seamlessly across different runtime environments.
Notably, running service providers 302 in separate runtime environments provides increased security through isolation. This design protects not only the host runtime environment from kernel attacks and exploits but it also ensures service availability. For example, an exploit of one service provider will not cause denial of service by another service provider. Additionally, running clients in separate runtime environments provides a great platform for friendly multi-tenant hosting. Running just small stubs and sharing the services leads to lightweight runtime environments, higher densities and opportunities for cost reductions.
The security rules and policies 404 may be enforced in a variety of different locations, including the host runtime environment, guest runtime environments, or at the host service control manager 402. The security rules and policies 404 may also include one or more of the following attributes: container identifier, container group, service type, process ID, and/or object ID
In some mixed deployments, such as in a public cloud or shared hosting there are potentially hostile parties sharing the same infrastructure. Here, the client runtime environment 308 may not want other entities, such as the host runtime environment or other client runtime environments, to be able to access, modify, or view communications between services. Thus, in one or more implementations VPN may be used to protect communications between the client stubs and service providers. In other implementations, proprietary authorization and cryptographic methods may be used to protect communications between clients and service providers. Provisioning for this may be created at the time of the guest operating system image, or provided by a provisioning service such as Lightweight Directory Access Protocol (LDAP) or Mobile Device Management (MDM).
In some mixed deployments, the client may require full control of the host service control manager and the service provider. In this case, the host service control manager and the service provider may be decoupled from the host runtime environment. As an example, consider
In one or more implementations, monitoring data is acquired from one or more service endpoints 502. Activities of client management service 804 may include measuring various aspects of service availability (e.g. responsiveness, capacity, and so forth) and in response, the client management service 804 may add more resources such as one or more service providers 302. Activities of client management service 804 may also include deallocating resources in the event of overprovisioning. Service availability measurements may be collected over a time interval, and the client management service 802 may be provisioned with capacity planning models to automate this process. One or more implementations may locally calculate capacity planning models based on a set of measurements.
As many public clouds host multiple tenants, it is probable that there will be multiple instances of this scenario deployed on the same host runtime environment infrastructure. In one or more implementations, distributed deployments may span multiple host runtime environments. This will depend on service requirements such as latency and throughput, and the ability for the infrastructure to meet these requirements. In one or more implementations, supporting components may cross ownership and/or administrative boundaries. For example, instances of service stub 306 may have commercial subscriptions to a hosted infrastructure. Information about a user's subscription will be incorporated into rules and policies 404. The rest of the system will work as described above.
Example Procedures
At 902, a service control manager configured to distribute and manage services across container is provided in a host runtime environment. For example, host service control manager 402 is provided in host runtime environment 400 and is configured to distribute service across containers.
At 904, a request to access a service is received at the service control manager. The request is received from a client stub of a client implemented in a client runtime environment of a first container. For example, the host service control manager 402 receives a request from a client stub 306 of a client implemented in a client runtime environment 308 of a container 310.
At 906, the request is validated against a set of rules and policies. For example, host service control manager 402 validates the request against a set of rules and policies 404.
At 908, access to the service is granted to the client if the client is permitted to access the service based on the set of security rules and policies. For example, host service control manager 402 grants access to the service to the client if the client is permitted to access the service based on the set of security rules and policies 404. Note that in some implementations, the service provider access may be maintained over a period of time, and in some cases, the service provider access may be granted on a per-transaction basis. Some implementations may combine the two depending on a set of policy, such as the identity of the client runtime environment 308, type of client stub 306, type of service endpoint 502 and so forth.
At 910, if a service provider of the service is available, connection information is returned to the client. The service provider of the service is implemented in a service runtime environment of a second container. For example, if service provider 302 is available, the host service control manager 402 returns connection information to the client. The service provider 302 of the client is implemented in a service runtime environment 304 of a container 305 that is separate from container 310 of the client runtime environment 308.
Alternately, if the service provider of the service is not available, then at 912 a new instance of the service provider is started in a new service runtime environment and connection information is returned to the client. For example, if the service provider is not available, the host service control manager 402 starts a new instance of the service provider 302 in a new service runtime environment and connection information is returned to the client.
Example System
Although particular functionality is discussed herein with reference to particular modules, it should be noted that the functionality of individual modules discussed herein can be separated into multiple modules, and/or at least some functionality of multiple modules can be combined into a single module. Additionally, a particular module discussed herein as performing an action includes that particular module itself performing the action, or alternatively that particular module invoking or otherwise accessing another component or module that performs the action (or performs the action in conjunction with that particular module). Thus, a particular module performing an action includes that particular module itself performing the action and/or another module invoked or otherwise accessed by that particular module performing the action.
The example computing device 1002 as illustrated includes a processing system 1004, one or more computer-readable media 1006, and one or more I/O Interfaces 1008 that are communicatively coupled, one to another. Although not shown, the computing device 1002 may further include a system bus or other data and command transfer system that couples the various components, one to another. A system bus can include any one or combination of different bus structures, such as a memory bus or memory controller, a peripheral bus, a universal serial bus, and/or a processor or local bus that utilizes any of a variety of bus architectures. A variety of other examples are also contemplated, such as control and data lines.
The processing system 1004 is representative of functionality to perform one or more operations using hardware. Accordingly, the processing system 1004 is illustrated as including hardware elements 1010 that may be configured as processors, functional blocks, and so forth. This may include implementation in hardware as an application specific integrated circuit or other logic device formed using one or more semiconductors. The hardware elements 1010 are not limited by the materials from which they are formed or the processing mechanisms employed therein. For example, processors may be comprised of semiconductor(s) and/or transistors (e.g., electronic integrated circuits (ICs)). In such a context, processor-executable instructions may be electronically-executable instructions.
The computer-readable media 1006 is illustrated as including memory/storage 1012. The memory/storage 1012 represents memory/storage capacity associated with one or more computer-readable media. The memory/storage 1012 may include volatile media (such as random access memory (RAM)) and/or nonvolatile media (such as read only memory (ROM), resistive RAM (ReRAM), Flash memory, optical disks, magnetic disks, and so forth). The memory/storage 1012 may include fixed media (e.g., RAM, ROM, a fixed hard drive, and so on) as well as removable media (e.g., Flash memory, a removable hard drive, an optical disc, and so forth). The computer-readable media 1006 may be configured in a variety of other ways as further described below.
The one or more input/output interface(s) 1008 are representative of functionality to allow a user to enter commands and information to computing device 1002, and also allow information to be presented to the user and/or other components or devices using various input/output devices. Examples of input devices include a keyboard, a cursor control device (e.g., a mouse), a microphone (e.g., for voice inputs), a scanner, touch functionality (e.g., capacitive or other sensors that are configured to detect physical touch), a camera (e.g., which may employ visible or non-visible wavelengths such as infrared frequencies to detect movement that does not involve touch as gestures), a sensor (e.g. an ambient light sensor or a motion sensor), and so forth. Examples of output devices include a display device (e.g., a monitor or projector), speakers, a printer, a network card, tactile-response device, and so forth. Thus, the computing device 1002 may be configured in a variety of ways as further described below to support user interaction.
The computing device 1002 also includes a host operating system 1014. The host operating system 1014 provides various management of hardware-based virtualized security isolation, as discussed above. The host operating system 1014 can implement, for example, the host operating system 102 of
Various techniques may be described herein in the general context of software, hardware elements, or program modules. Generally, such modules include routines, programs, objects, elements, components, data structures, and so forth that perform particular tasks or implement particular abstract data types. The terms “module,” “functionality,” and “component” as used herein generally represent software, firmware, hardware, or a combination thereof. The features of the techniques described herein are platform-independent, meaning that the techniques may be implemented on a variety of computing platforms having a variety of processors.
An implementation of the described modules and techniques may be stored on or transmitted across some form of computer-readable media. The computer-readable media may include a variety of media that may be accessed by the computing device 1002. By way of example, and not limitation, computer-readable media may include “computer-readable storage media” and “computer-readable signal media.”
“Computer-readable storage media” refers to media and/or devices that enable persistent storage of information and/or storage that is tangible, in contrast to mere signal transmission, carrier waves, or signals per se. Thus, computer-readable storage media refers to non-signal bearing media. The computer-readable storage media includes hardware such as volatile and non-volatile, removable and non-removable media and/or storage devices implemented in a method or technology suitable for storage of information such as computer readable instructions, data structures, program modules, logic elements/circuits, or other data. Examples of computer-readable storage media may include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical storage, hard disks, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or other storage device, tangible media, or article of manufacture suitable to store the desired information and which may be accessed by a computer.
“Computer-readable signal media” refers to a signal-bearing medium that is configured to transmit instructions to the hardware of the computing device 1002, such as via a network. Signal media typically may embody computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as carrier waves, data signals, or other transport mechanism. Signal media also include any information delivery media. The term “modulated data signal” means a signal that has one or more of its characteristics set or changed in such a manner as to encode information in the signal. By way of example, and not limitation, communication media include wired media such as a wired network or direct-wired connection, and wireless media such as acoustic, RF, infrared, and other wireless media.
As previously described, the hardware elements 1010 and computer-readable media 1006 are representative of instructions, modules, programmable device logic and/or fixed device logic implemented in a hardware form that may be employed in some embodiments to implement at least some aspects of the techniques described herein. Hardware elements may include components of an integrated circuit or on-chip system, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a complex programmable logic device (CPLD), and other implementations in silicon or other hardware devices. In this context, a hardware element may operate as a processing device that performs program tasks defined by instructions, modules, and/or logic embodied by the hardware element as well as a hardware device utilized to store instructions for execution, e.g., the computer-readable storage media described previously.
Combinations of the foregoing may also be employed to implement various techniques and modules described herein. Accordingly, software, hardware, or program modules and other program modules may be implemented as one or more instructions and/or logic embodied on some form of computer-readable storage media and/or by one or more hardware elements 1010. The computing device 1002 may be configured to implement particular instructions and/or functions corresponding to the software and/or hardware modules. Accordingly, implementation of modules as a module that is executable by the computing device 1002 as software may be achieved at least partially in hardware, e.g., through use of computer-readable storage media and/or hardware elements 1010 of the processing system. The instructions and/or functions may be executable/operable by one or more articles of manufacture (for example, one or more computing devices 1002 and/or processing systems 1004) to implement techniques, modules, and examples described herein.
As further illustrated in
In the example system 1000, multiple devices are interconnected through a central computing device. The central computing device may be local to the multiple devices or may be located remotely from the multiple devices. In one or more embodiments, the central computing device may be a cloud of one or more server computers that are connected to the multiple devices through a network, the Internet, or other data communication link.
In one or more embodiments, this interconnection architecture enables functionality to be delivered across multiple devices to provide a common and seamless experience to a user of the multiple devices. Each of the multiple devices may have different physical requirements and capabilities, and the central computing device uses a platform to enable the delivery of an experience to the device that is both tailored to the device and yet common to all devices. In one or more embodiments, a class of target devices is created and experiences are tailored to the generic class of devices. A class of devices may be defined by physical features, types of usage, or other common characteristics of the devices.
In various implementations, the computing device 1002 may assume a variety of different configurations, such as for computer 1016, mobile 1018, and television 1020 uses. Each of these configurations includes devices that may have generally different constructs and capabilities, and thus the computing device 1002 may be configured according to one or more of the different device classes. For instance, the computing device 1002 may be implemented as the computer 1016 class of a device that includes a personal computer, desktop computer, a multi-screen computer, laptop computer, netbook, and so on.
The computing device 1002 may also be implemented as the mobile 1018 class of device that includes mobile devices, such as a mobile phone, portable music player, portable gaming device, a tablet computer, a multi-screen computer, and so on. The computing device 1002 may also be implemented as the television 1020 class of device that includes devices having or connected to generally larger screens in casual viewing environments. These devices include televisions, set-top boxes, gaming consoles, and so on.
The techniques described herein may be supported by these various configurations of the computing device 1002 and are not limited to the specific examples of the techniques described herein. This functionality may also be implemented all or in part through use of a distributed system, such as over a “cloud” 1022 via a platform 1024 as described below.
The cloud 1022 includes and/or is representative of a platform 1024 for resources 1026. The platform 1024 abstracts underlying functionality of hardware (e.g., servers) and software resources of the cloud 1022. The resources 1026 may include applications and/or data that can be utilized while computer processing is executed on servers that are remote from the computing device 1002. Resources 1026 can also include services provided over the Internet and/or through a subscriber network, such as a cellular or Wi-Fi network.
The platform 1024 may abstract resources and functions to connect the computing device 1002 with other computing devices. The platform 1024 may also serve to abstract scaling of resources to provide a corresponding level of scale to encountered demand for the resources 1026 that are implemented via the platform 1024. Accordingly, in an interconnected device embodiment, implementation of functionality described herein may be distributed throughout the system 1000. For example, the functionality may be implemented in part on the computing device 1002 as well as via the platform 1024 that abstracts the functionality of the cloud 1022. It should be noted that the cloud 1022 can be arranged in a myriad of configurations. For example, the cloud 1022 can be implemented as a single cloud, as multiple instances of cloud 1022 all behaving as a single cloud, or with one or more instances of platform 1024 implemented behind the cloud 1022 and behaving as if the one or more instances of platform 1024 were implemented in the cloud.
In the discussions herein, various different embodiments are described. It is to be appreciated and understood that each embodiment described herein can be used on its own or in connection with one or more other embodiments described herein.
Conclusion and Example Implementations
Example implementations described herein include, but are not limited to, one or any combinations of one or more of the following examples:
In one or more examples, a system for distributing access to services in a host operating system of a computing device comprises: a host operating system configured to implement a host runtime environment; one or more services implemented by the host operating system; and a service control manager configured to enable communication between a client stub of a service implemented in a client runtime environment and a service provider of the service that is implemented in a service runtime environment that is separate from the first client runtime environment.
An example as described alone or in combination with any of the other examples described above or below, wherein the client runtime environment is implemented in a first container and the service runtime environment is implemented in a second container that is separate from the first container.
An example as described alone or in combination with any of the other examples described above or below, wherein the service control manager is implemented in a third container that is separate from the first container and the second container.
An example as described alone or in combination with any of the other examples described above or below, wherein the client runtime environment is implemented in a first virtual machine and the service runtime environment is implemented in a second virtual machine that is separate from the first virtual machine.
An example as described alone or in combination with any of the other examples described above or below, wherein the service control manager is implemented in the host runtime environment.
An example as described alone or in combination with any of the other examples described above or below, wherein the service control manager is configured to allow or restrict access to the client stub based on a set of security rules and policies.
An example as described alone or in combination with any of the other examples described above or below, further comprising a service endpoint that is configured to identify the service control manager and associate the service control manager with the client stub.
An example as described alone or in combination with any of the other examples described above or below, wherein the service endpoint is discoverable by the client stub.
An example as described alone or in combination with any of the other examples described above or below, wherein the service control manager is configured to manage the service providers based on demand from clients and to terminate a particular service provider if there is no demand for the service provider.
An example as described alone or in combination with any of the other examples described above or below, wherein VPN is used to protect communications between the client stub and the service provider.
An example as described alone or in combination with any of the other examples described above or below, further comprising a client management service configured to: provide, in the host runtime environment, monitoring of service demand; in response to monitoring an increase in service demand, allocate resources to meet the service demand; and in response to monitoring a decrease in service demand, deallocate resources to meet the service demand.
An example as described alone or in combination with any of the other examples described above or below, wherein the client management service locally calculates a capacity model based on the monitoring of service demand.
In one or more examples, a computer-implemented method comprises: providing, in a host runtime environment, a service control manager configured to distribute and manage services across containers; receiving, at the service control manager, a request to access a service, the request received from a client stub of a client implemented in a client runtime environment of a first container; validating the request against a set of security rules and policies; granting, to the client, access to the service if the client is permitted to access the service based on the set of security rules and policies; if a service provider of the service is available, returning connection information to the client, the service provider of the service implemented in a service runtime environment of a second container that is separate from the first container; and if the service provider of the service is not available, starting a new instance of the service provider in a new service runtime environment and return connection information to the client.
An example as described alone or in combination with any of the other examples described above or below, wherein the service control manager is configured to allow or restrict access to the client based on the set of security rules and policies.
An example as described alone or in combination with any of the other examples described above or below, further comprising identifying, at a service endpoint, the service control manager, and associating the service control manager with the client stub.
An example as described alone or in combination with any of the other examples described above or below, wherein the service endpoint is discoverable by the client stub.
An example as described alone or in combination with any of the other examples described above or below, further comprising managing, by the service control manager, the service providers based on demand from clients.
An example as described alone or in combination with any of the other examples described above or below, further comprising terminating a particular service provider if there is no demand for the service provider.
An example as described alone or in combination with any of the other examples described above or below, further comprising using VPN to protect communications between the client stub and the service provider.
An example as described alone or in combination with any of the other examples described above or below, further comprising: providing, in the host runtime environment, monitoring of service demand; in response to monitoring an increase in service demand, allocating resources to meet the service demand; and in response to monitoring a decrease in service demand, deallocating resources to meet the service demand.
Although the example implementations have been described in language specific to structural features and/or methodological acts, it is to be understood that the implementations defined in the appended claims is not necessarily limited to the specific features or acts described. Rather, the specific features and acts are disclosed as example forms of implementing the claimed features.
This application claims priority under 35 U.S.C. Section 119(e) to U.S. Provisional Patent Application No. 62/444,209, filed Jan. 9, 2017 and titled “Distribution and Management of Services in Virtual Environments,” the entire disclosure of which is hereby incorporated by reference.
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